1 /* SPDX-License-Identifier: GPL-2.0 */
3 * This file contains the 64-bit "server" PowerPC variant
4 * of the low level exception handling including exception
5 * vectors, exception return, part of the slb and stab
6 * handling and other fixed offset specific things.
8 * This file is meant to be #included from head_64.S due to
9 * position dependent assembly.
11 * Most of this originates from head_64.S and thus has the same
16 #include <asm/hw_irq.h>
17 #include <asm/exception-64s.h>
18 #include <asm/ptrace.h>
19 #include <asm/cpuidle.h>
20 #include <asm/head-64.h>
21 #include <asm/feature-fixups.h>
24 /* PACA save area offsets (exgen, exmc, etc) */
37 .error "EX_SIZE is wrong"
41 * Following are fixed section helper macros.
43 * EXC_REAL_BEGIN/END - real, unrelocated exception vectors
44 * EXC_VIRT_BEGIN/END - virt (AIL), unrelocated exception vectors
45 * TRAMP_REAL_BEGIN - real, unrelocated helpers (virt may call these)
46 * TRAMP_VIRT_BEGIN - virt, unreloc helpers (in practice, real can use)
47 * EXC_COMMON - After switching to virtual, relocated mode.
50 #define EXC_REAL_BEGIN(name, start, size) \
51 FIXED_SECTION_ENTRY_BEGIN_LOCATION(real_vectors, exc_real_##start##_##name, start, size)
53 #define EXC_REAL_END(name, start, size) \
54 FIXED_SECTION_ENTRY_END_LOCATION(real_vectors, exc_real_##start##_##name, start, size)
56 #define EXC_VIRT_BEGIN(name, start, size) \
57 FIXED_SECTION_ENTRY_BEGIN_LOCATION(virt_vectors, exc_virt_##start##_##name, start, size)
59 #define EXC_VIRT_END(name, start, size) \
60 FIXED_SECTION_ENTRY_END_LOCATION(virt_vectors, exc_virt_##start##_##name, start, size)
62 #define EXC_COMMON_BEGIN(name) \
64 .balign IFETCH_ALIGN_BYTES; \
66 _ASM_NOKPROBE_SYMBOL(name); \
67 DEFINE_FIXED_SYMBOL(name); \
70 #define TRAMP_REAL_BEGIN(name) \
71 FIXED_SECTION_ENTRY_BEGIN(real_trampolines, name)
73 #define TRAMP_VIRT_BEGIN(name) \
74 FIXED_SECTION_ENTRY_BEGIN(virt_trampolines, name)
76 #define EXC_REAL_NONE(start, size) \
77 FIXED_SECTION_ENTRY_BEGIN_LOCATION(real_vectors, exc_real_##start##_##unused, start, size); \
78 FIXED_SECTION_ENTRY_END_LOCATION(real_vectors, exc_real_##start##_##unused, start, size)
80 #define EXC_VIRT_NONE(start, size) \
81 FIXED_SECTION_ENTRY_BEGIN_LOCATION(virt_vectors, exc_virt_##start##_##unused, start, size); \
82 FIXED_SECTION_ENTRY_END_LOCATION(virt_vectors, exc_virt_##start##_##unused, start, size)
85 * We're short on space and time in the exception prolog, so we can't
86 * use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
87 * Instead we get the base of the kernel from paca->kernelbase and or in the low
88 * part of label. This requires that the label be within 64KB of kernelbase, and
89 * that kernelbase be 64K aligned.
91 #define LOAD_HANDLER(reg, label) \
92 ld reg,PACAKBASE(r13); /* get high part of &label */ \
93 ori reg,reg,FIXED_SYMBOL_ABS_ADDR(label)
95 #define __LOAD_HANDLER(reg, label) \
96 ld reg,PACAKBASE(r13); \
97 ori reg,reg,(ABS_ADDR(label))@l
100 * Branches from unrelocated code (e.g., interrupts) to labels outside
101 * head-y require >64K offsets.
103 #define __LOAD_FAR_HANDLER(reg, label) \
104 ld reg,PACAKBASE(r13); \
105 ori reg,reg,(ABS_ADDR(label))@l; \
106 addis reg,reg,(ABS_ADDR(label))@h
109 * Branch to label using its 0xC000 address. This results in instruction
110 * address suitable for MSR[IR]=0 or 1, which allows relocation to be turned
111 * on using mtmsr rather than rfid.
113 * This could set the 0xc bits for !RELOCATABLE as an immediate, rather than
114 * load KBASE for a slight optimisation.
116 #define BRANCH_TO_C000(reg, label) \
117 __LOAD_FAR_HANDLER(reg, label); \
122 * Interrupt code generation macros
124 #define IVEC .L_IVEC_\name\() /* Interrupt vector address */
125 #define IHSRR .L_IHSRR_\name\() /* Sets SRR or HSRR registers */
126 #define IHSRR_IF_HVMODE .L_IHSRR_IF_HVMODE_\name\() /* HSRR if HV else SRR */
127 #define IAREA .L_IAREA_\name\() /* PACA save area */
128 #define IVIRT .L_IVIRT_\name\() /* Has virt mode entry point */
129 #define IISIDE .L_IISIDE_\name\() /* Uses SRR0/1 not DAR/DSISR */
130 #define IDAR .L_IDAR_\name\() /* Uses DAR (or SRR0) */
131 #define IDSISR .L_IDSISR_\name\() /* Uses DSISR (or SRR1) */
132 #define ISET_RI .L_ISET_RI_\name\() /* Run common code w/ MSR[RI]=1 */
133 #define IBRANCH_TO_COMMON .L_IBRANCH_TO_COMMON_\name\() /* ENTRY branch to common */
134 #define IREALMODE_COMMON .L_IREALMODE_COMMON_\name\() /* Common runs in realmode */
135 #define IMASK .L_IMASK_\name\() /* IRQ soft-mask bit */
136 #define IKVM_SKIP .L_IKVM_SKIP_\name\() /* Generate KVM skip handler */
137 #define IKVM_REAL .L_IKVM_REAL_\name\() /* Real entry tests KVM */
138 #define __IKVM_REAL(name) .L_IKVM_REAL_ ## name
139 #define IKVM_VIRT .L_IKVM_VIRT_\name\() /* Virt entry tests KVM */
140 #define ISTACK .L_ISTACK_\name\() /* Set regular kernel stack */
141 #define __ISTACK(name) .L_ISTACK_ ## name
142 #define IRECONCILE .L_IRECONCILE_\name\() /* Do RECONCILE_IRQ_STATE */
143 #define IKUAP .L_IKUAP_\name\() /* Do KUAP lock */
145 #define INT_DEFINE_BEGIN(n) \
146 .macro int_define_ ## n name
148 #define INT_DEFINE_END(n) \
150 int_define_ ## n n ; \
153 .macro do_define_int name
155 .error "IVEC not defined"
160 .ifndef IHSRR_IF_HVMODE
181 .ifndef IBRANCH_TO_COMMON
184 .ifndef IREALMODE_COMMON
187 .if ! IBRANCH_TO_COMMON
188 .error "IREALMODE_COMMON=1 but IBRANCH_TO_COMMON=0"
214 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
215 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
217 * All interrupts which set HSRR registers, as well as SRESET and MCE and
218 * syscall when invoked with "sc 1" switch to MSR[HV]=1 (HVMODE) to be taken,
219 * so they all generally need to test whether they were taken in guest context.
221 * Note: SRESET and MCE may also be sent to the guest by the hypervisor, and be
222 * taken with MSR[HV]=0.
224 * Interrupts which set SRR registers (with the above exceptions) do not
225 * elevate to MSR[HV]=1 mode, though most can be taken when running with
226 * MSR[HV]=1 (e.g., bare metal kernel and userspace). So these interrupts do
227 * not need to test whether a guest is running because they get delivered to
228 * the guest directly, including nested HV KVM guests.
230 * The exception is PR KVM, where the guest runs with MSR[PR]=1 and the host
231 * runs with MSR[HV]=0, so the host takes all interrupts on behalf of the
232 * guest. PR KVM runs with LPCR[AIL]=0 which causes interrupts to always be
233 * delivered to the real-mode entry point, therefore such interrupts only test
234 * KVM in their real mode handlers, and only when PR KVM is possible.
236 * Interrupts that are taken in MSR[HV]=0 and escalate to MSR[HV]=1 are always
237 * delivered in real-mode when the MMU is in hash mode because the MMU
238 * registers are not set appropriately to translate host addresses. In nested
239 * radix mode these can be delivered in virt-mode as the host translations are
240 * used implicitly (see: effective LPID, effective PID).
244 * If an interrupt is taken while a guest is running, it is immediately routed
245 * to KVM to handle. If both HV and PR KVM arepossible, KVM interrupts go first
246 * to kvmppc_interrupt_hv, which handles the PR guest case.
248 #define kvmppc_interrupt kvmppc_interrupt_hv
250 #define kvmppc_interrupt kvmppc_interrupt_pr
254 lbz r10,HSTATE_IN_GUEST(r13)
260 .balign IFETCH_ALIGN_BYTES
264 cmpwi r10,KVM_GUEST_MODE_SKIP
268 ld r10,IAREA+EX_CFAR(r13)
269 std r10,HSTATE_CFAR(r13)
270 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
273 ld r10,PACA_EXGEN+EX_CTR(r13)
276 ld r10,IAREA+EX_PPR(r13)
277 std r10,HSTATE_PPR(r13)
278 END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
279 ld r11,IAREA+EX_R11(r13)
280 ld r12,IAREA+EX_R12(r13)
281 std r12,HSTATE_SCRATCH0(r13)
283 ld r9,IAREA+EX_R9(r13)
284 ld r10,IAREA+EX_R10(r13)
285 /* HSRR variants have the 0x2 bit added to their trap number */
288 ori r12,r12,(IVEC + 0x2)
291 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
293 ori r12,r12,(IVEC+ 0x2)
301 ld r10,PACA_EXGEN+EX_CTR(r13)
303 ld r9,IAREA+EX_R9(r13)
304 ld r10,IAREA+EX_R10(r13)
305 ld r11,IAREA+EX_R11(r13)
306 ld r12,IAREA+EX_R12(r13)
309 b kvmppc_skip_Hinterrupt
311 b kvmppc_skip_interrupt
312 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
314 b kvmppc_skip_Hinterrupt
316 b kvmppc_skip_interrupt
329 * This is the BOOK3S interrupt entry code macro.
331 * This can result in one of several things happening:
332 * - Branch to the _common handler, relocated, in virtual mode.
333 * These are normal interrupts (synchronous and asynchronous) handled by
335 * - Branch to KVM, relocated but real mode interrupts remain in real mode.
336 * These occur when HSTATE_IN_GUEST is set. The interrupt may be caused by
337 * / intended for host or guest kernel, but KVM must always be involved
338 * because the machine state is set for guest execution.
339 * - Branch to the masked handler, unrelocated.
340 * These occur when maskable asynchronous interrupts are taken with the
342 * - Branch to an "early" handler in real mode but relocated.
343 * This is done if early=1. MCE and HMI use these to handle errors in real
345 * - Fall through and continue executing in real, unrelocated mode.
346 * This is done if early=2.
349 .macro GEN_BRANCH_TO_COMMON name, virt
351 LOAD_HANDLER(r10, \name\()_common)
356 #ifndef CONFIG_RELOCATABLE
357 b \name\()_common_virt
359 LOAD_HANDLER(r10, \name\()_common_virt)
364 LOAD_HANDLER(r10, \name\()_common_real)
371 .macro GEN_INT_ENTRY name, virt, ool=0
372 SET_SCRATCH0(r13) /* save r13 */
374 std r9,IAREA+EX_R9(r13) /* save r9 */
377 END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
379 std r10,IAREA+EX_R10(r13) /* save r10 - r12 */
382 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
387 TRAMP_REAL_BEGIN(tramp_real_\name)
391 TRAMP_VIRT_BEGIN(tramp_virt_\name)
396 std r9,IAREA+EX_PPR(r13)
397 END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
399 std r10,IAREA+EX_CFAR(r13)
400 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
403 std r10,IAREA+EX_CTR(r13)
405 std r11,IAREA+EX_R11(r13)
406 std r12,IAREA+EX_R12(r13)
409 * DAR/DSISR, SCRATCH0 must be read before setting MSR[RI],
410 * because a d-side MCE will clobber those registers so is
411 * not recoverable if they are live.
