[qemu.git] / hw / i386 / multiboot.c

/*
 * 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 "hw/hw.h"
#include "hw/nvram/fw_cfg.h"
#include "multiboot.h"
#include "hw/loader.h"
#include "elf.h"
#include "sysemu/sysemu.h"

/* Show multiboot debug output */
//#define DEBUG_MULTIBOOT

#ifdef DEBUG_MULTIBOOT
#define mb_debug(a...) fprintf(stderr, ## 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;

    get_opt_value(b, strlen(cmdline) + 1, cmdline);
    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_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: "TARGET_FMT_plx" - "TARGET_FMT_plx"\n",
             s->mb_mods_count, start, end);

    s->mb_mods_count++;
}

int load_multiboot(FWCfgState *fw_cfg,
                   FILE *f,
                   const char *kernel_filename,
                   const char *initrd_filename,
                   const char *kernel_cmdline,
                   int kernel_file_size,
                   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;
    uint32_t cmdline_len;

    /* 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);

        if (((struct elf64_hdr*)header)->e_machine == EM_X86_64) {
            fprintf(stderr, "Cannot load x86-64 image, give a 32bit one.\n");
            exit(1);
        }

        kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
                               &elf_low, &elf_high, 0, I386_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 = g_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);
        uint32_t mh_load_end_addr = ldl_p(header+i+20);
        uint32_t mh_bss_end_addr = ldl_p(header+i+24);
        mh_load_addr = ldl_p(header+i+16);
        uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr);
        uint32_t mb_load_size = 0;
        mh_entry_addr = ldl_p(header+i+28);

        if (mh_load_end_addr) {
            mb_kernel_size = mh_bss_end_addr - mh_load_addr;
            mb_load_size = mh_load_end_addr - mh_load_addr;
        } else {
            mb_kernel_size = kernel_file_size - mb_kernel_text_offset;
            mb_load_size = mb_kernel_size;
        }

        /* 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", mh_load_end_addr);
        mb_debug("multiboot: mh_bss_end_addr = %#x\n", mh_bss_end_addr);
        mb_debug("qemu: loading multiboot kernel (%#x bytes) at %#x\n",
                 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) {
            fprintf(stderr, "fread() failed\n");
            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(r) + 1;
        mbs.mb_mods_avail = 1;
        while (*(r = get_opt_value(NULL, 0, r))) {
           mbs.mb_mods_avail++;
           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 (initrd_filename) {
        char *next_initrd, not_last;

        mbs.offset_mods = mbs.mb_buf_size;

        do {
            char *next_space;
            int mb_mod_length;
            uint32_t offs = mbs.mb_buf_size;

            next_initrd = (char *)get_opt_value(NULL, 0, initrd_filename);
            not_last = *next_initrd;
            *next_initrd = '\0';
            /* if a space comes after the module filename, treat everything
               after that as parameters */
            hwaddr 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 open file '%s'\n", initrd_filename);
                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);

            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: "TARGET_FMT_plx"\n",
                     (char *)mbs.mb_buf + offs,
                     (char *)mbs.mb_buf + offs + mb_mod_length, c);
            initrd_filename = next_initrd+1;
        } while (not_last);
    }

    /* 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_BOOTLOADER, mb_add_bootloader(&mbs, bootloader_name));

    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
                                | MULTIBOOT_FLAGS_BOOTLOADER);
    stl_p(bootinfo + MBI_BOOT_DEVICE, 0x8000ffff); /* 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   = "TARGET_FMT_plx"\n", mbs.mb_buf_phys);
    mb_debug("           mod_start     = "TARGET_FMT_plx"\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 = g_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].name = "multiboot.bin";
    option_rom[nb_option_roms].bootindex = 0;
    nb_option_roms++;

