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9d24f98ca8
An extra copy of the system call gate was added to the default LDT back in 1996 (r18513 / r18514). However, the ability to run BSD/OS 2.1 i386 binaries under FreeBSD's native ABI is most likely no longer needed. Discussed with: kib
278 lines
11 KiB
C
278 lines
11 KiB
C
/*-
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* Copyright (c) 1989, 1990 William F. Jolitz
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)segments.h 7.1 (Berkeley) 5/9/91
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* $FreeBSD$
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*/
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#ifndef _X86_SEGMENTS_H_
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#define _X86_SEGMENTS_H_
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/*
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* X86 Segmentation Data Structures and definitions
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*/
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/*
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* Selectors
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*/
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#define SEL_RPL_MASK 3 /* requester priv level */
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#define ISPL(s) ((s)&3) /* priority level of a selector */
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#define SEL_KPL 0 /* kernel priority level */
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#define SEL_UPL 3 /* user priority level */
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#define ISLDT(s) ((s)&SEL_LDT) /* is it local or global */
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#define SEL_LDT 4 /* local descriptor table */
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#define IDXSEL(s) (((s)>>3) & 0x1fff) /* index of selector */
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#define LSEL(s,r) (((s)<<3) | SEL_LDT | r) /* a local selector */
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#define GSEL(s,r) (((s)<<3) | r) /* a global selector */
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/*
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* User segment descriptors (%cs, %ds etc for i386 apps. 64 bit wide)
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* For long-mode apps, %cs only has the conforming bit in sd_type, the sd_dpl,
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* sd_p, sd_l and sd_def32 which must be zero). %ds only has sd_p.
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*/
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struct segment_descriptor {
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unsigned sd_lolimit:16; /* segment extent (lsb) */
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unsigned sd_lobase:24; /* segment base address (lsb) */
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unsigned sd_type:5; /* segment type */
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unsigned sd_dpl:2; /* segment descriptor priority level */
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unsigned sd_p:1; /* segment descriptor present */
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unsigned sd_hilimit:4; /* segment extent (msb) */
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unsigned sd_xx:2; /* unused */
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unsigned sd_def32:1; /* default 32 vs 16 bit size */
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unsigned sd_gran:1; /* limit granularity (byte/page units)*/
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unsigned sd_hibase:8; /* segment base address (msb) */
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} __packed;
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struct user_segment_descriptor {
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unsigned sd_lolimit:16; /* segment extent (lsb) */
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unsigned sd_lobase:24; /* segment base address (lsb) */
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unsigned sd_type:5; /* segment type */
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unsigned sd_dpl:2; /* segment descriptor priority level */
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unsigned sd_p:1; /* segment descriptor present */
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unsigned sd_hilimit:4; /* segment extent (msb) */
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unsigned sd_xx:1; /* unused */
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unsigned sd_long:1; /* long mode (cs only) */
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unsigned sd_def32:1; /* default 32 vs 16 bit size */
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unsigned sd_gran:1; /* limit granularity (byte/page units)*/
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unsigned sd_hibase:8; /* segment base address (msb) */
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} __packed;
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#define USD_GETBASE(sd) (((sd)->sd_lobase) | (sd)->sd_hibase << 24)
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#define USD_SETBASE(sd, b) (sd)->sd_lobase = (b); \
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(sd)->sd_hibase = ((b) >> 24);
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#define USD_GETLIMIT(sd) (((sd)->sd_lolimit) | (sd)->sd_hilimit << 16)
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#define USD_SETLIMIT(sd, l) (sd)->sd_lolimit = (l); \
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(sd)->sd_hilimit = ((l) >> 16);
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#ifdef __i386__
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/*
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* Gate descriptors (e.g. indirect descriptors)
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*/
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struct gate_descriptor {
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unsigned gd_looffset:16; /* gate offset (lsb) */
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unsigned gd_selector:16; /* gate segment selector */
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unsigned gd_stkcpy:5; /* number of stack wds to cpy */
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unsigned gd_xx:3; /* unused */
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unsigned gd_type:5; /* segment type */
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unsigned gd_dpl:2; /* segment descriptor priority level */
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unsigned gd_p:1; /* segment descriptor present */
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unsigned gd_hioffset:16; /* gate offset (msb) */
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} __packed;
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/*
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* Generic descriptor
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*/
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union descriptor {
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struct segment_descriptor sd;
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struct gate_descriptor gd;
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};
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#else
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/*
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* Gate descriptors (e.g. indirect descriptors, trap, interrupt etc. 128 bit)
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* Only interrupt and trap gates have gd_ist.
