From 572afc248c33c902760f6f24a72c180f0e4f1719 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Fri, 21 Sep 2007 13:05:44 +0100 Subject: [MIPS] R1: Fix hazard barriers to make kernels work on R2 also. Tested with Malta; inflates malta_defconfig by 3932 bytes. Ideally there should be additional configuration to allow getting rid of this overhead but that would be too much complexity at this stage of the release cycle. Signed-off-by: Ralf Baechle --- include/asm-mips/hazards.h | 54 +++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 53 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/asm-mips/hazards.h b/include/asm-mips/hazards.h index 7e843b5fee9..2de638f84c8 100644 --- a/include/asm-mips/hazards.h +++ b/include/asm-mips/hazards.h @@ -10,11 +10,12 @@ #ifndef _ASM_HAZARDS_H #define _ASM_HAZARDS_H - #ifdef __ASSEMBLY__ #define ASMMACRO(name, code...) .macro name; code; .endm #else +#include + #define ASMMACRO(name, code...) \ __asm__(".macro " #name "; " #code "; .endm"); \ \ @@ -86,6 +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) /* -- cgit v1.2.3-18-g5258