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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 proc p = current_proc(); / XXXX */
	77	struct fat_header *header;
	78	off_t filesize;
	79
	80	/*
	81	* Get the pager for the file.
	82	*/
	83
	84	header = (struct fat_header *)data_ptr;
	85
	86	/*
	87	* Map portion that must be accessible directly into
	88	* kernel's map.
	89	*/
	90	nfat_arch = NXSwapBigLongToHost(header->nfat_arch);
	91
	92	end_of_archs = sizeof(struct fat_header)
	93	+ nfat_arch * sizeof(struct fat_arch);
	94	#if 0
	95	filesize = ubc_getsize(vp);
	96	if (end_of_archs > (int)filesize)
	97	return(LOAD_BADMACHO);
	98	}
	99	#endif
	100
	101	/* This is beacuse we are reading only 512 bytes */
	102
	103	if (end_of_archs > 512)
	104	return(LOAD_BADMACHO);
	105	/*
	106	* Round size of fat_arch structures up to page boundry.
	107	*/
	108	size = round_page(end_of_archs);
	109	if (size <= 0)
	110	return(LOAD_BADMACHO);
	111
	112	/*
	113	* Scan the fat_arch's looking for the best one.
	114	*/
	115	addr = data_ptr;
	116	ms = &machine_slot[cpu_number()];
	117	best_arch = NULL;
	118	best_grade = 0;
	119	arch = (struct fat_arch *) (addr + sizeof(struct fat_header));
	120	for (; nfat_arch-- > 0; arch++) {
	121
	122	/*
	123	* Check to see if right cpu type.
	124	*/
	125	if(NXSwapBigIntToHost(arch->cputype) != ms->cpu_type)
	126	continue;
	127
	128	/*
	129	* Get the grade of the cpu subtype.
	130	*/
	131	grade = grade_cpu_subtype(
	132	NXSwapBigIntToHost(arch->cpusubtype));
	133
	134	/*
	135	* Remember it if it's the best we've seen.
	136	*/
	137	if (grade > best_grade) {
	138	best_grade = grade;
	139	best_arch = arch;
	140	}
	141	}
	142
	143	/*
	144	* Return our results.
	145	*/
	146	if (best_arch == NULL) {
	147	lret = LOAD_BADARCH;
	148	} else {
	149	archret->cputype =
	150	NXSwapBigIntToHost(best_arch->cputype);
	151	archret->cpusubtype =
	152	NXSwapBigIntToHost(best_arch->cpusubtype);
	153	archret->offset =
	154	NXSwapBigLongToHost(best_arch->offset);
	155	archret->size =
	156	NXSwapBigLongToHost(best_arch->size);
	157	archret->align =
	158	NXSwapBigLongToHost(best_arch->align);
	159
	160	lret = LOAD_SUCCESS;
	161	}
	162
	163	/*
	164	* Free the memory we allocated and return.
	165	*/
	166	return(lret);
	167	}
	168
	169