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-
Itt egyetlen dolog a lényeges: hogy az NX bitet nem támogatják (első körben).
A többi lényegtelen apróság. -
HiperG
addikt
A két 64 bites technológia között - bár kompatibilisek egymással - van néhány különbség:
>Could you publish list of differences between amd64 and ia32e?
>
>I probably could took those two 300+ page documents and try to compare
>them by hand, but I believe you know already.
>
> Pavel
Other than the standard IA-32 differences (eg. HT, SSE3, Intel Enhanced
SpeedStep, etc.), there are few differences between the implementations
of
IA-32e and AMD64. The software visible ones are:
Fast system calls:
Syscall/sysret is supported only in 64-bit mode (not in compatibility
mode). Sysenter/Sysexit is supported in both 64-bit and compatible
mode.
CPUID:
If you look at Table 2-8 of Volume 1, you will find IA-32e specific
things,
including, GenuineIntel, HT, SSE3, monitor/mwait, Intel Enhanced
SpeedStep,
and cmpxchg16b.
The function 8000_0001h doesn't duplicate standard-feature bits from
function 1 in EDX. It sets only the new features that are implemented.
MSRs:
Not all MSRs are architectural, and IA-32e does not implement SYSCFG,
TOP_MEM, TOP_MEM2, for example. MSR usage should be vendor specific
and
be guarded with CPUID.Model
Fast-FXSAVE/FXRSTOR:
IA-32e always saves all of the FP state on FXSAVE/FXRSTOR. Does not
support FXSAVE/FXRSTOR with reduced FP state.
Microcode Update:
IA-32e supports microcode update as the 32-bit mode does, as you
already
found the discussions in the mailing list.
NX (No-Execute) bit:
Initial implementation will not support the NX bit.
BSF/BSR when source is 0 & operand size is 32:
In 64-bit mode, the processor sets ZF, and the upper 32 bits of
the destination are undefined. Should always check the ZF or do not
use
32-bit operand size.
Near branch with 66H prefix:
As documented in PRM the behavior is implementation specific and
should
avoid using 66H prefix on near branches.
Not supported in IA-32e
=======================
3DNow instructions (including prefecthw or prefetch with the opcode 0f
0d)
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