stage2/mm.c

   1 /*  mm.c - memory management
   2
   3 Copyright (C) 2010-2011  Hector Martin "marcan" <hector@marcansoft.com>
   4
   5 This code is licensed to you under the terms of the GNU GPL, version 2;
   6 see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
   7 */
   8
   9 #include "types.h"
  10 #include "debug.h"
  11 #include "mm.h"
  12 #include "lv1call.h"
  13 #include "string.h"
  14 #include "repo.h"
  15
  16 #define MSR_IR (1UL<<5)
  17 #define MSR_DR (1UL<<4)
  18
  19 #define NUM_SLB 64
  20
  21 int seg_idx = 1;
  22 u64 vas_id;
  23
  24 #define NUM_MMIO 128
  25
  26 int mm_inited = 0;
  27
  28 // highmem size is aligned to 16MB blocks
  29 #define HIGHMEM_PBITS 24
  30 #define HIGHMEM_PALIGN (1<<HIGHMEM_PBITS)
  31
  32 // highmem pointer is aligned to 64kB
  33 #define HIGHMEM_ALIGN 65536
  34
  35 u64 mm_bootmem_size;
  36 u64 mm_highmem_addr;
  37 u64 mm_highmem_size;
  38
  39 static u64 highmem_ptr;
  40
  41 struct mmio_region {
  42         u64 start;
  43         u32 end;
  44 };
  45
  46 struct mmio_region mmios[NUM_MMIO];
  47
  48 int mm_addmmio(u64 start, u32 size)
  49 {
  50         int i;
  51         u64 end = start+size;
  52
  53         if (!size)
  54                 return -1;
  55
  56         if ((start & 0xfff) || (end & 0xfff)) {
  57                 printf("WARNING: MMIO region is not aligned (0x%016lx 0x%x)", start, size);
  58                 start &= ~0xfff;
  59                 start = (start+0xfff)&~0xfff;
  60         }
  61
  62         if (!start)
  63                 return -1;
  64
  65         for (i=0; i<NUM_MMIO; i++) {
  66                 if (mmios[i].start == 0) {
  67                         mmios[i].start = start;
  68                         mmios[i].end = end;
  69                         return 0;
  70                 }
  71         }
  72         printf("WARNING: Maximum number of MMIO regions exceeded\n");
  73         return -1;
  74 }
  75
  76 int mm_delmmio(u64 start)
  77 {
  78         int i;
  79         start &= ~0xfff;
  80         for (i=0; i<NUM_MMIO; i++) {
  81                 if (mmios[i].start == start) {
  82                         mmios[i].start = 0;
  83                         mmios[i].end = 0;
  84                         return 0;
  85                 }
  86         }
  87         printf("WARNING: Tried to delete nonexistent MMIO region 0x%016lx\n", start);
  88         return -1;
  89 }
  90
  91 int mm_clrmmio(void)
  92 {
  93         memset(mmios, 0, sizeof(mmios));
  94         return 0;
  95 }
  96
  97 int mm_ismmio(u64 addr)
  98 {
  99         int i;
 100         for (i=0; i<NUM_MMIO; i++) {
 101                 if (mmios[i].start <= addr && mmios[i].end > addr)
 102                         return 1;
 103         }
 104         return 0;
 105 }
 106
 107 int mm_loadseg(u64 addr)
 108 {
 109         if (!mm_inited)
 110                 return 0;
 111         u64 esid = addr >> 28;
 112
 113         int index = 0;
 114
 115         if (esid) {
 116                 index = seg_idx;
 117                 seg_idx++;
 118                 if (seg_idx >= NUM_SLB)
 119                         seg_idx = 1;
 120         }
 121
 122         u64 rs, rb;
 123
 124         rs = (esid<<12) | 0x400;
 125         rb = (esid<<28) | (1<<27) | index;
 126
 127         asm("slbmte %0,%1 ; isync" :: "r"(rs), "r"(rb));
 128         printf("SLB[%d] = %016lx %016lx (caused by %016lx)\n", index, rs, rb, addr);
