[POWERPC] Remove and replace uses of PPC_MEMSTART with memstart_addr

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>

1 files changed, 2 insertions, 9 deletions

diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c
index 72de3c79210..65f915cbd29 100644
--- a/arch/powerpc/mm/ppc_mmu_32.c
+++ b/arch/powerpc/mm/ppc_mmu_32.c
@@ -82,7 +82,6 @@ unsigned long __init mmu_mapin_ram(void)
 #else
 	unsigned long tot, bl, done;
 	unsigned long max_size = (256<<20);
-	unsigned long align;
 
 	if (__map_without_bats) {
 		printk(KERN_DEBUG "RAM mapped without BATs\n");
@@ -93,19 +92,13 @@ unsigned long __init mmu_mapin_ram(void)
 
 	/* Make sure we don't map a block larger than the
 	   smallest alignment of the physical address. */
-	/* alignment of PPC_MEMSTART */
-	align = ~(PPC_MEMSTART-1) & PPC_MEMSTART;
-	/* set BAT block size to MIN(max_size, align) */
-	if (align && align < max_size)
-		max_size = align;
-
 	tot = total_lowmem;
 	for (bl = 128<<10; bl < max_size; bl <<= 1) {
 		if (bl * 2 > tot)
 			break;
 	}
 
-	setbat(2, KERNELBASE, PPC_MEMSTART, bl, _PAGE_RAM);
+	setbat(2, KERNELBASE, 0, bl, _PAGE_RAM);
 	done = (unsigned long)bat_addrs[2].limit - KERNELBASE + 1;
 	if ((done < tot) && !bat_addrs[3].limit) {
 		/* use BAT3 to cover a bit more */
@@ -113,7 +106,7 @@ unsigned long __init mmu_mapin_ram(void)
 		for (bl = 128<<10; bl < max_size; bl <<= 1)
 			if (bl * 2 > tot)
 				break;
-		setbat(3, KERNELBASE+done, PPC_MEMSTART+done, bl, _PAGE_RAM);
+		setbat(3, KERNELBASE+done, done, bl, _PAGE_RAM);
 		done = (unsigned long)bat_addrs[3].limit - KERNELBASE + 1;
 	}