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-rw-r--r--arch/mips/include/asm/irqflags.h283
1 files changed, 283 insertions, 0 deletions
diff --git a/arch/mips/include/asm/irqflags.h b/arch/mips/include/asm/irqflags.h
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+++ b/arch/mips/include/asm/irqflags.h
@@ -0,0 +1,283 @@
+/*
+ * 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 */
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