xnu-7195.101.1.tar.gz

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

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/*
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/*
 * 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
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 */

/*
 */

#ifndef _I386_MP_DESC_H_
#define _I386_MP_DESC_H_

#include <sys/cdefs.h>

__BEGIN_DECLS

/*
 * Multiprocessor i386/i486 systems use a separate copy of the
 * GDT, IDT, LDT, and kernel TSS per processor.  The first three
 * are separate to avoid lock contention: the i386 uses locked
 * memory cycles to access the descriptor tables.  The TSS is
 * separate since each processor needs its own kernel stack,
 * and since using a TSS marks it busy.
 */

#include <i386/seg.h>
#include <i386/tss.h>

/*
 * The descriptor tables are together in a structure
 * allocated one per processor (except for the boot processor).
 */
#define FSTK_SZ (PAGE_SIZE/2)
typedef struct cpu_desc_table64 {
	struct fake_descriptor  gdt[GDTSZ]       __attribute__ ((aligned(16)));
	struct x86_64_tss       ktss             __attribute__ ((aligned(16)));
	struct sysenter_stack   sstk             __attribute__ ((aligned(16)));
	uint8_t                 *fstkp;
} cpu_desc_table64_t;

typedef struct {
	uint8_t                 fstk[FSTK_SZ]  __attribute__ ((aligned(16)));
} cpu_fault_stack_t;

#define current_gdt()   (current_cpu_datap()->cpu_desc_index.cdi_gdtb.ptr)
#define current_idt()   (current_cpu_datap()->cpu_desc_index.cdi_idtb.ptr)
#define current_ldt()   (current_cpu_datap()->cpu_desc_index.cdi_ldtb)
#define current_ktss()  (current_cpu_datap()->cpu_desc_index.cdi_ktssb)
#define current_sstk()  (current_cpu_datap()->cpu_desc_index.cdi_sstkb)

#define current_ktss64() ((struct x86_64_tss *) current_ktss())
#define current_sstk64() ((addr64_t *) current_sstk())

#define gdt_desc_p(sel) \
	(&((struct real_descriptor *)current_gdt())[sel_idx(sel)])
#define ldt_desc_p(sel) \
	(&current_ldt()[sel_idx(sel)])

extern void     cpu_syscall_init(cpu_data_t *cdp);

extern void     cpu_desc_init(cpu_data_t *cdp);
extern void     cpu_desc_load(cpu_data_t *cdp);

extern boolean_t
valid_user_data_selector(uint16_t selector);

extern boolean_t
valid_user_code_selector(uint16_t selector);

extern boolean_t
valid_user_stack_selector(uint16_t selector);

extern boolean_t
valid_user_segment_selectors(uint16_t cs,
    uint16_t ss,
    uint16_t ds,
    uint16_t es,
    uint16_t fs,
    uint16_t gs);

__END_DECLS

#endif  /* _X86_64_MP_DESC_H_ */