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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/parisc/include/asm/alternative.h
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/parisc/include/asm/alternative.h')
-rw-r--r--arch/parisc/include/asm/alternative.h66
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/parisc/include/asm/alternative.h b/arch/parisc/include/asm/alternative.h
new file mode 100644
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--- /dev/null
+++ b/arch/parisc/include/asm/alternative.h
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_PARISC_ALTERNATIVE_H
+#define __ASM_PARISC_ALTERNATIVE_H
+
+#define ALT_COND_ALWAYS 0x80 /* always replace instruction */
+#define ALT_COND_NO_SMP 0x01 /* when running UP instead of SMP */
+#define ALT_COND_NO_DCACHE 0x02 /* if system has no d-cache */
+#define ALT_COND_NO_ICACHE 0x04 /* if system has no i-cache */
+#define ALT_COND_NO_SPLIT_TLB 0x08 /* if split_tlb == 0 */
+#define ALT_COND_NO_IOC_FDC 0x10 /* if I/O cache does not need flushes */
+#define ALT_COND_RUN_ON_QEMU 0x20 /* if running on QEMU */
+
+#define INSN_PxTLB 0x02 /* modify pdtlb, pitlb */
+#define INSN_NOP 0x08000240 /* nop */
+
+#ifndef __ASSEMBLY__
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/stddef.h>
+#include <linux/stringify.h>
+
+struct alt_instr {
+ s32 orig_offset; /* offset to original instructions */
+ s16 len; /* end of original instructions */
+ u16 cond; /* see ALT_COND_XXX */
+ u32 replacement; /* replacement instruction or code */
+} __packed;
+
+void set_kernel_text_rw(int enable_read_write);
+void apply_alternatives_all(void);
+void apply_alternatives(struct alt_instr *start, struct alt_instr *end,
+ const char *module_name);
+
+/* Alternative SMP implementation. */
+#define ALTERNATIVE(cond, replacement) "!0:" \
+ ".section .altinstructions, \"a\" !" \
+ ".align 4 !" \
+ ".word (0b-4-.) !" \
+ ".hword 1, " __stringify(cond) " !" \
+ ".word " __stringify(replacement) " !" \
+ ".previous"
+
+#else
+
+/* to replace one single instructions by a new instruction */
+#define ALTERNATIVE(from, to, cond, replacement)\
+ .section .altinstructions, "a" ! \
+ .align 4 ! \
+ .word (from - .) ! \
+ .hword (to - from)/4, cond ! \
+ .word replacement ! \
+ .previous
+
+/* to replace multiple instructions by new code */
+#define ALTERNATIVE_CODE(from, num_instructions, cond, new_instr_ptr)\
+ .section .altinstructions, "a" ! \
+ .align 4 ! \
+ .word (from - .) ! \
+ .hword -num_instructions, cond ! \
+ .word (new_instr_ptr - .) ! \
+ .previous
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __ASM_PARISC_ALTERNATIVE_H */