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

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