    return 1; /* yes, we are multiboot */
}
Commit	Line	Data
52001445 AL	1	/*
	2	* QEMU PC System Emulator
	3	*
	4	* Copyright (c) 2003-2004 Fabrice Bellard
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
	24
b6a0aa05	25	#include "qemu/osdep.h"
83c9f4ca	26	#include "hw/hw.h"
0d09e41a	27	#include "hw/nvram/fw_cfg.h"
47b43a1f	28	#include "multiboot.h"
83c9f4ca	29	#include "hw/loader.h"
52001445	30	#include "elf.h"
9c17d615	31	#include "sysemu/sysemu.h"
52001445 AL	32
	33	/* Show multiboot debug output */
	34	//#define DEBUG_MULTIBOOT
	35
	36	#ifdef DEBUG_MULTIBOOT
	37	#define mb_debug(a...) fprintf(stderr, ## a)
	38	#else
	39	#define mb_debug(a...)
	40	#endif
	41
	42	#define MULTIBOOT_STRUCT_ADDR 0x9000
	43
	44	#if MULTIBOOT_STRUCT_ADDR > 0xf0000
	45	#error multiboot struct needs to fit in 16 bit real mode
	46	#endif
	47
	48	enum {
	49	/* Multiboot info */
	50	MBI_FLAGS = 0,
	51	MBI_MEM_LOWER = 4,
	52	MBI_MEM_UPPER = 8,
	53	MBI_BOOT_DEVICE = 12,
	54	MBI_CMDLINE = 16,
	55	MBI_MODS_COUNT = 20,
	56	MBI_MODS_ADDR = 24,
	57	MBI_MMAP_ADDR = 48,
5eba5a66	58	MBI_BOOTLOADER = 64,
52001445 AL	59
	60	MBI_SIZE = 88,
	61
	62	/* Multiboot modules */
	63	MB_MOD_START = 0,
	64	MB_MOD_END = 4,
	65	MB_MOD_CMDLINE = 8,
	66
	67	MB_MOD_SIZE = 16,
	68
	69	/* Region offsets */
	70	ADDR_E820_MAP = MULTIBOOT_STRUCT_ADDR + 0,
	71	ADDR_MBI = ADDR_E820_MAP + 0x500,
	72
	73	/* Multiboot flags */
	74	MULTIBOOT_FLAGS_MEMORY = 1 << 0,
	75	MULTIBOOT_FLAGS_BOOT_DEVICE = 1 << 1,
	76	MULTIBOOT_FLAGS_CMDLINE = 1 << 2,
	77	MULTIBOOT_FLAGS_MODULES = 1 << 3,
	78	MULTIBOOT_FLAGS_MMAP = 1 << 6,
5eba5a66	79	MULTIBOOT_FLAGS_BOOTLOADER = 1 << 9,
52001445 AL	80	};
	81
	82	typedef struct {
	83	/* buffer holding kernel, cmdlines and mb_infos */
	84	void *mb_buf;
	85	/* address in target */
a8170e5e	86	hwaddr mb_buf_phys;
52001445 AL	87	/* size of mb_buf in bytes */
	88	unsigned mb_buf_size;
	89	/* offset of mb-info's in bytes */
a8170e5e	90	hwaddr offset_mbinfo;
52001445	91	/* offset in buffer for cmdlines in bytes */
a8170e5e	92	hwaddr offset_cmdlines;
5eba5a66 DD	93	/* offset in buffer for bootloader name in bytes */
5eba5a66 DD	94	hwaddr offset_bootloader;
52001445	95	/* offset of modules in bytes */
a8170e5e	96	hwaddr offset_mods;
52001445 AL	97	/* available slots for mb modules infos */
	98	int mb_mods_avail;
	99	/* currently used slots of mb modules */
	100	int mb_mods_count;
	101	} MultibootState;
	102
5eba5a66 DD	103	const char *bootloader_name = "qemu";
5eba5a66 DD	104
52001445 AL	105	static uint32_t mb_add_cmdline(MultibootState s, const char cmdline)
52001445 AL	106	{
a8170e5e	107	hwaddr p = s->offset_cmdlines;
49e40b66	108	char b = (char )s->mb_buf + p;
52001445	109
49e40b66 AL	110	get_opt_value(b, strlen(cmdline) + 1, cmdline);
49e40b66 AL	111	s->offset_cmdlines += strlen(b) + 1;
52001445 AL	112	return s->mb_buf_phys + p;
	113	}
	114
5eba5a66 DD	115	static uint32_t mb_add_bootloader(MultibootState s, const char bootloader)
	116	{
	117	hwaddr p = s->offset_bootloader;
	118	char b = (char )s->mb_buf + p;
	119
	120	memcpy(b, bootloader, strlen(bootloader) + 1);
	121	s->offset_bootloader += strlen(b) + 1;
	122	return s->mb_buf_phys + p;
	123	}
	124
52001445	125	static void mb_add_mod(MultibootState *s,
a8170e5e AK	126	hwaddr start, hwaddr end,
