332 lines
12 KiB
C
332 lines
12 KiB
C
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/*
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* QEMU PC System Emulator
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*
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* Copyright (c) 2003-2004 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hw.h"
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#include "fw_cfg.h"
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#include "multiboot.h"
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#include "loader.h"
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#include "elf.h"
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#include "sysemu.h"
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/* Show multiboot debug output */
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//#define DEBUG_MULTIBOOT
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#ifdef DEBUG_MULTIBOOT
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#define mb_debug(a...) fprintf(stderr, ## a)
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#else
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#define mb_debug(a...)
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#endif
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#define MULTIBOOT_STRUCT_ADDR 0x9000
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#if MULTIBOOT_STRUCT_ADDR > 0xf0000
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#error multiboot struct needs to fit in 16 bit real mode
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#endif
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enum {
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/* Multiboot info */
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MBI_FLAGS = 0,
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MBI_MEM_LOWER = 4,
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MBI_MEM_UPPER = 8,
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MBI_BOOT_DEVICE = 12,
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MBI_CMDLINE = 16,
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MBI_MODS_COUNT = 20,
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MBI_MODS_ADDR = 24,
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MBI_MMAP_ADDR = 48,
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MBI_SIZE = 88,
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/* Multiboot modules */
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MB_MOD_START = 0,
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MB_MOD_END = 4,
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MB_MOD_CMDLINE = 8,
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MB_MOD_SIZE = 16,
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/* Region offsets */
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ADDR_E820_MAP = MULTIBOOT_STRUCT_ADDR + 0,
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ADDR_MBI = ADDR_E820_MAP + 0x500,
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/* Multiboot flags */
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MULTIBOOT_FLAGS_MEMORY = 1 << 0,
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MULTIBOOT_FLAGS_BOOT_DEVICE = 1 << 1,
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MULTIBOOT_FLAGS_CMDLINE = 1 << 2,
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MULTIBOOT_FLAGS_MODULES = 1 << 3,
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MULTIBOOT_FLAGS_MMAP = 1 << 6,
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};
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typedef struct {
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/* buffer holding kernel, cmdlines and mb_infos */
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void *mb_buf;
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/* address in target */
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target_phys_addr_t mb_buf_phys;
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/* size of mb_buf in bytes */
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unsigned mb_buf_size;
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/* offset of mb-info's in bytes */
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target_phys_addr_t offset_mbinfo;
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/* offset in buffer for cmdlines in bytes */
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target_phys_addr_t offset_cmdlines;
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/* offset of modules in bytes */
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target_phys_addr_t offset_mods;
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/* available slots for mb modules infos */
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int mb_mods_avail;
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/* currently used slots of mb modules */
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int mb_mods_count;
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} MultibootState;
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static uint32_t mb_add_cmdline(MultibootState *s, const char *cmdline)
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{
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int len = strlen(cmdline) + 1;
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target_phys_addr_t p = s->offset_cmdlines;
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pstrcpy((char *)s->mb_buf + p, len, cmdline);
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s->offset_cmdlines += len;
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return s->mb_buf_phys + p;
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}
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static void mb_add_mod(MultibootState *s,
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target_phys_addr_t start, target_phys_addr_t end,
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target_phys_addr_t cmdline_phys)
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{
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char *p;
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assert(s->mb_mods_count < s->mb_mods_avail);
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p = (char *)s->mb_buf + s->offset_mbinfo + MB_MOD_SIZE * s->mb_mods_count;
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stl_p(p + MB_MOD_START, start);
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stl_p(p + MB_MOD_END, end);
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stl_p(p + MB_MOD_CMDLINE, cmdline_phys);
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mb_debug("mod%02d: %08x - %08x\n", s->mb_mods_count, start, end);
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s->mb_mods_count++;
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}
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int load_multiboot(void *fw_cfg,
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FILE *f,
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const char *kernel_filename,
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const char *initrd_filename,
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const char *kernel_cmdline,
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int kernel_file_size,
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uint8_t *header)
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{
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int i, is_multiboot = 0;
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uint32_t flags = 0;
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uint32_t mh_entry_addr;
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uint32_t mh_load_addr;
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uint32_t mb_kernel_size;
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MultibootState mbs;
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uint8_t bootinfo[MBI_SIZE];
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uint8_t *mb_bootinfo_data;
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/* Ok, let's see if it is a multiboot image.
