256 lines
10 KiB
C
256 lines
10 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_
|
|
|
|
/*
|
|
* AMD64 Segmentation Data Structures and definitions
|
|
*/
|
|
|
|
/*
|
|
* Selectors
|
|
*/
|
|
|
|
#define SEL_RPL_MASK 3 /* requester priv level */
|
|
#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 */
|
|
|
|
/*
|
|
* User segment descriptors (%cs, %ds etc for compatability apps. 64 bit wide)
|
|
* For long-mode apps, %cs only has the conforming bit in sd_type, the sd_dpl,
|
|
* sd_p, sd_l and sd_def32 which must be zero). %ds only has sd_p.
|
|
*/
|
|
struct user_segment_descriptor {
|
|
u_int64_t sd_lolimit:16; /* segment extent (lsb) */
|
|
u_int64_t sd_lobase:24; /* segment base address (lsb) */
|
|
u_int64_t sd_type:5; /* segment type */
|
|
u_int64_t sd_dpl:2; /* segment descriptor priority level */
|
|
u_int64_t sd_p:1; /* segment descriptor present */
|
|
u_int64_t sd_hilimit:4; /* segment extent (msb) */
|
|
u_int64_t sd_xx:1; /* unused */
|
|
u_int64_t sd_long:1; /* long mode (cs only) */
|
|
u_int64_t sd_def32:1; /* default 32 vs 16 bit size */
|
|
u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/
|
|
u_int64_t sd_hibase:8; /* segment base address (msb) */
|
|
} __packed;
|
|
|
|
#define USD_GETBASE(sd) (((sd)->sd_lobase) | (sd)->sd_hibase << 24)
|
|
#define USD_SETBASE(sd, b) (sd)->sd_lobase = (b); \
|
|
(sd)->sd_hibase = ((b) >> 24);
|
|
#define USD_GETLIMIT(sd) (((sd)->sd_lolimit) | (sd)->sd_hilimit << 16)
|
|
#define USD_SETLIMIT(sd, l) (sd)->sd_lolimit = (l); \
|
|
(sd)->sd_hilimit = ((l) >> 16);
|
|
|
|
/*
|
|
* System segment descriptors (128 bit wide)
|
|
*/
|
|
struct system_segment_descriptor {
|
|
u_int64_t sd_lolimit:16; /* segment extent (lsb) */
|
|
u_int64_t sd_lobase:24; /* segment base address (lsb) */
|
|
u_int64_t sd_type:5; /* segment type */
|
|
u_int64_t sd_dpl:2; /* segment descriptor priority level */
|
|
u_int64_t sd_p:1; /* segment descriptor present */
|
|
u_int64_t sd_hilimit:4; /* segment extent (msb) */
|
|
u_int64_t sd_xx0:3; /* unused */
|
|
u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/
|
|
u_int64_t sd_hibase:40 __packed;/* segment base address (msb) */
|
|
u_int64_t sd_xx1:8;
|
|
u_int64_t sd_mbz:5; /* MUST be zero */
|
|
u_int64_t sd_xx2:19;
|
|
} __packed;
|
|
|
|
/*
|
|
* Gate descriptors (e.g. indirect descriptors, trap, interrupt etc. 128 bit)
|
|
* Only interrupt and trap gates have gd_ist.
