mirror of
https://github.com/torvalds/linux.git
synced 2024-10-31 09:11:49 +00:00
264 lines
6.2 KiB
C
264 lines
6.2 KiB
C
/*
|
|
* 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");
|
|
|
|
static inline void raw_local_irq_enable(void)
|
|
{
|
|
__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");
|
|
|
|
extern void smtc_ipi_replay(void);
|
|
|
|
static inline void raw_local_irq_restore(unsigned long flags)
|
|
{
|
|
unsigned long __tmp1;
|
|
|
|
#ifdef CONFIG_MIPS_MT_SMTC_INSTANT_REPLAY
|
|
/*
|
|
* CONFIG_MIPS_MT_SMTC_INSTANT_REPLAY does prompt replay of deferred
|
|
* 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 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 */
|