[deliverable/linux.git] / include / asm-mips / irqflags.h

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle
 * Copyright (C) 1996 by Paul M. Antoine
 * Copyright (C) 1999 Silicon Graphics
 * Copyright (C) 2000 MIPS Technologies, Inc.
 */
#ifndef _ASM_IRQFLAGS_H
#define _ASM_IRQFLAGS_H

#ifndef __ASSEMBLY__

#include <linux/compiler.h>
#include <asm/hazards.h>

__asm__(
	"	.macro	raw_local_irq_enable				\n"
	"	.set	push						\n"
	"	.set	reorder						\n"
	"	.set	noat						\n"
#ifdef CONFIG_MIPS_MT_SMTC
	"	mfc0	$1, $2, 1	# SMTC - clear TCStatus.IXMT	\n"
	"	ori	$1, 0x400					\n"
	"	xori	$1, 0x400					\n"
	"	mtc0	$1, $2, 1					\n"
#elif defined(CONFIG_CPU_MIPSR2)
	"	ei							\n"
#else
	"	mfc0	$1,$12						\n"
	"	ori	$1,0x1f						\n"
	"	xori	$1,0x1e						\n"
	"	mtc0	$1,$12						\n"
#endif
	"	irq_enable_hazard					\n"
	"	.set	pop						\n"
	"	.endm");

extern void smtc_ipi_replay(void);

static inline void raw_local_irq_enable(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
	/*
	 * SMTC kernel needs to do a software replay of queued
	 * IPIs, at the cost of call overhead on each local_irq_enable()
	 */
	smtc_ipi_replay();
#endif
	__asm__ __volatile__(
		"raw_local_irq_enable"
		: /* no outputs */
		: /* no inputs */
		: "memory");
}


/*
 * For cli() we have to insert nops to make sure that the new value
 * has actually arrived in the status register before the end of this
 * macro.
 * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
 * no nops at all.
 */
/*
 * For TX49, operating only IE bit is not enough.
 *
 * If mfc0 $12 follows store and the mfc0 is last instruction of a
 * page and fetching the next instruction causes TLB miss, the result
 * of the mfc0 might wrongly contain EXL bit.
 *
 * ERT-TX49H2-027, ERT-TX49H3-012, ERT-TX49HL3-006, ERT-TX49H4-008
 *
 * Workaround: mask EXL bit of the result or place a nop before mfc0.
 */
__asm__(
	"	.macro	raw_local_irq_disable\n"
	"	.set	push						\n"
	"	.set	noat						\n"
#ifdef CONFIG_MIPS_MT_SMTC
	"	mfc0	$1, $2, 1					\n"
	"	ori	$1, 0x400					\n"
	"	.set	noreorder					\n"
	"	mtc0	$1, $2, 1					\n"
#elif defined(CONFIG_CPU_MIPSR2)
	"	di							\n"
#else
	"	mfc0	$1,$12						\n"
	"	ori	$1,0x1f						\n"
	"	xori	$1,0x1f						\n"
	"	.set	noreorder					\n"
	"	mtc0	$1,$12						\n"
#endif
	"	irq_disable_hazard					\n"
	"	.set	pop						\n"
	"	.endm							\n");

static inline void raw_local_irq_disable(void)
{
	__asm__ __volatile__(
		"raw_local_irq_disable"
		: /* no outputs */
		: /* no inputs */
		: "memory");
}

__asm__(
	"	.macro	raw_local_save_flags flags			\n"
	"	.set	push						\n"
	"	.set	reorder						\n"
#ifdef CONFIG_MIPS_MT_SMTC
	"	mfc0	\\flags, $2, 1					\n"
#else
	"	mfc0	\\flags, $12					\n"
#endif
	"	.set	pop						\n"
	"	.endm							\n");

#define raw_local_save_flags(x)						\
__asm__ __volatile__(							\
	"raw_local_save_flags %0"					\
	: "=r" (x))

__asm__(
	"	.macro	raw_local_irq_save result			\n"
	"	.set	push						\n"
	"	.set	reorder						\n"
	"	.set	noat						\n"
#ifdef CONFIG_MIPS_MT_SMTC
	"	mfc0	\\result, $2, 1					\n"
	"	ori	$1, \\result, 0x400				\n"
	"	.set	noreorder					\n"
	"	mtc0	$1, $2, 1					\n"
	"	andi	\\result, \\result, 0x400			\n"
#elif defined(CONFIG_CPU_MIPSR2)
	"	di	\\result					\n"
	"	andi	\\result, 1					\n"
#else
	"	mfc0	\\result, $12					\n"
	"	ori	$1, \\result, 0x1f				\n"
	"	xori	$1, 0x1f					\n"
	"	.set	noreorder					\n"
	"	mtc0	$1, $12						\n"
#endif
	"	irq_disable_hazard					\n"
	"	.set	pop						\n"
	"	.endm							\n");

