osfmk/ppc/io_map.c

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