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authorMichael Ellerman <michael@ellerman.id.au>2005-12-05 10:24:33 -0600
committerPaul Mackerras <paulus@samba.org>2006-01-09 14:51:54 +1100
commitb5666f70395016a55cc9d57826508b8a346398d0 (patch)
tree39d74718c2bc3f2fcba6456fdc39a6a0de3d78bd /arch/powerpc/kernel
parent51fae6de24da57bc6cdaa1b253595c3513ecbf2d (diff)
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[PATCH] powerpc: Separate usage of KERNELBASE and PAGE_OFFSET
This patch separates usage of KERNELBASE and PAGE_OFFSET. I haven't looked at any of the PPC32 code, if we ever want to support Kdump on PPC we'll have to do another audit, ditto for iSeries. This patch makes PAGE_OFFSET the constant, it'll always be 0xC * 1 gazillion for 64-bit. To get a physical address from a virtual one you subtract PAGE_OFFSET, _not_ KERNELBASE. KERNELBASE is the virtual address of the start of the kernel, it's often the same as PAGE_OFFSET, but _might not be_. If you want to know something's offset from the start of the kernel you should subtract KERNELBASE. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r--arch/powerpc/kernel/btext.c4
-rw-r--r--arch/powerpc/kernel/entry_64.S4
-rw-r--r--arch/powerpc/kernel/lparmap.c6
-rw-r--r--arch/powerpc/kernel/machine_kexec_64.c5
4 files changed, 9 insertions, 10 deletions
diff --git a/arch/powerpc/kernel/btext.c b/arch/powerpc/kernel/btext.c
index 893dd24a9f67..5de0d80ca2f2 100644
--- a/arch/powerpc/kernel/btext.c
+++ b/arch/powerpc/kernel/btext.c
@@ -60,7 +60,7 @@ int force_printk_to_btext = 0;
*
* The display is mapped to virtual address 0xD0000000, rather
* than 1:1, because some some CHRP machines put the frame buffer
- * in the region starting at 0xC0000000 (KERNELBASE).
+ * in the region starting at 0xC0000000 (PAGE_OFFSET).
* This mapping is temporary and will disappear as soon as the
* setup done by MMU_Init() is applied.
*
@@ -71,7 +71,7 @@ int force_printk_to_btext = 0;
*/
void __init btext_prepare_BAT(void)
{
- unsigned long vaddr = KERNELBASE + 0x10000000;
+ unsigned long vaddr = PAGE_OFFSET + 0x10000000;
unsigned long addr;
unsigned long lowbits;
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 7b9397169709..aacebb33e98a 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -690,7 +690,7 @@ _GLOBAL(enter_rtas)
/* Setup our real return addr */
SET_REG_TO_LABEL(r4,.rtas_return_loc)
- SET_REG_TO_CONST(r9,KERNELBASE)
+ SET_REG_TO_CONST(r9,PAGE_OFFSET)
sub r4,r4,r9
mtlr r4
@@ -718,7 +718,7 @@ _GLOBAL(enter_rtas)
_STATIC(rtas_return_loc)
/* relocation is off at this point */
mfspr r4,SPRN_SPRG3 /* Get PACA */
- SET_REG_TO_CONST(r5, KERNELBASE)
+ SET_REG_TO_CONST(r5, PAGE_OFFSET)
sub r4,r4,r5 /* RELOC the PACA base pointer */
mfmsr r6
diff --git a/arch/powerpc/kernel/lparmap.c b/arch/powerpc/kernel/lparmap.c
index 5a05a797485f..8a53d436ad9a 100644
--- a/arch/powerpc/kernel/lparmap.c
+++ b/arch/powerpc/kernel/lparmap.c
@@ -16,8 +16,8 @@ const struct LparMap __attribute__((__section__(".text"))) xLparMap = {
.xSegmentTableOffs = STAB0_PAGE,
.xEsids = {
- { .xKernelEsid = GET_ESID(KERNELBASE),
- .xKernelVsid = KERNEL_VSID(KERNELBASE), },
+ { .xKernelEsid = GET_ESID(PAGE_OFFSET),
+ .xKernelVsid = KERNEL_VSID(PAGE_OFFSET), },
{ .xKernelEsid = GET_ESID(VMALLOCBASE),
.xKernelVsid = KERNEL_VSID(VMALLOCBASE), },
},
@@ -25,7 +25,7 @@ const struct LparMap __attribute__((__section__(".text"))) xLparMap = {
.xRanges = {
{ .xPages = HvPagesToMap,
.xOffset = 0,
- .xVPN = KERNEL_VSID(KERNELBASE) << (SID_SHIFT - HW_PAGE_SHIFT),
+ .xVPN = KERNEL_VSID(PAGE_OFFSET) << (SID_SHIFT - HW_PAGE_SHIFT),
},
},
};
diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c
index ec0f06bfc24a..0b0fa4768995 100644
--- a/arch/powerpc/kernel/machine_kexec_64.c
+++ b/arch/powerpc/kernel/machine_kexec_64.c
@@ -153,9 +153,8 @@ void kexec_copy_flush(struct kimage *image)
* including ones that were in place on the original copy
*/
for (i = 0; i < nr_segments; i++)
- flush_icache_range(ranges[i].mem + KERNELBASE,
- ranges[i].mem + KERNELBASE +
- ranges[i].memsz);
+ flush_icache_range((unsigned long)__va(ranges[i].mem),
+ (unsigned long)__va(ranges[i].mem + ranges[i].memsz));
}
#ifdef CONFIG_SMP