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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2025 Chen Miao
*
* Based on arch/arm/kernel/jump_label.c
*/
#include <linux/jump_label.h>
#include <linux/kernel.h>
#include <linux/memory.h>
#include <asm/bug.h>
#include <asm/cacheflush.h>
#include <asm/text-patching.h>
bool arch_jump_label_transform_queue(struct jump_entry *entry,
enum jump_label_type type)
{
void *addr = (void *)jump_entry_code(entry);
u32 insn;
if (type == JUMP_LABEL_JMP) {
long offset;
offset = jump_entry_target(entry) - jump_entry_code(entry);
/*
* The actual maximum range of the l.j instruction's offset is -134,217,728
* ~ 134,217,724 (sign 26-bit imm).
* For the original jump range, we need to right-shift N by 2 to obtain the
* instruction's offset.
*/
WARN_ON_ONCE(offset < -134217728 || offset > 134217724);
/* 26bit imm mask */
offset = (offset >> 2) & 0x03ffffff;
insn = offset;
} else {
insn = OPENRISC_INSN_NOP;
}
if (early_boot_irqs_disabled)
copy_to_kernel_nofault(addr, &insn, sizeof(insn));
else
patch_insn_write(addr, insn);
return true;
}
void arch_jump_label_transform_apply(void)
{
kick_all_cpus_sync();
}
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