diff --git a/src/kernel/cpu/cpu_error.c b/src/kernel/cpu/cpu_error.c
index e12143bb..116c806a 100755
--- a/src/kernel/cpu/cpu_error.c
+++ b/src/kernel/cpu/cpu_error.c
@@ -1,9 +1,9 @@
 #include <kernel.h>
 
-inthandler_f error_inthandler;
-inthandler_f ERROR7;
-inthandler_f ERROR13;
-inthandler_f irq13;
+static inthandler_f error_inthandler;
+static inthandler_f ERROR7;
+static inthandler_f ERROR13;
+static inthandler_f irq13;
 
 void fpu_disable() {
   asm_set_ts, asm_set_em;
@@ -69,7 +69,7 @@ static const struct {
     [31] = {"--", "Reserved"                      },
 };
 
-void error_inthandler(i32 id, regs32 *regs) {
+__attr(fastcall) void error_inthandler(i32 id, regs32 *regs) {
   kassert(id >= 0);
   kassert(id < 32);
   kassert(regs != null);
@@ -78,11 +78,11 @@ void error_inthandler(i32 id, regs32 *regs) {
   abort();
 }
 
-void ERROR7(i32 id, regs32 *reg) {
+__attr(fastcall) void ERROR7(i32 id, regs32 *reg) {
   fpu_enable(current_task);
 }
 
-void irq13(i32 id, regs32 *reg) {
+__attr(fastcall) void irq13(i32 id, regs32 *reg) {
   kloge("IRQ 13 should not be triggered");
   fpu_enable(current_task);
 }
@@ -105,7 +105,7 @@ extern byte *IVT;
 
 extern task_t v86_using_task;
 
-void ERROR13(i32 id, regs32 *regs) {
+__attr(fastcall) void ERROR13(i32 id, regs32 *regs) {
   const var frame = regs;
   const var task  = current_task;
   if (current_task->v86_mode != 1) {
diff --git a/src/kernel/drivers/general/timer.c b/src/kernel/drivers/general/timer.c
index fba7ea61..1191192e 100755
--- a/src/kernel/drivers/general/timer.c
+++ b/src/kernel/drivers/general/timer.c
@@ -37,7 +37,7 @@ void sleep(uint64_t time_s) {
   //   } while (now_time.sec < end_time.sec || now_time.nsec < end_time.nsec);
 }
 
-static void inthandler20(i32 id, regs32 *regs) {
+__attr(fastcall) void inthandler20(i32 id, regs32 *regs) {
   // gettime_ns(NULL); // 更新时间
 
   system_tick++;
diff --git a/src/kernel/drivers/input/keyboard.c b/src/kernel/drivers/input/keyboard.c
index 922b1932..05e1af1f 100755
--- a/src/kernel/drivers/input/keyboard.c
+++ b/src/kernel/drivers/input/keyboard.c
@@ -112,7 +112,7 @@ static int sc2a(int sc) {
 int    disable_flag      = 0;
 task_t keyboard_use_task = NULL;
 
-static void inthandler21(i32 id, regs32 *regs) {
+__attr(fastcall) void inthandler21(i32 id, regs32 *regs) {
   // 键盘中断处理函数
   u8 data, s[4];
   asm_out8(PIC0_OCW2, 0x61);
diff --git a/src/kernel/drivers/input/mouse.c b/src/kernel/drivers/input/mouse.c
index 57b4af1a..12daf9fb 100755
--- a/src/kernel/drivers/input/mouse.c
+++ b/src/kernel/drivers/input/mouse.c
@@ -112,7 +112,7 @@ u32 m_cr3 = 0;
 u32 m_eip = 0;
 u32 times = 0;
 
-static void inthandler2c(i32 id, regs32 *regs) {
+__attr(fastcall) void inthandler2c(i32 id, regs32 *regs) {
   byte data = asm_in8(PORT_KEYDAT);
 
   klogd("mouse data=%02x\n", data);
diff --git a/src/kernel/drivers/sound/hda.c b/src/kernel/drivers/sound/hda.c
index 2ddf30c1..26633788 100755
--- a/src/kernel/drivers/sound/hda.c
+++ b/src/kernel/drivers/sound/hda.c
@@ -630,7 +630,7 @@ static int hda_open(vsound_t vsound) {
   return 0;
 }
 
-static void hda_interrupt_handler(i32 id, regs32 *regs) {
+__attr(fastcall) void hda_interrupt_handler(i32 id, regs32 *regs) {
   // printf("hda interrupt has been called");
   if (hda_stopping) {
     hda_stop();
diff --git a/src/kernel/drivers/sound/sb16.c b/src/kernel/drivers/sound/sb16.c
index accb736f..3ac70a45 100755
--- a/src/kernel/drivers/sound/sb16.c
+++ b/src/kernel/drivers/sound/sb16.c
@@ -138,7 +138,7 @@ static vsound_t snd;
 
 static inthandler_f sb16_handler;
 
-static void sb16_handler(i32 id, regs32 *regs) {
+__attr(fastcall) void sb16_handler(i32 id, regs32 *regs) {
   asm_in8(sb.depth == 16 ? SB_INTR16 : SB_STATE);
 
 #if VSOUND_RWAPI
diff --git a/src/kernel/drivers/storage/fdc.c b/src/kernel/drivers/storage/fdc.c
index 0a33481e..6a9c47a2 100755
--- a/src/kernel/drivers/storage/fdc.c
+++ b/src/kernel/drivers/storage/fdc.c
@@ -87,7 +87,7 @@ static void Write(int drive, byte *buffer, uint number, uint lba) {
 
 static inthandler_f flint;
 
-static void flint(i32 id, regs32 *regs) {
+__attr(fastcall) void flint(i32 id, regs32 *regs) {
   floppy_int_count = 1; // 设置中断计数器为1，代表中断已经发生（或者是系统已经收到了中断）
   asm_out8(0x20, 0x20); // 发送EOI信号，告诉PIC，我们已经处理完了这个中断
   // task_run(waiter);
diff --git a/src/kernel/drivers/storage/ide.c b/src/kernel/drivers/storage/ide.c
index 9aa1aa4b..4e1bb58e 100755
--- a/src/kernel/drivers/storage/ide.c
+++ b/src/kernel/drivers/storage/ide.c
@@ -549,7 +549,7 @@ void ide_wait_irq() {
   ide_irq_invoked = 0;
 }
 
-static void ide_irq(i32 id, regs32 *regs) {
+__attr(fastcall) void ide_irq(i32 id, regs32 *regs) {
   klog("ide irq.");
   ide_irq_invoked = 1;
 }
diff --git a/src/kernel/mm/vpage.c b/src/kernel/mm/vpage.c
index d3a57333..04023b90 100755
--- a/src/kernel/mm/vpage.c
+++ b/src/kernel/mm/vpage.c
@@ -657,7 +657,7 @@ void page_set_physics_attr_pde(u32 vaddr, void *paddr, u32 attr, u32 pde_backup)
 
 extern TSS32 tss;
 
-static void page_fault(i32 id, regs32 *regs) {
+__attr(fastcall) void page_fault(i32 id, regs32 *regs) {
   asm_cli;
   u32 pde = current_task->pde;
   asm_set_cr3(PDE_ADDRESS); // 设置一个安全的页表