arch/x86/lib/fsp/fsp_support.c

   1 /*
   2  * Copyright (C) 2013, Intel Corporation
   3  * Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com>
   4  *
   5  * SPDX-License-Identifier:     Intel
   6  */
   7
   8 #include <common.h>
   9 #include <asm/fsp/fsp_support.h>
  10 #include <asm/post.h>
  11
  12 /**
  13  * Compares two GUIDs
  14  *
  15  * If the GUIDs are identical then true is returned.
  16  * If there are any bit differences in the two GUIDs, then false is returned.
  17  *
  18  * @guid1:        A pointer to a 128 bit GUID.
  19  * @guid2:        A pointer to a 128 bit GUID.
  20  *
  21  * @retval true:  guid1 and guid2 are identical.
  22  * @retval false: guid1 and guid2 are not identical.
  23  */
  24 static bool compare_guid(const struct efi_guid *guid1,
  25                          const struct efi_guid *guid2)
  26 {
  27         if (memcmp(guid1, guid2, sizeof(struct efi_guid)) == 0)
  28                 return true;
  29         else
  30                 return false;
  31 }
  32
  33 struct fsp_header *__attribute__((optimize("O0"))) find_fsp_header(void)
  34 {
  35         /*
  36          * This function may be called before the a stack is established,
  37          * so special care must be taken. First, it cannot declare any local
  38          * variable using stack. Only register variable can be used here.
  39          * Secondly, some compiler version will add prolog or epilog code
  40          * for the C function. If so the function call may not work before
  41          * stack is ready.
  42          *
  43          * GCC 4.8.1 has been verified to be working for the following codes.
  44          */
  45         volatile register u8 *fsp asm("eax");
  46
  47         /* Initalize the FSP base */
  48         fsp = (u8 *)CONFIG_FSP_ADDR;
  49
  50         /* Check the FV signature, _FVH */
  51         if (((struct fv_header *)fsp)->sign == EFI_FVH_SIGNATURE) {
  52                 /* Go to the end of the FV header and align the address */
  53                 fsp += ((struct fv_header *)fsp)->ext_hdr_off;
  54                 fsp += ((struct fv_ext_header *)fsp)->ext_hdr_size;
  55                 fsp  = (u8 *)(((u32)fsp + 7) & 0xFFFFFFF8);
  56         } else {
  57                 fsp  = 0;
  58         }
  59
  60         /* Check the FFS GUID */
  61         if (fsp &&
  62             ((struct ffs_file_header *)fsp)->name.data1 == FSP_GUID_DATA1 &&
  63             ((struct ffs_file_header *)fsp)->name.data2 == FSP_GUID_DATA2 &&
  64             ((struct ffs_file_header *)fsp)->name.data3 == FSP_GUID_DATA3 &&
  65             ((struct ffs_file_header *)fsp)->name.data4[0] == FSP_GUID_DATA4_0 &&
  66             ((struct ffs_file_header *)fsp)->name.data4[1] == FSP_GUID_DATA4_1 &&
  67             ((struct ffs_file_header *)fsp)->name.data4[2] == FSP_GUID_DATA4_2 &&
  68             ((struct ffs_file_header *)fsp)->name.data4[3] == FSP_GUID_DATA4_3 &&
  69             ((struct ffs_file_header *)fsp)->name.data4[4] == FSP_GUID_DATA4_4 &&
  70             ((struct ffs_file_header *)fsp)->name.data4[5] == FSP_GUID_DATA4_5 &&
  71             ((struct ffs_file_header *)fsp)->name.data4[6] == FSP_GUID_DATA4_6 &&
  72             ((struct ffs_file_header *)fsp)->name.data4[7] == FSP_GUID_DATA4_7) {
  73                 /* Add the FFS header size to find the raw section header */
  74                 fsp += sizeof(struct ffs_file_header);
  75         } else {
  76                 fsp = 0;
  77         }
  78
  79         if (fsp &&
  80             ((struct raw_section *)fsp)->type == EFI_SECTION_RAW) {
  81                 /* Add the raw section header size to find the FSP header */
  82                 fsp += sizeof(struct raw_section);
  83         } else {
  84                 fsp = 0;
  85         }
  86
  87         return (struct fsp_header *)fsp;
  88 }
  89
