FreeBSD/Linux Kernel Cross Reference
sys/osfmk/ppc/io_map.c

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * The contents of this file constitute Original Code as defined in and
      * are subject to the Apple Public Source License Version 1.1 (the
      * "License").  You may not use this file except in compliance with the
      * License.  Please obtain a copy of the License at
     * http://www.apple.com/publicsource and read it before using this file.
     * 
     * This Original Code and all software distributed under the License are
     * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
     * License for the specific language governing rights and limitations
     * under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*
     * @OSF_COPYRIGHT@
     * 
     */
    
    #include <debug.h>
    #include <mach/vm_param.h>
    #include <vm/vm_kern.h>
    #include <vm/vm_map.h>
    #include <vm/vm_page.h>
    #include <ppc/pmap.h>
    #include <ppc/io_map_entries.h>
    #include <ppc/Firmware.h>
    #include <ppc/mappings.h>
    #include <ppc/proc_reg.h>
    
    extern vm_offset_t      virtual_avail;
    
    /*
     * Allocate and map memory for devices that may need to be mapped 
     * outside the usual physical memory. If phys_addr is NULL then
     * steal the appropriate number of physical pages from the vm
     * system and map them.
     *
     * Note, this will onl
     */
    vm_offset_t
    io_map(phys_addr, size)
            vm_offset_t     phys_addr;
            vm_size_t       size;
    {
            vm_offset_t     start;
            int             i;
            unsigned int j;
            vm_page_t       m;
    
    
    #if DEBUG
            assert (kernel_map != VM_MAP_NULL);                     /* VM must be initialised */
    #endif
    
            if (phys_addr != 0) {                                           /* If they supplied a physical address, use it */
    
                    size = round_page(size + (phys_addr & PAGE_MASK));      /* Make sure we map all of it */
    
                    (void) kmem_alloc_pageable(kernel_map, &start, size);   /* Get some virtual addresses to use */
                    
                    (void)mapping_make(kernel_pmap, (addr64_t)start, (ppnum_t)(phys_addr >> 12), 
                            (mmFlgBlock | mmFlgUseAttr | mmFlgCInhib | mmFlgGuarded),       /* Map as I/O page */
                            (size >> 12), VM_PROT_READ|VM_PROT_WRITE);
    
                    return (start + (phys_addr & PAGE_MASK));       /* Pass back the physical address */
            
            } else {
            
                    (void) kmem_alloc_pageable(kernel_map, &start, size);   /* Get some virtual addresses */
    
                    mapping_prealloc(size);                                 /* Make sure there are enough free mappings */
    
                    for (i = 0; i < size ; i += PAGE_SIZE) {
                            m = VM_PAGE_NULL;
                            while ((m = vm_page_grab()) == VM_PAGE_NULL) {  /* Get a physical page */
                                    VM_PAGE_WAIT();                                 /* Wait if we didn't have one */
                            }
                            vm_page_gobble(m);
                            
                            (void)mapping_make(kernel_pmap, 
                                    (addr64_t)(start + i), m->phys_page, 
                                    (mmFlgBlock | mmFlgUseAttr | mmFlgCInhib | mmFlgGuarded),       /* Map as I/O page */
                                    1, VM_PROT_READ|VM_PROT_WRITE); 
                            
                    }
    
                    mapping_relpre();                                               /* Allow mapping release */
                    return start;
            }
    }
    
   
   /*
    * Allocate and map memory for devices before the VM system comes alive.
    */
   
   vm_offset_t io_map_spec(vm_offset_t phys_addr, vm_size_t size)
   {
           vm_offset_t     start;
   
           if(kernel_map != VM_MAP_NULL) {                         /* If VM system is up, redirect to normal routine */
                   
                   return io_map(phys_addr, size);                 /* Map the address */
           
           }
           
           size = round_page(size + (phys_addr - (phys_addr & -PAGE_SIZE)));       /* Extend the length to include it all */
           start = pmap_boot_map(size);                            /* Get me some virtual address */
   
           (void)mapping_make(kernel_pmap, (addr64_t)start, (ppnum_t)(phys_addr >> 12), 
                   (mmFlgBlock | mmFlgUseAttr | mmFlgCInhib | mmFlgGuarded),       /* Map as I/O page */
                   (size >> 12), VM_PROT_READ|VM_PROT_WRITE);
   
           return (start + (phys_addr & PAGE_MASK));
   }

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