341 lines
12 KiB
C
341 lines
12 KiB
C
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/* $NetBSD: segments.h,v 1.54 2011/04/26 15:51:23 joerg Exp $ */
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/*-
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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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* @(#)segments.h 7.1 (Berkeley) 5/9/91
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*/
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/*-
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* Copyright (c) 1995, 1997
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* Charles M. Hannum. All rights reserved.
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* Copyright (c) 1989, 1990 William F. Jolitz
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* @(#)segments.h 7.1 (Berkeley) 5/9/91
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*/
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/*
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* 386 Segmentation Data Structures and definitions
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* William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
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*/
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#ifndef _I386_SEGMENTS_H_
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#define _I386_SEGMENTS_H_
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#ifdef _KERNEL_OPT
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#include "opt_xen.h"
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#endif
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/*
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* Selectors
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*/
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#define ISPL(s) ((s) & SEL_RPL) /* what is the priority level of a selector */
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#ifndef XEN
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#define SEL_KPL 0 /* kernel privilege level */
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#else
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#define SEL_XEN 0 /* Xen privilege level */
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#define SEL_KPL 1 /* kernel privilege level */
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#endif /* XEN */
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#define SEL_UPL 3 /* user privilege level */
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#define SEL_RPL 3 /* requester's privilege level mask */
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#ifdef XEN
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#define CHK_UPL 2 /* user privilege level mask */
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#else
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#define CHK_UPL SEL_RPL
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#endif /* XEN */
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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 IDXSELN(s) (((s) >> 3)) /* index of selector */
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#define GSEL(s,r) (((s) << 3) | r) /* a global selector */
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#define LSEL(s,r) (((s) << 3) | r | SEL_LDT) /* a local selector */
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#define GSYSSEL(s,r) GSEL(s,r) /* compat with amd64 */
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#if defined(_KERNEL_OPT)
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#include "opt_vm86.h"
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#endif
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#ifdef VM86
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#define USERMODE(c, f) (ISPL(c) == SEL_UPL || ((f) & PSL_VM) != 0)
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#define KERNELMODE(c, f) (ISPL(c) == SEL_KPL && ((f) & PSL_VM) == 0)
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#else
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#define USERMODE(c, f) (ISPL(c) == SEL_UPL)
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#define KERNELMODE(c, f) (ISPL(c) == SEL_KPL)
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#endif
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#ifndef _LOCORE
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#if __GNUC__ == 2 && __GNUC_MINOR__ < 7
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#pragma pack(1)
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#endif
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/*
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* Memory and System segment descriptors
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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) */
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unsigned sd_hibase:8; /* segment base address (msb) */
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} __packed;
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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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struct ldt_descriptor {
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vaddr_t ld_base;
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uint32_t ld_entries;
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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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struct ldt_descriptor ld;
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uint32_t raw[2];
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uint64_t raw64;
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} __packed;
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/*
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* region descriptors, used to load gdt/idt tables before segments yet exist.
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*/
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struct region_descriptor {
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unsigned rd_limit:16; /* segment extent */
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unsigned rd_base:32; /* base address */
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} __packed;
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#if __GNUC__ == 2 && __GNUC_MINOR__ < 7
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#pragma pack(4)
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#endif
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#ifdef _KERNEL
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extern union descriptor *gdt, *ldt;
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extern struct gate_descriptor *idt;
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void setgate(struct gate_descriptor *, void *, int, int, int, int);
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void setregion(struct region_descriptor *, void *, size_t);
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void setsegment(struct segment_descriptor *, const void *, size_t, int, int,
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int, int);
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void setgdt(int, const void *, size_t, int, int, int, int);
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void unsetgate(struct gate_descriptor *);
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void cpu_init_idt(void);
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void update_descriptor(union descriptor *, union descriptor *);
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#if !defined(XEN)
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void idt_init(void);
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void idt_vec_reserve(int);
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int idt_vec_alloc(int, int);
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void idt_vec_set(int, void (*)(void));
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void idt_vec_free(int);
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#endif
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#endif /* _KERNEL */
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#endif /* !_LOCORE */
