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), | |
39 | .dyn_proc_status = 2, | |
40 | .decr_val = 0x00ff0000, | |
41 | .fpregs_in_use = 1, | |
42 | .end_of_quantum = 0xfffffffffffffffful, | |
43 | .slb_count = 64, | |
44 | .vmxregs_in_use = 0, | |
40900194 | 45 | .page_ins = 0, |
3356bb9f DG |
46 | }, |
47 | }; | |
48 | ||
93c22703 PM |
49 | static struct lppaca *extra_lppacas; |
50 | static long __initdata lppaca_size; | |
51 | ||
52 | static void allocate_lppacas(int nr_cpus, unsigned long limit) | |
53 | { | |
54 | if (nr_cpus <= NR_LPPACAS) | |
55 | return; | |
56 | ||
57 | lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) * | |
58 | (nr_cpus - NR_LPPACAS)); | |
59 | extra_lppacas = __va(memblock_alloc_base(lppaca_size, | |
60 | PAGE_SIZE, limit)); | |
61 | } | |
62 | ||
63 | static struct lppaca *new_lppaca(int cpu) | |
64 | { | |
65 | struct lppaca *lp; | |
66 | ||
67 | if (cpu < NR_LPPACAS) | |
68 | return &lppaca[cpu]; | |
69 | ||
70 | lp = extra_lppacas + (cpu - NR_LPPACAS); | |
71 | *lp = lppaca[0]; | |
72 | ||
73 | return lp; | |
74 | } | |
75 | ||
76 | static void free_lppacas(void) | |
77 | { | |
78 | long new_size = 0, nr; | |
79 | ||
80 | if (!lppaca_size) | |
81 | return; | |
82 | nr = num_possible_cpus() - NR_LPPACAS; | |
83 | if (nr > 0) | |
84 | new_size = PAGE_ALIGN(nr * sizeof(struct lppaca)); | |
85 | if (new_size >= lppaca_size) | |
86 | return; | |
87 | ||
88 | memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size); | |
89 | lppaca_size = new_size; | |
90 | } | |
91 | ||
92 | #else | |
93 | ||
3c4b7644 | 94 | static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { } |
93c22703 PM |
95 | static inline void free_lppacas(void) { } |
96 | ||
91c60b5b BH |
97 | #endif /* CONFIG_PPC_BOOK3S */ |
98 | ||
99 | #ifdef CONFIG_PPC_STD_MMU_64 | |
100 | ||
2f6093c8 MN |
101 | /* |
102 | * 3 persistent SLBs are registered here. The buffer will be zero | |
103 | * initially, hence will all be invaild until we actually write them. | |
104 | */ | |
105 | struct slb_shadow slb_shadow[] __cacheline_aligned = { | |
106 | [0 ... (NR_CPUS-1)] = { | |
107 | .persistent = SLB_NUM_BOLTED, | |
108 | .buffer_length = sizeof(struct slb_shadow), | |
109 | }, | |
110 | }; | |
111 | ||
91c60b5b BH |
112 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
113 | ||
8882a4da | 114 | /* The Paca is an array with one entry per processor. Each contains an |
1da177e4 | 115 | * lppaca, which contains the information shared between the |
1888e7b5 | 116 | * hypervisor and Linux. |
1da177e4 LT |
117 | * On systems with hardware multi-threading, there are two threads |
118 | * per processor. The Paca array must contain an entry for each thread. | |
119 | * The VPD Areas will give a max logical processors = 2 * max physical | |
120 | * processors. The processor VPD array needs one entry per physical | |
121 | * processor (not thread). | |
122 | */ | |
1426d5a3 | 123 | struct paca_struct *paca; |
1da177e4 | 124 | EXPORT_SYMBOL(paca); |
90035fe3 | 125 | |
1426d5a3 | 126 | struct paca_struct boot_paca; |
90035fe3 | 127 | |
1426d5a3 ME |
128 | void __init initialise_paca(struct paca_struct *new_paca, int cpu) |
129 | { | |
130 | /* The TOC register (GPR2) points 32kB into the TOC, so that 64kB | |
131 | * of the TOC can be addressed using a single machine instruction. | |
132 | */ | |
90035fe3 TB |
133 | unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL; |
