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freebsd-skq/sys/powerpc/booke/trap_subr.S
jhibbits f6deaeefad Add more interrupts handled for booke. 
e500mc, e5500, and e6500 all use the normal FPU, with the same behavior as AIM
hardware.  e6500 also supports Altivec, so, although we don't yet have e6500
hardware to test on, add these IVORs as well.  Theoretically, since it boots the
same as a e5500, it should work, single-threaded, single-core, with full altivec
support as of this commit.

With this commit, and some other patches to be committed shortly FreeBSD now
boots on the P5020, single-core, all the way to user space, and should boot just
fine on e500mc.

Relnotes:	Yes (e500mc, e5500 support)
Sponsored by:	Alex Perez/Inertial Computing
2015-12-11 01:23:18 +00:00

963 lines
28 KiB
ArmAsm
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/*-
* Copyright (C) 2006-2009 Semihalf, Rafal Jaworowski <raj@semihalf.com>
* Copyright (C) 2006 Semihalf, Marian Balakowicz <m8@semihalf.com>
* Copyright (C) 2006 Juniper Networks, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
/*-
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* from: $NetBSD: trap_subr.S,v 1.20 2002/04/22 23:20:08 kleink Exp $
*/
/*
* NOTICE: This is not a standalone file. to use it, #include it in
* your port's locore.S, like so:
*
* #include <powerpc/booke/trap_subr.S>
*/
/*
* SPRG usage notes
*
* SPRG0 - pcpu pointer
* SPRG1 - all interrupts except TLB miss, critical, machine check
* SPRG2 - critical
* SPRG3 - machine check
* SPRG4-6 - scratch
*
*/
/* Get the per-CPU data structure */
#define GET_CPUINFO(r) mfsprg0 r
#define RES_GRANULE 32
#define RES_LOCK 0 /* offset to the 'lock' word */
#define RES_RECURSE 4 /* offset to the 'recurse' word */
/*
* Standard interrupt prolog
*
* sprg_sp - SPRG{1-3} reg used to temporarily store the SP
* savearea - temp save area (pc_{tempsave, disisave, critsave, mchksave})
* isrr0-1 - save restore registers with CPU state at interrupt time (may be
* SRR0-1, CSRR0-1, MCSRR0-1
*
* 1. saves in the given savearea:
* - R30-31
* - DEAR, ESR
* - xSRR0-1
*
* 2. saves CR -> R30
*
* 3. switches to kstack if needed
*
* 4. notes:
* - R31 can be used as scratch register until a new frame is layed on
* the stack with FRAME_SETUP
*
* - potential TLB miss: NO. Saveareas are always acessible via TLB1
* permanent entries, and within this prolog we do not dereference any
* locations potentially not in the TLB
*/
#define STANDARD_PROLOG(sprg_sp, savearea, isrr0, isrr1) \
mtspr sprg_sp, %r1; /* Save SP */ \
GET_CPUINFO(%r1); /* Per-cpu structure */ \
stw %r30, (savearea+CPUSAVE_R30)(%r1); \
stw %r31, (savearea+CPUSAVE_R31)(%r1); \
mfdear %r30; \
mfesr %r31; \
stw %r30, (savearea+CPUSAVE_BOOKE_DEAR)(%r1); \
stw %r31, (savearea+CPUSAVE_BOOKE_ESR)(%r1); \
mfspr %r30, isrr0; \
mfspr %r31, isrr1; /* MSR at interrupt time */ \
stw %r30, (savearea+CPUSAVE_SRR0)(%r1); \
stw %r31, (savearea+CPUSAVE_SRR1)(%r1); \
isync; \
mfspr %r1, sprg_sp; /* Restore SP */ \
mfcr %r30; /* Save CR */ \
/* switch to per-thread kstack if intr taken in user mode */ \
