Kernel: Unify IDT and GDT code between x86_64 and x86_32

The code is pretty much the same, so there are just couple macros
differiating initialization.

kernel/arch/i686/GDT.cpp

@@ -1,21 +0,0 @@
-#include <kernel/GDT.h>
-
-namespace Kernel
-{
-
-	GDT* GDT::create()
-	{
-		ASSERT_NOT_REACHED();
-	}
-
-	void GDT::write_entry(uint8_t, uint32_t, uint32_t, uint8_t, uint8_t)
-	{
-		ASSERT_NOT_REACHED();
-	}
-
-	void GDT::write_tss()
-	{
-		ASSERT_NOT_REACHED();
-	}
-
-}

kernel/arch/i686/IDT.cpp

@@ -1,31 +0,0 @@
-#include <kernel/IDT.h>
-
-namespace Kernel
-{
-
-	IDT* IDT::create()
-	{
-		ASSERT_NOT_REACHED();
-	}
-
-	[[noreturn]] void IDT::force_triple_fault()
-	{
-		ASSERT_NOT_REACHED();
-	}
-
-	void IDT::register_irq_handler(uint8_t, Interruptable*)
-	{
-		ASSERT_NOT_REACHED();
-	}
-
-	void IDT::register_interrupt_handler(uint8_t, void (*)())
-	{
-		ASSERT_NOT_REACHED();
-	}
-
-	void IDT::register_syscall_handler(uint8_t, void (*)())
-	{
-		ASSERT_NOT_REACHED();
-	}
-
-}

kernel/arch/i686/interrupts.S

@@ -0,0 +1,134 @@
+isr_stub:
+	ud2
+	pusha
+	call cpp_isr_handler
+	popa
+	iret
+
+irq_stub:
+	ud2
+	pusha
+	call cpp_irq_handler
+	popa
+	iret
+
+// arguments in EAX, EBX, ECX, EDX, ESI, EDI
+.global syscall_asm
+syscall_asm:
+	ud2
+	pusha
+
+	pushl %esp
+	addl $36, (%esp)
+
+	pushl %edi
+	pushl %esi
+	pushl %edx
+	pushl %ecx
+	pushl %ebx
+	pushl %eax
+
+	call cpp_syscall_handler
+
+	addl $60, %esp
+
+	popl %edi
+	popl %esi
+	popl %ebp
+	addl $4, %esp
+	popl %ebx
+	popl %edx
+	popl %ecx
+	addl $4, %esp
+
+	iret
+
+.macro isr n
+	.global isr\n
+	isr\n:
+		pushl $0
+		pushl $\n
+		jmp isr_stub
+.endm
+
+.macro isr_err n
+	.global isr\n
+	isr\n:
+		pushl $\n
+		jmp isr_stub
+.endm
+
+.macro irq n
+	.global irq\n
+	irq\n:
+		pushl $0
+		pushl $\n
+		jmp irq_stub
+.endm
+
+isr 0
+isr 1
+isr 2
+isr 3
+isr 4
+isr 5
+isr 6
+isr 7
+isr_err 8
+isr 9
+isr_err 10
+isr_err 11
+isr_err 12
+isr_err 13
+isr_err 14
+isr 15
+isr 16
+isr_err 17
+isr 18
+isr 19
+isr 20
+isr 21
+isr 22
+isr 23
+isr 24
+isr 25
+isr 26
+isr 27
+isr 28
+isr 29
+isr 30
+isr 31
+
+irq 0
+irq 1
+irq 2
+irq 3
+irq 4
+irq 5
+irq 6
+irq 7
+irq 8
+irq 9
+irq 10
+irq 11
+irq 12
+irq 13
+irq 14
+irq 15
+irq 16
+irq 17
+irq 18
+irq 19
+irq 20
+irq 21
+irq 22
+irq 23
+irq 24
+irq 25
+irq 26
+irq 27
+irq 28
+irq 29
+irq 30
+irq 31
+irq 32