f36cfd49ad
license, per letter dated July 22, 1999 and email from Peter Wemm, Alan Cox and Robert Watson. Approved by: core, peter, alc, rwatson
251 lines
9.6 KiB
C
251 lines
9.6 KiB
C
/*-
|
|
* Copyright (c) 1989, 1990 William F. Jolitz
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* William Jolitz.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from: @(#)segments.h 7.1 (Berkeley) 5/9/91
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_SEGMENTS_H_
|
|
#define _MACHINE_SEGMENTS_H_
|
|
|
|
/*
|
|
* 386 Segmentation Data Structures and definitions
|
|
* William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
|
|
*/
|
|
|
|
/*
|
|
* Selectors
|
|
*/
|
|
|
|
#define ISPL(s) ((s)&3) /* what is the priority level of a selector */
|
|
#define SEL_KPL 0 /* kernel priority level */
|
|
#define SEL_UPL 3 /* user priority level */
|
|
#define ISLDT(s) ((s)&SEL_LDT) /* is it local or global */
|
|
#define SEL_LDT 4 /* local descriptor table */
|
|
#define IDXSEL(s) (((s)>>3) & 0x1fff) /* index of selector */
|
|
#define LSEL(s,r) (((s)<<3) | SEL_LDT | r) /* a local selector */
|
|
#define GSEL(s,r) (((s)<<3) | r) /* a global selector */
|
|
|
|
/*
|
|
* Memory and System segment descriptors
|
|
*/
|
|
struct segment_descriptor {
|
|
unsigned sd_lolimit:16 ; /* segment extent (lsb) */
|
|
unsigned sd_lobase:24 __packed; /* segment base address (lsb) */
|
|
unsigned sd_type:5 ; /* segment type */
|
|
unsigned sd_dpl:2 ; /* segment descriptor priority level */
|
|
unsigned sd_p:1 ; /* segment descriptor present */
|
|
unsigned sd_hilimit:4 ; /* segment extent (msb) */
|
|
unsigned sd_xx:2 ; /* unused */
|
|
unsigned sd_def32:1 ; /* default 32 vs 16 bit size */
|
|
unsigned sd_gran:1 ; /* limit granularity (byte/page units)*/
|
|
unsigned sd_hibase:8 ; /* segment base address (msb) */
|
|
} ;
|
|
|
|
/*
|
|
* Gate descriptors (e.g. indirect descriptors)
|
|
*/
|
|
struct gate_descriptor {
|
|
unsigned gd_looffset:16 ; /* gate offset (lsb) */
|
|
unsigned gd_selector:16 ; /* gate segment selector */
|
|
unsigned gd_stkcpy:5 ; /* number of stack wds to cpy */
|
|
unsigned gd_xx:3 ; /* unused */
|
|
unsigned gd_type:5 ; /* segment type */
|
|
unsigned gd_dpl:2 ; /* segment descriptor priority level */
|
|
unsigned gd_p:1 ; /* segment descriptor present */
|
|
unsigned gd_hioffset:16 ; /* gate offset (msb) */
|
|
} ;
|
|
|
|
/*
|
|
* Generic descriptor
|
|
*/
|
|
union descriptor {
|
|
struct segment_descriptor sd;
|
|
struct gate_descriptor gd;
|
|
};
|
|
|
|
/* system segments and gate types */
|
|
#define SDT_SYSNULL 0 /* system null */
|
|
#define SDT_SYS286TSS 1 /* system 286 TSS available */
|
|
#define SDT_SYSLDT 2 /* system local descriptor table */
|
|
#define SDT_SYS286BSY 3 /* system 286 TSS busy */
|
|
#define SDT_SYS286CGT 4 /* system 286 call gate */
|
|
#define SDT_SYSTASKGT 5 /* system task gate */
|
|
#define SDT_SYS286IGT 6 /* system 286 interrupt gate */
|
|
#define SDT_SYS286TGT 7 /* system 286 trap gate */
|
|
#define SDT_SYSNULL2 8 /* system null again */
|
|
