| Grant Likely | d2477b5 | 2008-03-19 04:07:43 +1100 | [diff] [blame] | 1 | #include "ppc_asm.h" |
| 2 | |
| 3 | .text |
| 4 | .global _zimage_start |
| 5 | _zimage_start: |
| 6 | |
| 7 | /* PPC errata 213: needed by Virtex-4 FX */ |
| 8 | mfccr0 0 |
| 9 | oris 0,0,0x50000000@h |
| 10 | mtccr0 0 |
| 11 | |
| 12 | /* |
| 13 | * Invalidate the data cache if the data cache is turned off. |
| 14 | * - The 405 core does not invalidate the data cache on power-up |
| 15 | * or reset but does turn off the data cache. We cannot assume |
| 16 | * that the cache contents are valid. |
| 17 | * - If the data cache is turned on this must have been done by |
| 18 | * a bootloader and we assume that the cache contents are |
| 19 | * valid. |
| 20 | */ |
| 21 | mfdccr r9 |
| 22 | cmplwi r9,0 |
| 23 | bne 2f |
| 24 | lis r9,0 |
| 25 | li r8,256 |
| 26 | mtctr r8 |
| 27 | 1: dccci r0,r9 |
| 28 | addi r9,r9,0x20 |
| 29 | bdnz 1b |
| 30 | 2: b _zimage_start_lib |