+++ /dev/null
-#ifndef __HEAD_BOOKE_H__
-#define __HEAD_BOOKE_H__
-
-/*
- * Macros used for common Book-e exception handling
- */
-
-#define SET_IVOR(vector_number, vector_label) \
- li r26,vector_label@l; \
- mtspr SPRN_IVOR##vector_number,r26; \
- sync
-
-#define NORMAL_EXCEPTION_PROLOG \
- mtspr SPRN_SPRG0,r10; /* save two registers to work with */\
- mtspr SPRN_SPRG1,r11; \
- mtspr SPRN_SPRG4W,r1; \
- mfcr r10; /* save CR in r10 for now */\
- mfspr r11,SPRN_SRR1; /* check whether user or kernel */\
- andi. r11,r11,MSR_PR; \
- beq 1f; \
- mfspr r1,SPRN_SPRG3; /* if from user, start at top of */\
- lwz r1,THREAD_INFO-THREAD(r1); /* this thread's kernel stack */\
- addi r1,r1,THREAD_SIZE; \
-1: subi r1,r1,INT_FRAME_SIZE; /* Allocate an exception frame */\
- mr r11,r1; \
- stw r10,_CCR(r11); /* save various registers */\
- stw r12,GPR12(r11); \
- stw r9,GPR9(r11); \
- mfspr r10,SPRN_SPRG0; \
- stw r10,GPR10(r11); \
- mfspr r12,SPRN_SPRG1; \
- stw r12,GPR11(r11); \
- mflr r10; \
- stw r10,_LINK(r11); \
- mfspr r10,SPRN_SPRG4R; \
- mfspr r12,SPRN_SRR0; \
- stw r10,GPR1(r11); \
- mfspr r9,SPRN_SRR1; \
- stw r10,0(r11); \
- rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
- stw r0,GPR0(r11); \
- SAVE_4GPRS(3, r11); \
- SAVE_2GPRS(7, r11)
-
-/* To handle the additional exception priority levels on 40x and Book-E
- * processors we allocate a 4k stack per additional priority level. The various
- * head_xxx.S files allocate space (exception_stack_top) for each priority's
- * stack times the number of CPUs
- *
- * On 40x critical is the only additional level
- * On 44x/e500 we have critical and machine check
- * On e200 we have critical and debug (machine check occurs via critical)
- *
- * Additionally we reserve a SPRG for each priority level so we can free up a
- * GPR to use as the base for indirect access to the exception stacks. This
- * is necessary since the MMU is always on, for Book-E parts, and the stacks
- * are offset from KERNELBASE.
- *
- */
-#define BOOKE_EXCEPTION_STACK_SIZE (8192)
-
-/* CRIT_SPRG only used in critical exception handling */
-#define CRIT_SPRG SPRN_SPRG2
-/* MCHECK_SPRG only used in machine check exception handling */
-#define MCHECK_SPRG SPRN_SPRG6W
-
-#define MCHECK_STACK_TOP (exception_stack_top - 4096)
-#define CRIT_STACK_TOP (exception_stack_top)
-
-/* only on e200 for now */
-#define DEBUG_STACK_TOP (exception_stack_top - 4096)
-#define DEBUG_SPRG SPRN_SPRG6W
-
-#ifdef CONFIG_SMP
-#define BOOKE_LOAD_EXC_LEVEL_STACK(level) \
- mfspr r8,SPRN_PIR; \
- mulli r8,r8,BOOKE_EXCEPTION_STACK_SIZE; \
- neg r8,r8; \
- addis r8,r8,level##_STACK_TOP@ha; \
- addi r8,r8,level##_STACK_TOP@l
-#else
-#define BOOKE_LOAD_EXC_LEVEL_STACK(level) \
- lis r8,level##_STACK_TOP@h; \
- ori r8,r8,level##_STACK_TOP@l
-#endif
-
-/*
- * Exception prolog for critical/machine check exceptions. This is a
- * little different from the normal exception prolog above since a
- * critical/machine check exception can potentially occur at any point
- * during normal exception processing. Thus we cannot use the same SPRG
- * registers as the normal prolog above. Instead we use a portion of the
- * critical/machine check exception stack at low physical addresses.
