powerpc: Fix some 6xx/7xxx CPU setup functions

Some of those functions try to adjust the CPU features, for example
to remove NAP support on some revisions. However, they seem to use
r5 as an index into the CPU table entry, which might have been right
a long time ago but no longer is. r4 is the right register to use.

This probably caused some off behaviours on some PowerMac variants
using 750cx or 7455 processor revisions.

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

diff --git a/arch/powerpc/kernel/cpu_setup_6xx.S b/arch/powerpc/kernel/cpu_setup_6xx.S
index 55cba4a8a9599031d4b81202a61de73b4cfa88ec..f8cd9fba4d35b082325c5d34e404774a447ae881 100644 (file)
--- a/arch/powerpc/kernel/cpu_setup_6xx.S
+++ b/arch/powerpc/kernel/cpu_setup_6xx.S
@@ -18,7 +18,7 @@
 #include <asm/mmu.h>
 
 _GLOBAL(__setup_cpu_603)
-       mflr    r4
+       mflr    r5
 BEGIN_MMU_FTR_SECTION
        li      r10,0
        mtspr   SPRN_SPRG_603_LRU,r10           /* init SW LRU tracking */
@@ -27,60 +27,60 @@ BEGIN_FTR_SECTION
        bl      __init_fpu_registers
 END_FTR_SECTION_IFCLR(CPU_FTR_FPU_UNAVAILABLE)
        bl      setup_common_caches
-       mtlr    r4
+       mtlr    r5
        blr
 _GLOBAL(__setup_cpu_604)
-       mflr    r4
+       mflr    r5
        bl      setup_common_caches
        bl      setup_604_hid0
-       mtlr    r4
+       mtlr    r5
        blr
 _GLOBAL(__setup_cpu_750)
-       mflr    r4
+       mflr    r5
        bl      __init_fpu_registers
        bl      setup_common_caches
        bl      setup_750_7400_hid0
-       mtlr    r4
+       mtlr    r5
        blr
 _GLOBAL(__setup_cpu_750cx)
-       mflr    r4
+       mflr    r5
        bl      __init_fpu_registers
        bl      setup_common_caches
        bl      setup_750_7400_hid0
        bl      setup_750cx
-       mtlr    r4
+       mtlr    r5
        blr
 _GLOBAL(__setup_cpu_750fx)
-       mflr    r4
+       mflr    r5
        bl      __init_fpu_registers
        bl      setup_common_caches
        bl      setup_750_7400_hid0
        bl      setup_750fx
-       mtlr    r4
+       mtlr    r5
        blr
 _GLOBAL(__setup_cpu_7400)
-       mflr    r4
+       mflr    r5
        bl      __init_fpu_registers
        bl      setup_7400_workarounds
        bl      setup_common_caches
        bl      setup_750_7400_hid0
-       mtlr    r4
+       mtlr    r5
        blr
 _GLOBAL(__setup_cpu_7410)
-       mflr    r4
+       mflr    r5
        bl      __init_fpu_registers
        bl      setup_7410_workarounds
        bl      setup_common_caches
        bl      setup_750_7400_hid0
        li      r3,0
        mtspr   SPRN_L2CR2,r3
-       mtlr    r4
+       mtlr    r5
        blr
 _GLOBAL(__setup_cpu_745x)
-       mflr    r4
+       mflr    r5
        bl      setup_common_caches
        bl      setup_745x_specifics
-       mtlr    r4
+       mtlr    r5
        blr
 
 /* Enable caches for 603's, 604, 750 & 7400 */
@@ -194,10 +194,10 @@ setup_750cx:
        cror    4*cr0+eq,4*cr0+eq,4*cr1+eq
        cror    4*cr0+eq,4*cr0+eq,4*cr2+eq
        bnelr
-       lwz     r6,CPU_SPEC_FEATURES(r5)
+       lwz     r6,CPU_SPEC_FEATURES(r4)
        li      r7,CPU_FTR_CAN_NAP
        andc    r6,r6,r7
-       stw     r6,CPU_SPEC_FEATURES(r5)
+       stw     r6,CPU_SPEC_FEATURES(r4)
        blr
 
 /* 750fx specific
@@ -225,12 +225,12 @@ BEGIN_FTR_SECTION
        andis.  r11,r11,L3CR_L3E@h
        beq     1f
 END_FTR_SECTION_IFSET(CPU_FTR_L3CR)
-       lwz     r6,CPU_SPEC_FEATURES(r5)
+       lwz     r6,CPU_SPEC_FEATURES(r4)
        andi.   r0,r6,CPU_FTR_L3_DISABLE_NAP
        beq     1f
        li      r7,CPU_FTR_CAN_NAP
        andc    r6,r6,r7
-       stw     r6,CPU_SPEC_FEATURES(r5)
+       stw     r6,CPU_SPEC_FEATURES(r4)
 1:
        mfspr   r11,SPRN_HID0