diff options
author | wdenk <wdenk> | 2003-06-27 21:31:46 +0000 |
---|---|---|
committer | wdenk <wdenk> | 2003-06-27 21:31:46 +0000 |
commit | 8bde7f776c77b343aca29b8c7b58464d915ac245 (patch) | |
tree | 20f1fd99975215e7c658454a15cdb4ed4694e2d4 /lib_i386/zimage.c | |
parent | 993cad9364c6b87ae429d1ed1130d8153f6f027e (diff) |
* Code cleanup:
- remove trailing white space, trailing empty lines, C++ comments, etc.
- split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c)
* Patches by Kenneth Johansson, 25 Jun 2003:
- major rework of command structure
(work done mostly by Michal Cendrowski and Joakim Kristiansen)
Diffstat (limited to 'lib_i386/zimage.c')
-rw-r--r-- | lib_i386/zimage.c | 143 |
1 files changed, 71 insertions, 72 deletions
diff --git a/lib_i386/zimage.c b/lib_i386/zimage.c index 9d33b2d272..3510f2fd64 100644 --- a/lib_i386/zimage.c +++ b/lib_i386/zimage.c @@ -1,7 +1,7 @@ /* * (C) Copyright 2002 * Daniel Engström, Omicron Ceti AB, daniel@omicron.se - * + * * See file CREDITS for list of people who contributed to this * project. * @@ -21,10 +21,10 @@ * MA 02111-1307 USA */ -/* +/* * Linux i386 zImage and bzImage loading - * - * based on the procdure described in + * + * based on the procdure described in * linux/Documentation/i386/boot.txt */ @@ -37,10 +37,10 @@ /* * Memory lay-out: - * + * * relative to setup_base (which is 0x90000 currently) - * - * 0x0000-0x7FFF Real mode kernel + * + * 0x0000-0x7FFF Real mode kernel * 0x8000-0x8FFF Stack and heap * 0x9000-0x90FF Kernel command line */ @@ -53,53 +53,53 @@ static void build_command_line(char *command_line, int auto_boot) { char *env_command_line; - + command_line[0] = '\0'; - + env_command_line = getenv("bootargs"); - + /* set console= argument if we use a serial console */ if (NULL == strstr(env_command_line, "console=")) { if (0==strcmp(getenv("stdout"), "serial")) { - + /* We seem to use serial console */ - sprintf(command_line, "console=ttyS0,%s ", + sprintf(command_line, "console=ttyS0,%s ", getenv("baudrate")); } } - + if (auto_boot) { strcat(command_line, "auto "); } - + if (NULL != env_command_line) { strcat(command_line, env_command_line); - } - - + } + + printf("Kernel command line: \"%s\"\n", command_line); } -void *load_zimage(char *image, unsigned long kernel_size, +void *load_zimage(char *image, unsigned long kernel_size, unsigned long initrd_addr, unsigned long initrd_size, int auto_boot) { - void *setup_base; + void *setup_base; int setup_size; int bootproto; int big_image; void *load_address; - - + + setup_base = (void*)DEFAULT_SETUP_BASE; /* base address for real-mode segment */ - - if (KERNEL_MAGIC != *(u16*)(image + BOOT_FLAG_OFF)) { + + if (KERNEL_MAGIC != *(u16*)(image + BOOT_FLAG_OFF)) { printf("Error: Invalid kernel magic (found 0x%04x, expected 0xaa55)\n", *(u16*)(image + BOOT_FLAG_OFF)); return 0; } - - + + /* determine boot protocol version */ if (KERNEL_V2_MAGIC == *(u32*)(image+HEADER_OFF)) { bootproto = *(u16*)(image+VERSION_OFF); @@ -107,108 +107,107 @@ void *load_zimage(char *image, unsigned long kernel_size, /* Very old kernel */ bootproto = 0x0100; } - + /* determine size of setup */ if (0 == *(u8*)(image + SETUP_SECTS_OFF)) { setup_size = 5 * 512; } else { setup_size = (*(u8*)(image + SETUP_SECTS_OFF) + 1) * 512; } - + if (setup_size > SETUP_MAX_SIZE) { printf("Error: Setup is too large (%d bytes)\n", setup_size); } - + /* Determine image type */ - big_image = (bootproto >= 0x0200) && (*(u8*)(image + LOADFLAGS_OFF) & BIG_KERNEL_FLAG); - + big_image = (bootproto >= 0x0200) && (*(u8*)(image + LOADFLAGS_OFF) & BIG_KERNEL_FLAG); + /* Derermine load address */ load_address = (void*)(big_image ? BZIMAGE_LOAD_ADDR:ZIMAGE_LOAD_ADDR); - + /* load setup */ memmove(setup_base, image, setup_size); - - printf("Using boot protocol version %x.%02x\n", + + printf("Using boot protocol version %x.