feat: No more kernel page table switching upon interrupt.

[lunaix-os.git] / lunaix-os / kernel / asm / x86 / interrupts.c

diff --git a/lunaix-os/kernel/asm/x86/interrupts.c b/lunaix-os/kernel/asm/x86/interrupts.c
index 39682a38a2c850e8df3b1e4a7dee6da55eec347c..55d7e9b9a1e1002773b7d4ce8303c11bc2c24b1c 100644 (file)
--- a/lunaix-os/kernel/asm/x86/interrupts.c
+++ b/lunaix-os/kernel/asm/x86/interrupts.c
@@ -1,17 +1,79 @@
 #include <arch/x86/interrupts.h>
-#include <libc/stdio.h>
+#include <hal/apic.h>
+#include <hal/cpu.h>
+#include <lunaix/syslog.h>
+#include <lunaix/tty/tty.h>
+#include <lunaix/process.h>
+#include <lunaix/sched.h>
+#include <lunaix/mm/page.h>
+#include <lunaix/mm/vmm.h>
 
-void isr0 (isr_param* param) {
-    tty_clear();
-    printf("[PANIC] Exception (%d) CS=0x%X, EIP=0x%X", param->vector, param->cs, param->eip);
+LOG_MODULE("intr")
+
+static int_subscriber subscribers[256];
+
+static int_subscriber fallback = (int_subscriber) 0;
+
+void
+intr_subscribe(const uint8_t vector, int_subscriber subscriber) {
+    subscribers[vector] = subscriber;
+}
+
+void
+intr_unsubscribe(const uint8_t vector, int_subscriber subscriber) {
+    if (subscribers[vector] == subscriber) {
+        subscribers[vector] = (int_subscriber) 0;
+    }
+}
+
+void
+intr_set_fallback_handler(int_subscriber subscribers) {
+    fallback = subscribers;
 }
 
-void 
-interrupt_handler(isr_param* param) {
-    switch (param->vector)
-    {
-        case 0:
-            isr0(param);
-            break;
+extern x86_page_table* __kernel_ptd;
+
+void
+intr_handler(isr_param* param)
+{
+    __current->intr_ctx = *param;
+    
+#ifdef USE_KERNEL_PT
+    cpu_lcr3(__kernel_ptd);
+
+    vmm_mount_pd(PD_MOUNT_1, __current->page_table);
+#endif
+
+    isr_param *lparam = &__current->intr_ctx;
+    
+    if (lparam->vector <= 255) {
+        int_subscriber subscriber = subscribers[lparam->vector];
+        if (subscriber) {
+            subscriber(param);
+            goto done;
+        }
+    }
+
+    if (fallback) {
+        fallback(lparam);
+        goto done;
+    }
+    
+    kprint_panic("INT %u: (%x) [%p: %p] Unknown",
+            lparam->vector,
+            lparam->err_code,
+            lparam->cs,
+            lparam->eip);
+
+done:
+    // for all external interrupts except the spurious interrupt
+    //  this is required by Intel Manual Vol.3A, section 10.8.1 & 10.8.5
+    if (lparam->vector >= EX_INTERRUPT_BEGIN && lparam->vector != APIC_SPIV_IV) {
+        apic_done_servicing();
     }
+
+#ifdef USE_KERNEL_PT
+    cpu_lcr3(__current->page_table);
+#endif
+    return;
 }
\ No newline at end of file