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The header is 12x32bit long, so the latest entry may be 8192 - 48. */
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for (i = 0; i < (8192 - 48); i += 4) {
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if (ldl_p(header+i) == 0x1BADB002) {
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uint32_t checksum = ldl_p(header+i+8);
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flags = ldl_p(header+i+4);
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checksum += flags;
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checksum += (uint32_t)0x1BADB002;
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if (!checksum) {
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is_multiboot = 1;
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break;
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}
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}
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}
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if (!is_multiboot)
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return 0; /* no multiboot */
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mb_debug("qemu: I believe we found a multiboot image!\n");
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memset(bootinfo, 0, sizeof(bootinfo));
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memset(&mbs, 0, sizeof(mbs));
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if (flags & 0x00000004) { /* MULTIBOOT_HEADER_HAS_VBE */
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fprintf(stderr, "qemu: multiboot knows VBE. we don't.\n");
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}
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if (!(flags & 0x00010000)) { /* MULTIBOOT_HEADER_HAS_ADDR */
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uint64_t elf_entry;
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uint64_t elf_low, elf_high;
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int kernel_size;
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fclose(f);
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kernel_size = load_elf(kernel_filename, 0, &elf_entry, &elf_low, &elf_high,
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0, ELF_MACHINE, 0);
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if (kernel_size < 0) {
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fprintf(stderr, "Error while loading elf kernel\n");
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exit(1);
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}
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mh_load_addr = elf_low;
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mb_kernel_size = elf_high - elf_low;
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mh_entry_addr = elf_entry;
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mbs.mb_buf = qemu_malloc(mb_kernel_size);
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if (rom_copy(mbs.mb_buf, mh_load_addr, mb_kernel_size) != mb_kernel_size) {
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fprintf(stderr, "Error while fetching elf kernel from rom\n");
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exit(1);
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}
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mb_debug("qemu: loading multiboot-elf kernel (%#x bytes) with entry %#zx\n",
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mb_kernel_size, (size_t)mh_entry_addr);
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} else {
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/* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_ADDR. */
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uint32_t mh_header_addr = ldl_p(header+i+12);
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mh_load_addr = ldl_p(header+i+16);
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uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr);
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mh_entry_addr = ldl_p(header+i+28);
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mb_kernel_size = kernel_file_size - mb_kernel_text_offset;
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/* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_VBE.
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uint32_t mh_mode_type = ldl_p(header+i+32);
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uint32_t mh_width = ldl_p(header+i+36);
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uint32_t mh_height = ldl_p(header+i+40);
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uint32_t mh_depth = ldl_p(header+i+44); */
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mb_debug("multiboot: mh_header_addr = %#x\n", mh_header_addr);
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mb_debug("multiboot: mh_load_addr = %#x\n", mh_load_addr);
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mb_debug("multiboot: mh_load_end_addr = %#x\n", ldl_p(header+i+20));
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mb_debug("multiboot: mh_bss_end_addr = %#x\n", ldl_p(header+i+24));
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mb_debug("qemu: loading multiboot kernel (%#x bytes) at %#x\n",
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mb_kernel_size, mh_load_addr);
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mbs.mb_buf = qemu_malloc(mb_kernel_size);
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fseek(f, mb_kernel_text_offset, SEEK_SET);
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if (fread(mbs.mb_buf, 1, mb_kernel_size, f) != mb_kernel_size) {
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fprintf(stderr, "fread() failed\n");
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exit(1);
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}
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fclose(f);
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}
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mbs.mb_buf_phys = mh_load_addr;
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mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_kernel_size);
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mbs.offset_mbinfo = mbs.mb_buf_size;
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/* Calculate space for cmdlines and mb_mods */
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mbs.mb_buf_size += strlen(kernel_filename) + 1;
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mbs.mb_buf_size += strlen(kernel_cmdline) + 1;
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if (initrd_filename) {
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const char *r = initrd_filename;
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mbs.mb_buf_size += strlen(r) + 1;
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mbs.mb_mods_avail = 1;
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while ((r = strchr(r, ','))) {
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mbs.mb_mods_avail++;
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r++;
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}