414 std r10,IAREA+EX_R13(r13)
421 std r10,IAREA+EX_DAR(r13)
423 .if IDSISR && !IISIDE
425 mfspr r10,SPRN_HDSISR
429 stw r10,IAREA+EX_DSISR(r13)
434 mfspr r11,SPRN_HSRR0 /* save HSRR0 */
435 mfspr r12,SPRN_HSRR1 /* and HSRR1 */
437 mfspr r11,SPRN_SRR0 /* save SRR0 */
438 mfspr r12,SPRN_SRR1 /* and SRR1 */
439 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
441 mfspr r11,SPRN_HSRR0 /* save HSRR0 */
442 mfspr r12,SPRN_HSRR1 /* and HSRR1 */
444 mfspr r11,SPRN_SRR0 /* save SRR0 */
445 mfspr r12,SPRN_SRR1 /* and SRR1 */
448 .if IBRANCH_TO_COMMON
449 GEN_BRANCH_TO_COMMON \name \virt
458 * __GEN_COMMON_ENTRY is required to receive the branch from interrupt
459 * entry, except in the case of the real-mode handlers which require
460 * __GEN_REALMODE_COMMON_ENTRY.
462 * This switches to virtual mode and sets MSR[RI].
464 .macro __GEN_COMMON_ENTRY name
465 DEFINE_FIXED_SYMBOL(\name\()_common_real)
466 \name\()_common_real:
471 ld r10,PACAKMSR(r13) /* get MSR value for kernel */
472 /* MSR[RI] is clear iff using SRR regs */
473 .if IHSRR == EXC_HV_OR_STD
476 END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE)
484 b 1f /* skip the virt test coming from real */
487 .balign IFETCH_ALIGN_BYTES
488 DEFINE_FIXED_SYMBOL(\name\()_common_virt)
489 \name\()_common_virt:
498 * Don't switch to virt mode. Used for early MCE and HMI handlers that
499 * want to run in real mode.
501 .macro __GEN_REALMODE_COMMON_ENTRY name
502 DEFINE_FIXED_SYMBOL(\name\()_common_real)
503 \name\()_common_real:
509 .macro __GEN_COMMON_BODY name
511 lbz r10,PACAIRQSOFTMASK(r13)
513 /* Associate vector numbers with bits in paca->irq_happened */
514 .if IVEC == 0x500 || IVEC == 0xea0
516 .elseif IVEC == 0x900
518 .elseif IVEC == 0xa00 || IVEC == 0xe80
519 li r10,PACA_IRQ_DBELL
520 .elseif IVEC == 0xe60
522 .elseif IVEC == 0xf00
525 .abort "Bad maskable vector"
530 bne masked_Hinterrupt
533 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
535 bne masked_Hinterrupt
542 andi. r10,r12,MSR_PR /* See if coming from user */
543 mr r10,r1 /* Save r1 */
544 subi r1,r1,INT_FRAME_SIZE /* alloc frame on kernel stack */
546 ld r1,PACAKSAVE(r13) /* kernel stack to use */
547 100: tdgei r1,-INT_FRAME_SIZE /* trap if r1 is in userspace */
548 EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,0
551 std r9,_CCR(r1) /* save CR in stackframe */
552 std r11,_NIP(r1) /* save SRR0 in stackframe */
553 std r12,_MSR(r1) /* save SRR1 in stackframe */
554 std r10,0(r1) /* make stack chain pointer */
555 std r0,GPR0(r1) /* save r0 in stackframe */
556 std r10,GPR1(r1) /* save r1 in stackframe */
560 mtmsrd r10,1 /* Set MSR_RI */
565 kuap_save_amr_and_lock r9, r10, cr1, cr0
567 beq 101f /* if from kernel mode */
568 ACCOUNT_CPU_USER_ENTRY(r13, r9, r10)
570 ld r9,IAREA+EX_PPR(r13) /* Read PPR from paca */
572 END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
576 kuap_save_amr_and_lock r9, r10, cr1
580 /* Save original regs values from save area to stack frame. */
581 ld r9,IAREA+EX_R9(r13) /* move r9, r10 to stackframe */
582 ld r10,IAREA+EX_R10(r13)
585 ld r9,IAREA+EX_R11(r13) /* move r11 - r13 to stackframe */
586 ld r10,IAREA+EX_R12(r13)
587 ld r11,IAREA+EX_R13(r13)
598 ld r10,IAREA+EX_DAR(r13)
606 lis r11,DSISR_SRR1_MATCH_64S@h
609 lwz r10,IAREA+EX_DSISR(r13)
615 ld r10,IAREA+EX_CFAR(r13)
616 std r10,ORIG_GPR3(r1)
617 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
618 ld r10,IAREA+EX_CTR(r13)
620 std r2,GPR2(r1) /* save r2 in stackframe */
621 SAVE_4GPRS(3, r1) /* save r3 - r6 in stackframe */
622 SAVE_2GPRS(7, r1) /* save r7, r8 in stackframe */
623 mflr r9 /* Get LR, later save to stack */
624 ld r2,PACATOC(r13) /* get kernel TOC into r2 */
626 lbz r10,PACAIRQSOFTMASK(r13)
627 mfspr r11,SPRN_XER /* save XER in stackframe */
631 std r9,_TRAP(r1) /* set trap number */
633 ld r11,exception_marker@toc(r2)
634 std r10,RESULT(r1) /* clear regs->result */
635 std r11,STACK_FRAME_OVERHEAD-16(r1) /* mark the frame */
642 RECONCILE_IRQ_STATE(r10, r11)
647 * On entry r13 points to the paca, r9-r13 are saved in the paca,
648 * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
649 * SRR1, and relocation is on.
651 * If stack=0, then the stack is already set in r1, and r1 is saved in r10.
652 * PPR save and CPU accounting is not done for the !stack case (XXX why not?)
654 .macro GEN_COMMON name
655 __GEN_COMMON_ENTRY \name
656 __GEN_COMMON_BODY \name
660 * Restore all registers including H/SRR0/1 saved in a stack frame of a
661 * standard exception.
663 .macro EXCEPTION_RESTORE_REGS hsrr=0
664 /* Move original SRR0 and SRR1 into the respective regs */
688 /* restore original r1. */
692 #define RUNLATCH_ON \
694 ld r3, PACA_THREAD_INFO(r13); \
695 ld r4,TI_LOCAL_FLAGS(r3); \
696 andi. r0,r4,_TLF_RUNLATCH; \
697 beql ppc64_runlatch_on_trampoline; \
698 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
701 * When the idle code in power4_idle puts the CPU into NAP mode,
702 * it has to do so in a loop, and relies on the external interrupt
703 * and decrementer interrupt entry code to get it out of the loop.
704 * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
705 * to signal that it is in the loop and needs help to get out.
707 #ifdef CONFIG_PPC_970_NAP
710 ld r11, PACA_THREAD_INFO(r13); \
711 ld r9,TI_LOCAL_FLAGS(r11); \
712 andi. r10,r9,_TLF_NAPPING; \
713 bnel power4_fixup_nap; \
714 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
720 * There are a few constraints to be concerned with.
721 * - Real mode exceptions code/data must be located at their physical location.
722 * - Virtual mode exceptions must be mapped at their 0xc000... location.
723 * - Fixed location code must not call directly beyond the __end_interrupts
724 * area when built with CONFIG_RELOCATABLE. LOAD_HANDLER / bctr sequence
726 * - LOAD_HANDLER targets must be within first 64K of physical 0 /
728 * - Conditional branch targets must be within +/-32K of caller.
730 * "Virtual exceptions" run with relocation on (MSR_IR=1, MSR_DR=1), and
731 * therefore don't have to run in physically located code or rfid to
732 * virtual mode kernel code. However on relocatable kernels they do have
733 * to branch to KERNELBASE offset because the rest of the kernel (outside
734 * the exception vectors) may be located elsewhere.
736 * Virtual exceptions correspond with physical, except their entry points
737 * are offset by 0xc000000000000000 and also tend to get an added 0x4000
738 * offset applied. Virtual exceptions are enabled with the Alternate
739 * Interrupt Location (AIL) bit set in the LPCR. However this does not
740 * guarantee they will be delivered virtually. Some conditions (see the ISA)
741 * cause exceptions to be delivered in real mode.
743 * It's impossible to receive interrupts below 0x300 via AIL.
745 * KVM: None of the virtual exceptions are from the guest. Anything that
746 * escalated to HV=1 from HV=0 is delivered via real mode handlers.
749 * We layout physical memory as follows:
750 * 0x0000 - 0x00ff : Secondary processor spin code
751 * 0x0100 - 0x18ff : Real mode pSeries interrupt vectors
752 * 0x1900 - 0x3fff : Real mode trampolines
753 * 0x4000 - 0x58ff : Relon (IR=1,DR=1) mode pSeries interrupt vectors
754 * 0x5900 - 0x6fff : Relon mode trampolines
755 * 0x7000 - 0x7fff : FWNMI data area
756 * 0x8000 - .... : Common interrupt handlers, remaining early
757 * setup code, rest of kernel.
759 * We could reclaim 0x4000-0x42ff for real mode trampolines if the space
760 * is necessary. Until then it's more consistent to explicitly put VIRT_NONE
763 OPEN_FIXED_SECTION(real_vectors, 0x0100, 0x1900)
764 OPEN_FIXED_SECTION(real_trampolines, 0x1900, 0x4000)
765 OPEN_FIXED_SECTION(virt_vectors, 0x4000, 0x5900)
766 OPEN_FIXED_SECTION(virt_trampolines, 0x5900, 0x7000)
768 #ifdef CONFIG_PPC_POWERNV
769 .globl start_real_trampolines
770 .globl end_real_trampolines
771 .globl start_virt_trampolines
772 .globl end_virt_trampolines
775 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
777 * Data area reserved for FWNMI option.
778 * This address (0x7000) is fixed by the RPA.
779 * pseries and powernv need to keep the whole page from
780 * 0x7000 to 0x8000 free for use by the firmware
782 ZERO_FIXED_SECTION(fwnmi_page, 0x7000, 0x8000)
783 OPEN_TEXT_SECTION(0x8000)
785 OPEN_TEXT_SECTION(0x7000)
788 USE_FIXED_SECTION(real_vectors)
791 * This is the start of the interrupt handlers for pSeries
792 * This code runs with relocation off.
793 * Code from here to __end_interrupts gets copied down to real
794 * address 0x100 when we are running a relocatable kernel.
795 * Therefore any relative branches in this section must only
796 * branch to labels in this section.
798 .globl __start_interrupts
801 /* No virt vectors corresponding with 0x0..0x100 */
802 EXC_VIRT_NONE(0x4000, 0x100)
806 * Interrupt 0x100 - System Reset Interrupt (SRESET aka NMI).
807 * This is a non-maskable, asynchronous interrupt always taken in real-mode.
809 * - Wake from power-saving state, on powernv.
810 * - An NMI from another CPU, triggered by firmware or hypercall.
811 * - As crash/debug signal injected from BMC, firmware or hypervisor.
814 * Power-save wakeup is the only performance critical path, so this is
815 * determined quickly as possible first. In this case volatile registers
816 * can be discarded and SPRs like CFAR don't need to be read.
818 * If not a powersave wakeup, then it's run as a regular interrupt, however
819 * it uses its own stack and PACA save area to preserve the regular kernel
820 * environment for debugging.
822 * This interrupt is not maskable, so triggering it when MSR[RI] is clear,
823 * or SCRATCH0 is in use, etc. may cause a crash. It's also not entirely
824 * correct to switch to virtual mode to run the regular interrupt handler
825 * because it might be interrupted when the MMU is in a bad state (e.g., SLB
829 * PAPR specifies a "fwnmi" facility which sends the sreset to a different
830 * entry point with a different register set up. Some hypervisors will
831 * send the sreset to 0x100 in the guest if it is not fwnmi capable.
834 * Unlike most SRR interrupts, this may be taken by the host while executing
835 * in a guest, so a KVM test is required. KVM will pull the CPU out of guest
836 * mode and then raise the sreset.
838 INT_DEFINE_BEGIN(system_reset)
841 IVIRT=0 /* no virt entry point */
843 * MSR_RI is not enabled, because PACA_EXNMI and nmi stack is
844 * being used, so a nested NMI exception would corrupt it.
850 INT_DEFINE_END(system_reset)
852 EXC_REAL_BEGIN(system_reset, 0x100, 0x100)
853 #ifdef CONFIG_PPC_P7_NAP
855 * If running native on arch 2.06 or later, check if we are waking up
856 * from nap/sleep/winkle, and branch to idle handler. This tests SRR1
857 * bits 46:47. A non-0 value indicates that we are coming from a power
858 * saving state. The idle wakeup handler initially runs in real mode,
859 * but we branch to the 0xc000... address so we can turn on relocation
860 * with mtmsrd later, after SPRs are restored.
862 * Careful to minimise cost for the fast path (idle wakeup) while
863 * also avoiding clobbering CFAR for the debug path (non-idle).
865 * For the idle wake case volatile registers can be clobbered, which
866 * is why we use those initially. If it turns out to not be an idle
867 * wake, carefully put everything back the way it was, so we can use
868 * common exception macros to handle it.
873 std r3,PACA_EXNMI+0*8(r13)
874 std r4,PACA_EXNMI+1*8(r13)
875 std r5,PACA_EXNMI+2*8(r13)
878 rlwinm. r5,r3,47-31,30,31
879 bne+ system_reset_idle_wake
880 /* Not powersave wakeup. Restore regs for regular interrupt handler. */
882 ld r3,PACA_EXNMI+0*8(r13)
883 ld r4,PACA_EXNMI+1*8(r13)
884 ld r5,PACA_EXNMI+2*8(r13)
886 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
889 GEN_INT_ENTRY system_reset, virt=0
891 * In theory, we should not enable relocation here if it was disabled
892 * in SRR1, because the MMU may not be configured to support it (e.g.,
893 * SLB may have been cleared). In practice, there should only be a few
894 * small windows where that's the case, and sreset is considered to
895 * be dangerous anyway.
897 EXC_REAL_END(system_reset, 0x100, 0x100)
898 EXC_VIRT_NONE(0x4100, 0x100)
900 #ifdef CONFIG_PPC_P7_NAP
901 TRAMP_REAL_BEGIN(system_reset_idle_wake)
902 /* We are waking up from idle, so may clobber any volatile register */
904 bltlr cr1 /* no state loss, return to idle caller with r3=SRR1 */
905 BRANCH_TO_C000(r12, DOTSYM(idle_return_gpr_loss))
908 #ifdef CONFIG_PPC_PSERIES
910 * Vectors for the FWNMI option. Share common code.
912 TRAMP_REAL_BEGIN(system_reset_fwnmi)
913 /* XXX: fwnmi guest could run a nested/PR guest, so why no test? */
914 __IKVM_REAL(system_reset)=0
915 GEN_INT_ENTRY system_reset, virt=0
917 #endif /* CONFIG_PPC_PSERIES */
919 EXC_COMMON_BEGIN(system_reset_common)
920 __GEN_COMMON_ENTRY system_reset
922 * Increment paca->in_nmi then enable MSR_RI. SLB or MCE will be able
923 * to recover, but nested NMI will notice in_nmi and not recover
924 * because of the use of the NMI stack. in_nmi reentrancy is tested in
925 * system_reset_exception.
927 lhz r10,PACA_IN_NMI(r13)
929 sth r10,PACA_IN_NMI(r13)
934 ld r1,PACA_NMI_EMERG_SP(r13)
935 subi r1,r1,INT_FRAME_SIZE
936 __GEN_COMMON_BODY system_reset
938 * Set IRQS_ALL_DISABLED unconditionally so irqs_disabled() does
939 * the right thing. We do not want to reconcile because that goes
940 * through irq tracing which we don't want in NMI.
942 * Save PACAIRQHAPPENED to _DAR (otherwise unused), and set HARD_DIS
943 * as we are running with MSR[EE]=0.
945 li r10,IRQS_ALL_DISABLED
946 stb r10,PACAIRQSOFTMASK(r13)
947 lbz r10,PACAIRQHAPPENED(r13)
949 ori r10,r10,PACA_IRQ_HARD_DIS
950 stb r10,PACAIRQHAPPENED(r13)
952 addi r3,r1,STACK_FRAME_OVERHEAD
953 bl system_reset_exception
955 /* Clear MSR_RI before setting SRR0 and SRR1. */
960 * MSR_RI is clear, now we can decrement paca->in_nmi.
962 lhz r10,PACA_IN_NMI(r13)
964 sth r10,PACA_IN_NMI(r13)
967 * Restore soft mask settings.
970 stb r10,PACAIRQHAPPENED(r13)
972 stb r10,PACAIRQSOFTMASK(r13)
975 EXCEPTION_RESTORE_REGS
976 RFI_TO_USER_OR_KERNEL
982 * Interrupt 0x200 - Machine Check Interrupt (MCE).
983 * This is a non-maskable interrupt always taken in real-mode. It can be
984 * synchronous or asynchronous, caused by hardware or software, and it may be
985 * taken in a power-saving state.
988 * Similarly to system reset, this uses its own stack and PACA save area,
989 * the difference is re-entrancy is allowed on the machine check stack.
991 * machine_check_early is run in real mode, and carefully decodes the
992 * machine check and tries to handle it (e.g., flush the SLB if there was an
993 * error detected there), determines if it was recoverable and logs the
996 * This early code does not "reconcile" irq soft-mask state like SRESET or
997 * regular interrupts do, so irqs_disabled() among other things may not work
998 * properly (irq disable/enable already doesn't work because irq tracing can
999 * not work in real mode).
1001 * Then, depending on the execution context when the interrupt is taken, there
1002 * are 3 main actions:
1003 * - Executing in kernel mode. The event is queued with irq_work, which means
1004 * it is handled when it is next safe to do so (i.e., the kernel has enabled
1005 * interrupts), which could be immediately when the interrupt returns. This
1006 * avoids nasty issues like switching to virtual mode when the MMU is in a
1007 * bad state, or when executing OPAL code. (SRESET is exposed to such issues,
1008 * but it has different priorities). Check to see if the CPU was in power
1009 * save, and return via the wake up code if it was.
1011 * - Executing in user mode. machine_check_exception is run like a normal
1012 * interrupt handler, which processes the data generated by the early handler.
1014 * - Executing in guest mode. The interrupt is run with its KVM test, and
1015 * branches to KVM to deal with. KVM may queue the event for the host
1018 * This interrupt is not maskable, so if it triggers when MSR[RI] is clear,
1019 * or SCRATCH0 is in use, it may cause a crash.
1024 INT_DEFINE_BEGIN(machine_check_early)
1027 IVIRT=0 /* no virt entry point */
1030 * MSR_RI is not enabled, because PACA_EXMC is being used, so a
1031 * nested machine check corrupts it. machine_check_common enables
1039 IKUAP=0 /* We don't touch AMR here, we never go to virtual mode */
1040 INT_DEFINE_END(machine_check_early)
1042 INT_DEFINE_BEGIN(machine_check)
1045 IVIRT=0 /* no virt entry point */
1051 INT_DEFINE_END(machine_check)
1053 EXC_REAL_BEGIN(machine_check, 0x200, 0x100)
1054 GEN_INT_ENTRY machine_check_early, virt=0
1055 EXC_REAL_END(machine_check, 0x200, 0x100)
1056 EXC_VIRT_NONE(0x4200, 0x100)
1058 #ifdef CONFIG_PPC_PSERIES
1059 TRAMP_REAL_BEGIN(machine_check_fwnmi)
1060 /* See comment at machine_check exception, don't turn on RI */
1061 GEN_INT_ENTRY machine_check_early, virt=0
1064 #define MACHINE_CHECK_HANDLER_WINDUP \
1065 /* Clear MSR_RI before setting SRR0 and SRR1. */\
1067 mtmsrd r9,1; /* Clear MSR_RI */ \
1068 /* Decrement paca->in_mce now RI is clear. */ \
1069 lhz r12,PACA_IN_MCE(r13); \
1071 sth r12,PACA_IN_MCE(r13); \
1072 EXCEPTION_RESTORE_REGS
1074 EXC_COMMON_BEGIN(machine_check_early_common)
1075 __GEN_REALMODE_COMMON_ENTRY machine_check_early
1078 * Switch to mc_emergency stack and handle re-entrancy (we limit
1079 * the nested MCE upto level 4 to avoid stack overflow).
1080 * Save MCE registers srr1, srr0, dar and dsisr and then set ME=1
1082 * We use paca->in_mce to check whether this is the first entry or
1083 * nested machine check. We increment paca->in_mce to track nested
1086 * If this is the first entry then set stack pointer to
1087 * paca->mc_emergency_sp, otherwise r1 is already pointing to
1088 * stack frame on mc_emergency stack.
1090 * NOTE: We are here with MSR_ME=0 (off), which means we risk a
1091 * checkstop if we get another machine check exception before we do
1092 * rfid with MSR_ME=1.
1094 * This interrupt can wake directly from idle. If that is the case,
1095 * the machine check is handled then the idle wakeup code is called
1098 lhz r10,PACA_IN_MCE(r13)
1099 cmpwi r10,0 /* Are we in nested machine check */
1100 cmpwi cr1,r10,MAX_MCE_DEPTH /* Are we at maximum nesting */
1101 addi r10,r10,1 /* increment paca->in_mce */
1102 sth r10,PACA_IN_MCE(r13)
1104 mr r10,r1 /* Save r1 */
1106 /* First machine check entry */
1107 ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */
1108 1: /* Limit nested MCE to level 4 to avoid stack overflow */
1109 bgt cr1,unrecoverable_mce /* Check if we hit limit of 4 */
1110 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
1112 __GEN_COMMON_BODY machine_check_early
1115 bl enable_machine_check
1116 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
1120 addi r3,r1,STACK_FRAME_OVERHEAD
1121 bl machine_check_early
1122 std r3,RESULT(r1) /* Save result */
1125 #ifdef CONFIG_PPC_P7_NAP
1127 * Check if thread was in power saving mode. We come here when any
1128 * of the following is true:
1129 * a. thread wasn't in power saving mode
1130 * b. thread was in power saving mode with no state loss,
1131 * supervisor state loss or hypervisor state loss.
1133 * Go back to nap/sleep/winkle mode again if (b) is true.
1136 rlwinm. r11,r12,47-31,30,31
1137 bne machine_check_idle_common
1138 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
1141 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
1143 * Check if we are coming from guest. If yes, then run the normal
1144 * exception handler which will take the
1145 * machine_check_kvm->kvmppc_interrupt branch to deliver the MC event
1148 lbz r11,HSTATE_IN_GUEST(r13)
1149 cmpwi r11,0 /* Check if coming from guest */
1150 bne mce_deliver /* continue if we are. */
1154 * Check if we are coming from userspace. If yes, then run the normal
1155 * exception handler which will deliver the MC event to this kernel.
1157 andi. r11,r12,MSR_PR /* See if coming from user. */
1158 bne mce_deliver /* continue in V mode if we are. */
1161 * At this point we are coming from kernel context.
1162 * Queue up the MCE event and return from the interrupt.
1163 * But before that, check if this is an un-recoverable exception.
1164 * If yes, then stay on emergency stack and panic.
1166 andi. r11,r12,MSR_RI
1167 beq unrecoverable_mce
1170 * Check if we have successfully handled/recovered from error, if not
1171 * then stay on emergency stack and panic.
1173 ld r3,RESULT(r1) /* Load result */
1174 cmpdi r3,0 /* see if we handled MCE successfully */
1175 beq unrecoverable_mce /* if !handled then panic */
1178 * Return from MC interrupt.
1179 * Queue up the MCE event so that we can log it later, while
1180 * returning from kernel or opal call.
1182 bl machine_check_queue_event
1183 MACHINE_CHECK_HANDLER_WINDUP
1188 * This is a host user or guest MCE. Restore all registers, then
1189 * run the "late" handler. For host user, this will run the
1190 * machine_check_exception handler in virtual mode like a normal
1191 * interrupt handler. For guest, this will trigger the KVM test
1192 * and branch to the KVM interrupt similarly to other interrupts.
1195 ld r10,ORIG_GPR3(r1)
1197 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
1198 MACHINE_CHECK_HANDLER_WINDUP
1199 GEN_INT_ENTRY machine_check, virt=0
1201 EXC_COMMON_BEGIN(machine_check_common)
1203 * Machine check is different because we use a different
1204 * save area: PACA_EXMC instead of PACA_EXGEN.
1206 GEN_COMMON machine_check
1209 /* Enable MSR_RI when finished with PACA_EXMC */
1212 addi r3,r1,STACK_FRAME_OVERHEAD
1213 bl machine_check_exception
1216 GEN_KVM machine_check
1219 #ifdef CONFIG_PPC_P7_NAP
1221 * This is an idle wakeup. Low level machine check has already been
1222 * done. Queue the event then call the idle code to do the wake up.
