xnu-7195.50.7.100.1.tar.gz

[apple/xnu.git] / osfmk / i386 / tss.h

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/*
 * @OSF_COPYRIGHT@
 */
/*
 * Mach Operating System
 * Copyright (c) 1991,1990,1989 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_TSS_H_
#define _I386_TSS_H_

#include <stdint.h>

/*
 *	i386 Task State Segment
 */
struct i386_tss {
	uint32_t        back_link;      /* segment number of previous task,
	                                 *  if nested */
	uint32_t        esp0;           /* initial stack pointer ... */
	uint32_t        ss0;            /* and segment for ring 0 */
	uint32_t        esp1;           /* initial stack pointer ... */
	uint32_t        ss1;            /* and segment for ring 1 */
	uint32_t        esp2;           /* initial stack pointer ... */
	uint32_t        ss2;            /* and segment for ring 2 */
	uint32_t        cr3;            /* CR3 - page table directory
	                                 *        physical address */
	uint32_t        eip;
	uint32_t        eflags;
	uint32_t        eax;
	uint32_t        ecx;
	uint32_t        edx;
	uint32_t        ebx;
	uint32_t        esp;            /* current stack pointer */
	uint32_t        ebp;
	uint32_t        esi;
	uint32_t        edi;
	uint32_t        es;
	uint32_t        cs;
	uint32_t        ss;             /* current stack segment */
	uint32_t        ds;
	uint32_t        fs;
	uint32_t        gs;
	uint32_t        ldt;            /* local descriptor table segment */
	uint16_t        trace_trap;     /* trap on switch to this task */
	uint16_t        io_bit_map_offset;
	/* offset to start of IO permission
	 *  bit map */
};

/*
 * Temporary stack used on kernel entry via the sysenter instruction.
 * Its top points on to the PCB save area. It must contain space for
 * a single interrupt stack frame in case of single-stepping over the sysenter.
 * Although this is defined as a 64-bit stack, the space is also used in
 * 32-bit legacy mode. For 64-bit the stack is 16-byte aligned.
 */

struct sysenter_stack {
	uint64_t        sysestack[64];  /* Space for a 64-bit frame and some */
	uint64_t        top;            /* Top and pointer to ISS in PCS */
};

#pragma pack(4)
struct x86_64_tss {
	uint32_t        reserved1;
	uint64_t        rsp0;           /* stack pointer for CPL0 */
	uint64_t        rsp1;           /* stack pointer for CPL1 */
	uint64_t        rsp2;           /* stack pointer for CPL2 */
	uint32_t        reserved2;
	uint32_t        reserved3;
	uint64_t        ist1;           /* interrupt stack table 1 */
	uint64_t        ist2;           /* interrupt stack table 2 */
	uint64_t        ist3;           /* interrupt stack table 3 */
	uint64_t        ist4;           /* interrupt stack table 4 */
	uint64_t        ist5;           /* interrupt stack table 5 */
	uint64_t        ist6;           /* interrupt stack table 6 */
	uint64_t        ist7;           /* interrupt stack table 7 */
	uint32_t        reserved4;
	uint32_t        reserved5;
	uint16_t        reserved6;
	uint16_t        io_bit_map_offset;
	/* offset to IO permission bit map */
};
#pragma pack()
#endif  /* _I386_TSS_H_ */