#define raw_local_irq_save(x)						\
__asm__ __volatile__(							\
	"raw_local_irq_save\t%0"					\
	: "=r" (x)							\
	: /* no inputs */						\
	: "memory")

__asm__(
	"	.macro	raw_local_irq_restore flags			\n"
	"	.set	push						\n"
	"	.set	noreorder					\n"
	"	.set	noat						\n"
#ifdef CONFIG_MIPS_MT_SMTC
	"mfc0	$1, $2, 1						\n"
	"andi	\\flags, 0x400						\n"
	"ori	$1, 0x400						\n"
	"xori	$1, 0x400						\n"
	"or	\\flags, $1						\n"
	"mtc0	\\flags, $2, 1						\n"
#elif defined(CONFIG_CPU_MIPSR2) && defined(CONFIG_IRQ_CPU)
	/*
	 * Slow, but doesn't suffer from a relativly unlikely race
	 * condition we're having since days 1.
	 */
	"	beqz	\\flags, 1f					\n"
	"	 di							\n"
	"	ei							\n"
	"1:								\n"
#elif defined(CONFIG_CPU_MIPSR2)
	/*
	 * Fast, dangerous.  Life is fun, life is good.
	 */
	"	mfc0	$1, $12						\n"
	"	ins	$1, \\flags, 0, 1				\n"
	"	mtc0	$1, $12						\n"
#else
	"	mfc0	$1, $12						\n"
	"	andi	\\flags, 1					\n"
	"	ori	$1, 0x1f					\n"
	"	xori	$1, 0x1f					\n"
	"	or	\\flags, $1					\n"
	"	mtc0	\\flags, $12					\n"
#endif
	"	irq_disable_hazard					\n"
	"	.set	pop						\n"
	"	.endm							\n");


static inline void raw_local_irq_restore(unsigned long flags)
{
	unsigned long __tmp1;

#ifdef CONFIG_MIPS_MT_SMTC
	/*
	 * SMTC kernel needs to do a software replay of queued
	 * IPIs, at the cost of branch and call overhead on each
	 * local_irq_restore()
	 */
	if (unlikely(!(flags & 0x0400)))
		smtc_ipi_replay();
#endif

	__asm__ __volatile__(
		"raw_local_irq_restore\t%0"
		: "=r" (__tmp1)
		: "0" (flags)
		: "memory");
}

static inline void __raw_local_irq_restore(unsigned long flags)
{
	unsigned long __tmp1;

	__asm__ __volatile__(
		"raw_local_irq_restore\t%0"
		: "=r" (__tmp1)
		: "0" (flags)
		: "memory");
}

static inline int raw_irqs_disabled_flags(unsigned long flags)
{
#ifdef CONFIG_MIPS_MT_SMTC
	/*
	 * SMTC model uses TCStatus.IXMT to disable interrupts for a thread/CPU
	 */
	return flags & 0x400;
#else
	return !(flags & 1);
#endif
}

#endif

/*
 * Do the CPU's IRQ-state tracing from assembly code.
 */
#ifdef CONFIG_TRACE_IRQFLAGS
/* Reload some registers clobbered by trace_hardirqs_on */
#ifdef CONFIG_64BIT
# define TRACE_IRQS_RELOAD_REGS						\
	LONG_L	$11, PT_R11(sp);					\
	LONG_L	$10, PT_R10(sp);					\
	LONG_L	$9, PT_R9(sp);						\
	LONG_L	$8, PT_R8(sp);						\
	LONG_L	$7, PT_R7(sp);						\
	LONG_L	$6, PT_R6(sp);						\
	LONG_L	$5, PT_R5(sp);						\
	LONG_L	$4, PT_R4(sp);						\
	LONG_L	$2, PT_R2(sp)
#else
# define TRACE_IRQS_RELOAD_REGS						\
	LONG_L	$7, PT_R7(sp);						\
	LONG_L	$6, PT_R6(sp);						\
	LONG_L	$5, PT_R5(sp);						\
	LONG_L	$4, PT_R4(sp);						\
	LONG_L	$2, PT_R2(sp)
#endif
# define TRACE_IRQS_ON							\
	CLI;	/* make sure trace_hardirqs_on() is called in kernel level */ \
	jal	trace_hardirqs_on
# define TRACE_IRQS_ON_RELOAD						\
	TRACE_IRQS_ON;							\
	TRACE_IRQS_RELOAD_REGS
# define TRACE_IRQS_OFF							\
	jal	trace_hardirqs_off
#else
# define TRACE_IRQS_ON
# define TRACE_IRQS_ON_RELOAD
# define TRACE_IRQS_OFF
#endif

