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