[deliverable/linux.git] / arch / blackfin / include / asm / entry.h

#ifndef __BFIN_ENTRY_H
#define __BFIN_ENTRY_H

#include <asm/setup.h>
#include <asm/page.h>

#ifdef __ASSEMBLY__

#define	LFLUSH_I_AND_D	0x00000808
#define	LSIGTRAP	5

/* process bits for task_struct.flags */
#define	PF_TRACESYS_OFF	3
#define	PF_TRACESYS_BIT	5
#define	PF_PTRACED_OFF	3
#define	PF_PTRACED_BIT	4
#define	PF_DTRACE_OFF	1
#define	PF_DTRACE_BIT	5

/*
 * NOTE!  The single-stepping code assumes that all interrupt handlers
 * start by saving SYSCFG on the stack with their first instruction.
 */

/* This one is used for exceptions, emulation, and NMI.  It doesn't push
   RETI and doesn't do cli.  */
#define SAVE_ALL_SYS		save_context_no_interrupts
/* This is used for all normal interrupts.  It saves a minimum of registers
   to the stack, loads the IRQ number, and jumps to common code.  */
#ifdef CONFIG_IPIPE
# define LOAD_IPIPE_IPEND \
	P0.l = lo(IPEND); \
	P0.h = hi(IPEND); \
	R1 = [P0];
#else
# define LOAD_IPIPE_IPEND
#endif

/*
 * Workaround for anomalies 05000283 and 05000315
 */
#if ANOMALY_05000283 || ANOMALY_05000315
# define ANOMALY_283_315_WORKAROUND(preg, dreg)		\
	cc = dreg == dreg;				\
	preg.h = HI(CHIPID);				\
	preg.l = LO(CHIPID);				\
	if cc jump 1f;					\
	dreg.l = W[preg];				\
1:
#else
# define ANOMALY_283_315_WORKAROUND(preg, dreg)
#endif /* ANOMALY_05000283 || ANOMALY_05000315 */

#ifndef CONFIG_EXACT_HWERR
/* As a debugging aid - we save IPEND when DEBUG_KERNEL is on,
 * otherwise it is a waste of cycles.
 */
# ifndef CONFIG_DEBUG_KERNEL
#define INTERRUPT_ENTRY(N)						\
    [--sp] = SYSCFG;							\
    [--sp] = P0;	/*orig_p0*/					\
    [--sp] = R0;	/*orig_r0*/					\
    [--sp] = (R7:0,P5:0);						\
    R0 = (N);								\
    LOAD_IPIPE_IPEND							\
    jump __common_int_entry;
# else /* CONFIG_DEBUG_KERNEL */
#define INTERRUPT_ENTRY(N)						\
    [--sp] = SYSCFG;							\
    [--sp] = P0;	/*orig_p0*/					\
    [--sp] = R0;	/*orig_r0*/					\
    [--sp] = (R7:0,P5:0);						\
    p0.l = lo(IPEND);							\
    p0.h = hi(IPEND);							\
    r1 = [p0];								\
    R0 = (N);								\
    LOAD_IPIPE_IPEND							\
    jump __common_int_entry;
# endif /* CONFIG_DEBUG_KERNEL */

/* For timer interrupts, we need to save IPEND, since the user_mode
 *macro accesses it to determine where to account time.
 */
#define TIMER_INTERRUPT_ENTRY(N)					\
    [--sp] = SYSCFG;							\
    [--sp] = P0;	/*orig_p0*/					\
    [--sp] = R0;	/*orig_r0*/					\
    [--sp] = (R7:0,P5:0);						\
    p0.l = lo(IPEND);							\
    p0.h = hi(IPEND);							\
    r1 = [p0];								\
    R0 = (N);								\
    jump __common_int_entry;
#else /* CONFIG_EXACT_HWERR is defined */

