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b148766e2b
The values stored in the length and condition fields of the alternative tables fit into 16 bits, so we can save 4 bytes per alternative table entry. Since a typical 32-bit kernel has more than 3000 entries this saves > 12k of storage on disc. bloat-o-meter shows a reduction of -0.01% by this change: Total: Before=10196505, After=10195529, chg -0.01% $ ls -la vmlinux vmlinux.before -rwxr-xr-x 14437324 vmlinux -rwxr-xr-x 14449512 vmlinux.before Signed-off-by: Helge Deller <deller@gmx.de>
64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_PARISC_ALTERNATIVE_H
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#define __ASM_PARISC_ALTERNATIVE_H
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#define ALT_COND_ALWAYS 0x80 /* always replace instruction */
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#define ALT_COND_NO_SMP 0x01 /* when running UP instead of SMP */
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#define ALT_COND_NO_DCACHE 0x02 /* if system has no d-cache */
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#define ALT_COND_NO_ICACHE 0x04 /* if system has no i-cache */
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#define ALT_COND_NO_SPLIT_TLB 0x08 /* if split_tlb == 0 */
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#define ALT_COND_NO_IOC_FDC 0x10 /* if I/O cache does not need flushes */
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#define ALT_COND_RUN_ON_QEMU 0x20 /* if running on QEMU */
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#define INSN_PxTLB 0x02 /* modify pdtlb, pitlb */
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#define INSN_NOP 0x08000240 /* nop */
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#ifndef __ASSEMBLY__
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/stddef.h>
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#include <linux/stringify.h>
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struct alt_instr {
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s32 orig_offset; /* offset to original instructions */
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s16 len; /* end of original instructions */
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u16 cond; /* see ALT_COND_XXX */
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u32 replacement; /* replacement instruction or code */
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} __packed;
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void set_kernel_text_rw(int enable_read_write);
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void apply_alternatives_all(void);
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void apply_alternatives(struct alt_instr *start, struct alt_instr *end,
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const char *module_name);
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/* Alternative SMP implementation. */
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#define ALTERNATIVE(cond, replacement) "!0:" \
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".section .altinstructions, \"aw\" !" \
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".word (0b-4-.) !" \
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".hword 1, " __stringify(cond) " !" \
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".word " __stringify(replacement) " !" \
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".previous"
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#else
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/* to replace one single instructions by a new instruction */
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#define ALTERNATIVE(from, to, cond, replacement)\
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.section .altinstructions, "aw" ! \
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.word (from - .) ! \
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.hword (to - from)/4, cond ! \
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.word replacement ! \
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.previous
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/* to replace multiple instructions by new code */
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#define ALTERNATIVE_CODE(from, num_instructions, cond, new_instr_ptr)\
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.section .altinstructions, "aw" ! \
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.word (from - .) ! \
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.hword -num_instructions, cond ! \
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.word (new_instr_ptr - .) ! \
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.previous
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_PARISC_ALTERNATIVE_H */
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