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ST486DX Datasheet(PDF) 2 Page - STMicroelectronics |
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ST486DX Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 34 page 1. SMM OVERVIEW Pages 9 1.1 Introduction . . .... . ... ... .. . . . ... . ... .. ... .... . ... ... .. . . . 9 1.2 SGS Thomson SMM Features . . . . . . . . . . . . . . . . . . . . . . . . .... . . . . ... . 9 1.3 A Typical SMM Routine . . . . . . . . . . . . . . . . . . . . . . . . . .... ... . . . . . . . 10 2. SGS THOMSON SMM IMPLEMENTATION 13 2.1 Hardware Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... ... .. ... 13 2.2 Configuration Control Registers . . . . . . . . . . . . ... ... .. ... ... .. . . . ... . 14 2.3 SMM Instruction Summary . . . . . . . . . . . . . . . . . . . ... ... .. ... ... .. . . . 18 3. SMM SOFTWARE CONSIDERATIONS 23 3.1 Enabling SMM . . . . . ... ... .. ... ... .. . . . ... . ... . . ... ... .. ... 23 3.2 SMM Handler Entry State . . . . . . . . . . . . . . . . . . . . . . .... . . . . ... . ... . 24 3.3 Maintaining the CPU State . . . . . . . . . . . . . . . ... ... .. ... ... .. . . . ... . 28 3.4 Initializing the SMM Environment . . . . . . . . . . . . . . . . . . . . . . . . .... ... . . . 31 3.5 Accessing Main Memory Overlapped by SMM Memory . . . . . . . ... ... .. ... ... . 32 3.6 I/O Restart . . . . . . . . . . . . . . . . . . . . . . .... . . . . ... . ... . ... . ... . 33 3.7 I/O Port Shadowing and Emulation . . . . . . . . . . . . . . . . . . . . . . . . . .... . ... 34 3.8 Return to HLT Instruction . . . . . . . . . . . . . . . . . . . . . . .... . . . . ... . ... . 35 3.9 Exiting the SMI Handler . . . .... . ... ... .. . . . ... . ... .. ... .... . . . . 37 3.10 Testing and Debugging SMM Code . . . .... ... . . . . . . . . . . . . . ... . ... . . . 38 4. POWER MANAGEMENT FEATURES 41 4.1 Reducing the Clock Frequency . . . . . . . . . . . . . ... ... .. ... ... .. . . . ... . 41 4.2 Lowering the CPU Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . ... ... .. ... 41 4.3 Suspend Mode . . . . .... . ... ... .. . . . ... . ... .. ... .... . ... ... . 42 Appendix A Assembler Macros for SGS Thomson Instructions 45 GENERAL INDEX 5 |
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