MIPS: Move headfiles to new location below arch/mips/include

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 271 insertions, 0 deletions

diff --git a/arch/mips/include/asm/hazards.h b/arch/mips/include/asm/hazards.h
new file mode 100644
index 000000000000..2de638f84c86
--- /dev/null
+++ b/arch/mips/include/asm/hazards.h
@@ -0,0 +1,271 @@
+/*
+ * 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) 2003, 04, 07 Ralf Baechle <ralf@linux-mips.org>
+ * Copyright (C) MIPS Technologies, Inc.
+ *   written by Ralf Baechle <ralf@linux-mips.org>
+ */
+#ifndef _ASM_HAZARDS_H
+#define _ASM_HAZARDS_H
+
+#ifdef __ASSEMBLY__
+#define ASMMACRO(name, code...) .macro name; code; .endm
+#else
+
+#include <asm/cpu-features.h>
+
+#define ASMMACRO(name, code...)						\
+__asm__(".macro " #name "; " #code "; .endm");				\
+									\
+static inline void name(void)						\
+{									\
+	__asm__ __volatile__ (#name);					\
+}
+
+/*
+ * MIPS R2 instruction hazard barrier.   Needs to be called as a subroutine.
+ */
+extern void mips_ihb(void);
+
+#endif
+
+ASMMACRO(_ssnop,
+	 sll	$0, $0, 1
+	)
+
+ASMMACRO(_ehb,
+	 sll	$0, $0, 3
+	)
+
+/*
+ * TLB hazards
+ */
+#if defined(CONFIG_CPU_MIPSR2)
+
+/*
+ * MIPSR2 defines ehb for hazard avoidance
+ */
+
+ASMMACRO(mtc0_tlbw_hazard,
+	 _ehb
+	)
+ASMMACRO(tlbw_use_hazard,
+	 _ehb
+	)
+ASMMACRO(tlb_probe_hazard,
+	 _ehb
+	)
+ASMMACRO(irq_enable_hazard,
+	 _ehb
+	)
+ASMMACRO(irq_disable_hazard,
+	_ehb
+	)
+ASMMACRO(back_to_back_c0_hazard,
+	 _ehb
+	)
+/*
+ * gcc has a tradition of misscompiling the previous construct using the
+ * address of a label as argument to inline assembler.  Gas otoh has the
+ * annoying difference between la and dla which are only usable for 32-bit
+ * rsp. 64-bit code, so can't be used without conditional compilation.
+ * The alterantive is switching the assembler to 64-bit code which happens
+ * to work right even for 32-bit code ...
+ */
+#define instruction_hazard()						\
+do {									\
+	unsigned long tmp;						\
+									\
+	__asm__ __volatile__(						\
+	"	.set	mips64r2				\n"	\
+	"	dla	%0, 1f					\n"	\
+	"	jr.hb	%0					\n"	\
+	"	.set	mips0					\n"	\
+	"1:							\n"	\
+	: "=r" (tmp));							\
+} while (0)
+
+#elif defined(CONFIG_CPU_MIPSR1)
+
+/*
+ * These are slightly complicated by the fact that we guarantee R1 kernels to
+ * run fine on R2 processors.
+ */
+ASMMACRO(mtc0_tlbw_hazard,
+	_ssnop; _ssnop; _ehb
+	)
+ASMMACRO(tlbw_use_hazard,
+	_ssnop; _ssnop; _ssnop; _ehb
+	)
+ASMMACRO(tlb_probe_hazard,
+	 _ssnop; _ssnop; _ssnop; _ehb
+	)
+ASMMACRO(irq_enable_hazard,
+	 _ssnop; _ssnop; _ssnop; _ehb
+	)
+ASMMACRO(irq_disable_hazard,
+	_ssnop; _ssnop; _ssnop; _ehb
+	)
+ASMMACRO(back_to_back_c0_hazard,
+	 _ssnop; _ssnop; _ssnop; _ehb
+	)
+/*
+ * gcc has a tradition of misscompiling the previous construct using the
+ * address of a label as argument to inline assembler.  Gas otoh has the
+ * annoying difference between la and dla which are only usable for 32-bit
+ * rsp. 64-bit code, so can't be used without conditional compilation.
+ * The alterantive is switching the assembler to 64-bit code which happens
+ * to work right even for 32-bit code ...
