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Implement fast syscall/sysret for sytem calls

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This commit is contained in:
Justin C. Miller
2019-03-13 23:51:29 -07:00
parent 97e8f2c69a
commit f7558e3d18
9 changed files with 77 additions and 21 deletions
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17
src/kernel/interrupts.s
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@@ -4,38 +4,37 @@ extern isr_handler
global isr_handler_prelude
isr_handler_prelude:
push_all_and_segments
check_swap_gs
mov rdi, rsp
mov rsi, rsp
call isr_handler
mov rsp, rax
pop_all_and_segments
add rsp, 16 ; because the ISRs added err/num
sti
iretq
jmp isr_handler_return
extern irq_handler
global irq_handler_prelude
irq_handler_prelude:
push_all_and_segments
check_swap_gs
mov rdi, rsp
mov rsi, rsp
call irq_handler
mov rsp, rax
; fall through to isr_handler_return
global isr_handler_return
isr_handler_return:
check_swap_gs
pop_all_and_segments
add rsp, 16 ; because the ISRs added err/num
sti
iretq
%macro EMIT_ISR 2
global %1
%1:
cli
push 0
push %2
jmp isr_handler_prelude
@@ -44,7 +43,6 @@ irq_handler_prelude:
%macro EMIT_EISR 2
global %1
%1:
cli
push %2
jmp isr_handler_prelude
%endmacro
@@ -52,7 +50,6 @@ irq_handler_prelude:
%macro EMIT_IRQ 2
global %1
%1:
cli
push 0
push %2
jmp irq_handler_prelude