2 * c 2001 PPC 64 Team, IBM Corp
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
10 #include <linux/smp.h>
11 #include <linux/export.h>
12 #include <linux/memblock.h>
13 #include <linux/sched/task.h>
15 #include <asm/lppaca.h>
17 #include <asm/sections.h>
18 #include <asm/pgtable.h>
19 #include <asm/kexec.h>
23 #ifdef CONFIG_PPC_BOOK3S
26 * The structure which the hypervisor knows about - this structure
27 * should not cross a page boundary. The vpa_init/register_vpa call
28 * is now known to fail if the lppaca structure crosses a page
29 * boundary. The lppaca is also used on POWER5 pSeries boxes.
30 * The lppaca is 640 bytes long, and cannot readily
31 * change since the hypervisor knows its layout, so a 1kB alignment
32 * will suffice to ensure that it doesn't cross a page boundary.
34 struct lppaca lppaca[] = {
35 [0 ... (NR_LPPACAS-1)] = {
36 .desc = cpu_to_be32(0xd397d781), /* "LpPa" */
37 .size = cpu_to_be16(sizeof(struct lppaca)),
39 .slb_count = cpu_to_be16(64),
45 static struct lppaca *extra_lppacas;
46 static long __initdata lppaca_size;
48 static void __init allocate_lppacas(int nr_cpus, unsigned long limit)
50 if (nr_cpus <= NR_LPPACAS)
53 lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) *
54 (nr_cpus - NR_LPPACAS));
55 extra_lppacas = __va(memblock_alloc_base(lppaca_size,
59 static struct lppaca * __init new_lppaca(int cpu)
66 lp = extra_lppacas + (cpu - NR_LPPACAS);
72 static void __init free_lppacas(void)
74 long new_size = 0, nr;
78 nr = num_possible_cpus() - NR_LPPACAS;
80 new_size = PAGE_ALIGN(nr * sizeof(struct lppaca));
81 if (new_size >= lppaca_size)
84 memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size);
85 lppaca_size = new_size;
90 static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { }
91 static inline void free_lppacas(void) { }
93 #endif /* CONFIG_PPC_BOOK3S */
95 #ifdef CONFIG_PPC_BOOK3S_64
98 * 3 persistent SLBs are registered here. The buffer will be zero
99 * initially, hence will all be invaild until we actually write them.
101 * If you make the number of persistent SLB entries dynamic, please also
102 * update PR KVM to flush and restore them accordingly.
104 static struct slb_shadow * __initdata slb_shadow;
106 static void __init allocate_slb_shadows(int nr_cpus, int limit)
108 int size = PAGE_ALIGN(sizeof(struct slb_shadow) * nr_cpus);
110 if (early_radix_enabled())
113 slb_shadow = __va(memblock_alloc_base(size, PAGE_SIZE, limit));
114 memset(slb_shadow, 0, size);
117 static struct slb_shadow * __init init_slb_shadow(int cpu)
119 struct slb_shadow *s;
121 if (early_radix_enabled())
124 s = &slb_shadow[cpu];
127 * When we come through here to initialise boot_paca, the slb_shadow
128 * buffers are not allocated yet. That's OK, we'll get one later in
129 * boot, but make sure we don't corrupt memory at 0.
134 s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
135 s->buffer_length = cpu_to_be32(sizeof(*s));
140 #else /* !CONFIG_PPC_BOOK3S_64 */
142 static void __init allocate_slb_shadows(int nr_cpus, int limit) { }
144 #endif /* CONFIG_PPC_BOOK3S_64 */
146 /* The Paca is an array with one entry per processor. Each contains an
147 * lppaca, which contains the information shared between the
148 * hypervisor and Linux.
149 * On systems with hardware multi-threading, there are two threads
150 * per processor. The Paca array must contain an entry for each thread.
151 * The VPD Areas will give a max logical processors = 2 * max physical
152 * processors. The processor VPD array needs one entry per physical
153 * processor (not thread).