/* if we want hardware error to be exact, we need to do a SSYNC (which forces
 * read/writes to complete to the memory controllers), and check to see that
 * caused a pending HW error condition. If so, we assume it was caused by user
 * space, by setting the same interrupt that we are in (so it goes off again)
 * and context restore, and a RTI (without servicing anything). This should
 * cause the pending HWERR to fire, and when that is done, this interrupt will
 * be re-serviced properly.
 * As you can see by the code - we actually need to do two SSYNCS - one to
 * make sure the read/writes complete, and another to make sure the hardware
 * error is recognized by the core.
 *
 * The extra nop before the SSYNC is to make sure we work around 05000244,
 * since the 283/315 workaround includes a branch to the end
 */
#define INTERRUPT_ENTRY(N)						\
    [--sp] = SYSCFG;							\
    [--sp] = P0;	/*orig_p0*/					\
    [--sp] = R0;	/*orig_r0*/					\
    [--sp] = (R7:0,P5:0);						\
    R1 = ASTAT;								\
    ANOMALY_283_315_WORKAROUND(p0, r0)					\
    P0.L = LO(ILAT);							\
    P0.H = HI(ILAT);							\
    NOP;								\
    SSYNC;								\
    SSYNC;								\
    R0 = [P0];								\
    CC = BITTST(R0, EVT_IVHW_P);					\
    IF CC JUMP 1f;							\
    ASTAT = R1;								\
    p0.l = lo(IPEND);							\
    p0.h = hi(IPEND);							\
    r1 = [p0];								\
    R0 = (N);								\
    LOAD_IPIPE_IPEND							\
    jump __common_int_entry;						\
1:  ASTAT = R1;								\
    RAISE N;								\
    (R7:0, P5:0) = [SP++];						\
    SP += 0x8;								\
    SYSCFG = [SP++];							\
    CSYNC;								\
    RTI;

#define TIMER_INTERRUPT_ENTRY(N)					\
    [--sp] = SYSCFG;							\
    [--sp] = P0;	/*orig_p0*/					\
    [--sp] = R0;	/*orig_r0*/					\
    [--sp] = (R7:0,P5:0);						\
    R1 = ASTAT;								\
    ANOMALY_283_315_WORKAROUND(p0, r0)					\
    P0.L = LO(ILAT);							\
    P0.H = HI(ILAT);							\
    NOP;								\
    SSYNC;								\
    SSYNC;								\
    R0 = [P0];								\
    CC = BITTST(R0, EVT_IVHW_P);					\
    IF CC JUMP 1f;							\
    ASTAT = R1;								\
    p0.l = lo(IPEND);							\
    p0.h = hi(IPEND);							\
    r1 = [p0];								\
    R0 = (N);								\
    jump __common_int_entry;						\
1:  ASTAT = R1;								\
    RAISE N;								\
    (R7:0, P5:0) = [SP++];						\
    SP += 0x8;								\
    SYSCFG = [SP++];							\
    CSYNC;								\
    RTI;
#endif	/* CONFIG_EXACT_HWERR */

/* This one pushes RETI without using CLI.  Interrupts are enabled.  */
#define SAVE_CONTEXT_SYSCALL	save_context_syscall
#define SAVE_CONTEXT		save_context_with_interrupts
#define SAVE_CONTEXT_CPLB	save_context_cplb

#define RESTORE_ALL_SYS		restore_context_no_interrupts
#define RESTORE_CONTEXT		restore_context_with_interrupts
#define RESTORE_CONTEXT_CPLB	restore_context_cplb