  90 void fsp_continue(struct shared_data *shared_data, u32 status, void *hob_list)
  91 {
  92         u32 stack_len;
  93         u32 stack_base;
  94         u32 stack_top;
  95
  96         post_code(POST_MRC);
  97
  98         assert(status == 0);
  99
 100         /* Get the migrated stack in normal memory */
 101         stack_base = (u32)fsp_get_bootloader_tmp_mem(hob_list, &stack_len);
 102         assert(stack_base != 0);
 103         stack_top  = stack_base + stack_len - sizeof(u32);
 104
 105         /*
 106          * Old stack base is stored at the very end of the stack top,
 107          * use it to calculate the migrated shared data base
 108          */
 109         shared_data = (struct shared_data *)(stack_base +
 110                         ((u32)shared_data - *(u32 *)stack_top));
 111
 112         /* The boot loader main function entry */
 113         fsp_init_done(hob_list);
 114 }
 115
 116 void fsp_init(u32 stack_top, u32 boot_mode, void *nvs_buf)
 117 {
 118         struct shared_data shared_data;
 119         fsp_init_f init;
 120         struct fsp_init_params params;
 121         struct fspinit_rtbuf rt_buf;
 122         struct vpd_region *fsp_vpd;
 123         struct fsp_header *fsp_hdr;
 124         struct fsp_init_params *params_ptr;
 125         struct upd_region *fsp_upd;
 126
 127 #ifdef CONFIG_DEBUG_UART
 128         setup_early_uart();
 129 #endif
 130
 131         fsp_hdr = find_fsp_header();
 132         if (fsp_hdr == NULL) {
 133                 /* No valid FSP info header was found */
 134                 panic("Invalid FSP header");
 135         }
 136
 137         fsp_upd = &shared_data.fsp_upd;
 138         memset(&rt_buf, 0, sizeof(struct fspinit_rtbuf));
 139
 140         /* Reserve a gap in stack top */
 141         rt_buf.common.stack_top = (u32 *)stack_top - 32;
 142         rt_buf.common.boot_mode = boot_mode;
 143         rt_buf.common.upd_data = fsp_upd;
 144
 145         /* Get VPD region start */
 146         fsp_vpd = (struct vpd_region *)(fsp_hdr->img_base +
 147                         fsp_hdr->cfg_region_off);
 148
 149         /* Verify the VPD data region is valid */
 150         assert((fsp_vpd->img_rev == VPD_IMAGE_REV) &&
 151                (fsp_vpd->sign == VPD_IMAGE_ID));
 152
 153         /* Copy default data from Flash */
 154         memcpy(fsp_upd, (void *)(fsp_hdr->img_base + fsp_vpd->upd_offset),
 155                sizeof(struct upd_region));
 156
 157         /* Verify the UPD data region is valid */
 158         assert(fsp_upd->terminator == UPD_TERMINATOR);
 159
 160         /* Override any UPD setting if required */
 161         update_fsp_upd(fsp_upd);
 162
 163         memset(&params, 0, sizeof(struct fsp_init_params));
 164         params.nvs_buf = nvs_buf;
 165         params.rt_buf = (struct fspinit_rtbuf *)&rt_buf;
 166         params.continuation = (fsp_continuation_f)asm_continuation;
 167
 168         init = (fsp_init_f)(fsp_hdr->img_base + fsp_hdr->fsp_init);
 169         params_ptr = &params;
 170
 171         shared_data.fsp_hdr = fsp_hdr;
 172         shared_data.stack_top = (u32 *)stack_top;
 173
 174         post_code(POST_PRE_MRC);
 175
 176         /*
 177          * Use ASM code to ensure the register value in EAX & ECX
 178          * will be passed into BlContinuationFunc
 179          */
 180         asm volatile (
 181                 "pushl  %0;"
 182                 "call   *%%eax;"
 183                 ".global asm_continuation;"
 184                 "asm_continuation:;"
 185                 "movl   %%ebx, %%eax;"          /* shared_data */
 186                 "movl   4(%%esp), %%edx;"       /* status */
 187                 "movl   8(%%esp), %%ecx;"       /* hob_list */
 188                 "jmp    fsp_continue;"
 189                 : : "m"(params_ptr), "a"(init), "b"(&shared_data)
 190         );
 191
 192         /*
 193          * Should never get here.
