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| author | Frans Kaashoek <kaashoek@mit.edu> | 2019-07-08 15:50:06 -0400 |
|---|---|---|
| committer | Frans Kaashoek <kaashoek@mit.edu> | 2019-07-08 15:50:06 -0400 |
| commit | 2f22a3ed6a8dbdd4dcfb2c0a43dc854a36a59cfc (patch) | |
| tree | 189387b82cfd998170d39dfc998de0fc86602544 /kernel/riscv.h | |
| parent | 75b0c6fc91c1264aaa5d080d9faeb87c90d02ad3 (diff) | |
| parent | 60ed537427c31d320ca4c8778d21d13304285b00 (diff) | |
| download | xv6-labs-2f22a3ed6a8dbdd4dcfb2c0a43dc854a36a59cfc.tar.gz xv6-labs-2f22a3ed6a8dbdd4dcfb2c0a43dc854a36a59cfc.tar.bz2 xv6-labs-2f22a3ed6a8dbdd4dcfb2c0a43dc854a36a59cfc.zip | |
Merge branch 'riscv-proc' into riscv
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 |