[MULTITASKING] Context switching and scheduler

2016-11-05 19:55:54 +01:00
parent 1f06c0bcf1
commit 5e8fbcbb78
9 changed files with 288 additions and 0 deletions
--- a/kernel/proc/swtch.S
+++ b/kernel/proc/swtch.S
@@ -0,0 +1,28 @@
+.intel_syntax noprefix
+
+.global swtch
+
+swtch:
+# void swtch(uint64_t *old, uint64_t *new)
+# Switches stacks preserving callee preserved registers according to System V ABI
+  push rbp
+  mov rbp, rsp
+  push r15
+  push r14
+  push r13
+  push r12
+  push rbx
+  push rbp
+  cmp rdi, 0x0
+  jz .switch_in
+  mov [rdi], rsp
+.switch_in:
+  mov rsp, [rsi]
+  pop rbp
+  pop rbx
+  pop r12
+  pop r13
+  pop r14
+  pop r15
+  leaveq
+  ret