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multiboot: Support arbitrary number of modules. 

Signed-off-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Adam Lackorzynski 2009-12-26 14:13:45 +01:00 committed by Anthony Liguori
parent d0652aa8ac
commit ee0216275b
1 changed files with 164 additions and 98 deletions
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262
hw/pc.c
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@ -51,6 +51,12 @@
/* Show multiboot debug output */
//#define DEBUG_MULTIBOOT
#ifdef DEBUG_MULTIBOOT
#define mb_debug(a...) fprintf(stderr, ## a)
#else
#define mb_debug(a...)
#endif
#define BIOS_FILENAME "bios.bin"
#define PC_MAX_BIOS_SIZE (4 * 1024 * 1024)
@ -512,6 +518,85 @@ static long get_file_size(FILE *f)
#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: %08x - %08x\n", s->mb_mods_count, start, end);
s->mb_mods_count++;
}
static int load_multiboot(void *fw_cfg,
FILE *f,
const char *kernel_filename,
@ -524,12 +609,8 @@ static int load_multiboot(void *fw_cfg,
uint32_t mh_entry_addr;
uint32_t mh_load_addr;
uint32_t mb_kernel_size;
uint32_t mmap_addr = MULTIBOOT_STRUCT_ADDR;
uint32_t mb_bootinfo = MULTIBOOT_STRUCT_ADDR + 0x500;
uint32_t mb_mod_end;
uint8_t bootinfo[0x500];
uint32_t cmdline = 0x200;
uint8_t *mb_kernel_data;
MultibootState mbs;
uint8_t bootinfo[MBI_SIZE];
uint8_t *mb_bootinfo_data;
/* Ok, let's see if it is a multiboot image.
@ -550,10 +631,9 @@ static int load_multiboot(void *fw_cfg,
if (!is_multiboot)
return 0; /* no multiboot */
#ifdef DEBUG_MULTIBOOT
fprintf(stderr, "qemu: I believe we found a multiboot image!\n");
#endif
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");
@ -573,24 +653,18 @@ static int load_multiboot(void *fw_cfg,
mb_kernel_size = elf_high - elf_low;
mh_entry_addr = elf_entry;
mb_kernel_data = qemu_malloc(mb_kernel_size);
if (rom_copy(mb_kernel_data, mh_load_addr, mb_kernel_size) != mb_kernel_size) {
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);
}
#ifdef DEBUG_MULTIBOOT
fprintf(stderr, "qemu: loading multiboot-elf kernel (%#x bytes) with entry %#zx\n",
mb_kernel_size, (size_t)mh_entry_addr);
#endif
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);
#ifdef DEBUG_MULTIBOOT
uint32_t mh_load_end_addr = ldl_p(header+i+20);
uint32_t mh_bss_end_addr = ldl_p(header+i+24);
#endif
uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr);
mh_entry_addr = ldl_p(header+i+28);
@ -602,118 +676,110 @@ static int load_multiboot(void *fw_cfg,
uint32_t mh_height = ldl_p(header+i+40);
uint32_t mh_depth = ldl_p(header+i+44); */
#ifdef DEBUG_MULTIBOOT
fprintf(stderr, "multiboot: mh_header_addr = %#x\n", mh_header_addr);
fprintf(stderr, "multiboot: mh_load_addr = %#x\n", mh_load_addr);
fprintf(stderr, "multiboot: mh_load_end_addr = %#x\n", mh_load_end_addr);
fprintf(stderr, "multiboot: mh_bss_end_addr = %#x\n", mh_bss_end_addr);
fprintf(stderr, "qemu: loading multiboot kernel (%#x bytes) at %#x\n",
mb_kernel_size, mh_load_addr);
#endif
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);
mb_kernel_data = qemu_malloc(mb_kernel_size);
mbs.mb_buf = qemu_malloc(mb_kernel_size);
fseek(f, mb_kernel_text_offset, SEEK_SET);
if (fread(mb_kernel_data, 1, mb_kernel_size, f) != mb_kernel_size) {
if (fread(mbs.mb_buf, 1, mb_kernel_size, f) != mb_kernel_size) {
fprintf(stderr, "fread() failed\n");
exit(1);
}
fclose(f);
}
/* blob size is only the kernel for now */
mb_mod_end = mh_load_addr + mb_kernel_size;
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;
/* load modules */
stl_p(bootinfo + 20, 0x0); /* mods_count */
if (initrd_filename) {
uint32_t mb_mod_info = 0x100;
uint32_t mb_mod_cmdline = 0x300;
