multiboot: Separate multiboot loading into separate file

Move multiboot loading code into separate files as suggested by Alex Graf.

Signed-off-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 3 insertions, 302 deletions

diff --git a/hw/pc.c b/hw/pc.c
index 2dca777c95..7db5fc718c 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -44,19 +44,11 @@
 #include "ide.h"
 #include "loader.h"
 #include "elf.h"
+#include "multiboot.h"
 
 /* output Bochs bios info messages */
 //#define DEBUG_BIOS
 
-/* 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)
@@ -512,297 +504,6 @@ static long get_file_size(FILE *f)
     return size;
 }
 
-#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: %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,
-                          const char *initrd_filename,
-                          const char *kernel_cmdline,
-                          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);
-        kernel_size = load_elf(kernel_filename, 0, &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 = get_file_size(f) - 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;
-            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 */
-            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: %#x\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);
-    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));
-    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] = "multiboot.bin";
-    nb_option_roms++;
-
-    return 1; /* yes, we are multiboot */
-}
-
 static void load_linux(void *fw_cfg,
                        const char *kernel_filename,
 		       const char *initrd_filename,
@@ -839,8 +540,8 @@ static void load_linux(void *fw_cfg,
     else {
 	/* This looks like a multiboot kernel. If it is, let's stop
 	   treating it like a Linux kernel. */
-	if (load_multiboot(fw_cfg, f, kernel_filename,
-                           initrd_filename, kernel_cmdline, header))
+        if (load_multiboot(fw_cfg, f, kernel_filename, initrd_filename,
+                           kernel_cmdline, kernel_size, header))
             return;
 	protocol = 0;
     }