c32527a140
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Paul Mackerras <paulus@samba.org>
147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
/*
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* Makes a Motorola PPCBUG ROM bootable image which can be flashed
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* into one of the FLASH banks on a Motorola PowerPlus board.
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*
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* Author: Matt Porter <mporter@mvista.com>
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*
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* 2001 (c) MontaVista, Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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#define ELF_HEADER_SIZE 65536
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#include <unistd.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netinet/in.h>
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#ifdef __sun__
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#include <inttypes.h>
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#else
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#include <stdint.h>
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#endif
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/* size of read buffer */
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#define SIZE 0x1000
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/* PPCBUG ROM boot header */
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typedef struct bug_boot_header {
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uint8_t magic_word[4]; /* "BOOT" */
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uint32_t entry_offset; /* Offset from top of header to code */
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uint32_t routine_length; /* Length of code */
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uint8_t routine_name[8]; /* Name of the boot code */
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} bug_boot_header_t;
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#define HEADER_SIZE sizeof(bug_boot_header_t)
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void update_checksum(void *buf, size_t size, uint16_t *sum)
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{
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uint32_t csum = *sum;
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while (size) {
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csum += *(uint16_t *)buf;
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if (csum > 0xffff)
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csum -= 0xffff;
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buf = (uint16_t *)buf + 1;
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size -= 2;
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}
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*sum = csum;
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}
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uint32_t copy_image(int in_fd, int out_fd, uint16_t *sum)
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{
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uint8_t buf[SIZE];
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int offset = 0;
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int n;
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uint32_t image_size = 0;
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lseek(in_fd, ELF_HEADER_SIZE, SEEK_SET);
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/* Copy an image while recording its size */
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while ( (n = read(in_fd, buf + offset, SIZE - offset)) > 0 ) {
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n += offset;
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offset = n & 1;
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n -= offset;
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image_size = image_size + n;
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/* who's going to deal with short writes? */
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write(out_fd, buf, n);
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update_checksum(buf, n, sum);
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if (offset)
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buf[0] = buf[n];
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}
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/* BUG romboot requires that our size is divisible by 2 */
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/* align image to 2 byte boundary */
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if (offset) {
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image_size += 2;
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buf[1] = '\0';
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write(out_fd, buf, 2);
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update_checksum(buf, 2, sum);
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}
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return image_size;
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}
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void write_bugboot_header(int out_fd, uint32_t boot_size, uint16_t *sum)
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{
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static bug_boot_header_t bbh = {
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.magic_word = "BOOT",
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.routine_name = "LINUXROM"
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};
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/* Fill in the PPCBUG ROM boot header */
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bbh.entry_offset = htonl(HEADER_SIZE); /* Entry address */
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bbh.routine_length= htonl(HEADER_SIZE+boot_size+2); /* Routine length */
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/* Output the header and bootloader to the file */
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write(out_fd, &bbh, sizeof(bug_boot_header_t));
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update_checksum(&bbh, sizeof(bug_boot_header_t), sum);
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}
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int main(int argc, char *argv[])
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{
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int image_fd, bugboot_fd;
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uint32_t kernel_size = 0;
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uint16_t checksum = 0;
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if (argc != 3) {
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fprintf(stderr, "usage: %s <kernel_image> <bugboot>\n",argv[0]);
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exit(-1);
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}
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/* Get file args */
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/* kernel image file */
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if ((image_fd = open(argv[1] , 0)) < 0)
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exit(-1);
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/* bugboot file */
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if (!strcmp(argv[2], "-"))
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bugboot_fd = 1; /* stdout */
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else if ((bugboot_fd = creat(argv[2] , 0755)) < 0)
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exit(-1);
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/* Set file position after ROM header block where zImage will be written */
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lseek(bugboot_fd, HEADER_SIZE, SEEK_SET);
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/* Copy kernel image into bugboot image */
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kernel_size = copy_image(image_fd, bugboot_fd, &checksum);
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/* Set file position to beginning where header/romboot will be written */
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lseek(bugboot_fd, 0, SEEK_SET);
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/* Write out BUG header/romboot */
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write_bugboot_header(bugboot_fd, kernel_size, &checksum);
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/* Write out the calculated checksum */
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lseek(bugboot_fd, 0, SEEK_END);
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write(bugboot_fd, &checksum, 2);
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/* Close bugboot file */
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close(bugboot_fd);
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return 0;
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}
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