| 0,0 → 1,79 |
|---|
| # |
| # 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. |
| # |
| |
| # |
| # CPU identification functions. |
| # 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 |
| |
| 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 |
| |
| # cpuid(__u32 cmd, struct cpu_info *info) |
| 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 |