TI486 Microprocessor - Al Kossow's Bitsavers

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8MI Handler Example A.5 SMI Handler Example This section contains fragments of typical coding found within <strong>TI486</strong> 8MI handlers. 5MBASE= OC8000H SMSIZE= 2 SMEND = SMSIZE SHL (SMSIZE-l) INCLUDE smimac.inc .MODEL SMALL .386P . CODE ; base address of SMM space ; SMM space size is 8k bytes ;works for most cases ;see Section A.12 COMMENT 1\ Execution begins here in real mode, with CS defined at the 5MBASE and EXP=O It. public smi_start smi_start: jmp $skipdata ;skip data area, makes it easy for ; assembler EAXsavedd ? DSsavedt ? DStempb Offh, Offh, O,O,O,92h,8fh,O,O,O ;4gig present segment $skipdata: mov dword ptr cs: [EAXsave],eax; save EAX svdc rsdc cs:, [DSsave], ds ds,cs:, [DStemp] save DS ; setDS mov ax, cs mov ds, ax COMMENT It. We need to extend the limits of DS so that we don't get a fault when we use it to access low memory. Xt may be not present with a limit of 0, and these values won't be changed when we set it using a real mode load. A-15
8MI Handler Example ;Determine Why Are We In The SMI Handler COMMENT A Chip set/Core logic unique instructions will follow. The chip set will be used to deter.mine what caused the SMM interrupt to occur. The B~OS could also "jump" to this point in the SMM region. A ; ; Decision Tree: ;a) ;b) ;c) If timer, go to timer_expired If port i/o occurred to a trapped location, go to port_io_caused If the cpu was turned off, go to cpu_turned_off ;timer_expired; COMMENT A A chip set timer has expired. Unique code would appear to deter.mine which timer. Depending on the purpose of the timer the handler could; 1) Reduce the clock frequency 2) Execute a halt instruction and enter suspend mode 3) Turn current off to the CPU 4) Turn off a peripheral device 5) Reset the timer and increment a counter reduce_clock: COMMENT A To go to a lower CPU current requirement the CPU clock can be reduced. The CPU clock can be reduced from its current setting to a lower value. That value could be zero. Since the CPU is a static device and will maintain the state of all its registers in the absence of a clock input there is no state saving requirement. ~t is assumed that by writing to the chip set it will reduce or zero the clock. ~f the clock is stopped then the next instruction to be executed will be one in this SM~ handler immediately following the point where the chip set turned the clock off. jmp end_timer: A-16 Tl486 8MM Programmer's Guide
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.TEXAS INSTRUMENTS TI486 Microproce
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TI486 Microprocessor Reference Guid
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Preface Read This First About This
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About This Manual Appendix D Orderi
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Contents 1 Product Overview .......
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Contents 5.5 AC Characteristics . .
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1-1 TI486SLC/E Functional Block Dia
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Figures 4-27 SUSP Initiated Suspend
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Tables 5-3 Absolute Maximum Ratings
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Product Overview 1-1
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Chapter 1 Product Overview Features
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1.2 Differences Between the TI486SL
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Tl486SLCIE Overview Figure 1-2. TI4
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Tl486DLCIE Overview 1.4 TI486DLC/E
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TI486DLCIE Overview The TI486DLC/E
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Power Management / System Managemen
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Programming Interface 2-1
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Chapter 2 In this chapter, the inte
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Processor Initialization Table 2-1.
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Instruction Set Overview 2.2 Instru
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Register Set 2.3 Register Set There
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Register Set Pointer and Index Regi
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Register Set 2.3.1.2 Segment Regist
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Register Set 2.3.1.3 Instruction Po
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Register Set 2.3.2 System Register
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Register Set 2.3.2.1 Control Regist
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Register Set 2.3.2.2 Descriptor Tab
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Register Set Table 2-6. Segment Des
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Register Set During task switching,
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Register Set The CCRO register (Tab
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Register Set Table 2-9. TI486DLCIE
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Register Set Table 2-12. ARR 1-ARR4
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Register Set 2.3.2.6 Test Registers
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Register Set Table 2-14. TR6 and TR
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Address Spaces 2.4 Address Spaces T
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Address Spaces 2.4.2 Memory Address
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Address Spaces Figure 2-21. Real Mo
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Address Spaces Figure 2-24. Paging
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Interrupts and Exceptions 2.5 Inter
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Interrupts and Exceptions 2.5.3 Int
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Interrupts and Exceptions Table 2-2
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System Management Mode 2.6 System M
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System Management Mode Figure 2-29.
