The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/norma/xmm_copy.c

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie the
   24  * rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        xmm_copy.c,v $
   29  * Revision 2.4  92/03/10  16:28:57  jsb
   30  *      Merged in norma branch changes as of NORMA_MK7.
   31  *      [92/03/09  12:51:05  jsb]
   32  * 
   33  * Revision 2.3.3.3  92/02/21  11:25:37  jsb
   34  *      Deallocate memory_object and memory_object_name ports.
   35  *      [92/02/20  10:56:16  jsb]
   36  * 
   37  *      Use newer xmm_decl macro with explicit name parameter.
   38  *      [92/02/16  14:06:22  jsb]
   39  * 
   40  *      Eliminated shadow obj creation, since we now let the vm system
   41  *      handle copies for us.
   42  *      [92/02/11  11:07:52  jsb]
   43  * 
   44  *      Separate xmm_copy_create from norma_copy_create.
   45  *      Replaced *_internal_memory_object garbage with call to
   46  *      xmm_memory_manager_export. Use new MEMORY_OBJECT_COPY_TEMPORARY
   47  *      strategy instead of MEMORY_OBJECT_COPY_DELAY, since we don't
   48  *      need (or want) to see changes made to our object.
   49  *      [92/02/11  11:05:04  jsb]
   50  * 
   51  *      Use new xmm_decl, and new memory_object_name and deallocation protocol.
   52  *      Removed *_internal_memory_object routines. Removed bogus data_write
   53  *      implementation. Added shadow layer creation.
   54  *      [92/02/09  12:49:43  jsb]
   55  * 
   56  *      Obtain reference to map upon creation; release on termination.
   57  *      [92/01/22  10:35:58  jsb]
   58  * 
   59  * Revision 2.3.3.1  92/01/21  21:53:50  jsb
   60  *      De-linted. Supports new (dlb) memory object routines.
   61  *      Supports arbitrary reply ports to lock_request, etc.
   62  *      Converted mach_port_t (and port_t) to ipc_port_t.
   63  *      [92/01/20  17:19:14  jsb]
   64  * 
   65  *      Fixes from OSF.
   66  *      [92/01/17  14:13:56  jsb]
   67  * 
   68  * Revision 2.3.1.1  92/01/15  12:13:44  jeffreyh
   69  *      Deallocate memory object name port on termination. (dlb)
   70  * 
   71  * Revision 2.3  91/11/15  14:09:53  rpd
   72  *      Use ipc_port_make_send in norma_copy_create for returned memory_object.
   73  *      [91/09/23  09:09:25  jsb]
   74  * 
   75  * Revision 2.2  91/08/28  11:16:22  jsb
   76  *      In m_copy_data_request: removed dead code, and added missing
   77  *      is_continuation parameter to vm_map_copyin_page_list.
   78  *      [91/08/16  14:25:04  jsb]
   79  * 
   80  *      First checkin.
   81  *      [91/08/15  13:03:06  jsb]
   82  * 
   83  */
   84 /*
   85  *      File:   norma/xmm_copy.c
   86  *      Author: Joseph S. Barrera III
   87  *      Date:   1991
   88  */
   89 
   90 #include <norma/xmm_obj.h>
   91 #include <norma/xmm_user_rename.h>
   92 #include <ipc/ipc_space.h>
   93 #include <ipc/ipc_port.h>
   94 #include <vm/memory_object.h>
   95 #include <vm/vm_fault.h>
   96 #include <vm/vm_map.h>
   97 #include <vm/vm_object.h>
   98 #include <vm/vm_page.h>
   99 #include <vm/vm_pageout.h>
  100 
  101 struct mobj {
  102         struct xmm_obj  obj;
  103         vm_map_t        map;
  104         vm_offset_t     start;
  105         vm_size_t       size;
  106         ipc_port_t      memory_object_name;
  107         ipc_port_t      memory_object;
  108 };
  109 
  110 #undef  KOBJ
  111 #define KOBJ    ((struct mobj *) kobj)
  112 
  113 #define m_copy_copy                     m_invalid_copy
  114 #define m_copy_data_unlock              m_invalid_data_unlock
  115 #define m_copy_data_write               m_invalid_data_write
  116 #define m_copy_lock_completed           m_invalid_lock_completed
  117 #define m_copy_supply_completed         m_invalid_supply_completed
  118 #define m_copy_data_return              m_invalid_data_return
  119 #define m_copy_change_completed         m_invalid_change_completed
  120 
  121 #define k_copy_data_unavailable         k_invalid_data_unavailable
  122 #define k_copy_get_attributes           k_invalid_get_attributes
  123 #define k_copy_lock_request             k_invalid_lock_request
  124 #define k_copy_data_error               k_invalid_data_error
  125 #define k_copy_set_ready                k_invalid_set_ready
  126 #define k_copy_destroy                  k_invalid_destroy
  127 #define k_copy_data_supply              k_invalid_data_supply
  128 
  129 xmm_decl(copy, "copy", sizeof(struct mobj));
  130 
  131 kern_return_t
  132 xmm_copy_create(map, start, size, new_mobj)
  133         vm_map_t map;
  134         vm_offset_t start;
  135         vm_size_t size;
