parent
6ffe9c0d03
commit
fb9855b5ef
@ -1,37 +1,34 @@
|
||||
.altmacro
|
||||
.macro SAVE_SN n
|
||||
sd s\n, (\n+1)*8(sp)
|
||||
sd s\n, (\n+2)*8(a0)
|
||||
.endm
|
||||
.macro LOAD_SN n
|
||||
ld s\n, (\n+1)*8(sp)
|
||||
ld s\n, (\n+2)*8(a1)
|
||||
.endm
|
||||
.section .text
|
||||
.globl __switch
|
||||
__switch:
|
||||
# __switch(
|
||||
# current_task_cx_ptr2: &*const TaskContext,
|
||||
# next_task_cx_ptr2: &*const TaskContext
|
||||
# current_task_cx_ptr: *mut TaskContext,
|
||||
# next_task_cx_ptr: *const TaskContext
|
||||
# )
|
||||
# push TaskContext to current sp and save its address to where a0 points to
|
||||
addi sp, sp, -13*8
|
||||
sd sp, 0(a0)
|
||||
# fill TaskContext with ra & s0-s11
|
||||
sd ra, 0(sp)
|
||||
# save kernel stack of current task
|
||||
sd sp, 8(a0)
|
||||
# save ra & s0~s11 of current execution
|
||||
sd ra, 0(a0)
|
||||
.set n, 0
|
||||
.rept 12
|
||||
SAVE_SN %n
|
||||
.set n, n + 1
|
||||
.endr
|
||||
# ready for loading TaskContext a1 points to
|
||||
ld sp, 0(a1)
|
||||
# load registers in the TaskContext
|
||||
ld ra, 0(sp)
|
||||
# restore ra & s0~s11 of next execution
|
||||
ld ra, 0(a1)
|
||||
.set n, 0
|
||||
.rept 12
|
||||
LOAD_SN %n
|
||||
.set n, n + 1
|
||||
.endr
|
||||
# pop TaskContext
|
||||
addi sp, sp, 13*8
|
||||
# restore kernel stack of next task
|
||||
ld sp, 8(a1)
|
||||
ret
|
||||
|
||||
|
@ -1,8 +1,10 @@
|
||||
global_asm!(include_str!("switch.S"));
|
||||
|
||||
use super::TaskContext;
|
||||
|
||||
extern "C" {
|
||||
pub fn __switch(
|
||||
current_task_cx_ptr2: *const usize,
|
||||
next_task_cx_ptr2: *const usize
|
||||
current_task_cx_ptr: *mut TaskContext,
|
||||
next_task_cx_ptr: *const TaskContext
|
||||
);
|
||||
}
|
||||
|
Loading…
Reference in new issue