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-rw-r--r--arch/i386/kernel/verify_cpu.S94
1 files changed, 0 insertions, 94 deletions
diff --git a/arch/i386/kernel/verify_cpu.S b/arch/i386/kernel/verify_cpu.S
deleted file mode 100644
index fff4aa61d7c3..000000000000
--- a/arch/i386/kernel/verify_cpu.S
+++ /dev/null
@@ -1,94 +0,0 @@
1/* Check if CPU has some minimum CPUID bits
2 This runs in 16bit mode so that the caller can still use the BIOS
3 to output errors on the screen */
4#include <asm/cpufeature.h>
5#include <asm/msr.h>
6
7verify_cpu:
8 pushfl # Save caller passed flags
9 pushl $0 # Kill any dangerous flags
10 popfl
11
12#if CONFIG_X86_MINIMUM_CPU_FAMILY >= 4
13 pushfl
14 pop %eax
15 orl $(1<<18),%eax # try setting AC
16 push %eax
17 popfl
18 pushfl
19 popl %eax
20 testl $(1<<18),%eax
21 jz bad
22#endif
23#if REQUIRED_MASK0 != 0
24 pushfl # standard way to check for cpuid
25 popl %eax
26 movl %eax,%ebx
27 xorl $0x200000,%eax
28 pushl %eax
29 popfl
30 pushfl
31 popl %eax
32 cmpl %eax,%ebx
33 pushfl # standard way to check for cpuid
34 popl %eax
35 movl %eax,%ebx
36 xorl $0x200000,%eax
37 pushl %eax
38 popfl
39 pushfl
40 popl %eax
41 cmpl %eax,%ebx
42 jz bad # REQUIRED_MASK0 != 0 requires CPUID
43
44 movl $0x0,%eax # See if cpuid 1 is implemented
45 cpuid
46 cmpl $0x1,%eax
47 jb bad # no cpuid 1
48
49#if REQUIRED_MASK0 & NEED_CMPXCHG64
50 /* Some VIA C3s need magic MSRs to enable CX64. Do this here */
51 cmpl $0x746e6543,%ebx # Cent
52 jne 1f
53 cmpl $0x48727561,%edx # aurH
54 jne 1f
55 cmpl $0x736c7561,%ecx # auls
56 jne 1f
57 movl $1,%eax # check model
58 cpuid
59 movl %eax,%ebx
60 shr $8,%ebx
61 andl $0xf,%ebx
62 cmp $6,%ebx # check family == 6
63 jne 1f
64 shr $4,%eax
65 andl $0xf,%eax
66 cmpl $6,%eax # check model >= 6
67 jb 1f
68 # assume models >= 6 all support this MSR
69 movl $MSR_VIA_FCR,%ecx
70 rdmsr
71 orl $((1<<1)|(1<<7)),%eax # enable CMPXCHG64 and PGE
72 wrmsr
731:
74#endif
75 movl $0x1,%eax # Does the cpu have what it takes
76 cpuid
77
78#if CONFIG_X86_MINIMUM_CPU_FAMILY > 4
79#error add proper model checking here
80#endif
81
82 andl $REQUIRED_MASK0,%edx
83 xorl $REQUIRED_MASK0,%edx
84 jnz bad
85#endif /* REQUIRED_MASK0 */
86
87 popfl
88 xor %eax,%eax
89 ret
90
91bad:
92 popfl
93 movl $1,%eax
94 ret