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powerpc/32: Add the ability for a classic ppc kernel to be loaded at 32M

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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>
This commit is contained in:
Dale Farnsworth
2008-12-17 10:09:13 +00:00
committed by Paul Mackerras
parent 01695a9687
commit ccdcef72c2
5 changed files with 15 additions and 14 deletions
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11
arch/powerpc/kernel/head_32.S
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@@ -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