a8170e5e AK	127	hwaddr cmdline_phys)
52001445 AL	128	{
	129	char *p;
	130	assert(s->mb_mods_count < s->mb_mods_avail);
	131
	132	p = (char )s->mb_buf + s->offset_mbinfo + MB_MOD_SIZE s->mb_mods_count;
	133
	134	stl_p(p + MB_MOD_START, start);
	135	stl_p(p + MB_MOD_END, end);
	136	stl_p(p + MB_MOD_CMDLINE, cmdline_phys);
	137
bd418d90 IY	138	mb_debug("mod%02d: "TARGET_FMT_plx" - "TARGET_FMT_plx"\n",
bd418d90 IY	139	s->mb_mods_count, start, end);
52001445 AL	140
	141	s->mb_mods_count++;
	142	}
	143
a88b362c	144	int load_multiboot(FWCfgState *fw_cfg,
52001445 AL	145	FILE *f,
	146	const char *kernel_filename,
	147	const char *initrd_filename,
	148	const char *kernel_cmdline,
	149	int kernel_file_size,
	150	uint8_t *header)
	151	{
	152	int i, is_multiboot = 0;
	153	uint32_t flags = 0;
	154	uint32_t mh_entry_addr;
	155	uint32_t mh_load_addr;
	156	uint32_t mb_kernel_size;
	157	MultibootState mbs;
	158	uint8_t bootinfo[MBI_SIZE];
	159	uint8_t *mb_bootinfo_data;
b4168498	160	uint32_t cmdline_len;
52001445 AL	161
	162	/* Ok, let's see if it is a multiboot image.
	163	The header is 12x32bit long, so the latest entry may be 8192 - 48. */
	164	for (i = 0; i < (8192 - 48); i += 4) {
	165	if (ldl_p(header+i) == 0x1BADB002) {
	166	uint32_t checksum = ldl_p(header+i+8);
	167	flags = ldl_p(header+i+4);
	168	checksum += flags;
	169	checksum += (uint32_t)0x1BADB002;
	170	if (!checksum) {
	171	is_multiboot = 1;
	172	break;
	173	}
	174	}
	175	}
	176
	177	if (!is_multiboot)
	178	return 0; /* no multiboot */
	179
	180	mb_debug("qemu: I believe we found a multiboot image!\n");
	181	memset(bootinfo, 0, sizeof(bootinfo));
	182	memset(&mbs, 0, sizeof(mbs));
	183
	184	if (flags & 0x00000004) { /* MULTIBOOT_HEADER_HAS_VBE */
	185	fprintf(stderr, "qemu: multiboot knows VBE. we don't.\n");
	186	}
	187	if (!(flags & 0x00010000)) { /* MULTIBOOT_HEADER_HAS_ADDR */
	188	uint64_t elf_entry;
	189	uint64_t elf_low, elf_high;
	190	int kernel_size;
	191	fclose(f);
96968466 AL	192
	193	if (((struct elf64_hdr*)header)->e_machine == EM_X86_64) {
	194	fprintf(stderr, "Cannot load x86-64 image, give a 32bit one.\n");
	195	exit(1);
	196	}
	197
409dbce5	198	kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
a5e8788f	199	&elf_low, &elf_high, 0, I386_ELF_MACHINE, 0);
52001445 AL	200	if (kernel_size < 0) {
	201	fprintf(stderr, "Error while loading elf kernel\n");
	202	exit(1);
	203	}
	204	mh_load_addr = elf_low;
	205	mb_kernel_size = elf_high - elf_low;
	206	mh_entry_addr = elf_entry;
	207
7267c094	208	mbs.mb_buf = g_malloc(mb_kernel_size);
52001445 AL	209	if (rom_copy(mbs.mb_buf, mh_load_addr, mb_kernel_size) != mb_kernel_size) {
	210	fprintf(stderr, "Error while fetching elf kernel from rom\n");
	211	exit(1);
	212	}
	213
	214	mb_debug("qemu: loading multiboot-elf kernel (%#x bytes) with entry %#zx\n",
	215	mb_kernel_size, (size_t)mh_entry_addr);
	216	} else {
	217	/* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_ADDR. */
	218	uint32_t mh_header_addr = ldl_p(header+i+12);
6b8273a1 GW	219	uint32_t mh_load_end_addr = ldl_p(header+i+20);
6b8273a1 GW	220	uint32_t mh_bss_end_addr = ldl_p(header+i+24);
52001445 AL	221	mh_load_addr = ldl_p(header+i+16);
52001445 AL	222	uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr);
9c3a596a	223	uint32_t mb_load_size = 0;
