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afa8a93932
We have duplicated the definition of the nop instruction in ftrace.h and in jump_label.c. Move this definition into the generic file insn-def.h so that they can share the definition with each other and with future files. Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Tested-by: Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20250319-runtime_const_riscv-v10-1-745b31a11d65@rivosinc.com Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2020 Emil Renner Berthing
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*
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* Based on arch/arm64/kernel/jump_label.c
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*/
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#include <linux/jump_label.h>
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#include <linux/kernel.h>
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#include <linux/memory.h>
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#include <linux/mutex.h>
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#include <asm/bug.h>
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#include <asm/cacheflush.h>
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#include <asm/text-patching.h>
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#include <asm/insn-def.h>
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#define RISCV_INSN_JAL 0x0000006fU
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bool arch_jump_label_transform_queue(struct jump_entry *entry,
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enum jump_label_type type)
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{
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void *addr = (void *)jump_entry_code(entry);
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u32 insn;
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if (type == JUMP_LABEL_JMP) {
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long offset = jump_entry_target(entry) - jump_entry_code(entry);
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if (WARN_ON(offset & 1 || offset < -524288 || offset >= 524288))
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return true;
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insn = RISCV_INSN_JAL |
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(((u32)offset & GENMASK(19, 12)) << (12 - 12)) |
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(((u32)offset & GENMASK(11, 11)) << (20 - 11)) |
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(((u32)offset & GENMASK(10, 1)) << (21 - 1)) |
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(((u32)offset & GENMASK(20, 20)) << (31 - 20));
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} else {
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insn = RISCV_INSN_NOP4;
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}
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if (early_boot_irqs_disabled) {
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riscv_patch_in_stop_machine = 1;
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patch_insn_write(addr, &insn, sizeof(insn));
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riscv_patch_in_stop_machine = 0;
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} else {
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mutex_lock(&text_mutex);
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patch_insn_write(addr, &insn, sizeof(insn));
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mutex_unlock(&text_mutex);
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}
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return true;
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}
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void arch_jump_label_transform_apply(void)
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{
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flush_icache_all();
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}
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