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Diffstat (limited to 'sys/amd64/include/segments.h')
| -rw-r--r-- | sys/amd64/include/segments.h | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/sys/amd64/include/segments.h b/sys/amd64/include/segments.h deleted file mode 100644 index bc77569..0000000 --- a/sys/amd64/include/segments.h +++ /dev/null @@ -1,197 +0,0 @@ -/*- - * 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. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 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 - * $Id$ - */ - -/* - * 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 ; /* 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 acessed */ -#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 */ - -/* is memory segment descriptor pointer ? */ -#define ISMEMSDP(s) ((s->d_type) >= SDT_MEMRO && (s->d_type) <= SDT_MEMERAC) - -/* is 286 gate descriptor pointer ? */ -#define IS286GDP(s) (((s->d_type) >= SDT_SYS286CGT \ - && (s->d_type) < SDT_SYS286TGT)) - -/* is 386 gate descriptor pointer ? */ -#define IS386GDP(s) (((s->d_type) >= SDT_SYS386CGT \ - && (s->d_type) < SDT_SYS386TGT)) - -/* is gate descriptor pointer ? */ -#define ISGDP(s) (IS286GDP(s) || IS386GDP(s)) - -/* is segment descriptor pointer ? */ -#define ISSDP(s) (ISMEMSDP(s) || !ISGDP(s)) - -/* is system segment descriptor pointer ? */ -#define ISSYSSDP(s) (!ISMEMSDP(s) && !ISGDP(s)) - -/* - * 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)*/ -}; - -extern ssdtosd() ; /* to decode a ssd */ -extern sdtossd() ; /* to encode a sd */ - -/* - * 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; /* 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 -#define NRSVIDT 32 /* reserved entries for cpu exceptions */ |