1224 EXC_COMMON_BEGIN(machine_check_idle_common)
1225 bl machine_check_queue_event
1228 * We have not used any non-volatile GPRs here, and as a rule
1229 * most exception code including machine check does not.
1230 * Therefore PACA_NAPSTATELOST does not need to be set. Idle
1231 * wakeup will restore volatile registers.
1233 * Load the original SRR1 into r3 for pnv_powersave_wakeup_mce.
1235 * Then decrement MCE nesting after finishing with the stack.
1240 lhz r11,PACA_IN_MCE(r13)
1242 sth r11,PACA_IN_MCE(r13)
1245 rlwinm r10,r3,47-31,30,31
1247 bltlr cr1 /* no state loss, return to idle caller */
1248 b idle_return_gpr_loss
1251 EXC_COMMON_BEGIN(unrecoverable_mce)
1253 * We are going down. But there are chances that we might get hit by
1254 * another MCE during panic path and we may run into unstable state
1255 * with no way out. Hence, turn ME bit off while going down, so that
1256 * when another MCE is hit during panic path, system will checkstop
1257 * and hypervisor will get restarted cleanly by SP.
1260 li r10,0 /* clear MSR_RI */
1262 bl disable_machine_check
1263 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
1264 ld r10,PACAKMSR(r13)
1269 /* Invoke machine_check_exception to print MCE event and panic. */
1270 addi r3,r1,STACK_FRAME_OVERHEAD
1271 bl machine_check_exception
1274 * We will not reach here. Even if we did, there is no way out.
1275 * Call unrecoverable_exception and die.
1277 addi r3,r1,STACK_FRAME_OVERHEAD
1278 bl unrecoverable_exception
1283 * Interrupt 0x300 - Data Storage Interrupt (DSI).
1284 * This is a synchronous interrupt generated due to a data access exception,
1285 * e.g., a load orstore which does not have a valid page table entry with
1286 * permissions. DAWR matches also fault here, as do RC updates, and minor misc
1287 * errors e.g., copy/paste, AMO, certain invalid CI accesses, etc.
1291 * Go to do_hash_page first to see if the HPT can be filled from an entry in
1292 * the Linux page table. Hash faults can hit in kernel mode in a fairly
1293 * arbitrary state (e.g., interrupts disabled, locks held) when accessing
1294 * "non-bolted" regions, e.g., vmalloc space. However these should always be
1295 * backed by Linux page tables.
1297 * If none is found, do a Linux page fault. Linux page faults can happen in
1298 * kernel mode due to user copy operations of course.
1301 * The hardware loads from the Linux page table directly, so a fault goes
1302 * immediately to Linux page fault.
1304 * Conditions like DAWR match are handled on the way in to Linux page fault.
1306 INT_DEFINE_BEGIN(data_access)
1310 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1314 INT_DEFINE_END(data_access)
1316 EXC_REAL_BEGIN(data_access, 0x300, 0x80)
1317 GEN_INT_ENTRY data_access, virt=0
1318 EXC_REAL_END(data_access, 0x300, 0x80)
1319 EXC_VIRT_BEGIN(data_access, 0x4300, 0x80)
1320 GEN_INT_ENTRY data_access, virt=1
1321 EXC_VIRT_END(data_access, 0x4300, 0x80)
1322 EXC_COMMON_BEGIN(data_access_common)
1323 GEN_COMMON data_access
1326 BEGIN_MMU_FTR_SECTION
1329 b do_hash_page /* Try to handle as hpte fault */
1330 MMU_FTR_SECTION_ELSE
1332 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
1338 * Interrupt 0x380 - Data Segment Interrupt (DSLB).
1339 * This is a synchronous interrupt in response to an MMU fault missing SLB
1340 * entry for HPT, or an address outside RPT translation range.
1344 * This refills the SLB, or reports an access fault similarly to a bad page
1345 * fault. When coming from user-mode, the SLB handler may access any kernel
1346 * data, though it may itself take a DSLB. When coming from kernel mode,
1347 * recursive faults must be avoided so access is restricted to the kernel
1348 * image text/data, kernel stack, and any data allocated below
1349 * ppc64_bolted_size (first segment). The kernel handler must avoid stomping
1350 * on user-handler data structures.
1352 * A dedicated save area EXSLB is used (XXX: but it actually need not be
1353 * these days, we could use EXGEN).
1355 INT_DEFINE_BEGIN(data_access_slb)
1360 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1364 INT_DEFINE_END(data_access_slb)
1366 EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80)
1367 GEN_INT_ENTRY data_access_slb, virt=0
1368 EXC_REAL_END(data_access_slb, 0x380, 0x80)
1369 EXC_VIRT_BEGIN(data_access_slb, 0x4380, 0x80)
1370 GEN_INT_ENTRY data_access_slb, virt=1
1371 EXC_VIRT_END(data_access_slb, 0x4380, 0x80)
1372 EXC_COMMON_BEGIN(data_access_slb_common)
1373 GEN_COMMON data_access_slb
1375 addi r3,r1,STACK_FRAME_OVERHEAD
1376 BEGIN_MMU_FTR_SECTION
1377 /* HPT case, do SLB fault */
1381 b fast_interrupt_return
1383 MMU_FTR_SECTION_ELSE
1384 /* Radix case, access is outside page table range */
1386 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
1388 RECONCILE_IRQ_STATE(r10, r11)
1391 addi r3,r1,STACK_FRAME_OVERHEAD
1395 GEN_KVM data_access_slb
1399 * Interrupt 0x400 - Instruction Storage Interrupt (ISI).
1400 * This is a synchronous interrupt in response to an MMU fault due to an
1401 * instruction fetch.
1404 * Similar to DSI, though in response to fetch. The faulting address is found
1405 * in SRR0 (rather than DAR), and status in SRR1 (rather than DSISR).
1407 INT_DEFINE_BEGIN(instruction_access)
1412 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1415 INT_DEFINE_END(instruction_access)
1417 EXC_REAL_BEGIN(instruction_access, 0x400, 0x80)
1418 GEN_INT_ENTRY instruction_access, virt=0
1419 EXC_REAL_END(instruction_access, 0x400, 0x80)
1420 EXC_VIRT_BEGIN(instruction_access, 0x4400, 0x80)
1421 GEN_INT_ENTRY instruction_access, virt=1
1422 EXC_VIRT_END(instruction_access, 0x4400, 0x80)
1423 EXC_COMMON_BEGIN(instruction_access_common)
1424 GEN_COMMON instruction_access
1427 BEGIN_MMU_FTR_SECTION
1430 b do_hash_page /* Try to handle as hpte fault */
1431 MMU_FTR_SECTION_ELSE
1433 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
1435 GEN_KVM instruction_access
1439 * Interrupt 0x480 - Instruction Segment Interrupt (ISLB).
1440 * This is a synchronous interrupt in response to an MMU fault due to an
1441 * instruction fetch.
1444 * Similar to DSLB, though in response to fetch. The faulting address is found
1445 * in SRR0 (rather than DAR).
1447 INT_DEFINE_BEGIN(instruction_access_slb)
1453 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1456 INT_DEFINE_END(instruction_access_slb)
1458 EXC_REAL_BEGIN(instruction_access_slb, 0x480, 0x80)
1459 GEN_INT_ENTRY instruction_access_slb, virt=0
1460 EXC_REAL_END(instruction_access_slb, 0x480, 0x80)
1461 EXC_VIRT_BEGIN(instruction_access_slb, 0x4480, 0x80)
1462 GEN_INT_ENTRY instruction_access_slb, virt=1
1463 EXC_VIRT_END(instruction_access_slb, 0x4480, 0x80)
1464 EXC_COMMON_BEGIN(instruction_access_slb_common)
1465 GEN_COMMON instruction_access_slb
1467 addi r3,r1,STACK_FRAME_OVERHEAD
1468 BEGIN_MMU_FTR_SECTION
1469 /* HPT case, do SLB fault */
1473 b fast_interrupt_return
1475 MMU_FTR_SECTION_ELSE
1476 /* Radix case, access is outside page table range */
1478 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
1480 RECONCILE_IRQ_STATE(r10, r11)
1483 addi r3,r1,STACK_FRAME_OVERHEAD
1487 GEN_KVM instruction_access_slb
1491 * Interrupt 0x500 - External Interrupt.
1492 * This is an asynchronous maskable interrupt in response to an "external
1493 * exception" from the interrupt controller or hypervisor (e.g., device
1494 * interrupt). It is maskable in hardware by clearing MSR[EE], and
1495 * soft-maskable with IRQS_DISABLED mask (i.e., local_irq_disable()).
1497 * When running in HV mode, Linux sets up the LPCR[LPES] bit such that
1498 * interrupts are delivered with HSRR registers, guests use SRRs, which
1499 * reqiures IHSRR_IF_HVMODE.
1501 * On bare metal POWER9 and later, Linux sets the LPCR[HVICE] bit such that
1502 * external interrupts are delivered as Hypervisor Virtualization Interrupts
1503 * rather than External Interrupts.
1506 * This calls into Linux IRQ handler. NVGPRs are not saved to reduce overhead,
1507 * because registers at the time of the interrupt are not so important as it is
1510 * If soft masked, the masked handler will note the pending interrupt for
1511 * replay, and clear MSR[EE] in the interrupted context.
1513 INT_DEFINE_BEGIN(hardware_interrupt)
1519 INT_DEFINE_END(hardware_interrupt)
1521 EXC_REAL_BEGIN(hardware_interrupt, 0x500, 0x100)
1522 GEN_INT_ENTRY hardware_interrupt, virt=0
1523 EXC_REAL_END(hardware_interrupt, 0x500, 0x100)
1524 EXC_VIRT_BEGIN(hardware_interrupt, 0x4500, 0x100)
1525 GEN_INT_ENTRY hardware_interrupt, virt=1
1526 EXC_VIRT_END(hardware_interrupt, 0x4500, 0x100)
1527 EXC_COMMON_BEGIN(hardware_interrupt_common)
1528 GEN_COMMON hardware_interrupt
1531 addi r3,r1,STACK_FRAME_OVERHEAD
1535 GEN_KVM hardware_interrupt
1539 * Interrupt 0x600 - Alignment Interrupt
1540 * This is a synchronous interrupt in response to data alignment fault.
1542 INT_DEFINE_BEGIN(alignment)
1546 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1549 INT_DEFINE_END(alignment)
1551 EXC_REAL_BEGIN(alignment, 0x600, 0x100)
1552 GEN_INT_ENTRY alignment, virt=0
1553 EXC_REAL_END(alignment, 0x600, 0x100)
1554 EXC_VIRT_BEGIN(alignment, 0x4600, 0x100)
1555 GEN_INT_ENTRY alignment, virt=1
1556 EXC_VIRT_END(alignment, 0x4600, 0x100)
1557 EXC_COMMON_BEGIN(alignment_common)
1558 GEN_COMMON alignment
1559 addi r3,r1,STACK_FRAME_OVERHEAD
1560 bl alignment_exception
1561 REST_NVGPRS(r1) /* instruction emulation may change GPRs */
1568 * Interrupt 0x700 - Program Interrupt (program check).
1569 * This is a synchronous interrupt in response to various instruction faults:
1570 * traps, privilege errors, TM errors, floating point exceptions.
1573 * This interrupt may use the "emergency stack" in some cases when being taken
1574 * from kernel context, which complicates handling.
