From 86297c41a26f18d924e64fc93321c59cbc4c48dd Mon Sep 17 00:00:00 2001 From: Thomas Bushnell Date: Mon, 26 Apr 1999 05:58:44 +0000 Subject: 1998-11-30 OKUJI Yoshinori Clean up linux emulation code to make it architecture-independent as much as possible. * linux: Renamed from linuxdev. * Makefile.in (objfiles): Add linux.o instead of linuxdev.o. (MAKE): New variable. Used for the linux.o target. * configure.in: Add AC_CHECK_TOOL(MAKE, make). * i386/i386/spl.h: Include , for compatibility with OSF Mach 3.0. Suggested by Elgin Lee . * linux/src: Renamed from linux/linux. * linux/dev: Renamed from linux/mach. * linux/Drivers.in (AC_INIT): Use dev/include/linux/autoconf.h, instead of mach/include/linux/autoconf.h. * Makefile.in (all): Target ../linux.o instead of ../linuxdev.o. * linux/dev/drivers/block/genhd.c: Include instead of . * linux/dev/drivers/net/auto_irq.c: Remove unneeded header files, and . * linux/dev/init/main.c: Many i386-dependent codes moved to ... * linux/dev/arch/i386/irq.c: ... here. * linux/dev/arch/i386/setup.c: New file. * linux/dev/arch/i386/linux_emul.h: Likewise. * linux/dev/arch/i386/glue/timer.c: Merged into sched.c. * linux/dev/arch/i386/glue/sched.c: Include instead of , and moved to ... * linux/dev/kernel/sched.c: ... here. * linux/dev/arch/i386/glue/block.c: Include and , instead of i386-dependent header files, and moved to ... * linux/dev/glue/blocl.c: ... here. * linux/dev/arch/i386/glue/net.c: Include and , instead of i386-dependent header files, and moved to ... * linux/dev/glue/net.c: ... here. * linux/dev/arch/i386/glue/misc.c: Remove `x86' and moved to ... * linux/dev/glue/misc.c: ... here. * linux/dev/arch/i386/glue/kmem.c: Moved to ... * linux/dev/glue/kmem.c: ... here. --- linux/src/include/asm-i386/atomic.h | 67 +++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 linux/src/include/asm-i386/atomic.h (limited to 'linux/src/include/asm-i386/atomic.h') diff --git a/linux/src/include/asm-i386/atomic.h b/linux/src/include/asm-i386/atomic.h new file mode 100644 index 00000000..1b9d99f7 --- /dev/null +++ b/linux/src/include/asm-i386/atomic.h @@ -0,0 +1,67 @@ +#ifndef __ARCH_I386_ATOMIC__ +#define __ARCH_I386_ATOMIC__ + +/* + * Atomic operations that C can't guarantee us. Useful for + * resource counting etc.. + */ + +#ifdef __SMP__ +#define LOCK "lock ; " +#else +#define LOCK "" +#endif + +/* + * Make sure gcc doesn't try to be clever and move things around + * on us. We need to use _exactly_ the address the user gave us, + * not some alias that contains the same information. + */ +#define __atomic_fool_gcc(x) (*(struct { int a[100]; } *)x) + +typedef int atomic_t; + +static __inline__ void atomic_add(atomic_t i, atomic_t *v) +{ + __asm__ __volatile__( + LOCK "addl %1,%0" + :"=m" (__atomic_fool_gcc(v)) + :"ir" (i), "m" (__atomic_fool_gcc(v))); +} + +static __inline__ void atomic_sub(atomic_t i, atomic_t *v) +{ + __asm__ __volatile__( + LOCK "subl %1,%0" + :"=m" (__atomic_fool_gcc(v)) + :"ir" (i), "m" (__atomic_fool_gcc(v))); +} + +static __inline__ void atomic_inc(atomic_t *v) +{ + __asm__ __volatile__( + LOCK "incl %0" + :"=m" (__atomic_fool_gcc(v)) + :"m" (__atomic_fool_gcc(v))); +} + +static __inline__ void atomic_dec(atomic_t *v) +{ + __asm__ __volatile__( + LOCK "decl %0" + :"=m" (__atomic_fool_gcc(v)) + :"m" (__atomic_fool_gcc(v))); +} + +static __inline__ int atomic_dec_and_test(atomic_t *v) +{ + unsigned char c; + + __asm__ __volatile__( + LOCK "decl %0; sete %1" + :"=m" (__atomic_fool_gcc(v)), "=qm" (c) + :"m" (__atomic_fool_gcc(v))); + return c != 0; +} + +#endif -- cgit v1.2.3