u-boot/arch/i386/lib/zimage.c
Graeme Russ abe98f49e1 x86: zboot update
The header of recent Linux Kernels includes the size of the image, and
therefore is not needed to be passed to zboot. Still process the third
parameter (size of image) in the event that an older kernel is being loaded
2010-10-07 20:03:19 +11:00

296 lines
7.4 KiB
C

/*
* (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 i386 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",
""
);