proc: basic infra for multithreading

including task and scheduler wrapper, context swap assembly, and some
notes... The lifetime of task is tricky, I'll fix it later

Signed-off-by: Tianhao Wang <shrik3@mailbox.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/src/arch/x86_64/asm/proc.s b/src/arch/x86_64/asm/proc.s
new file mode 100644
index 0000000..e1996a7
--- /dev/null
+++ b/src/arch/x86_64/asm/proc.s
@@ -0,0 +1,35 @@
+; vi: ft=nasm
+; vectors.s - idt for x86_64
+[BITS 64]
+[GLOBAL context_swap]
+[GLOBAL context_swap_to]
+; parameters 1 (rdi) pointer to from context
+; parameters 2 (rsi) pointer to to context
+; struct arch_reg::Context64
+context_swap:
+	mov     [rdi + 8*0], rbx
+	mov     [rdi + 8*1], r12
+	mov     [rdi + 8*2], r13
+	mov     [rdi + 8*3], r14
+	mov     [rdi + 8*4], r15
+	mov     [rdi + 8*5], rbp
+	mov     [rdi + 8*6], rsp
+	mov     rbx, [rsi + 8*0]
+	mov     r12, [rsi + 8*1]
+	mov     r13, [rsi + 8*2]
+	mov     r14, [rsi + 8*3]
+	mov     r15, [rsi + 8*4]
+	mov     rbp, [rsi + 8*5]
+	mov     rsp, [rsi + 8*6]
+	ret
+
+; parameters 1 (rdi) pointer to to context
+context_swap_to:
+	mov     rbx, [rdi + 8*0]
+	mov     r12, [rdi + 8*1]
+	mov     r13, [rdi + 8*2]
+	mov     r14, [rdi + 8*3]
+	mov     r15, [rdi + 8*4]
+	mov     rbp, [rdi + 8*5]
+	mov     rsp, [rdi + 8*6]
+	ret