#define SDT_SYS386TSS 9 /* system 386 TSS available */
|
|
#define SDT_SYSNULL3 10 /* system null again */
|
|
#define SDT_SYS386BSY 11 /* system 386 TSS busy */
|
|
#define SDT_SYS386CGT 12 /* system 386 call gate */
|
|
#define SDT_SYSNULL4 13 /* system null again */
|
|
#define SDT_SYS386IGT 14 /* system 386 interrupt gate */
|
|
#define SDT_SYS386TGT 15 /* system 386 trap gate */
|
|
|
|
/* memory segment types */
|
|
#define SDT_MEMRO 16 /* memory read only */
|
|
#define SDT_MEMROA 17 /* memory read only accessed */
|
|
#define SDT_MEMRW 18 /* memory read write */
|
|
#define SDT_MEMRWA 19 /* memory read write accessed */
|
|
#define SDT_MEMROD 20 /* memory read only expand dwn limit */
|
|
#define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */
|
|
#define SDT_MEMRWD 22 /* memory read write expand dwn limit */
|
|
#define SDT_MEMRWDA 23 /* memory read write expand dwn limit accessed */
|
|
#define SDT_MEME 24 /* memory execute only */
|
|
#define SDT_MEMEA 25 /* memory execute only accessed */
|
|
#define SDT_MEMER 26 /* memory execute read */
|
|
#define SDT_MEMERA 27 /* memory execute read accessed */
|
|
#define SDT_MEMEC 28 /* memory execute only conforming */
|
|
#define SDT_MEMEAC 29 /* memory execute only accessed conforming */
|
|
#define SDT_MEMERC 30 /* memory execute read conforming */
|
|
#define SDT_MEMERAC 31 /* memory execute read accessed conforming */
|
|
|
|
/*
|
|
* Software definitions are in this convenient format,
|
|
* which are translated into inconvenient segment descriptors
|
|
* when needed to be used by the 386 hardware
|
|
*/
|
|
|
|
struct soft_segment_descriptor {
|
|
unsigned ssd_base ; /* segment base address */
|
|
unsigned ssd_limit ; /* segment extent */
|
|
unsigned ssd_type:5 ; /* segment type */
|
|
unsigned ssd_dpl:2 ; /* segment descriptor priority level */
|
|
unsigned ssd_p:1 ; /* segment descriptor present */
|
|
unsigned ssd_xx:4 ; /* unused */
|
|
unsigned ssd_xx1:2 ; /* unused */
|
|
unsigned ssd_def32:1 ; /* default 32 vs 16 bit size */
|
|
unsigned ssd_gran:1 ; /* limit granularity (byte/page units)*/
|
|
};
|
|
|
|
/*
|
|
* region descriptors, used to load gdt/idt tables before segments yet exist.
|
|
*/
|
|
struct region_descriptor {
|
|
unsigned rd_limit:16; /* segment extent */
|
|
unsigned rd_base:32 __packed; /* base address */
|
|
};
|
|
|
|
/*
|
|
* Segment Protection Exception code bits
|
|
*/
|
|
|
|
#define SEGEX_EXT 0x01 /* recursive or externally induced */
|
|
#define SEGEX_IDT 0x02 /* interrupt descriptor table */
|
|
#define SEGEX_TI 0x04 /* local descriptor table */
|
|
/* other bits are affected descriptor index */
|
|
#define SEGEX_IDX(s) (((s)>>3)&0x1fff)
|
|
|
|
/*
|
|
* Size of IDT table
|
|
*/
|
|
|
|
#define NIDT 256 /* 32 reserved, 0x80 syscall, most are h/w */
|
|
#define NRSVIDT 32 /* reserved entries for cpu exceptions */
|
|
|
|
/*
|
|
* Entries in the Interrupt Descriptor Table (IDT)
|
|
*/
|
|
#define IDT_DE 0 /* #DE: Divide Error */
|
|
#define IDT_DB 1 /* #DB: Debug */
|
|
#define IDT_NMI 2 /* Nonmaskable External Interrupt */
