diff options
Diffstat (limited to 'arch/ppc/boot/utils/mkbugboot.c')
| -rw-r--r-- | arch/ppc/boot/utils/mkbugboot.c | 208 |
1 files changed, 85 insertions, 123 deletions
diff --git a/arch/ppc/boot/utils/mkbugboot.c b/arch/ppc/boot/utils/mkbugboot.c index 29115e01f60a..1640c4199ca6 100644 --- a/arch/ppc/boot/utils/mkbugboot.c +++ b/arch/ppc/boot/utils/mkbugboot.c @@ -19,36 +19,13 @@ #include <stdlib.h> #include <errno.h> #include <fcntl.h> +#include <netinet/in.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 @@ -62,124 +39,109 @@ typedef struct bug_boot_header { #define HEADER_SIZE sizeof(bug_boot_header_t) -uint32_t copy_image(int32_t in_fd, int32_t out_fd) +void update_checksum(void *buf, size_t size, uint16_t *sum) { - 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; + uint32_t csum = *sum; + + while (size) { + csum += *(uint16_t *)buf; + if (csum > 0xffff) + csum -= 0xffff; + buf = (uint16_t *)buf + 1; + size -= 2; + } + *sum = csum; } -void write_bugboot_header(int32_t out_fd, uint32_t boot_size) +uint32_t copy_image(int in_fd, int out_fd, uint16_t *sum) { - 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); + uint8_t buf[SIZE]; + int offset = 0; + int n; + uint32_t image_size = 0; + + lseek(in_fd, ELF_HEADER_SIZE, SEEK_SET); + + /* Copy an image while recording its size */ + while ( (n = read(in_fd, buf + offset, SIZE - offset)) > 0 ) { + n += offset; + offset = n & 1; + n -= offset; + image_size = image_size + n; + /* who's going to deal with short writes? */ + write(out_fd, buf, n); + update_checksum(buf, n, sum); + if (offset) + buf[0] = buf[n]; + } + + /* BUG romboot requires that our size is divisible by 2 */ + /* align image to 2 byte boundary */ + if (offset) { + image_size += 2; + buf[1] = '\0'; + write(out_fd, buf, 2); + update_checksum(buf, 2, sum); + } + return image_size; } -uint16_t calc_checksum(int32_t bug_fd) +void write_bugboot_header(int out_fd, uint32_t boot_size, uint16_t *sum) { - 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; + static bug_boot_header_t bbh = { + .magic_word = "BOOT", + .routine_name = "LINUXROM" + }; + + /* Fill in the PPCBUG ROM boot header */ + bbh.entry_offset = htonl(HEADER_SIZE); /* Entry address */ + bbh.routine_length= htonl(HEADER_SIZE+boot_size+2); /* Routine length */ + + /* Output the header and bootloader to the file */ + write(out_fd, &bbh, sizeof(bug_boot_header_t)); + update_checksum(&bbh, sizeof(bug_boot_header_t), sum); } 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++; + int image_fd, bugboot_fd; + uint32_t kernel_size = 0; + uint16_t checksum = 0; - /* 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++; + if (argc != 3) { + fprintf(stderr, "usage: %s <kernel_image> <bugboot>\n",argv[0]); + exit(-1); + } - /* Set file position after ROM header block where zImage will be written */ - lseek(bugboot_fd, HEADER_SIZE, SEEK_SET); + /* Get file args */ - /* Copy kernel image into bugboot image */ - kernel_size = copy_image(image_fd, bugboot_fd); - close(image_fd); + /* kernel image file */ + if ((image_fd = open(argv[1] , 0)) < 0) + exit(-1); - /* Set file position to beginning where header/romboot will be written */ - lseek(bugboot_fd, 0, SEEK_SET); + /* bugboot file */ + if (!strcmp(argv[2], "-")) + bugboot_fd = 1; /* stdout */ + else if ((bugboot_fd = creat(argv[2] , 0755)) < 0) + exit(-1); - /* Write out BUG header/romboot */ - write_bugboot_header(bugboot_fd, kernel_size); + /* Set file position after ROM header block where zImage will be written */ + lseek(bugboot_fd, HEADER_SIZE, SEEK_SET); - /* Close bugboot file */ - close(bugboot_fd); + /* Copy kernel image into bugboot image */ + kernel_size = copy_image(image_fd, bugboot_fd, &checksum); - /* Reopen it as read/write */ - bugboot_fd = open(bugbootname, O_RDWR); + /* Set file position to beginning where header/romboot will be written */ + lseek(bugboot_fd, 0, SEEK_SET); - /* Calculate checksum */ - checksum = calc_checksum(bugboot_fd); + /* Write out BUG header/romboot */ + write_bugboot_header(bugboot_fd, kernel_size, &checksum); - /* Write out the calculated checksum */ - write(bugboot_fd, &checksum, 2); + /* Write out the calculated checksum */ + lseek(bugboot_fd, 0, SEEK_END); + write(bugboot_fd, &checksum, 2); - return 0; + /* Close bugboot file */ + close(bugboot_fd); + return 0; } |
