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| author | Frans Kaashoek <kaashoek@mit.edu> | 2019-07-02 13:40:33 -0400 |
|---|---|---|
| committer | Frans Kaashoek <kaashoek@mit.edu> | 2019-07-02 13:40:33 -0400 |
| commit | da51735980e500922bc108a3444b64ac9450032e (patch) | |
| tree | 76ad738ff42f56a36ea2300b2d90946e64d5040e /kernel/riscv.h | |
| parent | 67702cf706bce7adef472f0caa48d81ddfaeb33a (diff) | |
| download | xv6-labs-da51735980e500922bc108a3444b64ac9450032e.tar.gz xv6-labs-da51735980e500922bc108a3444b64ac9450032e.tar.bz2 xv6-labs-da51735980e500922bc108a3444b64ac9450032e.zip | |
Avoid two cores selecting the same process to run
Diffstat (limited to 'kernel/riscv.h')
| -rw-r--r-- | kernel/riscv.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/riscv.h b/kernel/riscv.h index c3371a4..e5c0f64 100644 --- a/kernel/riscv.h +++ b/kernel/riscv.h @@ -304,6 +304,15 @@ w_tp(uint64 x) asm volatile("mv tp, %0" : : "r" (x)); } +static inline uint64 +r_ra() +{ + uint64 x; + asm volatile("mv %0, ra" : "=r" (x) ); + return x; +} + + #define PGSIZE 4096 // bytes per page #define PGSHIFT 12 // bits of offset within a page |