diff options
Diffstat (limited to 'arch/powerpc/kernel/head_64.S')
| -rw-r--r-- | arch/powerpc/kernel/head_64.S | 82 |
1 files changed, 77 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index 25e84c0e1166..cc8fb474d520 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -275,7 +275,11 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) . = 0xf00 b performance_monitor_pSeries - STD_EXCEPTION_PSERIES(0xf20, altivec_unavailable) + . = 0xf20 + b altivec_unavailable_pSeries + + . = 0xf40 + b vsx_unavailable_pSeries #ifdef CONFIG_CBE_RAS HSTD_EXCEPTION_PSERIES(0x1200, cbe_system_error) @@ -295,6 +299,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) /* moved from 0xf00 */ STD_EXCEPTION_PSERIES(., performance_monitor) + STD_EXCEPTION_PSERIES(., altivec_unavailable) + STD_EXCEPTION_PSERIES(., vsx_unavailable) /* * An interrupt came in while soft-disabled; clear EE in SRR1, @@ -739,7 +745,8 @@ fp_unavailable_common: ENABLE_INTS bl .kernel_fp_unavailable_exception BUG_OPCODE -1: b .load_up_fpu +1: bl .load_up_fpu + b fast_exception_return .align 7 .globl altivec_unavailable_common @@ -747,7 +754,10 @@ altivec_unavailable_common: EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN) #ifdef CONFIG_ALTIVEC BEGIN_FTR_SECTION - bne .load_up_altivec /* if from user, just load it up */ + beq 1f + bl .load_up_altivec + b fast_exception_return +1: END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) #endif bl .save_nvgprs @@ -827,9 +837,70 @@ _STATIC(load_up_altivec) std r4,0(r3) #endif /* CONFIG_SMP */ /* restore registers and return */ - b fast_exception_return + blr #endif /* CONFIG_ALTIVEC */ + .align 7 + .globl vsx_unavailable_common +vsx_unavailable_common: + EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN) +#ifdef CONFIG_VSX +BEGIN_FTR_SECTION + bne .load_up_vsx +1: +END_FTR_SECTION_IFSET(CPU_FTR_VSX) +#endif + bl .save_nvgprs + addi r3,r1,STACK_FRAME_OVERHEAD + ENABLE_INTS + bl .vsx_unavailable_exception + b .ret_from_except + +#ifdef CONFIG_VSX +/* + * load_up_vsx(unused, unused, tsk) + * Disable VSX for the task which had it previously, + * and save its vector registers in its thread_struct. + * Reuse the fp and vsx saves, but first check to see if they have + * been saved already. + * On entry: r13 == 'current' && last_task_used_vsx != 'current' + */ +_STATIC(load_up_vsx) +/* Load FP and VSX registers if they haven't been done yet */ + andi. r5,r12,MSR_FP + beql+ load_up_fpu /* skip if already loaded */ + andis. r5,r12,MSR_VEC@h + beql+ load_up_altivec /* skip if already loaded */ + +#ifndef CONFIG_SMP + ld r3,last_task_used_vsx@got(r2) + ld r4,0(r3) + cmpdi 0,r4,0 + beq 1f + /* Disable VSX for last_task_used_vsx */ + addi r4,r4,THREAD + ld r5,PT_REGS(r4) + ld r4,_MSR-STACK_FRAME_OVERHEAD(r5) + lis r6,MSR_VSX@h + andc r6,r4,r6 + std r6,_MSR-STACK_FRAME_OVERHEAD(r5) +1: +#endif /* CONFIG_SMP */ + ld r4,PACACURRENT(r13) + addi r4,r4,THREAD /* Get THREAD */ + li r6,1 + stw r6,THREAD_USED_VSR(r4) /* ... also set thread used vsr */ + /* enable use of VSX after return */ + oris r12,r12,MSR_VSX@h + std r12,_MSR(r1) +#ifndef CONFIG_SMP + /* Update last_task_used_math to 'current' */ + ld r4,PACACURRENT(r13) + std r4,0(r3) +#endif /* CONFIG_SMP */ + b fast_exception_return +#endif /* CONFIG_VSX */ + /* * Hash table stuff */ @@ -1127,7 +1198,6 @@ _GLOBAL(generic_secondary_smp_init) 3: HMT_LOW lbz r23,PACAPROCSTART(r13) /* Test if this processor should */ /* start. */ - sync #ifndef CONFIG_SMP b 3b /* Never go on non-SMP */ @@ -1135,6 +1205,8 @@ _GLOBAL(generic_secondary_smp_init) cmpwi 0,r23,0 beq 3b /* Loop until told to go */ + sync /* order paca.run and cur_cpu_spec */ + /* See if we need to call a cpu state restore handler */ LOAD_REG_IMMEDIATE(r23, cur_cpu_spec) ld r23,0(r23) |