1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Code that needs to run below 2 GB.
5 * Copyright IBM Corp. 2019
8 #include <linux/linkage.h>
12 .section .dma.text,"ax"
14 * Simplified version of expoline thunk. The normal thunks can not be used here,
15 * because they might be more than 2 GB away, and not reachable by the relative
16 * branch. No comdat, exrl, etc. optimizations used here, because it only
17 * affects a few functions that are not performance-relevant.
27 * int _diag14_dma(unsigned long rx, unsigned long ry1, unsigned long subcode)
43 EX_TABLE_DMA(.Ldiag14_ex, .Ldiag14_fault)
47 * int _diag210_dma(struct diag210 *addr)
61 EX_TABLE_DMA(.Ldiag210_ex, .Ldiag210_fault)
65 * int _diag26c_dma(void *req, void *resp, enum diag26c_sc subcode)
75 EX_TABLE_DMA(.Ldiag26c_ex, .Ldiag26c_ex)
79 * void _diag0c_dma(struct hypfs_diag0c_entry *entry)
89 * void _diag308_reset_dma(void)
91 * Calls diag 308 subcode 1 and continues execution
93 ENTRY(_diag308_reset_dma)
94 larl %r4,.Lctlregs # Save control registers
96 lg %r2,0(%r4) # Disable lowcore protection
101 larl %r4,.Lfpctl # Floating point control register
103 larl %r4,.Lprefix # Save prefix register
105 larl %r4,.Lprefix_zero # Set prefix register to 0
107 larl %r4,.Lcontinue_psw # Save PSW flags
110 larl %r4,restart_part2 # Setup restart PSW at absolute 0
111 larl %r3,.Lrestart_diag308_psw
112 og %r4,0(%r3) # Save PSW
114 sturg %r4,%r3 # Use sturg, because of large pages
119 lhi %r0,0 # Load r0 with zero
120 lhi %r1,2 # Use mode 2 = ESAME (dump)
121 sigp %r1,%r0,SIGP_SET_ARCHITECTURE # Switch to ESAME mode
122 sam64 # Switch to 64 bit addressing mode
123 larl %r4,.Lctlregs # Restore control registers
124 lctlg %c0,%c15,0(%r4)
125 larl %r4,.Lfpctl # Restore floating point ctl register
127 larl %r4,.Lprefix # Restore prefix register
129 larl %r4,.Lcontinue_psw # Restore PSW flags
135 ENDPROC(_diag308_reset_dma)
137 .section .dma.data,"aw",@progbits
139 .Lrestart_diag308_psw:
140 .long 0x00080000,0x80000000