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Annotation of qemu/hw/multiboot.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * QEMU PC System Emulator
        !             3:  *
        !             4:  * Copyright (c) 2003-2004 Fabrice Bellard
        !             5:  *
        !             6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
        !             7:  * of this software and associated documentation files (the "Software"), to deal
        !             8:  * in the Software without restriction, including without limitation the rights
        !             9:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
        !            10:  * copies of the Software, and to permit persons to whom the Software is
        !            11:  * furnished to do so, subject to the following conditions:
        !            12:  *
        !            13:  * The above copyright notice and this permission notice shall be included in
        !            14:  * all copies or substantial portions of the Software.
        !            15:  *
        !            16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
        !            17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
        !            19:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        !            20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
        !            21:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
        !            22:  * THE SOFTWARE.
        !            23:  */
        !            24: 
        !            25: #include "hw.h"
        !            26: #include "fw_cfg.h"
        !            27: #include "multiboot.h"
        !            28: #include "loader.h"
        !            29: #include "elf.h"
        !            30: #include "sysemu.h"
        !            31: 
        !            32: /* Show multiboot debug output */
        !            33: //#define DEBUG_MULTIBOOT
        !            34: 
        !            35: #ifdef DEBUG_MULTIBOOT
        !            36: #define mb_debug(a...) fprintf(stderr, ## a)
        !            37: #else
        !            38: #define mb_debug(a...)
        !            39: #endif
        !            40: 
        !            41: #define MULTIBOOT_STRUCT_ADDR 0x9000
        !            42: 
        !            43: #if MULTIBOOT_STRUCT_ADDR > 0xf0000
        !            44: #error multiboot struct needs to fit in 16 bit real mode
        !            45: #endif
        !            46: 
        !            47: enum {
        !            48:     /* Multiboot info */
        !            49:     MBI_FLAGS       = 0,
        !            50:     MBI_MEM_LOWER   = 4,
        !            51:     MBI_MEM_UPPER   = 8,
        !            52:     MBI_BOOT_DEVICE = 12,
        !            53:     MBI_CMDLINE     = 16,
        !            54:     MBI_MODS_COUNT  = 20,
        !            55:     MBI_MODS_ADDR   = 24,
        !            56:     MBI_MMAP_ADDR   = 48,
        !            57: 
        !            58:     MBI_SIZE        = 88,
        !            59: 
        !            60:     /* Multiboot modules */
        !            61:     MB_MOD_START    = 0,
        !            62:     MB_MOD_END      = 4,
        !            63:     MB_MOD_CMDLINE  = 8,
        !            64: 
        !            65:     MB_MOD_SIZE     = 16,
        !            66: 
        !            67:     /* Region offsets */
        !            68:     ADDR_E820_MAP = MULTIBOOT_STRUCT_ADDR + 0,
        !            69:     ADDR_MBI      = ADDR_E820_MAP + 0x500,
        !            70: 
        !            71:     /* Multiboot flags */
        !            72:     MULTIBOOT_FLAGS_MEMORY      = 1 << 0,
        !            73:     MULTIBOOT_FLAGS_BOOT_DEVICE = 1 << 1,
        !            74:     MULTIBOOT_FLAGS_CMDLINE     = 1 << 2,
        !            75:     MULTIBOOT_FLAGS_MODULES     = 1 << 3,
        !            76:     MULTIBOOT_FLAGS_MMAP        = 1 << 6,
        !            77: };
        !            78: 
        !            79: typedef struct {
        !            80:     /* buffer holding kernel, cmdlines and mb_infos */
        !            81:     void *mb_buf;
        !            82:     /* address in target */
        !            83:     target_phys_addr_t mb_buf_phys;
        !            84:     /* size of mb_buf in bytes */
        !            85:     unsigned mb_buf_size;
        !            86:     /* offset of mb-info's in bytes */
        !            87:     target_phys_addr_t offset_mbinfo;
        !            88:     /* offset in buffer for cmdlines in bytes */
        !            89:     target_phys_addr_t offset_cmdlines;
        !            90:     /* offset of modules in bytes */
        !            91:     target_phys_addr_t offset_mods;
        !            92:     /* available slots for mb modules infos */
        !            93:     int mb_mods_avail;
        !            94:     /* currently used slots of mb modules */
        !            95:     int mb_mods_count;
        !            96: } MultibootState;
        !            97: 
        !            98: static uint32_t mb_add_cmdline(MultibootState *s, const char *cmdline)
        !            99: {
        !           100:     int len = strlen(cmdline) + 1;
        !           101:     target_phys_addr_t p = s->offset_cmdlines;
        !           102: 
        !           103:     pstrcpy((char *)s->mb_buf + p, len, cmdline);
        !           104:     s->offset_cmdlines += len;
        !           105:     return s->mb_buf_phys + p;
        !           106: }
