| /* |
| * 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 "qemu/osdep.h" |
| #include "qemu/option.h" |
| #include "cpu.h" |
| #include "hw/nvram/fw_cfg.h" |
| #include "multiboot.h" |
| #include "hw/loader.h" |
| #include "elf.h" |
| #include "sysemu/sysemu.h" |
| #include "qemu/error-report.h" |
| |
| /* Show multiboot debug output */ |
| //#define DEBUG_MULTIBOOT |
| |
| #ifdef DEBUG_MULTIBOOT |
| #define mb_debug(a...) error_report(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; |
| |
| memcpy(b, cmdline, strlen(cmdline) + 1); |
| 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_le_p(p + MB_MOD_START, start); |
| stl_le_p(p + MB_MOD_END, end); |
| stl_le_p(p + MB_MOD_CMDLINE, cmdline_phys); |
| |
| mb_debug("mod%02d: "HWADDR_FMT_plx" - "HWADDR_FMT_plx, |
| s->mb_mods_count, start, end); |
| |
| s->mb_mods_count++; |
| } |
| |
| int load_multiboot(X86MachineState *x86ms, |
| FWCfgState *fw_cfg, |
| FILE *f, |
| const char *kernel_filename, |
| const char *initrd_filename, |
| const char *kernel_cmdline, |
| int kernel_file_size, |
| uint8_t *header) |
| { |
| bool multiboot_dma_enabled = X86_MACHINE_GET_CLASS(x86ms)->fwcfg_dma_enabled; |
| 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; |
| GList *mods = NULL; |
| g_autofree char *kcmdline = NULL; |
| |
| /* 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_le_p(header + i) == 0x1BADB002) { |
| uint32_t checksum = ldl_le_p(header + i + 8); |
| flags = ldl_le_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("I believe we found a multiboot image!"); |
| memset(bootinfo, 0, sizeof(bootinfo)); |
| memset(&mbs, 0, sizeof(mbs)); |
| |
| if (flags & 0x00000004) { /* MULTIBOOT_HEADER_HAS_VBE */ |
| error_report("multiboot knows VBE. we don't"); |
| } |
| 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) { |
| error_report("Cannot load x86-64 image, give a 32bit one."); |
| exit(1); |
| } |
| |
| kernel_size = load_elf(kernel_filename, NULL, NULL, NULL, &elf_entry, |
| &elf_low, &elf_high, NULL, 0, I386_ELF_MACHINE, |
| 0, 0); |
| if (kernel_size < 0) { |
| error_report("Error while loading elf kernel"); |
| 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) { |
| error_report("Error while fetching elf kernel from rom"); |
| exit(1); |
| } |
| |
| mb_debug("loading multiboot-elf kernel " |
| "(%#x bytes) with entry %#zx", |
| mb_kernel_size, (size_t)mh_entry_addr); |
| } else { |
| /* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_ADDR. */ |
| uint32_t mh_header_addr = ldl_le_p(header + i + 12); |
| uint32_t mh_load_end_addr = ldl_le_p(header + i + 20); |
| uint32_t mh_bss_end_addr = ldl_le_p(header + i + 24); |
| |
| mh_load_addr = ldl_le_p(header + i + 16); |
| if (mh_header_addr < mh_load_addr) { |
| error_report("invalid load_addr address"); |
| exit(1); |
| } |
| if (mh_header_addr - mh_load_addr > i) { |
| error_report("invalid header_addr address"); |
| exit(1); |
| } |
| |
| uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr); |
| uint32_t mb_load_size = 0; |
| mh_entry_addr = ldl_le_p(header + i + 28); |
| |
| if (mh_load_end_addr) { |
| if (mh_load_end_addr < mh_load_addr) { |
| error_report("invalid load_end_addr address"); |
| exit(1); |
| } |
| mb_load_size = mh_load_end_addr - mh_load_addr; |
| } else { |
| if (kernel_file_size < mb_kernel_text_offset) { |
| error_report("invalid kernel_file_size"); |
| exit(1); |
| } |
| mb_load_size = kernel_file_size - mb_kernel_text_offset; |
| } |
| if (mb_load_size > UINT32_MAX - mh_load_addr) { |
| error_report("kernel does not fit in address space"); |
| exit(1); |
| } |
