[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / EnablePaging64.s

#------------------------------------------------------------------------------\r
#\r
# Copyright (c) 2006, Intel Corporation\r
# All rights reserved. This program and the accompanying materials\r
# are licensed and made available under the terms and conditions of the BSD License\r
# which accompanies this distribution.  The full text of the license may be found at\r
# http://opensource.org/licenses/bsd-license.php\r
#\r
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
#\r
# Module Name:\r
#\r
#   EnablePaging64.Asm\r
#\r
# Abstract:\r
#\r
#   AsmEnablePaging64 function\r
#\r
# Notes:\r
#\r
#------------------------------------------------------------------------------\r
\r
     \r
    #.MODEL flat\r
     \r
\r
#------------------------------------------------------------------------------\r
# VOID\r
# EFIAPI\r
# AsmEnablePaging64 (\r
#   IN      UINT16                    CodeSelector,\r
#   IN      UINT64                    EntryPoint,\r
#   IN      UINT64                    Context1,    OPTIONAL\r
#   IN      UINT64                    Context2,    OPTIONAL\r
#   IN      UINT64                    NewStack\r
#   );\r
#------------------------------------------------------------------------------\r
.global _AsmEnablePaging64\r
_AsmEnablePaging64:\r
    cli\r
    movl    $$LongStart, (%esp)\r
    movl    %cr4, %eax\r
    orb     $0x20, %al\r
    movl    %eax, %cr4                  # enable PAE\r
    movl    $0xc0000080, %ecx\r
    rdmsr\r
    orb     $1, %ah                     # set LME\r
    wrmsr\r
    movl    %cr0, %eax\r
    btsl    $31, %eax\r
    movl    %eax, %cr0                  # enable paging\r
    lret\r
LongStart:                              # long mode starts here\r
    .byte   0x67,0x48\r
    movl    (%esp), %ebx                # mov rbx, [esp]\r
    .byte   0x67,0x48\r
    movl    8(%esp), %ecx               # mov rcx, [esp + 8]\r
    .byte   0x67,0x48\r
    movl    0x10(%esp), %edx            # mov rdx, [esp + 10h]\r
    .byte   0x67,0x48\r
    movl    0x18(%esp), %esp            # mov rsp, [esp + 18h]\r
    .byte   0x48\r
    addl    $0x-20, %esp                # add rsp, -20h\r
    call    *%ebx                       # call rbx\r
    jmp     .\r
Commit	Line	Data
878ddf1f	1	#------------------------------------------------------------------------------\r
	2	#\r
	3	# Copyright (c) 2006, Intel Corporation\r
	4	# All rights reserved. This program and the accompanying materials\r
	5	# are licensed and made available under the terms and conditions of the BSD License\r
	6	# which accompanies this distribution. The full text of the license may be found at\r
	7	# http://opensource.org/licenses/bsd-license.php\r
	8	#\r
	9	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	10	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	11	#\r
	12	# Module Name:\r
	13	#\r
	14	# EnablePaging64.Asm\r
	15	#\r
	16	# Abstract:\r
	17	#\r
	18	# AsmEnablePaging64 function\r
	19	#\r
	20	# Notes:\r
	21	#\r
	22	#------------------------------------------------------------------------------\r
	23	\r
	24	\r
	25	#.MODEL flat\r
	26	\r
	27	\r
	28	#------------------------------------------------------------------------------\r
	29	# VOID\r
	30	# EFIAPI\r
	31	# AsmEnablePaging64 (\r
	32	# IN UINT16 CodeSelector,\r
	33	# IN UINT64 EntryPoint,\r
	34	# IN UINT64 Context1, OPTIONAL\r
	35	# IN UINT64 Context2, OPTIONAL\r
	36	# IN UINT64 NewStack\r
	37	# );\r
	38	#------------------------------------------------------------------------------\r
	39	.global _AsmEnablePaging64\r
	40	_AsmEnablePaging64:\r
	41	cli\r
	42	movl $$LongStart, (%esp)\r
	43	movl %cr4, %eax\r
	44	orb $0x20, %al\r
	45	movl %eax, %cr4 # enable PAE\r
	46	movl $0xc0000080, %ecx\r
	47	rdmsr\r
	48	orb $1, %ah # set LME\r
	49	wrmsr\r
	50	movl %cr0, %eax\r
	51	btsl $31, %eax\r
	52	movl %eax, %cr0 # enable paging\r
	53	lret\r
	54	LongStart: # long mode starts here\r
	55	.byte 0x67,0x48\r
	56	movl (%esp), %ebx # mov rbx, [esp]\r
	57	.byte 0x67,0x48\r
	58	movl 8(%esp), %ecx # mov rcx, [esp + 8]\r
	59	.byte 0x67,0x48\r
	60	movl 0x10(%esp), %edx # mov rdx, [esp + 10h]\r
	61	.byte 0x67,0x48\r
	62	movl 0x18(%esp), %esp # mov rsp, [esp + 18h]\r
	63	.byte 0x48\r
	64	addl $0x-20, %esp # add rsp, -20h\r
65	call *%ebx # call rbx\r
66	jmp .\r