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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>
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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4
arch/powerpc/include/asm/ppc_asm.h
View File

@ -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,-KERNELBASE@h; \
0: addis rd,rs,-PAGE_OFFSET@h; \
.section ".vtop_fixup","aw"; \
.align 1; \
.long 0b; \
.previous
#define tovirt(rd,rs) \
0: addis rd,rs,KERNELBASE@h; \
0: addis rd,rs,PAGE_OFFSET@h; \
.section ".ptov_fixup","aw"; \
.align 1; \
.long 0b; \

11
arch/powerpc/kernel/head_32.S
View File

@ -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

2
arch/powerpc/mm/init_32.c
View File

@ -48,7 +48,7 @@
#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

4
arch/powerpc/mm/pgtable_32.c
View File

@ -269,7 +269,7 @@ int map_page(unsigned long va, phys_addr_t pa, int flags)
}
/*
* Map in a big chunk of physical memory starting at KERNELBASE.
* Map in a big chunk of physical memory starting at PAGE_OFFSET.
*/
void __init mapin_ram(void)
{
@ -278,7 +278,7 @@ 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);

8
arch/powerpc/mm/ppc_mmu_32.c
View File

@ -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;