xmm_shadow.c

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1992 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_shadow.c,v $
   29  * Revision 2.2  92/03/10  16:29:43  jsb
   30  *      Merged in norma branch changes as of NORMA_MK7.
   31  *      [92/03/09  12:51:50  jsb]
   32  * 
   33  * Revision 2.1.3.3  92/02/21  11:28:09  jsb
   34  *      Explicitly provide name parameter to xmm_decl macro.
   35  *      [92/02/16  14:24:15  jsb]
   36  * 
   37  *      Disabled; use the vm system to manage copies.
   38  *      [92/02/11  11:08:14  jsb]
   39  * 
   40  *      Removed *_internal_memory_object garbage.
   41  *      [92/02/11  11:00:23  jsb]
   42  * 
   43  *      First real implementation. Moved internal_memory_object routines here.
   44  *      [92/02/09  14:19:11  jsb]
   45  * 
   46  */
   47 /*
   48  *      File:   norma/xmm_shadow.c
   49  *      Author: Joseph S. Barrera III
   50  *      Date:   1992
   51  *
   52  *      Xmm layer to handle writes to a read-only object.
   53  *      Interim solution until we can do lazy copies of svm memory.
   54  */
   55 
   56 #if     0
   57 
   58 #include <norma/xmm_obj.h>
   59 #include <mach/vm_param.h>
   60 #include <ipc/ipc_space.h>
   61 #include <ipc/ipc_port.h>
   62 
   63 struct mobj {
   64         struct xmm_obj  obj;
   65         ipc_port_t      memory_object;  /* must be second field */
   66         xmm_obj_t       next;           /* must be third field */
   67         vm_size_t       size;
   68         boolean_t       *present;
   69         vm_map_copy_t   *page;          /* XXX should create internal pager */
   70 };
   71 
   72 #undef  KOBJ
   73 #define KOBJ    ((struct mobj *) kobj)
   74 
   75 kern_return_t m_shadow_terminate();
   76 kern_return_t m_shadow_data_request();
   77 kern_return_t m_shadow_data_write();
   78 
   79 xmm_decl(shadow_class,
   80         /* m_init               */      m_interpose_init,
   81         /* m_terminate          */      m_shadow_terminate,
   82         /* m_copy               */      m_interpose_copy,
   83         /* m_data_request       */      m_shadow_data_request,
   84         /* m_data_unlock        */      m_interpose_data_unlock,
   85         /* m_data_write         */      m_shadow_data_write,
   86         /* m_lock_completed     */      m_interpose_lock_completed,
   87         /* m_supply_completed   */      m_interpose_supply_completed,
   88         /* m_data_return        */      m_interpose_data_return,
   89         /* m_change_completed   */      m_interpose_change_completed,
   90 
   91         /* k_data_unavailable   */      k_interpose_data_unavailable,
   92         /* k_get_attributes     */      k_interpose_get_attributes,
   93         /* k_lock_request       */      k_interpose_lock_request,
   94         /* k_data_error         */      k_interpose_data_error,
   95         /* k_set_ready          */      k_interpose_set_ready,
   96         /* k_destroy            */      k_interpose_destroy,
   97         /* k_data_supply        */      k_interpose_data_supply,
   98 
   99         /* name                 */      "shadow",
  100         /* size                 */      sizeof(struct mobj)
  101 );
  102 
  103 kern_return_t
  104 xmm_shadow_create(old_mobj, size, new_mobj)
  105         xmm_obj_t old_mobj;
  106         vm_size_t size;
  107         xmm_obj_t *new_mobj;
  108 {
  109         xmm_obj_t mobj;
  110         kern_return_t kr;
  111 
  112         assert(page_aligned(size));
  113         kr = xmm_obj_allocate(&shadow_class, old_mobj, &mobj);
  114         if (kr != KERN_SUCCESS) {
  115                 return kr;
  116         }
  117         MOBJ->size = size;
  118         MOBJ->present = (boolean_t *) kalloc(atop(size) * sizeof(boolean_t));
  119         bzero(MOBJ->present, atop(size) * sizeof(boolean_t));
  120         MOBJ->page = (vm_map_copy_t *)
  121             kalloc(atop(MOBJ->size) * sizeof(vm_map_copy_t));
  122         bzero(MOBJ->page, atop(MOBJ->size) * sizeof(vm_map_copy_t));
  123         *new_mobj = mobj;
  124         return KERN_SUCCESS;
  125 }
  126 
  127 m_shadow_terminate(mobj, kobj, memory_object_name)
  128         xmm_obj_t mobj;
  129         xmm_obj_t kobj;
  130         ipc_port_t memory_object_name;
  131 {
  132         unsigned long page;
  133         kern_return_t kr;
  134 
  135         for (page = 0; page < atop(MOBJ->size); page++) {
  136                 if (MOBJ->page[page]) {
  137                         vm_map_copy_discard(MOBJ->page[page]);
  138                 }
  139         }
  140         kfree(MOBJ->present, atop(MOBJ->size) * sizeof(boolean_t));
  141         remove_internal_memory_object(mobj);
