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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-07-14 20:52:54 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-08-20 10:12:27 +1000 |
| commit | ee43eb788b3a06425fffb912677e2e1c8b00dd3b (patch) | |
| tree | 7233cb47647837ab00af81270b3a16555d88a1f1 /arch/powerpc/kernel/cpu_setup_6xx.S | |
| parent | 8aa34ab8b2dc96ca6c4feecfb87ed13f0d40ef98 (diff) | |
| download | lwn-ee43eb788b3a06425fffb912677e2e1c8b00dd3b.tar.gz lwn-ee43eb788b3a06425fffb912677e2e1c8b00dd3b.zip | |
powerpc: Use names rather than numbers for SPRGs (v2)
The kernel uses SPRG registers for various purposes, typically in
low level assembly code as scratch registers or to hold per-cpu
global infos such as the PACA or the current thread_info pointer.
We want to be able to easily shuffle the usage of those registers
as some implementations have specific constraints realted to some
of them, for example, some have userspace readable aliases, etc..
and the current choice isn't always the best.
This patch should not change any code generation, and replaces the
usage of SPRN_SPRGn everywhere in the kernel with a named replacement
and adds documentation next to the definition of the names as to
what those are used for on each processor family.
The only parts that still use the original numbers are bits of KVM
or suspend/resume code that just blindly needs to save/restore all
the SPRGs.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/cpu_setup_6xx.S')
| -rw-r--r-- | arch/powerpc/kernel/cpu_setup_6xx.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/cpu_setup_6xx.S b/arch/powerpc/kernel/cpu_setup_6xx.S index 1e9949e68856..55cba4a8a959 100644 --- a/arch/powerpc/kernel/cpu_setup_6xx.S +++ b/arch/powerpc/kernel/cpu_setup_6xx.S @@ -21,7 +21,7 @@ _GLOBAL(__setup_cpu_603) mflr r4 BEGIN_MMU_FTR_SECTION li r10,0 - mtspr SPRN_SPRG4,r10 /* init SW LRU tracking */ + mtspr SPRN_SPRG_603_LRU,r10 /* init SW LRU tracking */ END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU) BEGIN_FTR_SECTION bl __init_fpu_registers |