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*/
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struct gate_descriptor {
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uint64_t gd_looffset:16; /* gate offset (lsb) */
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uint64_t gd_selector:16; /* gate segment selector */
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uint64_t gd_ist:3; /* IST table index */
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uint64_t gd_xx:5; /* unused */
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uint64_t gd_type:5; /* segment type */
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uint64_t gd_dpl:2; /* segment descriptor priority level */
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uint64_t gd_p:1; /* segment descriptor present */
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uint64_t gd_hioffset:48; /* gate offset (msb) */
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uint64_t sd_xx1:32;
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} __packed;
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/*
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* Generic descriptor
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*/
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union descriptor {
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struct user_segment_descriptor sd;
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struct gate_descriptor gd;
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};
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#endif
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/* system segments and gate types */
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#define SDT_SYSNULL 0 /* system null */
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#define SDT_SYS286TSS 1 /* system 286 TSS available */
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#define SDT_SYSLDT 2 /* system local descriptor table */
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#define SDT_SYS286BSY 3 /* system 286 TSS busy */
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#define SDT_SYS286CGT 4 /* system 286 call gate */
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#define SDT_SYSTASKGT 5 /* system task gate */
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#define SDT_SYS286IGT 6 /* system 286 interrupt gate */
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#define SDT_SYS286TGT 7 /* system 286 trap gate */
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#define SDT_SYSNULL2 8 /* system null again */
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#define SDT_SYS386TSS 9 /* system 386 TSS available */
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#define SDT_SYSTSS 9 /* system available 64 bit TSS */
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#define SDT_SYSNULL3 10 /* system null again */
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#define SDT_SYS386BSY 11 /* system 386 TSS busy */
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#define SDT_SYSBSY 11 /* system busy 64 bit TSS */
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#define SDT_SYS386CGT 12 /* system 386 call gate */
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#define SDT_SYSCGT 12 /* system 64 bit call gate */
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#define SDT_SYSNULL4 13 /* system null again */
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#define SDT_SYS386IGT 14 /* system 386 interrupt gate */
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#define SDT_SYSIGT 14 /* system 64 bit interrupt gate */
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#define SDT_SYS386TGT 15 /* system 386 trap gate */
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#define SDT_SYSTGT 15 /* system 64 bit trap gate */
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/* memory segment types */
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#define SDT_MEMRO 16 /* memory read only */
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#define SDT_MEMROA 17 /* memory read only accessed */
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#define SDT_MEMRW 18 /* memory read write */
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#define SDT_MEMRWA 19 /* memory read write accessed */
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#define SDT_MEMROD 20 /* memory read only expand dwn limit */
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#define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */
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#define SDT_MEMRWD 22 /* memory read write expand dwn limit */
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#define SDT_MEMRWDA 23 /* memory read write expand dwn limit accessed*/
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#define SDT_MEME 24 /* memory execute only */
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#define SDT_MEMEA 25 /* memory execute only accessed */
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#define SDT_MEMER 26 /* memory execute read */
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#define SDT_MEMERA 27 /* memory execute read accessed */
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#define SDT_MEMEC 28 /* memory execute only conforming */
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#define SDT_MEMEAC 29 /* memory execute only accessed conforming */
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#define SDT_MEMERC 30 /* memory execute read conforming */
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#define SDT_MEMERAC 31 /* memory execute read accessed conforming */
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/*
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* Size of IDT table
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*/
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#define NIDT 256 /* 32 reserved, 0x80 syscall, most are h/w */
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#define NRSVIDT 32 /* reserved entries for cpu exceptions */
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/*
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* Entries in the Interrupt Descriptor Table (IDT)
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*/
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#define IDT_DE 0 /* #DE: Divide Error */
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#define IDT_DB 1 /* #DB: Debug */
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#define IDT_NMI 2 /* Nonmaskable External Interrupt */
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#define IDT_BP 3 /* #BP: Breakpoint */
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#define IDT_OF 4 /* #OF: Overflow */
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#define IDT_BR 5 /* #BR: Bound Range Exceeded */
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#define IDT_UD 6 /* #UD: Undefined/Invalid Opcode */
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#define IDT_NM 7 /* #NM: No Math Coprocessor */
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#define IDT_DF 8 /* #DF: Double Fault */
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#define IDT_FPUGP 9 /* Coprocessor Segment Overrun */
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#define IDT_TS 10 /* #TS: Invalid TSS */
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#define IDT_NP 11 /* #NP: Segment Not Present */
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#define IDT_SS 12 /* #SS: Stack Segment Fault */
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#define IDT_GP 13 /* #GP: General Protection Fault */
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#define IDT_PF 14 /* #PF: Page Fault */
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#define IDT_MF 16 /* #MF: FPU Floating-Point Error */
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#define IDT_AC 17 /* #AC: Alignment Check */
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#define IDT_MC 18 /* #MC: Machine Check */
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#define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */
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#define IDT_IO_INTS NRSVIDT /* Base of IDT entries for I/O interrupts. */
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#define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */
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#define IDT_DTRACE_RET 0x92 /* DTrace pid provider Interrupt Vector */
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#define IDT_EVTCHN 0x93 /* Xen HVM Event Channel Interrupt Vector */
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#if defined(__i386__)
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/*
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* Entries in the Global Descriptor Table (GDT)
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* Note that each 4 entries share a single 32 byte L1 cache line.
