This is xnu-11215.1.10. See this file in:
/*
* 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 <mach/vm_param.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