155 struct paca_struct *paca;
158 void __init initialise_paca(struct paca_struct *new_paca, int cpu)
160 #ifdef CONFIG_PPC_BOOK3S
161 new_paca->lppaca_ptr = new_lppaca(cpu);
163 new_paca->kernel_pgd = swapper_pg_dir;
165 new_paca->lock_token = 0x8000;
166 new_paca->paca_index = cpu;
167 new_paca->kernel_toc = kernel_toc_addr();
168 new_paca->kernelbase = (unsigned long) _stext;
169 /* Only set MSR:IR/DR when MMU is initialized */
170 new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
171 new_paca->hw_cpu_id = 0xffff;
172 new_paca->kexec_state = KEXEC_STATE_NONE;
173 new_paca->__current = &init_task;
174 new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
175 #ifdef CONFIG_PPC_BOOK3S_64
176 new_paca->slb_shadow_ptr = init_slb_shadow(cpu);
179 #ifdef CONFIG_PPC_BOOK3E
180 /* For now -- if we have threads this will be adjusted later */
181 new_paca->tcd_ptr = &new_paca->tcd;
185 /* Put the paca pointer into r13 and SPRG_PACA */
186 void setup_paca(struct paca_struct *new_paca)
189 local_paca = new_paca;
191 #ifdef CONFIG_PPC_BOOK3E
192 /* On Book3E, initialize the TLB miss exception frames */
193 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
195 /* In HV mode, we setup both HPACA and PACA to avoid problems
196 * if we do a GET_PACA() before the feature fixups have been
199 if (early_cpu_has_feature(CPU_FTR_HVMODE))
200 mtspr(SPRN_SPRG_HPACA, local_paca);
202 mtspr(SPRN_SPRG_PACA, local_paca);
206 static int __initdata paca_size;
208 void __init allocate_pacas(void)
213 #ifdef CONFIG_PPC_BOOK3S_64
215 * We access pacas in real mode, and cannot take SLB faults
216 * on them when in virtual mode, so allocate them accordingly.
218 limit = min(ppc64_bolted_size(), ppc64_rma_size);
220 limit = ppc64_rma_size;
223 paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
225 paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
226 memset(paca, 0, paca_size);
228 printk(KERN_DEBUG "Allocated %u bytes for %u pacas at %p\n",
229 paca_size, nr_cpu_ids, paca);
231 allocate_lppacas(nr_cpu_ids, limit);
233 allocate_slb_shadows(nr_cpu_ids, limit);
235 /* Can't use for_each_*_cpu, as they aren't functional yet */
236 for (cpu = 0; cpu < nr_cpu_ids; cpu++)
237 initialise_paca(&paca[cpu], cpu);
240 void __init free_unused_pacas(void)
244 new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
246 if (new_size >= paca_size)
249 memblock_free(__pa(paca) + new_size, paca_size - new_size);
251 printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
252 paca_size - new_size);
254 paca_size = new_size;
259 void copy_mm_to_paca(struct mm_struct *mm)
261 #ifdef CONFIG_PPC_BOOK3S
262 mm_context_t *context = &mm->context;
264 get_paca()->mm_ctx_id = context->id;
265 #ifdef CONFIG_PPC_MM_SLICES
266 VM_BUG_ON(!mm->context.slb_addr_limit);
267 get_paca()->mm_ctx_slb_addr_limit = mm->context.slb_addr_limit;
268 get_paca()->mm_ctx_low_slices_psize = context->low_slices_psize;
269 memcpy(&get_paca()->mm_ctx_high_slices_psize,
270 &context->high_slices_psize, TASK_SLICE_ARRAY_SZ(mm));
271 #else /* CONFIG_PPC_MM_SLICES */
272 get_paca()->mm_ctx_user_psize = context->user_psize;
273 get_paca()->mm_ctx_sllp = context->sllp;
275 #else /* !CONFIG_PPC_BOOK3S */