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 } 247