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-rw-r--r--arch/x86/lib/zimage.c296
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diff --git a/arch/x86/lib/zimage.c b/arch/x86/lib/zimage.c
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+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * Linux x86 zImage and bzImage loading
+ *
+ * based on the procdure described in
+ * linux/Documentation/i386/boot.txt
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/ptrace.h>
+#include <asm/zimage.h>
+#include <asm/realmode.h>
+#include <asm/byteorder.h>
+#include <asm/bootparam.h>
+#include <asm/ic/sc520.h>
+
+/*
+ * Memory lay-out:
+ *
+ * relative to setup_base (which is 0x90000 currently)
+ *
+ * 0x0000-0x7FFF Real mode kernel
+ * 0x8000-0x8FFF Stack and heap
+ * 0x9000-0x90FF Kernel command line
+ */
+#define DEFAULT_SETUP_BASE 0x90000
+#define COMMAND_LINE_OFFSET 0x9000
+#define HEAP_END_OFFSET 0x8e00
+
+#define COMMAND_LINE_SIZE 2048
+
+static void build_command_line(char *command_line, int auto_boot)
+{
+ char *env_command_line;
+
+ command_line[0] = '\0';
+
+ env_command_line = getenv("bootargs");
+
+ /* set console= argument if we use a serial console */
+ if (NULL == strstr(env_command_line, "console=")) {
+ if (0==strcmp(getenv("stdout"), "serial")) {
+
+ /* We seem to use serial console */
+ sprintf(command_line, "console=ttyS0,%s ",
+ getenv("baudrate"));
+ }
+ }
+
+ if (auto_boot) {
+ strcat(command_line, "auto ");
+ }
+
+ if (NULL != env_command_line) {
+ strcat(command_line, env_command_line);
+ }
+
+
+ printf("Kernel command line: \"%s\"\n", command_line);
+}
+
+void *load_zimage(char *image, unsigned long kernel_size,
+ unsigned long initrd_addr, unsigned long initrd_size,
+ int auto_boot)
+{
+ void *setup_base;
+ int setup_size;
+ int bootproto;
+ int big_image;
+ void *load_address;
+
+ struct setup_header *hdr = (struct setup_header *)(image + SETUP_SECTS_OFF);
+
+ setup_base = (void*)DEFAULT_SETUP_BASE; /* base address for real-mode segment */
+
+ if (KERNEL_MAGIC != hdr->boot_flag) {
+ printf("Error: Invalid Boot Flag (found 0x%04x, expected 0x%04x)\n",
+ hdr->boot_flag, KERNEL_MAGIC);
+ return 0;
+ } else {
+ printf("Valid Boot Flag\n");
+ }
+
+ /* determine boot protocol version */
+ if (KERNEL_V2_MAGIC == hdr->header) {
+ printf("Magic signature found\n");
+
+ bootproto = hdr->version;
+ } else {
+ /* Very old kernel */
+ printf("Magic signature not found\n");
+ bootproto = 0x0100;
+ }
+
+ /* determine size of setup */
+ if (0 == hdr->setup_sects) {
+ printf("Setup Sectors = 0 (defaulting to 4)\n");
+ setup_size = 5 * 512;
+ } else {
+ setup_size = (hdr->setup_sects + 1) * 512;
+ }
+
+ printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size);
+
+ if (setup_size > SETUP_MAX_SIZE) {
+ printf("Error: Setup is too large (%d bytes)\n", setup_size);
+ }
+
+ /* Determine image type */
+ big_image = (bootproto >= 0x0200) && (hdr->loadflags & BIG_KERNEL_FLAG);
+
+ /* Determine load address */
+ load_address = (void*)(big_image ? BZIMAGE_LOAD_ADDR : ZIMAGE_LOAD_ADDR);
+
+ /* load setup */
+ printf("Moving Real-Mode Code to 0x%8.8lx (%d bytes)\n", (ulong)setup_base, setup_size);
+ memmove(setup_base, image, setup_size);
+
+ printf("Using boot protocol version %x.%02x\n",
+ (bootproto & 0xff00) >> 8, bootproto & 0xff);
+
+ if (bootproto == 0x0100) {
+
+ *(u16*)(setup_base + CMD_LINE_MAGIC_OFF) = COMMAND_LINE_MAGIC;
+ *(u16*)(setup_base + CMD_LINE_OFFSET_OFF) = COMMAND_LINE_OFFSET;
+
+ /* A very old kernel MUST have its real-mode code
+ * loaded at 0x90000 */
+
