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	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* Copyright (c) 1991 NeXT Computer, Inc. All rights reserved.
	23	*
	24	* File: kern/mach_fat.c
	25	* Author: Peter King
	26	*
	27	* Fat file support routines.
	28	*
	29	*/
	30
	31	#include <sys/param.h>
	32	#include <sys/types.h>
	33	#include <sys/uio.h>
	34	#include <sys/vnode.h>
	35	#include <vm/vm_kern.h>
	36	#include <mach/kern_return.h>
	37	#include <mach/vm_param.h>
	38	#include <kern/cpu_number.h>
	39	#include <mach-o/fat.h>
	40	#include <kern/mach_loader.h>
	41	#include <architecture/byte_order.h>
	42
	43
	44	/**********************************************************************
	45	* Routine: fatfile_getarch()
	46	*
	47	* Function: Locate the architecture-dependant contents of a fat
	48	* file that match this CPU.
	49	*
	50	* Args: vp: The vnode for the fat file.
	51	* header: A pointer to the fat file header.
	52	* archret (out): Pointer to fat_arch structure to hold
	53	* the results.
	54	*
	55	* Returns: KERN_SUCCESS: Valid architecture found.
	56	* KERN_FAILURE: No valid architecture found.
	57	**********************************************************************/
	58	load_return_t
	59	fatfile_getarch(
	60	struct vnode *vp,
	61	vm_offset_t data_ptr,
	62	struct fat_arch *archret)
	63	{
	64	/* vm_pager_t pager; */
	65	vm_offset_t addr;
	66	vm_size_t size;
	67	kern_return_t kret;
	68	load_return_t lret;
	69	struct machine_slot *ms;
	70	struct fat_arch *arch;
	71	struct fat_arch *best_arch;
	72	int grade;
	73	int best_grade;
	74	int nfat_arch;
	75	int end_of_archs;
	76	struct fat_header *header;
	77	off_t filesize;
	78
	79	/*
	80	* Get the pager for the file.
	81	*/
	82
	83	header = (struct fat_header *)data_ptr;
	84
	85	/*
	86	* Map portion that must be accessible directly into
	87	* kernel's map.
	88	*/
	89	nfat_arch = NXSwapBigLongToHost(header->nfat_arch);
	90
	91	end_of_archs = sizeof(struct fat_header)
	92	+ nfat_arch * sizeof(struct fat_arch);
	93	#if 0
	94	filesize = ubc_getsize(vp);
	95	if (end_of_archs > (int)filesize) {
	96	return(LOAD_BADMACHO);
	97	}
	98	#endif
	99
	100	/* This is beacuse we are reading only 512 bytes */
	101
	102	if (end_of_archs > 512)
	103	return(LOAD_BADMACHO);
	104	/*
	105	* Round size of fat_arch structures up to page boundry.
	106	*/
	107	size = round_page(end_of_archs);
	108	if (size <= 0)
	109	return(LOAD_BADMACHO);
	110
	111	/*
	112	* Scan the fat_arch's looking for the best one.
	113	*/
	114	addr = data_ptr;
	115	ms = &machine_slot[cpu_number()];
	116	best_arch = NULL;
	117	best_grade = 0;
	118	arch = (struct fat_arch *) (addr + sizeof(struct fat_header));
	119	for (; nfat_arch-- > 0; arch++) {
	120
	121	/*
	122	* Check to see if right cpu type.
	123	*/
	124	if(NXSwapBigIntToHost(arch->cputype) != ms->cpu_type)
	125	continue;
	126
	127	/*
	128	* Get the grade of the cpu subtype.
	129	*/
	130	grade = grade_cpu_subtype(
	131	NXSwapBigIntToHost(arch->cpusubtype));
	132
	133	/*
	134	* Remember it if it's the best we've seen.
	135	*/
	136	if (grade > best_grade) {
	137	best_grade = grade;
	138	best_arch = arch;
	139	}
	140	}
	141
	142	/*
	143	* Return our results.
	144	*/
	145	if (best_arch == NULL) {
	146	lret = LOAD_BADARCH;
	147	} else {
	148	archret->cputype =
	149	NXSwapBigIntToHost(best_arch->cputype);
	150	archret->cpusubtype =
	151	NXSwapBigIntToHost(best_arch->cpusubtype);
	152	archret->offset =
	153	NXSwapBigLongToHost(best_arch->offset);
	154	archret->size =
	155	NXSwapBigLongToHost(best_arch->size);
	156	archret->align =
	157	NXSwapBigLongToHost(best_arch->align);
	158
	159	lret = LOAD_SUCCESS;
	160	}
	161
	162	/*
	163	* Free the memory we allocated and return.
	164	*/
	165	return(lret);
	166	}
	167
	168