- */
-#define EXC_LEVEL_EXCEPTION_PROLOG(exc_level, exc_level_srr0, exc_level_srr1) \
- mtspr exc_level##_SPRG,r8; \
- BOOKE_LOAD_EXC_LEVEL_STACK(exc_level);/* r8 points to the exc_level stack*/ \
- stw r10,GPR10-INT_FRAME_SIZE(r8); \
- stw r11,GPR11-INT_FRAME_SIZE(r8); \
- mfcr r10; /* save CR in r10 for now */\
- mfspr r11,exc_level_srr1; /* check whether user or kernel */\
- andi. r11,r11,MSR_PR; \
- mr r11,r8; \
- mfspr r8,exc_level##_SPRG; \
- beq 1f; \
- /* COMING FROM USER MODE */ \
- mfspr r11,SPRN_SPRG3; /* if from user, start at top of */\
- lwz r11,THREAD_INFO-THREAD(r11); /* this thread's kernel stack */\
- addi r11,r11,THREAD_SIZE; \
-1: subi r11,r11,INT_FRAME_SIZE; /* Allocate an exception frame */\
- stw r10,_CCR(r11); /* save various registers */\
- stw r12,GPR12(r11); \
- stw r9,GPR9(r11); \
- mflr r10; \
- stw r10,_LINK(r11); \
- mfspr r12,SPRN_DEAR; /* save DEAR and ESR in the frame */\
- stw r12,_DEAR(r11); /* since they may have had stuff */\
- mfspr r9,SPRN_ESR; /* in them at the point where the */\
- stw r9,_ESR(r11); /* exception was taken */\
- mfspr r12,exc_level_srr0; \
- stw r1,GPR1(r11); \
- mfspr r9,exc_level_srr1; \
- stw r1,0(r11); \
- mr r1,r11; \
- rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
- stw r0,GPR0(r11); \
- SAVE_4GPRS(3, r11); \
- SAVE_2GPRS(7, r11)
-
-#define CRITICAL_EXCEPTION_PROLOG \
- EXC_LEVEL_EXCEPTION_PROLOG(CRIT, SPRN_CSRR0, SPRN_CSRR1)
-#define DEBUG_EXCEPTION_PROLOG \
- EXC_LEVEL_EXCEPTION_PROLOG(DEBUG, SPRN_DSRR0, SPRN_DSRR1)
-#define MCHECK_EXCEPTION_PROLOG \
- EXC_LEVEL_EXCEPTION_PROLOG(MCHECK, SPRN_MCSRR0, SPRN_MCSRR1)
-
-/*
- * Exception vectors.
- */
-#define START_EXCEPTION(label) \
- .align 5; \
-label:
-
-#define FINISH_EXCEPTION(func) \
- bl transfer_to_handler_full; \
- .long func; \
- .long ret_from_except_full
-
-#define EXCEPTION(n, label, hdlr, xfer) \
- START_EXCEPTION(label); \
- NORMAL_EXCEPTION_PROLOG; \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
- xfer(n, hdlr)
-
-#define CRITICAL_EXCEPTION(n, label, hdlr) \
- START_EXCEPTION(label); \
- CRITICAL_EXCEPTION_PROLOG; \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
- EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
- NOCOPY, crit_transfer_to_handler, \
- ret_from_crit_exc)
-
-#define MCHECK_EXCEPTION(n, label, hdlr) \
- START_EXCEPTION(label); \
- MCHECK_EXCEPTION_PROLOG; \
- mfspr r5,SPRN_ESR; \
- stw r5,_ESR(r11); \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
- EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
- NOCOPY, mcheck_transfer_to_handler, \
- ret_from_mcheck_exc)
-
-#define EXC_XFER_TEMPLATE(hdlr, trap, msr, copyee, tfer, ret) \
- li r10,trap; \
- stw r10,TRAP(r11); \
- lis r10,msr@h; \
- ori r10,r10,msr@l; \
- copyee(r10, r9); \
- bl tfer; \
- .long hdlr; \
- .long ret
-
-#define COPY_EE(d, s) rlwimi d,s,0,16,16
-#define NOCOPY(d, s)
-
-#define EXC_XFER_STD(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, NOCOPY, transfer_to_handler_full, \
- ret_from_except_full)
-
-#define EXC_XFER_LITE(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, NOCOPY, transfer_to_handler, \
- ret_from_except)
-
-#define EXC_XFER_EE(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, COPY_EE, transfer_to_handler_full, \
- ret_from_except_full)
-
-#define EXC_XFER_EE_LITE(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, COPY_EE, transfer_to_handler, \
- ret_from_except)
-
-/* Check for a single step debug exception while in an exception
- * handler before state has been saved. This is to catch the case
- * where an instruction that we are trying to single step causes
- * an exception (eg ITLB/DTLB miss) and thus the first instruction of
- * the exception handler generates a single step debug exception.
- *
- * If we get a debug trap on the first instruction of an exception handler,
- * we reset the MSR_DE in the _exception handler's_ MSR (the debug trap is
- * a critical exception, so we are using SPRN_CSRR1 to manipulate the MSR).