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* Some of the fast syscall instructions require a specific order here.
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*/
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#define GNULL_SEL 0 /* Null Descriptor */
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#define GPRIV_SEL 1 /* SMP Per-Processor Private Data */
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#define GUFS_SEL 2 /* User %fs Descriptor (order critical: 1) */
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#define GUGS_SEL 3 /* User %gs Descriptor (order critical: 2) */
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#define GCODE_SEL 4 /* Kernel Code Descriptor (order critical: 1) */
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#define GDATA_SEL 5 /* Kernel Data Descriptor (order critical: 2) */
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#define GUCODE_SEL 6 /* User Code Descriptor (order critical: 3) */
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#define GUDATA_SEL 7 /* User Data Descriptor (order critical: 4) */
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#define GBIOSLOWMEM_SEL 8 /* BIOS low memory access (must be entry 8) */
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#define GPROC0_SEL 9 /* Task state process slot zero and up */
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#define GLDT_SEL 10 /* Default User LDT */
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#define GUSERLDT_SEL 11 /* User LDT */
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#define GPANIC_SEL 12 /* Task state to consider panic from */
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#define GBIOSCODE32_SEL 13 /* BIOS interface (32bit Code) */
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#define GBIOSCODE16_SEL 14 /* BIOS interface (16bit Code) */
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#define GBIOSDATA_SEL 15 /* BIOS interface (Data) */
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#define GBIOSUTIL_SEL 16 /* BIOS interface (Utility) */
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#define GBIOSARGS_SEL 17 /* BIOS interface (Arguments) */
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#define GNDIS_SEL 18 /* For the NDIS layer */
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#define NGDT 19
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/*
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* Entries in the Local Descriptor Table (LDT)
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*/
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#define LSYS5CALLS_SEL 0 /* forced by intel BCS */
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#define LSYS5SIGR_SEL 1
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#define L43BSDCALLS_SEL 2 /* notyet */
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#define LUCODE_SEL 3
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#define LUDATA_SEL 5
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/* separate stack, es,fs,gs sels ? */
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/* #define LPOSIXCALLS_SEL 5*/ /* notyet */
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#define NLDT (LUDATA_SEL + 1)
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#else /* !__i386__ */
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/*
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* Entries in the Global Descriptor Table (GDT)
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*/
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#define GNULL_SEL 0 /* Null Descriptor */
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#define GNULL2_SEL 1 /* Null Descriptor */
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#define GUFS32_SEL 2 /* User 32 bit %fs Descriptor */
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#define GUGS32_SEL 3 /* User 32 bit %gs Descriptor */
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#define GCODE_SEL 4 /* Kernel Code Descriptor */
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#define GDATA_SEL 5 /* Kernel Data Descriptor */
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#define GUCODE32_SEL 6 /* User 32 bit code Descriptor */
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#define GUDATA_SEL 7 /* User 32/64 bit Data Descriptor */
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#define GUCODE_SEL 8 /* User 64 bit Code Descriptor */
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#define GPROC0_SEL 9 /* TSS for entering kernel etc */
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/* slot 10 is second half of GPROC0_SEL */
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#define GUSERLDT_SEL 11 /* LDT */
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/* slot 12 is second half of GUSERLDT_SEL */
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#define NGDT 13
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#endif /* __i386__ */
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#endif /* !_X86_SEGMENTS_H_ */
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