 129         return 1;
 130 }
 131
 132 int mm_loadhtab(u64 addr)
 133 {
 134         if (!mm_inited)
 135                 return 0;
 136         s64 result;
 137
 138         //printf("Load HTAB for %016lx\n", addr);
 139
 140         addr &= ~0xfff;
 141
 142         u32 wimg = 0x2;
 143         if (mm_ismmio(addr)) {
 144                 wimg = 0x5;
 145         }
 146
 147         u64 hpte_v;
 148         u64 hpte_r;
 149         u64 inserted_index, evicted_v, evicted_r;
 150
 151         hpte_v = (addr>>23)<<7;
 152         hpte_v |= 0x1;
 153         hpte_r = addr|(wimg<<3);
 154
 155         u64 htab_hash_mask = ((256*1024)>>7)-1;
 156
 157         u64 hash = (addr >> 28) ^ ((addr & 0x0fffffffUL) >> 12);
 158         u64 hpte_group = ((hash & htab_hash_mask) * 8);
 159
 160         result = lv1_insert_htab_entry(0, hpte_group,
 161                                        hpte_v, hpte_r,
 162                                        0x10, 0,
 163                                        &inserted_index,
 164                                        &evicted_v, &evicted_r);
 165         if (result) {
 166                 printf("Failed to insert HTAB entry:\n");
 167                 printf("hpte_group=0x%lx hpte_v=0x%016lx hpte_r=0x%016lx\n", hpte_group, hpte_v, hpte_r);
 168                 printf("result=%ld inserted_index=%lx evicted_v=%lx evicted_r=%lx\n", result, inserted_index, evicted_v, evicted_r);
 169                 return 0;
 170         } else {
 171                 return 1;
 172         }
 173 }
 174
 175 void mm_init(void)
 176 {
 177         s32 result;
 178
 179         printf("Initializing memory management...\n");
 180
 181         memset(mmios, 0, sizeof(mmios));
 182         u64 act_htab_size;
 183         result = lv1_construct_virtual_address_space(18, 0, 0, &vas_id, &act_htab_size);
 184         if (result)
 185                 fatal("Could not construct VAS\n");
 186         printf("New VAS ID: %ld\n", vas_id);
 187
 188         result = lv1_select_virtual_address_space(vas_id);
 189         if (result)
 190                 fatal("Could not switch VAS\n");
 191
 192         mm_inited = 1;
 193
 194         asm("slbia");
 195         mm_loadseg(0);
 196
 197         u64 msr;
 198         asm("mfmsr %0" : "=r"(msr));
 199         msr |= MSR_IR | MSR_DR;
 200         asm("isync ; mtmsrd %0,0 ; isync" :: "r"(msr));
 201
 202         printf("MMU initialized, now running in virtual mode\n");
 203
 204         u64 ppe_id, lpar_id;
 205
 206         result = lv1_get_logical_ppe_id(&ppe_id);
 207         if (result)
 208                 fatal("could not get PPE ID");
 209
 210         result = lv1_get_logical_partition_id(&lpar_id);
 211         if (result)
 212                 fatal("could not get LPAR ID");
 213
 214         u64 rm_size, rgntotal, v2;
 215
 216         result = lv1_read_repository_node(lpar_id, FIELD_FIRST("bi",0),
 217                                         FIELD("pu",0), ppe_id, FIELD("rm_size",0),
 218                                         &rm_size, &v2);
 219         if (result)
 220                 fatal("could not get bootmem size");
 221
 222         result = lv1_read_repository_node(lpar_id, FIELD_FIRST("bi",0),
 223                                         FIELD("rgntotal",0), 0, 0, &rgntotal, &v2);
 224         if (result)
 225                 fatal("could not get total region size");
 226
 227         printf("Region size = %ld bytes (%ldMB)\n", rgntotal, rgntotal>>20);
