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https://github.com/xemu-project/xemu.git
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f93eb9ff66
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4212 c046a42c-6fe2-441c-8c8c-71466251a162
252 lines
7.2 KiB
C
252 lines
7.2 KiB
C
/*
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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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static void set_kernel_args(struct arm_boot_info *info,
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int initrd_size, void *base)
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{
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uint32_t *p;
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p = (uint32_t *)(base + KERNEL_ARGS_ADDR);
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/* ATAG_CORE */
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stl_raw(p++, 5);
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stl_raw(p++, 0x54410001);
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stl_raw(p++, 1);
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stl_raw(p++, 0x1000);
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stl_raw(p++, 0);
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/* ATAG_MEM */
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/* TODO: handle multiple chips on one ATAG list */
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stl_raw(p++, 4);
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stl_raw(p++, 0x54410002);
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stl_raw(p++, info->ram_size);
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stl_raw(p++, info->loader_start);
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if (initrd_size) {
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/* ATAG_INITRD2 */
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stl_raw(p++, 4);
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stl_raw(p++, 0x54420005);
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stl_raw(p++, info->loader_start + INITRD_LOAD_ADDR);
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stl_raw(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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memcpy(p + 2, info->kernel_cmdline, cmdline_size + 1);
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cmdline_size = (cmdline_size >> 2) + 1;
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stl_raw(p++, cmdline_size + 2);
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stl_raw(p++, 0x54410009);
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p += cmdline_size;
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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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atag_board_len = (info->atag_board(info, p + 2) + 3) >> 2;
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stl_raw(p++, 2 + atag_board_len);
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stl_raw(p++, 0x414f4d50);
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p += atag_board_len;
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}
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/* ATAG_END */
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stl_raw(p++, 0);
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stl_raw(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, void *base)
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{
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uint32_t *p;
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unsigned char *s;
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/* see linux/include/asm-arm/setup.h */
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p = (uint32_t *)(base + KERNEL_ARGS_ADDR);
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/* page_size */
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stl_raw(p++, 4096);
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/* nr_pages */
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stl_raw(p++, info->ram_size / 4096);
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/* ramdisk_size */
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stl_raw(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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stl_raw(p++, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT);
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/* rootdev */
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stl_raw(p++, (31 << 8) | 0); /* /dev/mtdblock0 */
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/* video_num_cols */
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stl_raw(p++, 0);
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/* video_num_rows */
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stl_raw(p++, 0);
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/* video_x */
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stl_raw(p++, 0);
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/* video_y */
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stl_raw(p++, 0);
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/* memc_control_reg */
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stl_raw(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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stl_raw(p++, 0);
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/* pages_in_bank[4] */
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stl_raw(p++, 0);
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stl_raw(p++, 0);
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stl_raw(p++, 0);
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stl_raw(p++, 0);
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/* pages_in_vram */
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stl_raw(p++, 0);
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/* initrd_start */
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if (initrd_size)
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stl_raw(p++, info->loader_start + INITRD_LOAD_ADDR);
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else
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stl_raw(p++, 0);
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/* initrd_size */
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stl_raw(p++, initrd_size);
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/* rd_start */
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stl_raw(p++, 0);
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/* system_rev */
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stl_raw(p++, 0);
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/* system_serial_low */
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stl_raw(p++, 0);
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/* system_serial_high */
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stl_raw(p++, 0);
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/* mem_fclk_21285 */
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stl_raw(p++, 0);
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/* zero unused fields */
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memset(p, 0, 256 + 1024 -
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(p - ((uint32_t *)(base + KERNEL_ARGS_ADDR))));
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s = base + KERNEL_ARGS_ADDR + 256 + 1024;
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if (info->kernel_cmdline)
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strcpy (s, info->kernel_cmdline);
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else
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stb_raw(s, 0);
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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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uint32_t pd;
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void *loader_phys;
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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, env);
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}
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pd = cpu_get_physical_page_desc(info->loader_start);
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loader_phys = phys_ram_base + (pd & TARGET_PAGE_MASK) +
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(info->loader_start & ~TARGET_PAGE_MASK);
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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_uboot(info->kernel_filename, &entry, &is_linux);
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}
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if (kernel_size < 0) {
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kernel_size = load_image(info->kernel_filename,
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loader_phys + KERNEL_LOAD_ADDR);
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entry = info->loader_start + 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(info->initrd_filename,
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loader_phys + 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_raw(loader_phys + (n * 4), bootloader[n]);
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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_raw(loader_phys + info->ram_size + (n * 4), smpboot[n]);
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if (old_param)
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set_kernel_args_old(info, initrd_size, loader_phys);
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else
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set_kernel_args(info, initrd_size, loader_phys);
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}
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}
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