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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * c 2001 PPC 64 Team, IBM Corp | |
3 | * | |
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. | |
8 | */ | |
9 | ||
2cd947f1 | 10 | #include <linux/smp.h> |
4b16f8e2 | 11 | #include <linux/export.h> |
95f72d1e | 12 | #include <linux/memblock.h> |
1da177e4 | 13 | |
1da177e4 | 14 | #include <asm/lppaca.h> |
1da177e4 | 15 | #include <asm/paca.h> |
549e8152 | 16 | #include <asm/sections.h> |
dce6670a | 17 | #include <asm/pgtable.h> |
1fc711f7 | 18 | #include <asm/kexec.h> |
1da177e4 LT |
19 | |
20 | /* This symbol is provided by the linker - let it fill in the paca | |
21 | * field correctly */ | |
22 | extern unsigned long __toc_start; | |
23 | ||
91c60b5b BH |
24 | #ifdef CONFIG_PPC_BOOK3S |
25 | ||
3356bb9f | 26 | /* |
30ff2e87 | 27 | * The structure which the hypervisor knows about - this structure |
3356bb9f DG |
28 | * should not cross a page boundary. The vpa_init/register_vpa call |
29 | * is now known to fail if the lppaca structure crosses a page | |
f5339277 SR |
30 | * boundary. The lppaca is also used on POWER5 pSeries boxes. |
31 | * The lppaca is 640 bytes long, and cannot readily | |
30ff2e87 SR |
32 | * change since the hypervisor knows its layout, so a 1kB alignment |
33 | * will suffice to ensure that it doesn't cross a page boundary. | |
3356bb9f DG |
34 | */ |
35 | struct lppaca lppaca[] = { | |
93c22703 | 36 | [0 ... (NR_LPPACAS-1)] = { |
3356bb9f DG |
37 | .desc = 0xd397d781, /* "LpPa" */ |
38 | .size = sizeof(struct lppaca), | |
3356bb9f | 39 | .fpregs_in_use = 1, |
3356bb9f DG |
40 | .slb_count = 64, |
41 | .vmxregs_in_use = 0, | |
40900194 | 42 | .page_ins = 0, |
3356bb9f DG |
43 | }, |
44 | }; | |
45 | ||
93c22703 PM |
46 | static struct lppaca *extra_lppacas; |
47 | static long __initdata lppaca_size; | |
48 | ||
49 | static void allocate_lppacas(int nr_cpus, unsigned long limit) | |
50 | { | |
51 | if (nr_cpus <= NR_LPPACAS) | |
52 | return; | |
53 | ||
54 | lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) * | |
55 | (nr_cpus - NR_LPPACAS)); | |
56 | extra_lppacas = __va(memblock_alloc_base(lppaca_size, | |
57 | PAGE_SIZE, limit)); | |
58 | } | |
59 | ||
60 | static struct lppaca *new_lppaca(int cpu) | |
61 | { | |
62 | struct lppaca *lp; | |
63 | ||
64 | if (cpu < NR_LPPACAS) | |
65 | return &lppaca[cpu]; | |
66 | ||
67 | lp = extra_lppacas + (cpu - NR_LPPACAS); | |
68 | *lp = lppaca[0]; | |
69 | ||
70 | return lp; | |
71 | } | |
72 | ||
73 | static void free_lppacas(void) | |
74 | { | |
75 | long new_size = 0, nr; | |
76 | ||
77 | if (!lppaca_size) | |
78 | return; | |
79 | nr = num_possible_cpus() - NR_LPPACAS; | |
80 | if (nr > 0) | |
81 | new_size = PAGE_ALIGN(nr * sizeof(struct lppaca)); | |
82 | if (new_size >= lppaca_size) | |
83 | return; | |
84 | ||
85 | memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size); | |
86 | lppaca_size = new_size; | |
87 | } | |
88 | ||
89 | #else | |
90 | ||
3c4b7644 | 91 | static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { } |
93c22703 PM |
92 | static inline void free_lppacas(void) { } |
93 | ||
91c60b5b BH |
94 | #endif /* CONFIG_PPC_BOOK3S */ |
95 | ||
96 | #ifdef CONFIG_PPC_STD_MMU_64 | |
97 | ||
2f6093c8 MN |
98 | /* |
99 | * 3 persistent SLBs are registered here. The buffer will be zero | |
100 | * initially, hence will all be invaild until we actually write them. | |
101 | */ | |
102 | struct slb_shadow slb_shadow[] __cacheline_aligned = { | |
103 | [0 ... (NR_CPUS-1)] = { | |
104 | .persistent = SLB_NUM_BOLTED, | |
105 | .buffer_length = sizeof(struct slb_shadow), | |
106 | }, | |
107 | }; | |
108 | ||
91c60b5b BH |
109 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
110 | ||
8882a4da | 111 | /* The Paca is an array with one entry per processor. Each contains an |
1da177e4 | 112 | * lppaca, which contains the information shared between the |
1888e7b5 | 113 | * hypervisor and Linux. |
1da177e4 LT |
114 | * On systems with hardware multi-threading, there are two threads |
115 | * per processor. The Paca array must contain an entry for each thread. | |
