Architectural Support: x86_64 (#37)

[lunaix-os.git] / lunaix-os / arch / x86 / boot / i386 / prologue32.S

diff --git a/lunaix-os/arch/x86/boot/i386/prologue32.S b/lunaix-os/arch/x86/boot/i386/prologue32.S
new file mode 100644 (file)
index 0000000..b8b4866
--- /dev/null
+++ b/lunaix-os/arch/x86/boot/i386/prologue32.S
@@ -0,0 +1,79 @@
+/* 高半核入口点 - 0xC0000000 */
+
+#define __ASM__
+#include <sys/abi.h>
+#include <sys/failsafe.h>
+
+.section .bss.kstack
+    .global __kinit_stack_end
+    
+    .align 16
+    __kinit_stack_end:
+        .skip 2048, 0
+    __kinit_stack_top:
+
+
+.section .text
+    .global hhk_entry_
+    hhk_entry_:
+        /*
+            欢迎来到虚拟内存的世界！ :D
+         */
+        movl $__kinit_stack_top, %esp
+        andl $stack_alignment, %esp
+
+        movl $__kinit_stack_end, %eax
+        movl $STACK_SANITY, (%eax)
+        movl $STACK_SANITY, 4(%eax)
+        movl $STACK_SANITY, 8(%eax)
+        movl $STACK_SANITY, 12(%eax)
+
+        subl $16, %esp
+
+        /* 
+            加载 GDT 
+            P.s. 虽然GDT在分页后已变得不重要，甚至可以忽略不作。但为了保持完整性，还是选择加载他
+                    这主要是为了保险起见，让GDTR有一个合法的值，否则多咱的粗心大意，容易出#GP
+        */
+        call _init_gdt
+
+        movl $_gdt, 2(%esp)
+        movw _gdt_limit, %ax
+        movw %ax, (%esp)
+        lgdt (%esp)
+
+        /* 更新段寄存器 */
+        movw $KDATA_SEG, %cx
+        movw %cx, %es
+        movw %cx, %ds
+        movw %cx, %fs
+        movw %cx, %gs
+        movw %cx, %ss
+        
+        /* 更新 CS:EIP */
+        pushl $KCODE_SEG
+        pushl $_after_gdt
+        retf
+
+    _after_gdt:
+        subl $16, %esp
+
+        # 加载 IDT
+        movl $_idt, 2(%esp)
+        movw _idt_limit, %ax
+        movw %ax, (%esp)
+        lidt (%esp)
+
+        # perform arch-specific initialization before diving into kernel
+        call arch_preinit
+
+        /* 加载TSS段选择器 */
+        movw $TSS_SEG, %ax
+        ltr %ax
+
+        movl $bhctx_buffer, (%esp)       # mb_parser.c
+        call kernel_bootstrap
+
+    1:
+        hlt
+        jmp 1b
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