  142         kr = M_TERMINATE(mobj, mobj, memory_object_name);
  143         xmm_obj_deallocate(mobj);
  144         return kr;
  145 }
  146 
  147 m_shadow_data_request(mobj, kobj, offset, length, desired_access)
  148         xmm_obj_t mobj;
  149         xmm_obj_t kobj;
  150         vm_offset_t offset;
  151         vm_size_t length;
  152         vm_prot_t desired_access;
  153 {
  154         extern zone_t vm_map_copy_zone;
  155         vm_map_copy_t copy;
  156         unsigned long page;
  157         
  158         assert(page_aligned(offset));
  159         assert(page_aligned(length));
  160         assert(length == PAGE_SIZE);
  161         assert(offset + length <= MOBJ->size);
  162 
  163         /*
  164          * If the page is not shadowed, pass request down to source obj.
  165          */
  166         page = atop(offset);
  167         if (! MOBJ->present[page]) {
  168                 return M_DATA_REQUEST(mobj, kobj, offset, length,
  169                                       desired_access);
  170         }
  171 
  172         /*
  173          * Copy the shadowed page.
  174          * MOBJ->page[page] is a object flavor copy object.
  175          * We need to keep a copy here (for multiple pageins),
  176          * and we need a page list copy object anyway.
  177          */
  178         if (MOBJ->page[page] == VM_MAP_COPY_NULL) {
  179                 panic("m_shadow_data_request: absent page");
  180         }
  181         copy = (vm_map_copy_t) xmm_buffer_copy(MOBJ->page[page]);
  182 
  183         /*
  184          * Provide the page list copy object containing the page
  185          * to the kernel.
  186          */
  187         return K_DATA_SUPPLY(kobj, offset, (vm_offset_t) copy, length,
  188                              VM_PROT_NONE, FALSE, XMM_REPLY_NULL);
  189 }
  190 
  191 kern_return_t
  192 m_shadow_data_write(mobj, kobj, offset, data, length)
  193         xmm_obj_t       mobj;
  194         xmm_obj_t       kobj;
  195         vm_offset_t     offset;
  196         vm_offset_t     data;
  197         vm_size_t       length;
  198 {
  199         unsigned long page;
  200         vm_map_copy_t copy = (vm_map_copy_t) data;
  201 
  202         assert(page_aligned(offset));
  203         assert(page_aligned(length));
  204         assert(length == PAGE_SIZE);
  205         assert(offset + length <= MOBJ->size);
  206 
  207         page = atop(offset);
  208         if (MOBJ->present[page]) {
  209                 assert(MOBJ->page[page]);
  210                 vm_map_copy_discard(MOBJ->page[page]);
  211         }
  212         MOBJ->present[page] = TRUE;
  213         MOBJ->page[page] = copy;
  214         return KERN_SUCCESS;
  215 }
  216 
  217 /* ---------------------------------------------------------------------- */
  218 
  219 #if     666
  220 /*
  221  * This should live somewhere else
  222  */
  223 xmm_obj_t       internal_mobj_list;
  224 
  225 boolean_t
  226 is_internal_memory_object(memory_object, new_mobj)
  227         ipc_port_t memory_object;
  228         xmm_obj_t *new_mobj;
  229 {
  230         xmm_obj_t mobj;
  231 
  232         for (mobj = internal_mobj_list; mobj; mobj = MOBJ->next) {
  233                 if (MOBJ->memory_object == memory_object) {
  234                         *new_mobj = mobj;
  235                         return TRUE;
  236                 }
  237         }
  238         return FALSE;
  239 }
  240 
  241 add_internal_memory_object(mobj, memory_object_p)
  242         xmm_obj_t mobj;
  243         ipc_port_t *memory_object_p;
  244 {
  245         MOBJ->memory_object = ipc_port_alloc_kernel();
  246         if (MOBJ->memory_object == IP_NULL) {
  247                 panic("add_internal_memory_object: ipc_port_alloc_kernel");
  248         }
  249         MOBJ->memory_object = ipc_port_make_send(MOBJ->memory_object);
  250 
  251         MOBJ->next = internal_mobj_list;
  252         internal_mobj_list = mobj;
  253 
  254         *memory_object_p = MOBJ->memory_object;
  255 }
  256 
  257 #define MP    ((struct mobj *) (*mp))
  258 
  259 remove_internal_memory_object(mobj)
  260         xmm_obj_t mobj;
  261 {
  262         xmm_obj_t *mp;
  263 
  264         for (mp = &internal_mobj_list; *mp; mp = &MP->next) {
  265                 if (*mp == mobj) {
  266                         /* XXX deallocate MOBJ->memory_object? */
  267                         *mp = MOBJ->next;
  268                         return;
  269                 }
  270         }
  271         assert(0);
  272 }
  273 #endif  666
  274 
  275 #endif  0

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FreeBSD/Linux Kernel Cross Reference sys/norma/xmm_shadow.c

FreeBSD/Linux Kernel Cross Reference
sys/norma/xmm_shadow.c