2016-06-16 18:50:03 +00:00
|
|
|
.code32
|
|
|
|
|
.section multiboot
|
|
|
|
|
#define MB_MAGIC 0x1BADB002
|
2016-06-17 19:39:43 +00:00
|
|
|
#define MB_FLAGS 0x7
|
2016-06-16 18:50:03 +00:00
|
|
|
#define MB_CHECKSUM -(MB_MAGIC + MB_FLAGS)
|
|
|
|
|
.align 4
|
|
|
|
|
.int MB_MAGIC
|
|
|
|
|
.int MB_FLAGS
|
|
|
|
|
.int MB_CHECKSUM
|
2016-06-17 19:39:43 +00:00
|
|
|
.int 0,0,0,0,0
|
|
|
|
|
.int 0
|
|
|
|
|
.int 1024, 768, 32
|
2016-06-16 18:50:03 +00:00
|
|
|
.section .text
|
|
|
|
|
.extern init
|
|
|
|
|
.global _start
|
|
|
|
|
_start:
|
2016-06-17 19:39:43 +00:00
|
|
|
finit
|
2016-06-16 18:50:03 +00:00
|
|
|
mov $mb_ptr, %edi
|
|
|
|
|
stosl
|
|
|
|
|
mov %ebx, %eax
|
|
|
|
|
stosl //Temponarily store both multiboot header pointer and multiboot
|
|
|
|
|
mov $kernel_stack, %esp
|
|
|
|
|
mov $0x80000001, %eax //Check if Long Mode is supported
|
|
|
|
|
cpuid
|
|
|
|
|
and $0x20000000, %edx
|
|
|
|
|
jz x86_64_err
|
|
|
|
|
|
|
|
|
|
xor %eax, %eax //Check if PAE is supported
|
|
|
|
|
inc %eax
|
|
|
|
|
cpuid
|
|
|
|
|
and $0x40, %dl
|
|
|
|
|
jz x86_64_err
|
|
|
|
|
jmp x86_64_OK
|
|
|
|
|
x86_64_err:
|
|
|
|
|
cli
|
|
|
|
|
hlt
|
|
|
|
|
jmp x86_64_err
|
|
|
|
|
x86_64_OK:
|
|
|
|
|
//Fill one entry of both the pagemap L4 and the Pagedir PT
|
|
|
|
|
mov $pmfill, %esi
|
|
|
|
|
mov $pagemapL4, %edi
|
|
|
|
|
lodsl
|
|
|
|
|
stosl
|
|
|
|
|
lodsl
|
|
|
|
|
stosl
|
|
|
|
|
mov $pagedirPT, %edi
|
|
|
|
|
lodsl
|
|
|
|
|
stosl
|
|
|
|
|
lodsl
|
|
|
|
|
stosl
|
|
|
|
|
//Activate PAE
|
|
|
|
|
mov %cr4, %eax
|
|
|
|
|
or $0x20, %al
|
|
|
|
|
mov %eax, %cr4
|
|
|
|
|
//Activate x86_64
|
|
|
|
|
mov $0xC0000080, %ecx
|
|
|
|
|
rdmsr
|
|
|
|
|
or $0x00000100, %eax
|
|
|
|
|
wrmsr
|
|
|
|
|
//Load Page Table
|
|
|
|
|
mov $pagemapL4, %eax
|
|
|
|
|
mov %eax, %cr3
|
|
|
|
|
//Activate Paging
|
|
|
|
|
mov %cr0, %eax
|
|
|
|
|
bswap %eax
|
|
|
|
|
or $0x80, %al
|
|
|
|
|
bswap %eax
|
|
|
|
|
mov %eax, %cr0
|
|
|
|
|
//Jump to x86_64loader
|
|
|
|
|
lgdt gdtr
|
|
|
|
|
jmp $0x18, $start
|
|
|
|
|
|
|
|
|
|
.code64
|
|
|
|
|
//extern "C" void init(uint32_t eax, multiboot_info * ebx, uint64_t **** pt);
|
|
|
|
|
.global init
|
|
|
|
|
start:
|
|
|
|
|
xor %rax, %rax
|
|
|
|
|
mov $mb_ptr, %rsi
|
|
|
|
|
lodsl
|
|
|
|
|
mov %rax, %rdi
|
|
|
|
|
lodsl
|
|
|
|
|
mov %rax, %rsi
|
|
|
|
|
mov $pagemapL4, %rdx
|
|
|
|
|
call init
|
|
|
|
|
stop:
|
|
|
|
|
cli
|
|
|
|
|
hlt
|
|
|
|
|
jmp stop
|
|
|
|
|
.section .data
|
|
|
|
|
gdt:
|
|
|
|
|
//NULL-descriptor
|
|
|
|
|
.quad 0
|
|
|
|
|
//32-bit code
|
|
|
|
|
.word 0xFFFF
|
|
|
|
|
.word 0x0000
|
|
|
|
|
.byte 0x00
|
|
|
|
|
.byte 0x98
|
|
|
|
|
.byte 0xCF
|
|
|
|
|
.byte 0x00
|
|
|
|
|
//data
|
|
|
|
|
.word 0xFFFF
|
|
|
|
|
.word 0x0000
|
|
|
|
|
.byte 0x00
|
|
|
|
|
.byte 0x92
|
|
|
|
|
.byte 0xCF
|
|
|
|
|
.byte 00
|
|
|
|
|
//64-bit code
|
|
|
|
|
.int 0
|
|
|
|
|
.byte 0
|
|
|
|
|
.byte 0x98
|
|
|
|
|
.byte 0x20
|
|
|
|
|
.byte 0
|
|
|
|
|
|
|
|
|
|
gdtr:
|
|
|
|
|
.word 4 * 8
|
|
|
|
|
.int gdt
|
|
|
|
|
pmfill:
|
|
|
|
|
.int pagedirPT + 0x7
|
|
|
|
|
.int 0
|
|
|
|
|
pdptfill:
|
|
|
|
|
.quad 0x87
|
|
|
|
|
.section .bss
|
|
|
|
|
mb_ptr:
|
|
|
|
|
// These 8 Bytes will never be used when the stack comes near it
|
|
|
|
|
.space 4096
|
|
|
|
|
kernel_stack:
|
|
|
|
|
.align 4096
|
|
|
|
|
pagemapL4:
|
|
|
|
|
.space 4096
|
|
|
|
|
pagedirPT:
|
|
|
|
|
.space 4096
|
