/*- * Copyright (c) 1989, 1990 William F. Jolitz * Copyright (c) 1990 The Regents of the University of California. * Copyright (c) 2008 The DragonFly Project. * 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. * 3. 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: src/sys/i386/include/segments.h,v 1.24 1999/12/29 04:33:07 peter Exp $ */ #ifndef _CPU_SEGMENTS_H_ #define _CPU_SEGMENTS_H_ #ifndef LOCORE #include <sys/tls.h> #endif /* * x86_64 Segmentation Data Structures and definitions */ /* * Selectors */ #define SEL_RPL_MASK 3 /* requester's privilege level mask */ #define ISPL(s) ((s) & SEL_RPL_MASK) /* privilege level of a selector */ #define SEL_KPL 0 /* kernel privilege level */ #define SEL_UPL 3 /* user privilege level */ #define SEL_LDT 4 /* local descriptor table */ #define ISLDT(s) ((s) & SEL_LDT) /* is it local or global */ #define IDXSEL(s) (((s) >> 3) & 0x1fff) /* index of selector */ #define LSEL(s,r) (((s) << 3) | r | SEL_LDT) /* a local selector */ #define GSEL(s,r) (((s) << 3) | r) /* a global selector */ #ifndef LOCORE /* * User segment descriptors (%cs, %ds etc for compatibility 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 gd_xx1:32; } __packed; #endif /* !LOCORE */ /* 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 64-bit TSS available */ #define SDT_SYSNULL3 10 /* system null again */ #define SDT_SYSBSY 11 /* system 64-bit TSS busy */ #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 */ #ifndef LOCORE struct savetls { struct tls_info info[2]; }; /* * Software definitions are in this convenient format, * which are translated into inconvenient segment descriptors * when needed to be used by the x86 hardware. */ struct soft_segment_descriptor { uint64_t ssd_base; /* segment base address */ uint64_t ssd_limit; /* segment extent */ uint64_t ssd_type:5; /* segment type */ uint64_t ssd_dpl:2; /* segment descriptor priority level */ uint64_t ssd_p:1; /* segment descriptor present */ uint64_t ssd_long:1; /* long mode (for %cs) */ uint64_t ssd_def32:1; /* default 32 vs 16 bit size */ uint64_t ssd_gran:1; /* limit granularity (byte/page units)*/ } __packed; /* * region descriptors, used to load gdt/idt tables before segments yet exist. */ struct region_descriptor { uint64_t rd_limit:16; /* segment extent */ uint64_t rd_base:64 __packed; /* base address */ } __packed; #endif /* !LOCORE */ /* * 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 the IDT table. */ #define NIDT 256 /* we use them all */ /* * 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 1: Due to quirks in Intel's VMX implementation, the GDT * limit is set to 0xFFFF (representing 65536 bytes) on * VM exit. Rather then have to do a heavy-weight reload, * we just maximally-size the table. */ #define GNULL_SEL 0 /* Null Descriptor */ #define GCODE_SEL 1 /* Kernel Code Descriptor */ #define GDATA_SEL 2 /* Kernel Data Descriptor */ #define GUCODE32_SEL 3 /* User 32 bit Code Descriptor */ #define GUDATA_SEL 4 /* User 32/64 bit Data Descriptor */ #define GUCODE_SEL 5 /* User 64 bit Code Descriptor */ #define GPROC0_SEL 6 /* TSS for entering kernel etc */ /* slot 7 is second half of GPROC0_SEL */ #define GUGS32_SEL 8 /* User 32 bit GS Descriptor */ #define NGDT 9 #define MAXGDT_LIMIT 65536 /* (see note 1 above) */ #define MAXGDT_COUNT (MAXGDT_LIMIT / sizeof(struct user_segment_descriptor)) #ifndef LOCORE #ifdef _KERNEL extern struct soft_segment_descriptor gdt_segs[]; extern struct gate_descriptor idt_arr[MAXCPU][NIDT]; extern struct region_descriptor r_idt_arr[]; extern struct region_descriptor r_gdt; extern struct user_segment_descriptor gdt_cpu0[MAXGDT_COUNT]; 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); #endif /* _KERNEL */ #endif /* !LOCORE */ #endif /* !_CPU_SEGMENTS_H_ */
