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Pass parameters to make_fiwix_initrd and kexec-fiwix
This extends make_fiwix_initrd and kexec-fiwix to support command line parameters, instead of hardcoding relevant values within the C sources. This way, it becomes possible to alter e.g. ramdisk size without affecting checksums. While we're at it, also support loading a memory map from file.
This commit is contained in:
Gábor Stefanik
parent
bbb96a52d6
commit
9e4c17b68d
5 changed files with 150 additions and 84 deletions
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@ -6,14 +6,68 @@
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#include "multiboot1.h"
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#define MULTIBOOT_MAGIC 0x2BADB002
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#define INITRD_MB 1280
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#define KEXEC_MB 256
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int main() {
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multiboot_uint32_t get_memmap(char *filename, void *memmap_addr) {
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if (!filename) {
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return 0;
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}
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multiboot_uint32_t memmap_length = 0;
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FILE *memmap_file = fopen(filename, "r");
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if (!memmap_file) {
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return 0;
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}
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fseek(memmap_file, 0, SEEK_END);
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memmap_length = ftell(memmap_file);
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if (!memmap_length) {
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fclose(memmap_file);
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return 0;
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}
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printf("kexec-fiwix: Memory map file length: %d\n", memmap_length);
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puts("kexec-fiwix: Reading memory map file...");
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fseek(memmap_file, 0, SEEK_SET);
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int memmap_read_len = fread(memmap_addr, memmap_length, 1, memmap_file);
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fclose(memmap_file);
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if (memmap_read_len < 1) {
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printf("kexec-fiwix: memory map fread error: %d\n", memmap_read_len);
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return 0;
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}
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return memmap_length;
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}
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int main(int argc, char **argv) {
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char *fiwix_filename = "/boot/fiwix";
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char *initrd_filename = "/boot/fiwix.ext2";
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char *cmdline = NULL;
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char *memmap = NULL;
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int i;
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for (i = 1; i < argc; i++) {
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if (!strcmp(argv[i], "-c")) {
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i++;
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cmdline = argv[i];
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} else if (!strcmp(argv[i], "-i")) {
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i++;
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initrd_filename = argv[i];
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} else if (!strcmp(argv[i], "-m")) {
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i++;
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memmap = argv[i];
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} else {
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fiwix_filename = argv[i];
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}
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}
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/* Read the kernel */
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printf("kexec-fiwix: starting...\n\n");
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FILE *fiwix_file = fopen("/boot/fiwix", "r");
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printf("kexec-fiwix: starting kernel %s...\n\n", fiwix_filename);
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FILE *fiwix_file = fopen(fiwix_filename, "r");
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fseek(fiwix_file, 0, SEEK_END);
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int fiwix_len = ftell(fiwix_file);
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printf("kexec-fiwix: Fiwix kernel file length: %d\n", fiwix_len);
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@ -77,17 +131,6 @@ int main() {
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puts("Preparing multiboot info for kernel...");
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char cmdline[256];
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/* Don't use a serial console if configured for bare metal */
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char *bare_metal = getenv("BARE_METAL");
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if (bare_metal != NULL && strcmp(bare_metal, "True") == 0)
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{
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sprintf(cmdline, "fiwix console=/dev/tty1 root=/dev/ram0 ramdisksize=%d initrd=fiwix.ext2 kexec_proto=linux kexec_size=%d kexec_cmdline=\"init=/init consoleblank=0\"", INITRD_MB * 1024, KEXEC_MB * 1024);
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}
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else
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{
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sprintf(cmdline, "fiwix console=/dev/ttyS0 root=/dev/ram0 ramdisksize=%d initrd=fiwix.ext2 kexec_proto=linux kexec_size=%d kexec_cmdline=\"init=/init console=ttyS0\"", INITRD_MB * 1024, KEXEC_MB * 1024);
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}
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char * boot_loader_name = "kexec-fiwix";
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unsigned int next_avail_mem = 0x9800;
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@ -96,7 +139,6 @@ int main() {
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pmultiboot_info->flags = MULTIBOOT_INFO_BOOT_LOADER_NAME
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| MULTIBOOT_INFO_MEMORY
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| MULTIBOOT_INFO_CMDLINE
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| MULTIBOOT_INFO_MODS
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| MULTIBOOT_INFO_MEM_MAP;
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@ -106,16 +148,33 @@ int main() {
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pmultiboot_info->mem_upper = 0x002FFB80;
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/* Set command line */
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pmultiboot_info->cmdline = next_avail_mem;
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strcpy((char *) next_avail_mem, cmdline);
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next_avail_mem += (strlen(cmdline) + 1);
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if (cmdline != NULL) {
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pmultiboot_info->flags = pmultiboot_info->flags | MULTIBOOT_INFO_CMDLINE;
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pmultiboot_info->cmdline = next_avail_mem;
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strcpy((char *) next_avail_mem, cmdline);
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next_avail_mem += (strlen(cmdline) + 1);
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}
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int filenum;
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unsigned int filename_addr;
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for (filenum = 4, filename_addr = 0x201000; filenum <= 14335; filenum++, filename_addr += 1024) {
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if (!strcmp((char *) filename_addr, initrd_filename)) {
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printf("Found image at filenum %d\n", filenum);
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break;
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}
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}
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unsigned int initrd_src = *((unsigned int *) (0x01000000 + (16 * filenum) + 4));
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unsigned int initrd_len = *((unsigned int *) (0x01000000 + (16 * filenum) + 8));
