---
hw/pc.c | 268 +++++++++++++++++++++++++++++++++++++++------------------------
1 files changed, 167 insertions(+), 101 deletions(-)
diff --git a/hw/pc.c b/hw/pc.c
index 83f8dd0..2dca777 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -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);
-
- 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
+
+ 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: %#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));
- /* 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_MODS_ADDR, mbs.mb_buf_phys + mbs.offset_mbinfo);
+ stl_p(bootinfo + MBI_MODS_COUNT, mbs.mb_mods_count); /* mods_count */
-#ifdef DEBUG_MULTIBOOT
- fprintf(stderr, "multiboot: mh_entry_addr = %#x\n", mh_entry_addr);
-#endif
+ /* 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);
+ 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 = %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));