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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. |
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30 | # CPU recognition logic is contained in higher-level functions. |
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31 | - | ||
32 | .text |
29 | .text |
33 | 30 | ||
34 | .global has_cpuid |
31 | .global has_cpuid |
35 | .global cpuid |
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36 | .global rdtsc |
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37 | 32 | ||
38 | 33 | ||
39 | ## Determine CPUID support |
34 | ## Determine CPUID support |
40 | # |
35 | # |
41 | # Return 0 in EAX if CPUID is not support, 1 if supported. |
36 | # Return 0 in EAX if CPUID is not supported, 1 if supported. |
42 | # |
37 | # |
43 | has_cpuid: |
38 | has_cpuid: |
44 | push %ebx |
- | |
45 | - | ||
46 | pushf # store flags |
39 | pushf # store flags |
47 | popl %eax # read flags |
40 | popl %eax # read flags |
48 | movl %eax,%ebx # copy flags |
41 | movl %eax,%edx # copy flags |
49 | btcl $21,%ebx # swap the ID bit |
42 | btcl $21,%edx # swap the ID bit |
50 | pushl %ebx |
43 | pushl %edx |
51 | popf # propagate the change into flags |
44 | popf # propagate the change into flags |
52 | pushf |
45 | pushf |
53 | popl %ebx # read flags |
46 | popl %edx # read flags |
54 | andl $(1<<21),%eax # interested only in ID bit |
47 | andl $(1<<21),%eax # interested only in ID bit |
55 | andl $(1<<21),%ebx |
48 | andl $(1<<21),%edx |
56 | xorl %ebx,%eax # 0 if not supported, 1 if supported |
49 | xorl %edx,%eax # 0 if not supported, 1 if supported |
57 | - | ||
58 | pop %ebx |
- | |
59 | ret |
- | |
60 | - | ||
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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73 | cpuid: |
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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 |
- | |
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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86 | - | ||
87 | popa |
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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 |
50 | ret |