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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | jermar | 1 | # |
| 2 | # Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | # All rights reserved. |
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| 4 | # |
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| 5 | # Redistribution and use in source and binary forms, with or without |
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| 6 | # modification, are permitted provided that the following conditions |
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| 7 | # are met: |
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| 8 | # |
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| 9 | # - Redistributions of source code must retain the above copyright |
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| 10 | # notice, this list of conditions and the following disclaimer. |
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| 11 | # - Redistributions in binary form must reproduce the above copyright |
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| 12 | # notice, this list of conditions and the following disclaimer in the |
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| 13 | # documentation and/or other materials provided with the distribution. |
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| 14 | # - The name of the author may not be used to endorse or promote products |
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| 15 | # derived from this software without specific prior written permission. |
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| 16 | # |
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | # |
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| 28 | |||
| 29 | # The code below just interfaces the CPUID instruction. |
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| 30 | # CPU recognition logic is contained in higher-level functions. |
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| 31 | |||
| 32 | .text |
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| 33 | |||
| 34 | .global has_cpuid |
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| 35 | .global cpuid |
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| 36 | .global rdtsc |
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| 37 | |||
| 65 | decky | 38 | |
| 39 | ## Determine CPUID support |
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| 40 | # |
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| 41 | # Return 0 in EAX if CPUID is not support, 1 if supported. |
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| 42 | # |
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| 1 | jermar | 43 | has_cpuid: |
| 44 | push %ebx |
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| 45 | |||
| 46 | pushf # store flags |
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| 47 | popl %eax # read flags |
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| 48 | movl %eax,%ebx # copy flags |
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| 49 | btcl $21,%ebx # swap the ID bit |
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| 50 | pushl %ebx |
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| 51 | popf # propagate the change into flags |
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| 52 | pushf |
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| 53 | popl %ebx # read flags |
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| 54 | andl $(1<<21),%eax # interested only in ID bit |
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| 55 | andl $(1<<21),%ebx |
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| 56 | xorl %ebx,%eax # 0 if not supported, 1 if supported |
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| 57 | |||
| 58 | pop %ebx |
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| 59 | ret |
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| 60 | |||
| 65 | decky | 61 | |
| 62 | ## Get CPUID data |
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| 63 | # |
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| 64 | # This code is just an interfaces the CPUID instruction, CPU recognition |
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| 65 | # logic is contained in higher-level functions. |
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| 66 | # |
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| 67 | # The C prototype is: |
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| 68 | # void cpuid(__u32 cmd, struct cpu_info *info) |
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| 69 | # |
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| 70 | # @param cmd CPUID command. |
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| 71 | # @param info Buffer to store CPUID output. |
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| 72 | # |
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| 1 | jermar | 73 | cpuid: |
| 74 | pushl %ebp |
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| 75 | movl %esp,%ebp |
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| 76 | pusha |
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| 77 | |||
| 78 | movl 8(%ebp),%eax # load the command into %eax |
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| 79 | movl 12(%ebp),%esi # laod the address of the info struct |
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| 80 | |||
| 81 | cpuid |
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| 82 | movl %eax,0(%esi) |
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| 83 | movl %ebx,4(%esi) |
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| 84 | movl %ecx,8(%esi) |
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| 85 | movl %edx,12(%esi) |
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| 125 | jermar | 86 | |
| 1 | jermar | 87 | popa |
| 88 | popl %ebp |
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| 89 | ret |
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| 90 | |||
| 91 | rdtsc: |
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| 92 | rdtsc |
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| 93 | ret |