#endif /* _ASM_IRQFLAGS_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle
	7	* Copyright (C) 1996 by Paul M. Antoine
	8	* Copyright (C) 1999 Silicon Graphics
	9	* Copyright (C) 2000 MIPS Technologies, Inc.
	10	*/
192ef366 RB	11	#ifndef _ASM_IRQFLAGS_H
	12	#define _ASM_IRQFLAGS_H
	13
	14	#ifndef __ASSEMBLY__
1da177e4	15
8a1e97ee	16	#include <linux/compiler.h>
1da177e4 LT	17	#include <asm/hazards.h>
1da177e4 LT	18
49a89efb	19	__asm__(
192ef366	20	" .macro raw_local_irq_enable \n"
ff88f8a3 RB	21	" .set push \n"
	22	" .set reorder \n"
	23	" .set noat \n"
41c594ab RB	24	#ifdef CONFIG_MIPS_MT_SMTC
	25	" mfc0 $1, $2, 1 # SMTC - clear TCStatus.IXMT \n"
	26	" ori $1, 0x400 \n"
	27	" xori $1, 0x400 \n"
	28	" mtc0 $1, $2, 1 \n"
	29	#elif defined(CONFIG_CPU_MIPSR2)
ff88f8a3 RB	30	" ei \n"
	31	#else
	32	" mfc0 $1,$12 \n"
	33	" ori $1,0x1f \n"
	34	" xori $1,0x1e \n"
	35	" mtc0 $1,$12 \n"
	36	#endif
	37	" irq_enable_hazard \n"
	38	" .set pop \n"
	39	" .endm");
1da177e4	40
8531a35e KK	41	extern void smtc_ipi_replay(void);
8531a35e KK	42
192ef366	43	static inline void raw_local_irq_enable(void)
1da177e4	44	{
8531a35e KK	45	#ifdef CONFIG_MIPS_MT_SMTC
	46	/*
	47	* SMTC kernel needs to do a software replay of queued
	48	* IPIs, at the cost of call overhead on each local_irq_enable()
	49	*/
	50	smtc_ipi_replay();
	51	#endif
1da177e4	52	__asm__ __volatile__(
192ef366	53	"raw_local_irq_enable"
1da177e4 LT	54	: /* no outputs */
	55	: /* no inputs */
	56	: "memory");
	57	}
	58
8531a35e	59
1da177e4 LT	60	/*
	61	* For cli() we have to insert nops to make sure that the new value
	62	* has actually arrived in the status register before the end of this
	63	* macro.
	64	* R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
	65	* no nops at all.
	66	*/
c226f260 AN	67	/*
	68	* For TX49, operating only IE bit is not enough.
	69	*
	70	* If mfc0 $12 follows store and the mfc0 is last instruction of a
	71	* page and fetching the next instruction causes TLB miss, the result
	72	* of the mfc0 might wrongly contain EXL bit.
	73	*
	74	* ERT-TX49H2-027, ERT-TX49H3-012, ERT-TX49HL3-006, ERT-TX49H4-008
	75	*
	76	* Workaround: mask EXL bit of the result or place a nop before mfc0.
	77	*/
49a89efb	78	__asm__(
192ef366	79	" .macro raw_local_irq_disable\n"
ff88f8a3 RB	80	" .set push \n"
ff88f8a3 RB	81	" .set noat \n"
41c594ab RB	82	#ifdef CONFIG_MIPS_MT_SMTC
	83	" mfc0 $1, $2, 1 \n"
	84	" ori $1, 0x400 \n"
	85	" .set noreorder \n"
	86	" mtc0 $1, $2, 1 \n"
	87	#elif defined(CONFIG_CPU_MIPSR2)
ff88f8a3 RB	88	" di \n"
	89	#else
	90	" mfc0 $1,$12 \n"
c226f260 AN	91	" ori $1,0x1f \n"
c226f260 AN	92	" xori $1,0x1f \n"
ff88f8a3 RB	93	" .set noreorder \n"
	94	" mtc0 $1,$12 \n"