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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_SYSNULL3 10 /* system null again */
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#define SDT_SYS386BSY 11 /* system 386 TSS busy */
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#define SDT_SYS386CGT 12 /* system 386 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_SYS386TGT 15 /* system 386 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 acessed */
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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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#define SDTYPE(p) (((const struct segment_descriptor *)(p))->sd_type)
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/* is memory segment descriptor pointer ? */
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#define ISMEMSDP(s) (SDTYPE(s) >= SDT_MEMRO && \
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SDTYPE(s) <= SDT_MEMERAC)
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/* is 286 gate descriptor pointer ? */
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#define IS286GDP(s) (SDTYPE(s) >= SDT_SYS286CGT && \
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SDTYPE(s) < SDT_SYS286TGT)
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/* is 386 gate descriptor pointer ? */
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#define IS386GDP(s) (SDTYPE(s) >= SDT_SYS386CGT && \
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SDTYPE(s) < SDT_SYS386TGT)
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/* is gate descriptor pointer ? */
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#define ISGDP(s) (IS286GDP(s) || IS386GDP(s))
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/* is segment descriptor pointer ? */
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#define ISSDP(s) (ISMEMSDP(s) || !ISGDP(s))
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/* is system segment descriptor pointer ? */
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#define ISSYSSDP(s) (!ISMEMSDP(s) && !ISGDP(s))
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/*
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* Segment Protection Exception code bits
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*/
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#define SEGEX_EXT 0x01 /* recursive or externally induced */
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#define SEGEX_IDT 0x02 /* interrupt descriptor table */
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#define SEGEX_TI 0x04 /* local descriptor table */
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/*
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* Entries in the Interrupt Descriptor Table (IDT)
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*/
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#define NIDT 256
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#define NRSVIDT 32 /* reserved entries for CPU exceptions */
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/*
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* Entries in the Global Descriptor Table (GDT).
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*
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* NB: If you change GBIOSCODE/GBIOSDATA, you *must* rebuild arch/i386/
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* bioscall/biostramp.inc, as that relies on GBIOSCODE/GBIOSDATA and a
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* normal kernel build does not rebuild it (it's merely included whole-
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* sale from i386/bioscall.s)
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*
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* Also, note that the GEXTBIOSDATA_SEL selector is special, as it maps
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* to the value 0x0040 (when created as a KPL global selector). Some
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* BIOSes reference the extended BIOS data area at segment 0040 in a non
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* relocatable fashion (even when in protected mode); mapping the zero page
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* via the GEXTBIOSDATA_SEL allows these buggy BIOSes to continue to work
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* under NetBSD.
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*
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* The order if the first 5 descriptors is special; the sysenter/sysexit
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* instructions depend on them.
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*/
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#define GNULL_SEL 0 /* Null descriptor */
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#define GCODE_SEL 1 /* Kernel code descriptor */
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#define GDATA_SEL 2 /* Kernel data descriptor */
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#define GUCODE_SEL 3 /* User code descriptor */
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#define GUDATA_SEL 4 /* User data descriptor */
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#define GLDT_SEL 5 /* Default LDT descriptor */
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#define GCPU_SEL 6 /* per-CPU segment */
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#define GEXTBIOSDATA_SEL 8 /* magic to catch BIOS refs to EBDA */
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#define GAPM32CODE_SEL 9 /* 3 APM segments must be consecutive */
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#define GAPM16CODE_SEL 10 /* and in the specified order: code32 */
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#define GAPMDATA_SEL 11 /* code16 and then data per APM spec */
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#define GBIOSCODE_SEL 12
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#define GBIOSDATA_SEL 13
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#define GPNPBIOSCODE_SEL 14
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#define GPNPBIOSDATA_SEL 15
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#define GPNPBIOSSCRATCH_SEL 16
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#define GPNPBIOSTRAMP_SEL 17
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#define GTRAPTSS_SEL 18
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#define GIPITSS_SEL 19
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#define GUCODEBIG_SEL 20 /* User code with executable stack */
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#define GUFS_SEL 21 /* Per-thread %fs */
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#define GUGS_SEL 22 /* Per-thread %gs */
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#define NGDT 23
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/*
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* Entries in the Local Descriptor Table (LDT).
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* DO NOT ADD KERNEL DATA/CODE SEGMENTS TO THIS TABLE.
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*/
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#define LSYS5CALLS_SEL 0 /* iBCS system call gate */
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#define LSYS5SIGR_SEL 1 /* iBCS sigreturn gate */
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#define LUCODE_SEL 2 /* User code descriptor */
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#define LUDATA_SEL 3 /* User data descriptor */
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#define LSOL26CALLS_SEL 4 /* Solaris 2.6 system call gate */
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#define LUCODEBIG_SEL 5 /* User code with executable stack */
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#define LBSDICALLS_SEL 16 /* BSDI system call gate */
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||
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#define NLDT 17
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||
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||
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#endif /* _I386_SEGMENTS_H_ */
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