mtcr %r31; /* MSR at interrupt time */ \
bf 17, 1f; \
GET_CPUINFO(%r1); /* Per-cpu structure */ \
lwz %r1, PC_CURPCB(%r1); /* Per-thread kernel stack */ \
1:
#define STANDARD_CRIT_PROLOG(sprg_sp, savearea, isrr0, isrr1) \
mtspr sprg_sp, %r1; /* Save SP */ \
GET_CPUINFO(%r1); /* Per-cpu structure */ \
stw %r30, (savearea+CPUSAVE_R30)(%r1); \
stw %r31, (savearea+CPUSAVE_R31)(%r1); \
mfdear %r30; \
mfesr %r31; \
stw %r30, (savearea+CPUSAVE_BOOKE_DEAR)(%r1); \
stw %r31, (savearea+CPUSAVE_BOOKE_ESR)(%r1); \
mfspr %r30, isrr0; \
mfspr %r31, isrr1; /* MSR at interrupt time */ \
stw %r30, (savearea+CPUSAVE_SRR0)(%r1); \
stw %r31, (savearea+CPUSAVE_SRR1)(%r1); \
mfspr %r30, SPR_SRR0; \
mfspr %r31, SPR_SRR1; /* MSR at interrupt time */ \
stw %r30, (savearea+CPUSAVE_SRR0+8)(%r1); \
stw %r31, (savearea+CPUSAVE_SRR1+8)(%r1); \
isync; \
mfspr %r1, sprg_sp; /* Restore SP */ \
mfcr %r30; /* Save CR */ \
/* switch to per-thread kstack if intr taken in user mode */ \
mtcr %r31; /* MSR at interrupt time */ \
bf 17, 1f; \
GET_CPUINFO(%r1); /* Per-cpu structure */ \
lwz %r1, PC_CURPCB(%r1); /* Per-thread kernel stack */ \
1:
/*
* FRAME_SETUP assumes:
* SPRG{1-3} SP at the time interrupt occured
* savearea r30-r31, DEAR, ESR, xSRR0-1
* r30 CR
* r31 scratch
* r1 kernel stack
*
* sprg_sp - SPRG reg containing SP at the time interrupt occured
* savearea - temp save
* exc - exception number (EXC_xxx)
*
* 1. sets a new frame
* 2. saves in the frame:
* - R0, R1 (SP at the time of interrupt), R2, LR, CR
* - R3-31 (R30-31 first restored from savearea)
* - XER, CTR, DEAR, ESR (from savearea), xSRR0-1
*
* Notes:
* - potential TLB miss: YES, since we make dereferences to kstack, which
* can happen not covered (we can have up to two DTLB misses if fortunate
* enough i.e. when kstack crosses page boundary and both pages are
* untranslated)
*/
#define FRAME_SETUP(sprg_sp, savearea, exc) \
mfspr %r31, sprg_sp; /* get saved SP */ \
/* establish a new stack frame and put everything on it */ \
stwu %r31, -FRAMELEN(%r1); \
stw %r0, FRAME_0+8(%r1); /* save r0 in the trapframe */ \
stw %r31, FRAME_1+8(%r1); /* save SP " " */ \
stw %r2, FRAME_2+8(%r1); /* save r2 " " */ \
mflr %r31; \
stw %r31, FRAME_LR+8(%r1); /* save LR " " */ \
stw %r30, FRAME_CR+8(%r1); /* save CR " " */ \
GET_CPUINFO(%r2); \
lwz %r30, (savearea+CPUSAVE_R30)(%r2); /* get saved r30 */ \
lwz %r31, (savearea+CPUSAVE_R31)(%r2); /* get saved r31 */ \
/* save R3-31 */ \
stmw %r3, FRAME_3+8(%r1) ; \
/* save DEAR, ESR */ \
lwz %r28, (savearea+CPUSAVE_BOOKE_DEAR)(%r2); \
lwz %r29, (savearea+CPUSAVE_BOOKE_ESR)(%r2); \
stw %r28, FRAME_BOOKE_DEAR+8(%r1); \
stw %r29, FRAME_BOOKE_ESR+8(%r1); \
/* save XER, CTR, exc number */ \
mfxer %r3; \
mfctr %r4; \
stw %r3, FRAME_XER+8(%r1); \
stw %r4, FRAME_CTR+8(%r1); \
li %r5, exc; \
stw %r5, FRAME_EXC+8(%r1); \
/* save DBCR0 */ \
mfspr %r3, SPR_DBCR0; \
stw %r3, FRAME_BOOKE_DBCR0+8(%r1); \
/* save xSSR0-1 */ \
lwz %r30, (savearea+CPUSAVE_SRR0)(%r2); \
lwz %r31, (savearea+CPUSAVE_SRR1)(%r2); \
stw %r30, FRAME_SRR0+8(%r1); \
stw %r31, FRAME_SRR1+8(%r1); \
