Further celanup and a little modularization

1 files changed, 115 insertions, 0 deletions

diff --git a/kernel/interrupts.c b/kernel/interrupts.c
new file mode 100644
index 0000000..198822e
--- /dev/null
+++ b/kernel/interrupts.c
@@ -0,0 +1,115 @@
+#include "interrupts.h"
+
+// the interrupt descriptor table
+static struct int_desc
+{
+    uint16_t addrLo;
+    uint16_t sel;
+    uint8_t zeros;
+    uint8_t flags;
+    uint16_t addrHi;
+
+} idt[INT_MAX];
+
+// interrupt descriptor table descriptor
+static struct idt_desc
+{
+    uint16_t size;
+    uint16_t baseLo;
+    uint16_t baseHi;
+
+} idtd;
+
+// disable interrupts
+void int_disable()
+{
+    __asm__("cli");
+}
+
+// enable interrupts
+void int_enable()
+{
+    __asm__("sti");
+}
+
+
+// default handler
+void int_def_handler()
+{
+    __asm__("pusha");
+
+    int_unhandled++;
+
+    // todo also the other pic!// TODO
+    __asm__("mov $0x20, %al");
+    __asm__("out %al, $0x20");
+
+    __asm__("popa");
+    __asm__("leave");
+    __asm__("iret");
+
+}
+
+
+//set a handler for a specific interrupt
+void int_install_ir(int irq, uint16_t flags, uint16_t sel, void *addr)
+{
+
+    uint64_t base=(uint64_t)&(*addr);	// TODO!
+
+    idt[irq].addrLo = base & 0xffff;
+    idt[irq].addrHi = (base >> 16) & 0xffff;
+    idt[irq].addrHi =  0x0;
+    idt[irq].zeros=0;
+    idt[irq].flags=flags;
+    idt[irq].sel=sel;
+
+}
+
+// set default handler for all interrupts for a start
+void int_init(uint16_t sel)
+{
+    int i;
+    for(i=0; i<INT_MAX; i++)
+    {
+	int_install_ir(i, 0b10001110, sel,&int_def_handler);
+    }
+
+}
+
+void int_install()
+{
+
+    idtd.size=8*34;	//TODO
+    idtd.baseHi=0x0000;
+    idtd.baseLo=&idt[0];
+
+    __asm__("lidt %0"::"m" (idtd));
+
+}
+/*
+//print interrupt table; //TODO!
+void int_show()
+{
+    uint16_t *ptr3=&idt[0]; // TODO!
+
+    scr_put_string("idt located: ");
+    scr_put_hex(ptr3);
+    scr_nextline();
+
+
+    // first two bytes as chars
+    int offset;
+    for(offset=32;offset<40;offset++)
+    {
+	print_hex(offset-32); //irq
+	print_string(" -> ");
+	print_hex(*(ptr3+offset*4)); //addrLo
+	print_hex(*(ptr3+1+offset*4)); //sel
+	print_hex(*(ptr3+2+offset*4)); //zeros & flags
+	print_hex(*(ptr3+3+offset*4)); //addrHi
+	print_nextline();
+    }
+}
+*/
+