增加一个从c语言使用x86_64中sysret指令的接口

2024-02-18 03:54:48 +08:00 · 2024-02-18 03:54:48 +08:00 · 0613dadeaf
parent 5bd549328f
commit 0613dadeaf
2 changed files with 7 additions and 0 deletions
--- a/src/kernel/arch/x86_64/entry.s
+++ b/src/kernel/arch/x86_64/entry.s
@ -26,6 +26,9 @@ init64:
    lea rax, [systemcall_procedure]
    wrmsr

+    ; 加载中断相关寄存器
+    ; 需要加载寄存器IA32_INTERRUPT_SSP_TABLE
+
    jmp kmain

    section .multiboot2 align=8
--- a/src/kernel/arch/x86_64/syscall_x86_64.s
+++ b/src/kernel/arch/x86_64/syscall_x86_64.s
@ -50,6 +50,10 @@ set_kernel_stack_cache:
    pop rax
    ret

+; void return_from_systemcall()
+return_from_systemcall:
+    sysret
+
 save_kernel_stack:
    endbr64
    lea rbx, [kernel_stack_cache]