powerpc/mm: Tweak PTE bit combination definitions

This patch tweaks the way some PTE bit combinations are defined, in such a
way that the 32 and 64-bit variant become almost identical and that will
make it easier to bring in a new common pte-* file for the new variant
of the Book3-E support.

The combination of bits defining access to kernel pages are now clearly
separated from the combination used by userspace and the core VM. The
resulting generated code should remain identical unless I made a mistake.

Note: While at it, I removed a non-sensical statement related to CONFIG_KGDB
in ppc_mmu_32.c which could cause kernel mappings to be user accessible when
that option is enabled. Probably something that bitrot.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

3 files changed, 5 insertions, 11 deletions

diff --git a/arch/powerpc/mm/fsl_booke_mmu.c b/arch/powerpc/mm/fsl_booke_mmu.c
index 985b6c361ab4..bb3d65998e6b 100644
--- a/arch/powerpc/mm/fsl_booke_mmu.c
+++ b/arch/powerpc/mm/fsl_booke_mmu.c
@@ -162,7 +162,7 @@ unsigned long __init mmu_mapin_ram(void)
 	phys_addr_t phys = memstart_addr;
 
 	while (cam[tlbcam_index] && tlbcam_index < ARRAY_SIZE(cam)) {
-		settlbcam(tlbcam_index, virt, phys, cam[tlbcam_index], _PAGE_KERNEL, 0);
+		settlbcam(tlbcam_index, virt, phys, cam[tlbcam_index], PAGE_KERNEL_X, 0);
 		virt += cam[tlbcam_index];
 		phys += cam[tlbcam_index];
 		tlbcam_index++;
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 0f8c4371dfab..430d0908fa50 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -164,7 +164,7 @@ __ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
 
 	/* Make sure we have the base flags */
 	if ((flags & _PAGE_PRESENT) == 0)
-		flags |= _PAGE_KERNEL;
+		flags |= PAGE_KERNEL;
 
 	/* Non-cacheable page cannot be coherent */
 	if (flags & _PAGE_NO_CACHE)
@@ -296,7 +296,7 @@ void __init mapin_ram(void)
 	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;
+		f = ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL;
 		map_page(v, p, f);
 #ifdef CONFIG_PPC_STD_MMU_32
 		if (ktext)
diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c
index fe65c405412c..2d2a87e10154 100644
--- a/arch/powerpc/mm/ppc_mmu_32.c
+++ b/arch/powerpc/mm/ppc_mmu_32.c
@@ -74,9 +74,6 @@ unsigned long p_mapped_by_bats(phys_addr_t pa)
 
 unsigned long __init mmu_mapin_ram(void)
 {
-#ifdef CONFIG_POWER4
-	return 0;
-#else
 	unsigned long tot, bl, done;
 	unsigned long max_size = (256<<20);
 
@@ -95,7 +92,7 @@ unsigned long __init mmu_mapin_ram(void)
 			break;
 	}
 
-	setbat(2, PAGE_OFFSET, 0, bl, _PAGE_RAM);
+	setbat(2, PAGE_OFFSET, 0, bl, PAGE_KERNEL_X);
 	done = (unsigned long)bat_addrs[2].limit - PAGE_OFFSET + 1;
 	if ((done < tot) && !bat_addrs[3].limit) {
 		/* use BAT3 to cover a bit more */
@@ -103,12 +100,11 @@ unsigned long __init mmu_mapin_ram(void)
 		for (bl = 128<<10; bl < max_size; bl <<= 1)
 			if (bl * 2 > tot)
 				break;
-		setbat(3, PAGE_OFFSET+done, done, bl, _PAGE_RAM);
+		setbat(3, PAGE_OFFSET+done, done, bl, PAGE_KERNEL_X);
 		done = (unsigned long)bat_addrs[3].limit - PAGE_OFFSET + 1;
 	}
 
 	return done;
-#endif
 }
 
 /*
@@ -136,9 +132,7 @@ void __init setbat(int index, unsigned long virt, phys_addr_t phys,
 		wimgxpp |= (flags & _PAGE_RW)? BPP_RW: BPP_RX;
 		bat[1].batu = virt | (bl << 2) | 2; /* Vs=1, Vp=0 */
 		bat[1].batl = BAT_PHYS_ADDR(phys) | wimgxpp;
-#ifndef CONFIG_KGDB /* want user access for breakpoints */
 		if (flags & _PAGE_USER)
-#endif
 			bat[1].batu |= 1; 	/* Vp = 1 */
 		if (flags & _PAGE_GUARDED) {
 			/* G bit must be zero in IBATs */