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| 型號(hào)： | 21086 |
| 英文描述： | SYSCALL and SYSRET Instruction Specification? 341KB (PDF) |
| 中文描述： | 系統(tǒng)調(diào)用和SYSRET指令規(guī)范？ 341KB（PDF格式） |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 341K |
| 代理商： | 21086 |
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New Method
5
21086C/0—May 1998
SYSCALL and SYSRET Instruction Specification
forcing all applications to use a common and consistent view of
the memory model. This simplification comes from eliminating
unneeded checks as well as loading pre-determined values into
the on-chip Code Segment and Stack Segment descriptor
caches.
It is assumed that the base, limit, and attributes of the Code
Segment will remain the same for all processes and for the
operating system, and that only the current privilege level for
the selector of the calling process should be changed from a
current privilege level of three to a new privilege level of zero.
It is also assumed (but not checked) that the privilege level of
the selectors for the CALL and RET target CS segments are set
to zero and three, respectively
(for SYSCALL—code segment
selector requested privilege level=0 and for SYSRET—code
segment selector requested privilege level=3).
The SYSCALL and SYSRET instructions should be used in
environments where neither the operating system nor the
applications alter the Code Segment or Stack Segment in a
manner different than what is assumed by the instructions. The
SYSCALL instruction sets the base, limit, and attributes of both
CS and SS to fixed values on entry. The SYSRET instruction
sets CS to the same fixed values upon exiting. In a flat memory
model, only the privilege level of the segments need to change.
No memory accesses to descriptors are required. It is the
responsibility of the operating system to keep the descriptors in
memory that correspond to the CS and SS selectors loaded by
segment base, limit, and attribute values forced by these
instructions.
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