diff options
Diffstat (limited to 'include/asm-mips/hazards.h')
| -rw-r--r-- | include/asm-mips/hazards.h | 64 |
1 files changed, 61 insertions, 3 deletions
diff --git a/include/asm-mips/hazards.h b/include/asm-mips/hazards.h index d9119f43f9aa..2de638f84c86 100644 --- a/include/asm-mips/hazards.h +++ b/include/asm-mips/hazards.h @@ -3,18 +3,19 @@ * License. See the file "COPYING" in the main directory of this archive * for more details. * - * Copyright (C) 2003, 2004 Ralf Baechle <ralf@linux-mips.org> + * 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"); \ \ @@ -23,6 +24,11 @@ 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, @@ -81,6 +87,57 @@ do { \ : "=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) /* @@ -167,6 +224,7 @@ ASMMACRO(tlb_probe_hazard, nop; nop; nop ) ASMMACRO(irq_enable_hazard, + _ssnop; _ssnop; _ssnop; ) ASMMACRO(irq_disable_hazard, nop; nop; nop @@ -187,7 +245,7 @@ ASMMACRO(enable_fpu_hazard, .set mips64; .set noreorder; _ssnop; - bnezl $0,.+4; + bnezl $0, .+4; _ssnop; .set pop ) |