|
|
#define IDT_BP 3 /* #BP: Breakpoint */
|
|
#define IDT_OF 4 /* #OF: Overflow */
|
|
#define IDT_BR 5 /* #BR: Bound Range Exceeded */
|
|
#define IDT_UD 6 /* #UD: Undefined/Invalid Opcode */
|
|
#define IDT_NM 7 /* #NM: No Math Coprocessor */
|
|
#define IDT_DF 8 /* #DF: Double Fault */
|
|
#define IDT_FPUGP 9 /* Coprocessor Segment Overrun */
|
|
#define IDT_TS 10 /* #TS: Invalid TSS */
|
|
#define IDT_NP 11 /* #NP: Segment Not Present */
|
|
#define IDT_SS 12 /* #SS: Stack Segment Fault */
|
|
#define IDT_GP 13 /* #GP: General Protection Fault */
|
|
#define IDT_PF 14 /* #PF: Page Fault */
|
|
#define IDT_MF 16 /* #MF: FPU Floating-Point Error */
|
|
#define IDT_AC 17 /* #AC: Alignment Check */
|
|
#define IDT_MC 18 /* #MC: Machine Check */
|
|
#define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */
|
|
#define IDT_IO_INTS NRSVIDT /* Base of IDT entries for I/O interrupts. */
|
|
#define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */
|
|
|
|
/*
|
|
* Entries in the Global Descriptor Table (GDT)
|
|
*/
|
|
#define GNULL_SEL 0 /* Null Descriptor */
|
|
#define GCODE_SEL 1 /* Kernel Code Descriptor */
|
|
#define GDATA_SEL 2 /* Kernel Data Descriptor */
|
|
#define GPRIV_SEL 3 /* SMP Per-Processor Private Data */
|
|
#define GPROC0_SEL 4 /* Task state process slot zero and up */
|
|
#define GLDT_SEL 5 /* LDT - eventually one per process */
|
|
#define GUSERLDT_SEL 6 /* User LDT */
|
|
#define GTGATE_SEL 7 /* Process task switch gate */
|
|
#define GBIOSLOWMEM_SEL 8 /* BIOS low memory access (must be entry 8) */
|
|
#define GPANIC_SEL 9 /* Task state to consider panic from */
|
|
#define GBIOSCODE32_SEL 10 /* BIOS interface (32bit Code) */
|
|
#define GBIOSCODE16_SEL 11 /* BIOS interface (16bit Code) */
|
|
#define GBIOSDATA_SEL 12 /* BIOS interface (Data) */
|
|
#define GBIOSUTIL_SEL 13 /* BIOS interface (Utility) */
|
|
#define GBIOSARGS_SEL 14 /* BIOS interface (Arguments) */
|
|
|
|
#define NGDT 15
|
|
|
|
/*
|
|
* Entries in the Local Descriptor Table (LDT)
|
|
*/
|
|
#define LSYS5CALLS_SEL 0 /* forced by intel BCS */
|
|
#define LSYS5SIGR_SEL 1
|
|
#define L43BSDCALLS_SEL 2 /* notyet */
|
|
#define LUCODE_SEL 3
|
|
#define LSOL26CALLS_SEL 4 /* Solaris >= 2.6 system call gate */
|
|
#define LUDATA_SEL 5
|
|
/* separate stack, es,fs,gs sels ? */
|
|
/* #define LPOSIXCALLS_SEL 5*/ /* notyet */
|
|
#define LBSDICALLS_SEL 16 /* BSDI system call gate */
|
|
#define NLDT (LBSDICALLS_SEL + 1)
|
|
|
|
#ifdef _KERNEL
|
|
extern int _default_ldt;
|
|
extern union descriptor gdt[];
|
|
extern struct soft_segment_descriptor gdt_segs[];
|
|
extern struct gate_descriptor *idt;
|
|
extern union descriptor ldt[NLDT];
|
|
extern struct region_descriptor r_gdt, r_idt;
|
|
|
|
void lgdt(struct region_descriptor *rdp);
|
|
void sdtossd(struct segment_descriptor *sdp,
|
|
struct soft_segment_descriptor *ssdp);
|
|
void ssdtosd(struct soft_segment_descriptor *ssdp,
|
|
struct segment_descriptor *sdp);
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* !_MACHINE_SEGMENTS_H_ */
|