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mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail;
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}
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mbs.mb_buf_size = TARGET_PAGE_ALIGN(mbs.mb_buf_size);
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/* enlarge mb_buf to hold cmdlines and mb-info structs */
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mbs.mb_buf = qemu_realloc(mbs.mb_buf, mbs.mb_buf_size);
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mbs.offset_cmdlines = mbs.offset_mbinfo + mbs.mb_mods_avail * MB_MOD_SIZE;
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if (initrd_filename) {
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char *next_initrd;
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mbs.offset_mods = mbs.mb_buf_size;
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do {
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char *next_space;
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uint32_t mb_mod_length;
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uint32_t offs = mbs.mb_buf_size;
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next_initrd = strchr(initrd_filename, ',');
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if (next_initrd)
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*next_initrd = '\0';
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/* if a space comes after the module filename, treat everything
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after that as parameters */
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target_phys_addr_t c = mb_add_cmdline(&mbs, initrd_filename);
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if ((next_space = strchr(initrd_filename, ' ')))
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*next_space = '\0';
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mb_debug("multiboot loading module: %s\n", initrd_filename);
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mb_mod_length = get_image_size(initrd_filename);
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if (mb_mod_length < 0) {
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fprintf(stderr, "failed to get %s image size\n", initrd_filename);
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exit(1);
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}
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mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_mod_length + mbs.mb_buf_size);
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mbs.mb_buf = qemu_realloc(mbs.mb_buf, mbs.mb_buf_size);
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load_image(initrd_filename, (unsigned char *)mbs.mb_buf + offs);
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mb_add_mod(&mbs, mbs.mb_buf_phys + offs,
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mbs.mb_buf_phys + offs + mb_mod_length, c);
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mb_debug("mod_start: %p\nmod_end: %p\n cmdline: %#x\n",
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(char *)mbs.mb_buf + offs,
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(char *)mbs.mb_buf + offs + mb_mod_length, c);
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initrd_filename = next_initrd+1;
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} while (next_initrd);
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}
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/* Commandline support */
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char kcmdline[strlen(kernel_filename) + strlen(kernel_cmdline) + 2];
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snprintf(kcmdline, sizeof(kcmdline), "%s %s",
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kernel_filename, kernel_cmdline);
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stl_p(bootinfo + MBI_CMDLINE, mb_add_cmdline(&mbs, kcmdline));
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stl_p(bootinfo + MBI_MODS_ADDR, mbs.mb_buf_phys + mbs.offset_mbinfo);
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stl_p(bootinfo + MBI_MODS_COUNT, mbs.mb_mods_count); /* mods_count */
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/* the kernel is where we want it to be now */
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stl_p(bootinfo + MBI_FLAGS, MULTIBOOT_FLAGS_MEMORY
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| MULTIBOOT_FLAGS_BOOT_DEVICE
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| MULTIBOOT_FLAGS_CMDLINE
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| MULTIBOOT_FLAGS_MODULES
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| MULTIBOOT_FLAGS_MMAP);
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stl_p(bootinfo + MBI_MEM_LOWER, 640);
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stl_p(bootinfo + MBI_MEM_UPPER, ram_size / 1024);
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stl_p(bootinfo + MBI_BOOT_DEVICE, 0x8001ffff); /* XXX: use the -boot switch? */
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stl_p(bootinfo + MBI_MMAP_ADDR, ADDR_E820_MAP);
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mb_debug("multiboot: mh_entry_addr = %#x\n", mh_entry_addr);
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mb_debug(" mb_buf_phys = %x\n", mbs.mb_buf_phys);
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mb_debug(" mod_start = %x\n", mbs.mb_buf_phys + mbs.offset_mods);
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mb_debug(" mb_mods_count = %d\n", mbs.mb_mods_count);
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/* save bootinfo off the stack */
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mb_bootinfo_data = qemu_malloc(sizeof(bootinfo));
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memcpy(mb_bootinfo_data, bootinfo, sizeof(bootinfo));
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/* Pass variables to option rom */
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fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ENTRY, mh_entry_addr);
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fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, mh_load_addr);
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fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, mbs.mb_buf_size);
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fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA,
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mbs.mb_buf, mbs.mb_buf_size);
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fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, ADDR_MBI);
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fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, sizeof(bootinfo));
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fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, mb_bootinfo_data,
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sizeof(bootinfo));
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option_rom[nb_option_roms] = "multiboot.bin";
|
||
|
|
nb_option_roms++;
|
||
|
|
|
||
|
|
return 1; /* yes, we are multiboot */
|
||
|
|
}
|