diff options
Diffstat (limited to 'arch/ppc/boot/utils/mkbugboot.c')
| -rw-r--r-- | arch/ppc/boot/utils/mkbugboot.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/arch/ppc/boot/utils/mkbugboot.c b/arch/ppc/boot/utils/mkbugboot.c new file mode 100644 index 000000000000..886122283f39 --- /dev/null +++ b/arch/ppc/boot/utils/mkbugboot.c @@ -0,0 +1,187 @@ +/* + * arch/ppc/boot/utils/mkbugboot.c + * + * Makes a Motorola PPCBUG ROM bootable image which can be flashed + * into one of the FLASH banks on a Motorola PowerPlus board. + * + * Author: Matt Porter <mporter@mvista.com> + * + * 2001 (c) MontaVista, Software, Inc. This file is licensed under + * the terms of the GNU General Public License version 2. This program + * is licensed "as is" without any warranty of any kind, whether express + * or implied. + */ + +#define ELF_HEADER_SIZE 65536 + +#include <unistd.h> +#include <sys/stat.h> +#include <string.h> +#include <stdio.h> +#include <stdlib.h> +#include <errno.h> +#include <fcntl.h> +#ifdef __sun__ +#include <inttypes.h> +#else +#include <stdint.h> +#endif + +#ifdef __i386__ +#define cpu_to_be32(x) le32_to_cpu(x) +#define cpu_to_be16(x) le16_to_cpu(x) +#else +#define cpu_to_be32(x) (x) +#define cpu_to_be16(x) (x) +#endif + +#define cpu_to_le32(x) le32_to_cpu((x)) +unsigned long le32_to_cpu(unsigned long x) +{ + return (((x & 0x000000ffU) << 24) | + ((x & 0x0000ff00U) << 8) | + ((x & 0x00ff0000U) >> 8) | + ((x & 0xff000000U) >> 24)); +} + +#define cpu_to_le16(x) le16_to_cpu((x)) +unsigned short le16_to_cpu(unsigned short x) +{ + return (((x & 0x00ff) << 8) | + ((x & 0xff00) >> 8)); +} + +/* size of read buffer */ +#define SIZE 0x1000 + +/* PPCBUG ROM boot header */ +typedef struct bug_boot_header { + uint8_t magic_word[4]; /* "BOOT" */ + uint32_t entry_offset; /* Offset from top of header to code */ + uint32_t routine_length; /* Length of code */ + uint8_t routine_name[8]; /* Name of the boot code */ +} bug_boot_header_t; + +#define HEADER_SIZE sizeof(bug_boot_header_t) + +uint32_t copy_image(int32_t in_fd, int32_t out_fd) +{ + uint8_t buf[SIZE]; + int n; + uint32_t image_size = 0; + uint8_t zero = 0; + + lseek(in_fd, ELF_HEADER_SIZE, SEEK_SET); + + /* Copy an image while recording its size */ + while ( (n = read(in_fd, buf, SIZE)) > 0 ) + { + image_size = image_size + n; + write(out_fd, buf, n); + } + + /* BUG romboot requires that our size is divisible by 2 */ + /* align image to 2 byte boundary */ + if (image_size % 2) + { + image_size++; + write(out_fd, &zero, 1); + } + + return image_size; +} + +void write_bugboot_header(int32_t out_fd, uint32_t boot_size) +{ + uint8_t header_block[HEADER_SIZE]; + bug_boot_header_t *bbh = (bug_boot_header_t *)&header_block[0]; + + memset(header_block, 0, HEADER_SIZE); + + /* Fill in the PPCBUG ROM boot header */ + strncpy(bbh->magic_word, "BOOT", 4); /* PPCBUG magic word */ + bbh->entry_offset = cpu_to_be32(HEADER_SIZE); /* Entry address */ + bbh->routine_length= cpu_to_be32(HEADER_SIZE+boot_size+2); /* Routine length */ + strncpy(bbh->routine_name, "LINUXROM", 8); /* Routine name */ + + /* Output the header and bootloader to the file */ + write(out_fd, header_block, HEADER_SIZE); +} + +uint16_t calc_checksum(int32_t bug_fd) +{ + uint32_t checksum_var = 0; + uint8_t buf[2]; + int n; + + /* Checksum loop */ + while ( (n = read(bug_fd, buf, 2) ) ) + { + checksum_var = checksum_var + *(uint16_t *)buf; + + /* If we carry out, mask it and add one to the checksum */ + if (checksum_var >> 16) + checksum_var = (checksum_var & 0x0000ffff) + 1; + } + + return checksum_var; +} + +int main(int argc, char *argv[]) +{ + int32_t image_fd, bugboot_fd; + int argptr = 1; + uint32_t kernel_size = 0; + uint16_t checksum = 0; + uint8_t bugbootname[256]; + + if ( (argc != 3) ) + { + fprintf(stderr, "usage: %s <kernel_image> <bugboot>\n",argv[0]); + exit(-1); + } + + /* Get file args */ + + /* kernel image file */ + if ((image_fd = open( argv[argptr] , 0)) < 0) + exit(-1); + argptr++; + + /* bugboot file */ + if ( !strcmp( argv[argptr], "-" ) ) + bugboot_fd = 1; /* stdout */ + else + if ((bugboot_fd = creat( argv[argptr] , 0755)) < 0) + exit(-1); + else + strcpy(bugbootname, argv[argptr]); + argptr++; + + /* Set file position after ROM header block where zImage will be written */ + lseek(bugboot_fd, HEADER_SIZE, SEEK_SET); + + /* Copy kernel image into bugboot image */ + kernel_size = copy_image(image_fd, bugboot_fd); + close(image_fd); + + /* Set file position to beginning where header/romboot will be written */ + lseek(bugboot_fd, 0, SEEK_SET); + + /* Write out BUG header/romboot */ + write_bugboot_header(bugboot_fd, kernel_size); + + /* Close bugboot file */ + close(bugboot_fd); + + /* Reopen it as read/write */ + bugboot_fd = open(bugbootname, O_RDWR); + + /* Calculate checksum */ + checksum = calc_checksum(bugboot_fd); + + /* Write out the calculated checksum */ + write(bugboot_fd, &checksum, 2); + + return 0; +} |