diff options
Diffstat (limited to 'libc/sysdeps/linux/mips/sys/asm.h')
| -rw-r--r-- | libc/sysdeps/linux/mips/sys/asm.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/mips/sys/asm.h b/libc/sysdeps/linux/mips/sys/asm.h index 76f6af3e1..4c8bd9cb2 100644 --- a/libc/sysdeps/linux/mips/sys/asm.h +++ b/libc/sysdeps/linux/mips/sys/asm.h @@ -469,5 +469,20 @@ symbol = value # define MFC0 dmfc0 # define MTC0 dmtc0 #endif +/* The MIPS archtectures do not have a uniform memory model. Particular + platforms may provide additional guarantees - for instance, the R4000 + LL and SC instructions implicitly perform a SYNC, and the 4K promises + strong ordering. + + However, in the absence of those guarantees, we must assume weak ordering + and SYNC explicitly where necessary. + + Some obsolete MIPS processors may not support the SYNC instruction. This + applies to "true" MIPS I processors; most of the processors which compile + using MIPS I implement parts of MIPS II. */ + +#ifndef MIPS_SYNC +# define MIPS_SYNC sync +#endif #endif /* sys/asm.h */ |