+ */
+#define __instruction_hazard()						\
+do {									\
+	unsigned long tmp;						\
+									\
+	__asm__ __volatile__(						\
+	"	.set	mips64r2				\n"	\
+	"	dla	%0, 1f					\n"	\
+	"	jr.hb	%0					\n"	\
+	"	.set	mips0					\n"	\
+	"1:							\n"	\
+	: "=r" (tmp));							\
+} while (0)
+
+#define instruction_hazard()						\
+do {									\
+	if (cpu_has_mips_r2)						\
+		__instruction_hazard();					\
+} while (0)
+
+#elif defined(CONFIG_CPU_R10000)
+
+/*
+ * R10000 rocks - all hazards handled in hardware, so this becomes a nobrainer.
+ */
+
+ASMMACRO(mtc0_tlbw_hazard,
+	)
+ASMMACRO(tlbw_use_hazard,
+	)
+ASMMACRO(tlb_probe_hazard,
+	)
+ASMMACRO(irq_enable_hazard,
+	)
+ASMMACRO(irq_disable_hazard,
+	)
+ASMMACRO(back_to_back_c0_hazard,
+	)
+#define instruction_hazard() do { } while (0)
+
+#elif defined(CONFIG_CPU_RM9000)
+
+/*
+ * RM9000 hazards.  When the JTLB is updated by tlbwi or tlbwr, a subsequent
+ * use of the JTLB for instructions should not occur for 4 cpu cycles and use
+ * for data translations should not occur for 3 cpu cycles.
+ */
+
+ASMMACRO(mtc0_tlbw_hazard,
+	 _ssnop; _ssnop; _ssnop; _ssnop
+	)
+ASMMACRO(tlbw_use_hazard,
+	 _ssnop; _ssnop; _ssnop; _ssnop
+	)
+ASMMACRO(tlb_probe_hazard,
+	 _ssnop; _ssnop; _ssnop; _ssnop
+	)
+ASMMACRO(irq_enable_hazard,
+	)
+ASMMACRO(irq_disable_hazard,
+	)
+ASMMACRO(back_to_back_c0_hazard,
+	)
+#define instruction_hazard() do { } while (0)
+
+#elif defined(CONFIG_CPU_SB1)
+
+/*
+ * Mostly like R4000 for historic reasons
+ */
+ASMMACRO(mtc0_tlbw_hazard,
+	)
+ASMMACRO(tlbw_use_hazard,
+	)
+ASMMACRO(tlb_probe_hazard,
+	)
+ASMMACRO(irq_enable_hazard,
+	)
+ASMMACRO(irq_disable_hazard,
+	 _ssnop; _ssnop; _ssnop
+	)
+ASMMACRO(back_to_back_c0_hazard,
+	)
+#define instruction_hazard() do { } while (0)
+
+#else
+
+/*
+ * Finally the catchall case for all other processors including R4000, R4400,
+ * R4600, R4700, R5000, RM7000, NEC VR41xx etc.
+ *
+ * The taken branch will result in a two cycle penalty for the two killed
+ * instructions on R4000 / R4400.  Other processors only have a single cycle
+ * hazard so this is nice trick to have an optimal code for a range of
+ * processors.
+ */
+ASMMACRO(mtc0_tlbw_hazard,
+	nop; nop
+	)
+ASMMACRO(tlbw_use_hazard,
+	nop; nop; nop
+	)
+ASMMACRO(tlb_probe_hazard,
+	 nop; nop; nop
+	)
+ASMMACRO(irq_enable_hazard,
+	 _ssnop; _ssnop; _ssnop;
+	)
+ASMMACRO(irq_disable_hazard,
+	nop; nop; nop
+	)
+ASMMACRO(back_to_back_c0_hazard,
+	 _ssnop; _ssnop; _ssnop;
+	)
+#define instruction_hazard() do { } while (0)
+
+#endif
+
+
+/* FPU hazards */
+
+#if defined(CONFIG_CPU_SB1)
+ASMMACRO(enable_fpu_hazard,
+	 .set	push;
+	 .set	mips64;
+	 .set	noreorder;
+	 _ssnop;
+	 bnezl	$0, .+4;
+	 _ssnop;
+	 .set	pop
+)
+ASMMACRO(disable_fpu_hazard,
+)
+
+#elif defined(CONFIG_CPU_MIPSR2)
+ASMMACRO(enable_fpu_hazard,
+	 _ehb
+)
+ASMMACRO(disable_fpu_hazard,
+	 _ehb
+)
+#else
+ASMMACRO(enable_fpu_hazard,
+	 nop; nop; nop; nop
+)
+ASMMACRO(disable_fpu_hazard,
+	 _ehb
+)
+#endif
+
+#endif /* _ASM_HAZARDS_H */