	95	#endif
	96	" irq_disable_hazard \n"
	97	" .set pop \n"
	98	" .endm \n");
1da177e4	99
192ef366	100	static inline void raw_local_irq_disable(void)
1da177e4 LT	101	{
1da177e4 LT	102	__asm__ __volatile__(
192ef366	103	"raw_local_irq_disable"
1da177e4 LT	104	: /* no outputs */
	105	: /* no inputs */
	106	: "memory");
	107	}
	108
49a89efb	109	__asm__(
192ef366	110	" .macro raw_local_save_flags flags \n"
ff88f8a3 RB	111	" .set push \n"
ff88f8a3 RB	112	" .set reorder \n"
41c594ab RB	113	#ifdef CONFIG_MIPS_MT_SMTC
	114	" mfc0 \\flags, $2, 1 \n"
	115	#else
ff88f8a3	116	" mfc0 \\flags, $12 \n"
41c594ab	117	#endif
ff88f8a3 RB	118	" .set pop \n"
ff88f8a3 RB	119	" .endm \n");
1da177e4	120
192ef366	121	#define raw_local_save_flags(x) \
1da177e4	122	__asm__ __volatile__( \
192ef366	123	"raw_local_save_flags %0" \
1da177e4 LT	124	: "=r" (x))
1da177e4 LT	125
49a89efb	126	__asm__(
192ef366	127	" .macro raw_local_irq_save result \n"
ff88f8a3 RB	128	" .set push \n"
	129	" .set reorder \n"
	130	" .set noat \n"
41c594ab RB	131	#ifdef CONFIG_MIPS_MT_SMTC
	132	" mfc0 \\result, $2, 1 \n"
	133	" ori $1, \\result, 0x400 \n"
	134	" .set noreorder \n"
	135	" mtc0 $1, $2, 1 \n"
	136	" andi \\result, \\result, 0x400 \n"
	137	#elif defined(CONFIG_CPU_MIPSR2)
ff88f8a3	138	" di \\result \n"
15265251	139	" andi \\result, 1 \n"
ff88f8a3 RB	140	#else
ff88f8a3 RB	141	" mfc0 \\result, $12 \n"
c226f260 AN	142	" ori $1, \\result, 0x1f \n"
c226f260 AN	143	" xori $1, 0x1f \n"
ff88f8a3 RB	144	" .set noreorder \n"
	145	" mtc0 $1, $12 \n"
	146	#endif
	147	" irq_disable_hazard \n"
	148	" .set pop \n"
	149	" .endm \n");
1da177e4	150
192ef366	151	#define raw_local_irq_save(x) \
1da177e4	152	__asm__ __volatile__( \
192ef366	153	"raw_local_irq_save\t%0" \
1da177e4 LT	154	: "=r" (x) \
	155	: /* no inputs */ \
	156	: "memory")
	157
49a89efb	158	__asm__(
192ef366	159	" .macro raw_local_irq_restore flags \n"
2e66fe24	160	" .set push \n"
ff88f8a3 RB	161	" .set noreorder \n"
ff88f8a3 RB	162	" .set noat \n"
41c594ab RB	163	#ifdef CONFIG_MIPS_MT_SMTC
	164	"mfc0 $1, $2, 1 \n"
	165	"andi \\flags, 0x400 \n"
	166	"ori $1, 0x400 \n"
	167	"xori $1, 0x400 \n"
	168	"or \\flags, $1 \n"
	169	"mtc0 \\flags, $2, 1 \n"
	170	#elif defined(CONFIG_CPU_MIPSR2) && defined(CONFIG_IRQ_CPU)
ff88f8a3 RB	171	/*
	172	* Slow, but doesn't suffer from a relativly unlikely race
	173	* condition we're having since days 1.
	174	*/
	175	" beqz \\flags, 1f \n"
	176	" di \n"
	177	" ei \n"
	178	"1: \n"
ec917c2c	179	#elif defined(CONFIG_CPU_MIPSR2)
ff88f8a3 RB	180	/*
	181	* Fast, dangerous. Life is fun, life is good.
	182	*/
	183	" mfc0 $1, $12 \n"
	184	" ins $1, \\flags, 0, 1 \n"
	185	" mtc0 $1, $12 \n"
	186	#else
