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#
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#
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# Copyright (C) 2001-2004 Jakub Jermar
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# Copyright (C) 2001-2004 Ondrej Palkovsky
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# All rights reserved.
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# All rights reserved.
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#
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#
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# Redistribution and use in source and binary forms, with or without
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# modification, are permitted provided that the following conditions
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# are met:
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# are met:
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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- 
 
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#define __ASM__
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#include <arch/mm/page.h>
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#include <arch/mm/ptl.h>
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#include <arch/mm/ptl.h>
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#include <arch/pm.h>
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#define START_STACK     0x7c00
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#define START_STACK     0x7c00
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#define START_STACK_64  $0xffffffff80007c00
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#define START_STACK_64  $0xffffffff80007c00
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#
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#
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	movw %ax,%ss            # initialize stack segment register
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	movw %ax,%ss            # initialize stack segment register
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	movl START_STACK,%esp	# initialize stack pointer
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	movl START_STACK,%esp	# initialize stack pointer
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#	call memmap_arch_init
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#	call memmap_arch_init
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	mov $0x80000000, %eax
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	movl $0x80000000, %eax
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	cpuid
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	cpuid
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	cmp $0x80000000, %eax 	# any function > 80000000h?
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	cmp $0x80000000, %eax 	# any function > 80000000h?
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	jbe no_long_mode
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	jbe no_long_mode
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	mov $0x80000001, %eax	# Extended function code 80000001
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	movl $0x80000001, %eax	# Extended function code 80000001
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	cpuid
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	cpuid
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	bt $29, %edx 		# Test if long mode is supported.
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	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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	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 $40, $now_in_prot
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	jmpl $selector(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 $16, %ax
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	movw $selector(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 $8, $start64
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	jmpl $selector(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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	.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 7*8  # GDT_ITEMS * 8
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	.word selector(GDT_ITEMS)
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	.long gdt + 0x80000000
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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 0
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	.long idt + 0x80000000
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	.long KA2PA(idt)