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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ppc/boot/utils/mkbugboot.c
downloadlinux-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
linux-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/ppc/boot/utils/mkbugboot.c')
-rw-r--r--arch/ppc/boot/utils/mkbugboot.c187
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;
+}