1576 INT_DEFINE_BEGIN(program_check)
1578 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1581 INT_DEFINE_END(program_check)
1583 EXC_REAL_BEGIN(program_check, 0x700, 0x100)
1584 GEN_INT_ENTRY program_check, virt=0
1585 EXC_REAL_END(program_check, 0x700, 0x100)
1586 EXC_VIRT_BEGIN(program_check, 0x4700, 0x100)
1587 GEN_INT_ENTRY program_check, virt=1
1588 EXC_VIRT_END(program_check, 0x4700, 0x100)
1589 EXC_COMMON_BEGIN(program_check_common)
1590 __GEN_COMMON_ENTRY program_check
1593 * It's possible to receive a TM Bad Thing type program check with
1594 * userspace register values (in particular r1), but with SRR1 reporting
1595 * that we came from the kernel. Normally that would confuse the bad
1596 * stack logic, and we would report a bad kernel stack pointer. Instead
1597 * we switch to the emergency stack if we're taking a TM Bad Thing from
1601 andi. r10,r12,MSR_PR
1602 bne 2f /* If userspace, go normal path */
1604 andis. r10,r12,(SRR1_PROGTM)@h
1605 bne 1f /* If TM, emergency */
1607 cmpdi r1,-INT_FRAME_SIZE /* check if r1 is in userspace */
1608 blt 2f /* normal path if not */
1610 /* Use the emergency stack */
1611 1: andi. r10,r12,MSR_PR /* Set CR0 correctly for label */
1612 /* 3 in EXCEPTION_PROLOG_COMMON */
1613 mr r10,r1 /* Save r1 */
1614 ld r1,PACAEMERGSP(r13) /* Use emergency stack */
1615 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
1616 __ISTACK(program_check)=0
1617 __GEN_COMMON_BODY program_check
1620 __ISTACK(program_check)=1
1621 __GEN_COMMON_BODY program_check
1623 addi r3,r1,STACK_FRAME_OVERHEAD
1624 bl program_check_exception
1625 REST_NVGPRS(r1) /* instruction emulation may change GPRs */
1628 GEN_KVM program_check
1632 * Interrupt 0x800 - Floating-Point Unavailable Interrupt.
1633 * This is a synchronous interrupt in response to executing an fp instruction
1637 * This will load FP registers and enable the FP bit if coming from userspace,
1638 * otherwise report a bad kernel use of FP.
1640 INT_DEFINE_BEGIN(fp_unavailable)
1643 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1646 INT_DEFINE_END(fp_unavailable)
1648 EXC_REAL_BEGIN(fp_unavailable, 0x800, 0x100)
1649 GEN_INT_ENTRY fp_unavailable, virt=0
1650 EXC_REAL_END(fp_unavailable, 0x800, 0x100)
1651 EXC_VIRT_BEGIN(fp_unavailable, 0x4800, 0x100)
1652 GEN_INT_ENTRY fp_unavailable, virt=1
1653 EXC_VIRT_END(fp_unavailable, 0x4800, 0x100)
1654 EXC_COMMON_BEGIN(fp_unavailable_common)
1655 GEN_COMMON fp_unavailable
1656 bne 1f /* if from user, just load it up */
1657 RECONCILE_IRQ_STATE(r10, r11)
1658 addi r3,r1,STACK_FRAME_OVERHEAD
1659 bl kernel_fp_unavailable_exception
1661 EMIT_BUG_ENTRY 0b, __FILE__, __LINE__, 0
1663 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1665 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
1666 * transaction), go do TM stuff
1668 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
1670 END_FTR_SECTION_IFSET(CPU_FTR_TM)
1673 b fast_interrupt_return
1674 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1675 2: /* User process was in a transaction */
1676 RECONCILE_IRQ_STATE(r10, r11)
1677 addi r3,r1,STACK_FRAME_OVERHEAD
1678 bl fp_unavailable_tm
1682 GEN_KVM fp_unavailable
1686 * Interrupt 0x900 - Decrementer Interrupt.
1687 * This is an asynchronous interrupt in response to a decrementer exception
1688 * (e.g., DEC has wrapped below zero). It is maskable in hardware by clearing
1689 * MSR[EE], and soft-maskable with IRQS_DISABLED mask (i.e.,
1690 * local_irq_disable()).
1693 * This calls into Linux timer handler. NVGPRs are not saved (see 0x500).
1695 * If soft masked, the masked handler will note the pending interrupt for
1696 * replay, and bump the decrementer to a high value, leaving MSR[EE] enabled
1697 * in the interrupted context.
1698 * If PPC_WATCHDOG is configured, the soft masked handler will actually set
1699 * things back up to run soft_nmi_interrupt as a regular interrupt handler
1700 * on the emergency stack.
1702 INT_DEFINE_BEGIN(decrementer)
1705 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1708 INT_DEFINE_END(decrementer)
1710 EXC_REAL_BEGIN(decrementer, 0x900, 0x80)
1711 GEN_INT_ENTRY decrementer, virt=0
1712 EXC_REAL_END(decrementer, 0x900, 0x80)
1713 EXC_VIRT_BEGIN(decrementer, 0x4900, 0x80)
1714 GEN_INT_ENTRY decrementer, virt=1
1715 EXC_VIRT_END(decrementer, 0x4900, 0x80)
1716 EXC_COMMON_BEGIN(decrementer_common)
1717 GEN_COMMON decrementer
1720 addi r3,r1,STACK_FRAME_OVERHEAD
1728 * Interrupt 0x980 - Hypervisor Decrementer Interrupt.
1729 * This is an asynchronous interrupt, similar to 0x900 but for the HDEC
1733 * Linux does not use this outside KVM where it's used to keep a host timer
1734 * while the guest is given control of DEC. It should normally be caught by
1735 * the KVM test and routed there.
1737 INT_DEFINE_BEGIN(hdecrementer)
1744 INT_DEFINE_END(hdecrementer)
1746 EXC_REAL_BEGIN(hdecrementer, 0x980, 0x80)
1747 GEN_INT_ENTRY hdecrementer, virt=0
1748 EXC_REAL_END(hdecrementer, 0x980, 0x80)
1749 EXC_VIRT_BEGIN(hdecrementer, 0x4980, 0x80)
1750 GEN_INT_ENTRY hdecrementer, virt=1
1751 EXC_VIRT_END(hdecrementer, 0x4980, 0x80)
1752 EXC_COMMON_BEGIN(hdecrementer_common)
1753 __GEN_COMMON_ENTRY hdecrementer
1755 * Hypervisor decrementer interrupts not caught by the KVM test
1756 * shouldn't occur but are sometimes left pending on exit from a KVM
1757 * guest. We don't need to do anything to clear them, as they are
1760 * Be careful to avoid touching the kernel stack.
1762 ld r10,PACA_EXGEN+EX_CTR(r13)
1765 ld r9,PACA_EXGEN+EX_R9(r13)
1766 ld r10,PACA_EXGEN+EX_R10(r13)
1767 ld r11,PACA_EXGEN+EX_R11(r13)
1768 ld r12,PACA_EXGEN+EX_R12(r13)
1769 ld r13,PACA_EXGEN+EX_R13(r13)
1772 GEN_KVM hdecrementer
1776 * Interrupt 0xa00 - Directed Privileged Doorbell Interrupt.
1777 * This is an asynchronous interrupt in response to a msgsndp doorbell.
1778 * It is maskable in hardware by clearing MSR[EE], and soft-maskable with
1779 * IRQS_DISABLED mask (i.e., local_irq_disable()).
1782 * Guests may use this for IPIs between threads in a core if the
1783 * hypervisor supports it. NVGPRS are not saved (see 0x500).
1785 * If soft masked, the masked handler will note the pending interrupt for
1786 * replay, leaving MSR[EE] enabled in the interrupted context because the
1787 * doorbells are edge triggered.
1789 INT_DEFINE_BEGIN(doorbell_super)
1792 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1795 INT_DEFINE_END(doorbell_super)
1797 EXC_REAL_BEGIN(doorbell_super, 0xa00, 0x100)
1798 GEN_INT_ENTRY doorbell_super, virt=0
1799 EXC_REAL_END(doorbell_super, 0xa00, 0x100)
1800 EXC_VIRT_BEGIN(doorbell_super, 0x4a00, 0x100)
1801 GEN_INT_ENTRY doorbell_super, virt=1
1802 EXC_VIRT_END(doorbell_super, 0x4a00, 0x100)
1803 EXC_COMMON_BEGIN(doorbell_super_common)
1804 GEN_COMMON doorbell_super
1807 addi r3,r1,STACK_FRAME_OVERHEAD
1808 #ifdef CONFIG_PPC_DOORBELL
1809 bl doorbell_exception
1811 bl unknown_exception
1815 GEN_KVM doorbell_super
1818 EXC_REAL_NONE(0xb00, 0x100)
1819 EXC_VIRT_NONE(0x4b00, 0x100)
1822 * Interrupt 0xc00 - System Call Interrupt (syscall, hcall).
1823 * This is a synchronous interrupt invoked with the "sc" instruction. The
1824 * system call is invoked with "sc 0" and does not alter the HV bit, so it
1825 * is directed to the currently running OS. The hypercall is invoked with
1826 * "sc 1" and it sets HV=1, so it elevates to hypervisor.
1828 * In HPT, sc 1 always goes to 0xc00 real mode. In RADIX, sc 1 can go to
1829 * 0x4c00 virtual mode.
1832 * If the KVM test fires then it was due to a hypercall and is accordingly
1833 * routed to KVM. Otherwise this executes a normal Linux system call.
1837 * syscall and hypercalls register conventions are documented in
1838 * Documentation/powerpc/syscall64-abi.rst and
1839 * Documentation/powerpc/papr_hcalls.rst respectively.
1841 * The intersection of volatile registers that don't contain possible
1842 * inputs is: cr0, xer, ctr. We may use these as scratch regs upon entry
1843 * without saving, though xer is not a good idea to use, as hardware may
1844 * interpret some bits so it may be costly to change them.
1846 INT_DEFINE_BEGIN(system_call)
1850 INT_DEFINE_END(system_call)
1852 .macro SYSTEM_CALL virt
1853 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
1855 * There is a little bit of juggling to get syscall and hcall
1856 * working well. Save r13 in ctr to avoid using SPRG scratch
1859 * Userspace syscalls have already saved the PPR, hcalls must save
1860 * it before setting HMT_MEDIUM.
1864 std r10,PACA_EXGEN+EX_R10(r13)
1866 KVMTEST system_call /* uses r10, branch to system_call_kvm */
1874 #ifdef CONFIG_PPC_FAST_ENDIAN_SWITCH
1878 END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
1881 /* We reach here with PACA in r13, r13 in r9. */
1888 __LOAD_HANDLER(r10, system_call_common)
1890 ld r10,PACAKMSR(r13)
1893 b . /* prevent speculative execution */
1896 mtmsrd r10,1 /* Set RI (EE=0) */
1897 #ifdef CONFIG_RELOCATABLE
1898 __LOAD_HANDLER(r10, system_call_common)
1902 b system_call_common
1906 #ifdef CONFIG_PPC_FAST_ENDIAN_SWITCH
1907 /* Fast LE/BE switch system call */
1908 1: mfspr r12,SPRN_SRR1
1912 RFI_TO_USER /* return to userspace */
1913 b . /* prevent speculative execution */
1917 EXC_REAL_BEGIN(system_call, 0xc00, 0x100)
1919 EXC_REAL_END(system_call, 0xc00, 0x100)
1920 EXC_VIRT_BEGIN(system_call, 0x4c00, 0x100)
1922 EXC_VIRT_END(system_call, 0x4c00, 0x100)
1924 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
1925 TRAMP_REAL_BEGIN(system_call_kvm)
1927 * This is a hcall, so register convention is as above, with these
1931 * orig r10 saved in PACA
1934 * Save the PPR (on systems that support it) before changing to
1935 * HMT_MEDIUM. That allows the KVM code to save that value into the
1936 * guest state (it is the guest's PPR value).
1940 std r10,HSTATE_PPR(r13)
1941 END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
1946 std r12,HSTATE_SCRATCH0(r13)
1949 #ifdef CONFIG_RELOCATABLE
1951 * Requires __LOAD_FAR_HANDLER beause kvmppc_interrupt lives
1952 * outside the head section.
1954 __LOAD_FAR_HANDLER(r10, kvmppc_interrupt)
1956 ld r10,PACA_EXGEN+EX_R10(r13)
1959 ld r10,PACA_EXGEN+EX_R10(r13)
1966 * Interrupt 0xd00 - Trace Interrupt.
1967 * This is a synchronous interrupt in response to instruction step or
1968 * breakpoint faults.
1970 INT_DEFINE_BEGIN(single_step)
1972 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
1975 INT_DEFINE_END(single_step)
1977 EXC_REAL_BEGIN(single_step, 0xd00, 0x100)
1978 GEN_INT_ENTRY single_step, virt=0
1979 EXC_REAL_END(single_step, 0xd00, 0x100)
1980 EXC_VIRT_BEGIN(single_step, 0x4d00, 0x100)
1981 GEN_INT_ENTRY single_step, virt=1
1982 EXC_VIRT_END(single_step, 0x4d00, 0x100)
1983 EXC_COMMON_BEGIN(single_step_common)
1984 GEN_COMMON single_step
1985 addi r3,r1,STACK_FRAME_OVERHEAD
1986 bl single_step_exception
1993 * Interrupt 0xe00 - Hypervisor Data Storage Interrupt (HDSI).
