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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 |
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96 |
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97 | 97 | ||
98 | 98 | ||
99 | 99 |