52001445	224	mh_entry_addr = ldl_p(header+i+28);
9c3a596a SM	225
	226	if (mh_load_end_addr) {
	227	mb_kernel_size = mh_bss_end_addr - mh_load_addr;
	228	mb_load_size = mh_load_end_addr - mh_load_addr;
	229	} else {
	230	mb_kernel_size = kernel_file_size - mb_kernel_text_offset;
	231	mb_load_size = mb_kernel_size;
	232	}
52001445 AL	233
	234	/* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_VBE.
	235	uint32_t mh_mode_type = ldl_p(header+i+32);
	236	uint32_t mh_width = ldl_p(header+i+36);
	237	uint32_t mh_height = ldl_p(header+i+40);
	238	uint32_t mh_depth = ldl_p(header+i+44); */
	239
	240	mb_debug("multiboot: mh_header_addr = %#x\n", mh_header_addr);
	241	mb_debug("multiboot: mh_load_addr = %#x\n", mh_load_addr);
6b8273a1 GW	242	mb_debug("multiboot: mh_load_end_addr = %#x\n", mh_load_end_addr);
6b8273a1 GW	243	mb_debug("multiboot: mh_bss_end_addr = %#x\n", mh_bss_end_addr);
52001445	244	mb_debug("qemu: loading multiboot kernel (%#x bytes) at %#x\n",
6b8273a1	245	mb_load_size, mh_load_addr);
52001445	246
7267c094	247	mbs.mb_buf = g_malloc(mb_kernel_size);
52001445	248	fseek(f, mb_kernel_text_offset, SEEK_SET);
6b8273a1	249	if (fread(mbs.mb_buf, 1, mb_load_size, f) != mb_load_size) {
52001445 AL	250	fprintf(stderr, "fread() failed\n");
	251	exit(1);
	252	}
6b8273a1	253	memset(mbs.mb_buf + mb_load_size, 0, mb_kernel_size - mb_load_size);
52001445 AL	254	fclose(f);
	255	}
	256
	257	mbs.mb_buf_phys = mh_load_addr;
	258
	259	mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_kernel_size);
	260	mbs.offset_mbinfo = mbs.mb_buf_size;
	261
5eba5a66	262	/* Calculate space for cmdlines, bootloader name, and mb_mods */
b4168498 KW	263	cmdline_len = strlen(kernel_filename) + 1;
b4168498 KW	264	cmdline_len += strlen(kernel_cmdline) + 1;
52001445 AL	265	if (initrd_filename) {
52001445 AL	266	const char *r = initrd_filename;
b4168498	267	cmdline_len += strlen(r) + 1;
52001445	268	mbs.mb_mods_avail = 1;
49e40b66	269	while (*(r = get_opt_value(NULL, 0, r))) {
52001445 AL	270	mbs.mb_mods_avail++;
	271	r++;
	272	}
52001445 AL	273	}
52001445 AL	274
b4168498 KW	275	mbs.mb_buf_size += cmdline_len;
	276	mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail;
	277	mbs.mb_buf_size += strlen(bootloader_name) + 1;
	278
52001445 AL	279	mbs.mb_buf_size = TARGET_PAGE_ALIGN(mbs.mb_buf_size);
52001445 AL	280
5eba5a66 DD	281	/* enlarge mb_buf to hold cmdlines, bootloader, mb-info structs */
	282	mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
	283	mbs.offset_cmdlines = mbs.offset_mbinfo + mbs.mb_mods_avail * MB_MOD_SIZE;
b4168498	284	mbs.offset_bootloader = mbs.offset_cmdlines + cmdline_len;
52001445 AL	285
52001445 AL	286	if (initrd_filename) {
49e40b66	287	char *next_initrd, not_last;
52001445 AL	288
	289	mbs.offset_mods = mbs.mb_buf_size;
	290
	291	do {
	292	char *next_space;
37a05af0	293	int mb_mod_length;
52001445 AL	294	uint32_t offs = mbs.mb_buf_size;
52001445 AL	295
49e40b66 AL	296	next_initrd = (char *)get_opt_value(NULL, 0, initrd_filename);
	297	not_last = *next_initrd;
	298	*next_initrd = '\0';
52001445 AL	299	/* if a space comes after the module filename, treat everything
52001445 AL	300	after that as parameters */
a8170e5e	301	hwaddr c = mb_add_cmdline(&mbs, initrd_filename);
52001445 AL	302	if ((next_space = strchr(initrd_filename, ' ')))