1994 * This is a synchronous interrupt in response to an MMU fault caused by a
1995 * guest data access.
1998 * This should always get routed to KVM. In radix MMU mode, this is caused
1999 * by a guest nested radix access that can't be performed due to the
2000 * partition scope page table. In hash mode, this can be caused by guests
2001 * running with translation disabled (virtual real mode) or with VPM enabled.
2002 * KVM will update the page table structures or disallow the access.
2004 INT_DEFINE_BEGIN(h_data_storage)
2012 INT_DEFINE_END(h_data_storage)
2014 EXC_REAL_BEGIN(h_data_storage, 0xe00, 0x20)
2015 GEN_INT_ENTRY h_data_storage, virt=0, ool=1
2016 EXC_REAL_END(h_data_storage, 0xe00, 0x20)
2017 EXC_VIRT_BEGIN(h_data_storage, 0x4e00, 0x20)
2018 GEN_INT_ENTRY h_data_storage, virt=1, ool=1
2019 EXC_VIRT_END(h_data_storage, 0x4e00, 0x20)
2020 EXC_COMMON_BEGIN(h_data_storage_common)
2021 GEN_COMMON h_data_storage
2022 addi r3,r1,STACK_FRAME_OVERHEAD
2023 BEGIN_MMU_FTR_SECTION
2027 MMU_FTR_SECTION_ELSE
2028 bl unknown_exception
2029 ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_TYPE_RADIX)
2032 GEN_KVM h_data_storage
2036 * Interrupt 0xe20 - Hypervisor Instruction Storage Interrupt (HISI).
2037 * This is a synchronous interrupt in response to an MMU fault caused by a
2038 * guest instruction fetch, similar to HDSI.
2040 INT_DEFINE_BEGIN(h_instr_storage)
2045 INT_DEFINE_END(h_instr_storage)
2047 EXC_REAL_BEGIN(h_instr_storage, 0xe20, 0x20)
2048 GEN_INT_ENTRY h_instr_storage, virt=0, ool=1
2049 EXC_REAL_END(h_instr_storage, 0xe20, 0x20)
2050 EXC_VIRT_BEGIN(h_instr_storage, 0x4e20, 0x20)
2051 GEN_INT_ENTRY h_instr_storage, virt=1, ool=1
2052 EXC_VIRT_END(h_instr_storage, 0x4e20, 0x20)
2053 EXC_COMMON_BEGIN(h_instr_storage_common)
2054 GEN_COMMON h_instr_storage
2055 addi r3,r1,STACK_FRAME_OVERHEAD
2056 bl unknown_exception
2059 GEN_KVM h_instr_storage
2063 * Interrupt 0xe40 - Hypervisor Emulation Assistance Interrupt.
2065 INT_DEFINE_BEGIN(emulation_assist)
2070 INT_DEFINE_END(emulation_assist)
2072 EXC_REAL_BEGIN(emulation_assist, 0xe40, 0x20)
2073 GEN_INT_ENTRY emulation_assist, virt=0, ool=1
2074 EXC_REAL_END(emulation_assist, 0xe40, 0x20)
2075 EXC_VIRT_BEGIN(emulation_assist, 0x4e40, 0x20)
2076 GEN_INT_ENTRY emulation_assist, virt=1, ool=1
2077 EXC_VIRT_END(emulation_assist, 0x4e40, 0x20)
2078 EXC_COMMON_BEGIN(emulation_assist_common)
2079 GEN_COMMON emulation_assist
2080 addi r3,r1,STACK_FRAME_OVERHEAD
2081 bl emulation_assist_interrupt
2082 REST_NVGPRS(r1) /* instruction emulation may change GPRs */
2085 GEN_KVM emulation_assist
2089 * Interrupt 0xe60 - Hypervisor Maintenance Interrupt (HMI).
2090 * This is an asynchronous interrupt caused by a Hypervisor Maintenance
2091 * Exception. It is always taken in real mode but uses HSRR registers
2092 * unlike SRESET and MCE.
2094 * It is maskable in hardware by clearing MSR[EE], and partially soft-maskable
2095 * with IRQS_DISABLED mask (i.e., local_irq_disable()).
2098 * This is a special case, this is handled similarly to machine checks, with an
2099 * initial real mode handler that is not soft-masked, which attempts to fix the
2100 * problem. Then a regular handler which is soft-maskable and reports the
2103 * The emergency stack is used for the early real mode handler.
2105 * XXX: unclear why MCE and HMI schemes could not be made common, e.g.,
2106 * either use soft-masking for the MCE, or use irq_work for the HMI.
2109 * Unlike MCE, this calls into KVM without calling the real mode handler
2112 INT_DEFINE_BEGIN(hmi_exception_early)
2118 IKUAP=0 /* We don't touch AMR here, we never go to virtual mode */
2120 INT_DEFINE_END(hmi_exception_early)
2122 INT_DEFINE_BEGIN(hmi_exception)
2127 INT_DEFINE_END(hmi_exception)
2129 EXC_REAL_BEGIN(hmi_exception, 0xe60, 0x20)
2130 GEN_INT_ENTRY hmi_exception_early, virt=0, ool=1
2131 EXC_REAL_END(hmi_exception, 0xe60, 0x20)
2132 EXC_VIRT_NONE(0x4e60, 0x20)
2134 EXC_COMMON_BEGIN(hmi_exception_early_common)
2135 __GEN_REALMODE_COMMON_ENTRY hmi_exception_early
2137 mr r10,r1 /* Save r1 */
2138 ld r1,PACAEMERGSP(r13) /* Use emergency stack for realmode */
2139 subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
2141 __GEN_COMMON_BODY hmi_exception_early
2143 addi r3,r1,STACK_FRAME_OVERHEAD
2144 bl hmi_exception_realmode
2148 EXCEPTION_RESTORE_REGS hsrr=1
2149 HRFI_TO_USER_OR_KERNEL
2153 * Go to virtual mode and pull the HMI event information from
2156 EXCEPTION_RESTORE_REGS hsrr=1
2157 GEN_INT_ENTRY hmi_exception, virt=0
2159 GEN_KVM hmi_exception_early
2161 EXC_COMMON_BEGIN(hmi_exception_common)
2162 GEN_COMMON hmi_exception
2165 addi r3,r1,STACK_FRAME_OVERHEAD
2166 bl handle_hmi_exception
2169 GEN_KVM hmi_exception
2173 * Interrupt 0xe80 - Directed Hypervisor Doorbell Interrupt.
2174 * This is an asynchronous interrupt in response to a msgsnd doorbell.
2175 * Similar to the 0xa00 doorbell but for host rather than guest.
2177 INT_DEFINE_BEGIN(h_doorbell)
2183 INT_DEFINE_END(h_doorbell)
2185 EXC_REAL_BEGIN(h_doorbell, 0xe80, 0x20)
2186 GEN_INT_ENTRY h_doorbell, virt=0, ool=1
2187 EXC_REAL_END(h_doorbell, 0xe80, 0x20)
2188 EXC_VIRT_BEGIN(h_doorbell, 0x4e80, 0x20)
2189 GEN_INT_ENTRY h_doorbell, virt=1, ool=1
2190 EXC_VIRT_END(h_doorbell, 0x4e80, 0x20)
2191 EXC_COMMON_BEGIN(h_doorbell_common)
2192 GEN_COMMON h_doorbell
2195 addi r3,r1,STACK_FRAME_OVERHEAD
2196 #ifdef CONFIG_PPC_DOORBELL
2197 bl doorbell_exception
2199 bl unknown_exception
2207 * Interrupt 0xea0 - Hypervisor Virtualization Interrupt.
2208 * This is an asynchronous interrupt in response to an "external exception".
2209 * Similar to 0x500 but for host only.
2211 INT_DEFINE_BEGIN(h_virt_irq)
2217 INT_DEFINE_END(h_virt_irq)
2219 EXC_REAL_BEGIN(h_virt_irq, 0xea0, 0x20)
2220 GEN_INT_ENTRY h_virt_irq, virt=0, ool=1
2221 EXC_REAL_END(h_virt_irq, 0xea0, 0x20)
2222 EXC_VIRT_BEGIN(h_virt_irq, 0x4ea0, 0x20)
2223 GEN_INT_ENTRY h_virt_irq, virt=1, ool=1
2224 EXC_VIRT_END(h_virt_irq, 0x4ea0, 0x20)
2225 EXC_COMMON_BEGIN(h_virt_irq_common)
2226 GEN_COMMON h_virt_irq
2229 addi r3,r1,STACK_FRAME_OVERHEAD
2236 EXC_REAL_NONE(0xec0, 0x20)
2237 EXC_VIRT_NONE(0x4ec0, 0x20)
2238 EXC_REAL_NONE(0xee0, 0x20)
2239 EXC_VIRT_NONE(0x4ee0, 0x20)
2243 * Interrupt 0xf00 - Performance Monitor Interrupt (PMI, PMU).
2244 * This is an asynchronous interrupt in response to a PMU exception.
2245 * It is maskable in hardware by clearing MSR[EE], and soft-maskable with
2246 * IRQS_PMI_DISABLED mask (NOTE: NOT local_irq_disable()).
2249 * This calls into the perf subsystem.
2251 * Like the watchdog soft-nmi, it appears an NMI interrupt to Linux, in that it
2252 * runs under local_irq_disable. However it may be soft-masked in
2253 * powerpc-specific code.
2255 * If soft masked, the masked handler will note the pending interrupt for
2256 * replay, and clear MSR[EE] in the interrupted context.
2258 INT_DEFINE_BEGIN(performance_monitor)
2260 IMASK=IRQS_PMI_DISABLED
2261 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
2264 INT_DEFINE_END(performance_monitor)
2266 EXC_REAL_BEGIN(performance_monitor, 0xf00, 0x20)
2267 GEN_INT_ENTRY performance_monitor, virt=0, ool=1
2268 EXC_REAL_END(performance_monitor, 0xf00, 0x20)
2269 EXC_VIRT_BEGIN(performance_monitor, 0x4f00, 0x20)
2270 GEN_INT_ENTRY performance_monitor, virt=1, ool=1
2271 EXC_VIRT_END(performance_monitor, 0x4f00, 0x20)
2272 EXC_COMMON_BEGIN(performance_monitor_common)
2273 GEN_COMMON performance_monitor
2276 addi r3,r1,STACK_FRAME_OVERHEAD
2277 bl performance_monitor_exception
2280 GEN_KVM performance_monitor
2284 * Interrupt 0xf20 - Vector Unavailable Interrupt.
2285 * This is a synchronous interrupt in response to
2286 * executing a vector (or altivec) instruction with MSR[VEC]=0.
2287 * Similar to FP unavailable.
2289 INT_DEFINE_BEGIN(altivec_unavailable)
2292 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
2295 INT_DEFINE_END(altivec_unavailable)
2297 EXC_REAL_BEGIN(altivec_unavailable, 0xf20, 0x20)
2298 GEN_INT_ENTRY altivec_unavailable, virt=0, ool=1
2299 EXC_REAL_END(altivec_unavailable, 0xf20, 0x20)
2300 EXC_VIRT_BEGIN(altivec_unavailable, 0x4f20, 0x20)
2301 GEN_INT_ENTRY altivec_unavailable, virt=1, ool=1
2302 EXC_VIRT_END(altivec_unavailable, 0x4f20, 0x20)
2303 EXC_COMMON_BEGIN(altivec_unavailable_common)
2304 GEN_COMMON altivec_unavailable
2305 #ifdef CONFIG_ALTIVEC
2308 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2309 BEGIN_FTR_SECTION_NESTED(69)
2310 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
2311 * transaction), go do TM stuff
2313 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
2315 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
2318 b fast_interrupt_return
2319 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2320 2: /* User process was in a transaction */
2321 RECONCILE_IRQ_STATE(r10, r11)
2322 addi r3,r1,STACK_FRAME_OVERHEAD
2323 bl altivec_unavailable_tm
2327 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
2329 RECONCILE_IRQ_STATE(r10, r11)
2330 addi r3,r1,STACK_FRAME_OVERHEAD
2331 bl altivec_unavailable_exception
2334 GEN_KVM altivec_unavailable
2338 * Interrupt 0xf40 - VSX Unavailable Interrupt.
2339 * This is a synchronous interrupt in response to
2340 * executing a VSX instruction with MSR[VSX]=0.
2341 * Similar to FP unavailable.
