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freebsd-dev/sys/i386/include/segments.h

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Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
/*-
sys: further adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
2017-11-20 19:43:44 +00:00
* SPDX-License-Identifier: BSD-3-Clause
*
Initial import, 0.1 + pk 0.2.4-B1
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* 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.
Renumber copyright clause 4 Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00
* 3. Neither the name of the University nor the names of its contributors
Initial import, 0.1 + pk 0.2.4-B1
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* 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.
*
Removed all patch kit headers, sccsid and rcsid strings, put $Id$ in, some minor cleanup. Added $Id$ to files that did not have any version info, etc
1993-10-16 14:40:57 +00:00
* from: @(#)segments.h 7.1 (Berkeley) 5/9/91
$Id$ -> $FreeBSD$
1999-08-28 01:08:13 +00:00
* $FreeBSD$
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
*/
Made all header files idempotent and moved incorrect common data from headers into a related source file. Added cons.h as first step towards moving i386/i386/cons.h to machine/cons.h where it belongs.
1993-11-07 17:43:17 +00:00
#ifndef _MACHINE_SEGMENTS_H_
Make gdt_segs[] public again for APM. Make ldt[] public again and restore currentldt and _default_ldt for USER_LDT.
1994-11-15 14:12:55 +00:00
#define _MACHINE_SEGMENTS_H_
Made all header files idempotent and moved incorrect common data from headers into a related source file. Added cons.h as first step towards moving i386/i386/cons.h to machine/cons.h where it belongs.
1993-11-07 17:43:17 +00:00
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
/*
* 386 Segmentation Data Structures and definitions
* William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
*/
Move userland bits (and some common kernel bits) from amd64 and i386 segments.h to a new x86 segments.h. Add __packed attribute to some structs (just to be sure). Also make it clear that i386 GDT and LDT entries are used in ia64 code.
2012-03-19 21:24:50 +00:00
#include <x86/segments.h>
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
/*
* 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 {
use __packed, rather than __attribute__((packed)).
2002-09-23 06:50:07 +00:00
unsigned rd_limit:16; /* segment extent */
unsigned rd_base:32 __packed; /* base address */
Initial import, 0.1 + pk 0.2.4-B1
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};
/*
* 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 */
Add a missing open paren to a macro that's been broken (and apparently unused) since rev 1.1 so it is at least correct. Submitted by: Maxime Henrion <mux@qualys.com>
2001-12-04 00:35:28 +00:00
#define SEGEX_IDX(s) (((s)>>3)&0x1fff)
Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00
Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL" is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.
1999-12-29 04:46:21 +00:00
#ifdef _KERNEL
Make gdt_segs[] public again for APM. Make ldt[] public again and restore currentldt and _default_ldt for USER_LDT.
1994-11-15 14:12:55 +00:00
extern int _default_ldt;
i386 4/4G split. The change makes the user and kernel address spaces on i386 independent, giving each almost the full 4G of usable virtual addresses except for one PDE at top used for trampoline and per-CPU trampoline stacks, and system structures that must be always mapped, namely IDT, GDT, common TSS and LDT, and process-private TSS and LDT if allocated. By using 1:1 mapping for the kernel text and data, it appeared possible to eliminate assembler part of the locore.S which bootstraps initial page table and KPTmap. The code is rewritten in C and moved into the pmap_cold(). The comment in vmparam.h explains the KVA layout. There is no PCID mechanism available in protected mode, so each kernel/user switch forth and back completely flushes the TLB, except for the trampoline PTD region. The TLB invalidations for userspace becomes trivial, because IPI handlers switch page tables. On the other hand, context switches no longer need to reload %cr3. copyout(9) was rewritten to use vm_fault_quick_hold(). An issue for new copyout(9) is compatibility with wiring user buffers around sysctl handlers. This explains two kind of locks for copyout ptes and accounting of the vslock() calls. The vm_fault_quick_hold() AKA slow path, is only tried after the 'fast path' failed, which temporary changes mapping to the userspace and copies the data to/from small per-cpu buffer in the trampoline. If a page fault occurs during the copy, it is short-circuit by exception.s to not even reach C code. The change was motivated by the need to implement the Meltdown mitigation, but instead of KPTI the full split is done. The i386 architecture already shows the sizing problems, in particular, it is impossible to link clang and lld with debugging. I expect that the issues due to the virtual address space limits would only exaggerate and the split gives more liveness to the platform. Tested by: pho Discussed with: bde Sponsored by: The FreeBSD Foundation MFC after: 1 month Differential revision: https://reviews.freebsd.org/D14633
2018-04-13 20:30:49 +00:00
extern union descriptor *gdt;
extern union descriptor *ldt;
Make gdt_segs[] public again for APM. Make ldt[] public again and restore currentldt and _default_ldt for USER_LDT.
1994-11-15 14:12:55 +00:00
extern struct soft_segment_descriptor gdt_segs[];
Changed the global `idt' from an array to a pointer so that npx.c automatically hacks on the active copy of the IDT if f00f_hack() has changed it. This also allows simplifications in setidt(). This fixes breakage of FP exception handling by rev.1.55 of sys/kernel.h. FP exceptions were sent to npx.c's probe handlers because npx.c "restored" the old handlers to the wrong copy of the IDT. The SYSINIT for f00f_hack() was purposely run quite late to avoid problems like this, but it is bogusly associated with the SYSINIT for proc0 so it was moved with the latter. Problem reported and fix tested by: Martin Cracauer <cracauer@cons.org>
1999-06-18 14:32:21 +00:00
extern struct gate_descriptor *idt;
Remove 1.5+K of bloat for unused idt entries. Partly support BDE_DEBUGGER. Still broken by conflict with APM. Does nothing if BDE_DEBUGGER is not defined. Clean up prototypes and data declarations. Declare most of the segment functions that are implemented in support.s. Make data private in machdep.c if possible. Parenthesize expressions in macros properly! ${Uniformize idempotency ifdef}.
1994-11-14 14:18:15 +00:00
Fixed some style bugs in the removal of __P(()). The main ones were not removing tabs before "__P((", and not outdenting continuation lines to preserve non-KNF lining up of code with parentheses. Switch to KNF formatting and/or rewrap the whole prototype in some cases.
2002-03-23 15:09:35 +00:00
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);
Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL" is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.
1999-12-29 04:46:21 +00:00
#endif /* _KERNEL */
Remove 1.5+K of bloat for unused idt entries. Partly support BDE_DEBUGGER. Still broken by conflict with APM. Does nothing if BDE_DEBUGGER is not defined. Clean up prototypes and data declarations. Declare most of the segment functions that are implemented in support.s. Make data private in machdep.c if possible. Parenthesize expressions in macros properly! ${Uniformize idempotency ifdef}.
1994-11-14 14:18:15 +00:00
#endif /* !_MACHINE_SEGMENTS_H_ */
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