From: Benjamin Herrenschmidt Some G3 CPUs can crash in funny way if a store from an FPU register instruction is executed on a register that has never been initialized since power on. This patch fixes it by making sure all FP registers have been properly initialized at kernel boot and when waking from sleep. It also makes the code that decides wether HID0_BTIC and HID0_DPM are allowed on a given CPU smarter (it can actually _clear_ them now if they are not allowed instead of just setting them when they are allowed in case the firmware got them wrong) Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Andrew Morton --- 25-akpm/arch/ppc/kernel/cpu_setup_6xx.S | 42 +++++++++++++++++++++++++++----- 25-akpm/arch/ppc/platforms/pmac_sleep.S | 4 +++ 2 files changed, 40 insertions(+), 6 deletions(-) diff -puN arch/ppc/kernel/cpu_setup_6xx.S~ppc32-fix-errata-for-some-g3-cpus arch/ppc/kernel/cpu_setup_6xx.S --- 25/arch/ppc/kernel/cpu_setup_6xx.S~ppc32-fix-errata-for-some-g3-cpus 2005-04-04 23:10:25.000000000 -0700 +++ 25-akpm/arch/ppc/kernel/cpu_setup_6xx.S 2005-04-04 23:10:25.000000000 -0700 @@ -30,12 +30,14 @@ _GLOBAL(__setup_cpu_604) blr _GLOBAL(__setup_cpu_750) mflr r4 + bl __init_fpu_registers bl setup_common_caches bl setup_750_7400_hid0 mtlr r4 blr _GLOBAL(__setup_cpu_750cx) mflr r4 + bl __init_fpu_registers bl setup_common_caches bl setup_750_7400_hid0 bl setup_750cx @@ -43,6 +45,7 @@ _GLOBAL(__setup_cpu_750cx) blr _GLOBAL(__setup_cpu_750fx) mflr r4 + bl __init_fpu_registers bl setup_common_caches bl setup_750_7400_hid0 bl setup_750fx @@ -50,6 +53,7 @@ _GLOBAL(__setup_cpu_750fx) blr _GLOBAL(__setup_cpu_7400) mflr r4 + bl __init_fpu_registers bl setup_7400_workarounds bl setup_common_caches bl setup_750_7400_hid0 @@ -57,6 +61,7 @@ _GLOBAL(__setup_cpu_7400) blr _GLOBAL(__setup_cpu_7410) mflr r4 + bl __init_fpu_registers bl setup_7410_workarounds bl setup_common_caches bl setup_750_7400_hid0 @@ -80,7 +85,7 @@ setup_common_caches: bne 1f /* don't invalidate the D-cache */ ori r8,r8,HID0_DCI /* unless it wasn't enabled */ 1: sync - mtspr SPRN_HID0,r8 /* enable and invalidate caches */ + mtspr SPRN_HID0,r8 /* enable and invalidate caches */ sync mtspr SPRN_HID0,r11 /* enable caches */ sync @@ -152,9 +157,13 @@ setup_7410_workarounds: setup_750_7400_hid0: mfspr r11,SPRN_HID0 ori r11,r11,HID0_SGE | HID0_ABE | HID0_BHTE | HID0_BTIC + oris r11,r11,HID0_DPM@h BEGIN_FTR_SECTION - oris r11,r11,HID0_DPM@h /* enable dynamic power mgmt */ -END_FTR_SECTION_IFCLR(CPU_FTR_NO_DPM) + xori r11,r11,HID0_BTIC +END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC) +BEGIN_FTR_SECTION + xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */ +END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM) li r3,HID0_SPD andc r11,r11,r3 /* clear SPD: enable speculative */ li r3,0 @@ -218,13 +227,15 @@ setup_745x_specifics: /* All of the bits we have to set..... */ - ori r11,r11,HID0_SGE | HID0_FOLD | HID0_BHTE | HID0_LRSTK | HID0_BTIC + ori r11,r11,HID0_SGE | HID0_FOLD | HID0_BHTE + ori r11,r11,HID0_LRSTK | HID0_BTIC + oris r11,r11,HID0_DPM@h BEGIN_FTR_SECTION xori r11,r11,HID0_BTIC END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC) BEGIN_FTR_SECTION - oris r11,r11,HID0_DPM@h /* enable dynamic power mgmt */ -END_FTR_SECTION_IFCLR(CPU_FTR_NO_DPM) + xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */ +END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM) /* All of the bits we have to clear.... */ @@ -248,6 +259,25 @@ END_FTR_SECTION_IFCLR(CPU_FTR_NO_DPM) isync blr +/* + * Initialize the FPU registers. This is needed to work around an errata + * in some 750 cpus where using a not yet initialized FPU register after + * power on reset may hang the CPU + */ +_GLOBAL(__init_fpu_registers) + mfmsr r10 + ori r11,r10,MSR_FP + mtmsr r11 + isync + addis r9,r3,empty_zero_page@ha + addi r9,r9,empty_zero_page@l + REST_32FPRS(0,r9) + sync + mtmsr r10 + isync + blr + + /* Definitions for the table use to save CPU states */ #define CS_HID0 0 #define CS_HID1 4 diff -puN arch/ppc/platforms/pmac_sleep.S~ppc32-fix-errata-for-some-g3-cpus arch/ppc/platforms/pmac_sleep.S --- 25/arch/ppc/platforms/pmac_sleep.S~ppc32-fix-errata-for-some-g3-cpus 2005-04-04 23:10:25.000000000 -0700 +++ 25-akpm/arch/ppc/platforms/pmac_sleep.S 2005-04-04 23:10:25.000000000 -0700 @@ -267,6 +267,10 @@ grackle_wake_up: /* Restore various CPU config stuffs */ bl __restore_cpu_setup + /* Make sure all FPRs have been initialized */ + bl reloc_offset + bl __init_fpu_registers + /* Invalidate & enable L1 cache, we don't care about * whatever the ROM may have tried to write to memory */ _