uint32_t mb_mod_start = mh_load_addr;
uint32_t mb_mod_length = mb_kernel_size;
char *next_initrd;
char *next_space;
int mb_mod_count = 0;
mbs.offset_mods = mbs.mb_buf_size;
do {
if (mb_mod_info + 16 > mb_mod_cmdline) {
printf("WARNING: Too many modules loaded, aborting.\n");
break;
}
char *next_space;
uint32_t 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 */
pstrcpy((char*)bootinfo + mb_mod_cmdline,
sizeof(bootinfo) - mb_mod_cmdline,
initrd_filename);
stl_p(bootinfo + mb_mod_info + 8, mb_bootinfo + mb_mod_cmdline); /* string */
mb_mod_cmdline += strlen(initrd_filename) + 1;
if (mb_mod_cmdline > sizeof(bootinfo)) {
mb_mod_cmdline = sizeof(bootinfo);
printf("WARNING: Too many module cmdlines loaded, aborting.\n");
break;
}
target_phys_addr_t c = mb_add_cmdline(&mbs, initrd_filename);
if ((next_space = strchr(initrd_filename, ' ')))
*next_space = '\0';
#ifdef DEBUG_MULTIBOOT
printf("multiboot loading module: %s\n", initrd_filename);
#endif
mb_mod_start = (mb_mod_start + mb_mod_length + (TARGET_PAGE_SIZE - 1))
& (TARGET_PAGE_MASK);
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);
}
mb_mod_end = mb_mod_start + mb_mod_length;
mb_mod_count++;
/* append module data at the end of last module */
mb_kernel_data = qemu_realloc(mb_kernel_data,
mb_mod_end - mh_load_addr);
load_image(initrd_filename,
mb_kernel_data + mb_mod_start - mh_load_addr);
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);
stl_p(bootinfo + mb_mod_info + 0, mb_mod_start);
stl_p(bootinfo + mb_mod_info + 4, mb_mod_start + mb_mod_length);
stl_p(bootinfo + mb_mod_info + 12, 0x0); /* reserved */
#ifdef DEBUG_MULTIBOOT
printf("mod_start: %#x\nmod_end: %#x\n", mb_mod_start,
mb_mod_start + mb_mod_length);
#endif
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: %#x\n",
(char *)mbs.mb_buf + offs,
(char *)mbs.mb_buf + offs + mb_mod_length, c);
initrd_filename = next_initrd+1;
mb_mod_info += 16;
} while (next_initrd);
stl_p(bootinfo + 20, mb_mod_count); /* mods_count */
stl_p(bootinfo + 24, mb_bootinfo + 0x100); /* mods_addr */
}
/* Commandline support */
stl_p(bootinfo + 16, mb_bootinfo + cmdline);
snprintf((char*)bootinfo + cmdline, 0x100, "%s %s",
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 */
#define MULTIBOOT_FLAGS_MEMORY (1 << 0)
#define MULTIBOOT_FLAGS_BOOT_DEVICE (1 << 1)
#define MULTIBOOT_FLAGS_CMDLINE (1 << 2)
#define MULTIBOOT_FLAGS_MODULES (1 << 3)
#define MULTIBOOT_FLAGS_MMAP (1 << 6)
stl_p(bootinfo, MULTIBOOT_FLAGS_MEMORY
| MULTIBOOT_FLAGS_BOOT_DEVICE
| MULTIBOOT_FLAGS_CMDLINE
| MULTIBOOT_FLAGS_MODULES
| MULTIBOOT_FLAGS_MMAP);
stl_p(bootinfo + 4, 640); /* mem_lower */
stl_p(bootinfo + 8, ram_size / 1024); /* mem_upper */
stl_p(bootinfo + 12, 0x8001ffff); /* XXX: use the -boot switch? */
stl_p(bootinfo + 48, mmap_addr); /* mmap_addr */
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);
stl_p(bootinfo + MBI_BOOT_DEVICE, 0x8001ffff); /* XXX: use the -boot switch? */
stl_p(bootinfo + MBI_MMAP_ADDR, ADDR_E820_MAP);
#ifdef DEBUG_MULTIBOOT
fprintf(stderr, "multiboot: mh_entry_addr = %#x\n", mh_entry_addr);
#endif
mb_debug("multiboot: mh_entry_addr = %#x\n", mh_entry_addr);
mb_debug(" mb_buf_phys = %x\n", mbs.mb_buf_phys);
mb_debug(" mod_start = %x\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));
@ -722,11 +788,11 @@ static int load_multiboot(void *fw_cfg,
/* 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, mb_mod_end - mh_load_addr);
fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA, mb_kernel_data,
mb_mod_end - 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, mb_bootinfo);
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));