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10#include <linux/threads.h>
11#include <linux/module.h>
12#include <linux/memblock.h>
13
14#include <asm/firmware.h>
15#include <asm/lppaca.h>
16#include <asm/paca.h>
17#include <asm/sections.h>
18#include <asm/pgtable.h>
19#include <asm/iseries/lpar_map.h>
20#include <asm/iseries/hv_types.h>
21#include <asm/kexec.h>
22
23
24
25extern unsigned long __toc_start;
26
27#ifdef CONFIG_PPC_BOOK3S
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38struct lppaca lppaca[] = {
39 [0 ... (NR_LPPACAS-1)] = {
40 .desc = 0xd397d781,
41 .size = sizeof(struct lppaca),
42 .dyn_proc_status = 2,
43 .decr_val = 0x00ff0000,
44 .fpregs_in_use = 1,
45 .end_of_quantum = 0xfffffffffffffffful,
46 .slb_count = 64,
47 .vmxregs_in_use = 0,
48 .page_ins = 0,
49 },
50};
51
52static struct lppaca *extra_lppacas;
53static long __initdata lppaca_size;
54
55static void allocate_lppacas(int nr_cpus, unsigned long limit)
56{
57 if (nr_cpus <= NR_LPPACAS)
58 return;
59
60 lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) *
61 (nr_cpus - NR_LPPACAS));
62 extra_lppacas = __va(memblock_alloc_base(lppaca_size,
63 PAGE_SIZE, limit));
64}
65
66static struct lppaca *new_lppaca(int cpu)
67{
68 struct lppaca *lp;
69
70 if (cpu < NR_LPPACAS)
71 return &lppaca[cpu];
72
73 lp = extra_lppacas + (cpu - NR_LPPACAS);
74 *lp = lppaca[0];
75
76 return lp;
77}
78
79static void free_lppacas(void)
80{
81 long new_size = 0, nr;
82
83 if (!lppaca_size)
84 return;
85 nr = num_possible_cpus() - NR_LPPACAS;
86 if (nr > 0)
87 new_size = PAGE_ALIGN(nr * sizeof(struct lppaca));
88 if (new_size >= lppaca_size)
89 return;
90
91 memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size);
92 lppaca_size = new_size;
93}
94
95#else
96
97static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { }
98static inline void free_lppacas(void) { }
99
100#endif
101
102#ifdef CONFIG_PPC_STD_MMU_64
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108struct slb_shadow slb_shadow[] __cacheline_aligned = {
109 [0 ... (NR_CPUS-1)] = {
110 .persistent = SLB_NUM_BOLTED,
111 .buffer_length = sizeof(struct slb_shadow),
112 },
113};
114
115#endif
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126struct paca_struct *paca;
127EXPORT_SYMBOL(paca);
128
129struct paca_struct boot_paca;
130
131void __init initialise_paca(struct paca_struct *new_paca, int cpu)
132{
133
134
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136 unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL;
137
138#ifdef CONFIG_PPC_BOOK3S
139 new_paca->lppaca_ptr = new_lppaca(cpu);
140#else
141 new_paca->kernel_pgd = swapper_pg_dir;
142#endif
143 new_paca->lock_token = 0x8000;
144 new_paca->paca_index = cpu;
145 new_paca->kernel_toc = kernel_toc;
146 new_paca->kernelbase = (unsigned long) _stext;
147 new_paca->kernel_msr = MSR_KERNEL;
148 new_paca->hw_cpu_id = 0xffff;
149 new_paca->kexec_state = KEXEC_STATE_NONE;
150 new_paca->__current = &init_task;
151#ifdef CONFIG_PPC_STD_MMU_64
152 new_paca->slb_shadow_ptr = &slb_shadow[cpu];
153#endif
154}
155
156
157void setup_paca(struct paca_struct *new_paca)
158{
159 local_paca = new_paca;
160 mtspr(SPRN_SPRG_PACA, local_paca);
161#ifdef CONFIG_PPC_BOOK3E
162 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
163#endif
164}
165
166static int __initdata paca_size;
167
168void __init allocate_pacas(void)
169{
170 int nr_cpus, cpu, limit;
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178 limit = min(0x10000000ULL, ppc64_rma_size);
179 if (firmware_has_feature(FW_FEATURE_ISERIES))
180 limit = min(limit, HvPagesToMap * HVPAGESIZE);
181
182 nr_cpus = NR_CPUS;
183
184 if (firmware_has_feature(FW_FEATURE_ISERIES))
185 nr_cpus = min(64, nr_cpus);
186
187 paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpus);
188
189 paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
190 memset(paca, 0, paca_size);
191
192 printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
193 paca_size, nr_cpus, paca);
194
195 allocate_lppacas(nr_cpus, limit);
196
197
198 for (cpu = 0; cpu < nr_cpus; cpu++)
199 initialise_paca(&paca[cpu], cpu);
200}
201
202void __init free_unused_pacas(void)
203{
204 int new_size;
205
206 new_size = PAGE_ALIGN(sizeof(struct paca_struct) * num_possible_cpus());
207
208 if (new_size >= paca_size)
209 return;
210
211 memblock_free(__pa(paca) + new_size, paca_size - new_size);
212
213 printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
214 paca_size - new_size);
215
216 paca_size = new_size;
217
218 free_lppacas();
219}
220