diff options
Diffstat (limited to 'arch/powerpc/kernel/head_64.S')
| -rw-r--r-- | arch/powerpc/kernel/head_64.S | 110 |
1 files changed, 77 insertions, 33 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index 645c7f10fb28..c93d9f35a121 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -35,9 +35,7 @@ #include <asm/thread_info.h> #include <asm/firmware.h> -#ifdef CONFIG_PPC_ISERIES #define DO_SOFT_DISABLE -#endif /* * We layout physical memory as follows: @@ -308,7 +306,9 @@ exception_marker: std r9,_LINK(r1); \ mfctr r10; /* save CTR in stackframe */ \ std r10,_CTR(r1); \ + lbz r10,PACASOFTIRQEN(r13); \ mfspr r11,SPRN_XER; /* save XER in stackframe */ \ + std r10,SOFTE(r1); \ std r11,_XER(r1); \ li r9,(n)+1; \ std r9,_TRAP(r1); /* set trap number */ \ @@ -343,6 +343,34 @@ label##_pSeries: \ EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common) +#define MASKABLE_EXCEPTION_PSERIES(n, label) \ + . = n; \ + .globl label##_pSeries; \ +label##_pSeries: \ + HMT_MEDIUM; \ + mtspr SPRN_SPRG1,r13; /* save r13 */ \ + mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \ + std r9,PACA_EXGEN+EX_R9(r13); /* save r9, r10 */ \ + std r10,PACA_EXGEN+EX_R10(r13); \ + lbz r10,PACASOFTIRQEN(r13); \ + mfcr r9; \ + cmpwi r10,0; \ + beq masked_interrupt; \ + mfspr r10,SPRN_SPRG1; \ + std r10,PACA_EXGEN+EX_R13(r13); \ + std r11,PACA_EXGEN+EX_R11(r13); \ + std r12,PACA_EXGEN+EX_R12(r13); \ + clrrdi r12,r13,32; /* get high part of &label */ \ + mfmsr r10; \ + mfspr r11,SPRN_SRR0; /* save SRR0 */ \ + LOAD_HANDLER(r12,label##_common) \ + ori r10,r10,MSR_IR|MSR_DR|MSR_RI; \ + mtspr SPRN_SRR0,r12; \ + mfspr r12,SPRN_SRR1; /* and SRR1 */ \ + mtspr SPRN_SRR1,r10; \ + rfid; \ + b . /* prevent speculative execution */ + #define STD_EXCEPTION_ISERIES(n, label, area) \ .globl label##_iSeries; \ label##_iSeries: \ @@ -358,40 +386,32 @@ label##_iSeries: \ HMT_MEDIUM; \ mtspr SPRN_SPRG1,r13; /* save r13 */ \ EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN); \ - lbz r10,PACAPROCENABLED(r13); \ + lbz r10,PACASOFTIRQEN(r13); \ cmpwi 0,r10,0; \ beq- label##_iSeries_masked; \ EXCEPTION_PROLOG_ISERIES_2; \ b label##_common; \ -#ifdef DO_SOFT_DISABLE +#ifdef CONFIG_PPC_ISERIES #define DISABLE_INTS \ -BEGIN_FW_FTR_SECTION; \ - lbz r10,PACAPROCENABLED(r13); \ li r11,0; \ - std r10,SOFTE(r1); \ + stb r11,PACASOFTIRQEN(r13); \ +BEGIN_FW_FTR_SECTION; \ + stb r11,PACAHARDIRQEN(r13); \ +END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES); \ +BEGIN_FW_FTR_SECTION; \ mfmsr r10; \ - stb r11,PACAPROCENABLED(r13); \ ori r10,r10,MSR_EE; \ mtmsrd r10,1; \ END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) -#define ENABLE_INTS \ -BEGIN_FW_FTR_SECTION; \ - lbz r10,PACAPROCENABLED(r13); \ - mfmsr r11; \ - std r10,SOFTE(r1); \ - ori r11,r11,MSR_EE; \ -END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES); \ -BEGIN_FW_FTR_SECTION; \ - ld r12,_MSR(r1); \ - mfmsr r11; \ - rlwimi r11,r12,0,MSR_EE; \ -END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES); \ - mtmsrd r11,1 +#else +#define DISABLE_INTS \ + li r11,0; \ + stb r11,PACASOFTIRQEN(r13); \ + stb r11,PACAHARDIRQEN(r13) -#else /* hard enable/disable interrupts */ -#define DISABLE_INTS +#endif /* CONFIG_PPC_ISERIES */ #define ENABLE_INTS \ ld r12,_MSR(r1); \ @@ -399,8 +419,6 @@ END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES); \ rlwimi r11,r12,0,MSR_EE; \ mtmsrd r11,1 -#endif - #define STD_EXCEPTION_COMMON(trap, label, hdlr) \ .align 7; \ .globl label##_common; \ @@ -541,11 +559,11 @@ instruction_access_slb_pSeries: mfspr r12,SPRN_SRR1 /* and SRR1 */ b .slb_miss_realmode /* Rel. branch works in real mode */ - STD_EXCEPTION_PSERIES(0x500, hardware_interrupt) + MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt) STD_EXCEPTION_PSERIES(0x600, alignment) STD_EXCEPTION_PSERIES(0x700, program_check) STD_EXCEPTION_PSERIES(0x800, fp_unavailable) - STD_EXCEPTION_PSERIES(0x900, decrementer) + MASKABLE_EXCEPTION_PSERIES(0x900, decrementer) STD_EXCEPTION_PSERIES(0xa00, trap_0a) STD_EXCEPTION_PSERIES(0xb00, trap_0b) @@ -597,7 +615,24 @@ system_call_pSeries: /*** pSeries interrupt support ***/ /* moved from 0xf00 */ - STD_EXCEPTION_PSERIES(., performance_monitor) + MASKABLE_EXCEPTION_PSERIES(., performance_monitor) + +/* + * An interrupt came in while soft-disabled; clear EE in SRR1, + * clear paca->hard_enabled and return. + */ +masked_interrupt: + stb r10,PACAHARDIRQEN(r13) + mtcrf 0x80,r9 + ld r9,PACA_EXGEN+EX_R9(r13) + mfspr r10,SPRN_SRR1 + rldicl r10,r10,48,1 /* clear MSR_EE */ + rotldi r10,r10,16 + mtspr SPRN_SRR1,r10 + ld r10,PACA_EXGEN+EX_R10(r13) + mfspr r13,SPRN_SPRG1 + rfid + b . .align 7 _GLOBAL(do_stab_bolted_pSeries) @@ -952,7 +987,8 @@ fast_exception_return: REST_8GPRS(2, r1) mfmsr r10 - clrrdi r10,r10,2 /* clear RI (LE is 0 already) */ + rldicl r10,r10,48,1 /* clear EE */ + rldicr r10,r10,16,61 /* clear RI (LE is 0 already) */ mtmsrd r10,1 mtspr SPRN_SRR1,r12 @@ -1877,11 +1913,16 @@ _GLOBAL(__secondary_start) /* enable MMU and jump to start_secondary */ LOAD_REG_ADDR(r3, .start_secondary_prolog) LOAD_REG_IMMEDIATE(r4, MSR_KERNEL) -#ifdef DO_SOFT_DISABLE +#ifdef CONFIG_PPC_ISERIES BEGIN_FW_FTR_SECTION ori r4,r4,MSR_EE END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) #endif +BEGIN_FW_FTR_SECTION + stb r7,PACASOFTIRQEN(r13) + stb r7,PACAHARDIRQEN(r13) +END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES) + mtspr SPRN_SRR0,r3 mtspr SPRN_SRR1,r4 rfid @@ -2019,15 +2060,18 @@ _STATIC(start_here_common) /* Load up the kernel context */ 5: -#ifdef DO_SOFT_DISABLE -BEGIN_FW_FTR_SECTION li r5,0 - stb r5,PACAPROCENABLED(r13) /* Soft Disabled */ + stb r5,PACASOFTIRQEN(r13) /* Soft Disabled */ +#ifdef CONFIG_PPC_ISERIES +BEGIN_FW_FTR_SECTION mfmsr r5 ori r5,r5,MSR_EE /* Hard Enabled */ mtmsrd r5 END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) #endif +BEGIN_FW_FTR_SECTION + stb r5,PACAHARDIRQEN(r13) +END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES) bl .start_kernel |