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qemu/hw/arm_boot.c
Peter Maydell 756ba3b012 hw/arm_boot.c: move initrd load address up to accommodate large kernels 
Newer kernels are large enough that they can overlap the address
where qemu places the initrd. Move the initrd up so that there is
enough space for the kernel again.

Unfortunately it's not possible to automatically determine the
size of the kernel if it is compressed, so this is the best we
can do.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
2011-04-20 13:01:04 +02:00

291 lines
8.5 KiB
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"
#include "loader.h"
#include "elf.h"
#define KERNEL_ARGS_ADDR 0x100
#define KERNEL_LOAD_ADDR 0x00010000
#define INITRD_LOAD_ADDR 0x00d00000
/* 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[] = {
0xe59f0020, /* ldr r0, privbase */
0xe3a01001, /* mov r1, #1 */
0xe5801100, /* str r1, [r0, #0x100] */
0xe3a00201, /* mov r0, #0x10000000 */
0xe3800030, /* orr r0, #0x30 */
0xe320f003, /* wfi */
0xe5901000, /* ldr r1, [r0] */
0xe1110001, /* tst r1, r1 */
0x0afffffb, /* beq <wfi> */
0xe12fff11, /* bx r1 */
0 /* privbase: Private memory region base address. */
};
#define WRITE_WORD(p, value) do { \
stl_phys_notdirty(p, value); \
p += 4; \
} while (0)
static void set_kernel_args(struct arm_boot_info *info,
int initrd_size, target_phys_addr_t base)
{
target_phys_addr_t p;
p = base + KERNEL_ARGS_ADDR;
/* ATAG_CORE */
WRITE_WORD(p, 5);
WRITE_WORD(p, 0x54410001);
WRITE_WORD(p, 1);
WRITE_WORD(p, 0x1000);
WRITE_WORD(p, 0);
/* ATAG_MEM */
/* TODO: handle multiple chips on one ATAG list */
WRITE_WORD(p, 4);
WRITE_WORD(p, 0x54410002);
WRITE_WORD(p, info->ram_size);
WRITE_WORD(p, info->loader_start);
if (initrd_size) {
/* ATAG_INITRD2 */
WRITE_WORD(p, 4);
WRITE_WORD(p, 0x54420005);
WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
WRITE_WORD(p, initrd_size);
}
if (info->kernel_cmdline && *info->kernel_cmdline) {
/* ATAG_CMDLINE */
int cmdline_size;
cmdline_size = strlen(info->kernel_cmdline);
cpu_physical_memory_write(p + 8, (void *)info->kernel_cmdline,
cmdline_size + 1);
cmdline_size = (cmdline_size >> 2) + 1;
WRITE_WORD(p, cmdline_size + 2);
WRITE_WORD(p, 0x54410009);
p += cmdline_size * 4;
}
if (info->atag_board) {
/* ATAG_BOARD */
int atag_board_len;
uint8_t atag_board_buf[0x1000];
atag_board_len = (info->atag_board(info, atag_board_buf) + 3) & ~3;
WRITE_WORD(p, (atag_board_len + 8) >> 2);
WRITE_WORD(p, 0x414f4d50);
cpu_physical_memory_write(p, atag_board_buf, atag_board_len);
p += atag_board_len;
}
/* ATAG_END */
WRITE_WORD(p, 0);
WRITE_WORD(p, 0);
}
static void set_kernel_args_old(struct arm_boot_info *info,
int initrd_size, target_phys_addr_t base)
{
target_phys_addr_t p;
const char *s;
/* see linux/include/asm-arm/setup.h */
p = base + KERNEL_ARGS_ADDR;
/* page_size */
WRITE_WORD(p, 4096);
/* nr_pages */
WRITE_WORD(p, info->ram_size / 4096);
/* ramdisk_size */
WRITE_WORD(p, 0);
#define FLAG_READONLY 1
#define FLAG_RDLOAD 4
#define FLAG_RDPROMPT 8
/* flags */
WRITE_WORD(p, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT);
/* rootdev */
WRITE_WORD(p, (31 << 8) | 0); /* /dev/mtdblock0 */
/* video_num_cols */
WRITE_WORD(p, 0);
/* video_num_rows */
WRITE_WORD(p, 0);
/* video_x */
WRITE_WORD(p, 0);
/* video_y */
WRITE_WORD(p, 0);
/* memc_control_reg */
WRITE_WORD(p, 0);
/* unsigned char sounddefault */
/* unsigned char adfsdrives */
/* unsigned char bytes_per_char_h */
