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Implemented 80286 LOADALL

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Jeff Parsons 2014-11-01 17:12:20 -07:00 • committed by jeffpar
commit 5dce2a1a23
31 changed files with 1831 additions and 1765 deletions
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57
my_modules/pcjs-client/lib/x86.js
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@ -75,7 +75,7 @@ var X86 = {
SET: 0xfff0 // on the 80286, these are always set (TODO: Verify)
},
SEL: {
LEVEL: 0x0003, // selector privilege level (0-3)
RPL: 0x0003, // requested privilege level (0-3)
LDT: 0x0004, // table indicator (0: GDT, 1: LDT)
MASK: 0xfff8 // table index
},
@ -91,37 +91,48 @@ var X86 = {
BASE1623: 0x00ff,
MASK: 0xff00,
TYPE: {
MASK: 0x1f00,
SEG: 0x1000,
MASK: 0x1f00,
SEG: 0x1000,
NONSEG: 0x0f00,
/*
* The rest of these apply only when SEG is set
* The following bits apply only when SEG is set
*/
ACCESSED: 0x0100,
READABLE: 0x0200, // CODE: set if readable, clear if execute-only
WRITEABLE: 0x0200, // DATA: set if writable, clear if read-only
CONFORMING: 0x0400, // CODE: set if conforming, clear if not
EXPDOWN: 0x0400, // DATA: set if expand-down, clear if not
CODE: 0x0800, // set for CODE, clear for DATA
CODE_READABLE: 0x0A00, // both CODE and READABLE
CODE_CONFORMING: 0x0C00, // both CODE and CONFORMING
CODE_CONFORMING_READABLE: 0x0E00, // all of CODE and CONFORMING and READABLE
CODE: 0x0800, // set for CODE, clear for DATA
ACCESSED: 0x0100, // set if accessed, clear if not accessed
READABLE: 0x0200, // CODE: set if readable, clear if exec-only
WRITEABLE: 0x0200, // DATA: set if writable, clear if read-only
CONFORMING: 0x0400, // CODE: set if conforming, clear if not
EXPDOWN: 0x0400, // DATA: set if expand-down, clear if not
/*
* The rest of these apply only when SEG is clear
* The following are all the possible (valid) types (well, except for the variations
* of DATA and CODE where the ACCESSED bit (0x0100) may also be set)
*/
TSS: 0x0100,
LDT: 0x0200,
TSS_LDT: 0x0300,
TSS_BUSY: 0x0300,
GATE_CALL: 0x0400,
GATE_TASK: 0x0500,
GATE_INT: 0x0600,
GATE_TRAP: 0x0700
TSS: 0x0100,
LDT: 0x0200,
TSS_LDT: 0x0300,
TSS_BUSY: 0x0300,
GATE_CALL: 0x0400,
GATE_TASK: 0x0500,
GATE_INT: 0x0600,
GATE_TRAP: 0x0700,
DATA_READONLY: 0x1000,
DATA_WRITEABLE: 0x1200,
DATA_EXPDOWN_READONLY: 0x1400,
DATA_EXPDOWN_WRITEABLE: 0x1600,
CODE_EXECONLY: 0x1800,
CODE_READABLE: 0x1a00,
CODE_CONFORMING_EXECONLY: 0x1c00,
CODE_CONFORMING_READABLE: 0x1e00
},
LEVEL: {
DPL: {
MASK: 0x6000,
SHIFT: 13
},
PRESENT: 0x8000
},
EXT: { // descriptor extension word (reserved on the 80286; "must be zero")
OFFSET: 0x6,
MASK: 0xffff
}
},
/*