a lot of kernel work

4 files changed, 92 insertions, 2 deletions

diff --git a/kernel/include/gdt.h b/kernel/include/gdt.h
index e93c92a..4cf7c4f 100644
--- a/kernel/include/gdt.h
+++ b/kernel/include/gdt.h
@@ -10,7 +10,7 @@ struct gdt_entry {
 } __attribute__((packed));
 
 struct gdt_ptr {
-    uint8_t limit;
+    uint16_t limit;
     uint32_t base;
 } __attribute__((packed));
 
@@ -18,6 +18,6 @@ struct gdt_entry gdt[3];
 struct gdt_ptr gp;
 
 /* assembly */
-extern void gdt_flush(struct gdt_ptr*);
+extern void gdt_flush(uint32_t);
 
 void gdt_init(void);
diff --git a/kernel/include/idt.h b/kernel/include/idt.h
new file mode 100644
index 0000000..8041025
--- /dev/null
+++ b/kernel/include/idt.h
@@ -0,0 +1,23 @@
+#include <stdint.h>
+
+struct idt_entry {
+    uint16_t base_lo;
+    uint16_t sel;
+    uint8_t zero;
+    uint8_t flags;
+    uint16_t base_hi;
+} __attribute__((packed));
+
+struct idt_ptr {
+    uint16_t limit;
+    uint32_t base;
+};
+
+struct idt_entry idt[0x100];
+struct idt_ptr idt_pt;
+
+void idt_init(void);
+
+extern void idt_flush(uint32_t);
+
+void idt_set_gate(uint8_t idx, uint32_t base, uint16_t sel, uint8_t flags);
diff --git a/kernel/include/irq.h b/kernel/include/irq.h
new file mode 100644
index 0000000..1dcbc17
--- /dev/null
+++ b/kernel/include/irq.h
@@ -0,0 +1,21 @@
+extern void _irq0(void);
+extern void _irq1(void);
+extern void _irq2(void);
+extern void _irq3(void);
+extern void _irq4(void);
+extern void _irq5(void);
+extern void _irq6(void);
+extern void _irq7(void);
+extern void _irq8(void);
+extern void _irq9(void);
+extern void _irq10(void);
+extern void _irq11(void);
+extern void _irq12(void);
+extern void _irq13(void);
+extern void _irq14(void);
+extern void _irq15(void);
+
+struct regs_t;
+
+void irq_set_handler(int irq, void (*handler)(struct regs_t*));
+void irq_init(void);
diff --git a/kernel/include/isr.h b/kernel/include/isr.h
new file mode 100644
index 0000000..d3543af
--- /dev/null
+++ b/kernel/include/isr.h
@@ -0,0 +1,46 @@
+#include <stdint.h>
+
+/* these are all implemented in isr-as.S */
+extern void _isr0(void);
+extern void _isr1(void);
+extern void _isr2(void);
+extern void _isr3(void);
+extern void _isr4(void);
+extern void _isr5(void);
+extern void _isr6(void);
+extern void _isr7(void);
+extern void _isr8(void);
+extern void _isr9(void);
+extern void _isr10(void);
+extern void _isr11(void);
+extern void _isr12(void);
+extern void _isr13(void);
+extern void _isr14(void);
+extern void _isr15(void);
+extern void _isr16(void);
+extern void _isr17(void);
+extern void _isr18(void);
+extern void _isr19(void);
+extern void _isr20(void);
+extern void _isr21(void);
+extern void _isr22(void);
+extern void _isr23(void);
+extern void _isr24(void);
+extern void _isr25(void);
+extern void _isr26(void);
+extern void _isr27(void);
+extern void _isr28(void);
+extern void _isr29(void);
+extern void _isr30(void);
+extern void _isr31(void);
+
+/* installs all the ISR's */
+void isr_init(void);
+
+/* This defines what the stack looks like after an ISR was running */
+struct regs_t {
+    uint32_t gs, fs, es, ds;      /* pushed the segs last */
+    uint32_t edi, esi, ebp, esp, ebx, edx, ecx, eax;  /* pushed by 'pusha' */
+    uint32_t int_no, err_code;    /* our 'push byte #' and ecodes do this */
+    uint32_t eip, cs, eflags, useresp, ss;   /* pushed by the processor automatically */
+};