        !           107: 
        !           108: static void mb_add_mod(MultibootState *s,
        !           109:                        target_phys_addr_t start, target_phys_addr_t end,
        !           110:                        target_phys_addr_t cmdline_phys)
        !           111: {
        !           112:     char *p;
        !           113:     assert(s->mb_mods_count < s->mb_mods_avail);
        !           114: 
        !           115:     p = (char *)s->mb_buf + s->offset_mbinfo + MB_MOD_SIZE * s->mb_mods_count;
        !           116: 
        !           117:     stl_p(p + MB_MOD_START,   start);
        !           118:     stl_p(p + MB_MOD_END,     end);
        !           119:     stl_p(p + MB_MOD_CMDLINE, cmdline_phys);
        !           120: 
        !           121:     mb_debug("mod%02d: "TARGET_FMT_plx" - "TARGET_FMT_plx"\n",
        !           122:              s->mb_mods_count, start, end);
        !           123: 
        !           124:     s->mb_mods_count++;
        !           125: }
        !           126: 
        !           127: int load_multiboot(void *fw_cfg,
        !           128:                    FILE *f,
        !           129:                    const char *kernel_filename,
        !           130:                    const char *initrd_filename,
        !           131:                    const char *kernel_cmdline,
        !           132:                    int kernel_file_size,
        !           133:                    uint8_t *header)
        !           134: {
        !           135:     int i, is_multiboot = 0;
        !           136:     uint32_t flags = 0;
        !           137:     uint32_t mh_entry_addr;
        !           138:     uint32_t mh_load_addr;
        !           139:     uint32_t mb_kernel_size;
        !           140:     MultibootState mbs;
        !           141:     uint8_t bootinfo[MBI_SIZE];
        !           142:     uint8_t *mb_bootinfo_data;
        !           143: 
        !           144:     /* Ok, let's see if it is a multiboot image.
        !           145:        The header is 12x32bit long, so the latest entry may be 8192 - 48. */
        !           146:     for (i = 0; i < (8192 - 48); i += 4) {
        !           147:         if (ldl_p(header+i) == 0x1BADB002) {
        !           148:             uint32_t checksum = ldl_p(header+i+8);
        !           149:             flags = ldl_p(header+i+4);
        !           150:             checksum += flags;
        !           151:             checksum += (uint32_t)0x1BADB002;
        !           152:             if (!checksum) {
        !           153:                 is_multiboot = 1;
        !           154:                 break;
        !           155:             }
        !           156:         }
        !           157:     }
        !           158: 
        !           159:     if (!is_multiboot)
        !           160:         return 0; /* no multiboot */
        !           161: 
        !           162:     mb_debug("qemu: I believe we found a multiboot image!\n");
        !           163:     memset(bootinfo, 0, sizeof(bootinfo));
        !           164:     memset(&mbs, 0, sizeof(mbs));
        !           165: 
        !           166:     if (flags & 0x00000004) { /* MULTIBOOT_HEADER_HAS_VBE */
        !           167:         fprintf(stderr, "qemu: multiboot knows VBE. we don't.\n");
        !           168:     }
        !           169:     if (!(flags & 0x00010000)) { /* MULTIBOOT_HEADER_HAS_ADDR */
        !           170:         uint64_t elf_entry;
        !           171:         uint64_t elf_low, elf_high;
        !           172:         int kernel_size;
        !           173:         fclose(f);
        !           174:         kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
        !           175:                                &elf_low, &elf_high, 0, ELF_MACHINE, 0);
        !           176:         if (kernel_size < 0) {
        !           177:             fprintf(stderr, "Error while loading elf kernel\n");
        !           178:             exit(1);
        !           179:         }
        !           180:         mh_load_addr = elf_low;
        !           181:         mb_kernel_size = elf_high - elf_low;
        !           182:         mh_entry_addr = elf_entry;
        !           183: 
        !           184:         mbs.mb_buf = qemu_malloc(mb_kernel_size);
        !           185:         if (rom_copy(mbs.mb_buf, mh_load_addr, mb_kernel_size) != mb_kernel_size) {
        !           186:             fprintf(stderr, "Error while fetching elf kernel from rom\n");
        !           187:             exit(1);
        !           188:         }
        !           189: 
        !           190:         mb_debug("qemu: loading multiboot-elf kernel (%#x bytes) with entry %#zx\n",
        !           191:                   mb_kernel_size, (size_t)mh_entry_addr);
        !           192:     } else {
        !           193:         /* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_ADDR. */
        !           194:         uint32_t mh_header_addr = ldl_p(header+i+12);
        !           195:         mh_load_addr = ldl_p(header+i+16);
        !           196:         uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr);
        !           197: 
        !           198:         mh_entry_addr = ldl_p(header+i+28);
        !           199:         mb_kernel_size = kernel_file_size - mb_kernel_text_offset;
        !           200: 
        !           201:         /* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_VBE.
