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cpu32_str
2004 Oct 07
1
x86 vs. x86_64 detection proof of concept patch (try two)
...wed from the Linux kernel
arch/x86_64/kernel/head.S
+;
+ mov word [CpuIs64], 0
+ mov eax, 80000000h
+ cpuid
+ cmp eax, 80000000h
+ jbe afterbits
+ ; Check if long mode is implemented
+ mov eax, 80000001h
+ cpuid
+ bt edx, 29
+ jnc afterbits
+ mov word [CpuIs64], 1
+afterbits:
+ mov si, cpu64_str
+ cmp word [CpuIs64], 1
+ je writecpustr
+ mov si, cpu32_str
+writecpustr: call writestr
+
+;
; Assume API version 2.1, in case we find the !PXE structure without
; finding the PXENV+ structure. This should really look at the Base
; Code ROM ID structure in have_pxe, but this is adequate for...