From a481347383d33e8c1038a628826ecd7d52e3ec00 Mon Sep 17 00:00:00 2001 From: raj Date: Tue, 13 Jan 2009 16:19:58 +0000 Subject: Clean up BookE low-level exceptions code. Improve comments, fix style(9) and typos, unify separators. Obtained from: Freescale, Semihalf --- sys/powerpc/booke/trap_subr.S | 95 ++++++++++++++++++++++--------------------- 1 file changed, 49 insertions(+), 46 deletions(-) (limited to 'sys/powerpc') diff --git a/sys/powerpc/booke/trap_subr.S b/sys/powerpc/booke/trap_subr.S index dab9d19..f7a54a6 100644 --- a/sys/powerpc/booke/trap_subr.S +++ b/sys/powerpc/booke/trap_subr.S @@ -127,7 +127,7 @@ bf 17, 1f; \ GET_CPUINFO(%r1); /* Per-cpu structure */ \ lwz %r1, PC_CURPCB(%r1); /* Per-thread kernel stack */ \ -1: +1: #define STANDARD_CRIT_PROLOG(sprg_sp, savearea, isrr0, isrr1) \ mtspr sprg_sp, %r1; /* Save SP */ \ @@ -213,7 +213,6 @@ stw %r30, FRAME_SRR0+8(1); \ stw %r31, FRAME_SRR1+8(1) - /* * * isrr0-1 - save restore registers to restore CPU state to (may be @@ -250,7 +249,7 @@ * * Notes: * - potential TLB miss: NO. It is crucial that we do not generate a TLB - * miss withing the TLB prolog itself! + * miss within the TLB prolog itself! * - TLBSAVE is always translated */ #define TLB_PROLOG \ @@ -334,9 +333,9 @@ .align 5 interrupt_vector_base: -/**************************************** +/***************************************************************************** * Critical input interrupt - ****************************************/ + ****************************************************************************/ INTERRUPT(int_critical_input) STANDARD_PROLOG(SPR_SPRG2, PC_BOOKE_CRITSAVE, SPR_CSRR0, SPR_CSRR1) FRAME_SETUP(SPR_SPRG2, PC_BOOKE_CRITSAVE, EXC_CRIT) @@ -346,9 +345,9 @@ INTERRUPT(int_critical_input) rfci -/**************************************** +/***************************************************************************** * Machine check interrupt - ****************************************/ + ****************************************************************************/ INTERRUPT(int_machine_check) STANDARD_PROLOG(SPR_SPRG3, PC_BOOKE_MCHKSAVE, SPR_MCSRR0, SPR_MCSRR1) FRAME_SETUP(SPR_SPRG3, PC_BOOKE_MCHKSAVE, EXC_MCHK) @@ -358,27 +357,27 @@ INTERRUPT(int_machine_check) rfmci -/**************************************** +/***************************************************************************** * Data storage interrupt - ****************************************/ + ****************************************************************************/ INTERRUPT(int_data_storage) STANDARD_PROLOG(SPR_SPRG1, PC_DISISAVE, SPR_SRR0, SPR_SRR1) FRAME_SETUP(SPR_SPRG1, PC_DISISAVE, EXC_DSI) b trap_common -/**************************************** +/***************************************************************************** * Instruction storage interrupt - ****************************************/ + ****************************************************************************/ INTERRUPT(int_instr_storage) STANDARD_PROLOG(SPR_SPRG1, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1) FRAME_SETUP(SPR_SPRG1, PC_TEMPSAVE, EXC_ISI) b trap_common -/**************************************** +/***************************************************************************** * External input interrupt - ****************************************/ + ****************************************************************************/ INTERRUPT(int_external_input) STANDARD_PROLOG(SPR_SPRG1, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1) FRAME_SETUP(SPR_SPRG1, PC_TEMPSAVE, EXC_EXI) @@ -398,18 +397,18 @@ INTERRUPT(int_program) b trap_common -/**************************************** +/***************************************************************************** * System call - ****************************************/ + ****************************************************************************/ INTERRUPT(int_syscall) STANDARD_PROLOG(SPR_SPRG1, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1) FRAME_SETUP(SPR_SPRG1, PC_TEMPSAVE, EXC_SC) b trap_common -/**************************************** +/***************************************************************************** * Decrementer interrupt - ****************************************/ + ****************************************************************************/ INTERRUPT(int_decrementer) STANDARD_PROLOG(SPR_SPRG1, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1) FRAME_SETUP(SPR_SPRG1, PC_TEMPSAVE, EXC_DECR) @@ -418,36 +417,34 @@ INTERRUPT(int_decrementer) b trapexit -/**************************************** +/***************************************************************************** * Fixed interval timer - ****************************************/ + ****************************************************************************/ INTERRUPT(int_fixed_interval_timer) STANDARD_PROLOG(SPR_SPRG1, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1) FRAME_SETUP(SPR_SPRG1, PC_TEMPSAVE, EXC_FIT) b trap_common -/**************************************** +/***************************************************************************** * Watchdog interrupt - ****************************************/ + ****************************************************************************/ INTERRUPT(int_watchdog) STANDARD_PROLOG(SPR_SPRG1, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1) FRAME_SETUP(SPR_SPRG1, PC_TEMPSAVE, EXC_WDOG) b trap_common -/**************************************** +/***************************************************************************** * Data TLB miss interrupt * - * There can be nested TLB misses - while - * handling a TLB miss we dereference data - * structures that may be not covered by - * translations. We support up to + * There can be nested TLB misses - while handling a TLB miss we reference + * data structures that may be not covered by translations. We support up to * TLB_NESTED_MAX-1 nested misses. * * Registers use: * r31 - dear - * r30 - tlb0 entry address + * r30 - unused * r29 - saved mas0 * r28 - saved mas1 * r27 - saved mas2 @@ -455,7 +452,7 @@ INTERRUPT(int_watchdog) * r25 - pte address * * r20:r23 - scratch registers - ****************************************/ + ****************************************************************************/ INTERRUPT(int_data_tlb_error) TLB_PROLOG @@ -554,8 +551,11 @@ pte_lookup: addi %r25, %r26, PM_PDIR /* pmap pm_dir[] address */ add %r25, %r25, %r21 /* offset within pm_pdir[] table */ - lwz %r25, 0(%r25) /* get ptbl address, i.e. pmap->pm_pdir[pdir_idx] */ - + /* + * Get ptbl address, i.e. pmap->pm_pdir[pdir_idx] + * This load may cause a Data TLB miss for non-kernel pmap! + */ + lwz %r25, 0(%r25) cmpwi %r25, 0 beq 2f @@ -567,7 +567,11 @@ pte_lookup: srwi %r21, %r21, (PTBL_SHIFT - PTBL_ENTRY_SHIFT) add %r25, %r25, %r21 /* address of pte entry */ - lwz %r21, PTE_FLAGS(%r25) /* get pte->flags */ + /* + * Get pte->flags + * This load may cause a Data TLB miss for non-kernel pmap! + */ + lwz %r21, PTE_FLAGS(%r25) andis. %r21, %r21, PTE_VALID@h bne 2f 1: @@ -631,12 +635,11 @@ tlb_fill_entry: msync blr -/**************************************** +/***************************************************************************** * Instruction TLB miss interrupt * * Same notes as for the Data TLB miss - * - ****************************************/ + ****************************************************************************/ INTERRUPT(int_inst_tlb_error) TLB_PROLOG @@ -661,9 +664,9 @@ INTERRUPT(int_inst_tlb_error) .globl interrupt_vector_top interrupt_vector_top: -/**************************************** +/***************************************************************************** * Debug interrupt - ****************************************/ + ****************************************************************************/ INTERRUPT(int_debug) STANDARD_CRIT_PROLOG(SPR_SPRG2, PC_BOOKE_CRITSAVE, SPR_CSRR0, SPR_CSRR1) FRAME_SETUP(SPR_SPRG2, PC_BOOKE_CRITSAVE, EXC_DEBUG) @@ -678,7 +681,7 @@ INTERRUPT(int_debug) bge 1f /* Disable single-stepping for the interrupt handlers. */ lwz %r3, FRAME_SRR1+8(%r1); - rlwinm %r3,%r3,0,23,21 + rlwinm %r3, %r3, 0, 23, 21 stw %r3, FRAME_SRR1+8(%r1); /* Restore srr0 and srr1 as they could have been clobbered. */ lwz %r3, (PC_BOOKE_CRITSAVE+CPUSAVE_SRR0+8)(%r2); @@ -699,9 +702,9 @@ INTERRUPT(int_debug) rfci -/******************************** +/***************************************************************************** * Common trap code - ********************************/ + ****************************************************************************/ trap_common: /* Call C trap dispatcher */ addi %r3, %r1, 8 @@ -720,8 +723,8 @@ CNAME(trapexit): GET_CPUINFO(%r3) lwz %r4, PC_CURTHREAD(%r3) lwz %r4, TD_FLAGS(%r4) - lis %r5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@h - ori %r5, %r5, (TDF_ASTPENDING|TDF_NEEDRESCHED)@l + lis %r5, (TDF_ASTPENDING | TDF_NEEDRESCHED)@h + ori %r5, %r5, (TDF_ASTPENDING | TDF_NEEDRESCHED)@l and. %r4, %r4, %r5 beq 1f @@ -747,12 +750,12 @@ CNAME(breakpoint): mtsprg1 %r1 mfmsr %r3 mtsrr1 %r3 - andi. %r3,%r3,~(PSL_EE|PSL_ME)@l + andi. %r3, %r3, ~(PSL_EE | PSL_ME)@l mtmsr %r3 /* disable interrupts */ isync GET_CPUINFO(%r3) - stw %r30,(PC_DBSAVE+CPUSAVE_R30)(%r3) - stw %r31,(PC_DBSAVE+CPUSAVE_R31)(%r3) + stw %r30, (PC_DBSAVE+CPUSAVE_R30)(%r3) + stw %r31, (PC_DBSAVE+CPUSAVE_R31)(%r3) mflr %r31 mtsrr0 %r31 @@ -776,9 +779,9 @@ CNAME(breakpoint): dbtrap: FRAME_SETUP(SPR_SPRG1, PC_DBSAVE, EXC_DEBUG) /* Call C trap code: */ - addi %r3,%r1,8 + addi %r3, %r1, 8 bl CNAME(db_trap_glue) - or. %r3,%r3,%r3 + or. %r3, %r3, %r3 bne dbleave /* This wasn't for KDB, so switch to real trap: */ b trap_common -- cgit v1.1