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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 | ||
10 | #include <linux/smp.h> | |
11 | #include <linux/export.h> | |
12 | #include <linux/memblock.h> | |
13 | ||
14 | #include <asm/lppaca.h> | |
15 | #include <asm/paca.h> | |
16 | #include <asm/sections.h> | |
17 | #include <asm/pgtable.h> | |
18 | #include <asm/kexec.h> | |
19 | ||
20 | #ifdef CONFIG_PPC_BOOK3S | |
21 | ||
22 | /* | |
23 | * The structure which the hypervisor knows about - this structure | |
24 | * should not cross a page boundary. The vpa_init/register_vpa call | |
25 | * is now known to fail if the lppaca structure crosses a page | |
26 | * boundary. The lppaca is also used on POWER5 pSeries boxes. | |
27 | * The lppaca is 640 bytes long, and cannot readily | |
28 | * change since the hypervisor knows its layout, so a 1kB alignment | |
29 | * will suffice to ensure that it doesn't cross a page boundary. | |
30 | */ | |
31 | struct lppaca lppaca[] = { | |
32 | [0 ... (NR_LPPACAS-1)] = { | |
33 | .desc = cpu_to_be32(0xd397d781), /* "LpPa" */ | |
34 | .size = cpu_to_be16(sizeof(struct lppaca)), | |
35 | .fpregs_in_use = 1, | |
36 | .slb_count = cpu_to_be16(64), | |
37 | .vmxregs_in_use = 0, | |
38 | .page_ins = 0, | |
39 | }, | |
40 | }; | |
41 | ||
42 | static struct lppaca *extra_lppacas; | |
43 | static long __initdata lppaca_size; | |
44 | ||
45 | static void __init allocate_lppacas(int nr_cpus, unsigned long limit) | |
46 | { | |
47 | if (nr_cpus <= NR_LPPACAS) | |
48 | return; | |
49 | ||
50 | lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) * | |
51 | (nr_cpus - NR_LPPACAS)); | |
52 | extra_lppacas = __va(memblock_alloc_base(lppaca_size, | |
53 | PAGE_SIZE, limit)); | |
54 | } | |
55 | ||
56 | static struct lppaca * __init new_lppaca(int cpu) | |
57 | { | |
58 | struct lppaca *lp; | |
59 | ||
60 | if (cpu < NR_LPPACAS) | |
61 | return &lppaca[cpu]; | |
62 | ||
63 | lp = extra_lppacas + (cpu - NR_LPPACAS); | |
64 | *lp = lppaca[0]; | |
65 | ||
66 | return lp; | |
67 | } | |
68 | ||
69 | static void __init free_lppacas(void) | |
70 | { | |
71 | long new_size = 0, nr; | |
72 | ||
73 | if (!lppaca_size) | |
74 | return; | |
75 | nr = num_possible_cpus() - NR_LPPACAS; | |
76 | if (nr > 0) | |
77 | new_size = PAGE_ALIGN(nr * sizeof(struct lppaca)); | |
78 | if (new_size >= lppaca_size) | |
79 | return; | |
80 | ||
81 | memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size); | |
82 | lppaca_size = new_size; | |
83 | } | |
84 | ||
85 | #else | |
86 | ||
87 | static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { } | |
88 | static inline void free_lppacas(void) { } | |
89 | ||
90 | #endif /* CONFIG_PPC_BOOK3S */ | |
91 | ||
92 | #ifdef CONFIG_PPC_STD_MMU_64 | |
93 | ||
94 | /* | |
95 | * 3 persistent SLBs are registered here. The buffer will be zero | |
96 | * initially, hence will all be invaild until we actually write them. | |
97 | * | |
98 | * If you make the number of persistent SLB entries dynamic, please also | |
99 | * update PR KVM to flush and restore them accordingly. | |
100 | */ | |
101 | static struct slb_shadow *slb_shadow; | |
102 | ||
103 | static void __init allocate_slb_shadows(int nr_cpus, int limit) | |
104 | { | |
105 | int size = PAGE_ALIGN(sizeof(struct slb_shadow) * nr_cpus); | |
106 | slb_shadow = __va(memblock_alloc_base(size, PAGE_SIZE, limit)); | |
107 | memset(slb_shadow, 0, size); | |
108 | } | |
109 | ||
110 | static struct slb_shadow * __init init_slb_shadow(int cpu) | |
111 | { | |
112 | struct slb_shadow *s = &slb_shadow[cpu]; | |
113 | ||
114 | /* | |
115 | * When we come through here to initialise boot_paca, the slb_shadow | |
116 | * buffers are not allocated yet. That's OK, we'll get one later in | |
117 | * boot, but make sure we don't corrupt memory at 0. | |
118 | */ | |
119 | if (!slb_shadow) | |
120 | return NULL; | |
121 | ||
122 | s->persistent = cpu_to_be32(SLB_NUM_BOLTED); | |
123 | s->buffer_length = cpu_to_be32(sizeof(*s)); | |
124 | ||
125 | return s; | |
126 | } | |
127 | ||
128 | #else /* CONFIG_PPC_STD_MMU_64 */ | |
129 | ||
130 | static void __init allocate_slb_shadows(int nr_cpus, int limit) { } | |
131 | ||
