Started implementing debugging facilities

arch/x86_64/extra.mk

@@ -1,4 +1,5 @@
 QEMU := qemu-system-x86_64
+QEMU_FLAGS := -m 64M -smp 4
 
 ARCH_TEMP_FILES := $(BUILDDIR)/$(KERNEL_EXEC).elf32
 
@@ -16,8 +17,13 @@ run: $(BUILDDIR)/$(KERNEL_EXEC) $(BUILDDIR)/$(KERNEL_EXEC).elf32
 	@$(QEMU) -kernel $(BUILDDIR)/$(KERNEL_EXEC).elf32
 
 debug: $(BUILDDIR)/$(KERNEL_EXEC) $(BUILDDIR)/$(KERNEL_EXEC).elf32
-	@echo "    \033[1;93mBOOT\033[0m   $<"
+	@echo "    \033[1;93mDEBUG\033[0m  $<"
+
+	@./tools/kernel-debug/debug_session.sh \
+		tools/kernel-debug/gdb_session_init \
+		tools/kernel-debug/lldb_session_init \
+		$(QEMU) \
+			-kernel $(BUILDDIR)/$(KERNEL_EXEC).elf32 -S -s \
+			-curses -serial file:socks.log $(QEMU_FLAGS)
+
 
-	@$(QEMU) \
-		-kernel $(BUILDDIR)/$(KERNEL_EXEC).elf32 -S -s \
-		-monitor stdio

arch/x86_64/start_32.S

@@ -55,7 +55,7 @@ bootstrap_pdpt:		# a single PDPT
 bootstrap_pdir_buf:	# a buffer of page directories. each pdir entry can be used to map 2MB of virtual memory.
 	.skip BOOTSTRAP_PDIR_SIZE
 bootstrap_stack_bottom:
-	.skip 0x1000
+	.skip 0x4000
 bootstrap_stack_top:
 
 /*******
@@ -260,7 +260,8 @@ long_mode_switch:
 _start:
 	mov $bootstrap_stack_top, %esp
 
-	push %ebx			# store the pointer to the multiboot info block.
+	push %ebx			# store the pointer to the multiboot info block as a 64-bit value.
+	push $0x00			# store the pointer to the multiboot info block as a 64-bit value.
 
 	# check if long mode is supported
 	movl $0x80000000, %eax		# Extended-function 80000000h.

arch/x86_64/start_64.S

@@ -1,5 +1,7 @@
 .code64
 
+.extern kernel_init			# defined in core/main.c
+
 .section .boot.rodata, "a", @progbits
 
 /*******
@@ -63,7 +65,11 @@ print_kernel_identifier:
 .type start_64, @function
 start_64:
 	call vga_clear
+
+	pop %rax
 	call print_kernel_identifier
 
+	call kernel_init
+
 	cli
 	hlt