/* * QEMU PC System Emulator * * Copyright (c) 2003-2004 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "hw.h" #include "fw_cfg.h" #include "multiboot.h" #include "loader.h" #include "elf.h" #include "sysemu.h" /* Show multiboot debug output */ //#define DEBUG_MULTIBOOT #ifdef DEBUG_MULTIBOOT #define mb_debug(a...) fprintf(stderr, ## a) #else #define mb_debug(a...) #endif #define MULTIBOOT_STRUCT_ADDR 0x9000 #if MULTIBOOT_STRUCT_ADDR > 0xf0000 #error multiboot struct needs to fit in 16 bit real mode #endif enum { /* Multiboot info */ MBI_FLAGS = 0, MBI_MEM_LOWER = 4, MBI_MEM_UPPER = 8, MBI_BOOT_DEVICE = 12, MBI_CMDLINE = 16, MBI_MODS_COUNT = 20, MBI_MODS_ADDR = 24, MBI_MMAP_ADDR = 48, MBI_SIZE = 88, /* Multiboot modules */ MB_MOD_START = 0, MB_MOD_END = 4, MB_MOD_CMDLINE = 8, MB_MOD_SIZE = 16, /* Region offsets */ ADDR_E820_MAP = MULTIBOOT_STRUCT_ADDR + 0, ADDR_MBI = ADDR_E820_MAP + 0x500, /* Multiboot flags */ MULTIBOOT_FLAGS_MEMORY = 1 << 0, MULTIBOOT_FLAGS_BOOT_DEVICE = 1 << 1, MULTIBOOT_FLAGS_CMDLINE = 1 << 2, MULTIBOOT_FLAGS_MODULES = 1 << 3, MULTIBOOT_FLAGS_MMAP = 1 << 6, }; typedef struct { /* buffer holding kernel, cmdlines and mb_infos */ void *mb_buf; /* address in target */ target_phys_addr_t mb_buf_phys; /* size of mb_buf in bytes */ unsigned mb_buf_size; /* offset of mb-info's in bytes */ target_phys_addr_t offset_mbinfo; /* offset in buffer for cmdlines in bytes */ target_phys_addr_t offset_cmdlines; /* offset of modules in bytes */ target_phys_addr_t offset_mods; /* available slots for mb modules infos */ int mb_mods_avail; /* currently used slots of mb modules */ int mb_mods_count; } MultibootState; static uint32_t mb_add_cmdline(MultibootState *s, const char *cmdline) { target_phys_addr_t p = s->offset_cmdlines; char *b = (char *)s->mb_buf + p; get_opt_value(b, strlen(cmdline) + 1, cmdline); s->offset_cmdlines += strlen(b) + 1; return s->mb_buf_phys + p; } static void mb_add_mod(MultibootState *s, target_phys_addr_t start, target_phys_addr_t end, target_phys_addr_t cmdline_phys) { char *p; assert(s->mb_mods_count < s->mb_mods_avail); p = (char *)s->mb_buf + s->offset_mbinfo + MB_MOD_SIZE * s->mb_mods_count; stl_p(p + MB_MOD_START, start); stl_p(p + MB_MOD_END, end); stl_p(p + MB_MOD_CMDLINE, cmdline_phys); mb_debug("mod%02d: "TARGET_FMT_plx" - "TARGET_FMT_plx"\n", s->mb_mods_count, start, end); s->mb_mods_count++; } int load_multiboot(void *fw_cfg, FILE *f, const char *kernel_filename, const char *initrd_filename, const char *kernel_cmdline, int kernel_file_size, uint8_t *header) { int i, is_multiboot = 0; uint32_t flags = 0; uint32_t mh_entry_addr; uint32_t mh_load_addr; uint32_t mb_kernel_size; MultibootState mbs; uint8_t bootinfo[MBI_SIZE]; uint8_t *mb_bootinfo_data; /* Ok, let's see if it is a multiboot image. The header is 12x32bit long, so the latest entry may be 8192 - 48. */ for (i = 0; i < (8192 - 48); i += 4) { if (ldl_p(header+i) == 0x1BADB002) { uint32_t checksum = ldl_p(header+i+8); flags = ldl_p(header+i+4); checksum += flags; checksum += (uint32_t)0x1BADB002; if (!checksum) { is_multiboot = 1; break; } } } if (!is_multiboot) return 0; /* no multiboot */ mb_debug("qemu: I believe we found a multiboot image!