From: Dale Farnsworth <[EMAIL PROTECTED]>
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 <[EMAIL PROTECTED]>
Signed-off-by: Anton Vorontsov <[EMAIL PROTECTED]>
---
arch/powerpc/kernel/head_32.S | 11 ++++++-----
arch/powerpc/mm/init_32.c | 2 +-
arch/powerpc/mm/pgtable_32.c | 4 ++--
arch/powerpc/mm/ppc_mmu_32.c | 8 ++++----
include/asm-powerpc/ppc_asm.h | 4 ++--
5 files changed, 15 insertions(+), 14 deletions(-)
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index 99ee2f0..45e612b 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -176,7 +176,8 @@ __after_mmu_off:
bl reloc_offset
mr r26,r3
addis r4,r3,[EMAIL PROTECTED] /* current address of _start */
- cmpwi 0,r4,0 /* are we already running at 0? */
+ lis r5,[EMAIL PROTECTED]
+ cmplw 0,r4,r5 /* already running at PHYSICAL_START? */
bne relocate_kernel
/*
* we now have the 1st 16M of ram mapped with the bats.
@@ -804,13 +805,13 @@ 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,[EMAIL PROTECTED] /* fetch klimit */
lwz r25,[EMAIL PROTECTED](r9)
addis r25,r25,[EMAIL PROTECTED]
- li r3,0 /* Destination base address */
+ lis r3,[EMAIL PROTECTED] /* 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 */
@@ -1172,11 +1173,11 @@ 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,[EMAIL PROTECTED]
+ lis r11,[EMAIL PROTECTED]
mfspr r9,SPRN_PVR
rlwinm r9,r9,16,16,31 /* r9 = 1 for 601, 4 for 604 */
cmpwi 0,r9,1
diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index 388ceda..4ac0e4e 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -49,7 +49,7 @@
#if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
/* The ammount of lowmem must be within 0xF0000000 - KERNELBASE. */
-#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - KERNELBASE))
+#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET))
#error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL"
#endif
#endif
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 2001abd..ea50968 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -288,7 +288,7 @@ int map_page(unsigned long va, phys_addr_t pa, int flags)
}
/*
- * Map in all of physical memory starting at KERNELBASE.
+ * Map in all of physical memory starting at PAGE_OFFSET.
*/
void __init mapin_ram(void)
{
@@ -297,7 +297,7 @@ void __init mapin_ram(void)
int ktext;
s = mmu_mapin_ram();
- v = KERNELBASE + s;
+ v = PAGE_OFFSET + s;
p = memstart_addr + s;
for (; s < total_lowmem; s += PAGE_SIZE) {
ktext = ((char *) v >= _stext && (char *) v < etext);
diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c
index c53145f..7c86103 100644
--- a/arch/powerpc/mm/ppc_mmu_32.c
+++ b/arch/powerpc/mm/ppc_mmu_32.c
@@ -95,16 +95,16 @@ unsigned long __init mmu_mapin_ram(void)
break;
}
- setbat(2, KERNELBASE, 0, bl, _PAGE_RAM);
- done = (unsigned long)bat_addrs[2].limit - KERNELBASE + 1;
+ setbat(2, PAGE_OFFSET, 0, bl, _PAGE_RAM);
+ done = (unsigned long)bat_addrs[2].limit - PAGE_OFFSET + 1;
if ((done < tot) && !bat_addrs[3].limit) {
/* use BAT3 to cover a bit more */
tot -= done;
for (bl = 128<<10; bl < max_size; bl <<= 1)
if (bl * 2 > tot)
break;
- setbat(3, KERNELBASE+done, done, bl, _PAGE_RAM);
- done = (unsigned long)bat_addrs[3].limit - KERNELBASE + 1;
+ setbat(3, PAGE_OFFSET+done, done, bl, _PAGE_RAM);
+ done = (unsigned long)bat_addrs[3].limit - PAGE_OFFSET + 1;
}
return done;
diff --git a/include/asm-powerpc/ppc_asm.h b/include/asm-powerpc/ppc_asm.h
index 0966899..d0c7f33 100644
--- a/include/asm-powerpc/ppc_asm.h
+++ b/include/asm-powerpc/ppc_asm.h
@@ -425,14 +425,14 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
#define fromreal(rd) tovirt(rd,rd)
#define tophys(rd,rs) \
-0: addis rd,rs,[EMAIL PROTECTED]; \
+0: addis rd,rs,[EMAIL PROTECTED]; \
.section ".vtop_fixup","aw"; \
.align 1; \
.long 0b; \
.previous
#define tovirt(rd,rs) \
-0: addis rd,rs,[EMAIL PROTECTED]; \
+0: addis rd,rs,[EMAIL PROTECTED]; \
.section ".ptov_fixup","aw"; \
.align 1; \
.long 0b; \
--
1.5.5.4
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