  136         xmm_obj_t *new_mobj;
  137 {
  138         xmm_obj_t mobj;
  139         kern_return_t kr;
  140 
  141         assert(page_aligned(start));
  142         assert(page_aligned(size));
  143         kr = xmm_obj_allocate(&copy_class, XMM_OBJ_NULL, &mobj);
  144         if (kr != KERN_SUCCESS) {
  145                 return kr;
  146         }
  147         vm_map_reference(map);
  148         MOBJ->map = map;
  149         MOBJ->start = start;
  150         MOBJ->size = size;
  151         MOBJ->memory_object_name = ipc_port_alloc_kernel();
  152         if (MOBJ->memory_object_name == IP_NULL) {
  153                 panic("add_internal_memory_object: ipc_port_alloc_kernel");
  154         }
  155         MOBJ->memory_object = IP_NULL;
  156         *new_mobj = mobj;
  157         return KERN_SUCCESS;
  158 }
  159 
  160 norma_copy_create(map, start, size, memory_object_p)
  161         vm_map_t map;
  162         vm_offset_t start;
  163         vm_size_t size;
  164         ipc_port_t *memory_object_p;
  165 {
  166         xmm_obj_t mobj;
  167         kern_return_t kr;
  168         ipc_port_t xmm_memory_manager_export();
  169 
  170         /*
  171          * Create a read-only, xmm-internal memory manager for map.
  172          */
  173         kr = xmm_copy_create(map, start, size, &mobj);
  174         if (kr != KERN_SUCCESS) {
  175                 return kr;
  176         }
  177 
  178         /*
  179          * Create an svm stack and an xmm object, and save memory object.
  180          */
  181         MOBJ->memory_object = xmm_memory_manager_export(mobj);
  182 
  183         /*
  184          * Return memory object.
  185          */
  186         *memory_object_p = MOBJ->memory_object;
  187         return KERN_SUCCESS;
  188 }
  189 
  190 m_copy_init(mobj, k_kobj, pagesize, internal, size)
  191         xmm_obj_t mobj;
  192         xmm_obj_t k_kobj;
  193         vm_size_t pagesize;
  194         boolean_t internal;
  195         vm_size_t size;
  196 {
  197         xmm_obj_t kobj = mobj;
  198 
  199 #ifdef  lint
  200         M_INIT(mobj, k_kobj, pagesize, internal, size);
  201 #endif  lint
  202         xmm_kobj_link(kobj, k_kobj);
  203         return K_SET_READY(kobj, OBJECT_READY_TRUE, MAY_CACHE_FALSE,
  204                            MEMORY_OBJECT_COPY_TEMPORARY, USE_OLD_PAGEOUT_TRUE,
  205                            ipc_port_make_send(MOBJ->memory_object_name),
  206                            XMM_REPLY_NULL);
  207 }
  208 
  209 m_copy_terminate(mobj, kobj)
  210         xmm_obj_t mobj;
  211         xmm_obj_t kobj;
  212 {
  213         return KERN_SUCCESS;
  214 }
  215 
  216 void
  217 m_copy_deallocate(mobj)
  218         xmm_obj_t mobj;
  219 {
  220         vm_map_deallocate(MOBJ->map);
  221         ipc_port_dealloc_kernel(MOBJ->memory_object_name);
  222         if (MOBJ->memory_object != IP_NULL) {
  223                 ipc_port_dealloc_kernel(MOBJ->memory_object);
  224         }
  225 }
  226 
  227 m_copy_data_request(mobj, kobj, offset, length, desired_access)
  228         xmm_obj_t mobj;
  229         xmm_obj_t kobj;
  230         vm_offset_t offset;
  231         vm_size_t length;
  232         vm_prot_t desired_access;
  233 {
  234         extern zone_t vm_map_copy_zone;
  235         vm_map_copy_t copy;
  236         kern_return_t kr;
  237         
  238 #ifdef  lint
  239         M_DATA_REQUEST(mobj, kobj, offset, length, desired_access);
  240 #endif  lint
  241         assert(page_aligned(offset));
  242         assert(page_aligned(length));
  243         assert(length == PAGE_SIZE);
  244         assert(offset + length <= MOBJ->size);
  245 
  246         kr = vm_map_copyin_page_list(MOBJ->map,
  247                                      MOBJ->start + offset,
  248                                      PAGE_SIZE,
  249                                      FALSE,/* src_destroy */
  250                                      TRUE,/* steal pages */
  251                                      &copy,
  252                                      FALSE/* is continuation */);
  253         if (kr) {
  254                 fret("xmm_copy_data_request 0x%x 0x%x 0x%x: %x\n",
  255                      MOBJ->start, offset, length, kr);
  256                 return K_DATA_ERROR(kobj, offset, length, kr);
  257         }
  258         /* XXX should only return appropriate access */
  259         return K_DATA_SUPPLY(kobj, offset, (vm_offset_t) copy, length,
  260                              VM_PROT_NONE, FALSE, XMM_REPLY_NULL);
  261 }

Cache object: b09afc407a6aa9238c7008f036caf806


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