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Implemented (but have not yet tested) 286 LOADALL

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This commit is contained in:
Jeff Parsons 2014-10-31 13:40:19 -07:00 • committed by jeffpar
commit 5e6604b760
9 changed files with 335 additions and 173 deletions
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18
my_modules/pcjs-client/lib/x86.js
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@ -57,7 +57,10 @@ var X86 = {
IF: 0x0200, // bit 9: Interrupt flag
DF: 0x0400, // bit 10: Direction flag
OF: 0x0800, // bit 11: Overflow flag
IOPL: 0x3000, // 12-13: I/O Privilege Level, always set on 8086/80186, clear on 80286
IOPL: {
MASK: 0x3000, // 12-13: I/O Privilege Level (always set on 8086/80186, clear on 80286)
SHIFT: 12
},
NT: 0x4000, // bit 14: Nested Task flag, always set on 8086/80186, clear on 80286
BIT15: 0x8000 // bit 15: reserved, always set on 8086/80186, clear otherwise
},
@ -200,7 +203,7 @@ var X86 = {
NOINTR: 0x0004, // indicates a segreg has been set, or a prefix, or an STI (delay INTR acknowledgement)
SEG: 0x0010,
LOCK: 0x0020,
REPZ: 0x0040, // repeat while Z (NOTE: this value MUST match PS_ZF; see opCMPSb/opCMPSw/opSCASb/opSCASw)
REPZ: 0x0040, // repeat while Z (NOTE: this value MUST match PS.ZF; see opCMPSb/opCMPSw/opSCASb/opSCASw)
REPNZ: 0x0080, // repeat while NZ
REPEAT: 0x0100, // this indicates that an instruction is being repeated (ie, some iteration AFTER the first)
PUSHSP: 0x0200 // the SP register is potentially being referenced by a PUSH SP opcode, adjustment may be required
@ -279,10 +282,13 @@ X86.PS.DIRECT = (X86.PS.TF | X86.PS.IF | X86.PS.DF);
X86.PS.INDIRECT = (X86.PS.CF | X86.PS.PF | X86.PS.AF | X86.PS.ZF | X86.PS.SF | X86.PS.OF);
/*
* NOTE: This is the default for 8086/8088; other processors must tweak these bits before
* calling setPS(). TODO: Verify that PS_1 was always set on reset, even on the 8086/8088.
* NOTE: These are the default "always set" PS bits for the 8086/8088; other processors must
* adjust these bits accordingly. The final adjusted value is then stored in the X86CPU object
* as "this.PS_SET"; setPS() must use that value, NOT this one.
*
* TODO: Verify that PS.BIT1 was always set on reset, even on the 8086/8088.
*/
X86.PS.SET = (X86.PS.BIT1 | X86.PS.IOPL | X86.PS.NT | X86.PS.BIT15);
X86.PS.SET = (X86.PS.BIT1 | X86.PS.IOPL.MASK | X86.PS.NT | X86.PS.BIT15);
/*
* getPS() brings all the direct and indirect flags together, and setPS() performs the
@ -295,7 +301,7 @@ X86.PS.SET = (X86.PS.BIT1 | X86.PS.IOPL | X86.PS.NT | X86.PS.BIT15);
* this.resultParitySign
* this.resultAuxOverflow
*
* PS_SAHF is a subset of the arithmetic flags, and refers only to those flags that the
* PS.SAHF is a subset of the arithmetic flags, and refers only to those flags that the
* SAHF and LAHF "8080 legacy" opcodes affect.
*/
X86.PS.SAHF = (X86.PS.CF | X86.PS.PF | X86.PS.AF | X86.PS.ZF | X86.PS.SF);