diff options
Diffstat (limited to 'xenolinux-2.4.21-pre4-sparse/include/asm-xeno/rwlock.h')
| -rw-r--r-- | xenolinux-2.4.21-pre4-sparse/include/asm-xeno/rwlock.h | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/rwlock.h b/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/rwlock.h deleted file mode 100644 index 5c2f47040f..0000000000 --- a/xenolinux-2.4.21-pre4-sparse/include/asm-xeno/rwlock.h +++ /dev/null @@ -1,83 +0,0 @@ -/* include/asm-i386/rwlock.h - * - * Helpers used by both rw spinlocks and rw semaphores. - * - * Based in part on code from semaphore.h and - * spinlock.h Copyright 1996 Linus Torvalds. - * - * Copyright 1999 Red Hat, Inc. - * - * Written by Benjamin LaHaise. - * - * 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 _ASM_I386_RWLOCK_H -#define _ASM_I386_RWLOCK_H - -#define RW_LOCK_BIAS 0x01000000 -#define RW_LOCK_BIAS_STR "0x01000000" - -#define __build_read_lock_ptr(rw, helper) \ - asm volatile(LOCK "subl $1,(%0)\n\t" \ - "js 2f\n" \ - "1:\n" \ - LOCK_SECTION_START("") \ - "2:\tcall " helper "\n\t" \ - "jmp 1b\n" \ - LOCK_SECTION_END \ - ::"a" (rw) : "memory") - -#define __build_read_lock_const(rw, helper) \ - asm volatile(LOCK "subl $1,%0\n\t" \ - "js 2f\n" \ - "1:\n" \ - LOCK_SECTION_START("") \ - "2:\tpushl %%eax\n\t" \ - "leal %0,%%eax\n\t" \ - "call " helper "\n\t" \ - "popl %%eax\n\t" \ - "jmp 1b\n" \ - LOCK_SECTION_END \ - :"=m" (*(volatile int *)rw) : : "memory") - -#define __build_read_lock(rw, helper) do { \ - if (__builtin_constant_p(rw)) \ - __build_read_lock_const(rw, helper); \ - else \ - __build_read_lock_ptr(rw, helper); \ - } while (0) - -#define __build_write_lock_ptr(rw, helper) \ - asm volatile(LOCK "subl $" RW_LOCK_BIAS_STR ",(%0)\n\t" \ - "jnz 2f\n" \ - "1:\n" \ - LOCK_SECTION_START("") \ - "2:\tcall " helper "\n\t" \ - "jmp 1b\n" \ - LOCK_SECTION_END \ - ::"a" (rw) : "memory") - -#define __build_write_lock_const(rw, helper) \ - asm volatile(LOCK "subl $" RW_LOCK_BIAS_STR ",(%0)\n\t" \ - "jnz 2f\n" \ - "1:\n" \ - LOCK_SECTION_START("") \ - "2:\tpushl %%eax\n\t" \ - "leal %0,%%eax\n\t" \ - "call " helper "\n\t" \ - "popl %%eax\n\t" \ - "jmp 1b\n" \ - LOCK_SECTION_END \ - :"=m" (*(volatile int *)rw) : : "memory") - -#define __build_write_lock(rw, helper) do { \ - if (__builtin_constant_p(rw)) \ - __build_write_lock_const(rw, helper); \ - else \ - __build_write_lock_ptr(rw, helper); \ - } while (0) - -#endif |