WebSVN – HelenOS – Diff – /SPARTAN/trunk/arch/ia32/src/cpuid.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.
#
 
# The code below just interfaces the CPUID instruction.
# CPU recognition logic is contained in higher-level functions.
 
.text
 
.global has_cpuid
.global cpuid
.global rdtsc
 
 
## Determine CPUID support
#
# Return 0 in EAX if CPUID is not support, 1 if supported.
#
has_cpuid:
	push %ebx
	
	pushf			# store flags
	popl %eax		# read flags
	movl %eax,%ebx		# copy flags
	btcl $21,%ebx		# swap the ID bit
	pushl %ebx
	popf			# propagate the change into flags
	pushf
	popl %ebx		# read flags	
	andl $(1<<21),%eax	# interested only in ID bit
	andl $(1<<21),%ebx
	xorl %ebx,%eax		# 0 if not supported, 1 if supported
	
	pop %ebx
	ret
 
 
## Get CPUID data
#
# This code is just an interfaces the CPUID instruction, CPU recognition
# logic is contained in higher-level functions.
#
# The C prototype is:
#   void cpuid(__u32 cmd, struct cpu_info *info)
#
# @param cmd  CPUID command.
# @param info Buffer to store CPUID output.
#
cpuid:
	pushl %ebp
	movl %esp,%ebp
	pusha
 
	movl 8(%ebp),%eax	# load the command into %eax
	movl 12(%ebp),%esi	# laod the address of the info struct
 
	cpuid	
	movl %eax,0(%esi)
	movl %ebx,4(%esi)
	movl %ecx,8(%esi)
	movl %edx,12(%esi)
 
	popa
	popl %ebp
	ret
 
rdtsc:
	rdtsc
	ret
 
 
Generated by GNU Enscript 1.6.6.
 
 
 

Rev 65	Rev 125
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	# The code below just interfaces the CPUID instruction.	29	# The code below just interfaces the CPUID instruction.
30	# CPU recognition logic is contained in higher-level functions.	30	# CPU recognition logic is contained in higher-level functions.
31		31
32	.text	32	.text
33		33
34	.global has_cpuid	34	.global has_cpuid
35	.global cpuid	35	.global cpuid
36	.global rdtsc	36	.global rdtsc
37		37
38		38
39	## Determine CPUID support	39	## Determine CPUID support
40	#	40	#
41	# Return 0 in EAX if CPUID is not support, 1 if supported.	41	# Return 0 in EAX if CPUID is not support, 1 if supported.
42	#	42	#
43	has_cpuid:	43	has_cpuid:
44	push %ebx	44	push %ebx
45		45
46	pushf # store flags	46	pushf # store flags
47	popl %eax # read flags	47	popl %eax # read flags
48	movl %eax,%ebx # copy flags	48	movl %eax,%ebx # copy flags
49	btcl $21,%ebx # swap the ID bit	49	btcl $21,%ebx # swap the ID bit
50	pushl %ebx	50	pushl %ebx
51	popf # propagate the change into flags	51	popf # propagate the change into flags
52	pushf	52	pushf
53	popl %ebx # read flags	53	popl %ebx # read flags
54	andl $(1<<21),%eax # interested only in ID bit	54	andl $(1<<21),%eax # interested only in ID bit
55	andl $(1<<21),%ebx	55	andl $(1<<21),%ebx
56	xorl %ebx,%eax # 0 if not supported, 1 if supported	56	xorl %ebx,%eax # 0 if not supported, 1 if supported
57		57
58	pop %ebx	58	pop %ebx
59	ret	59	ret
60		60
61		61
62	## Get CPUID data	62	## Get CPUID data
63	#	63	#
64	# This code is just an interfaces the CPUID instruction, CPU recognition	64	# This code is just an interfaces the CPUID instruction, CPU recognition
65	# logic is contained in higher-level functions.	65	# logic is contained in higher-level functions.
66	#	66	#
67	# The C prototype is:	67	# The C prototype is:
68	# void cpuid(__u32 cmd, struct cpu_info *info)	68	# void cpuid(__u32 cmd, struct cpu_info *info)
69	#	69	#
70	# @param cmd CPUID command.	70	# @param cmd CPUID command.
71	# @param info Buffer to store CPUID output.	71	# @param info Buffer to store CPUID output.
72	#	72	#
73	cpuid:	73	cpuid:
74	pushl %ebp	74	pushl %ebp
75	movl %esp,%ebp	75	movl %esp,%ebp
76	pusha	76	pusha
77		77
78	movl 8(%ebp),%eax # load the command into %eax	78	movl 8(%ebp),%eax # load the command into %eax
79	movl 12(%ebp),%esi # laod the address of the info struct	79	movl 12(%ebp),%esi # laod the address of the info struct
80		80
81	cpuid	81	cpuid
82	movl %eax,0(%esi)	82	movl %eax,0(%esi)
83	movl %ebx,4(%esi)	83	movl %ebx,4(%esi)
84	movl %ecx,8(%esi)	84	movl %ecx,8(%esi)
85	movl %edx,12(%esi)	85	movl %edx,12(%esi)
86		86
87	popa	87	popa
88	popl %ebp	88	popl %ebp
89	ret	89	ret
90		90
91	rdtsc:	91	rdtsc:
92	rdtsc	92	rdtsc
93	ret	93	ret
94		94
95		95
96	Generated by GNU Enscript 1.6.6.	96	Generated by GNU Enscript 1.6.6.
97		97
98		98
99		99

Subversion Repositories HelenOS

(root)/SPARTAN/trunk/arch/ia32/src/cpuid.s – Rev 65 → 125