1/*
 2 * IRQ flags handling
 3 */
 4#ifndef _ASM_IRQFLAGS_H
 5#define _ASM_IRQFLAGS_H
 6
 7#ifndef __ASSEMBLY__
 8/*
 9 * Get definitions for arch_local_save_flags(x), etc.
10 */
11#include <asm/hw_irq.h>
12
13#else
14#ifdef CONFIG_TRACE_IRQFLAGS
15#ifdef CONFIG_IRQSOFF_TRACER
16/*
17 * Since the ftrace irqsoff latency trace checks CALLER_ADDR1,
18 * which is the stack frame here, we need to force a stack frame
19 * in case we came from user space.
20 */
21#define TRACE_WITH_FRAME_BUFFER(func)		\
22	mflr	r0;				\
23	stdu	r1, -STACK_FRAME_OVERHEAD(r1);	\
24	std	r0, 16(r1);			\
25	stdu	r1, -STACK_FRAME_OVERHEAD(r1);	\
26	bl func;				\
27	ld	r1, 0(r1);			\
28	ld	r1, 0(r1);
29#else
30#define TRACE_WITH_FRAME_BUFFER(func)		\
31	bl func;
32#endif
33
34/*
35 * These are calls to C code, so the caller must be prepared for volatiles to
36 * be clobbered.
 
37 */
38#define TRACE_ENABLE_INTS	TRACE_WITH_FRAME_BUFFER(trace_hardirqs_on)
39#define TRACE_DISABLE_INTS	TRACE_WITH_FRAME_BUFFER(trace_hardirqs_off)
40
41/*
42 * This is used by assembly code to soft-disable interrupts first and
43 * reconcile irq state.
44 *
45 * NB: This may call C code, so the caller must be prepared for volatiles to
46 * be clobbered.
47 */
48#define RECONCILE_IRQ_STATE(__rA, __rB)		\
49	lbz	__rA,PACASOFTIRQEN(r13);	\
50	lbz	__rB,PACAIRQHAPPENED(r13);	\
51	cmpwi	cr0,__rA,0;			\
52	li	__rA,0;				\
53	ori	__rB,__rB,PACA_IRQ_HARD_DIS;	\
54	stb	__rB,PACAIRQHAPPENED(r13);	\
55	beq	44f;				\
56	stb	__rA,PACASOFTIRQEN(r13);	\
57	TRACE_DISABLE_INTS;			\
5844:
59
 
 
 
 
 
 
 
 
 
 
 
 
60#else
61#define TRACE_ENABLE_INTS
62#define TRACE_DISABLE_INTS
63
64#define RECONCILE_IRQ_STATE(__rA, __rB)		\
65	lbz	__rA,PACAIRQHAPPENED(r13);	\
66	li	__rB,0;				\
67	ori	__rA,__rA,PACA_IRQ_HARD_DIS;	\
68	stb	__rB,PACASOFTIRQEN(r13);	\
69	stb	__rA,PACAIRQHAPPENED(r13)
70#endif
71#endif
72
73#endif

 1/*
 2 * IRQ flags handling
 3 */
 4#ifndef _ASM_IRQFLAGS_H
 5#define _ASM_IRQFLAGS_H
 6
 7#ifndef __ASSEMBLY__
 8/*
 9 * Get definitions for arch_local_save_flags(x), etc.
10 */
11#include <asm/hw_irq.h>
12
13#else
14#ifdef CONFIG_TRACE_IRQFLAGS
15#ifdef CONFIG_IRQSOFF_TRACER
16/*
17 * Since the ftrace irqsoff latency trace checks CALLER_ADDR1,
18 * which is the stack frame here, we need to force a stack frame
19 * in case we came from user space.
20 */
21#define TRACE_WITH_FRAME_BUFFER(func)		\
22	mflr	r0;				\
23	stdu	r1, -32(r1);			\
24	std	r0, 16(r1);			\
25	stdu	r1, -32(r1);			\
26	bl func;				\
27	ld	r1, 0(r1);			\
28	ld	r1, 0(r1);
29#else
30#define TRACE_WITH_FRAME_BUFFER(func)		\
31	bl func;
32#endif
33
34/*
35 * Most of the CPU's IRQ-state tracing is done from assembly code; we
36 * have to call a C function so call a wrapper that saves all the
37 * C-clobbered registers.
38 */
39#define TRACE_ENABLE_INTS	TRACE_WITH_FRAME_BUFFER(.trace_hardirqs_on)
40#define TRACE_DISABLE_INTS	TRACE_WITH_FRAME_BUFFER(.trace_hardirqs_off)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
41
42#define TRACE_AND_RESTORE_IRQ_PARTIAL(en,skip)		\
43	cmpdi	en,0;					\
44	bne	95f;					\
45	stb	en,PACASOFTIRQEN(r13);			\
46	TRACE_WITH_FRAME_BUFFER(.trace_hardirqs_off)	\
47	b	skip;					\
4895:	TRACE_WITH_FRAME_BUFFER(.trace_hardirqs_on)	\
49	li	en,1;
50#define TRACE_AND_RESTORE_IRQ(en)		\
51	TRACE_AND_RESTORE_IRQ_PARTIAL(en,96f);	\
52	stb	en,PACASOFTIRQEN(r13);		\
5396:
54#else
55#define TRACE_ENABLE_INTS
56#define TRACE_DISABLE_INTS
57#define TRACE_AND_RESTORE_IRQ_PARTIAL(en,skip)
58#define TRACE_AND_RESTORE_IRQ(en)		\
59	stb	en,PACASOFTIRQEN(r13)
 
 
 
 
60#endif
61#endif
62
63#endif