132 | #endif /* CONFIG_PPC_STD_MMU_64 */ | |
133 | ||
134 | /* The Paca is an array with one entry per processor. Each contains an | |
135 | * lppaca, which contains the information shared between the | |
136 | * hypervisor and Linux. | |
137 | * On systems with hardware multi-threading, there are two threads | |
138 | * per processor. The Paca array must contain an entry for each thread. | |
139 | * The VPD Areas will give a max logical processors = 2 * max physical | |
140 | * processors. The processor VPD array needs one entry per physical | |
141 | * processor (not thread). | |
142 | */ | |
143 | struct paca_struct *paca; | |
144 | EXPORT_SYMBOL(paca); | |
145 | ||
146 | void __init initialise_paca(struct paca_struct *new_paca, int cpu) | |
147 | { | |
148 | #ifdef CONFIG_PPC_BOOK3S | |
149 | new_paca->lppaca_ptr = new_lppaca(cpu); | |
150 | #else | |
151 | new_paca->kernel_pgd = swapper_pg_dir; | |
152 | #endif | |
153 | new_paca->lock_token = 0x8000; | |
154 | new_paca->paca_index = cpu; | |
155 | new_paca->kernel_toc = kernel_toc_addr(); | |
156 | new_paca->kernelbase = (unsigned long) _stext; | |
157 | /* Only set MSR:IR/DR when MMU is initialized */ | |
158 | new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR); | |
159 | new_paca->hw_cpu_id = 0xffff; | |
160 | new_paca->kexec_state = KEXEC_STATE_NONE; | |
161 | new_paca->__current = &init_task; | |
162 | new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL; | |
163 | #ifdef CONFIG_PPC_STD_MMU_64 | |
164 | new_paca->slb_shadow_ptr = init_slb_shadow(cpu); | |
165 | #endif /* CONFIG_PPC_STD_MMU_64 */ | |
166 | ||
167 | #ifdef CONFIG_PPC_BOOK3E | |
168 | /* For now -- if we have threads this will be adjusted later */ | |
169 | new_paca->tcd_ptr = &new_paca->tcd; | |
170 | #endif | |
171 | } | |
172 | ||
173 | /* Put the paca pointer into r13 and SPRG_PACA */ | |
174 | void setup_paca(struct paca_struct *new_paca) | |
175 | { | |
176 | /* Setup r13 */ | |
177 | local_paca = new_paca; | |
178 | ||
179 | #ifdef CONFIG_PPC_BOOK3E | |
180 | /* On Book3E, initialize the TLB miss exception frames */ | |
181 | mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); | |
182 | #else | |
183 | /* In HV mode, we setup both HPACA and PACA to avoid problems | |
184 | * if we do a GET_PACA() before the feature fixups have been | |
185 | * applied | |
186 | */ | |
187 | if (early_cpu_has_feature(CPU_FTR_HVMODE)) | |
188 | mtspr(SPRN_SPRG_HPACA, local_paca); | |
189 | #endif | |
190 | mtspr(SPRN_SPRG_PACA, local_paca); | |
191 | ||
192 | } | |
193 | ||
194 | static int __initdata paca_size; | |
195 | ||
196 | void __init allocate_pacas(void) | |
197 | { | |
198 | u64 limit; | |
199 | int cpu; | |
200 | ||
201 | limit = ppc64_rma_size; | |
202 | ||
203 | #ifdef CONFIG_PPC_BOOK3S_64 | |
204 | /* | |
205 | * We can't take SLB misses on the paca, and we want to access them | |
206 | * in real mode, so allocate them within the RMA and also within | |
207 | * the first segment. | |
208 | */ | |
209 | limit = min(0x10000000ULL, limit); | |
210 | #endif | |
211 | ||
212 | paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); | |
213 | ||
214 | paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit)); | |
215 | memset(paca, 0, paca_size); | |
216 | ||
217 | printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n", | |
218 | paca_size, nr_cpu_ids, paca); | |
219 | ||
220 | allocate_lppacas(nr_cpu_ids, limit); | |
221 | ||
222 | allocate_slb_shadows(nr_cpu_ids, limit); | |
223 | ||
224 | /* Can't use for_each_*_cpu, as they aren't functional yet */ | |
225 | for (cpu = 0; cpu < nr_cpu_ids; cpu++) | |
226 | initialise_paca(&paca[cpu], cpu); | |
227 | } | |
228 | ||
229 | void __init free_unused_pacas(void) | |
230 | { | |
231 | int new_size; | |
232 | ||
233 | new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids); | |
234 | ||
235 | if (new_size >= paca_size) | |
236 | return; | |
237 | ||
238 | memblock_free(__pa(paca) + new_size, paca_size - new_size); | |
239 | ||
240 | printk(KERN_DEBUG "Freed %u bytes for unused pacas\n", | |
241 | paca_size - new_size); | |
242 | ||
243 | paca_size = new_size; | |
244 | ||
245 | free_lppacas(); | |
246 | } |