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646 AMD Geode™ LX Processors Data Book
Instruction Set
33234H
8.3.4 Non-Standard Processor Core Instructions
8.3.4.1 DMINT - Enter Debug Management Mode
Operation
Opcode Instruction Clocks Description
0F 39 DMINT 50-52 Enter DMM and call the DMI handler
IF (CPL<>0 OR (DMM_INST_EN=0 AND SMM=0 AND DMM=0))
#UD;
ELSE
DMM_HEADER[AC_TEMP0] <= AC_TEMP0;
DMM_HEADER[TEMP6] <= TEMP6;
DMM_HEADER[DMM_FLAGS] <= DMM_FLAGS;
DMM_HEADER[EFLAGS] <= EFLAGS;
DMM_HEADER[CR0] <= CR0;
DMM_HEADER[NEXT_IP] <= IP oF INSTRUCTION AFTER DMINT;
DMM_HEADER[CURRENT_IP] <= IP OF DMINT instruction;
DMM_HEADER[CS_LIMIT] <= CS.LIMIT;
DMM_HEADER[CS_BASE] <= CS.BASE;
DMM_HEADER[CS_SELECTOR] <= CS.SELECTOR;
DMM_HEADER[CS_FLAGS] <= CS.FLAGS;
DMM_HEADER[SS_SELECTOR] <= SS.SELECTOR;
DMM_HEADER[SS_FLAGS] <= SS.FLAGS;
DMM_HEADER[XDR7] <= XDR7;
DMM_HEADER[XDR6] <= XDR6;
DMM_HEADER[DR7] <= DR7;
DMM_HEADER[DR6] <= DR6;
if (DMM_CACHE_DISABLE)
CR0 <= 32’h00000010;
else
CR0 <= {1’b0, CR0.CD, CR0.NW, 29’h010};
DR7 <= 32’h00000400;
XDR7 <= 32’H00000000;
SS.flags <= {SS.FLAGS[15:7], 2’b0, SS.FLAGS[4:0]};
CS.FLAGS <= 16’h009a;
CS.SELECTOR <= DMM_BASE >> 4;
CS.BASE <= DMM_BASE;
IF (DMM_LIMIT < 32’g100000)
CS.LIMIT <= DMM_LIMIT;
CS.G <= 1’b0;
else
CS.LIMIT <= DMM_LIMIT | 32’hfff;
CS.G <= 1’b1;
EFLAGS <= 32’h00000002;
DMM <= 1;
Jump to CS at offset of 0;