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Annotation of XNU/osfmk/ppc/io_map.c, revision 1.1.1.1

1.1       root        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: /*
                     23:  * @OSF_COPYRIGHT@
                     24:  * 
                     25:  */
                     26: 
                     27: #include <debug.h>
                     28: #include <mach/vm_param.h>
                     29: #include <vm/vm_kern.h>
                     30: #include <vm/vm_map.h>
                     31: #include <vm/vm_page.h>
                     32: #include <ppc/pmap.h>
                     33: #include <ppc/io_map_entries.h>
                     34: #include <ppc/Firmware.h>
                     35: #include <ppc/mappings.h>
                     36: 
                     37: extern vm_offset_t     virtual_avail;
                     38: 
                     39: /*
                     40:  * Allocate and map memory for devices that may need to be mapped 
                     41:  * outside the usual physical memory. If phys_addr is NULL then
                     42:  * steal the appropriate number of physical pages from the vm
                     43:  * system and map them.
                     44:  */
                     45: vm_offset_t
                     46: io_map(phys_addr, size)
                     47:        vm_offset_t     phys_addr;
                     48:        vm_size_t       size;
                     49: {
                     50:        vm_offset_t     start;
                     51:        int             i;
                     52:        unsigned int j;
                     53:        vm_page_t       m;
                     54: 
                     55: 
                     56: #if DEBUG
                     57:        assert (kernel_map != VM_MAP_NULL);                     /* VM must be initialised */
                     58: #endif
                     59:        
                     60:        mapping_prealloc(size);                                         /* TEMPORARY - make sure there are enough free mappings */
                     61: 
                     62:        if (phys_addr != 0) {
                     63:                /* make sure we map full contents of all the pages concerned */
                     64:                size = round_page(size + (phys_addr & PAGE_MASK));
                     65: 
                     66:                /* Steal some free virtual addresses */
                     67: 
                     68:                (void) kmem_alloc_pageable(kernel_map, &start, size);
                     69:        
                     70:                (void) pmap_map_bd(start,
                     71:                                   trunc_page(phys_addr),
                     72:                                   trunc_page(phys_addr) + size,
                     73:                                   VM_PROT_READ|VM_PROT_WRITE);
                     74: 
                     75:                mapping_relpre();                                               /* TEMPORARY - Allow mapping release */
                     76:                return (start + (phys_addr & PAGE_MASK));
                     77:        
                     78:        } else {
                     79:                /* Steal some free virtual addresses */
                     80:                (void) kmem_alloc_pageable(kernel_map, &start, size);
                     81: 
                     82:                /* Steal some physical pages and map them one by one */
                     83:                for (i = 0; i < size ; i += PAGE_SIZE) {
                     84:                        m = VM_PAGE_NULL;
                     85:                        while ((m = vm_page_grab()) == VM_PAGE_NULL)
                     86:                                VM_PAGE_WAIT();
                     87:                        vm_page_gobble(m);
                     88:                        (void) pmap_map_bd(start + i,
                     89:                                           m->phys_addr,
                     90:                                           m->phys_addr + PAGE_SIZE,
                     91:                                           VM_PROT_READ|VM_PROT_WRITE);
                     92:                }
                     93: 
                     94:                mapping_relpre();                                               /* TEMPORARY - Allow mapping release */
                     95:                return start;
                     96:        }
                     97: }

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