diff options
| author | Mole Shang <135e2@135e2.dev> | 2024-02-13 19:39:56 +0800 |
|---|---|---|
| committer | Mole Shang <135e2@135e2.dev> | 2024-02-13 19:39:56 +0800 |
| commit | 89ef6f717ed4b3e702e5f6f906f58fe1ea27d366 (patch) | |
| tree | 760cce316675479a6cca77551438e8d2cc5fe9ae /kernel/riscv.h | |
| parent | cfae93475dfb4cb5cfe264f4c029136e1447c262 (diff) | |
| parent | 4a6593f1a6f666c618d303a4858c4c6d31b41c63 (diff) | |
| download | xv6-labs-89ef6f717ed4b3e702e5f6f906f58fe1ea27d366.tar.gz xv6-labs-89ef6f717ed4b3e702e5f6f906f58fe1ea27d366.tar.bz2 xv6-labs-89ef6f717ed4b3e702e5f6f906f58fe1ea27d366.zip | |
Merge branch 'cow' into net
Conflicts:
.gitignore
Makefile
conf/lab.mk
kernel/defs.h
kernel/syscall.c
kernel/vm.c
user/pingpong.c
user/user.h
user/usys.pl
Diffstat (limited to 'kernel/riscv.h')
| -rw-r--r-- | kernel/riscv.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/riscv.h b/kernel/riscv.h index 20a01db..7d6eb6e 100644 --- a/kernel/riscv.h +++ b/kernel/riscv.h @@ -327,6 +327,15 @@ sfence_vma() asm volatile("sfence.vma zero, zero"); } +// read the frame pointer of currently executing func +static inline uint64 +r_fp() +{ + uint64 x; + asm volatile("mv %0, s0" : "=r" (x) ); + return x; +} + typedef uint64 pte_t; typedef uint64 *pagetable_t; // 512 PTEs @@ -343,6 +352,8 @@ typedef uint64 *pagetable_t; // 512 PTEs #define PTE_W (1L << 2) #define PTE_X (1L << 3) #define PTE_U (1L << 4) // user can access +#define PTE_A (1L << 6) // riscv access bit +#define PTE_C (1L << 8) // RSW low bit, use it to mark whether a page is COW // shift a physical address to the right place for a PTE. #define PA2PTE(pa) ((((uint64)pa) >> 12) << 10) |