osfmk/ppc/io_map.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  *
  28  */
  29
  30 #include <debug.h>
  31 #include <mach/vm_param.h>
  32 #include <vm/vm_kern.h>
  33 #include <vm/vm_map.h>
  34 #include <vm/vm_page.h>
  35 #include <ppc/pmap.h>
  36 #include <ppc/io_map_entries.h>
  37 #include <ppc/Firmware.h>
  38 #include <ppc/mappings.h>
  39 #include <ppc/proc_reg.h>
  40
  41 extern vm_offset_t      virtual_avail;
  42
  43 /*
  44  * Allocate and map memory for devices that may need to be mapped
  45  * outside the usual physical memory. If phys_addr is NULL then
  46  * steal the appropriate number of physical pages from the vm
  47  * system and map them.
  48  *
  49  * Note, this will onl
  50  */
  51 vm_offset_t
  52 io_map(phys_addr, size)
  53         vm_offset_t     phys_addr;
  54         vm_size_t       size;
  55 {
  56         vm_offset_t     start;
  57         int             i;
  58         unsigned int j;
  59         vm_page_t       m;
  60
  61
  62 #if DEBUG
  63         assert (kernel_map != VM_MAP_NULL);                     /* VM must be initialised */
  64 #endif
  65
  66         if (phys_addr != 0) {                                           /* If they supplied a physical address, use it */
  67
  68                 size = round_page_32(size + (phys_addr & PAGE_MASK));   /* Make sure we map all of it */
  69
  70                 (void) kmem_alloc_pageable(kernel_map, &start, size);   /* Get some virtual addresses to use */
  71
  72                 (void)mapping_make(kernel_pmap, (addr64_t)start, (ppnum_t)(phys_addr >> 12),
  73                         (mmFlgBlock | mmFlgUseAttr | mmFlgCInhib | mmFlgGuarded),       /* Map as I/O page */
  74                         size >> 12, VM_PROT_READ|VM_PROT_WRITE);
  75
  76                 return (start + (phys_addr & PAGE_MASK));       /* Pass back the physical address */
  77
  78         } else {
  79
  80                 (void) kmem_alloc_pageable(kernel_map, &start, size);   /* Get some virtual addresses */
  81
  82                 mapping_prealloc(size);                                 /* Make sure there are enough free mappings */
  83
  84                 for (i = 0; i < size ; i += PAGE_SIZE) {
  85                         m = VM_PAGE_NULL;
  86                         while ((m = vm_page_grab()) == VM_PAGE_NULL) {  /* Get a physical page */
  87                                 VM_PAGE_WAIT();                                 /* Wait if we didn't have one */
  88                         }
  89                         vm_page_gobble(m);
  90
  91                         (void)mapping_make(kernel_pmap,
  92                                 (addr64_t)(start + i), m->phys_page,
  93                                 (mmFlgBlock | mmFlgUseAttr | mmFlgCInhib | mmFlgGuarded),       /* Map as I/O page */
  94                                 1, VM_PROT_READ|VM_PROT_WRITE);
  95
  96                 }
  97
  98                 mapping_relpre();                                               /* Allow mapping release */
  99                 return start;
 100         }
 101 }
 102
 103
 104 /*
 105  * Allocate and map memory for devices before the VM system comes alive.
 106  */
 107
 108 vm_offset_t io_map_spec(vm_offset_t phys_addr, vm_size_t size)
 109 {
 110         vm_offset_t     start;
 111         int             i;
 112         unsigned int j;
 113         vm_page_t       m;
 114
 115
 116         if(kernel_map != VM_MAP_NULL) {                         /* If VM system is up, redirect to normal routine */
 117
 118                 return io_map(phys_addr, size);                 /* Map the address */
 119
 120         }
 121
 122         size = round_page_32(size + (phys_addr - (phys_addr & -PAGE_SIZE)));    /* Extend the length to include it all */
 123         start = pmap_boot_map(size);                            /* Get me some virtual address */
 124
 125         (void)mapping_make(kernel_pmap, (addr64_t)start, (ppnum_t)(phys_addr >> 12),
 126                 (mmFlgBlock | mmFlgUseAttr | mmFlgCInhib | mmFlgGuarded),       /* Map as I/O page */
 127                 size >> 12, VM_PROT_READ|VM_PROT_WRITE);
 128
 129         return (start + (phys_addr & PAGE_MASK));
 130 }