134 | ||
91c60b5b | 135 | #ifdef CONFIG_PPC_BOOK3S |
93c22703 | 136 | new_paca->lppaca_ptr = new_lppaca(cpu); |
dce6670a | 137 | #else |
1426d5a3 | 138 | new_paca->kernel_pgd = swapper_pg_dir; |
91c60b5b | 139 | #endif |
1426d5a3 ME |
140 | new_paca->lock_token = 0x8000; |
141 | new_paca->paca_index = cpu; | |
142 | new_paca->kernel_toc = kernel_toc; | |
143 | new_paca->kernelbase = (unsigned long) _stext; | |
144 | new_paca->kernel_msr = MSR_KERNEL; | |
145 | new_paca->hw_cpu_id = 0xffff; | |
1fc711f7 | 146 | new_paca->kexec_state = KEXEC_STATE_NONE; |
1426d5a3 | 147 | new_paca->__current = &init_task; |
91c60b5b | 148 | #ifdef CONFIG_PPC_STD_MMU_64 |
1426d5a3 | 149 | new_paca->slb_shadow_ptr = &slb_shadow[cpu]; |
91c60b5b | 150 | #endif /* CONFIG_PPC_STD_MMU_64 */ |
1426d5a3 ME |
151 | } |
152 | ||
fc53b420 ME |
153 | /* Put the paca pointer into r13 and SPRG_PACA */ |
154 | void setup_paca(struct paca_struct *new_paca) | |
155 | { | |
2dd60d79 | 156 | /* Setup r13 */ |
fc53b420 | 157 | local_paca = new_paca; |
2dd60d79 | 158 | |
fc53b420 | 159 | #ifdef CONFIG_PPC_BOOK3E |
2dd60d79 | 160 | /* On Book3E, initialize the TLB miss exception frames */ |
fc53b420 | 161 | mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); |
2dd60d79 BH |
162 | #else |
163 | /* In HV mode, we setup both HPACA and PACA to avoid problems | |
164 | * if we do a GET_PACA() before the feature fixups have been | |
165 | * applied | |
166 | */ | |
969391c5 | 167 | if (cpu_has_feature(CPU_FTR_HVMODE)) |
2dd60d79 | 168 | mtspr(SPRN_SPRG_HPACA, local_paca); |
fc53b420 | 169 | #endif |
2dd60d79 BH |
170 | mtspr(SPRN_SPRG_PACA, local_paca); |
171 | ||
fc53b420 ME |
172 | } |
173 | ||
1426d5a3 ME |
174 | static int __initdata paca_size; |
175 | ||
176 | void __init allocate_pacas(void) | |
177 | { | |
2cd947f1 | 178 | int cpu, limit; |
1426d5a3 ME |
179 | |
180 | /* | |
181 | * We can't take SLB misses on the paca, and we want to access them | |
182 | * in real mode, so allocate them within the RMA and also within | |
f5339277 | 183 | * the first segment. |
1426d5a3 | 184 | */ |
cd3db0c4 | 185 | limit = min(0x10000000ULL, ppc64_rma_size); |
1426d5a3 | 186 | |
2cd947f1 | 187 | paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); |
1426d5a3 | 188 | |
95f72d1e | 189 | paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit)); |
1426d5a3 ME |
190 | memset(paca, 0, paca_size); |
191 | ||
192 | printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n", | |
2cd947f1 | 193 | paca_size, nr_cpu_ids, paca); |
1426d5a3 | 194 | |
2cd947f1 | 195 | allocate_lppacas(nr_cpu_ids, limit); |
93c22703 | 196 | |
1426d5a3 | 197 | /* Can't use for_each_*_cpu, as they aren't functional yet */ |
2cd947f1 | 198 | for (cpu = 0; cpu < nr_cpu_ids; cpu++) |
1426d5a3 ME |
199 | initialise_paca(&paca[cpu], cpu); |
200 | } | |
201 | ||
202 | void __init free_unused_pacas(void) | |
203 | { | |
204 | int new_size; | |
205 | ||
c1854e00 | 206 | new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); |
1426d5a3 ME |
207 | |
208 | if (new_size >= paca_size) | |
209 | return; | |
210 | ||
95f72d1e | 211 | memblock_free(__pa(paca) + new_size, paca_size - new_size); |
1426d5a3 ME |
212 | |
213 | printk(KERN_DEBUG "Freed %u bytes for unused pacas\n", | |
214 | paca_size - new_size); | |
90035fe3 | 215 | |
1426d5a3 | 216 | paca_size = new_size; |
93c22703 PM |
217 | |
218 | free_lppacas(); | |
90035fe3 | 219 | } |