| if (mh_bss_end_addr) { |
| if (mh_bss_end_addr < (mh_load_addr + mb_load_size)) { |
| error_report("invalid bss_end_addr address"); |
| exit(1); |
| } |
| mb_kernel_size = mh_bss_end_addr - mh_load_addr; |
| } else { |
| mb_kernel_size = mb_load_size; |
| } |
| |
| mb_debug("multiboot: header_addr = %#x", mh_header_addr); |
| mb_debug("multiboot: load_addr = %#x", mh_load_addr); |
| mb_debug("multiboot: load_end_addr = %#x", mh_load_end_addr); |
| mb_debug("multiboot: bss_end_addr = %#x", mh_bss_end_addr); |
| mb_debug("loading multiboot kernel (%#x bytes) at %#x", |
| 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) { |
| error_report("fread() failed"); |
| 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(initrd_filename) + 1; |
| while (*r) { |
| char *value; |
| r = get_opt_value(r, &value); |
| mbs.mb_mods_avail++; |
| mods = g_list_append(mods, value); |
| if (*r) { |
| 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 (mods) { |
| GList *tmpl = mods; |
| mbs.offset_mods = mbs.mb_buf_size; |
| |
| while (tmpl) { |
| char *next_space; |
| int mb_mod_length; |
| uint32_t offs = mbs.mb_buf_size; |
| char *one_file = tmpl->data; |
| |
| /* if a space comes after the module filename, treat everything |
| after that as parameters */ |
| hwaddr c = mb_add_cmdline(&mbs, one_file); |
| next_space = strchr(one_file, ' '); |
| if (next_space) { |
| *next_space = '\0'; |
| } |
| mb_debug("multiboot loading module: %s", one_file); |
| mb_mod_length = get_image_size(one_file); |
| if (mb_mod_length < 0) { |
| error_report("Failed to open file '%s'", one_file); |
| 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); |
| |
| if (load_image_size(one_file, (unsigned char *)mbs.mb_buf + offs, |
| mbs.mb_buf_size - offs) < 0) { |
| error_report("Error loading file '%s'", one_file); |
| exit(1); |
| } |
| 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: "HWADDR_FMT_plx, |
| (char *)mbs.mb_buf + offs, |
| (char *)mbs.mb_buf + offs + mb_mod_length, c); |
| g_free(one_file); |
| tmpl = tmpl->next; |
| } |
| g_list_free(mods); |
| } |
| |
| /* Commandline support */ |
| kcmdline = g_strdup_printf("%s %s", kernel_filename, kernel_cmdline); |
| stl_le_p(bootinfo + MBI_CMDLINE, mb_add_cmdline(&mbs, kcmdline)); |
| stl_le_p(bootinfo + MBI_BOOTLOADER, mb_add_bootloader(&mbs, |
| bootloader_name)); |
| stl_le_p(bootinfo + MBI_MODS_ADDR, mbs.mb_buf_phys + mbs.offset_mbinfo); |
| stl_le_p(bootinfo + MBI_MODS_COUNT, mbs.mb_mods_count); /* mods_count */ |
| |
| /* the kernel is where we want it to be now */ |
| stl_le_p(bootinfo + MBI_FLAGS, MULTIBOOT_FLAGS_MEMORY |
| | MULTIBOOT_FLAGS_BOOT_DEVICE |
| | MULTIBOOT_FLAGS_CMDLINE |
| | MULTIBOOT_FLAGS_MODULES |
| | MULTIBOOT_FLAGS_MMAP |
| | MULTIBOOT_FLAGS_BOOTLOADER); |
| stl_le_p(bootinfo + MBI_BOOT_DEVICE, 0x8000ffff); /* XXX: use the -boot switch? */ |
| stl_le_p(bootinfo + MBI_MMAP_ADDR, ADDR_E820_MAP); |
| |
| mb_debug("multiboot: entry_addr = %#x", mh_entry_addr); |
| mb_debug(" mb_buf_phys = "HWADDR_FMT_plx, mbs.mb_buf_phys); |
| mb_debug(" mod_start = "HWADDR_FMT_plx, |
| mbs.mb_buf_phys + mbs.offset_mods); |
| mb_debug(" mb_mods_count = %d", mbs.mb_mods_count); |
| |
| /* save bootinfo off the stack */ |
| mb_bootinfo_data = g_memdup(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)); |
| |
| if (multiboot_dma_enabled) { |
| option_rom[nb_option_roms].name = "multiboot_dma.bin"; |
| } else { |
| option_rom[nb_option_roms].name = "multiboot.bin"; |
| } |
| option_rom[nb_option_roms].bootindex = 0; |
| nb_option_roms++; |
| |
| return 1; /* yes, we are multiboot */ |
| } |
