參數資料
型號: AMDK86
英文描述: AMD K86 - AMD K86 Family BIOS and Software Tools Developers Guide
中文描述: AMD的K86 - AMD的K86系列BIOS和軟件工具開發(fā)人員指南
文件頁數: 21/144頁
文件大小: 2179K
代理商: AMDK86
AMD-K5 Processor
9
21062E/0—June 1997
AMD K86 Family BIOS and Software Tools Developers Guide
Preliminary Information
SMM Initial Register Values
Table 3 shows the initial state of registers when entering SMM.
SMM State-Save Area
When the processor acknowledges an SMI interrupt by
asserting SMIACT#, it saves its state in the 512-byte SMM
state-save area shown in Table 4. The save begins at the top of
the SMM memory area (SMM Base Address + FFFFh) and fills
down to SMM base address + FE00h.
Table 4 shows the offsets in the SMM state-save area relative to
the SMM base address. The SMM service routine can alter any
of the read and write values in the state-save area. The contents
of any reserved locations in the state-save area are not
necessarily the same between the AMD-K5 processor and
Pentium or 486 processors.
Table 3.
Initial State of Registers in SMM
Register
Initial Contents
Selector
3000h
0000h
0000h
0000h
0000h
0000h
Base
Limit
4 Gbytes
4 Gbytes
4 Gbytes
4 Gbytes
4 Gbytes
4 Gbytes
CS
DS
ES
FS
GS
SS
General-Purpose Registers
EFLAGS
EIP
CR0
CR4
GDTR
LDTR
IDTR
TR
DR7
DR6
0003_0000h
0000_0000h
0000_0000h
0000_0000h
0000_0000h
0000_0000h
Unmodified
0000_0002h
0000_8000h
Bits 0, 2, 3, and 31 cleared (PE, EM, TS, and PG); remainder are unmodified
0000_0000h
Unmodified
Unmodified
Unmodified
Unmodified
0000_0400h
Undefined
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