        !           202:         uint32_t mh_mode_type = ldl_p(header+i+32);
        !           203:         uint32_t mh_width = ldl_p(header+i+36);
        !           204:         uint32_t mh_height = ldl_p(header+i+40);
        !           205:         uint32_t mh_depth = ldl_p(header+i+44); */
        !           206: 
        !           207:         mb_debug("multiboot: mh_header_addr = %#x\n", mh_header_addr);
        !           208:         mb_debug("multiboot: mh_load_addr = %#x\n", mh_load_addr);
        !           209:         mb_debug("multiboot: mh_load_end_addr = %#x\n", ldl_p(header+i+20));
        !           210:         mb_debug("multiboot: mh_bss_end_addr = %#x\n", ldl_p(header+i+24));
        !           211:         mb_debug("qemu: loading multiboot kernel (%#x bytes) at %#x\n",
        !           212:                  mb_kernel_size, mh_load_addr);
        !           213: 
        !           214:         mbs.mb_buf = qemu_malloc(mb_kernel_size);
        !           215:         fseek(f, mb_kernel_text_offset, SEEK_SET);
        !           216:         if (fread(mbs.mb_buf, 1, mb_kernel_size, f) != mb_kernel_size) {
        !           217:             fprintf(stderr, "fread() failed\n");
        !           218:             exit(1);
        !           219:         }
        !           220:         fclose(f);
        !           221:     }
        !           222: 
        !           223:     mbs.mb_buf_phys = mh_load_addr;
        !           224: 
        !           225:     mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_kernel_size);
        !           226:     mbs.offset_mbinfo = mbs.mb_buf_size;
        !           227: 
        !           228:     /* Calculate space for cmdlines and mb_mods */
        !           229:     mbs.mb_buf_size += strlen(kernel_filename) + 1;
        !           230:     mbs.mb_buf_size += strlen(kernel_cmdline) + 1;
        !           231:     if (initrd_filename) {
        !           232:         const char *r = initrd_filename;
        !           233:         mbs.mb_buf_size += strlen(r) + 1;
        !           234:         mbs.mb_mods_avail = 1;
        !           235:         while ((r = strchr(r, ','))) {
        !           236:            mbs.mb_mods_avail++;
        !           237:            r++;
        !           238:         }
        !           239:         mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail;
        !           240:     }
        !           241: 
        !           242:     mbs.mb_buf_size = TARGET_PAGE_ALIGN(mbs.mb_buf_size);
        !           243: 
        !           244:     /* enlarge mb_buf to hold cmdlines and mb-info structs */
        !           245:     mbs.mb_buf          = qemu_realloc(mbs.mb_buf, mbs.mb_buf_size);
        !           246:     mbs.offset_cmdlines = mbs.offset_mbinfo + mbs.mb_mods_avail * MB_MOD_SIZE;
        !           247: 
        !           248:     if (initrd_filename) {
        !           249:         char *next_initrd;
        !           250: 
        !           251:         mbs.offset_mods = mbs.mb_buf_size;
        !           252: 
        !           253:         do {
        !           254:             char *next_space;
        !           255:             uint32_t mb_mod_length;
        !           256:             uint32_t offs = mbs.mb_buf_size;
        !           257: 
        !           258:             next_initrd = strchr(initrd_filename, ',');
        !           259:             if (next_initrd)
        !           260:                 *next_initrd = '\0';
        !           261:             /* if a space comes after the module filename, treat everything
        !           262:                after that as parameters */
        !           263:             target_phys_addr_t c = mb_add_cmdline(&mbs, initrd_filename);
        !           264:             if ((next_space = strchr(initrd_filename, ' ')))
        !           265:                 *next_space = '\0';
        !           266:             mb_debug("multiboot loading module: %s\n", initrd_filename);
        !           267:             mb_mod_length = get_image_size(initrd_filename);
        !           268:             if (mb_mod_length < 0) {
        !           269:                 fprintf(stderr, "failed to get %s image size\n", initrd_filename);
        !           270:                 exit(1);
        !           271:             }