lwz %r2,PC_CURTHREAD(%r2) /* set curthread pointer */
/*
*
* isrr0-1 - save restore registers to restore CPU state to (may be
* SRR0-1, CSRR0-1, MCSRR0-1
*
* Notes:
* - potential TLB miss: YES. The deref'd kstack may be not covered
*/
#define FRAME_LEAVE(isrr0, isrr1) \
/* restore CTR, XER, LR, CR */ \
lwz %r4, FRAME_CTR+8(%r1); \
lwz %r5, FRAME_XER+8(%r1); \
lwz %r6, FRAME_LR+8(%r1); \
lwz %r7, FRAME_CR+8(%r1); \
mtctr %r4; \
mtxer %r5; \
mtlr %r6; \
mtcr %r7; \
/* restore DBCR0 */ \
lwz %r4, FRAME_BOOKE_DBCR0+8(%r1); \
mtspr SPR_DBCR0, %r4; \
/* restore xSRR0-1 */ \
lwz %r30, FRAME_SRR0+8(%r1); \
lwz %r31, FRAME_SRR1+8(%r1); \
mtspr isrr0, %r30; \
mtspr isrr1, %r31; \
/* restore R2-31, SP */ \
lmw %r2, FRAME_2+8(%r1) ; \
lwz %r0, FRAME_0+8(%r1); \
lwz %r1, FRAME_1+8(%r1); \
isync
/*
* TLB miss prolog
*
* saves LR, CR, SRR0-1, R20-31 in the TLBSAVE area
*
* Notes:
* - potential TLB miss: NO. It is crucial that we do not generate a TLB
* miss within the TLB prolog itself!
* - TLBSAVE is always translated
*/
#define TLB_PROLOG \
mtsprg4 %r1; /* Save SP */ \
mtsprg5 %r28; \
mtsprg6 %r29; \
/* calculate TLB nesting level and TLBSAVE instance address */ \
GET_CPUINFO(%r1); /* Per-cpu structure */ \
lwz %r28, PC_BOOKE_TLB_LEVEL(%r1); \
rlwinm %r29, %r28, 6, 23, 25; /* 4 x TLBSAVE_LEN */ \
addi %r28, %r28, 1; \
stw %r28, PC_BOOKE_TLB_LEVEL(%r1); \
addi %r29, %r29, PC_BOOKE_TLBSAVE@l; \
add %r1, %r1, %r29; /* current TLBSAVE ptr */ \
\
/* save R20-31 */ \
mfsprg5 %r28; \
mfsprg6 %r29; \
stmw %r20, (TLBSAVE_BOOKE_R20)(%r1); \
/* save LR, CR */ \
mflr %r30; \
mfcr %r31; \
stw %r30, (TLBSAVE_BOOKE_LR)(%r1); \
stw %r31, (TLBSAVE_BOOKE_CR)(%r1); \
/* save SRR0-1 */ \
mfsrr0 %r30; /* execution addr at interrupt time */ \
mfsrr1 %r31; /* MSR at interrupt time*/ \
stw %r30, (TLBSAVE_BOOKE_SRR0)(%r1); /* save SRR0 */ \
stw %r31, (TLBSAVE_BOOKE_SRR1)(%r1); /* save SRR1 */ \
isync; \
mfsprg4 %r1
/*
* restores LR, CR, SRR0-1, R20-31 from the TLBSAVE area
*
* same notes as for the TLB_PROLOG
*/
#define TLB_RESTORE \
mtsprg4 %r1; /* Save SP */ \
GET_CPUINFO(%r1); /* Per-cpu structure */ \
/* calculate TLB nesting level and TLBSAVE instance addr */ \
lwz %r28, PC_BOOKE_TLB_LEVEL(%r1); \
subi %r28, %r28, 1; \
stw %r28, PC_BOOKE_TLB_LEVEL(%r1); \
rlwinm %r29, %r28, 6, 23, 25; /* 4 x TLBSAVE_LEN */ \
addi %r29, %r29, PC_BOOKE_TLBSAVE@l; \
add %r1, %r1, %r29; \
\
/* restore LR, CR */ \
lwz %r30, (TLBSAVE_BOOKE_LR)(%r1); \
lwz %r31, (TLBSAVE_BOOKE_CR)(%r1); \
mtlr %r30; \
mtcr %r31; \
/* restore SRR0-1 */ \
lwz %r30, (TLBSAVE_BOOKE_SRR0)(%r1); \
lwz %r31, (TLBSAVE_BOOKE_SRR1)(%r1); \
mtsrr0 %r30; \
mtsrr1 %r31; \
/* restore R20-31 */ \
lmw %r20, (TLBSAVE_BOOKE_R20)(%r1); \
mfsprg4 %r1
#ifdef SMP
#define TLB_LOCK \
GET_CPUINFO(%r20); \
lwz %r21, PC_CURTHREAD(%r20); \
lwz %r22, PC_BOOKE_TLB_LOCK(%r20); \
\
1: lwarx %r23, 0, %r22; \
cmpwi %r23, TLB_UNLOCKED; \
beq 2f; \
\
/* check if this is recursion */ \
cmplw cr0, %r21, %r23; \
bne- 1b; \
\
2: /* try to acquire lock */ \
stwcx. %r21, 0, %r22; \
bne- 1b; \
\
/* got it, update recursion counter */ \
lwz %r21, RES_RECURSE(%r22); \
