osfmk/ppc/io_map.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_COPYRIGHT@
  32  *
  33  */
  34
  35 #include <debug.h>
  36 #include <mach/vm_param.h>
  37 #include <vm/vm_kern.h>
  38 #include <vm/vm_map.h>
  39 #include <vm/vm_page.h>
  40 #include <ppc/pmap.h>
  41 #include <ppc/io_map_entries.h>
  42 #include <ppc/Firmware.h>
  43 #include <ppc/mappings.h>
  44 #include <ppc/proc_reg.h>
  45
  46 extern vm_offset_t      virtual_avail;
  47
  48 /*
  49  * Allocate and map memory for devices that may need to be mapped
  50  * outside the usual physical memory. If phys_addr is NULL then
  51  * steal the appropriate number of physical pages from the vm
  52  * system and map them.
  53  *
  54  * Note, this will onl
  55  */
  56 vm_offset_t
  57 io_map(phys_addr, size)
  58         vm_offset_t     phys_addr;
  59         vm_size_t       size;
  60 {
  61         vm_offset_t     start;
  62         int             i;
  63         unsigned int j;
  64         vm_page_t       m;
  65
  66
  67 #if DEBUG
  68         assert (kernel_map != VM_MAP_NULL);                     /* VM must be initialised */
  69 #endif
  70
  71         if (phys_addr != 0) {                                           /* If they supplied a physical address, use it */
  72
  73                 size = round_page(size + (phys_addr & PAGE_MASK));      /* Make sure we map all of it */
  74
  75                 (void) kmem_alloc_pageable(kernel_map, &start, size);   /* Get some virtual addresses to use */
  76
  77                 (void)mapping_make(kernel_pmap, (addr64_t)start, (ppnum_t)(phys_addr >> 12),
  78                         (mmFlgBlock | mmFlgUseAttr | mmFlgCInhib | mmFlgGuarded),       /* Map as I/O page */
  79                         (size >> 12), VM_PROT_READ|VM_PROT_WRITE);
  80
  81                 return (start + (phys_addr & PAGE_MASK));       /* Pass back the physical address */
  82
  83         } else {
  84
  85                 (void) kmem_alloc_pageable(kernel_map, &start, size);   /* Get some virtual addresses */
  86
  87                 mapping_prealloc(size);                                 /* Make sure there are enough free mappings */
  88
  89                 for (i = 0; i < size ; i += PAGE_SIZE) {
  90                         m = VM_PAGE_NULL;
  91                         while ((m = vm_page_grab()) == VM_PAGE_NULL) {  /* Get a physical page */
  92                                 VM_PAGE_WAIT();                                 /* Wait if we didn't have one */
  93                         }
  94                         vm_page_gobble(m);
  95
  96                         (void)mapping_make(kernel_pmap,
  97                                 (addr64_t)(start + i), m->phys_page,
  98                                 (mmFlgBlock | mmFlgUseAttr | mmFlgCInhib | mmFlgGuarded),       /* Map as I/O page */
  99                                 1, VM_PROT_READ|VM_PROT_WRITE);
 100
 101                 }
 102
 103                 mapping_relpre();                                               /* Allow mapping release */
 104                 return start;
 105         }
 106 }
 107
 108
 109 /*
 110  * Allocate and map memory for devices before the VM system comes alive.
 111  */
 112
 113 vm_offset_t io_map_spec(vm_offset_t phys_addr, vm_size_t size)
 114 {
 115         vm_offset_t     start;
 116
 117         if(kernel_map != VM_MAP_NULL) {                         /* If VM system is up, redirect to normal routine */
 118
 119                 return io_map(phys_addr, size);                 /* Map the address */
 120
 121         }
 122
 123         size = round_page(size + (phys_addr - (phys_addr & -PAGE_SIZE)));       /* Extend the length to include it all */
 124         start = pmap_boot_map(size);                            /* Get me some virtual address */
 125
 126         (void)mapping_make(kernel_pmap, (addr64_t)start, (ppnum_t)(phys_addr >> 12),
 127                 (mmFlgBlock | mmFlgUseAttr | mmFlgCInhib | mmFlgGuarded),       /* Map as I/O page */
 128                 (size >> 12), VM_PROT_READ|VM_PROT_WRITE);
 129
 130         return (start + (phys_addr & PAGE_MASK));
 131 }