106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
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/*
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* ARM kernel loader.
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*
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* Copyright (c) 2006 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 "vl.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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static void set_kernel_args(uint32_t ram_size, int initrd_size,
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const char *kernel_cmdline)
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{
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uint32_t *p;
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p = (uint32_t *)(phys_ram_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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stl_raw(p++, 4);
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stl_raw(p++, 0x54410002);
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stl_raw(p++, ram_size);
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stl_raw(p++, 0);
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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++, INITRD_LOAD_ADDR);
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stl_raw(p++, initrd_size);
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}
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if (kernel_cmdline && *kernel_cmdline) {
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/* ATAG_CMDLINE */
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int cmdline_size;
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cmdline_size = strlen(kernel_cmdline);
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memcpy (p + 2, 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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/* 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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void arm_load_kernel(int ram_size, const char *kernel_filename,
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const char *kernel_cmdline, const char *initrd_filename,
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int board_id)
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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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/* Load the kernel. */
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if (!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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kernel_size = load_image(kernel_filename,
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phys_ram_base + KERNEL_LOAD_ADDR);
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if (kernel_size < 0) {
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fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
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exit(1);
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}
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if (initrd_filename) {
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initrd_size = load_image(initrd_filename,
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phys_ram_base + 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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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] |= board_id & 0xff;
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bootloader[2] |= (board_id >> 8) & 0xff;
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bootloader[5] = KERNEL_ARGS_ADDR;
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bootloader[6] = KERNEL_LOAD_ADDR;
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for (n = 0; n < sizeof(bootloader) / 4; n++)
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stl_raw(phys_ram_base + (n * 4), bootloader[n]);
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set_kernel_args(ram_size, initrd_size, kernel_cmdline);
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}
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