addi %r21, %r21, 1; \
stw %r21, RES_RECURSE(%r22); \
isync; \
msync
#define TLB_UNLOCK \
GET_CPUINFO(%r20); \
lwz %r21, PC_CURTHREAD(%r20); \
lwz %r22, PC_BOOKE_TLB_LOCK(%r20); \
\
/* update recursion counter */ \
lwz %r23, RES_RECURSE(%r22); \
subi %r23, %r23, 1; \
stw %r23, RES_RECURSE(%r22); \
\
cmpwi %r23, 0; \
bne 1f; \
isync; \
msync; \
\
/* release the lock */ \
li %r23, TLB_UNLOCKED; \
stw %r23, 0(%r22); \
1: isync; \
msync
#else
#define TLB_LOCK
#define TLB_UNLOCK
#endif /* SMP */
#define INTERRUPT(label) \
.globl label; \
.align 5; \
CNAME(label):
/*
* Interrupt handling routines in BookE can be flexibly placed and do not have
* to live in pre-defined vectors location. Note they need to be TLB-mapped at
* all times in order to be able to handle exceptions. We thus arrange for
* them to be part of kernel text which is always TLB-accessible.
*
* The interrupt handling routines have to be 16 bytes aligned: we align them
* to 32 bytes (cache line length) which supposedly performs better.
*
*/
.text
.globl CNAME(interrupt_vector_base)
.align 5
interrupt_vector_base:
/*****************************************************************************
* Catch-all handler to handle uninstalled IVORs
****************************************************************************/
INTERRUPT(int_unknown)
STANDARD_PROLOG(SPR_SPRG1, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1)
FRAME_SETUP(SPR_SPRG1, PC_TEMPSAVE, EXC_RSVD)
b trap_common
/*****************************************************************************
* Critical input interrupt
****************************************************************************/
INTERRUPT(int_critical_input)
STANDARD_CRIT_PROLOG(SPR_SPRG2, PC_BOOKE_CRITSAVE, SPR_CSRR0, SPR_CSRR1)
FRAME_SETUP(SPR_SPRG2, PC_BOOKE_CRITSAVE, EXC_CRIT)
addi %r3, %r1, 8
bl CNAME(powerpc_interrupt)
FRAME_LEAVE(SPR_CSRR0, SPR_CSRR1)
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)
addi %r3, %r1, 8
bl CNAME(powerpc_interrupt)
FRAME_LEAVE(SPR_MCSRR0, SPR_MCSRR1)
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)
addi %r3, %r1, 8
bl CNAME(powerpc_interrupt)
b clear_we
INTERRUPT(int_alignment)
STANDARD_PROLOG(SPR_SPRG1, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1)
FRAME_SETUP(SPR_SPRG1, PC_TEMPSAVE, EXC_ALI)
b trap_common
INTERRUPT(int_program)
STANDARD_PROLOG(SPR_SPRG1, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1)
FRAME_SETUP(SPR_SPRG1, PC_TEMPSAVE, EXC_PGM)
b trap_common
INTERRUPT(int_fpu)
STANDARD_PROLOG(SPR_SPRG1, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1)
FRAME_SETUP(SPR_SPRG1, PC_TEMPSAVE, EXC_FPU)
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)
addi %r3, %r1, 8
bl CNAME(powerpc_interrupt)
b clear_we
/*****************************************************************************
* 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
/*****************************************************************************
* Altivec Unavailable interrupt
****************************************************************************/
INTERRUPT(int_vec)