2343 INT_DEFINE_BEGIN(vsx_unavailable)
2346 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
2349 INT_DEFINE_END(vsx_unavailable)
2351 EXC_REAL_BEGIN(vsx_unavailable, 0xf40, 0x20)
2352 GEN_INT_ENTRY vsx_unavailable, virt=0, ool=1
2353 EXC_REAL_END(vsx_unavailable, 0xf40, 0x20)
2354 EXC_VIRT_BEGIN(vsx_unavailable, 0x4f40, 0x20)
2355 GEN_INT_ENTRY vsx_unavailable, virt=1, ool=1
2356 EXC_VIRT_END(vsx_unavailable, 0x4f40, 0x20)
2357 EXC_COMMON_BEGIN(vsx_unavailable_common)
2358 GEN_COMMON vsx_unavailable
2362 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2363 BEGIN_FTR_SECTION_NESTED(69)
2364 /* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
2365 * transaction), go do TM stuff
2367 rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
2369 END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
2372 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
2373 2: /* User process was in a transaction */
2374 RECONCILE_IRQ_STATE(r10, r11)
2375 addi r3,r1,STACK_FRAME_OVERHEAD
2376 bl vsx_unavailable_tm
2380 END_FTR_SECTION_IFSET(CPU_FTR_VSX)
2382 RECONCILE_IRQ_STATE(r10, r11)
2383 addi r3,r1,STACK_FRAME_OVERHEAD
2384 bl vsx_unavailable_exception
2387 GEN_KVM vsx_unavailable
2391 * Interrupt 0xf60 - Facility Unavailable Interrupt.
2392 * This is a synchronous interrupt in response to
2393 * executing an instruction without access to the facility that can be
2394 * resolved by the OS (e.g., FSCR, MSR).
2395 * Similar to FP unavailable.
2397 INT_DEFINE_BEGIN(facility_unavailable)
2399 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
2402 INT_DEFINE_END(facility_unavailable)
2404 EXC_REAL_BEGIN(facility_unavailable, 0xf60, 0x20)
2405 GEN_INT_ENTRY facility_unavailable, virt=0, ool=1
2406 EXC_REAL_END(facility_unavailable, 0xf60, 0x20)
2407 EXC_VIRT_BEGIN(facility_unavailable, 0x4f60, 0x20)
2408 GEN_INT_ENTRY facility_unavailable, virt=1, ool=1
2409 EXC_VIRT_END(facility_unavailable, 0x4f60, 0x20)
2410 EXC_COMMON_BEGIN(facility_unavailable_common)
2411 GEN_COMMON facility_unavailable
2412 addi r3,r1,STACK_FRAME_OVERHEAD
2413 bl facility_unavailable_exception
2416 GEN_KVM facility_unavailable
2420 * Interrupt 0xf60 - Hypervisor Facility Unavailable Interrupt.
2421 * This is a synchronous interrupt in response to
2422 * executing an instruction without access to the facility that can only
2423 * be resolved in HV mode (e.g., HFSCR).
2424 * Similar to FP unavailable.
2426 INT_DEFINE_BEGIN(h_facility_unavailable)
2431 INT_DEFINE_END(h_facility_unavailable)
2433 EXC_REAL_BEGIN(h_facility_unavailable, 0xf80, 0x20)
2434 GEN_INT_ENTRY h_facility_unavailable, virt=0, ool=1
2435 EXC_REAL_END(h_facility_unavailable, 0xf80, 0x20)
2436 EXC_VIRT_BEGIN(h_facility_unavailable, 0x4f80, 0x20)
2437 GEN_INT_ENTRY h_facility_unavailable, virt=1, ool=1
2438 EXC_VIRT_END(h_facility_unavailable, 0x4f80, 0x20)
2439 EXC_COMMON_BEGIN(h_facility_unavailable_common)
2440 GEN_COMMON h_facility_unavailable
2441 addi r3,r1,STACK_FRAME_OVERHEAD
2442 bl facility_unavailable_exception
2445 GEN_KVM h_facility_unavailable
2448 EXC_REAL_NONE(0xfa0, 0x20)
2449 EXC_VIRT_NONE(0x4fa0, 0x20)
2450 EXC_REAL_NONE(0xfc0, 0x20)
2451 EXC_VIRT_NONE(0x4fc0, 0x20)
2452 EXC_REAL_NONE(0xfe0, 0x20)
2453 EXC_VIRT_NONE(0x4fe0, 0x20)
2455 EXC_REAL_NONE(0x1000, 0x100)
2456 EXC_VIRT_NONE(0x5000, 0x100)
2457 EXC_REAL_NONE(0x1100, 0x100)
2458 EXC_VIRT_NONE(0x5100, 0x100)
2460 #ifdef CONFIG_CBE_RAS
2461 INT_DEFINE_BEGIN(cbe_system_error)
2466 INT_DEFINE_END(cbe_system_error)
2468 EXC_REAL_BEGIN(cbe_system_error, 0x1200, 0x100)
2469 GEN_INT_ENTRY cbe_system_error, virt=0
2470 EXC_REAL_END(cbe_system_error, 0x1200, 0x100)
2471 EXC_VIRT_NONE(0x5200, 0x100)
2472 EXC_COMMON_BEGIN(cbe_system_error_common)
2473 GEN_COMMON cbe_system_error
2474 addi r3,r1,STACK_FRAME_OVERHEAD
2475 bl cbe_system_error_exception
2478 GEN_KVM cbe_system_error
2480 #else /* CONFIG_CBE_RAS */
2481 EXC_REAL_NONE(0x1200, 0x100)
2482 EXC_VIRT_NONE(0x5200, 0x100)
2486 INT_DEFINE_BEGIN(instruction_breakpoint)
2488 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
2492 INT_DEFINE_END(instruction_breakpoint)
2494 EXC_REAL_BEGIN(instruction_breakpoint, 0x1300, 0x100)
2495 GEN_INT_ENTRY instruction_breakpoint, virt=0
2496 EXC_REAL_END(instruction_breakpoint, 0x1300, 0x100)
2497 EXC_VIRT_BEGIN(instruction_breakpoint, 0x5300, 0x100)
2498 GEN_INT_ENTRY instruction_breakpoint, virt=1
2499 EXC_VIRT_END(instruction_breakpoint, 0x5300, 0x100)
2500 EXC_COMMON_BEGIN(instruction_breakpoint_common)
2501 GEN_COMMON instruction_breakpoint
2502 addi r3,r1,STACK_FRAME_OVERHEAD
2503 bl instruction_breakpoint_exception
2506 GEN_KVM instruction_breakpoint
2509 EXC_REAL_NONE(0x1400, 0x100)
2510 EXC_VIRT_NONE(0x5400, 0x100)
2513 * Interrupt 0x1500 - Soft Patch Interrupt
2516 * This is an implementation specific interrupt which can be used for a
2517 * range of exceptions.
2519 * This interrupt handler is unique in that it runs the denormal assist
2520 * code even for guests (and even in guest context) without going to KVM,
2521 * for speed. POWER9 does not raise denorm exceptions, so this special case
2522 * could be phased out in future to reduce special cases.
2524 INT_DEFINE_BEGIN(denorm_exception)
2529 INT_DEFINE_END(denorm_exception)
2531 EXC_REAL_BEGIN(denorm_exception, 0x1500, 0x100)
2532 GEN_INT_ENTRY denorm_exception, virt=0
2533 #ifdef CONFIG_PPC_DENORMALISATION
2534 andis. r10,r12,(HSRR1_DENORM)@h /* denorm? */
2537 GEN_BRANCH_TO_COMMON denorm_exception, virt=0
2538 EXC_REAL_END(denorm_exception, 0x1500, 0x100)
2539 #ifdef CONFIG_PPC_DENORMALISATION
2540 EXC_VIRT_BEGIN(denorm_exception, 0x5500, 0x100)
2541 GEN_INT_ENTRY denorm_exception, virt=1
2542 andis. r10,r12,(HSRR1_DENORM)@h /* denorm? */
2544 GEN_BRANCH_TO_COMMON denorm_exception, virt=1
2545 EXC_VIRT_END(denorm_exception, 0x5500, 0x100)
2547 EXC_VIRT_NONE(0x5500, 0x100)
2550 #ifdef CONFIG_PPC_DENORMALISATION
2551 TRAMP_REAL_BEGIN(denorm_assist)
2554 * To denormalise we need to move a copy of the register to itself.
2555 * For POWER6 do that here for all FP regs.
2558 ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1)
2559 xori r10,r10,(MSR_FE0|MSR_FE1)
2571 * To denormalise we need to move a copy of the register to itself.
2572 * For POWER7 do that here for the first 32 VSX registers only.
2575 oris r10,r10,MSR_VSX@h
2581 XVCPSGNDP(.Lreg,.Lreg,.Lreg)
2585 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
2589 END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
2591 * To denormalise we need to move a copy of the register to itself.
2592 * For POWER8 we need to do that for all 64 VSX registers
2596 XVCPSGNDP(.Lreg,.Lreg,.Lreg)
2601 mfspr r11,SPRN_HSRR0
2603 mtspr SPRN_HSRR0,r11
2605 ld r9,PACA_EXGEN+EX_R9(r13)
2607 ld r10,PACA_EXGEN+EX_PPR(r13)
2609 END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
2611 ld r10,PACA_EXGEN+EX_CFAR(r13)
2613 END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
2614 ld r10,PACA_EXGEN+EX_R10(r13)
2615 ld r11,PACA_EXGEN+EX_R11(r13)
2616 ld r12,PACA_EXGEN+EX_R12(r13)
2617 ld r13,PACA_EXGEN+EX_R13(r13)
2622 EXC_COMMON_BEGIN(denorm_exception_common)
2623 GEN_COMMON denorm_exception
2624 addi r3,r1,STACK_FRAME_OVERHEAD
2625 bl unknown_exception
2628 GEN_KVM denorm_exception
2631 #ifdef CONFIG_CBE_RAS
2632 INT_DEFINE_BEGIN(cbe_maintenance)
2637 INT_DEFINE_END(cbe_maintenance)
2639 EXC_REAL_BEGIN(cbe_maintenance, 0x1600, 0x100)
2640 GEN_INT_ENTRY cbe_maintenance, virt=0
2641 EXC_REAL_END(cbe_maintenance, 0x1600, 0x100)
2642 EXC_VIRT_NONE(0x5600, 0x100)
2643 EXC_COMMON_BEGIN(cbe_maintenance_common)
2644 GEN_COMMON cbe_maintenance
2645 addi r3,r1,STACK_FRAME_OVERHEAD
2646 bl cbe_maintenance_exception
2649 GEN_KVM cbe_maintenance
2651 #else /* CONFIG_CBE_RAS */
2652 EXC_REAL_NONE(0x1600, 0x100)
2653 EXC_VIRT_NONE(0x5600, 0x100)
2657 INT_DEFINE_BEGIN(altivec_assist)
2659 #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
2662 INT_DEFINE_END(altivec_assist)
2664 EXC_REAL_BEGIN(altivec_assist, 0x1700, 0x100)
2665 GEN_INT_ENTRY altivec_assist, virt=0
2666 EXC_REAL_END(altivec_assist, 0x1700, 0x100)
2667 EXC_VIRT_BEGIN(altivec_assist, 0x5700, 0x100)
2668 GEN_INT_ENTRY altivec_assist, virt=1
2669 EXC_VIRT_END(altivec_assist, 0x5700, 0x100)
2670 EXC_COMMON_BEGIN(altivec_assist_common)
2671 GEN_COMMON altivec_assist
2672 addi r3,r1,STACK_FRAME_OVERHEAD
2673 #ifdef CONFIG_ALTIVEC
2674 bl altivec_assist_exception
2675 REST_NVGPRS(r1) /* instruction emulation may change GPRs */
2677 bl unknown_exception
2681 GEN_KVM altivec_assist
2684 #ifdef CONFIG_CBE_RAS
2685 INT_DEFINE_BEGIN(cbe_thermal)
2690 INT_DEFINE_END(cbe_thermal)
2692 EXC_REAL_BEGIN(cbe_thermal, 0x1800, 0x100)
2693 GEN_INT_ENTRY cbe_thermal, virt=0
2694 EXC_REAL_END(cbe_thermal, 0x1800, 0x100)
2695 EXC_VIRT_NONE(0x5800, 0x100)
2696 EXC_COMMON_BEGIN(cbe_thermal_common)
2697 GEN_COMMON cbe_thermal
2698 addi r3,r1,STACK_FRAME_OVERHEAD
2699 bl cbe_thermal_exception
2704 #else /* CONFIG_CBE_RAS */
2705 EXC_REAL_NONE(0x1800, 0x100)
2706 EXC_VIRT_NONE(0x5800, 0x100)
2710 #ifdef CONFIG_PPC_WATCHDOG
2712 INT_DEFINE_BEGIN(soft_nmi)
2715 IRECONCILE=0 /* Soft-NMI may fire under local_irq_disable */
2716 INT_DEFINE_END(soft_nmi)
2719 * Branch to soft_nmi_interrupt using the emergency stack. The emergency
2720 * stack is one that is usable by maskable interrupts so long as MSR_EE
2721 * remains off. It is used for recovery when something has corrupted the
2722 * normal kernel stack, for example. The "soft NMI" must not use the process
2723 * stack because we want irq disabled sections to avoid touching the stack
2724 * at all (other than PMU interrupts), so use the emergency stack for this,
2725 * and run it entirely with interrupts hard disabled.
