| /*- |
| * 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_ |
| |
| /* |
| * 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; |
| |
| /* |
| * 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_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 _FREEBSD_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 /* _FREEBSD_KERNEL */ |
| |
| #endif /* !_BSD_MACHINE_SEGMENTS_H_ */ |