STANDARD_PROLOG(SPR_SPRG1, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1)
FRAME_SETUP(SPR_SPRG1, PC_TEMPSAVE, EXC_VEC)
b trap_common
/*****************************************************************************
* Watchdog interrupt
****************************************************************************/
INTERRUPT(int_vecast)
STANDARD_PROLOG(SPR_SPRG1, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1)
FRAME_SETUP(SPR_SPRG1, PC_TEMPSAVE, EXC_VECAST_E)
b trap_common
#ifdef HWPMC_HOOKS
/*****************************************************************************
* PMC Interrupt
****************************************************************************/
INTERRUPT(int_performance_counter)
STANDARD_PROLOG(SPR_SPRG3, PC_TEMPSAVE, SPR_SRR0, SPR_SRR1)
FRAME_SETUP(SPR_SPRG3, PC_TEMPSAVE, EXC_PERF)
addi %r3, %r1, 8
bl CNAME(powerpc_interrupt)
b trapexit
#endif
/*****************************************************************************
* Data TLB miss interrupt
*
* 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 - unused
* r29 - saved mas0
* r28 - saved mas1
* r27 - saved mas2
* r26 - pmap address
* r25 - pte address
*
* r20:r23 - scratch registers
****************************************************************************/
INTERRUPT(int_data_tlb_error)
TLB_PROLOG
TLB_LOCK
mfdear %r31
/*
* Save MAS0-MAS2 registers. There might be another tlb miss during
* pte lookup overwriting current contents (which was hw filled).
*/
mfspr %r29, SPR_MAS0
mfspr %r28, SPR_MAS1
mfspr %r27, SPR_MAS2
/* Check faulting address. */
lis %r21, VM_MAXUSER_ADDRESS@h
ori %r21, %r21, VM_MAXUSER_ADDRESS@l
cmplw cr0, %r31, %r21
blt search_user_pmap
/* If it's kernel address, allow only supervisor mode misses. */
mfsrr1 %r21
mtcr %r21
bt 17, search_failed /* check MSR[PR] */
search_kernel_pmap:
/* Load r26 with kernel_pmap address */
bl 1f
.long kernel_pmap_store-.
1: mflr %r21
lwz %r26, 0(%r21)
add %r26, %r21, %r26 /* kernel_pmap_store in r26 */
/* Force kernel tid, set TID to 0 in MAS1. */
li %r21, 0
rlwimi %r28, %r21, 0, 8, 15 /* clear TID bits */
tlb_miss_handle:
/* This may result in nested tlb miss. */
bl pte_lookup /* returns PTE address in R25 */
cmpwi %r25, 0 /* pte found? */
beq search_failed
/* Finish up, write TLB entry. */
bl tlb_fill_entry
tlb_miss_return:
TLB_UNLOCK
TLB_RESTORE
rfi
search_user_pmap:
/* Load r26 with current user space process pmap */
GET_CPUINFO(%r26)
lwz %r26, PC_CURPMAP(%r26)
b tlb_miss_handle
search_failed:
/*
* Whenever we don't find a TLB mapping in PT, set a TLB0 entry with
* the faulting virtual address anyway, but put a fake RPN and no
* access rights. This should cause a following {D,I}SI exception.
*/
lis %r23, 0xffff0000@h /* revoke all permissions */
/* Load MAS registers. */
mtspr SPR_MAS0, %r29
isync
mtspr SPR_MAS1, %r28
isync
mtspr SPR_MAS2, %r27
isync
mtspr SPR_MAS3, %r23
isync
bl zero_mas7
bl zero_mas8
tlbwe
msync
isync
b tlb_miss_return
/*****************************************************************************
*
* Return pte address that corresponds to given pmap/va. If there is no valid
* entry return 0.