2727 EXC_COMMON_BEGIN(soft_nmi_common)
2730 ld r1,PACAEMERGSP(r13)
2731 subi r1,r1,INT_FRAME_SIZE
2732 __GEN_COMMON_BODY soft_nmi
2735 * Set IRQS_ALL_DISABLED and save PACAIRQHAPPENED (see
2736 * system_reset_common)
2738 li r10,IRQS_ALL_DISABLED
2739 stb r10,PACAIRQSOFTMASK(r13)
2740 lbz r10,PACAIRQHAPPENED(r13)
2742 ori r10,r10,PACA_IRQ_HARD_DIS
2743 stb r10,PACAIRQHAPPENED(r13)
2745 addi r3,r1,STACK_FRAME_OVERHEAD
2746 bl soft_nmi_interrupt
2748 /* Clear MSR_RI before setting SRR0 and SRR1. */
2753 * Restore soft mask settings.
2756 stb r10,PACAIRQHAPPENED(r13)
2758 stb r10,PACAIRQSOFTMASK(r13)
2760 kuap_restore_amr r10
2761 EXCEPTION_RESTORE_REGS hsrr=0
2764 #endif /* CONFIG_PPC_WATCHDOG */
2767 * An interrupt came in while soft-disabled. We set paca->irq_happened, then:
2768 * - If it was a decrementer interrupt, we bump the dec to max and and return.
2769 * - If it was a doorbell we return immediately since doorbells are edge
2770 * triggered and won't automatically refire.
2771 * - If it was a HMI we return immediately since we handled it in realmode
2772 * and it won't refire.
2773 * - Else it is one of PACA_IRQ_MUST_HARD_MASK, so hard disable and return.
2774 * This is called with r10 containing the value to OR to the paca field.
2776 .macro MASKED_INTERRUPT hsrr=0
2782 lbz r11,PACAIRQHAPPENED(r13)
2784 stb r11,PACAIRQHAPPENED(r13)
2785 cmpwi r10,PACA_IRQ_DEC
2790 #ifdef CONFIG_PPC_WATCHDOG
2795 1: andi. r10,r10,PACA_IRQ_MUST_HARD_MASK
2797 xori r12,r12,MSR_EE /* clear MSR_EE */
2799 mtspr SPRN_HSRR1,r12
2803 ori r11,r11,PACA_IRQ_HARD_DIS
2804 stb r11,PACAIRQHAPPENED(r13)
2806 ld r10,PACA_EXGEN+EX_CTR(r13)
2810 ld r9,PACA_EXGEN+EX_R9(r13)
2811 ld r10,PACA_EXGEN+EX_R10(r13)
2812 ld r11,PACA_EXGEN+EX_R11(r13)
2813 ld r12,PACA_EXGEN+EX_R12(r13)
2814 /* returns to kernel where r13 must be set up, so don't restore it */
2823 TRAMP_REAL_BEGIN(stf_barrier_fallback)
2824 std r9,PACA_EXRFI+EX_R9(r13)
2825 std r10,PACA_EXRFI+EX_R10(r13)
2827 ld r9,PACA_EXRFI+EX_R9(r13)
2828 ld r10,PACA_EXRFI+EX_R10(r13)
2836 TRAMP_REAL_BEGIN(rfi_flush_fallback)
2839 std r1,PACA_EXRFI+EX_R12(r13)
2840 ld r1,PACAKSAVE(r13)
2841 std r9,PACA_EXRFI+EX_R9(r13)
2842 std r10,PACA_EXRFI+EX_R10(r13)
2843 std r11,PACA_EXRFI+EX_R11(r13)
2845 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13)
2846 ld r11,PACA_L1D_FLUSH_SIZE(r13)
2847 srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */
2849 DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */
2851 /* order ld/st prior to dcbt stop all streams with flushing */
2855 * The load adresses are at staggered offsets within cachelines,
2856 * which suits some pipelines better (on others it should not
2860 ld r11,(0x80 + 8)*0(r10)
2861 ld r11,(0x80 + 8)*1(r10)
2862 ld r11,(0x80 + 8)*2(r10)
2863 ld r11,(0x80 + 8)*3(r10)
2864 ld r11,(0x80 + 8)*4(r10)
2865 ld r11,(0x80 + 8)*5(r10)
2866 ld r11,(0x80 + 8)*6(r10)
2867 ld r11,(0x80 + 8)*7(r10)
2872 ld r9,PACA_EXRFI+EX_R9(r13)
2873 ld r10,PACA_EXRFI+EX_R10(r13)
2874 ld r11,PACA_EXRFI+EX_R11(r13)
2875 ld r1,PACA_EXRFI+EX_R12(r13)
2879 TRAMP_REAL_BEGIN(hrfi_flush_fallback)
2882 std r1,PACA_EXRFI+EX_R12(r13)
2883 ld r1,PACAKSAVE(r13)
2884 std r9,PACA_EXRFI+EX_R9(r13)
2885 std r10,PACA_EXRFI+EX_R10(r13)
2886 std r11,PACA_EXRFI+EX_R11(r13)
2888 ld r10,PACA_RFI_FLUSH_FALLBACK_AREA(r13)
2889 ld r11,PACA_L1D_FLUSH_SIZE(r13)
2890 srdi r11,r11,(7 + 3) /* 128 byte lines, unrolled 8x */
2892 DCBT_BOOK3S_STOP_ALL_STREAM_IDS(r11) /* Stop prefetch streams */
2894 /* order ld/st prior to dcbt stop all streams with flushing */
2898 * The load adresses are at staggered offsets within cachelines,
2899 * which suits some pipelines better (on others it should not
2903 ld r11,(0x80 + 8)*0(r10)
2904 ld r11,(0x80 + 8)*1(r10)
2905 ld r11,(0x80 + 8)*2(r10)
2906 ld r11,(0x80 + 8)*3(r10)
2907 ld r11,(0x80 + 8)*4(r10)
2908 ld r11,(0x80 + 8)*5(r10)
2909 ld r11,(0x80 + 8)*6(r10)
2910 ld r11,(0x80 + 8)*7(r10)
2915 ld r9,PACA_EXRFI+EX_R9(r13)
2916 ld r10,PACA_EXRFI+EX_R10(r13)
2917 ld r11,PACA_EXRFI+EX_R11(r13)
2918 ld r1,PACA_EXRFI+EX_R12(r13)
2924 MASKED_INTERRUPT hsrr=1
2926 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
2927 kvmppc_skip_interrupt:
2929 * Here all GPRs are unchanged from when the interrupt happened
2930 * except for r13, which is saved in SPRG_SCRATCH0.
2932 mfspr r13, SPRN_SRR0
2934 mtspr SPRN_SRR0, r13
2939 kvmppc_skip_Hinterrupt:
2941 * Here all GPRs are unchanged from when the interrupt happened
2942 * except for r13, which is saved in SPRG_SCRATCH0.
2944 mfspr r13, SPRN_HSRR0
2946 mtspr SPRN_HSRR0, r13
2953 * Relocation-on interrupts: A subset of the interrupts can be delivered
2954 * with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
2955 * it. Addresses are the same as the original interrupt addresses, but
2956 * offset by 0xc000000000004000.
2957 * It's impossible to receive interrupts below 0x300 via this mechanism.
2958 * KVM: None of these traps are from the guest ; anything that escalated
2959 * to HV=1 from HV=0 is delivered via real mode handlers.
2963 * This uses the standard macro, since the original 0x300 vector
2964 * only has extra guff for STAB-based processors -- which never
2968 EXC_COMMON_BEGIN(ppc64_runlatch_on_trampoline)
2969 b __ppc64_runlatch_on
2971 USE_FIXED_SECTION(virt_trampolines)
2973 * The __end_interrupts marker must be past the out-of-line (OOL)
2974 * handlers, so that they are copied to real address 0x100 when running
2975 * a relocatable kernel. This ensures they can be reached from the short
2976 * trampoline handlers (like 0x4f00, 0x4f20, etc.) which branch
2977 * directly, without using LOAD_HANDLER().
2980 .globl __end_interrupts
2982 DEFINE_FIXED_SYMBOL(__end_interrupts)
2984 #ifdef CONFIG_PPC_970_NAP
2986 * Called by exception entry code if _TLF_NAPPING was set, this clears
2987 * the NAPPING flag, and redirects the exception exit to
2988 * power4_fixup_nap_return.
2990 .globl power4_fixup_nap
2991 EXC_COMMON_BEGIN(power4_fixup_nap)
2993 std r9,TI_LOCAL_FLAGS(r11)
2994 LOAD_REG_ADDR(r10, power4_idle_nap_return)
2998 power4_idle_nap_return:
3002 CLOSE_FIXED_SECTION(real_vectors);
3003 CLOSE_FIXED_SECTION(real_trampolines);
3004 CLOSE_FIXED_SECTION(virt_vectors);
3005 CLOSE_FIXED_SECTION(virt_trampolines);
3009 /* MSR[RI] should be clear because this uses SRR[01] */
3010 enable_machine_check:
3014 addi r3,r3,(1f - 0b)
3023 /* MSR[RI] should be clear because this uses SRR[01] */
3024 disable_machine_check:
3028 addi r3,r3,(1f - 0b)
3041 .balign IFETCH_ALIGN_BYTES
3043 #ifdef CONFIG_PPC_BOOK3S_64
3044 lis r0,(DSISR_BAD_FAULT_64S | DSISR_DABRMATCH | DSISR_KEYFAULT)@h
3045 ori r0,r0,DSISR_BAD_FAULT_64S@l
3046 and. r0,r5,r0 /* weird error? */
3047 bne- handle_page_fault /* if not, try to insert a HPTE */
3048 ld r11, PACA_THREAD_INFO(r13)
3049 lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */
3050 andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */
3051 bne 77f /* then don't call hash_page now */
3054 * r3 contains the trap number
3055 * r4 contains the faulting address
3059 * at return r3 = 0 for success, 1 for page fault, negative for error
3061 bl __hash_page /* build HPTE if possible */
3062 cmpdi r3,0 /* see if __hash_page succeeded */
3065 beq interrupt_return /* Return from exception on success */
3070 /* Reload DAR/DSISR into r4/r5 for the DABR check below */
3073 #endif /* CONFIG_PPC_BOOK3S_64 */
3075 /* Here we have a page fault that hash_page can't handle. */
3077 11: andis. r0,r5,DSISR_DABRMATCH@h
3078 bne- handle_dabr_fault
3079 addi r3,r1,STACK_FRAME_OVERHEAD
3082 beq+ interrupt_return
3084 addi r3,r1,STACK_FRAME_OVERHEAD
3089 /* We have a data breakpoint exception - handle it */
3093 addi r3,r1,STACK_FRAME_OVERHEAD
3096 * do_break() may have changed the NV GPRS while handling a breakpoint.
3097 * If so, we need to restore them with their updated values.
3103 #ifdef CONFIG_PPC_BOOK3S_64
3104 /* We have a page fault that hash_page could handle but HV refused
3108 addi r3,r1,STACK_FRAME_OVERHEAD
3115 * We come here as a result of a DSI at a point where we don't want
3116 * to call hash_page, such as when we are accessing memory (possibly
3117 * user memory) inside a PMU interrupt that occurred while interrupts
3118 * were soft-disabled. We want to invoke the exception handler for
3119 * the access, or panic if there isn't a handler.
3121 77: addi r3,r1,STACK_FRAME_OVERHEAD
projects / linux-2.6-microblaze.git / blob