/* * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This 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 OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_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_ #include <mach_kdb.h> #include <stdint.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 15 /* size of the kernel ldt in entries*/ #if MACH_KDB #ifdef MACH_BSD #define GDTSZ 14 #else #define GDTSZ 11 #endif #else /* MACH_KDB */ #ifdef MACH_BSD #define GDTSZ 13 #else #define GDTSZ 10 #endif #endif /* MACH_KDB */ /* * Interrupt table is always 256 entries long. */ #define IDTSZ 256 #ifndef __ASSEMBLER__ #include <sys/cdefs.h> /* * Real segment descriptor. */ struct real_descriptor { unsigned int 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_gate { unsigned int offset_low:16, /* offset 0..15 */ selector:16, word_count:8, access:8, offset_high:16; /* offset 16..31 */ }; /* * 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 { unsigned int offset:32; /* offset */ unsigned int lim_or_seg:20; /* limit */ /* or segment, for gate */ unsigned int size_or_wdct:4; /* size/granularity */ /* word count, for gate */ unsigned int access:8; /* access */ }; /* * Boot-time data for master (or only) CPU */ extern struct fake_descriptor idt[IDTSZ]; extern struct fake_descriptor gdt[GDTSZ]; extern struct fake_descriptor ldt[LDTSZ]; extern struct i386_tss ktss; __BEGIN_DECLS #if MACH_KDB extern char db_stack_store[]; extern char db_task_stack_store[]; extern struct i386_tss dbtss; extern void db_task_start(void); #endif /* MACH_KDB */ __END_DECLS #endif /*__ASSEMBLER__*/ #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 NULL_SEG 0 /* * User descriptors for MACH - 32-bit flat address space */ #define USER_SCALL 0x07 /* system call gate */ #define USER_RPC 0x0f /* mach rpc call gate */ #define USER_CS 0x17 /* user code segment */ #define USER_DS 0x1f /* user data segment */ #define USER_CTHREAD 0x27 /* user cthread area */ #define USER_SETTABLE 0x2f /* start of user settable ldt entries */ #define USLDTSZ 10 /* number of user settable entries */ /* * Kernel descriptors for MACH - 32-bit flat address space. */ #define KERNEL_CS 0x08 /* kernel code */ #define KERNEL_DS 0x10 /* kernel data */ #define KERNEL_LDT 0x18 /* master LDT */ #define KERNEL_TSS 0x20 /* master TSS (uniprocessor) */ #ifdef MACH_BSD #define BSD_SCALL_SEL 0x28 /* BSD System calls */ #define MK25_SCALL_SEL 0x30 /* MK25 System Calls */ #define MACHDEP_SCALL_SEL 0x38 /* Machdep SYstem calls */ #else #define USER_LDT 0x28 /* place for per-thread LDT */ #define USER_TSS 0x30 /* place for per-thread TSS that holds IO bitmap */ #define FPE_CS 0x38 /* floating-point emulator code */ #endif #define USER_FPREGS 0x40 /* user-mode access to saved floating-point registers */ #define CPU_DATA_GS 0x48 /* per-cpu data */ #ifdef MACH_BSD #define USER_LDT 0x58 #define USER_TSS 0x60 #define FPE_CS 0x68 #endif #if MACH_KDB #define DEBUG_TSS 0x50 /* debug TSS (uniprocessor) */ #endif #endif /* _I386_SEG_H_ */