*
* input: r26 - pmap
* input: r31 - dear
* output: r25 - pte address
*
* scratch regs used: r21
*
****************************************************************************/
pte_lookup:
cmpwi %r26, 0
beq 1f /* fail quickly if pmap is invalid */
srwi %r21, %r31, PDIR_SHIFT /* pdir offset */
slwi %r21, %r21, PDIR_ENTRY_SHIFT /* multiply by pdir entry size */
addi %r25, %r26, PM_PDIR /* pmap pm_dir[] address */
add %r25, %r25, %r21 /* offset within pm_pdir[] table */
/*
* 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
lis %r21, PTBL_MASK@h
ori %r21, %r21, PTBL_MASK@l
and %r21, %r21, %r31
/* ptbl offset, multiply by ptbl entry size */
srwi %r21, %r21, (PTBL_SHIFT - PTBL_ENTRY_SHIFT)
add %r25, %r25, %r21 /* address of pte entry */
/*
* 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:
li %r25, 0
2:
blr
/*****************************************************************************
*
* Load MAS1-MAS3 registers with data, write TLB entry
*
* input:
* r29 - mas0
* r28 - mas1
* r27 - mas2
* r25 - pte
*
* output: none
*
* scratch regs: r21-r23
*
****************************************************************************/
tlb_fill_entry:
/*
* Update PTE flags: we have to do it atomically, as pmap_protect()
* running on other CPUs could attempt to update the flags at the same
* time.
*/
li %r23, PTE_FLAGS
1:
lwarx %r21, %r23, %r25 /* get pte->flags */
oris %r21, %r21, PTE_REFERENCED@h /* set referenced bit */
andi. %r22, %r21, (PTE_SW | PTE_UW)@l /* check if writable */
beq 2f
oris %r21, %r21, PTE_MODIFIED@h /* set modified bit */
2:
stwcx. %r21, %r23, %r25 /* write it back */
bne- 1b
/* Update MAS2. */
rlwimi %r27, %r21, 0, 27, 30 /* insert WIMG bits from pte */
/* Setup MAS3 value in r23. */
lwz %r23, PTE_RPN(%r25) /* get pte->rpn */
rlwinm %r22, %r23, 12, 0, 20 /* extract MAS3 portion of RPN */
rlwimi %r22, %r21, 24, 26, 31 /* insert protection bits from pte */
rlwinm %r23, %r23, 12, 28, 31 /* MAS7 portion of RPN */
/* Load MAS registers. */
mtspr SPR_MAS0, %r29
isync
mtspr SPR_MAS1, %r28
isync
mtspr SPR_MAS2, %r27
isync
mtspr SPR_MAS3, %r22
isync
mtspr SPR_MAS7, %r23
isync
mflr %r21
bl zero_mas8
mtlr %r21
tlbwe
isync
msync
blr
/*****************************************************************************
* Instruction TLB miss interrupt
*
* Same notes as for the Data TLB miss
****************************************************************************/
INTERRUPT(int_inst_tlb_error)
TLB_PROLOG
TLB_LOCK
mfsrr0 %r31 /* faulting address */
/*
* Save MAS0-MAS2 registers. There might be another tlb miss during pte
* lookup overwriting current contents (which was hw filled).
*/
mfspr %r29, SPR_MAS0
mfspr %r28, SPR_MAS1
mfspr %r27, SPR_MAS2
mfsrr1 %r21
mtcr %r21
/* check MSR[PR] */
bt 17, search_user_pmap
b search_kernel_pmap
.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)
GET_CPUINFO(%r3)
lwz %r3, (PC_BOOKE_CRITSAVE+CPUSAVE_SRR0)(%r3)
bl 0f
.long interrupt_vector_base-.
.long interrupt_vector_top-.
