| /* |
| * 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 |
| |
| #include <linux/stringify.h> |
| #include <asm/compiler.h> |
| |
| #define ___ssnop \ |
| sll $0, $0, 1 |
| |
| #define ___ehb \ |
| sll $0, $0, 3 |
| |
| /* |
| * TLB hazards |
| */ |
| #if (defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)) && \ |
| !defined(CONFIG_CPU_CAVIUM_OCTEON) && !defined(CONFIG_LOONGSON3_ENHANCEMENT) |
| |
| /* |
| * MIPSR2 defines ehb for hazard avoidance |
| */ |
| |
| #define __mtc0_tlbw_hazard \ |
| ___ehb |
| |
| #define __mtc0_tlbr_hazard \ |
| ___ehb |
| |
| #define __tlbw_use_hazard \ |
| ___ehb |
| |
| #define __tlb_read_hazard \ |
| ___ehb |
| |
| #define __tlb_probe_hazard \ |
| ___ehb |
| |
| #define __irq_enable_hazard \ |
| ___ehb |
| |
| #define __irq_disable_hazard \ |
| ___ehb |
| |
| #define __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 alternative 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 "MIPS_ISA_LEVEL" \n" \ |
| " dla %0, 1f \n" \ |
| " jr.hb %0 \n" \ |
| " .set mips0 \n" \ |
| "1: \n" \ |
| : "=r" (tmp)); \ |
| } while (0) |
| |
| #elif (defined(CONFIG_CPU_MIPSR1) && !defined(CONFIG_MIPS_ALCHEMY)) || \ |
| defined(CONFIG_CPU_BMIPS) |
| |
| /* |
| * These are slightly complicated by the fact that we guarantee R1 kernels to |
| * run fine on R2 processors. |
| */ |
| |
| #define __mtc0_tlbw_hazard \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ehb |
| |
| #define __mtc0_tlbr_hazard \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ehb |
| |
| #define __tlbw_use_hazard \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ehb |
| |
| #define __tlb_read_hazard \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ehb |
| |
| #define __tlb_probe_hazard \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ehb |
| |
| #define __irq_enable_hazard \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ehb |
| |
| #define __irq_disable_hazard \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ehb |
| |
| #define __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 alternative 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_r6) \ |
| __instruction_hazard(); \ |
| } while (0) |
| |
| #elif defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_CPU_CAVIUM_OCTEON) || \ |
| defined(CONFIG_CPU_LOONGSON2) || defined(CONFIG_LOONGSON3_ENHANCEMENT) || \ |
| defined(CONFIG_CPU_R10000) || defined(CONFIG_CPU_R5500) || defined(CONFIG_CPU_XLR) |
| |
| /* |
| * R10000 rocks - all hazards handled in hardware, so this becomes a nobrainer. |
| */ |
| |
| #define __mtc0_tlbw_hazard |
| |
| #define __mtc0_tlbr_hazard |
| |
| #define __tlbw_use_hazard |
| |
| #define __tlb_read_hazard |
| |
| #define __tlb_probe_hazard |
| |
| #define __irq_enable_hazard |
| |
| #define __irq_disable_hazard |
| |
| #define __back_to_back_c0_hazard |
| |
| #define instruction_hazard() do { } while (0) |
| |
| #elif defined(CONFIG_CPU_SB1) |
| |
| /* |
| * Mostly like R4000 for historic reasons |
| */ |
| #define __mtc0_tlbw_hazard |
| |
| #define __mtc0_tlbr_hazard |
| |
| #define __tlbw_use_hazard |
| |
| #define __tlb_read_hazard |
| |
| #define __tlb_probe_hazard |
| |
| #define __irq_enable_hazard |
| |
| #define __irq_disable_hazard \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ssnop |
| |
| #define __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. |
| */ |
| #define __mtc0_tlbw_hazard \ |
| nop; \ |
| nop |
| |
| #define __mtc0_tlbr_hazard \ |
| nop; \ |
| nop |
| |
| #define __tlbw_use_hazard \ |
| nop; \ |
| nop; \ |
| nop |
| |
