feat(idt): add idt creation

Signed-off-by: Julien CLEMENT <julien.clement@epita.fr>

k/Makefile

@@ -31,7 +31,8 @@ OBJS	= \
 	  list.o \
 	  memory.o \
 	  serial.o \
-	  gdt.o
+	  gdt.o \
+	  idt.o
 
 
 DEPS = $(OBJS:.o=.d)

k/gdt.c

@@ -2,7 +2,7 @@
 
 static struct gdt gdt = { 0 };
 
-static void create_kernel_ds()
+static void create_kernel_ds(void)
 {
     struct gdt_entry *entry = gdt.entries + KERNEL_DS_INDEX;
 
@@ -30,7 +30,7 @@ static void create_kernel_ds()
     entry->base_3 = (base >> 24) & 0xff;
 }
 
-static void create_kernel_cs()
+static void create_kernel_cs(void)
 {
     struct gdt_entry *entry = gdt.entries + KERNEL_CS_INDEX;
 
@@ -58,13 +58,13 @@ static void create_kernel_cs()
     entry->base_3 = (base >> 24) & 0xff;
 }
 
-static void create_gdt()
+static void create_gdt(void)
 {
     create_kernel_ds();
     create_kernel_cs();
 }
 
-static void load_gdt()
+static void load_gdt(void)
 {
     struct gdt_r gdtr;
     gdtr.addr = (uint32_t)&gdt;
@@ -76,7 +76,7 @@ static void load_gdt()
             : "memory");
 }
 
-static void load_ds()
+static void load_ds(void)
 {
     struct segment_selector selector;
     selector.index = KERNEL_DS_INDEX;
@@ -93,7 +93,7 @@ static void load_ds()
             : "ax");
 }
 
-static void load_cs()
+static void load_cs(void)
 {
     struct segment_selector selector;
     selector.index = KERNEL_CS_INDEX;
@@ -108,13 +108,13 @@ static void load_cs()
              : "m" (selector));
 }
 
-static void reload_segment_selectors()
+static void reload_segment_selectors(void)
 {
     load_ds();
     load_cs();
 }
 
-void init_gdt()
+void init_gdt(void)
 {
     create_gdt();
     load_gdt();

k/gdt.h

@@ -60,6 +60,6 @@ struct segment_selector
     uint16_t index          : 13; // index of the entry in the table
 } __attribute__ ((packed));
 
-void init_gdt();
+void init_gdt(void);
 
 #endif  /* !GDT_H */

k/idt.c

@@ -2,7 +2,44 @@
 
 static struct idt idt = { 0 };
 
-static void load_idt()
+void handle_interrupt()
+{
+    return;
+}
+
+struct idt_entry create_idt_entry(uint32_t offset,
+                                  struct segment_selector selector)
+{
+    struct idt_entry res = { 0 };
+
+    res.selector = selector;
+    res.offset_1 = offset & 0xffff;
+    res.offset_2 = (offset >> 16) & 0xffff;
+
+    res.type = INTERRUPT_TYPE;
+    res.size = 1;
+    res.desc_priv = 0;
+    res.present = 1;
+
+    return res;
+}
+
+static void create_idt(void)
+{
+    struct segment_selector selector;
+    selector.rpl = 0;
+    selector.table_indicator = 0;
+    selector.index = KERNEL_CS_INDEX;
+    for (int i = 0; i < IDT_NB_ENTRIES; ++i)
+    {
+        struct idt_entry entry = create_idt_entry((uint32_t)&handle_interrupt,
+                                                  selector);
+        idt.entries[i] = entry;
+    }
+}
+
+
+static void load_idt(void)
 {
     struct idt_r idtr;
     idtr.addr = (uint32_t)&idt;
@@ -14,7 +51,8 @@ static void load_idt()
                  : "memory");
 }
 
-void init_idt()
+void init_idt(void)
 {
+    create_idt();
     load_idt();
 }

k/idt.h

@@ -7,6 +7,8 @@
 #define IDT_NB_ENTRIES 32
 #define IDT_SIZE (IDT_NB_ENTRIES * sizeof(struct idt_entry))
 
+#define INTERRUPT_TYPE 0x6
+
 struct idt_entry
 {
     uint16_t offset_1   : 16;
@@ -33,4 +35,6 @@ struct idt_r
     uint32_t addr;
 } __attribute__ ((packed));
 
+void init_idt(void);
+
 #endif  /* !IDT_H */

k/k.c

@@ -23,15 +23,17 @@
  */
 #include <k/kstd.h>
 
-#include "multiboot.h"
-#include "stdio.h"
-#include "serial.h"
 #include "gdt.h"
+#include "idt.h"
+#include "multiboot.h"
+#include "serial.h"
+#include "stdio.h"
 
 static void k_init(void)
 {
     init_serial();
     init_gdt();
+    init_idt();
 }
 
 void k_main(unsigned long magic, multiboot_info_t *info)