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, 331 insertions, 0 deletions

diff --git a/hw/multiboot.c b/hw/multiboot.c
new file mode 100644
index 000000000..a25fbf6f3
--- /dev/null
+++ b/hw/multiboot.c
@@ -0,0 +1,331 @@
+/*
+ * 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 "hw.h"
+#include "fw_cfg.h"
+#include "multiboot.h"
+#include "loader.h"
+#include "elf.h"
+#include "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_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++;
+}
+
+int load_multiboot(void *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;
+
+    /* 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 = kernel_file_size - 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 */
+}