diff options
| author | Dale Farnsworth <dale@farnsworth.org> | 2008-12-17 10:09:13 +0000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-12-23 15:13:29 +1100 |
| commit | ccdcef72c249c289898b164eada89a61855b9287 (patch) | |
| tree | 4a60305aaaa89949b2f979226cc192d8d5a3eb2c /arch/powerpc/kernel/head_32.S | |
| parent | 01695a9687e5a8d78589605037cc7828a5b67ac9 (diff) | |
| download | blackbird-op-linux-ccdcef72c249c289898b164eada89a61855b9287.tar.gz blackbird-op-linux-ccdcef72c249c289898b164eada89a61855b9287.zip | |
powerpc/32: Add the ability for a classic ppc kernel to be loaded at 32M
Add the ability for a classic ppc kernel to be loaded at an address
of 32MB. This done by fixing a few places that assume we are loaded
at address 0, and by changing several uses of KERNELBASE to use
PAGE_OFFSET, instead.
Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/head_32.S')
| -rw-r--r-- | arch/powerpc/kernel/head_32.S | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S index 266061924654..a1c4cfd25ded 100644 --- a/arch/powerpc/kernel/head_32.S +++ b/arch/powerpc/kernel/head_32.S @@ -183,7 +183,8 @@ __after_mmu_off: bl reloc_offset mr r26,r3 addis r4,r3,KERNELBASE@h /* current address of _start */ - cmpwi 0,r4,0 /* are we already running at 0? */ + lis r5,PHYSICAL_START@h + cmplw 0,r4,r5 /* already running at PHYSICAL_START? */ bne relocate_kernel /* * we now have the 1st 16M of ram mapped with the bats. @@ -811,13 +812,13 @@ giveup_altivec: /* * This code is jumped to from the startup code to copy - * the kernel image to physical address 0. + * the kernel image to physical address PHYSICAL_START. */ relocate_kernel: addis r9,r26,klimit@ha /* fetch klimit */ lwz r25,klimit@l(r9) addis r25,r25,-KERNELBASE@h - li r3,0 /* Destination base address */ + lis r3,PHYSICAL_START@h /* Destination base address */ li r6,0 /* Destination offset */ li r5,0x4000 /* # bytes of memory to copy */ bl copy_and_flush /* copy the first 0x4000 bytes */ @@ -1188,11 +1189,11 @@ mmu_off: /* * Use the first pair of BAT registers to map the 1st 16MB - * of RAM to KERNELBASE. From this point on we can't safely + * of RAM to PAGE_OFFSET. From this point on we can't safely * call OF any more. */ initial_bats: - lis r11,KERNELBASE@h + lis r11,PAGE_OFFSET@h mfspr r9,SPRN_PVR rlwinm r9,r9,16,16,31 /* r9 = 1 for 601, 4 for 604 */ cmpwi 0,r9,1 |
