diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-v850/system.h | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/asm-v850/system.h')
-rw-r--r-- | include/asm-v850/system.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/include/asm-v850/system.h b/include/asm-v850/system.h new file mode 100644 index 000000000000..20f4c738c04e --- /dev/null +++ b/include/asm-v850/system.h @@ -0,0 +1,113 @@ +/* + * include/asm-v850/system.h -- Low-level interrupt/thread ops + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#ifndef __V850_SYSTEM_H__ +#define __V850_SYSTEM_H__ + +#include <linux/linkage.h> +#include <asm/ptrace.h> + + +#define prepare_to_switch() do { } while (0) + +/* + * switch_to(n) should switch tasks to task ptr, first checking that + * ptr isn't the current task, in which case it does nothing. + */ +struct thread_struct; +extern void *switch_thread (struct thread_struct *last, + struct thread_struct *next); +#define switch_to(prev,next,last) \ + do { \ + if (prev != next) { \ + (last) = switch_thread (&prev->thread, &next->thread); \ + } \ + } while (0) + + +/* Enable/disable interrupts. */ +#define local_irq_enable() __asm__ __volatile__ ("ei") +#define local_irq_disable() __asm__ __volatile__ ("di") + +#define local_save_flags(flags) \ + __asm__ __volatile__ ("stsr %1, %0" : "=r" (flags) : "i" (SR_PSW)) +#define local_restore_flags(flags) \ + __asm__ __volatile__ ("ldsr %0, %1" :: "r" (flags), "i" (SR_PSW)) + +/* For spinlocks etc */ +#define local_irq_save(flags) \ + do { local_save_flags (flags); local_irq_disable (); } while (0) +#define local_irq_restore(flags) \ + local_restore_flags (flags); + + +static inline int irqs_disabled (void) +{ + unsigned flags; + local_save_flags (flags); + return !!(flags & 0x20); +} + + +/* + * Force strict CPU ordering. + * Not really required on v850... + */ +#define nop() __asm__ __volatile__ ("nop") +#define mb() __asm__ __volatile__ ("" ::: "memory") +#define rmb() mb () +#define wmb() mb () +#define read_barrier_depends() ((void)0) +#define set_rmb(var, value) do { xchg (&var, value); } while (0) +#define set_mb(var, value) set_rmb (var, value) +#define set_wmb(var, value) do { var = value; wmb (); } while (0) + +#define smp_mb() mb () +#define smp_rmb() rmb () +#define smp_wmb() wmb () +#define smp_read_barrier_depends() read_barrier_depends() + +#define xchg(ptr, with) \ + ((__typeof__ (*(ptr)))__xchg ((unsigned long)(with), (ptr), sizeof (*(ptr)))) +#define tas(ptr) (xchg ((ptr), 1)) + +extern inline unsigned long __xchg (unsigned long with, + __volatile__ void *ptr, int size) +{ + unsigned long tmp, flags; + + local_irq_save (flags); + + switch (size) { + case 1: + tmp = *(unsigned char *)ptr; + *(unsigned char *)ptr = with; + break; + case 2: + tmp = *(unsigned short *)ptr; + *(unsigned short *)ptr = with; + break; + case 4: + tmp = *(unsigned long *)ptr; + *(unsigned long *)ptr = with; + break; + } + + local_irq_restore (flags); + + return tmp; +} + +#define arch_align_stack(x) (x) + +#endif /* __V850_SYSTEM_H__ */ |