0: mflr %r5
lwz %r4,0(%r5) /* interrupt_vector_base in r4 */
add %r4,%r4,%r5
cmplw cr0, %r3, %r4
blt 1f
lwz %r4,4(%r5) /* interrupt_vector_top in r4 */
add %r4,%r4,%r5
addi %r4,%r4,4
cmplw cr0, %r3, %r4
bge 1f
/* Disable single-stepping for the interrupt handlers. */
lwz %r3, FRAME_SRR1+8(%r1);
rlwinm %r3, %r3, 0, 23, 21
stw %r3, FRAME_SRR1+8(%r1);
/* Restore srr0 and srr1 as they could have been clobbered. */
GET_CPUINFO(%r4)
lwz %r3, (PC_BOOKE_CRITSAVE+CPUSAVE_SRR0+8)(%r4);
mtspr SPR_SRR0, %r3
lwz %r4, (PC_BOOKE_CRITSAVE+CPUSAVE_SRR1+8)(%r4);
mtspr SPR_SRR1, %r4
b 9f
1:
addi %r3, %r1, 8
bl CNAME(trap)
/*
* Handle ASTs, needed for proper support of single-stepping.
* We actually need to return to the process with an rfi.
*/
b trapexit
9:
FRAME_LEAVE(SPR_CSRR0, SPR_CSRR1)
rfci
/*****************************************************************************
* Common trap code
****************************************************************************/
trap_common:
/* Call C trap dispatcher */
addi %r3, %r1, 8
bl CNAME(trap)
.globl CNAME(trapexit) /* exported for db_backtrace use */
CNAME(trapexit):
/* disable interrupts */
wrteei 0
/* Test AST pending - makes sense for user process only */
lwz %r5, FRAME_SRR1+8(%r1)
mtcr %r5
bf 17, 1f
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
and. %r4, %r4, %r5
beq 1f
/* re-enable interrupts before calling ast() */
wrteei 1
addi %r3, %r1, 8
bl CNAME(ast)
.globl CNAME(asttrapexit) /* db_backtrace code sentinel #2 */
CNAME(asttrapexit):
b trapexit /* test ast ret value ? */
1:
FRAME_LEAVE(SPR_SRR0, SPR_SRR1)
rfi
#if defined(KDB)
/*
* Deliberate entry to dbtrap
*/
.globl CNAME(breakpoint)
CNAME(breakpoint):
mtsprg1 %r1
mfmsr %r3
mtsrr1 %r3
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)
mflr %r31
mtsrr0 %r31
mfdear %r30
mfesr %r31
stw %r30, (PC_DBSAVE+CPUSAVE_BOOKE_DEAR)(%r3)
stw %r31, (PC_DBSAVE+CPUSAVE_BOOKE_ESR)(%r3)
mfsrr0 %r30
mfsrr1 %r31
stw %r30, (PC_DBSAVE+CPUSAVE_SRR0)(%r3)
stw %r31, (PC_DBSAVE+CPUSAVE_SRR1)(%r3)
isync
mfcr %r30
/*
* Now the kdb trap catching code.
*/
dbtrap:
FRAME_SETUP(SPR_SPRG1, PC_DBSAVE, EXC_DEBUG)
/* Call C trap code: */
addi %r3, %r1, 8
bl CNAME(db_trap_glue)
or. %r3, %r3, %r3
bne dbleave
/* This wasn't for KDB, so switch to real trap: */
b trap_common
dbleave:
FRAME_LEAVE(SPR_SRR0, SPR_SRR1)
rfi
#endif /* KDB */
clear_we:
lwz %r3, (FRAME_SRR1+8)(%r1)
rlwinm %r3, %r3, 0, 14, 12
stw %r3, (FRAME_SRR1+8)(%r1)
b trapexit
#ifdef SMP
ENTRY(tlb_lock)
GET_CPUINFO(%r5)
lwz %r5, PC_CURTHREAD(%r5)
1: lwarx %r4, 0, %r3
cmpwi %r4, TLB_UNLOCKED
bne 1b
stwcx. %r5, 0, %r3
bne- 1b
isync
msync
blr
ENTRY(tlb_unlock)
isync
msync
li %r4, TLB_UNLOCKED
stw %r4, 0(%r3)
isync
msync
blr
/*
* TLB miss spin locks. For each CPU we have a reservation granule (32 bytes);
* only a single word from this granule will actually be used as a spin lock
* for mutual exclusion between TLB miss handler and pmap layer that
* manipulates page table contents.
*/
.data
.align 5
GLOBAL(tlb0_miss_locks)
.space RES_GRANULE * MAXCPU
#endif
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