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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /arch/powerpc/include/asm/jump_label.h | |
parent | Initial commit. (diff) | |
download | linux-upstream/4.19.249.tar.xz linux-upstream/4.19.249.zip |
Adding upstream version 4.19.249.upstream/4.19.249upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/powerpc/include/asm/jump_label.h')
-rw-r--r-- | arch/powerpc/include/asm/jump_label.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/jump_label.h b/arch/powerpc/include/asm/jump_label.h new file mode 100644 index 000000000..a3b2cf940 --- /dev/null +++ b/arch/powerpc/include/asm/jump_label.h @@ -0,0 +1,70 @@ +#ifndef _ASM_POWERPC_JUMP_LABEL_H +#define _ASM_POWERPC_JUMP_LABEL_H + +/* + * Copyright 2010 Michael Ellerman, IBM Corp. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#ifndef __ASSEMBLY__ +#include <linux/types.h> + +#include <asm/feature-fixups.h> +#include <asm/asm-const.h> + +#define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) +#define JUMP_LABEL_NOP_SIZE 4 + +static __always_inline bool arch_static_branch(struct static_key *key, bool branch) +{ + asm_volatile_goto("1:\n\t" + "nop # arch_static_branch\n\t" + ".pushsection __jump_table, \"aw\"\n\t" + JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" + ".popsection \n\t" + : : "i" (&((char *)key)[branch]) : : l_yes); + + return false; +l_yes: + return true; +} + +static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) +{ + asm_volatile_goto("1:\n\t" + "b %l[l_yes] # arch_static_branch_jump\n\t" + ".pushsection __jump_table, \"aw\"\n\t" + JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" + ".popsection \n\t" + : : "i" (&((char *)key)[branch]) : : l_yes); + + return false; +l_yes: + return true; +} + +#ifdef CONFIG_PPC64 +typedef u64 jump_label_t; +#else +typedef u32 jump_label_t; +#endif + +struct jump_entry { + jump_label_t code; + jump_label_t target; + jump_label_t key; +}; + +#else +#define ARCH_STATIC_BRANCH(LABEL, KEY) \ +1098: nop; \ + .pushsection __jump_table, "aw"; \ + FTR_ENTRY_LONG 1098b, LABEL, KEY; \ + .popsection +#endif + +#endif /* _ASM_POWERPC_JUMP_LABEL_H */ |