mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 04:46:32 +07:00
378ed6f0e3
We currently have 2 commonly used methods for switching ISA within
assembly code, then restoring the original ISA.
1) Using a pair of .set push & .set pop directives. For example:
.set push
.set mips32r2
<some_insn>
.set pop
2) Using .set mips0 to restore the ISA originally specified on the
command line. For example:
.set mips32r2
<some_insn>
.set mips0
Unfortunately method 2 does not work with nanoMIPS toolchains, where the
assembler rejects the .set mips0 directive like so:
Error: cannot change ISA from nanoMIPS to mips0
In preparation for supporting nanoMIPS builds, switch all instances of
method 2 in generic non-platform-specific code to use push & pop as in
method 1 instead. The .set push & .set pop is arguably cleaner anyway,
and if nothing else it's good to consistently use one method.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/21037/
Cc: linux-mips@linux-mips.org
421 lines
8.4 KiB
C
421 lines
8.4 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2003, 04, 07 Ralf Baechle <ralf@linux-mips.org>
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* Copyright (C) MIPS Technologies, Inc.
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* written by Ralf Baechle <ralf@linux-mips.org>
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*/
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#ifndef _ASM_HAZARDS_H
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#define _ASM_HAZARDS_H
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#include <linux/stringify.h>
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#include <asm/compiler.h>
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#define ___ssnop \
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sll $0, $0, 1
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#define ___ehb \
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sll $0, $0, 3
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/*
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* TLB hazards
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*/
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#if (defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)) && \
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!defined(CONFIG_CPU_CAVIUM_OCTEON) && !defined(CONFIG_LOONGSON3_ENHANCEMENT)
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/*
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* MIPSR2 defines ehb for hazard avoidance
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*/
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#define __mtc0_tlbw_hazard \
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___ehb
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#define __mtc0_tlbr_hazard \
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___ehb
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#define __tlbw_use_hazard \
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___ehb
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#define __tlb_read_hazard \
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___ehb
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#define __tlb_probe_hazard \
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___ehb
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#define __irq_enable_hazard \
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___ehb
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#define __irq_disable_hazard \
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___ehb
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#define __back_to_back_c0_hazard \
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___ehb
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/*
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* gcc has a tradition of misscompiling the previous construct using the
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* address of a label as argument to inline assembler. Gas otoh has the
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* annoying difference between la and dla which are only usable for 32-bit
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* rsp. 64-bit code, so can't be used without conditional compilation.
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* The alternative is switching the assembler to 64-bit code which happens
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* to work right even for 32-bit code...
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*/
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#define instruction_hazard() \
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do { \
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unsigned long tmp; \
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\
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__asm__ __volatile__( \
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" .set push \n" \
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" .set "MIPS_ISA_LEVEL" \n" \
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" dla %0, 1f \n" \
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" jr.hb %0 \n" \
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" .set pop \n" \
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"1: \n" \
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: "=r" (tmp)); \
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} while (0)
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#elif (defined(CONFIG_CPU_MIPSR1) && !defined(CONFIG_MIPS_ALCHEMY)) || \
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defined(CONFIG_CPU_BMIPS)
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/*
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* These are slightly complicated by the fact that we guarantee R1 kernels to
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* run fine on R2 processors.
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*/
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#define __mtc0_tlbw_hazard \
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___ssnop; \
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___ssnop; \
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___ehb
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#define __mtc0_tlbr_hazard \
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___ssnop; \
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___ssnop; \
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___ehb
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#define __tlbw_use_hazard \
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___ssnop; \
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___ssnop; \
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___ssnop; \
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___ehb
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#define __tlb_read_hazard \
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___ssnop; \
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___ssnop; \
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___ssnop; \
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___ehb
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#define __tlb_probe_hazard \
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___ssnop; \
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___ssnop; \
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___ssnop; \
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___ehb
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#define __irq_enable_hazard \
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___ssnop; \
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___ssnop; \
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___ssnop; \
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___ehb
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#define __irq_disable_hazard \
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___ssnop; \
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___ssnop; \
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___ssnop; \
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___ehb
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#define __back_to_back_c0_hazard \
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___ssnop; \
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___ssnop; \
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___ssnop; \
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___ehb
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/*
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* gcc has a tradition of misscompiling the previous construct using the
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* address of a label as argument to inline assembler. Gas otoh has the
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* annoying difference between la and dla which are only usable for 32-bit
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* rsp. 64-bit code, so can't be used without conditional compilation.
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* The alternative is switching the assembler to 64-bit code which happens
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* to work right even for 32-bit code...
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*/
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#define __instruction_hazard() \
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do { \
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unsigned long tmp; \
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\
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__asm__ __volatile__( \
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" .set push \n" \
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" .set mips64r2 \n" \
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" dla %0, 1f \n" \
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" jr.hb %0 \n" \
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" .set pop \n" \
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"1: \n" \
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: "=r" (tmp)); \
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} while (0)
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#define instruction_hazard() \
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do { \
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if (cpu_has_mips_r2_r6) \
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__instruction_hazard(); \
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} while (0)
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#elif defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_CPU_CAVIUM_OCTEON) || \
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defined(CONFIG_CPU_LOONGSON2) || defined(CONFIG_LOONGSON3_ENHANCEMENT) || \
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defined(CONFIG_CPU_R10000) || defined(CONFIG_CPU_R5500) || defined(CONFIG_CPU_XLR)
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/*
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* R10000 rocks - all hazards handled in hardware, so this becomes a nobrainer.
