WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/amd64/src/smp/ap.S


#
# Copyright (C) 2001-2004 Jakub Jermar
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
 
#
# Init code for application processors.
#
 
#include <arch/boot/boot.h>
#include <arch/pm.h>
#include <arch/cpu.h>
#include <arch/cpuid.h>
#include <arch/mm/page.h>
	
.section K_TEXT_START_2, "ax"
 
#ifdef CONFIG_SMP
 
.global ap_boot
 
# This piece of code is real-mode and is meant to be alligned at 4K boundary.
# The requirement for such an alignment comes from MP Specification's STARTUP IPI
# requirements.
 
.align 4096
ap_boot:
.code16
	cli
	xorw %ax, %ax
	movw %ax, %ds
 
	lgdt real_bootstrap_gdtr_boot	# initialize Global Descriptor Table register
	
	movl %cr0, %eax
	orl $1, %eax
	movl %eax, %cr0			# switch to protected mode
	
	jmpl $gdtselector(KTEXT32_DES), $now_in_prot
 
.code32	
now_in_prot:
	movw $gdtselector(KDATA_DES), %ax
	movw %ax, %ds
	movw %ax, %ss
	
 
	# Enable 64-bit page transaltion entries - CR4.PAE = 1.
	# Paging is not enabled until after long mode is enabled
	movl %cr4, %eax
	btsl $5, %eax
	movl %eax, %cr4
 
	# Set up NEW paging tables, that are
	# already moved BOOT_OFFSET up
	leal ptl_0+BOOT_OFFSET, %eax
	movl %eax, %cr3
	
	# Enable long mode
	movl $EFER_MSR_NUM, %ecx   # EFER MSR number
	rdmsr                   # Read EFER
	btsl $AMD_LME_FLAG, %eax            # Set LME=1
	wrmsr                   # Write EFER
	