	187	" mfc0 $1, $12 \n"
	188	" andi \\flags, 1 \n"
c226f260 AN	189	" ori $1, 0x1f \n"
c226f260 AN	190	" xori $1, 0x1f \n"
ff88f8a3 RB	191	" or \\flags, $1 \n"
	192	" mtc0 \\flags, $12 \n"
	193	#endif
	194	" irq_disable_hazard \n"
2e66fe24	195	" .set pop \n"
ff88f8a3	196	" .endm \n");
1da177e4	197
8a1e97ee RB	198
	199	static inline void raw_local_irq_restore(unsigned long flags)
	200	{
	201	unsigned long __tmp1;
	202
8531a35e	203	#ifdef CONFIG_MIPS_MT_SMTC
8a1e97ee	204	/*
8531a35e	205	* SMTC kernel needs to do a software replay of queued
8a1e97ee RB	206	* IPIs, at the cost of branch and call overhead on each
	207	* local_irq_restore()
	208	*/
	209	if (unlikely(!(flags & 0x0400)))
	210	smtc_ipi_replay();
	211	#endif
	212
	213	__asm__ __volatile__(
	214	"raw_local_irq_restore\t%0"
	215	: "=r" (__tmp1)
	216	: "0" (flags)
	217	: "memory");
	218	}
1da177e4	219
8531a35e KK	220	static inline void __raw_local_irq_restore(unsigned long flags)
	221	{
	222	unsigned long __tmp1;
	223
	224	__asm__ __volatile__(
	225	"raw_local_irq_restore\t%0"
	226	: "=r" (__tmp1)
	227	: "0" (flags)
	228	: "memory");
	229	}
	230
192ef366	231	static inline int raw_irqs_disabled_flags(unsigned long flags)
41c594ab RB	232	{
	233	#ifdef CONFIG_MIPS_MT_SMTC
	234	/*
	235	* SMTC model uses TCStatus.IXMT to disable interrupts for a thread/CPU
	236	*/
192ef366	237	return flags & 0x400;
41c594ab	238	#else
41c594ab RB	239	return !(flags & 1);
	240	#endif
	241	}
1da177e4	242
192ef366 RB	243	#endif
	244
	245	/*
	246	* Do the CPU's IRQ-state tracing from assembly code.
	247	*/
	248	#ifdef CONFIG_TRACE_IRQFLAGS
eae6c0da AN	249	/* Reload some registers clobbered by trace_hardirqs_on */
	250	#ifdef CONFIG_64BIT
	251	# define TRACE_IRQS_RELOAD_REGS \
	252	LONG_L $11, PT_R11(sp); \
	253	LONG_L $10, PT_R10(sp); \
	254	LONG_L $9, PT_R9(sp); \
	255	LONG_L $8, PT_R8(sp); \
	256	LONG_L $7, PT_R7(sp); \
	257	LONG_L $6, PT_R6(sp); \
	258	LONG_L $5, PT_R5(sp); \
	259	LONG_L $4, PT_R4(sp); \
	260	LONG_L $2, PT_R2(sp)
	261	#else
	262	# define TRACE_IRQS_RELOAD_REGS \
	263	LONG_L $7, PT_R7(sp); \
	264	LONG_L $6, PT_R6(sp); \
	265	LONG_L $5, PT_R5(sp); \
	266	LONG_L $4, PT_R4(sp); \
	267	LONG_L $2, PT_R2(sp)
	268	#endif
192ef366	269	# define TRACE_IRQS_ON \
eae6c0da	270	CLI; /* make sure trace_hardirqs_on() is called in kernel level */ \
192ef366	271	jal trace_hardirqs_on
eae6c0da AN	272	# define TRACE_IRQS_ON_RELOAD \
	273	TRACE_IRQS_ON; \
	274	TRACE_IRQS_RELOAD_REGS
192ef366 RB	275	# define TRACE_IRQS_OFF \
	276	jal trace_hardirqs_off
	277	#else
	278	# define TRACE_IRQS_ON
eae6c0da	279	# define TRACE_IRQS_ON_RELOAD
192ef366 RB	280	# define TRACE_IRQS_OFF
	281	#endif
	282
	283	#endif /* _ASM_IRQFLAGS_H */