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*/
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#define __mtc0_tlbw_hazard
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#define __mtc0_tlbr_hazard
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#define __tlbw_use_hazard
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#define __tlb_read_hazard
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#define __tlb_probe_hazard
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#define __irq_enable_hazard
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#define __irq_disable_hazard
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#define __back_to_back_c0_hazard
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#define instruction_hazard() do { } while (0)
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#elif defined(CONFIG_CPU_SB1)
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/*
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* Mostly like R4000 for historic reasons
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*/
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#define __mtc0_tlbw_hazard
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#define __mtc0_tlbr_hazard
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#define __tlbw_use_hazard
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#define __tlb_read_hazard
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#define __tlb_probe_hazard
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#define __irq_enable_hazard
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#define __irq_disable_hazard \
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___ssnop; \
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___ssnop; \
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___ssnop
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#define __back_to_back_c0_hazard
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#define instruction_hazard() do { } while (0)
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#else
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/*
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* Finally the catchall case for all other processors including R4000, R4400,
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* R4600, R4700, R5000, RM7000, NEC VR41xx etc.
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*
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* The taken branch will result in a two cycle penalty for the two killed
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* instructions on R4000 / R4400. Other processors only have a single cycle
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* hazard so this is nice trick to have an optimal code for a range of
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* processors.
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*/
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#define __mtc0_tlbw_hazard \
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nop; \
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nop
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#define __mtc0_tlbr_hazard \
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nop; \
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nop
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#define __tlbw_use_hazard \
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nop; \
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nop; \
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nop
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#define __tlb_read_hazard \
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nop; \
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nop; \
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nop
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#define __tlb_probe_hazard \
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nop; \
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nop; \
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nop
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#define __irq_enable_hazard \
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___ssnop; \
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___ssnop; \
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___ssnop
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#define __irq_disable_hazard \
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nop; \
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nop; \
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nop
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#define __back_to_back_c0_hazard \
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___ssnop; \
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___ssnop; \
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___ssnop
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#define instruction_hazard() do { } while (0)
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#endif
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/* FPU hazards */
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#if defined(CONFIG_CPU_SB1)
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#define __enable_fpu_hazard \
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.set push; \
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.set mips64; \
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.set noreorder; \
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___ssnop; \
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bnezl $0, .+4; \
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___ssnop; \
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.set pop
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#define __disable_fpu_hazard
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#elif defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
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#define __enable_fpu_hazard \
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___ehb
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#define __disable_fpu_hazard \
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___ehb
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#else
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#define __enable_fpu_hazard \
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nop; \
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nop; \
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nop; \
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nop
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#define __disable_fpu_hazard \
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___ehb
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#endif
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#ifdef __ASSEMBLY__
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#define _ssnop ___ssnop
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#define _ehb ___ehb
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#define mtc0_tlbw_hazard __mtc0_tlbw_hazard
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#define mtc0_tlbr_hazard __mtc0_tlbr_hazard
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#define tlbw_use_hazard __tlbw_use_hazard
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#define tlb_read_hazard __tlb_read_hazard
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#define tlb_probe_hazard __tlb_probe_hazard
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#define irq_enable_hazard __irq_enable_hazard
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#define irq_disable_hazard __irq_disable_hazard
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#define back_to_back_c0_hazard __back_to_back_c0_hazard
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#define enable_fpu_hazard __enable_fpu_hazard
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#define disable_fpu_hazard __disable_fpu_hazard
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#else
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#define _ssnop() \
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do { \
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__asm__ __volatile__( \
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__stringify(___ssnop) \
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); \
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} while (0)
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#define _ehb() \
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do { \
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__asm__ __volatile__( \
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__stringify(___ehb) \
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); \
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} while (0)
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#define mtc0_tlbw_hazard() \
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do { \
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__asm__ __volatile__( \
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__stringify(__mtc0_tlbw_hazard) \
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); \
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} while (0)
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#define mtc0_tlbr_hazard() \
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do { \
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__asm__ __volatile__( \
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__stringify(__mtc0_tlbr_hazard) \
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); \
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} while (0)
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#define tlbw_use_hazard() \
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do { \
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__asm__ __volatile__( \
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__stringify(__tlbw_use_hazard) \
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); \
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} while (0)
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#define tlb_read_hazard() \
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do { \
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__asm__ __volatile__( \
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__stringify(__tlb_read_hazard) \
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); \
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} while (0)
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#define tlb_probe_hazard() \
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do { \
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__asm__ __volatile__( \
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__stringify(__tlb_probe_hazard) \
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); \
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} while (0)
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#define irq_enable_hazard() \
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do { \
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__asm__ __volatile__( \
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__stringify(__irq_enable_hazard) \
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); \
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} while (0)
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#define irq_disable_hazard() \
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do { \
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__asm__ __volatile__( \
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__stringify(__irq_disable_hazard) \
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); \
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} while (0)
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#define back_to_back_c0_hazard() \
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do { \
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__asm__ __volatile__( \
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__stringify(__back_to_back_c0_hazard) \
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); \
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} while (0)
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#define enable_fpu_hazard() \
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do { \
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__asm__ __volatile__( \
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__stringify(__enable_fpu_hazard) \
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); \
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} while (0)
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#define disable_fpu_hazard() \
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do { \
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__asm__ __volatile__( \
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__stringify(__disable_fpu_hazard) \
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); \
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} while (0)
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/*
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* MIPS R2 instruction hazard barrier. Needs to be called as a subroutine.
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*/
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extern void mips_ihb(void);
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_HAZARDS_H */
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