	303	*next_space = '\0';
	304	mb_debug("multiboot loading module: %s\n", initrd_filename);
	305	mb_mod_length = get_image_size(initrd_filename);
	306	if (mb_mod_length < 0) {
f95857b3	307	fprintf(stderr, "Failed to open file '%s'\n", initrd_filename);
52001445 AL	308	exit(1);
	309	}
	310
	311	mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_mod_length + mbs.mb_buf_size);
7267c094	312	mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size);
52001445 AL	313
	314	load_image(initrd_filename, (unsigned char *)mbs.mb_buf + offs);
	315	mb_add_mod(&mbs, mbs.mb_buf_phys + offs,
	316	mbs.mb_buf_phys + offs + mb_mod_length, c);
	317
bd418d90	318	mb_debug("mod_start: %p\nmod_end: %p\n cmdline: "TARGET_FMT_plx"\n",
52001445 AL	319	(char *)mbs.mb_buf + offs,
	320	(char *)mbs.mb_buf + offs + mb_mod_length, c);
	321	initrd_filename = next_initrd+1;
49e40b66	322	} while (not_last);
52001445 AL	323	}
	324
	325	/* Commandline support */
	326	char kcmdline[strlen(kernel_filename) + strlen(kernel_cmdline) + 2];
	327	snprintf(kcmdline, sizeof(kcmdline), "%s %s",
	328	kernel_filename, kernel_cmdline);
	329	stl_p(bootinfo + MBI_CMDLINE, mb_add_cmdline(&mbs, kcmdline));
	330
5eba5a66 DD	331	stl_p(bootinfo + MBI_BOOTLOADER, mb_add_bootloader(&mbs, bootloader_name));
5eba5a66 DD	332
52001445 AL	333	stl_p(bootinfo + MBI_MODS_ADDR, mbs.mb_buf_phys + mbs.offset_mbinfo);
	334	stl_p(bootinfo + MBI_MODS_COUNT, mbs.mb_mods_count); /* mods_count */
	335
	336	/* the kernel is where we want it to be now */
	337	stl_p(bootinfo + MBI_FLAGS, MULTIBOOT_FLAGS_MEMORY
	338	\| MULTIBOOT_FLAGS_BOOT_DEVICE
	339	\| MULTIBOOT_FLAGS_CMDLINE
	340	\| MULTIBOOT_FLAGS_MODULES
5eba5a66 DD	341	\| MULTIBOOT_FLAGS_MMAP
5eba5a66 DD	342	\| MULTIBOOT_FLAGS_BOOTLOADER);
c83066d4	343	stl_p(bootinfo + MBI_BOOT_DEVICE, 0x8000ffff); /* XXX: use the -boot switch? */
52001445 AL	344	stl_p(bootinfo + MBI_MMAP_ADDR, ADDR_E820_MAP);
	345
	346	mb_debug("multiboot: mh_entry_addr = %#x\n", mh_entry_addr);
bd418d90 IY	347	mb_debug(" mb_buf_phys = "TARGET_FMT_plx"\n", mbs.mb_buf_phys);
bd418d90 IY	348	mb_debug(" mod_start = "TARGET_FMT_plx"\n", mbs.mb_buf_phys + mbs.offset_mods);
52001445 AL	349	mb_debug(" mb_mods_count = %d\n", mbs.mb_mods_count);
	350
	351	/* save bootinfo off the stack */
7267c094	352	mb_bootinfo_data = g_malloc(sizeof(bootinfo));
52001445 AL	353	memcpy(mb_bootinfo_data, bootinfo, sizeof(bootinfo));
	354
	355	/* Pass variables to option rom */
	356	fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ENTRY, mh_entry_addr);
	357	fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, mh_load_addr);
	358	fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, mbs.mb_buf_size);
	359	fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA,
	360	mbs.mb_buf, mbs.mb_buf_size);
	361
	362	fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, ADDR_MBI);
	363	fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, sizeof(bootinfo));
	364	fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, mb_bootinfo_data,
	365	sizeof(bootinfo));
	366
2e55e842 GN	367	option_rom[nb_option_roms].name = "multiboot.bin";
2e55e842 GN	368	option_rom[nb_option_roms].bootindex = 0;
52001445 AL	369	nb_option_roms++;
	370
	371	return 1; /* yes, we are multiboot */
	372	}