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| author | Robert Morris <rtm@csail.mit.edu> | 2019-06-11 09:57:14 -0400 |
|---|---|---|
| committer | Robert Morris <rtm@csail.mit.edu> | 2019-06-11 09:57:14 -0400 |
| commit | 5753553213df8f9de851adb68377db43faecb91f (patch) | |
| tree | 3b629ff54897fca414146677532cb459a2ed11ba /kernel/swtch.S | |
| parent | 91ba81110acd3163f7de3580b677eece0c57f5e7 (diff) | |
| download | xv6-labs-5753553213df8f9de851adb68377db43faecb91f.tar.gz xv6-labs-5753553213df8f9de851adb68377db43faecb91f.tar.bz2 xv6-labs-5753553213df8f9de851adb68377db43faecb91f.zip | |
separate source into kernel/ user/ mkfs/
Diffstat (limited to 'kernel/swtch.S')
| -rw-r--r-- | kernel/swtch.S | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/kernel/swtch.S b/kernel/swtch.S new file mode 100644 index 0000000..17a8663 --- /dev/null +++ b/kernel/swtch.S @@ -0,0 +1,42 @@ +# Context switch +# +# void swtch(struct context *old, struct context *new); +# +# Save current registers in old. Load from new. + + +.globl swtch +swtch: + sd ra, 0(a0) + sd sp, 8(a0) + sd s0, 16(a0) + sd s1, 24(a0) + sd s2, 32(a0) + sd s3, 40(a0) + sd s4, 48(a0) + sd s5, 56(a0) + sd s6, 64(a0) + sd s7, 72(a0) + sd s8, 80(a0) + sd s9, 88(a0) + sd s10, 96(a0) + sd s11, 104(a0) + + ld ra, 0(a1) + ld sp, 8(a1) + ld s0, 16(a1) + ld s1, 24(a1) + ld s2, 32(a1) + ld s3, 40(a1) + ld s4, 48(a1) + ld s5, 56(a1) + ld s6, 64(a1) + ld s7, 72(a1) + ld s8, 80(a1) + ld s9, 88(a1) + ld s10, 96(a1) + ld s11, 104(a1) + + ret + + |