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+/*
+ * 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 */