 194          * Control will continue from fsp_continue.
 195          * This line below is to prevent the compiler from optimizing
 196          * structure intialization.
 197          *
 198          * DO NOT REMOVE!
 199          */
 200         init(&params);
 201 }
 202
 203 u32 fsp_notify(struct fsp_header *fsp_hdr, u32 phase)
 204 {
 205         fsp_notify_f notify;
 206         struct fsp_notify_params params;
 207         struct fsp_notify_params *params_ptr;
 208         u32 status;
 209
 210         if (!fsp_hdr)
 211                 fsp_hdr = (struct fsp_header *)find_fsp_header();
 212
 213         if (fsp_hdr == NULL) {
 214                 /* No valid FSP info header */
 215                 panic("Invalid FSP header");
 216         }
 217
 218         notify = (fsp_notify_f)(fsp_hdr->img_base + fsp_hdr->fsp_notify);
 219         params.phase = phase;
 220         params_ptr = &params;
 221
 222         /*
 223          * Use ASM code to ensure correct parameter is on the stack for
 224          * FspNotify as U-Boot is using different ABI from FSP
 225          */
 226         asm volatile (
 227                 "pushl  %1;"            /* push notify phase */
 228                 "call   *%%eax;"        /* call FspNotify */
 229                 "addl   $4, %%esp;"     /* clean up the stack */
 230                 : "=a"(status) : "m"(params_ptr), "a"(notify), "m"(*params_ptr)
 231         );
 232
 233         return status;
 234 }
 235
 236 u32 fsp_get_usable_lowmem_top(const void *hob_list)
 237 {
 238         const struct hob_header *hdr;
 239         struct hob_res_desc *res_desc;
 240         phys_addr_t phys_start;
 241         u32 top;
 242
 243         /* Get the HOB list for processing */
 244         hdr = hob_list;
 245
 246         /* * Collect memory ranges */
 247         top = FSP_LOWMEM_BASE;
 248         while (!end_of_hob(hdr)) {
 249                 if (hdr->type == HOB_TYPE_RES_DESC) {
 250                         res_desc = (struct hob_res_desc *)hdr;
 251                         if (res_desc->type == RES_SYS_MEM) {
 252                                 phys_start = res_desc->phys_start;
 253                                 /* Need memory above 1MB to be collected here */
 254                                 if (phys_start >= FSP_LOWMEM_BASE &&
 255                                     phys_start < (phys_addr_t)FSP_HIGHMEM_BASE)
 256                                         top += (u32)(res_desc->len);
 257                         }
 258                 }
 259                 hdr = get_next_hob(hdr);
 260         }
 261
 262         return top;
 263 }
 264
 265 u64 fsp_get_usable_highmem_top(const void *hob_list)
 266 {
 267         const struct hob_header *hdr;
 268         struct hob_res_desc *res_desc;
 269         phys_addr_t phys_start;
 270         u64 top;
 271
 272         /* Get the HOB list for processing */
 273         hdr = hob_list;
 274
 275         /* Collect memory ranges */
 276         top = FSP_HIGHMEM_BASE;
 277         while (!end_of_hob(hdr)) {
 278                 if (hdr->type == HOB_TYPE_RES_DESC) {
 279                         res_desc = (struct hob_res_desc *)hdr;
 280                         if (res_desc->type == RES_SYS_MEM) {
 281                                 phys_start = res_desc->phys_start;
 282                                 /* Need memory above 4GB to be collected here */
 283                                 if (phys_start >= (phys_addr_t)FSP_HIGHMEM_BASE)
 284                                         top += (u32)(res_desc->len);
 285                         }
 286                 }
 287                 hdr = get_next_hob(hdr);
 288         }
 289
 290         return top;
 291 }
 292
 293 u64 fsp_get_reserved_mem_from_guid(const void *hob_list, u64 *len,
 294                                    struct efi_guid *guid)
 295 {
 296         const struct hob_header *hdr;
 297         struct hob_res_desc *res_desc;