- * The exception handler was handling a non-critical interrupt, so it will
- * save (and later restore) the MSR via SPRN_CSRR1, which will still have
- * the MSR_DE bit set.
- */
-#define DEBUG_EXCEPTION \
- START_EXCEPTION(Debug); \
- CRITICAL_EXCEPTION_PROLOG; \
- \
- /* \
- * If there is a single step or branch-taken exception in an \
- * exception entry sequence, it was probably meant to apply to \
- * the code where the exception occurred (since exception entry \
- * doesn't turn off DE automatically). We simulate the effect \
- * of turning off DE on entry to an exception handler by turning \
- * off DE in the CSRR1 value and clearing the debug status. \
- */ \
- mfspr r10,SPRN_DBSR; /* check single-step/branch taken */ \
- andis. r10,r10,DBSR_IC@h; \
- beq+ 2f; \
- \
- lis r10,KERNELBASE@h; /* check if exception in vectors */ \
- ori r10,r10,KERNELBASE@l; \
- cmplw r12,r10; \
- blt+ 2f; /* addr below exception vectors */ \
- \
- lis r10,Debug@h; \
- ori r10,r10,Debug@l; \
- cmplw r12,r10; \
- bgt+ 2f; /* addr above exception vectors */ \
- \
- /* here it looks like we got an inappropriate debug exception. */ \
-1: rlwinm r9,r9,0,~MSR_DE; /* clear DE in the CSRR1 value */ \
- lis r10,DBSR_IC@h; /* clear the IC event */ \
- mtspr SPRN_DBSR,r10; \
- /* restore state and get out */ \
- lwz r10,_CCR(r11); \
- lwz r0,GPR0(r11); \
- lwz r1,GPR1(r11); \
- mtcrf 0x80,r10; \
- mtspr SPRN_CSRR0,r12; \
- mtspr SPRN_CSRR1,r9; \
- lwz r9,GPR9(r11); \
- lwz r12,GPR12(r11); \
- mtspr CRIT_SPRG,r8; \
- BOOKE_LOAD_EXC_LEVEL_STACK(CRIT); /* r8 points to the debug stack */ \
- lwz r10,GPR10-INT_FRAME_SIZE(r8); \
- lwz r11,GPR11-INT_FRAME_SIZE(r8); \
- mfspr r8,CRIT_SPRG; \
- \
- rfci; \
- b .; \
- \
- /* continue normal handling for a critical exception... */ \
-2: mfspr r4,SPRN_DBSR; \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
- EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), NOCOPY, crit_transfer_to_handler, ret_from_crit_exc)
-
-#define INSTRUCTION_STORAGE_EXCEPTION \
- START_EXCEPTION(InstructionStorage) \
- NORMAL_EXCEPTION_PROLOG; \
- mfspr r5,SPRN_ESR; /* Grab the ESR and save it */ \
- stw r5,_ESR(r11); \
- mr r4,r12; /* Pass SRR0 as arg2 */ \
- li r5,0; /* Pass zero as arg3 */ \
- EXC_XFER_EE_LITE(0x0400, handle_page_fault)
-
-#define ALIGNMENT_EXCEPTION \
- START_EXCEPTION(Alignment) \
- NORMAL_EXCEPTION_PROLOG; \
- mfspr r4,SPRN_DEAR; /* Grab the DEAR and save it */ \
- stw r4,_DEAR(r11); \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
- EXC_XFER_EE(0x0600, alignment_exception)
-
-#define PROGRAM_EXCEPTION \
- START_EXCEPTION(Program) \
- NORMAL_EXCEPTION_PROLOG; \
- mfspr r4,SPRN_ESR; /* Grab the ESR and save it */ \
- stw r4,_ESR(r11); \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
- EXC_XFER_STD(0x0700, program_check_exception)
-
-#define DECREMENTER_EXCEPTION \
- START_EXCEPTION(Decrementer) \
- NORMAL_EXCEPTION_PROLOG; \
- lis r0,TSR_DIS@h; /* Setup the DEC interrupt mask */ \
- mtspr SPRN_TSR,r0; /* Clear the DEC interrupt */ \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
- EXC_XFER_LITE(0x0900, timer_interrupt)
-
-#define FP_UNAVAILABLE_EXCEPTION \
- START_EXCEPTION(FloatingPointUnavailable) \
- NORMAL_EXCEPTION_PROLOG; \
- bne load_up_fpu; /* if from user, just load it up */ \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
- EXC_XFER_EE_LITE(0x800, kernel_fp_unavailable_exception)
-
-#endif /* __HEAD_BOOKE_H__ */
git.samba.org / sfrench / cifs-2.6.git / blobdiff