#endif				/* __ASSEMBLY__ */
#endif				/* __BFIN_ENTRY_H */
Commit	Line	Data
1394f032 BW	1	#ifndef __BFIN_ENTRY_H
	2	#define __BFIN_ENTRY_H
	3
	4	#include <asm/setup.h>
	5	#include <asm/page.h>
	6
	7	#ifdef __ASSEMBLY__
	8
	9	#define LFLUSH_I_AND_D 0x00000808
	10	#define LSIGTRAP 5
	11
	12	/* process bits for task_struct.flags */
	13	#define PF_TRACESYS_OFF 3
	14	#define PF_TRACESYS_BIT 5
	15	#define PF_PTRACED_OFF 3
	16	#define PF_PTRACED_BIT 4
	17	#define PF_DTRACE_OFF 1
	18	#define PF_DTRACE_BIT 5
	19
0893f125 BS	20	/*
	21	* NOTE! The single-stepping code assumes that all interrupt handlers
	22	* start by saving SYSCFG on the stack with their first instruction.
	23	*/
	24
1394f032 BW	25	/* This one is used for exceptions, emulation, and NMI. It doesn't push
	26	RETI and doesn't do cli. */
	27	#define SAVE_ALL_SYS save_context_no_interrupts
	28	/* This is used for all normal interrupts. It saves a minimum of registers
	29	to the stack, loads the IRQ number, and jumps to common code. */
6a01f230 YL	30	#ifdef CONFIG_IPIPE
	31	# define LOAD_IPIPE_IPEND \
	32	P0.l = lo(IPEND); \
	33	P0.h = hi(IPEND); \
	34	R1 = [P0];
	35	#else
	36	# define LOAD_IPIPE_IPEND
	37	#endif
b9a3899d	38
dedfd5d7 RG	39	/*
	40	* Workaround for anomalies 05000283 and 05000315
	41	*/
	42	#if ANOMALY_05000283 \|\| ANOMALY_05000315
	43	# define ANOMALY_283_315_WORKAROUND(preg, dreg) \
	44	cc = dreg == dreg; \
	45	preg.h = HI(CHIPID); \
	46	preg.l = LO(CHIPID); \
	47	if cc jump 1f; \
	48	dreg.l = W[preg]; \
	49	1:
	50	#else
	51	# define ANOMALY_283_315_WORKAROUND(preg, dreg)
	52	#endif /* ANOMALY_05000283 \|\| ANOMALY_05000315 */
	53
b9a3899d RG	54	#ifndef CONFIG_EXACT_HWERR
	55	/* As a debugging aid - we save IPEND when DEBUG_KERNEL is on,
	56	* otherwise it is a waste of cycles.
	57	*/
	58	# ifndef CONFIG_DEBUG_KERNEL
	59	#define INTERRUPT_ENTRY(N) \
	60	[--sp] = SYSCFG; \
	61	[--sp] = P0; /orig_p0/ \
	62	[--sp] = R0; /orig_r0/ \
	63	[--sp] = (R7:0,P5:0); \
	64	R0 = (N); \
	65	LOAD_IPIPE_IPEND \
	66	jump __common_int_entry;
	67	# else /* CONFIG_DEBUG_KERNEL */
1394f032 BW	68	#define INTERRUPT_ENTRY(N) \
1394f032 BW	69	[--sp] = SYSCFG; \
1394f032 BW	70	[--sp] = P0; /orig_p0/ \
	71	[--sp] = R0; /orig_r0/ \
	72	[--sp] = (R7:0,P5:0); \
b9a3899d RG	73	p0.l = lo(IPEND); \
	74	p0.h = hi(IPEND); \
	75	r1 = [p0]; \
1394f032	76	R0 = (N); \
6a01f230	77	LOAD_IPIPE_IPEND \
1394f032	78	jump __common_int_entry;
b9a3899d	79	# endif /* CONFIG_DEBUG_KERNEL */
1394f032 BW	80
1394f032 BW	81	/* For timer interrupts, we need to save IPEND, since the user_mode
b9a3899d RG	82	*macro accesses it to determine where to account time.
b9a3899d RG	83	*/
1394f032 BW	84	#define TIMER_INTERRUPT_ENTRY(N) \
1394f032 BW	85	[--sp] = SYSCFG; \
1394f032 BW	86	[--sp] = P0; /orig_p0/ \
	87	[--sp] = R0; /orig_r0/ \
	88	[--sp] = (R7:0,P5:0); \
	89	p0.l = lo(IPEND); \
	90	p0.h = hi(IPEND); \
	91	r1 = [p0]; \
	92	R0 = (N); \
	93	jump __common_int_entry;
b9a3899d RG	94	#else /* CONFIG_EXACT_HWERR is defined */
