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-rw-r--r--arch/x86_64/kernel/verify_cpu.S22
1 files changed, 4 insertions, 18 deletions
diff --git a/arch/x86_64/kernel/verify_cpu.S b/arch/x86_64/kernel/verify_cpu.S
index e035f5948199..45b6f8a975a1 100644
--- a/arch/x86_64/kernel/verify_cpu.S
+++ b/arch/x86_64/kernel/verify_cpu.S
@@ -37,20 +37,6 @@ verify_cpu:
37 pushl $0 # Kill any dangerous flags 37 pushl $0 # Kill any dangerous flags
38 popfl 38 popfl
39 39
40 /* minimum CPUID flags for x86-64 as defined by AMD */
41#define M(x) (1<<(x))
42#define M2(a,b) M(a)|M(b)
43#define M4(a,b,c,d) M(a)|M(b)|M(c)|M(d)
44
45#define SSE_MASK \
46 (M2(X86_FEATURE_XMM,X86_FEATURE_XMM2))
47#define REQUIRED_MASK1 \
48 (M4(X86_FEATURE_FPU,X86_FEATURE_PSE,X86_FEATURE_TSC,X86_FEATURE_MSR)|\
49 M4(X86_FEATURE_PAE,X86_FEATURE_CX8,X86_FEATURE_PGE,X86_FEATURE_CMOV)|\
50 M(X86_FEATURE_FXSR))
51#define REQUIRED_MASK2 \
52 (M(X86_FEATURE_LM - 32))
53
54 pushfl # standard way to check for cpuid 40 pushfl # standard way to check for cpuid
55 popl %eax 41 popl %eax
56 movl %eax,%ebx 42 movl %eax,%ebx
@@ -79,8 +65,8 @@ verify_cpu:
79verify_cpu_noamd: 65verify_cpu_noamd:
80 movl $0x1,%eax # Does the cpu have what it takes 66 movl $0x1,%eax # Does the cpu have what it takes
81 cpuid 67 cpuid
82 andl $REQUIRED_MASK1,%edx 68 andl $REQUIRED_MASK0,%edx
83 xorl $REQUIRED_MASK1,%edx 69 xorl $REQUIRED_MASK0,%edx
84 jnz verify_cpu_no_longmode 70 jnz verify_cpu_no_longmode
85 71
86 movl $0x80000000,%eax # See if extended cpuid is implemented 72 movl $0x80000000,%eax # See if extended cpuid is implemented
@@ -90,8 +76,8 @@ verify_cpu_noamd:
90 76
91 movl $0x80000001,%eax # Does the cpu have what it takes 77 movl $0x80000001,%eax # Does the cpu have what it takes
92 cpuid 78 cpuid
93 andl $REQUIRED_MASK2,%edx 79 andl $REQUIRED_MASK1,%edx
94 xorl $REQUIRED_MASK2,%edx 80 xorl $REQUIRED_MASK1,%edx
95 jnz verify_cpu_no_longmode 81 jnz verify_cpu_no_longmode
96 82
97verify_cpu_sse_test: 83verify_cpu_sse_test: