diff options
| author | Michael Ellerman <michael@ellerman.id.au> | 2005-12-05 17:24:33 +0100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-01-09 04:51:54 +0100 |
| commit | b5666f70395016a55cc9d57826508b8a346398d0 (patch) | |
| tree | 39d74718c2bc3f2fcba6456fdc39a6a0de3d78bd /arch/powerpc/mm/slb.c | |
| parent | [PATCH] powerpc: Add a is_kernel_addr() macro (diff) | |
| download | linux-b5666f70395016a55cc9d57826508b8a346398d0.tar.xz linux-b5666f70395016a55cc9d57826508b8a346398d0.zip | |
[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/mm/slb.c')
| -rw-r--r-- | arch/powerpc/mm/slb.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c index a47b273600ec..cc22570856af 100644 --- a/arch/powerpc/mm/slb.c +++ b/arch/powerpc/mm/slb.c @@ -75,7 +75,7 @@ static void slb_flush_and_rebolt(void) vflags = SLB_VSID_KERNEL | virtual_llp; ksp_esid_data = mk_esid_data(get_paca()->kstack, 2); - if ((ksp_esid_data & ESID_MASK) == KERNELBASE) + if ((ksp_esid_data & ESID_MASK) == PAGE_OFFSET) ksp_esid_data &= ~SLB_ESID_V; /* We need to do this all in asm, so we're sure we don't touch @@ -213,7 +213,7 @@ void slb_initialize(void) asm volatile("isync":::"memory"); asm volatile("slbmte %0,%0"::"r" (0) : "memory"); asm volatile("isync; slbia; isync":::"memory"); - create_slbe(KERNELBASE, lflags, 0); + create_slbe(PAGE_OFFSET, lflags, 0); /* VMALLOC space has 4K pages always for now */ create_slbe(VMALLOCBASE, vflags, 1); |