	# Enable paging to activate long mode (set CR0.PG=1)
	movl %cr0, %eax
	btsl $31, %eax
	movl %eax, %cr0
	
	# At this point we are in compatibility mode
	jmpl $gdtselector(KTEXT_DES), $start64
 
.code64
start64:
	movq (ctx), %rsp
	call main_ap   # never returns
	
	
#endif /* CONFIG_SMP */
 

Rev 501	Rev 532
1	#	1	#
2	# Copyright (C) 2001-2004 Jakub Jermar	2	# Copyright (C) 2001-2004 Jakub Jermar
3	# All rights reserved.	3	# All rights reserved.
4	#	4	#
5	# Redistribution and use in source and binary forms, with or without	5	# Redistribution and use in source and binary forms, with or without
6	# modification, are permitted provided that the following conditions	6	# modification, are permitted provided that the following conditions
7	# are met:	7	# are met:
8	#	8	#
9	# - Redistributions of source code must retain the above copyright	9	# - Redistributions of source code must retain the above copyright
10	# notice, this list of conditions and the following disclaimer.	10	# notice, this list of conditions and the following disclaimer.
11	# - Redistributions in binary form must reproduce the above copyright	11	# - Redistributions in binary form must reproduce the above copyright
12	# notice, this list of conditions and the following disclaimer in the	12	# notice, this list of conditions and the following disclaimer in the
13	# documentation and/or other materials provided with the distribution.	13	# documentation and/or other materials provided with the distribution.
14	# - The name of the author may not be used to endorse or promote products	14	# - The name of the author may not be used to endorse or promote products
15	# derived from this software without specific prior written permission.	15	# derived from this software without specific prior written permission.
16	#	16	#
17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	#	27	#
28		28
29	#	29	#
30	# Init code for application processors.	30	# Init code for application processors.
31	#	31	#
32		32
33	#include <arch/boot/boot.h>	33	#include <arch/boot/boot.h>
34	#include <arch/pm.h>	34	#include <arch/pm.h>
35	#include <arch/cpu.h>	35	#include <arch/cpu.h>
36	#include <arch/cpuid.h>	36	#include <arch/cpuid.h>
37	#include <arch/mm/page.h>	37	#include <arch/mm/page.h>
38		38
39	.section K_TEXT_START_2, "ax"	39	.section K_TEXT_START_2, "ax"
40		40
41	#ifdef CONFIG_SMP	41	#ifdef CONFIG_SMP
42		42
43	.global ap_boot	43	.global ap_boot
44		44
45	# This piece of code is real-mode and is meant to be alligned at 4K boundary.	45	# This piece of code is real-mode and is meant to be alligned at 4K boundary.
46	# The requirement for such an alignment comes from MP Specification's STARTUP IPI	46	# The requirement for such an alignment comes from MP Specification's STARTUP IPI
47	# requirements.	47	# requirements.
48		48
49	.align 4096	49	.align 4096
50	ap_boot:	50	ap_boot:
51	.code16	51	.code16
52	cli	52	cli
53	xorw %ax, %ax	53	xorw %ax, %ax
54	movw %ax, %ds	54	movw %ax, %ds
55		55
56	lgdt real_bootstrap_gdtr_boot # initialize Global Descriptor Table register	56	lgdt real_bootstrap_gdtr_boot # initialize Global Descriptor Table register
57		57
58	movl %cr0, %eax	58	movl %cr0, %eax
59	orl $1, %eax	59	orl $1, %eax
60	movl %eax, %cr0 # switch to protected mode	60	movl %eax, %cr0 # switch to protected mode
61		61
62	jmpl $gdtselector(KTEXT32_DES), $now_in_prot	62	jmpl $gdtselector(KTEXT32_DES), $now_in_prot
63		63
64	.code32	64	.code32
65	now_in_prot:	65	now_in_prot:
66	movw $gdtselector(KDATA_DES), %ax	66	movw $gdtselector(KDATA_DES), %ax
67	movw %ax, %ds	67	movw %ax, %ds
68	movw %ax, %ss	68	movw %ax, %ss
69		69
70		70
71	# Enable 64-bit page transaltion entries - CR4.PAE = 1.	71	# Enable 64-bit page transaltion entries - CR4.PAE = 1.
72	# Paging is not enabled until after long mode is enabled	72	# Paging is not enabled until after long mode is enabled
73	movl %cr4, %eax	73	movl %cr4, %eax
74	btsl $5, %eax	74	btsl $5, %eax
75	movl %eax, %cr4	75	movl %eax, %cr4
76		76
77	# Set up NEW paging tables, that are	77	# Set up NEW paging tables, that are
78	# already moved BOOT_OFFSET up	78	# already moved BOOT_OFFSET up
79	leal ptl_0+BOOT_OFFSET, %eax	79	leal ptl_0+BOOT_OFFSET, %eax
80	movl %eax, %cr3	80	movl %eax, %cr3
81		81
82	# Enable long mode	82	# Enable long mode
83	movl $EFER_MSR_NUM, %ecx # EFER MSR number	83	movl $EFER_MSR_NUM, %ecx # EFER MSR number
84	rdmsr # Read EFER	84	rdmsr # Read EFER
85	btsl $AMD_LME_FLAG, %eax # Set LME=1	85	btsl $AMD_LME_FLAG, %eax # Set LME=1
86	wrmsr # Write EFER	86	wrmsr # Write EFER
87		87
88	# Enable paging to activate long mode (set CR0.PG=1)	88	# Enable paging to activate long mode (set CR0.PG=1)
89	movl %cr0, %eax	89	movl %cr0, %eax
90	btsl $31, %eax	90	btsl $31, %eax
91	movl %eax, %cr0	91	movl %eax, %cr0
92		92
93	# At this point we are in compatibility mode	93	# At this point we are in compatibility mode
94	jmpl $gdtselector(KTEXT_DES), $start64	94	jmpl $gdtselector(KTEXT_DES), $start64
95		95
96	.code64	96	.code64
97	start64:	97	start64:
98	movq (ctx), %rsp	98	movq (ctx), %rsp
99	call main_ap # never returns	99	call main_ap # never returns
100		100
101		101
102	#endif /* CONFIG_SMP */	102	#endif /* CONFIG_SMP */
103		103

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