        !           272: 
        !           273:             mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_mod_length + mbs.mb_buf_size);
        !           274:             mbs.mb_buf = qemu_realloc(mbs.mb_buf, mbs.mb_buf_size);
        !           275: 
        !           276:             load_image(initrd_filename, (unsigned char *)mbs.mb_buf + offs);
        !           277:             mb_add_mod(&mbs, mbs.mb_buf_phys + offs,
        !           278:                        mbs.mb_buf_phys + offs + mb_mod_length, c);
        !           279: 
        !           280:             mb_debug("mod_start: %p\nmod_end:   %p\n  cmdline: "TARGET_FMT_plx"\n",
        !           281:                      (char *)mbs.mb_buf + offs,
        !           282:                      (char *)mbs.mb_buf + offs + mb_mod_length, c);
        !           283:             initrd_filename = next_initrd+1;
        !           284:         } while (next_initrd);
        !           285:     }
        !           286: 
        !           287:     /* Commandline support */
        !           288:     char kcmdline[strlen(kernel_filename) + strlen(kernel_cmdline) + 2];
        !           289:     snprintf(kcmdline, sizeof(kcmdline), "%s %s",
        !           290:              kernel_filename, kernel_cmdline);
        !           291:     stl_p(bootinfo + MBI_CMDLINE, mb_add_cmdline(&mbs, kcmdline));
        !           292: 
        !           293:     stl_p(bootinfo + MBI_MODS_ADDR,  mbs.mb_buf_phys + mbs.offset_mbinfo);
        !           294:     stl_p(bootinfo + MBI_MODS_COUNT, mbs.mb_mods_count); /* mods_count */
        !           295: 
        !           296:     /* the kernel is where we want it to be now */
        !           297:     stl_p(bootinfo + MBI_FLAGS, MULTIBOOT_FLAGS_MEMORY
        !           298:                                 | MULTIBOOT_FLAGS_BOOT_DEVICE
        !           299:                                 | MULTIBOOT_FLAGS_CMDLINE
        !           300:                                 | MULTIBOOT_FLAGS_MODULES
        !           301:                                 | MULTIBOOT_FLAGS_MMAP);
        !           302:     stl_p(bootinfo + MBI_MEM_LOWER,   640);
        !           303:     stl_p(bootinfo + MBI_MEM_UPPER,   ram_size / 1024);
        !           304:     stl_p(bootinfo + MBI_BOOT_DEVICE, 0x8001ffff); /* XXX: use the -boot switch? */
        !           305:     stl_p(bootinfo + MBI_MMAP_ADDR,   ADDR_E820_MAP);
        !           306: 
        !           307:     mb_debug("multiboot: mh_entry_addr = %#x\n", mh_entry_addr);
        !           308:     mb_debug("           mb_buf_phys   = "TARGET_FMT_plx"\n", mbs.mb_buf_phys);
        !           309:     mb_debug("           mod_start     = "TARGET_FMT_plx"\n", mbs.mb_buf_phys + mbs.offset_mods);
        !           310:     mb_debug("           mb_mods_count = %d\n", mbs.mb_mods_count);
        !           311: 
        !           312:     /* save bootinfo off the stack */
        !           313:     mb_bootinfo_data = qemu_malloc(sizeof(bootinfo));
        !           314:     memcpy(mb_bootinfo_data, bootinfo, sizeof(bootinfo));
        !           315: 
        !           316:     /* Pass variables to option rom */
        !           317:     fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ENTRY, mh_entry_addr);
        !           318:     fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, mh_load_addr);
        !           319:     fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, mbs.mb_buf_size);
        !           320:     fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA,
        !           321:                      mbs.mb_buf, mbs.mb_buf_size);
        !           322: 
        !           323:     fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, ADDR_MBI);
        !           324:     fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, sizeof(bootinfo));
        !           325:     fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, mb_bootinfo_data,
        !           326:                      sizeof(bootinfo));
        !           327: 
        !           328:     option_rom[nb_option_roms] = "multiboot.bin";
        !           329:     nb_option_roms++;
        !           330: 
        !           331:     return 1; /* yes, we are multiboot */
        !           332: }

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