| /* |
| * 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) |
| { |
| int len = strlen(cmdline) + 1; |
| target_phys_addr_t p = s->offset_cmdlines; |
| |
| pstrcpy((char *)s->mb_buf + p, len, cmdline); |
| s->offset_cmdlines += len; |
| 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 = qemu_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); |
| mh_load_addr = ldl_p(header+i+16); |
| uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr); |
| |
| mh_entry_addr = ldl_p(header+i+28); |
| mb_kernel_size = kernel_file_size - mb_kernel_text_offset; |
| |
| /* 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", ldl_p(header+i+20)); |
| mb_debug("multiboot: mh_bss_end_addr = %#x\n", ldl_p(header+i+24)); |
| mb_debug("qemu: loading multiboot kernel (%#x bytes) at %#x\n", |
| mb_kernel_size, mh_load_addr); |
| |
| mbs.mb_buf = qemu_malloc(mb_kernel_size); |
| fseek(f, mb_kernel_text_offset, SEEK_SET); |
| if (fread(mbs.mb_buf, 1, mb_kernel_size, f) != mb_kernel_size) { |
| fprintf(stderr, "fread() failed\n"); |
| exit(1); |
| } |
| 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 = strchr(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 = qemu_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; |
| |
| mbs.offset_mods = mbs.mb_buf_size; |
| |
| do { |
| char *next_space; |
| int mb_mod_length; |
| uint32_t offs = mbs.mb_buf_size; |
| |
| next_initrd = strchr(initrd_filename, ','); |
| if (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 get %s image size\n", initrd_filename); |
| exit(1); |
| } |
| |
| mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_mod_length + mbs.mb_buf_size); |
| mbs.mb_buf = qemu_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 (next_initrd); |
| } |
| |
| /* 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, 0x8001ffff); /* 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 = qemu_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 */ |
| } |