|
|
*/
|
|
struct gate_descriptor {
|
|
u_int64_t gd_looffset:16; /* gate offset (lsb) */
|
|
u_int64_t gd_selector:16; /* gate segment selector */
|
|
u_int64_t gd_ist:3; /* IST table index */
|
|
u_int64_t gd_xx:5; /* unused */
|
|
u_int64_t gd_type:5; /* segment type */
|
|
u_int64_t gd_dpl:2; /* segment descriptor priority level */
|
|
u_int64_t gd_p:1; /* segment descriptor present */
|
|
u_int64_t gd_hioffset:48 __packed; /* gate offset (msb) */
|
|
u_int64_t sd_xx1:32;
|
|
} __packed;
|
|
|
|
/*
|
|
* Generic descriptor
|
|
*/
|
|
union descriptor {
|
|
struct user_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 64 bit 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_SYSTSS 9 /* system available 64 bit TSS */
|
|
#define SDT_SYSNULL3 10 /* system null again */
|
|
#define SDT_SYSBSY 11 /* system busy 64 bit TSS */
|
|
#define SDT_SYSCGT 12 /* system 64 bit call gate */
|
|
#define SDT_SYSNULL4 13 /* system null again */
|
|
#define SDT_SYSIGT 14 /* system 64 bit interrupt gate */
|
|
#define SDT_SYSTGT 15 /* system 64 bit 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 long ssd_base; /* segment base address */
|
|
unsigned long ssd_limit; /* segment extent */
|
|
unsigned long ssd_type:5; /* segment type */
|
|
unsigned long ssd_dpl:2; /* segment descriptor priority level */
|
|
unsigned long ssd_p:1; /* segment descriptor present */
|
|
unsigned long ssd_long:1; /* long mode (for %cs) */
|
|
unsigned long ssd_def32:1; /* default 32 vs 16 bit size */
|
|
unsigned long ssd_gran:1; /* limit granularity (byte/page units)*/
|
|
} __packed;
|
|
|
|
/*
|
|
* region descriptors, used to load gdt/idt tables before segments yet exist.
|
|
*/
|
|
struct region_descriptor {
|
|
unsigned long rd_limit:16; /* segment extent */
|
|
unsigned long rd_base:64 __packed; /* base address */
|
|
} __packed;
|
|
|
|
/*
|
|
* Size of IDT table
|
|
*/
|
|
#define NIDT 256 /* 32 reserved, 16 h/w, 0 s/w, linux's 0x80 */
|
|
#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_DTRACE_RET 0x20 /* DTrace pid provider Interrupt Vector */
|
|
#define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */
|
|
|
|
/*
|
|
* Entries in the Global Descriptor Table (GDT)
|
|
*/
|
|
#define GNULL_SEL 0 /* Null Descriptor */
|
|
#define GNULL2_SEL 1 /* Null Descriptor */
|
|
#define GUFS32_SEL 2 /* User 32 bit %fs Descriptor */
|
|
#define GUGS32_SEL 3 /* User 32 bit %gs Descriptor */
|
|
#define GCODE_SEL 4 /* Kernel Code Descriptor */
|
|
#define GDATA_SEL 5 /* Kernel Data Descriptor */
|
|
#define GUCODE32_SEL 6 /* User 32 bit code Descriptor */
|
|
#define GUDATA_SEL 7 /* User 32/64 bit Data Descriptor */
|
|
#define GUCODE_SEL 8 /* User 64 bit Code Descriptor */
|
|
#define GPROC0_SEL 9 /* TSS for entering kernel etc */
|
|
/* slot 10 is second half of GPROC0_SEL */
|
|
#define GUSERLDT_SEL 11 /* LDT */
|
|
/* slot 11 is second half of GUSERLDT_SEL */
|
|
#define NGDT 13
|
|
|
|
#ifdef _KERNEL
|
|
extern struct user_segment_descriptor gdt[];
|
|
extern struct soft_segment_descriptor gdt_segs[];
|
|
extern struct gate_descriptor *idt;
|
|
extern struct region_descriptor r_gdt, r_idt;
|
|
|
|
void lgdt(struct region_descriptor *rdp);
|
|
void sdtossd(struct user_segment_descriptor *sdp,
|
|
struct soft_segment_descriptor *ssdp);
|
|
void ssdtosd(struct soft_segment_descriptor *ssdp,
|
|
struct user_segment_descriptor *sdp);
|
|
void ssdtosyssd(struct soft_segment_descriptor *ssdp,
|
|
struct system_segment_descriptor *sdp);
|
|
void update_gdt_gsbase(struct thread *td, uint32_t base);
|
|
void update_gdt_fsbase(struct thread *td, uint32_t base);
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* !_MACHINE_SEGMENTS_H_ */
|