root / hw / arm_boot.c @ 6693665a
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/*
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* ARM kernel loader.
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*
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* Copyright (c) 2006-2007 CodeSourcery.
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* Written by Paul Brook
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*
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* This code is licenced under the GPL.
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*/
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#include "hw.h" |
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#include "arm-misc.h" |
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#include "sysemu.h" |
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#define KERNEL_ARGS_ADDR 0x100 |
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#define KERNEL_LOAD_ADDR 0x00010000 |
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#define INITRD_LOAD_ADDR 0x00800000 |
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/* The worlds second smallest bootloader. Set r0-r2, then jump to kernel. */
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static uint32_t bootloader[] = {
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0xe3a00000, /* mov r0, #0 */ |
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0xe3a01000, /* mov r1, #0x?? */ |
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0xe3811c00, /* orr r1, r1, #0x??00 */ |
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0xe59f2000, /* ldr r2, [pc, #0] */ |
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0xe59ff000, /* ldr pc, [pc, #0] */ |
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0, /* Address of kernel args. Set by integratorcp_init. */ |
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0 /* Kernel entry point. Set by integratorcp_init. */ |
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}; |
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/* Entry point for secondary CPUs. Enable interrupt controller and
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Issue WFI until start address is written to system controller. */
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static uint32_t smpboot[] = {
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0xe3a00201, /* mov r0, #0x10000000 */ |
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0xe3800601, /* orr r0, r0, #0x001000000 */ |
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0xe3a01001, /* mov r1, #1 */ |
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0xe5801100, /* str r1, [r0, #0x100] */ |
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0xe3a00201, /* mov r0, #0x10000000 */ |
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0xe3800030, /* orr r0, #0x30 */ |
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0xe320f003, /* wfi */ |
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0xe5901000, /* ldr r1, [r0] */ |
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0xe3110003, /* tst r1, #3 */ |
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0x1afffffb, /* bne <wfi> */ |
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0xe12fff11 /* bx r1 */ |
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}; |
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static void main_cpu_reset(void *opaque) |
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{
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CPUState *env = opaque; |
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cpu_reset(env); |
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if (env->boot_info)
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arm_load_kernel(env, env->boot_info); |
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/* TODO: Reset secondary CPUs. */
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} |
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#define WRITE_WORD(p, value) do { \ |
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stl_phys_notdirty(p, value); \ |
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p += 4; \
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} while (0) |
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static void set_kernel_args(struct arm_boot_info *info, |
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int initrd_size, target_phys_addr_t base)
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{
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target_phys_addr_t p; |
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p = base + KERNEL_ARGS_ADDR; |
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/* ATAG_CORE */
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WRITE_WORD(p, 5);
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WRITE_WORD(p, 0x54410001);
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WRITE_WORD(p, 1);
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WRITE_WORD(p, 0x1000);
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WRITE_WORD(p, 0);
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/* ATAG_MEM */
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/* TODO: handle multiple chips on one ATAG list */
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WRITE_WORD(p, 4);
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WRITE_WORD(p, 0x54410002);
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WRITE_WORD(p, info->ram_size); |
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WRITE_WORD(p, info->loader_start); |
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if (initrd_size) {
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/* ATAG_INITRD2 */
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WRITE_WORD(p, 4);
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WRITE_WORD(p, 0x54420005);
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WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR); |
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WRITE_WORD(p, initrd_size); |
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} |
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if (info->kernel_cmdline && *info->kernel_cmdline) {
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/* ATAG_CMDLINE */
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int cmdline_size;
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cmdline_size = strlen(info->kernel_cmdline); |
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cpu_physical_memory_write(p + 8, (void *)info->kernel_cmdline, |
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cmdline_size + 1);
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cmdline_size = (cmdline_size >> 2) + 1; |
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WRITE_WORD(p, cmdline_size + 2);
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WRITE_WORD(p, 0x54410009);
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p += cmdline_size * 4;
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} |
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if (info->atag_board) {
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/* ATAG_BOARD */
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int atag_board_len;
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uint8_t atag_board_buf[0x1000];
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atag_board_len = (info->atag_board(info, atag_board_buf) + 3) & ~3; |
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WRITE_WORD(p, (atag_board_len + 8) >> 2); |
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WRITE_WORD(p, 0x414f4d50);
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cpu_physical_memory_write(p, atag_board_buf, atag_board_len); |
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p += atag_board_len; |
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} |
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/* ATAG_END */
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WRITE_WORD(p, 0);
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WRITE_WORD(p, 0);
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} |
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static void set_kernel_args_old(struct arm_boot_info *info, |
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int initrd_size, target_phys_addr_t base)
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{
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target_phys_addr_t p; |
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const char *s; |
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/* see linux/include/asm-arm/setup.h */
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p = base + KERNEL_ARGS_ADDR; |
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/* page_size */
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WRITE_WORD(p, 4096);
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/* nr_pages */
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WRITE_WORD(p, info->ram_size / 4096);
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/* ramdisk_size */
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WRITE_WORD(p, 0);
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#define FLAG_READONLY 1 |
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#define FLAG_RDLOAD 4 |
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#define FLAG_RDPROMPT 8 |
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/* flags */
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WRITE_WORD(p, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT); |
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/* rootdev */