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System Management Mode The new SMM
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System Management Mode During SMM o
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Protection The Current Privilege Le
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Virtual 8086 Mode 2.9 Virtual 8086
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TI486SLC/E Bus Interface 3-1
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Chapter 3 TI486SLC/E Bus Interface
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Overview Table 3-1. TI486SLCIE Sign
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Overview Table 3-2. Terminal Functi
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Overview 3.1.1 Bus Cycle Definition
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Overview Table 3-5 shows the state
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Functional Timing Figure 3-3. Bus A
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Functional Timing 3.2.2.1 Bus Cycle
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Functional Timing Non-Pipelined Wai
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Functional Timing Because of the de
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Functional Timing Pipelined Wait St
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Functional Timing Initiating and Ma
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Functional Timing Figure 3-12. Comp
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Functional Timing Figure 3-13. Inte
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Functional Timing Shutdown Indicati
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Functional Timing Figure 3-17. Pipe
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Functional Timing As shown in Figur
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Functional Timing Figure 3-19. Requ
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Functional Timing Figure 3-22. 8MI
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Functional Timing HALT Initiated Su
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Functional Timing 3.2.12 Float Figu
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TI486DLC/E Bus Interface 4-1
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Chapter 4 TI486DLC/E Bus Interface
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Overview Table 4-1. TI486DLCIE SIgn
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Overview Table 4-6. Signal States D
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Overview 4.1.2 Power Management 4.1
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Functional Timing 4.2 Functional Ti
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Functional Timing The TI486DLC/E da
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Functional Timing Non-Pipelined Rea
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Functional Timing Initiating and Ma
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Functional Timing Figure 4-8. Faste
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Functional Timing Figure 4-9. Vario
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Functional Timing Once a pipelined
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Functional Timing 4.2.3 Bus Cycles
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Functional Timing Pipelined Cycles
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Functional Timing LOCK is activated
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Functional Timing 4.2.6 Halt and Sh
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Functional Timing Figure 4-17. Pipe
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Functional Timing Figure 4-19. Non-
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Functional Timing The TI486DLC/E sa
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Functional Timing 4.2.9 Hold Acknow
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Functional Timing 4.2.10 Coprocesso
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Functional Timing 4.2.12 Power Mana
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Functional Timing Stopping the Inpu
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Electrical Specifications 5-1
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Chapter 5 Electrical Specifications
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ElectricalConnecnons It is recommen
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Recommended Operating Conditions 5.
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DC Electrical Characteristics Table
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AC Characteristics Figure 5-2. TI48
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AC Characteristics Table 5-9. AC Ch
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AC Characteristics Table 5-11. AC C
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____ AC Characteristics 5.5.3 RESET
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Mechanical Specifications 6-1
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Chapter 6 Mechanical Specifications
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Pin Assignments Table 6-1. TI486SLC
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Pin Assignments Figure 6-3. TI486DL
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Package Dimensions 6.2 Package Dime
Page 230 and 231: Thermal Characteristics 6.3 Thermal
Page 232 and 233: Instruction Set 7-1
Page 234 and 235: Chapter 7 Instruction Set This sect
Page 236 and 237: Instruction Fields 7.2 Instruction
Page 238 and 239: Instruction Fields 7.2.5 reg Field
Page 240 and 241: Instruction Fields Table 7-7. mod r
Page 242 and 243: Instruction Fields 7.2.11 sreg3 Fie
Page 244 and 245: Clock Count Summary 7.4 Clock Count
Page 246 and 247: --- --;.J -L 01 Table 7-17. Instruc
Page 248 and 249: I . ~ -.....J Table 7-17. Instructi
Page 250 and 251: Table 7-17. Instructions, Opcodes,
Page 254 and 255: -....J N (J.) Table 7-17. Instructi
Page 256 and 257: I I i I i Table 7-17. Instructions,
Page 258 and 259: ...... ...... '" Table 7-17. Instru
Page 260 and 261: -....J N co Table 7-17. Instruction
Page 262 and 263: "-.I ~ Table 7-17. Instructions, Op
Page 266 and 267: U Appendix A TI486 SMM Pro rammer's
Page 268 and 269: SMM Implementation A.2 SMM Implemen
Page 270 and 271: Figure A-1. SMM Memory Space Header
Page 272 and 273: SMM Implementation 6) NMI is the on
Page 274 and 275: Instruction Summary A.4 Instruction
Page 276 and 277: Instruction Summary A.4.3 Resume No
Page 278 and 279: Instruction Summary A.4.6 Save LDTR
Page 282 and 283: 8MI Handler Example execute_halt: C
Page 284 and 285: 8MI Handler Example COMMENT A The T
Page 286 and 287: 8MI Handler Example arrl arr2 arr3
Page 288 and 289: .MODEL SMALL . STACK .386P INCLUDE
Page 290 and 291: Testing/Debugging SMM Code sgdt COM
Page 292 and 293: Testing/Debugging SMM Code i*******
Page 294 and 295: TI486 Power Management Features A.7
Page 296 and 297: Detection of Tl486 CPU A.9 Detectio
Page 298 and 299: Detection of SMM Capable Version A.
Page 300 and 301: i**********************************
Page 302 and 303: A.11 SMM Feature Comparison SMM Fea
Page 304 and 305: SMM Instruction Macros COMMENT A Co
Page 306 and 307: SMM Instruction Macros SMM Instruct
Page 308 and 309: A.14 Format of Data Used by SVDC/RS
Page 310 and 311: Altering SMM Code Limits A.1S Alter
Page 312 and 313: SMM Errata A.16 SMM Errata The foll
Page 314 and 315: Appendix B TI486 Cache Flush B.1 Ge
Page 316 and 317: Appendix C TI486 BIOS Modification
Page 318 and 319: Introduction Some example assembler
Page 320 and 321: Appendix D Ordering Information 0.1
Page 322: ~TEXAS INSTRUMENTS Printed in U.S.A
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TI486 Microprocessor - Al Kossow's Bitsavers

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