4 * Copyright (c) 2006-2007 CodeSourcery.
5 * Written by Paul Brook
7 * This code is licenced under the GPL.
14 #define KERNEL_ARGS_ADDR 0x100
15 #define KERNEL_LOAD_ADDR 0x00010000
16 #define INITRD_LOAD_ADDR 0x00800000
18 /* The worlds second smallest bootloader. Set r0-r2, then jump to kernel. */
19 static uint32_t bootloader[] = {
20 0xe3a00000, /* mov r0, #0 */
21 0xe3a01000, /* mov r1, #0x?? */
22 0xe3811c00, /* orr r1, r1, #0x??00 */
23 0xe59f2000, /* ldr r2, [pc, #0] */
24 0xe59ff000, /* ldr pc, [pc, #0] */
25 0, /* Address of kernel args. Set by integratorcp_init. */
26 0 /* Kernel entry point. Set by integratorcp_init. */
29 /* Entry point for secondary CPUs. Enable interrupt controller and
30 Issue WFI until start address is written to system controller. */
31 static uint32_t smpboot[] = {
32 0xe3a00201, /* mov r0, #0x10000000 */
33 0xe3800601, /* orr r0, r0, #0x001000000 */
34 0xe3a01001, /* mov r1, #1 */
35 0xe5801100, /* str r1, [r0, #0x100] */
36 0xe3a00201, /* mov r0, #0x10000000 */
37 0xe3800030, /* orr r0, #0x30 */
39 0xe5901000, /* ldr r1, [r0] */
40 0xe3110003, /* tst r1, #3 */
41 0x1afffffb, /* bne <wfi> */
42 0xe12fff11 /* bx r1 */
45 static void main_cpu_reset(void *opaque)
47 CPUState *env = opaque;
51 arm_load_kernel(env, env->boot_info);
53 /* TODO: Reset secondary CPUs. */
56 #define WRITE_WORD(p, value) do { \
57 stl_phys_notdirty(p, value); \
61 static void set_kernel_args(struct arm_boot_info *info,
62 int initrd_size, target_phys_addr_t base)
66 p = base + KERNEL_ARGS_ADDR;
69 WRITE_WORD(p, 0x54410001);
71 WRITE_WORD(p, 0x1000);
74 /* TODO: handle multiple chips on one ATAG list */
76 WRITE_WORD(p, 0x54410002);
77 WRITE_WORD(p, info->ram_size);
78 WRITE_WORD(p, info->loader_start);
82 WRITE_WORD(p, 0x54420005);
83 WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
84 WRITE_WORD(p, initrd_size);
86 if (info->kernel_cmdline && *info->kernel_cmdline) {
90 cmdline_size = strlen(info->kernel_cmdline);
91 cpu_physical_memory_write(p + 8, (void *)info->kernel_cmdline,
93 cmdline_size = (cmdline_size >> 2) + 1;
94 WRITE_WORD(p, cmdline_size + 2);
95 WRITE_WORD(p, 0x54410009);
96 p += cmdline_size * 4;
98 if (info->atag_board) {
101 uint8_t atag_board_buf[0x1000];
103 atag_board_len = (info->atag_board(info, atag_board_buf) + 3) & ~3;
104 WRITE_WORD(p, (atag_board_len + 8) >> 2);
105 WRITE_WORD(p, 0x414f4d50);
106 cpu_physical_memory_write(p, atag_board_buf, atag_board_len);
114 static void set_kernel_args_old(struct arm_boot_info *info,
115 int initrd_size, target_phys_addr_t base)
117 target_phys_addr_t p;
121 /* see linux/include/asm-arm/setup.h */
122 p = base + KERNEL_ARGS_ADDR;
126 WRITE_WORD(p, info->ram_size / 4096);
129 #define FLAG_READONLY 1
130 #define FLAG_RDLOAD 4
131 #define FLAG_RDPROMPT 8
133 WRITE_WORD(p, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT);
135 WRITE_WORD(p, (31 << 8) | 0); /* /dev/mtdblock0 */
144 /* memc_control_reg */
146 /* unsigned char sounddefault */
147 /* unsigned char adfsdrives */
148 /* unsigned char bytes_per_char_h */
149 /* unsigned char bytes_per_char_v */
151 /* pages_in_bank[4] */
160 WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
164 WRITE_WORD(p, initrd_size);
169 /* system_serial_low */
171 /* system_serial_high */
175 /* zero unused fields */
176 while (p < base + KERNEL_ARGS_ADDR + 256 + 1024) {
179 s = info->kernel_cmdline;
181 cpu_physical_memory_write(p, (void *)s, strlen(s) + 1);
187 void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
196 /* Load the kernel. */
197 if (!info->kernel_filename) {
198 fprintf(stderr, "Kernel image must be specified\n");
202 if (!env->boot_info) {
203 if (info->nb_cpus == 0)
205 env->boot_info = info;
206 qemu_register_reset(main_cpu_reset, 0, env);
209 /* Assume that raw images are linux kernels, and ELF images are not. */
210 kernel_size = load_elf(info->kernel_filename, 0, &elf_entry, NULL, NULL);
212 if (kernel_size < 0) {
213 kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
216 if (kernel_size < 0) {
217 entry = info->loader_start + KERNEL_LOAD_ADDR;
218 kernel_size = load_image_targphys(info->kernel_filename, entry,
219 ram_size - KERNEL_LOAD_ADDR);
222 if (kernel_size < 0) {
223 fprintf(stderr, "qemu: could not load kernel '%s'\n",
224 info->kernel_filename);
228 /* Jump to the entry point. */
229 env->regs[15] = entry & 0xfffffffe;
230 env->thumb = entry & 1;
232 if (info->initrd_filename) {
233 initrd_size = load_image_targphys(info->initrd_filename,
236 ram_size - INITRD_LOAD_ADDR);
237 if (initrd_size < 0) {
238 fprintf(stderr, "qemu: could not load initrd '%s'\n",
239 info->initrd_filename);
245 bootloader[1] |= info->board_id & 0xff;
246 bootloader[2] |= (info->board_id >> 8) & 0xff;
247 bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;
248 bootloader[6] = entry;
249 for (n = 0; n < sizeof(bootloader) / 4; n++) {
250 stl_phys_notdirty(info->loader_start + (n * 4), bootloader[n]);
252 if (info->nb_cpus > 1) {
253 for (n = 0; n < sizeof(smpboot) / 4; n++) {
254 stl_phys_notdirty(info->smp_loader_start + (n * 4), smpboot[n]);
258 set_kernel_args_old(info, initrd_size, info->loader_start);
260 set_kernel_args(info, initrd_size, info->loader_start);