 298
 299         /* Get the HOB list for processing */
 300         hdr = hob_list;
 301
 302         /* Collect memory ranges */
 303         while (!end_of_hob(hdr)) {
 304                 if (hdr->type == HOB_TYPE_RES_DESC) {
 305                         res_desc = (struct hob_res_desc *)hdr;
 306                         if (res_desc->type == RES_MEM_RESERVED) {
 307                                 if (compare_guid(&res_desc->owner, guid)) {
 308                                         if (len)
 309                                                 *len = (u32)(res_desc->len);
 310
 311                                         return (u64)(res_desc->phys_start);
 312                                 }
 313                         }
 314                 }
 315                 hdr = get_next_hob(hdr);
 316         }
 317
 318         return 0;
 319 }
 320
 321 u32 fsp_get_fsp_reserved_mem(const void *hob_list, u32 *len)
 322 {
 323         const struct efi_guid guid = FSP_HOB_RESOURCE_OWNER_FSP_GUID;
 324         u64 length;
 325         u32 base;
 326
 327         base = (u32)fsp_get_reserved_mem_from_guid(hob_list,
 328                         &length, (struct efi_guid *)&guid);
 329         if ((len != 0) && (base != 0))
 330                 *len = (u32)length;
 331
 332         return base;
 333 }
 334
 335 u32 fsp_get_tseg_reserved_mem(const void *hob_list, u32 *len)
 336 {
 337         const struct efi_guid guid = FSP_HOB_RESOURCE_OWNER_TSEG_GUID;
 338         u64 length;
 339         u32 base;
 340
 341         base = (u32)fsp_get_reserved_mem_from_guid(hob_list,
 342                         &length, (struct efi_guid *)&guid);
 343         if ((len != 0) && (base != 0))
 344                 *len = (u32)length;
 345
 346         return base;
 347 }
 348
 349 const struct hob_header *fsp_get_next_hob(uint type, const void *hob_list)
 350 {
 351         const struct hob_header *hdr;
 352
 353         hdr = hob_list;
 354
 355         /* Parse the HOB list until end of list or matching type is found */
 356         while (!end_of_hob(hdr)) {
 357                 if (hdr->type == type)
 358                         return hdr;
 359
 360                 hdr = get_next_hob(hdr);
 361         }
 362
 363         return NULL;
 364 }
 365
 366 const struct hob_header *fsp_get_next_guid_hob(const struct efi_guid *guid,
 367                                                const void *hob_list)
 368 {
 369         const struct hob_header *hdr;
 370         struct hob_guid *guid_hob;
 371
 372         hdr = hob_list;
 373         while ((hdr = fsp_get_next_hob(HOB_TYPE_GUID_EXT,
 374                         hdr)) != NULL) {
 375                 guid_hob = (struct hob_guid *)hdr;
 376                 if (compare_guid(guid, &(guid_hob->name)))
 377                         break;
 378                 hdr = get_next_hob(hdr);
 379         }
 380
 381         return hdr;
 382 }
 383
 384 void *fsp_get_guid_hob_data(const void *hob_list, u32 *len,
 385                             struct efi_guid *guid)
 386 {
 387         const struct hob_header *guid_hob;
 388
 389         guid_hob = fsp_get_next_guid_hob(guid, hob_list);
 390         if (guid_hob == NULL) {
 391                 return NULL;
 392         } else {
 393                 if (len)
 394                         *len = get_guid_hob_data_size(guid_hob);
 395
 396                 return get_guid_hob_data(guid_hob);
 397         }
 398 }
 399
 400 void *fsp_get_nvs_data(const void *hob_list, u32 *len)
 401 {
 402         const struct efi_guid guid = FSP_NON_VOLATILE_STORAGE_HOB_GUID;
 403
 404         return fsp_get_guid_hob_data(hob_list, len, (struct efi_guid *)&guid);
 405 }
 406
 407 void *fsp_get_bootloader_tmp_mem(const void *hob_list, u32 *len)
 408 {
 409         const struct efi_guid guid = FSP_BOOTLOADER_TEMP_MEM_HOB_GUID;
 410
 411         return fsp_get_guid_hob_data(hob_list, len, (struct efi_guid *)&guid);
 412 }