Retro/pcjs
Watch
1
0
Fork
You've already forked pcjs
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

80286 triple-fault happily resets now

Browse source
This commit is contained in:
Jeff Parsons 2014-11-17 17:26:19 -08:00 • committed by jeffpar
commit 9d73a2674e
21 changed files with 402 additions and 261 deletions
Download patch file Download diff file Expand all files Collapse all files

40
modules/pcjs/lib/x86.js
View file

@ -81,15 +81,15 @@ var X86 = {
},
DESC: { // Descriptor Table Entry
LIMIT: {
OFFSET: 0x0
OFFSET: 0x0
},
BASE: {
OFFSET: 0x2
OFFSET: 0x2
},
ACC: { // bit definitions for the access word (offset 0x4)
OFFSET: 0x4,
BASE1623: 0x00ff,
MASK: 0xff00,
OFFSET: 0x4,
BASE1623: 0x00ff,
MASK: 0xff00,
TYPE: {
MASK: 0x1f00,
SEG: 0x1000,
@ -97,12 +97,12 @@ var X86 = {
/*
* The following bits apply only when SEG is set
*/
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
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
WRITABLE: 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 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)
@ -116,23 +116,27 @@ var X86 = {
GATE_INT: 0x0600,
GATE_TRAP: 0x0700,
DATA_READONLY: 0x1000,
DATA_WRITEABLE: 0x1200,
DATA_WRITABLE: 0x1200,
DATA_EXPDOWN_READONLY: 0x1400,
DATA_EXPDOWN_WRITEABLE: 0x1600,
DATA_EXPDOWN_WRITABLE: 0x1600,
CODE_EXECONLY: 0x1800,
CODE_READABLE: 0x1a00,
CODE_CONFORMING_EXECONLY: 0x1c00,
CODE_CONFORMING_READABLE: 0x1e00
},
DPL: {
MASK: 0x6000,
SHIFT: 13
MASK: 0x6000,
SHIFT: 13
},
PRESENT: 0x8000
PRESENT: 0x8000
},
EXT: { // descriptor extension word (reserved on the 80286; "must be zero")
OFFSET: 0x6,
MASK: 0xffff
OFFSET: 0x6,
LIMIT1619: 0x000f,
AVAIL: 0x0010, // NOTE: set in various descriptors in OS/2
DEFSIZE: 0x0040, // clear if default operand/address size is 16-bit, set if 32-bit
GRANULARITY: 0x0080, // clear if limit is bytes, set if limit is 4Kb pages
BASE2431: 0xff00
}
},
/*