+ if ((u32)setup_base != 0x90000) {
+ /* Copy the real-mode kernel */
+ memmove((void*)0x90000, setup_base, setup_size);
+ /* Copy the command line */
+ memmove((void*)0x99000, setup_base+COMMAND_LINE_OFFSET,
+ COMMAND_LINE_SIZE);
+
+ setup_base = (void*)0x90000; /* Relocated */
+ }
+
+ /* It is recommended to clear memory up to the 32K mark */
+ memset((void*)0x90000 + setup_size, 0, SETUP_MAX_SIZE-setup_size);
+ }
+
+ /* We are now setting up the real-mode version of the header */
+ hdr = (struct setup_header *)(setup_base + SETUP_SECTS_OFF);
+
+ if (bootproto >= 0x0200) {
+ hdr->type_of_loader = 8;
+
+ if (hdr->setup_sects >= 15)
+ printf("Linux kernel version %s\n", (char *)
+ (setup_base + (hdr->kernel_version + 0x200)));
+ else
+ printf("Setup Sectors < 15 - Cannot print kernel version.\n");
+
+ if (initrd_addr) {
+ printf("Initial RAM disk at linear address 0x%08lx, size %ld bytes\n",
+ initrd_addr, initrd_size);
+
+ hdr->ramdisk_image = initrd_addr;
+ hdr->ramdisk_size = initrd_size;
+ }
+ }
+
+ if (bootproto >= 0x0201) {
+ hdr->heap_end_ptr = HEAP_END_OFFSET;
+ hdr->loadflags |= HEAP_FLAG;
+ }
+
+ if (bootproto >= 0x0202) {
+ hdr->cmd_line_ptr = (u32)setup_base + COMMAND_LINE_OFFSET;
+ } else if (bootproto >= 0x0200) {
+
+ *(u16*)(setup_base + CMD_LINE_MAGIC_OFF) = COMMAND_LINE_MAGIC;
+ *(u16*)(setup_base + CMD_LINE_OFFSET_OFF) = COMMAND_LINE_OFFSET;
+
+ hdr->setup_move_size = 0x9100;
+ }
+
+ if (bootproto >= 0x0204)
+ kernel_size = hdr->syssize * 16;
+ else
+ kernel_size -= setup_size;
+
+
+ if (big_image) {
+ if ((kernel_size) > BZIMAGE_MAX_SIZE) {
+ printf("Error: bzImage kernel too big! (size: %ld, max: %d)\n",
+ kernel_size, BZIMAGE_MAX_SIZE);
+ return 0;
+ }
+
+ } else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
+ printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
+ kernel_size, ZIMAGE_MAX_SIZE);
+ return 0;
+ }
+
+ /* build command line at COMMAND_LINE_OFFSET */
+ build_command_line(setup_base + COMMAND_LINE_OFFSET, auto_boot);
+
+ printf("Loading %czImage at address 0x%08x (%ld bytes)\n", big_image ? 'b' : ' ',
+ (u32)load_address, kernel_size);
+
+
+ memmove(load_address, image + setup_size, kernel_size);
+
+ /* ready for booting */
+ return setup_base;
+}
+
+void boot_zimage(void *setup_base)
+{
+ struct pt_regs regs;
+
+ memset(&regs, 0, sizeof(struct pt_regs));
+ regs.xds = (u32)setup_base >> 4;
+ regs.xes = regs.xds;
+ regs.xss = regs.xds;
+ regs.esp = 0x9000;
+ regs.eflags = 0;
+ enter_realmode(((u32)setup_base+SETUP_START_OFFSET)>>4, 0, &regs, &regs);
+}
+
+int do_zboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ void *base_ptr;
+ void *bzImage_addr = NULL;
+ char *s;
+ ulong bzImage_size = 0;
+
+ disable_interrupts();
+
+ /* Setup board for maximum PC/AT Compatibility */
+ setup_pcat_compatibility();
+
+ if (argc >= 2)
+ /* argv[1] holds the address of the bzImage */
+ s = argv[1];
+ else
+ s = getenv("fileaddr");
+
+ if (s)
+ bzImage_addr = (void *)simple_strtoul(s, NULL, 16);
+
+ if (argc >= 3)
+ /* argv[2] holds the size of the bzImage */
+ bzImage_size = simple_strtoul(argv[2], NULL, 16);
+
+ /* Lets look for*/
+ base_ptr = load_zimage (bzImage_addr, bzImage_size, 0, 0, 0);
+
+ if (NULL == base_ptr) {
+ printf ("## Kernel loading failed ...\n");
+ } else {
+ printf ("## Transferring control to Linux (at address %08x) ...\n",
+ (u32)base_ptr);
+
+ /* we assume that the kernel is in place */
+ printf("\nStarting kernel ...\n\n");
+
+ boot_zimage(base_ptr);
+ /* does not return */
+ }
+
+ return -1;
+}
+
+U_BOOT_CMD(
+ zboot, 2, 0, do_zboot,
+ "Boot bzImage",
+ ""
+);