 228         printf("Bootmem = %ld bytes (%ldMB)\n", rm_size, rm_size>>20);
 229
 230         mm_bootmem_size = rm_size;
 231
 232         u64 exp_size = rgntotal - rm_size;
 233         exp_size &= ~(HIGHMEM_PALIGN-1);
 234
 235         while (exp_size) {
 236                 u64 muid, addr;
 237                 result = lv1_allocate_memory(exp_size, HIGHMEM_PBITS, 0, 0, &addr, &muid);
 238                 if (result == 0) {
 239                         mm_highmem_addr = addr;
 240                         mm_highmem_size = exp_size;
 241                         break;
 242                 } else {
 243                         printf("Allocation of %ld bytes failed (%d), trying again...\n", exp_size, result);
 244                         exp_size -= HIGHMEM_PALIGN;
 245                 }
 246         }
 247
 248         if (!exp_size)
 249                 fatal("could not allocate highmem");
 250
 251         highmem_ptr = mm_highmem_addr;
 252
 253         printf("Highmem = %ld bytes (%ldMB) at 0x%lx\n", mm_highmem_size, mm_highmem_size>>20, mm_highmem_addr);
 254 }
 255
 256 void mm_shutdown_highmem(void)
 257 {
 258         s32 result;
 259
 260         printf("Freeing highmem...\n");
 261         result = lv1_release_memory(mm_highmem_addr);
 262
 263         if (result)
 264                 fatal("could not free highmem");
 265
 266         printf("Highmem is gone\n");
 267 }
 268
 269 void mm_shutdown(void)
 270 {
 271         s64 result;
 272         printf("Shutting down memory management...\n");
 273
 274         u64 msr;
 275         asm("mfmsr %0" : "=r"(msr));
 276         msr &= ~(MSR_IR | MSR_DR);
 277         asm("mtmsrd %0,0 ; isync" :: "r"(msr));
 278
 279         printf("Now running in real mode\n");
 280
 281         result = lv1_select_virtual_address_space(0);
 282         if (result)
 283                 fatal("Could not switch to VAS 0\n");
 284
 285         result = lv1_destruct_virtual_address_space(vas_id);
 286         if (result)
 287                 fatal("Could not destroy VAS\n");
 288
 289         printf("Destroyed VAS %ld\n", vas_id);
 290         vas_id = 0;
 291
 292         mm_inited = 0;
 293 }
 294
 295 void mm_highmem_reserve(size_t size)
 296 {
 297         if (size > mm_highmem_freesize())
 298                 fatal("mm_highmem_reserve: too large");
 299
 300         highmem_ptr += size + HIGHMEM_ALIGN - 1;
 301         highmem_ptr &= ~(HIGHMEM_ALIGN-1);
 302 }
 303
 304 void *mm_highmem_freestart(void)
 305 {
 306         return (void*)highmem_ptr;
 307 }
 308
 309 size_t mm_highmem_freesize(void)
 310 {
 311         return mm_highmem_addr + mm_highmem_size - highmem_ptr;
 312 }
 313
 314 u64 mm_addr_to_kernel(void *addr)
 315 {
 316         u64 a = (u64)addr;
 317
 318         if (a > mm_bootmem_size)
 319                 if (a >= mm_highmem_addr && a < (mm_highmem_addr+mm_highmem_size))
 320                         return a - mm_highmem_addr + mm_bootmem_size;
 321                 else
 322                         fatal("mm_addr_to_kernel: out of bounds");
 323         else
 324                 return a;
 325 }
 326
 327 void sync_before_exec(void *addr, int len)
 328 {
 329         u64 p = ((u64)addr) & ~0x1f;
 330         u64 end = ((u64)addr) + len;
 331
 332         while (p < end) {
 333                 asm("dcbst 0,%0 ; sync ; icbi 0,%0" :: "r"(p));
 334                 p += 32;
 335         }
 336
 337         asm("sync ; isync");
 338 }