| #define __tlb_read_hazard \ |
| nop; \ |
| nop; \ |
| nop |
| |
| #define __tlb_probe_hazard \ |
| nop; \ |
| nop; \ |
| nop |
| |
| #define __irq_enable_hazard \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ssnop |
| |
| #define __irq_disable_hazard \ |
| nop; \ |
| nop; \ |
| nop |
| |
| #define __back_to_back_c0_hazard \ |
| ___ssnop; \ |
| ___ssnop; \ |
| ___ssnop |
| |
| #define instruction_hazard() do { } while (0) |
| |
| #endif |
| |
| |
| /* FPU hazards */ |
| |
| #if defined(CONFIG_CPU_SB1) |
| |
| #define __enable_fpu_hazard \ |
| .set push; \ |
| .set mips64; \ |
| .set noreorder; \ |
| ___ssnop; \ |
| bnezl $0, .+4; \ |
| ___ssnop; \ |
| .set pop |
| |
| #define __disable_fpu_hazard |
| |
| #elif defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) |
| |
| #define __enable_fpu_hazard \ |
| ___ehb |
| |
| #define __disable_fpu_hazard \ |
| ___ehb |
| |
| #else |
| |
| #define __enable_fpu_hazard \ |
| nop; \ |
| nop; \ |
| nop; \ |
| nop |
| |
| #define __disable_fpu_hazard \ |
| ___ehb |
| |
| #endif |
| |
| #ifdef __ASSEMBLY__ |
| |
| #define _ssnop ___ssnop |
| #define _ehb ___ehb |
| #define mtc0_tlbw_hazard __mtc0_tlbw_hazard |
| #define mtc0_tlbr_hazard __mtc0_tlbr_hazard |
| #define tlbw_use_hazard __tlbw_use_hazard |
| #define tlb_read_hazard __tlb_read_hazard |
| #define tlb_probe_hazard __tlb_probe_hazard |
| #define irq_enable_hazard __irq_enable_hazard |
| #define irq_disable_hazard __irq_disable_hazard |
| #define back_to_back_c0_hazard __back_to_back_c0_hazard |
| #define enable_fpu_hazard __enable_fpu_hazard |
| #define disable_fpu_hazard __disable_fpu_hazard |
| |
| #else |
| |
| #define _ssnop() \ |
| do { \ |
| __asm__ __volatile__( \ |
| __stringify(___ssnop) \ |
| ); \ |
| } while (0) |
| |
| #define _ehb() \ |
| do { \ |
| __asm__ __volatile__( \ |
| __stringify(___ehb) \ |
| ); \ |
| } while (0) |
| |
| |
| #define mtc0_tlbw_hazard() \ |
| do { \ |
| __asm__ __volatile__( \ |
| __stringify(__mtc0_tlbw_hazard) \ |
| ); \ |
| } while (0) |
| |
| |
| #define mtc0_tlbr_hazard() \ |
| do { \ |
| __asm__ __volatile__( \ |
| __stringify(__mtc0_tlbr_hazard) \ |
| ); \ |
| } while (0) |
| |
| |
| #define tlbw_use_hazard() \ |
| do { \ |
| __asm__ __volatile__( \ |
| __stringify(__tlbw_use_hazard) \ |
| ); \ |
| } while (0) |
| |
| |
| #define tlb_read_hazard() \ |
| do { \ |
| __asm__ __volatile__( \ |
| __stringify(__tlb_read_hazard) \ |
| ); \ |
| } while (0) |
| |
| |
| #define tlb_probe_hazard() \ |
| do { \ |
| __asm__ __volatile__( \ |
| __stringify(__tlb_probe_hazard) \ |
| ); \ |
| } while (0) |
| |
| |
| #define irq_enable_hazard() \ |
| do { \ |
| __asm__ __volatile__( \ |
| __stringify(__irq_enable_hazard) \ |
| ); \ |
| } while (0) |
| |
| |
| #define irq_disable_hazard() \ |
| do { \ |
| __asm__ __volatile__( \ |
| __stringify(__irq_disable_hazard) \ |
| ); \ |
| } while (0) |
| |
| |
| #define back_to_back_c0_hazard() \ |
| do { \ |
| __asm__ __volatile__( \ |
| __stringify(__back_to_back_c0_hazard) \ |
| ); \ |
| } while (0) |
| |
| |
| #define enable_fpu_hazard() \ |
| do { \ |
| __asm__ __volatile__( \ |
| __stringify(__enable_fpu_hazard) \ |
| ); \ |
| } while (0) |
| |
| |
| #define disable_fpu_hazard() \ |
| do { \ |
| __asm__ __volatile__( \ |
| __stringify(__disable_fpu_hazard) \ |
| ); \ |
| } while (0) |
| |
| /* |
| * MIPS R2 instruction hazard barrier. Needs to be called as a subroutine. |
| */ |
| extern void mips_ihb(void); |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| #endif /* _ASM_HAZARDS_H */ |
