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Clean up and comments.

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This commit is contained in:
Vincent Rivière
2012-11-12 15:41:09 +00:00
parent 0404bf0721
commit 75a92fa9e0
1 changed files with 20 additions and 6 deletions
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26
sources/startcf.S
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@@ -1,19 +1,33 @@
/* This object file must be the first to be linked,
* so it will be placed at the very beginning of the ROM.
*/
.equ MCF_MMU_MMUCR, __MMUBAR + 0 .equ MCF_MMU_MMUCR, __MMUBAR + 0
.global _startup
.global _rom_header
.global _rom_entry
.extern _initialize_hardware .extern _initialize_hardware
.extern _rt_mbar .extern _rt_mbar
_startup: /* ROM header */
bra.s warmstart _rom_header:
jmp ___BOOT_FLASH + 8 /* that's also our reset vector */ /* The first long is supposed to be the initial SP.
* We replace it by bra.s to allow running the ROM from the first byte.
* Then we add a fake jmp instruction for pretty disassembly.
*/
bra.s _rom_entry // Short jump to the real entry point
.short 0x4ef9 // Fake jmp instruction
/* The second long is the initial PC */
.long _rom_entry // Real entry point
/* ROM entry point */
_rom_entry:
/* disable interrupts */ /* disable interrupts */
warmstart:
move.w #0x2700,SR move.w #0x2700,SR
/* Initialize MBAR */ /* Initialize MBAR */
move.l #__MBAR,d0 move.l #__MBAR,d0
movec d0,MBAR movec d0,MBAR
move.l d0,_rt_mbar move.l d0,_rt_mbar