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WRITE_WORD(p, (31 << 8) | 0); /* /dev/mtdblock0 */ |
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/* video_num_cols */
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WRITE_WORD(p, 0);
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/* video_num_rows */
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WRITE_WORD(p, 0);
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/* video_x */
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WRITE_WORD(p, 0);
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/* video_y */
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WRITE_WORD(p, 0);
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/* memc_control_reg */
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WRITE_WORD(p, 0);
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/* unsigned char sounddefault */
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/* unsigned char adfsdrives */
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/* unsigned char bytes_per_char_h */
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/* unsigned char bytes_per_char_v */
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WRITE_WORD(p, 0);
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/* pages_in_bank[4] */
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WRITE_WORD(p, 0);
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WRITE_WORD(p, 0);
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WRITE_WORD(p, 0);
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WRITE_WORD(p, 0);
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/* pages_in_vram */
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WRITE_WORD(p, 0);
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/* initrd_start */
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if (initrd_size)
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WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR); |
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else
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WRITE_WORD(p, 0);
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/* initrd_size */
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WRITE_WORD(p, initrd_size); |
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/* rd_start */
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WRITE_WORD(p, 0);
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/* system_rev */
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WRITE_WORD(p, 0);
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/* system_serial_low */
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WRITE_WORD(p, 0);
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/* system_serial_high */
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WRITE_WORD(p, 0);
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/* mem_fclk_21285 */
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WRITE_WORD(p, 0);
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/* zero unused fields */
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while (p < base + KERNEL_ARGS_ADDR + 256 + 1024) { |
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WRITE_WORD(p, 0);
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} |
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s = info->kernel_cmdline; |
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if (s) {
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cpu_physical_memory_write(p, (void *)s, strlen(s) + 1); |
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} else {
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WRITE_WORD(p, 0);
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} |
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} |
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void arm_load_kernel(CPUState *env, struct arm_boot_info *info) |
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{
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int kernel_size;
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int initrd_size;
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int n;
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int is_linux = 0; |
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uint64_t elf_entry; |
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target_ulong entry; |
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/* Load the kernel. */
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if (!info->kernel_filename) {
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fprintf(stderr, "Kernel image must be specified\n");
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exit(1);
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} |
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if (!env->boot_info) {
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if (info->nb_cpus == 0) |
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info->nb_cpus = 1;
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env->boot_info = info; |
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qemu_register_reset(main_cpu_reset, 0, env);
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} |
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/* Assume that raw images are linux kernels, and ELF images are not. */
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kernel_size = load_elf(info->kernel_filename, 0, &elf_entry, NULL, NULL); |
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entry = elf_entry; |
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if (kernel_size < 0) { |
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kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
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&is_linux); |
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} |
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if (kernel_size < 0) { |
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entry = info->loader_start + KERNEL_LOAD_ADDR; |
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kernel_size = load_image_targphys(info->kernel_filename, entry, |
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ram_size - KERNEL_LOAD_ADDR); |
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is_linux = 1;
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} |
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if (kernel_size < 0) { |
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fprintf(stderr, "qemu: could not load kernel '%s'\n",
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info->kernel_filename); |
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exit(1);
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} |
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if (!is_linux) {
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/* Jump to the entry point. */
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env->regs[15] = entry & 0xfffffffe; |
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env->thumb = entry & 1;
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} else {
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if (info->initrd_filename) {
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initrd_size = load_image_targphys(info->initrd_filename, |
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info->loader_start |
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+ INITRD_LOAD_ADDR, |
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ram_size - INITRD_LOAD_ADDR); |
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if (initrd_size < 0) { |
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fprintf(stderr, "qemu: could not load initrd '%s'\n",
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info->initrd_filename); |
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exit(1);
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} |
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} else {
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initrd_size = 0;
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} |
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bootloader[1] |= info->board_id & 0xff; |
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bootloader[2] |= (info->board_id >> 8) & 0xff; |
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bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;
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bootloader[6] = entry;
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for (n = 0; n < sizeof(bootloader) / 4; n++) { |
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stl_phys_notdirty(info->loader_start + (n * 4), bootloader[n]);
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} |
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if (info->nb_cpus > 1) { |
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for (n = 0; n < sizeof(smpboot) / 4; n++) { |
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stl_phys_notdirty(info->smp_loader_start + (n * 4), smpboot[n]);
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} |
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} |
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if (old_param)
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set_kernel_args_old(info, initrd_size, info->loader_start); |
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else
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set_kernel_args(info, initrd_size, info->loader_start); |
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} |
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} |