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Length: 4962 (0x1362)
Types: TextFile
Notes: UNIX file
Names: »seg.h«
└─⟦a6ab2eb36⟧ Bits:30004042/kconfig3.imd SW95705I 386/ix Multi-user Release 1.2
└─⟦a6ab2eb36⟧ UNIX Filesystem
└─⟦this⟧ »kc/new/usr/include/sys/seg.h«
/* Copyright (c) 1987 AT&T */
/* All Rights Reserved */
/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
/* The copyright notice above does not evidence any */
/* actual or intended publication of such source code. */
#ident "@(#)seg.h 1.10 - 87/07/31"
/*
* The segment structure is prototype and place holder for segment descriptors
* s_base contains the 32 bit base field of the descriptor.
* s_limacc contains 20 limit bits and 12 accbits in this order
*
* 0 19 20 21 22 23 24 25,26 27-31
* _____________________________________________________________________________
* | |
* | 20 bit limit field | G | B or D | 0 | AVL | P | DPL | Other Attributes|
* |___________________________________________________________________________|
*
* The structure gets fixed up at run time to look like a descriptor
*
*/
/* segment */
struct seg_desc {
unsigned long s_base; /* segment base */
unsigned long s_limacc; /* 4 limit and access bytes */
};
/* descriptor */
struct dscr {
unsigned int a_lim0015:16,
a_base0015:16,
a_base1623:8,
a_acc0007:8,
a_lim1619:4,
a_acc0811:4,
a_base2431:8;
};
/* access rights for data segments */
#define UDATA_ACC1 0xF2 /* present dpl=3 writable */
#define KDATA_ACC1 0x92 /* present dpl=0 writable */
#define DATA_ACC2 0xC /* 1byte gran. 4Gb limit avl=0 */
#define UTEXT_ACC1 0xFA /* present dpl=3 readable */
#define KTEXT_ACC1 0x9A /* present dpl=0 readable */
#define TEXT_ACC2 0xC /* 1byte gran., 32 bit operands avl=0 */
#define LDT_UACC1 0xE2 /* present dpl=3 type=ldt */
#define LDT_KACC1 0x82 /* present dpl=0 type=ldt */
#define LDT_ACC2 0x0 /* G=0 avl=0*/
#define TSS3_KACC1 0x89 /* present dpl=0 type=available 386 TSS */
#define TSS3_KBACC1 0x8B /* present dpl=0 type=busy 386 TSS */
#define TSS2_KACC1 0x81 /* present dpl=0 type=available 286 TSS */
#define TSS3_UACC1 0xE9 /* present dpl=3 type=available 386 TSS */
#define TGATE_UACC1 0xE5 /* present dpl=3 type=task gate */
#define TSS2_UACC1 0xE1 /* present dpl=3 type=available 286 TSS */
#define TSS_ACC2 0x0 /* g=0 avl=0 */
#define MKDSCR(base, limit, acc1, acc2) {(long)base, ((long)limit|(acc2<<20)|(acc1<<24))}
/* selector definitions */
/*#define LDTSEL 0x58 /* LDT for the current process */
#define LDTSEL 0x140 /* LDT for the current process */
/*#define UTSSSEL 0x60 /* TSS for the current process */
#define UTSSSEL 0x148 /* TSS for the current process */
/*#define KTSSSEL 0x68 /* TSS for the scheduler */
#define KTSSSEL 0x150 /* TSS for the scheduler */
/*#define KCSSEL 0x70 /* kernel code segment selector */
#define KCSSEL 0x158 /* kernel code segment selector */
/*#define KDSSEL 0x78 /* kernel data segment selector */
#define KDSSEL 0x160 /* kernel data segment selector */
/*#define DFTSSSEL 0x80 /* TSS for double fault handler */
#define DFTSSSEL 0x168 /* TSS for double fault handler */
/*#define JTSSSEL 0x88 /* Junk TSS to jump thru */
#define JTSSSEL 0x170
#define MON1SEL 0x178 /* Selector to get to monitor int 1 handler */
#define MON3SEL 0x180 /* Selector to get to monitor int 3 handler */
#ifdef VPIX
#define XTSSSEL 0x188 /* XTSS for dual-mode processes */
#endif
/* user selectors */
#define USER_CS 0x17 /* user's code segment */
#define USER_DS 0x1F /* user's data segment */
#define USER_SCALL 0x07 /* call gate for system calls */
#define USER_SIGCALL 0x0F /* call gate for sigreturn */
#define IDTSZ 256
#define MONIDTSZ 16
#define LDTSZ 256
#define GDTSZ 90
#define KTBASE 0xC0008000
#define KDBASE 0xC0068000
/*
* Call/Interrupt/Trap Gate table descriptions
*
* This is the structure used for declaration of Gates.
* If this is changed in any way, the code in uprt.s
* must be changed to match. It is especially important
* that the type byte be in the last position so that the
* real mode start up code can determine if the gate is
* intended to be a gate or segment descriptor.
*/
struct gate_desc {
unsigned long g_off; /* offset */
unsigned short g_sel; /* selector */
unsigned char g_wcount; /* word count */
unsigned char g_type; /* type of gate and access rights */
};
/* access rights field for gates */
#define GATE_UACC 0xE0 /* present and dpl = 3 */
#define GATE_KACC 0x80 /* present and dpl = 0 */
#define GATE_386CALL 0xC /* 386 call gate */
#define GATE_386INT 0xE /* 386 int gate */
#define GATE_386TRP 0xF /* 386 trap gate */
#define GATE_TSS 0x5 /* Task gate */
/* make an interrupt gate */
#define MKINTG(rtn) {(long)rtn,(short)KCSSEL,(char)0,(char)(GATE_KACC|GATE_386INT)}
#define MKKTRPG(rtn) {(long)rtn,(short)KCSSEL,(char)0,(char)(GATE_KACC|GATE_386TRP)}
#define MKUTRPG(rtn) {(long)rtn,(short)KCSSEL,(char)0,(char)(GATE_UACC|GATE_386TRP)}
#define seltoi(sel) ((unsigned short)(sel) >> 3)