/* * Copyright (c) 2000-2012 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ */ /* * Mach Operating System * Copyright (c) 1991,1990 Carnegie Mellon University * All Rights Reserved. * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation. * * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. * * Carnegie Mellon requests users of this software to return to * * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU * School of Computer Science * Carnegie Mellon University * Pittsburgh PA 15213-3890 * * any improvements or extensions that they make and grant Carnegie Mellon * the rights to redistribute these changes. */ #ifndef _I386_SEG_H_ #define _I386_SEG_H_ #ifndef __ASSEMBLER__ #include <stdint.h> #include <mach/vm_types.h> #include <architecture/i386/sel.h> /* * i386 segmentation. */ static inline uint16_t sel_to_selector(sel_t sel) { union { sel_t sel; uint16_t selector; } tconv; tconv.sel = sel; return tconv.selector; } static inline sel_t selector_to_sel(uint16_t selector) { union { uint16_t selector; sel_t sel; } tconv; tconv.selector = selector; return tconv.sel; } #define LDTSZ_MAX 8192 /* maximal size of the kernel ldt in entries */ #define LDTSZ_DFL (128) #define LDTSZ (LDTSZ_MAX) #define LDTSZ_MIN SEL_TO_INDEX(USER_SETTABLE) /* kernel ldt entries */ #define GDTSZ 19 /* * Interrupt table is always 256 entries long. */ #define IDTSZ 256 #include <sys/cdefs.h> /* * Real segment descriptor. */ struct real_descriptor { uint32_t limit_low:16, /* limit 0..15 */ base_low:16, /* base 0..15 */ base_med:8, /* base 16..23 */ access:8, /* access byte */ limit_high:4, /* limit 16..19 */ granularity:4, /* granularity */ base_high:8; /* base 24..31 */ }; struct real_descriptor64 { uint32_t limit_low16:16, /* limit 0..15 */ base_low16:16, /* base 0..15 */ base_med8:8, /* base 16..23 */ access8:8, /* access byte */ limit_high4:4, /* limit 16..19 */ granularity4:4, /* granularity */ base_high8:8, /* base 24..31 */ base_top32:32, /* base 32..63 */ reserved32:32; /* reserved/zero */ }; struct real_gate { uint32_t offset_low:16, /* offset 0..15 */ selector:16, word_count:8, access:8, offset_high:16; /* offset 16..31 */ }; struct real_gate64 { uint32_t offset_low16:16, /* offset 0..15 */ selector16:16, IST:3, zeroes5:5, access8:8, offset_high16:16, /* offset 16..31 */ offset_top32:32, /* offset 32..63 */ reserved32:32; /* reserved/zero */ }; #define MAKE_REAL_DESCRIPTOR(base, lim, gran, acc) {\ .limit_low = lim & 0xffff, \ .limit_high = (lim >> 16) & 0xf, \ .base_low = base & 0xffff, \ .base_med = (base >> 16) & 0xff, \ .base_high = (base >> 24) & 0xff, \ .access = acc, \ .granularity = gran \ } /* * We build descriptors and gates in a 'fake' format to let the * fields be contiguous. We shuffle them into the real format * at runtime. */ struct fake_descriptor { uint32_t offset:32; /* offset */ uint32_t lim_or_seg:20; /* limit */ /* or segment, for gate */ uint32_t size_or_wdct:4; /* size/granularity */ /* word count, for gate */ uint32_t access:8; /* access */ }; struct fake_descriptor64 { uint64_t offset64; /* offset [0..31,32..63] */ uint32_t lim_or_seg:20; /* limit */ /* or segment, for gate */ uint32_t size_or_IST:4; /* size/granularity */ /* IST for gates */ uint32_t access:8; /* access */ uint32_t reserved:32; /* reserved/zero */ }; typedef struct __attribute__((packed)) { uint16_t size; void *ptr; } x86_64_desc_register_t; /* * Boot-time data for master (or only) CPU */ extern struct real_descriptor master_gdt[GDTSZ]; extern struct real_descriptor master_ldt[]; extern struct i386_tss master_ktss; extern struct sysenter_stack master_sstk; extern struct fake_descriptor64 master_idt64[IDTSZ]; extern struct x86_64_tss master_ktss64; __BEGIN_DECLS extern char df_task_stack[]; extern char df_task_stack_end[]; extern struct i386_tss master_dftss; extern void df_task_start(void); extern char mc_task_stack[]; extern char mc_task_stack_end[]; extern struct i386_tss master_mctss; extern void mc_task_start(void); __END_DECLS #endif /*__ASSEMBLER__*/ #define SZ_64 0x2 /* 64-bit segment */ #define SZ_32 0x4 /* 32-bit segment */ #define SZ_G 0x8 /* 4K limit field */ #define ACC_A 0x01 /* accessed */ #define ACC_TYPE 0x1e /* type field: */ #define ACC_TYPE_SYSTEM 0x00 /* system descriptors: */ #define ACC_LDT 0x02 /* LDT */ #define ACC_CALL_GATE_16 0x04 /* 16-bit call gate */ #define ACC_TASK_GATE 0x05 /* task gate */ #define ACC_TSS 0x09 /* task segment */ #define ACC_CALL_GATE 0x0c /* call gate */ #define ACC_INTR_GATE 0x0e /* interrupt gate */ #define ACC_TRAP_GATE 0x0f /* trap gate */ #define ACC_TSS_BUSY 0x02 /* task busy */ #define ACC_TYPE_USER 0x10 /* user descriptors */ #define ACC_DATA 0x10 /* data */ #define ACC_DATA_W 0x12 /* data, writable */ #define ACC_DATA_E 0x14 /* data, expand-down */ #define ACC_DATA_EW 0x16 /* data, expand-down, * writable */ #define ACC_CODE 0x18 /* code */ #define ACC_CODE_R 0x1a /* code, readable */ #define ACC_CODE_C 0x1c /* code, conforming */ #define ACC_CODE_CR 0x1e /* code, conforming, * readable */ #define ACC_PL 0x60 /* access rights: */ #define ACC_PL_K 0x00 /* kernel access only */ #define ACC_PL_U 0x60 /* user access */ #define ACC_P 0x80 /* segment present */ /* * Components of a selector */ #define SEL_LDTS 0x04 /* local selector */ #define SEL_PL 0x03 /* privilege level: */ #define SEL_PL_K 0x00 /* kernel selector */ #define SEL_PL_U 0x03 /* user selector */ /* * Convert selector to descriptor table index. */ #define sel_idx(sel) (selector_to_sel(sel).index) #define SEL_TO_INDEX(s) ((s)>>3) #define NULL_SEG 0 /* * Kernel descriptors for MACH - 64-bit flat address space. */ #define KERNEL64_CS 0x08 /* 1: K64 code */ #define SYSENTER_CS 0x0b /* U32 sysenter pseudo-segment */ #define KERNEL64_SS 0x10 /* 2: KERNEL64_CS+8 for syscall */ #define USER_CS 0x1b /* 3: U32 code */ #define USER_DS 0x23 /* 4: USER_CS+8 for sysret */ #define USER64_CS 0x2b /* 5: USER_CS+16 for sysret */ #define USER64_DS USER_DS /* U64 data pseudo-segment */ #define KERNEL_LDT 0x30 /* 6: */ /* 7: other 8 bytes of KERNEL_LDT */ #define KERNEL_TSS 0x40 /* 8: */ /* 9: other 8 bytes of KERNEL_TSS */ #define KERNEL32_CS 0x50 /* 10: */ #define USER_LDT 0x58 /* 11: */ /* 12: other 8 bytes of USER_LDT */ #define KERNEL_DS 0x68 /* 13: 32-bit kernel data */ #define SYSENTER_TF_CS (USER_CS|0x10000) #define SYSENTER_DS KERNEL64_SS /* sysenter kernel data segment */ #endif /* _I386_SEG_H_ */ #ifdef __x86_64__ /* * 64-bit kernel LDT descriptors */ #define SYSCALL_CS 0x07 /* syscall pseudo-segment */ #define USER_CTHREAD 0x0f /* user cthread area */ #define USER_SETTABLE 0x1f /* start of user settable ldt entries */ #endif