diff options
Diffstat (limited to 'qemu/hw/i386/multiboot.c')
| -rw-r--r-- | qemu/hw/i386/multiboot.c | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/qemu/hw/i386/multiboot.c b/qemu/hw/i386/multiboot.c new file mode 100644 index 000000000..1adbe9e25 --- /dev/null +++ b/qemu/hw/i386/multiboot.c @@ -0,0 +1,371 @@ +/* + * 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/hw.h" +#include "hw/nvram/fw_cfg.h" +#include "multiboot.h" +#include "hw/loader.h" +#include "elf.h" +#include "sysemu/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_BOOTLOADER = 64, + + 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, + MULTIBOOT_FLAGS_BOOTLOADER = 1 << 9, +}; + +typedef struct { + /* buffer holding kernel, cmdlines and mb_infos */ + void *mb_buf; + /* address in target */ + hwaddr mb_buf_phys; + /* size of mb_buf in bytes */ + unsigned mb_buf_size; + /* offset of mb-info's in bytes */ + hwaddr offset_mbinfo; + /* offset in buffer for cmdlines in bytes */ + hwaddr offset_cmdlines; + /* offset in buffer for bootloader name in bytes */ + hwaddr offset_bootloader; + /* offset of modules in bytes */ + hwaddr offset_mods; + /* available slots for mb modules infos */ + int mb_mods_avail; + /* currently used slots of mb modules */ + int mb_mods_count; +} MultibootState; + +const char *bootloader_name = "qemu"; + +static uint32_t mb_add_cmdline(MultibootState *s, const char *cmdline) +{ + hwaddr 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 uint32_t mb_add_bootloader(MultibootState *s, const char *bootloader) +{ + hwaddr p = s->offset_bootloader; + char *b = (char *)s->mb_buf + p; + + memcpy(b, bootloader, strlen(bootloader) + 1); + s->offset_bootloader += strlen(b) + 1; + return s->mb_buf_phys + p; +} + +static void mb_add_mod(MultibootState *s, + hwaddr start, hwaddr end, + hwaddr 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(FWCfgState *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; + uint32_t cmdline_len; + + /* 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 = 0; + mh_entry_addr = ldl_p(header+i+28); + + if (mh_load_end_addr) { + mb_kernel_size = mh_bss_end_addr - mh_load_addr; + mb_load_size = mh_load_end_addr - mh_load_addr; + } else { + mb_kernel_size = kernel_file_size - mb_kernel_text_offset; + mb_load_size = mb_kernel_size; + } + + /* 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, bootloader name, and mb_mods */ + cmdline_len = strlen(kernel_filename) + 1; + cmdline_len += strlen(kernel_cmdline) + 1; + if (initrd_filename) { + const char *r = initrd_filename; + cmdline_len += 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 += cmdline_len; + mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail; + mbs.mb_buf_size += strlen(bootloader_name) + 1; + + mbs.mb_buf_size = TARGET_PAGE_ALIGN(mbs.mb_buf_size); + + /* enlarge mb_buf to hold cmdlines, bootloader, 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; + mbs.offset_bootloader = mbs.offset_cmdlines + cmdline_len; + + 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 */ + hwaddr 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_BOOTLOADER, mb_add_bootloader(&mbs, bootloader_name)); + + 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 + | MULTIBOOT_FLAGS_BOOTLOADER); + 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 */ +} |