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printf("initrd_src: 0x%08x\n", initrd_src);
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printf("initrd_len: 0x%08x\n", initrd_len);
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/* Set ramdrive info */
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pmultiboot_info->mods_count = 1;
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pmultiboot_info->mods_addr = next_avail_mem;
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multiboot_module_t *pmultiboot_module = (multiboot_module_t *) next_avail_mem;
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pmultiboot_module->mod_start = 0x1C6000;
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pmultiboot_module->mod_end = 0x1C6000 + (INITRD_MB * 1024 * 1024);
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pmultiboot_module->mod_end = 0x1C6000 + initrd_len;
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next_avail_mem += sizeof(multiboot_module_t);
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pmultiboot_module->cmdline = next_avail_mem;
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strcpy((char *) next_avail_mem, "fiwix.ext2");
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@ -123,50 +182,55 @@ int main() {
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/* Set memory map info */
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pmultiboot_info->mmap_addr = next_avail_mem;
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pmultiboot_info->mmap_length = 7 * sizeof(multiboot_memory_map_t);
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multiboot_memory_map_t *pmultiboot_memory_map = (multiboot_memory_map_t *) next_avail_mem;
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pmultiboot_info->mmap_length = get_memmap(memmap, (void *) pmultiboot_info->mmap_addr);
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0x00000000;
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pmultiboot_memory_map->len = 0x00080000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_AVAILABLE;
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pmultiboot_memory_map++;
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/* if we have no memory map, fall back to a safe default */
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if (pmultiboot_info->mmap_length == 0) {
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pmultiboot_info->mmap_length = 7 * sizeof(multiboot_memory_map_t);
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multiboot_memory_map_t *pmultiboot_memory_map = (multiboot_memory_map_t *) next_avail_mem;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0x00080000;
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pmultiboot_memory_map->len = 0x00020000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_RESERVED;
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pmultiboot_memory_map++;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0x00000000;
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pmultiboot_memory_map->len = 0x00080000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_AVAILABLE;
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pmultiboot_memory_map++;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0x000F0000;
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pmultiboot_memory_map->len = 0x00010000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_RESERVED;
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pmultiboot_memory_map++;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0x00080000;
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pmultiboot_memory_map->len = 0x00020000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_RESERVED;
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pmultiboot_memory_map++;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0x00100000;
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pmultiboot_memory_map->len = 0xBC000000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_AVAILABLE;
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pmultiboot_memory_map++;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0x000F0000;
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pmultiboot_memory_map->len = 0x00010000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_RESERVED;
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pmultiboot_memory_map++;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0XBC000000;
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pmultiboot_memory_map->len = 0x04000000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_RESERVED;
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pmultiboot_memory_map++;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0x00100000;
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pmultiboot_memory_map->len = 0xBBF00000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_AVAILABLE;
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pmultiboot_memory_map++;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0XFEFFC000;
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pmultiboot_memory_map->len = 0x00004000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_RESERVED;
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pmultiboot_memory_map++;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0XBC000000;
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pmultiboot_memory_map->len = 0x04000000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_RESERVED;
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pmultiboot_memory_map++;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0XFFFC0000;
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pmultiboot_memory_map->len = 0x00040000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_RESERVED;
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pmultiboot_memory_map++;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0XFEFFC000;
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pmultiboot_memory_map->len = 0x00004000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_RESERVED;
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pmultiboot_memory_map++;
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pmultiboot_memory_map->size = sizeof(multiboot_memory_map_t) - sizeof(multiboot_uint32_t);
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pmultiboot_memory_map->addr = 0XFFFC0000;
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pmultiboot_memory_map->len = 0x00040000;
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pmultiboot_memory_map->type = MULTIBOOT_MEMORY_RESERVED;
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pmultiboot_memory_map++;
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}
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next_avail_mem += pmultiboot_info->mmap_length;
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@ -180,19 +244,6 @@ int main() {
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unsigned int dummy = 0;
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unsigned int multiboot_info_num = (unsigned int) pmultiboot_info;
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int filenum;
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unsigned int filename_addr;
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for (filenum = 4, filename_addr = 0x201000; filenum <= 14335; filenum++, filename_addr += 1024) {
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if (!strcmp((char *) filename_addr, "/boot/fiwix.ext2")) {
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printf("Found image at filenum %d\n", filenum);
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break;
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}
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}
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unsigned int initrd_src = *((unsigned int *) (0x01000000 + (16 * filenum) + 4));
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unsigned int initrd_len = *((unsigned int *) (0x01000000 + (16 * filenum) + 8));
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printf("initrd_src: 0x%08x\n", initrd_src);
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printf("initrd_len: 0x%08x\n", initrd_len);
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printf("Preparing trampoline...\n");
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/* The ramdrive needs to be written to a location that would overwrite this program.
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@ -216,7 +267,7 @@ int main() {
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/* Set place holder values */
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*((unsigned int *) &trampoline[1]) = initrd_src;
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*((unsigned int *) &trampoline[6]) = 0x001C6000;
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*((unsigned int *) &trampoline[11]) = INITRD_MB * 1024 * 1024;
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*((unsigned int *) &trampoline[11]) = initrd_len;
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*((unsigned int *) &trampoline[19]) = magic;
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*((unsigned int *) &trampoline[24]) = multiboot_info_num;
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*((unsigned int *) &trampoline[30]) = e_entry;
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