Intel core 2 Duo T5850 Especificações descarregar pdf (Página 228)

Intel

64 and IA-32 Architectures Software Developer’s Manual Documentation Changes 228

Documentation Changes

by privilege level 0 operating system or executive procedures for fast returns to privilege

level 3 user code.

Stack pointers for SYSCALL/SYSRET are not specified through model specific registers.

The clearing of bits in RFLAGS is programmable rather than fixed. SYSCALL/SYSRET

save and restore the RFLAGS register.

For SYSCALL, the processor saves RFLAGS into R11 and the RIP of the next instruction

into RCX; it then gets the privilege-level 0 target instruction and stack pointer from:

• Target code segment — Reads a non-NULL selector from IA32_STAR[47:32].

• Target instruction — Reads a 64-bit canonical address from IA32_LSTAR.

• Stack segment — Computed by adding 8 to the value in IA32_STAR[47:32].

• System flags — The processor sets RFLAGS to the logical-AND of its current value

with the complement of the value in the IA32_FMASK MSR.

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Intel core 2 Duo T5850 Especificações Página 228