| /*- |
| * 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 _BSD_MACHINE_SEGMENTS_H_ |
| #define _BSD_MACHINE_SEGMENTS_H_ |
| |
| /* |
| * 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 */ |
| #ifdef XEN |
| #define SEL_KPL 1 /* kernel priority level */ |
| #else |
| #define SEL_KPL 0 /* kernel priority level */ |
| #endif |
| #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 __packed; /* 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 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 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 { |
| unsigned rd_limit:16; /* segment extent */ |
| unsigned rd_base:32 __packed; /* 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 /* 32 reserved, 0x80 syscall, most are h/w */ |
| #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_SYSCALL 0x80 /* System Call Interrupt Vector */ |
| |
| /* |
| * Entries in the Global Descriptor Table (GDT) |
| * Note that each 4 entries share a single 32 byte L1 cache line. |
| * Some of the fast syscall instructions require a specific order here. |
| */ |
| #define GNULL_SEL 0 /* Null Descriptor */ |
| #define GPRIV_SEL 1 /* SMP Per-Processor Private Data */ |
| #define GUFS_SEL 2 /* User %fs Descriptor (order critical: 1) */ |
| #define GUGS_SEL 3 /* User %gs Descriptor (order critical: 2) */ |
| #define GCODE_SEL 4 /* Kernel Code Descriptor (order critical: 1) */ |
| #define GDATA_SEL 5 /* Kernel Data Descriptor (order critical: 2) */ |
| #define GUCODE_SEL 6 /* User Code Descriptor (order critical: 3) */ |
| #define GUDATA_SEL 7 /* User Data Descriptor (order critical: 4) */ |
| #define GBIOSLOWMEM_SEL 8 /* BIOS low memory access (must be entry 8) */ |
| #define GPROC0_SEL 9 /* Task state process slot zero and up */ |
| #define GLDT_SEL 10 /* Default User LDT */ |
| #define GUSERLDT_SEL 11 /* User LDT */ |
| #define GPANIC_SEL 12 /* Task state to consider panic from */ |
| #define GBIOSCODE32_SEL 13 /* BIOS interface (32bit Code) */ |
| #define GBIOSCODE16_SEL 14 /* BIOS interface (16bit Code) */ |
| #define GBIOSDATA_SEL 15 /* BIOS interface (Data) */ |
| #define GBIOSUTIL_SEL 16 /* BIOS interface (Utility) */ |
| #define GBIOSARGS_SEL 17 /* BIOS interface (Arguments) */ |
| #define GNDIS_SEL 18 /* For the NDIS layer */ |
| |
| #ifdef XEN |
| #define NGDT 9 |
| #else |
| #define NGDT 19 |
| #endif |
| |
| /* |
| * Entries in the Local Descriptor Table (LDT) |
| */ |
| #define LSYS5CALLS_SEL 0 /* forced by intel BCS */ |
| #define LSYS5SIGR_SEL 1 |
| #define L43BSDCALLS_SEL 2 /* notyet */ |
| #define LUCODE_SEL 3 |
| #define LSOL26CALLS_SEL 4 /* Solaris >= 2.6 system call gate */ |
| #define LUDATA_SEL 5 |
| /* separate stack, es,fs,gs sels ? */ |
| /* #define LPOSIXCALLS_SEL 5*/ /* notyet */ |
| #define LBSDICALLS_SEL 16 /* BSDI system call gate */ |
| #define NLDT (LBSDICALLS_SEL + 1) |
| |
| #ifdef _FREEBSD_KERNEL |
| extern int _default_ldt; |
| #ifdef XEN |
| extern union descriptor *gdt; |
| extern union descriptor *ldt; |
| #else |
| extern union descriptor gdt[]; |
| extern union descriptor ldt[NLDT]; |
| #endif |
| 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 segment_descriptor *sdp, |
| struct soft_segment_descriptor *ssdp); |
| void ssdtosd(struct soft_segment_descriptor *ssdp, |
| struct segment_descriptor *sdp); |
| #endif /* _FREEBSD_KERNEL */ |
| |
| #endif /* !_BSD_MACHINE_SEGMENTS_H_ */ |
