xnu-4903.241.1.tar.gz

[apple/xnu.git] / bsd / dev / i386 / kern_machdep.c

/*
 * Copyright (c) 2000-2013 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,
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 * 
 * 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
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 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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/*
 *	Copyright (C) 1990,  NeXT, Inc.
 *
 *	File:	next/kern_machdep.c
 *	Author:	John Seamons
 *
 *	Machine-specific kernel routines.
 */

#include	<sys/types.h>
#include	<mach/machine.h>
#include	<kern/cpu_number.h>
#include	<machine/exec.h>
#include	<machine/machine_routines.h>

/**********************************************************************
 * Routine:	grade_binary()
 *
 * Function:	Say OK to CPU types that we can actually execute on the given
 *		system. 64-bit binaries have the highest preference, followed
 *		by 32-bit binaries. 0 means unsupported.
 **********************************************************************/
int
grade_binary(cpu_type_t exectype, cpu_subtype_t execsubtype)
{
	cpu_subtype_t hostsubtype = cpu_subtype();

	switch(exectype) {
	case CPU_TYPE_X86_64:		/* native 64-bit */
		switch(hostsubtype) {
		case CPU_SUBTYPE_X86_64_H:	/* x86_64h can execute anything */
			switch (execsubtype) {
			case CPU_SUBTYPE_X86_64_H:
				return 3;
			case CPU_SUBTYPE_X86_64_ALL:
				return 2;
			}
			break;
		case CPU_SUBTYPE_X86_ARCH1:	/* generic systems can only execute ALL subtype */
			switch (execsubtype) {
			case CPU_SUBTYPE_X86_64_ALL:
				return 2;
			}
			break;
		}
		break;
	case CPU_TYPE_X86:		/* native */
		return 1;
	}

	return 0;
}

boolean_t
pie_required(cpu_type_t exectype __unused, cpu_subtype_t execsubtype __unused)
{
	return FALSE;
}