\n"); memset(bootinfo, 0, sizeof(bootinfo)); memset(&mbs, 0, sizeof(mbs)); if (flags & 0x00000004) { /* MULTIBOOT_HEADER_HAS_VBE */ fprintf(stderr, "qemu: multiboot knows VBE. we don't.\n"); } if (!(flags & 0x00010000)) { /* MULTIBOOT_HEADER_HAS_ADDR */ uint64_t elf_entry; uint64_t elf_low, elf_high; int kernel_size; fclose(f); if (((struct elf64_hdr*)header)->e_machine == EM_X86_64) { fprintf(stderr, "Cannot load x86-64 image, give a 32bit one.\n"); exit(1); } kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry, &elf_low, &elf_high, 0, ELF_MACHINE, 0); if (kernel_size < 0) { fprintf(stderr, "Error while loading elf kernel\n"); exit(1); } mh_load_addr = elf_low; mb_kernel_size = elf_high - elf_low; mh_entry_addr = elf_entry; mbs.mb_buf = g_malloc(mb_kernel_size); if (rom_copy(mbs.mb_buf, mh_load_addr, mb_kernel_size) != mb_kernel_size) { fprintf(stderr, "Error while fetching elf kernel from rom\n"); exit(1); } mb_debug("qemu: loading multiboot-elf kernel (%#x bytes) with entry %#zx\n", mb_kernel_size, (size_t)mh_entry_addr); } else { /* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_ADDR. */ uint32_t mh_header_addr = ldl_p(header+i+12); uint32_t mh_load_end_addr = ldl_p(header+i+20); uint32_t mh_bss_end_addr = ldl_p(header+i+24); mh_load_addr = ldl_p(header+i+16); uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr); uint32_t mb_load_size = mh_load_end_addr - mh_load_addr; mh_entry_addr = ldl_p(header+i+28); mb_kernel_size = mh_bss_end_addr - mh_load_addr; /* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_VBE. uint32_t mh_mode_type = ldl_p(header+i+32); uint32_t mh_width = ldl_p(header+i+36); uint32_t mh_height = ldl_p(header+i+40); uint32_t mh_depth = ldl_p(header+i+44); */ mb_debug("multiboot: mh_header_addr = %#x\n", mh_header_addr); mb_debug("multiboot: mh_load_addr = %#x\n", mh_load_addr); mb_debug("multiboot: mh_load_end_addr = %#x\n", mh_load_end_addr); mb_debug("multiboot: mh_bss_end_addr = %#x\n", mh_bss_end_addr); mb_debug("qemu: loading multiboot kernel (%#x bytes) at %#x\n", mb_load_size, mh_load_addr); mbs.mb_buf = g_malloc(mb_kernel_size); fseek(f, mb_kernel_text_offset, SEEK_SET); if (fread(mbs.mb_buf, 1, mb_load_size, f) != mb_load_size) { fprintf(stderr, "fread() failed\n"); exit(1); } memset(mbs.mb_buf + mb_load_size, 0, mb_kernel_size - mb_load_size); fclose(f); } mbs.mb_buf_phys = mh_load_addr; mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_kernel_size); mbs.offset_mbinfo = mbs.mb_buf_size; /* Calculate space for cmdlines and mb_mods */ mbs.mb_buf_size += strlen(kernel_filename) + 1; mbs.mb_buf_size += strlen(kernel_cmdline) + 1; if (initrd_filename) { const char *r = initrd_filename; mbs.mb_buf_size += strlen(r) + 1; mbs.mb_mods_avail = 1; while (*(r = get_opt_value(NULL, 0, r))) { mbs.mb_mods_avail++; r++; } mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail; } mbs.mb_buf_size = TARGET_PAGE_ALIGN(mbs.mb_buf_size); /* enlarge mb_buf to hold cmdlines and mb-info structs */ mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size); mbs.offset_cmdlines = mbs.offset_mbinfo + mbs.mb_mods_avail * MB_MOD_SIZE; if (initrd_filename) { char *next_initrd, not_last; mbs.offset_mods = mbs.mb_buf_size; do { char *next_space; int mb_mod_length; uint32_t offs = mbs.mb_buf_size; next_initrd = (char *)get_opt_value(NULL, 0, initrd_filename); not_last = *next_initrd; *next_initrd = '\0'; /* if a space comes after the module filename, treat everything after that as parameters */ target_phys_addr_t c = mb_add_cmdline(&mbs, initrd_filename); if ((next_space = strchr(initrd_filename, ' '))) *next_space = '\0'; mb_debug("multiboot loading module: %s\n", initrd_filename); mb_mod_length = get_image_size(initrd_filename); if (mb_mod_length < 0) { fprintf(stderr, "Failed to open file '%s'\n", initrd_filename); exit(1); } mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_mod_length + mbs.mb_buf_size); mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size); load_image(initrd_filename, (unsigned char *)mbs.mb_buf + offs); mb_add_mod(&mbs, mbs.mb_buf_phys + offs, mbs.mb_buf_phys + offs + mb_mod_length, c); mb_debug("mod_start: %p\nmod_end: %p\n cmdline: "TARGET_FMT_plx"\n", (char *)mbs.mb_buf + offs, (char *)mbs.mb_buf + offs + mb_mod_length, c); initrd_filename = next_initrd+1; } while (not_last); } /* Commandline support */ char kcmdline[strlen(kernel_filename) + strlen(kernel_cmdline) + 2]; snprintf(kcmdline, sizeof(kcmdline), "%s %s", kernel_filename, kernel_cmdline); stl_p(bootinfo + MBI_CMDLINE, mb_add_cmdline(&mbs, kcmdline)); stl_p(bootinfo + MBI_MODS_ADDR, mbs.mb_buf_phys + mbs.offset_mbinfo); stl_p(bootinfo + MBI_MODS_COUNT, mbs.mb_mods_count); /* mods_count */ /* the kernel is where we want it to be now */ stl_p(bootinfo + MBI_FLAGS, MULTIBOOT_FLAGS_MEMORY | MULTIBOOT_FLAGS_BOOT_DEVICE | MULTIBOOT_FLAGS_CMDLINE | MULTIBOOT_FLAGS_MODULES | MULTIBOOT_FLAGS_MMAP); stl_p(bootinfo + MBI_MEM_LOWER, 640); stl_p(bootinfo + MBI_MEM_UPPER, (ram_size / 1024) - 1024); stl_p(bootinfo + MBI_BOOT_DEVICE, 0x8000ffff); /* XXX: use the -boot switch? */ stl_p(bootinfo + MBI_MMAP_ADDR, ADDR_E820_MAP); mb_debug("multiboot: mh_entry_addr = %#x\n", mh_entry_addr); mb_debug(" mb_buf_phys = "TARGET_FMT_plx"\n", mbs.mb_buf_phys); mb_debug(" mod_start = "TARGET_FMT_plx"\n", mbs.mb_buf_phys + mbs.offset_mods); mb_debug(" mb_mods_count = %d\n", mbs.mb_mods_count); /* save bootinfo off the stack */ mb_bootinfo_data = g_malloc(sizeof(bootinfo)); memcpy(mb_bootinfo_data, bootinfo, sizeof(bootinfo)); /* Pass variables to option rom */ fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ENTRY, mh_entry_addr); fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, mh_load_addr); fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, mbs.mb_buf_size); fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA, mbs.mb_buf, mbs.mb_buf_size); fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, ADDR_MBI); fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, sizeof(bootinfo)); fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, mb_bootinfo_data, sizeof(bootinfo)); option_rom[nb_option_roms].name = "multiboot.bin"; option_rom[nb_option_roms].bootindex = 0; nb_option_roms++; return 1; /* yes, we are multiboot */ }