	95
	96	/* if we want hardware error to be exact, we need to do a SSYNC (which forces
	97	* read/writes to complete to the memory controllers), and check to see that
	98	* caused a pending HW error condition. If so, we assume it was caused by user
	99	* space, by setting the same interrupt that we are in (so it goes off again)
	100	* and context restore, and a RTI (without servicing anything). This should
	101	* cause the pending HWERR to fire, and when that is done, this interrupt will
	102	* be re-serviced properly.
	103	* As you can see by the code - we actually need to do two SSYNCS - one to
	104	* make sure the read/writes complete, and another to make sure the hardware
	105	* error is recognized by the core.
dedfd5d7 RG	106	*
	107	* The extra nop before the SSYNC is to make sure we work around 05000244,
	108	* since the 283/315 workaround includes a branch to the end
b9a3899d RG	109	*/
b9a3899d RG	110	#define INTERRUPT_ENTRY(N) \
b9a3899d RG	111	[--sp] = SYSCFG; \
	112	[--sp] = P0; /orig_p0/ \
	113	[--sp] = R0; /orig_r0/ \
	114	[--sp] = (R7:0,P5:0); \
	115	R1 = ASTAT; \
dedfd5d7	116	ANOMALY_283_315_WORKAROUND(p0, r0) \
b9a3899d RG	117	P0.L = LO(ILAT); \
b9a3899d RG	118	P0.H = HI(ILAT); \
dedfd5d7 RG	119	NOP; \
	120	SSYNC; \
	121	SSYNC; \
b9a3899d RG	122	R0 = [P0]; \
	123	CC = BITTST(R0, EVT_IVHW_P); \
	124	IF CC JUMP 1f; \
	125	ASTAT = R1; \
	126	p0.l = lo(IPEND); \
	127	p0.h = hi(IPEND); \
	128	r1 = [p0]; \
	129	R0 = (N); \
	130	LOAD_IPIPE_IPEND \
	131	jump __common_int_entry; \
	132	1: ASTAT = R1; \
	133	RAISE N; \
	134	(R7:0, P5:0) = [SP++]; \
	135	SP += 0x8; \
	136	SYSCFG = [SP++]; \
	137	CSYNC; \
	138	RTI;
	139
	140	#define TIMER_INTERRUPT_ENTRY(N) \
b9a3899d RG	141	[--sp] = SYSCFG; \
	142	[--sp] = P0; /orig_p0/ \
	143	[--sp] = R0; /orig_r0/ \
	144	[--sp] = (R7:0,P5:0); \
	145	R1 = ASTAT; \
dedfd5d7	146	ANOMALY_283_315_WORKAROUND(p0, r0) \
b9a3899d RG	147	P0.L = LO(ILAT); \
b9a3899d RG	148	P0.H = HI(ILAT); \
dedfd5d7 RG	149	NOP; \
	150	SSYNC; \
	151	SSYNC; \
b9a3899d RG	152	R0 = [P0]; \
	153	CC = BITTST(R0, EVT_IVHW_P); \
	154	IF CC JUMP 1f; \
	155	ASTAT = R1; \
	156	p0.l = lo(IPEND); \
	157	p0.h = hi(IPEND); \
	158	r1 = [p0]; \
	159	R0 = (N); \
	160	jump __common_int_entry; \
	161	1: ASTAT = R1; \
	162	RAISE N; \
	163	(R7:0, P5:0) = [SP++]; \
	164	SP += 0x8; \
	165	SYSCFG = [SP++]; \
	166	CSYNC; \
	167	RTI;
	168	#endif /* CONFIG_EXACT_HWERR */
1394f032 BW	169
	170	/* This one pushes RETI without using CLI. Interrupts are enabled. */
	171	#define SAVE_CONTEXT_SYSCALL save_context_syscall
	172	#define SAVE_CONTEXT save_context_with_interrupts
dbdf20db	173	#define SAVE_CONTEXT_CPLB save_context_cplb
1394f032 BW	174
	175	#define RESTORE_ALL_SYS restore_context_no_interrupts
	176	#define RESTORE_CONTEXT restore_context_with_interrupts
dbdf20db	177	#define RESTORE_CONTEXT_CPLB restore_context_cplb
1394f032 BW	178
	179	#endif /* __ASSEMBLY__ */
	180	#endif /* __BFIN_ENTRY_H */