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Line 64... Line 64...
64 
	bt $29, %edx 		# Test if long mode is supported.
 64 
	bt $29, %edx 		# Test if long mode is supported.
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	jnc no_long_mode
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	jnc no_long_mode
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	# Load gdtr, idtr
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	# Load gdtr, idtr
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	lgdt gdtr_inst
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	lgdt gdtr_inst
- 
 
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	# Load idtr, but it contains mess - we should not get interrupt
- 
 
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	# anyway
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	lidt idtr_inst
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	lidt idtr_inst
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	movl %cr0,%eax
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	movl %cr0,%eax
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	orl $0x1,%eax
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	orl $0x1,%eax
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	movl %eax,%cr0			# switch to protected mode
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	movl %eax,%cr0			# switch to protected mode
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	jmpl $selector(KTEXT32_DES), $now_in_prot
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	jmpl $gdtselector(KTEXT32_DES), $now_in_prot
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no_long_mode:
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no_long_mode:
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1:
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1:
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	jmp 1b
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	jmp 1b
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# Protected 16-bit. We want to reuse the code-seg descriptor,
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# Protected 16-bit. We want to reuse the code-seg descriptor,
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# the Default operand size must not be 1 when entering long mode
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# the Default operand size must not be 1 when entering long mode
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now_in_prot:
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now_in_prot:
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	# Set up stack & data descriptors
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	# Set up stack & data descriptors
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	movw $selector(KDATA_DES), %ax
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	movw $gdtselector(KDATA_DES), %ax
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	movw %ax, %ds
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	movw %ax, %ds
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	movw %ax, %fs
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	movw %ax, %fs
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	movw %ax, %gs
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	movw %ax, %gs
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	movw %ax, %ss
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	movw %ax, %ss
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	movl %cr0, %eax
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	movl %cr0, %eax
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	btsl $31, %eax
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	btsl $31, %eax
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	movl %eax, %cr0
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	movl %eax, %cr0
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	# At this point we are in compatibility mode
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	# At this point we are in compatibility mode
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	jmpl $selector(KTEXT_DES), $start64
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	jmpl $gdtselector(KTEXT_DES), $start64
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.code64
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.code64
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start64:
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start64:
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	movq START_STACK_64, %rsp
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	movq START_STACK_64, %rsp
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	lidt idtr_inst
 - 
 
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- 
 
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	call main_bsp   # never returns
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	call main_bsp   # never returns
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1:
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1:
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	jmp 1b
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	jmp 1b
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 - 
 
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.section K_DATA_START
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.section K_DATA_START
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.align 4096
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.align 4096
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- 
 
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# Identical mapping of first 16MB and the same of -2GB -> 0
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.global ptl_2
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.global ptl_2
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ptl_2:
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ptl_2:
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	.quad 0x0 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x0 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x200000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
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	.quad 0x400000 | (PTL_WRITABLE | PTL_PRESENT | PTL_2MB_PAGE)
Line 151... Line 152...
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	.fill 510,8,0
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	.fill 510,8,0
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	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
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	.quad ptl_1 + (PTL_WRITABLE | PTL_PRESENT)
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.global gdtr_inst
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.global gdtr_inst
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gdtr_inst:
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gdtr_inst:
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	.word selector(GDT_ITEMS)
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	.word gdtselector(GDT_ITEMS)
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	.long KA2PA(gdt)
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	.long KA2PA(gdt)
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.global idtr_inst
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.global idtr_inst
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idtr_inst:
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idtr_inst:
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	.word 0
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	.word idtselector(IDT_ITEMS)
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	.long KA2PA(idt)
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	.long KA2PA(idt)