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authorpbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>2006-04-27 23:15:07 +0000
committerpbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>2006-04-27 23:15:07 +0000
commit1640695026373034f9740ad1bcb69f27e584218c (patch)
tree88a22216f6246ffa58fd56f7fce203292515654d /hw/arm_boot.c
parent008a8818d91418254a94d7e5f6f66b1435a1edaf (diff)
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Add nominal ARM Versatil/AB board emulation.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1864 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'hw/arm_boot.c')
-rw-r--r--hw/arm_boot.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/hw/arm_boot.c b/hw/arm_boot.c
new file mode 100644
index 0000000..0e28d4a
--- /dev/null
+++ b/hw/arm_boot.c
@@ -0,0 +1,105 @@
+/*
+ * ARM kernel loader.
+ *
+ * Copyright (c) 2006 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licenced under the GPL.
+ */
+
+#include "vl.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. */
+};
+
+static void set_kernel_args(uint32_t ram_size, int initrd_size,
+ const char *kernel_cmdline)
+{
+ 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++, 0);
+ if (initrd_size) {
+ /* ATAG_INITRD2 */
+ stl_raw(p++, 4);
+ stl_raw(p++, 0x54420005);
+ stl_raw(p++, 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);
+}
+
+void arm_load_kernel(int ram_size, const char *kernel_filename,
+ const char *kernel_cmdline, const char *initrd_filename,
+ int board_id)
+{
+ int kernel_size;
+ int initrd_size;
+ int n;
+
+ /* Load the kernel. */
+ if (!kernel_filename) {
+ fprintf(stderr, "Kernel image must be specified\n");
+ exit(1);
+ }
+ kernel_size = load_image(kernel_filename,
+ phys_ram_base + KERNEL_LOAD_ADDR);
+ if (kernel_size < 0) {
+ fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
+ exit(1);
+ }
+ 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] = KERNEL_ARGS_ADDR;
+ bootloader[6] = KERNEL_LOAD_ADDR;
+ for (n = 0; n < sizeof(bootloader) / 4; n++)
+ stl_raw(phys_ram_base + (n * 4), bootloader[n]);
+ set_kernel_args(ram_size, initrd_size, kernel_cmdline);
+}
+