wip: pic. sending to continue on main pc

kernel/CMakeLists.txt

@@ -12,6 +12,8 @@ add_executable(kernel
     src/entry.asm
     src/asm/interrupts.asm
     src/kmain.c
+    src/modules/io.c
+    src/modules/pic.c
     src/modules/gdt.c
     src/modules/idt.c
     src/modules/interrupts.c

kernel/include/io.h

@@ -1,3 +1,6 @@
+#ifndef IO_H
+#define IO_H
+
 static inline void outb(unsigned short port, unsigned char val) {
     __asm__ volatile( 
         "outb %0, %1" 
@@ -16,3 +19,7 @@ static inline unsigned char inb(unsigned short port) {
 
     return ret;
 }
+
+void io_wait();
+
+#endif

kernel/include/pic.h

@@ -0,0 +1,4 @@
+#ifndef PIC_H
+#define PIC_H
+
+#endif

kernel/include/vmm.h

@@ -19,7 +19,6 @@
 #define PTE_GET_ADDR(entry)  ((entry) & PTE_ADDR_MASK)  // get physical address
 #define PTE_GET_FLAGS(entry) ((entry) & ~PTE_ADDR_MASK) // get flags
 
-
 #define VMM_PT_INDEX(virt)   (((virt) >> 12) & 0x1FF) // Table Index (bits 12-20)
 #define VMM_PD_INDEX(virt)   (((virt) >> 21) & 0x1FF) // Page Directory Index (bits 21-29) 
 #define VMM_PDPT_INDEX(virt) (((virt) >> 30) & 0x1FF) // PDPT Index (bits 30-38)

kernel/src/modules/io.c

@@ -0,0 +1,7 @@
+#include "io.h"
+
+// sending junk to unused port letting cpu skipping few tacts.
+// not ideal i know.
+void io_wait() {
+    outb(0x80, 0x0); 
+}

kernel/src/modules/pic.c

@@ -0,0 +1,32 @@
+#include "pic.h"
+#include "io.h"
+#include "types.h"
+
+#define MASTER_COMMAND 0x20
+#define MASTER_DATA    0x21
+#define SLAVE_COMMAND  0xA0
+#define SLAVE_DATA     0xA1
+
+static inline void send(unsigned short port, unsigned char val) {
+    outb(port, val); 
+    io_wait();
+}
+
+void pic_remap() {
+    u64 curr_master = inb(MASTER_DATA);
+    u64 curr_slave  = inb(SLAVE_DATA);
+
+    // initialization
+    send(MASTER_COMMAND, 0x11);
+    send(SLAVE_COMMAND, 0x11);
+
+    send(MASTER_DATA, 0x20); // master now controlling idt[32..39]
+    send(SLAVE_DATA, 0x28); // idt[40..47]
+
+    send(MASTER_DATA, 0x04); // slave on irq2
+    send(SLAVE_DATA, 0x02); // assign id = 2 to slave
+
+    
+
+    
+}