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[POWERPC] Remove and replace uses of PPC_MEMSTART with memstart_addr

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A number of users of PPC_MEMSTART (40x, ppc_mmu_32) can just always
use 0 as we don't support booting these kernels at non-zero physical
addresses since their exception vectors must be at 0 (or 0xfffx_xxxx).

For the sub-arches that support relocatable interrupt vectors
(book-e), it's reasonable to have memory start at a non-zero physical
address.  For those cases use the variable memstart_addr instead of
the #define PPC_MEMSTART since the only uses of PPC_MEMSTART are for
initialization and in the future we can set memstart_addr at runtime
to have a relocatable kernel.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Kumar Gala
2008-04-16 05:52:21 +10:00
committed by Paul Mackerras
parent 1993cbf4ae
commit 99c62dd773
7 changed files with 15 additions and 24 deletions
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5
arch/powerpc/mm/pgtable_32.c
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@@ -281,12 +281,13 @@ int map_page(unsigned long va, phys_addr_t pa, int flags)
*/
void __init mapin_ram(void)
{
unsigned long v, p, s, f;
unsigned long v, s, f;
phys_addr_t p;
int ktext;
s = mmu_mapin_ram();
v = KERNELBASE + s;
p = PPC_MEMSTART + s;
p = memstart_addr + s;
for (; s < total_lowmem; s += PAGE_SIZE) {
ktext = ((char *) v >= _stext && (char *) v < etext);
f = ktext ?_PAGE_RAM_TEXT : _PAGE_RAM;