%02x\n", (bootproto & 0xff00) >> 8, bootproto & 0xff); - - - if (bootproto == 0x0100) { - + + + if (bootproto == 0x0100) { + *(u16*)(setup_base + CMD_LINE_MAGIC_OFF) = COMMAND_LINE_MAGIC; - *(u16*)(setup_base + CMD_LINE_OFFSET_OFF) = COMMAND_LINE_OFFSET; - + *(u16*)(setup_base + CMD_LINE_OFFSET_OFF) = COMMAND_LINE_OFFSET; + /* A very old kernel MUST have its real-mode code * loaded at 0x90000 */ - + if ((u32)setup_base != 0x90000) { /* Copy the real-mode kernel */ memmove((void*)0x90000, setup_base, setup_size); /* Copy the command line */ - memmove((void*)0x99000, setup_base+COMMAND_LINE_OFFSET, + memmove((void*)0x99000, setup_base+COMMAND_LINE_OFFSET, COMMAND_LINE_SIZE); - + setup_base = (void*)0x90000; /* Relocated */ } - + /* It is recommended to clear memory up to the 32K mark */ memset((void*)0x90000 + setup_size, 0, SETUP_MAX_SIZE-setup_size); } - + if (bootproto >= 0x0200) { *(u8*)(setup_base + TYPE_OF_LOADER_OFF) = 0xff; - printf("Linux kernel version %s\n", - (char*)(setup_base + SETUP_START_OFFSET + + printf("Linux kernel version %s\n", + (char*)(setup_base + SETUP_START_OFFSET + *(u16*)(setup_base + START_SYS_OFF + 2))); - + if (initrd_addr) { printf("Initial RAM disk at linear address 0x%08lx, size %ld bytes\n", initrd_addr, initrd_size); - + *(u32*)(setup_base + RAMDISK_IMAGE_OFF) = initrd_addr; *(u32*)(setup_base + RAMDISK_SIZE_OFF)=initrd_size; } } - + if (bootproto >= 0x0201) { *(u16*)(setup_base + HEAP_END_PTR_OFF) = HEAP_END_OFFSET; - + /* CAN_USE_HEAP */ - *(u8*)(setup_base + LOADFLAGS_OFF) = + *(u8*)(setup_base + LOADFLAGS_OFF) = *(u8*)(setup_base + LOADFLAGS_OFF) | HEAP_FLAG; } - + if (bootproto >= 0x0202) { *(u32*)(setup_base + CMD_LINE_PTR_OFF) = (u32)setup_base + COMMAND_LINE_OFFSET; } else if (bootproto >= 0x0200) { *(u16*)(setup_base + CMD_LINE_MAGIC_OFF) = COMMAND_LINE_MAGIC; - *(u16*)(setup_base + CMD_LINE_OFFSET_OFF) = COMMAND_LINE_OFFSET; + *(u16*)(setup_base + CMD_LINE_OFFSET_OFF) = COMMAND_LINE_OFFSET; *(u16*)(setup_base + SETUP_MOVE_SIZE_OFF) = 0x9100; } - - + if (big_image) { - if ((kernel_size - setup_size) > BZIMAGE_MAX_SIZE) { + if ((kernel_size - setup_size) > BZIMAGE_MAX_SIZE) { printf("Error: bzImage kernel too big! (size: %ld, max: %d)\n", kernel_size - setup_size, BZIMAGE_MAX_SIZE); return 0; } - + } else if ((kernel_size - setup_size) > ZIMAGE_MAX_SIZE) { printf("Error: zImage kernel too big! (size: %ld, max: %d)\n", kernel_size - setup_size, ZIMAGE_MAX_SIZE); return 0; } - + /* build command line at COMMAND_LINE_OFFSET */ build_command_line(setup_base + COMMAND_LINE_OFFSET, auto_boot); - - printf("Loading %czImage at address 0x%08x (%ld bytes)\n", big_image ? 'b' : ' ', + + printf("Loading %czImage at address 0x%08x (%ld bytes)\n", big_image ? 'b' : ' ', (u32)load_address, kernel_size - setup_size); - + memmove(load_address, image + setup_size, kernel_size - setup_size); - + /* ready for booting */ return setup_base; } @@ -217,7 +216,7 @@ void *load_zimage(char *image, unsigned long kernel_size, void boot_zimage(void *setup_base) { struct pt_regs regs; - + memset(®s, 0, sizeof(struct pt_regs)); regs.xds = (u32)setup_base >> 4; regs.xss = 0x9000; @@ -228,18 +227,18 @@ void boot_zimage(void *setup_base) image_header_t *fake_zimage_header(image_header_t *hdr, void *ptr, int size) -{ +{ /* There is no way to know the size of a zImage ... * * so we assume that 2MB will be enough for now */ #define ZIMAGE_SIZE 0x200000 - + /* load a 1MB, the loaded will have to be moved to its final * position again later... */ #define ZIMAGE_LOAD 0x100000 - + ulong checksum; - - if (KERNEL_MAGIC != *(u16*)(ptr + BOOT_FLAG_OFF)) { + + if (KERNEL_MAGIC != *(u16*)(ptr + BOOT_FLAG_OFF)) { /* not a zImage or bzImage */ return NULL; } @@ -247,13 +246,13 @@ image_header_t *fake_zimage_header(image_header_t *hdr, void *ptr, int size) if (-1 == size) { size = ZIMAGE_SIZE; } -#if 0 +#if 0 checksum = crc32 (0, ptr, size); #else checksum = 0; -#endif +#endif memset(hdr, 0, sizeof(image_header_t)); - + /* Build new header */ hdr->ih_magic = htonl(IH_MAGIC); hdr->ih_time = 0; @@ -271,6 +270,6 @@ image_header_t *fake_zimage_header(image_header_t *hdr, void *ptr, int size) checksum = crc32(0,(const char *)hdr,sizeof(image_header_t)); hdr->ih_hcrc = htonl(checksum); - + return hdr; } |