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x86: Rework relocation calculations

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This commit introduces no functional changes - It simply re-arranges the
calculations so that adding to them in future commits will be cleaner

--
Changes for v2:
 - Fixed typo in title
 - Added commit message
This commit is contained in:
Graeme Russ 2012-01-01 15:57:02 +11:00
parent f48dd6fc6c
commit 240ab5aa21
1 changed files with 12 additions and 13 deletions
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25
arch/x86/lib/board.c
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@ -164,24 +164,23 @@ static int calculate_relocation_address(void)
ulong text_start = (ulong)&__text_start;
ulong bss_end = (ulong)&__bss_end;
ulong dest_addr;
ulong rel_offset;
/* Calculate destination RAM Address and relocation offset */
dest_addr = gd->ram_size;
dest_addr -= CONFIG_SYS_STACK_SIZE;
dest_addr -= (bss_end - text_start);
/*
* Round destination address down to 16-byte boundary to keep
* IDT and GDT 16-byte aligned
* NOTE: All destination address are rounded down to 16-byte
* boundary to satisfy various worst-case alignment
* requirements
*/
/* Stack is at top of available memory */
dest_addr = gd->ram_size;
gd->start_addr_sp = dest_addr;
/* U-Boot is below the stack */
dest_addr -= CONFIG_SYS_STACK_SIZE;
dest_addr -= (bss_end - text_start);
dest_addr &= ~15;
rel_offset = dest_addr - text_start;
gd->start_addr_sp = gd->ram_size;
gd->relocaddr = dest_addr;
gd->reloc_off = rel_offset;
gd->reloc_off = (dest_addr - text_start);
return 0;
}