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armv7: dynamically calculate the branch offset in cbfstool 

This tidies up the ARMV7 case when creating cbfs:
- Calculate the offset using the size of the master header and offsets
  rather than using a magic constant.
- Re-order some assignments so things happen in a logical order.

Change-Id: Id9cdbc3389c8bb504fa99436c9771936cc4c1c23
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/2125
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
David Hendricks 2013-01-09 17:45:19 -08:00 committed by Ronald G. Minnich
parent 8bc10b74dc
commit 9ad1f56951
1 changed files with 8 additions and 7 deletions
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15
util/cbfstool/common.c
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@ -565,22 +565,23 @@ int create_cbfs_image(const char *romfile, uint32_t _romsize,
/* Set up physical/virtual mapping */
offset = romarea;
// should be aligned to align but then we need to dynamically
// create the jump to the bootblock
loadfile(bootblock, &bootblocksize, romarea + offs + 0x20 +
sizeof(struct cbfs_header), SEEK_SET);
master_header = (struct cbfs_header *)(romarea + offs + 0x20);
// should be aligned to align
uint32_t *arm_vec = (uint32_t *)(romarea + offs);
master_header = (struct cbfs_header *)(romarea + offs + 0x20);
loadfile(bootblock, &bootblocksize, romarea + offs + 0x20 +
sizeof(struct cbfs_header), SEEK_SET);
/*
* Encoding for this branch instruction is:
* 31:28 - condition (0xe for always/unconditional)
* 27:24 - 0xa
* 27:24 - Branch (0xa, encoding A1)
* 23: 0 - sign-extended offset (in multiples of 4)
*
* When executing the branch, the PC will read as the address
* of current instruction + 8.
*/
arm_vec[0] = htonl(0x0e0000ea); // branch to . + 64 bytes
uint32_t imm = ((0x20 + sizeof(struct cbfs_header)) - 8) / 4;
arm_vec[0] = imm | (0xa << 24) | (0xe << 28);
master_header->magic = ntohl(CBFS_HEADER_MAGIC);
master_header->version = ntohl(CBFS_HEADER_VERSION);