116 | * The VPD Areas will give a max logical processors = 2 * max physical | |
117 | * processors. The processor VPD array needs one entry per physical | |
118 | * processor (not thread). | |
119 | */ | |
1426d5a3 | 120 | struct paca_struct *paca; |
1da177e4 | 121 | EXPORT_SYMBOL(paca); |
90035fe3 | 122 | |
1426d5a3 | 123 | struct paca_struct boot_paca; |
90035fe3 | 124 | |
1426d5a3 ME |
125 | void __init initialise_paca(struct paca_struct *new_paca, int cpu) |
126 | { | |
127 | /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB | |
128 | * of the TOC can be addressed using a single machine instruction. | |
129 | */ | |
90035fe3 TB |
130 | unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL; |
131 | ||
91c60b5b | 132 | #ifdef CONFIG_PPC_BOOK3S |
93c22703 | 133 | new_paca->lppaca_ptr = new_lppaca(cpu); |
dce6670a | 134 | #else |
1426d5a3 | 135 | new_paca->kernel_pgd = swapper_pg_dir; |
91c60b5b | 136 | #endif |
1426d5a3 ME |
137 | new_paca->lock_token = 0x8000; |
138 | new_paca->paca_index = cpu; | |
139 | new_paca->kernel_toc = kernel_toc; | |
140 | new_paca->kernelbase = (unsigned long) _stext; | |
141 | new_paca->kernel_msr = MSR_KERNEL; | |
142 | new_paca->hw_cpu_id = 0xffff; | |
1fc711f7 | 143 | new_paca->kexec_state = KEXEC_STATE_NONE; |
1426d5a3 | 144 | new_paca->__current = &init_task; |
91c60b5b | 145 | #ifdef CONFIG_PPC_STD_MMU_64 |
1426d5a3 | 146 | new_paca->slb_shadow_ptr = &slb_shadow[cpu]; |
91c60b5b | 147 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
1426d5a3 ME |
148 | } |
149 | ||
fc53b420 ME |
150 | /* Put the paca pointer into r13 and SPRG_PACA */ |
151 | void setup_paca(struct paca_struct *new_paca) | |
152 | { | |
2dd60d79 | 153 | /* Setup r13 */ |
fc53b420 | 154 | local_paca = new_paca; |
2dd60d79 | 155 | |
fc53b420 | 156 | #ifdef CONFIG_PPC_BOOK3E |
2dd60d79 | 157 | /* On Book3E, initialize the TLB miss exception frames */ |
fc53b420 | 158 | mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); |
2dd60d79 BH |
159 | #else |
160 | /* In HV mode, we setup both HPACA and PACA to avoid problems | |
161 | * if we do a GET_PACA() before the feature fixups have been | |
162 | * applied | |
163 | */ | |
969391c5 | 164 | if (cpu_has_feature(CPU_FTR_HVMODE)) |
2dd60d79 | 165 | mtspr(SPRN_SPRG_HPACA, local_paca); |
fc53b420 | 166 | #endif |
2dd60d79 BH |
167 | mtspr(SPRN_SPRG_PACA, local_paca); |
168 | ||
fc53b420 ME |
169 | } |
170 | ||
1426d5a3 ME |
171 | static int __initdata paca_size; |
172 | ||
173 | void __init allocate_pacas(void) | |
174 | { | |
2cd947f1 | 175 | int cpu, limit; |
1426d5a3 ME |
176 | |
177 | /* | |
178 | * We can't take SLB misses on the paca, and we want to access them | |
179 | * in real mode, so allocate them within the RMA and also within | |
f5339277 | 180 | * the first segment. |
1426d5a3 | 181 | */ |
cd3db0c4 | 182 | limit = min(0x10000000ULL, ppc64_rma_size); |
1426d5a3 | 183 | |
2cd947f1 | 184 | paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); |
1426d5a3 | 185 | |
95f72d1e | 186 | paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit)); |
1426d5a3 ME |
187 | memset(paca, 0, paca_size); |
188 | ||
189 | printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n", | |
2cd947f1 | 190 | paca_size, nr_cpu_ids, paca); |
1426d5a3 | 191 | |
2cd947f1 | 192 | allocate_lppacas(nr_cpu_ids, limit); |
93c22703 | 193 | |
1426d5a3 | 194 | /* Can't use for_each_*_cpu, as they aren't functional yet */ |
2cd947f1 | 195 | for (cpu = 0; cpu < nr_cpu_ids; cpu++) |
1426d5a3 ME |
196 | initialise_paca(&paca[cpu], cpu); |
197 | } | |
198 | ||
199 | void __init free_unused_pacas(void) | |
200 | { | |
201 | int new_size; | |
202 | ||
c1854e00 | 203 | new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); |
1426d5a3 ME |
204 | |
205 | if (new_size >= paca_size) | |
206 | return; | |
207 | ||
95f72d1e | 208 | memblock_free(__pa(paca) + new_size, paca_size - new_size); |
1426d5a3 ME |
209 | |
210 | printk(KERN_DEBUG "Freed %u bytes for unused pacas\n", | |
211 | paca_size - new_size); | |
90035fe3 | 212 | |
1426d5a3 | 213 | paca_size = new_size; |
93c22703 PM |
214 | |
215 | free_lppacas(); | |
90035fe3 | 216 | } |