/* unsigned char bytes_per_char_v */
WRITE_WORD(p, 0);
/* pages_in_bank[4] */
WRITE_WORD(p, 0);
WRITE_WORD(p, 0);
WRITE_WORD(p, 0);
WRITE_WORD(p, 0);
/* pages_in_vram */
WRITE_WORD(p, 0);
/* initrd_start */
if (initrd_size)
WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
else
WRITE_WORD(p, 0);
/* initrd_size */
WRITE_WORD(p, initrd_size);
/* rd_start */
WRITE_WORD(p, 0);
/* system_rev */
WRITE_WORD(p, 0);
/* system_serial_low */
WRITE_WORD(p, 0);
/* system_serial_high */
WRITE_WORD(p, 0);
/* mem_fclk_21285 */
WRITE_WORD(p, 0);
/* zero unused fields */
while (p < base + KERNEL_ARGS_ADDR + 256 + 1024) {
WRITE_WORD(p, 0);
}
s = info->kernel_cmdline;
if (s) {
cpu_physical_memory_write(p, (void *)s, strlen(s) + 1);
} else {
WRITE_WORD(p, 0);
}
}
static void do_cpu_reset(void *opaque)
{
CPUState *env = opaque;
struct arm_boot_info *info = env->boot_info;
cpu_reset(env);
if (info) {
if (!info->is_linux) {
/* Jump to the entry point. */
env->regs[15] = info->entry & 0xfffffffe;
env->thumb = info->entry & 1;
} else {
if (env == first_cpu) {
env->regs[15] = info->loader_start;
if (old_param) {
set_kernel_args_old(info, info->initrd_size,
info->loader_start);
} else {
set_kernel_args(info, info->initrd_size,
info->loader_start);
}
} else {
env->regs[15] = info->smp_loader_start;
}
}
}
}
void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
{
int kernel_size;
int initrd_size;
int n;
int is_linux = 0;
uint64_t elf_entry;
target_phys_addr_t entry;
int big_endian;
/* Load the kernel. */
if (!info->kernel_filename) {
fprintf(stderr, "Kernel image must be specified\n");
exit(1);
}
if (info->nb_cpus == 0)
info->nb_cpus = 1;
#ifdef TARGET_WORDS_BIGENDIAN
big_endian = 1;
#else
big_endian = 0;
#endif
/* Assume that raw images are linux kernels, and ELF images are not. */
kernel_size = load_elf(info->kernel_filename, NULL, NULL, &elf_entry,
NULL, NULL, big_endian, ELF_MACHINE, 1);
entry = elf_entry;
if (kernel_size < 0) {
kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
&is_linux);
}
if (kernel_size < 0) {
entry = info->loader_start + KERNEL_LOAD_ADDR;
kernel_size = load_image_targphys(info->kernel_filename, entry,
ram_size - KERNEL_LOAD_ADDR);
is_linux = 1;
}
if (kernel_size < 0) {
fprintf(stderr, "qemu: could not load kernel '%s'\n",
info->kernel_filename);
exit(1);
}
info->entry = entry;
if (is_linux) {
if (info->initrd_filename) {
initrd_size = load_image_targphys(info->initrd_filename,
info->loader_start
+ INITRD_LOAD_ADDR,
ram_size - INITRD_LOAD_ADDR);
if (initrd_size < 0) {
fprintf(stderr, "qemu: could not load initrd '%s'\n",
info->initrd_filename);
exit(1);
}
} else {
initrd_size = 0;
}
bootloader[1] |= info->board_id & 0xff;
bootloader[2] |= (info->board_id >> 8) & 0xff;
bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;
bootloader[6] = entry;
for (n = 0; n < sizeof(bootloader) / 4; n++) {
bootloader[n] = tswap32(bootloader[n]);
}
rom_add_blob_fixed("bootloader", bootloader, sizeof(bootloader),
info->loader_start);
if (info->nb_cpus > 1) {
smpboot[10] = info->smp_priv_base;
for (n = 0; n < sizeof(smpboot) / 4; n++) {
smpboot[n] = tswap32(smpboot[n]);
}
rom_add_blob_fixed("smpboot", smpboot, sizeof(smpboot),
info->smp_loader_start);
}
info->initrd_size = initrd_size;
}
info->is_linux = is_linux;
for (; env; env = env->next_cpu) {
env->boot_info = info;
qemu_register_reset(do_cpu_reset, env);
}
}
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