src/system/kernel/arch/arm/arch_vm.cpp

   1 /*
   2  * Copyright 2007, François Revol, revol@free.fr.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Copyright 2003-2005, Axel Dörfler, axeld@pinc-software.de.
   6  * Distributed under the terms of the MIT License.
   7  *
   8  * Copyright 2001, Travis Geiselbrecht. All rights reserved.
   9  * Distributed under the terms of the NewOS License.
  10  */
  11
  12
  13 #include <KernelExport.h>
  14
  15 #include <kernel.h>
  16 #include <boot/kernel_args.h>
  17
  18 #include <vm/vm.h>
  19 #include <vm/vm_types.h>
  20 #include <arch/vm.h>
  21 //#include <arch_mmu.h>
  22
  23
  24 //#define TRACE_ARCH_VM
  25 #ifdef TRACE_ARCH_VM
  26 #       define TRACE(x) dprintf x
  27 #else
  28 #       define TRACE(x) ;
  29 #endif
  30
  31
  32 status_t
  33 arch_vm_init(kernel_args *args)
  34 {
  35         TRACE(("arch_vm_init: entry\n"));
  36         return B_OK;
  37 }
  38
  39
  40 status_t
  41 arch_vm_init2(kernel_args *args)
  42 {
  43         return B_OK;
  44 }
  45
  46
  47 status_t
  48 arch_vm_init_post_area(kernel_args *args)
  49 {
  50         TRACE(("arch_vm_init_post_area: entry\n"));
  51         return B_OK;
  52 }
  53
  54
  55 status_t
  56 arch_vm_init_end(kernel_args *args)
  57 {
  58         // Throw away all mappings that are unused by the kernel
  59         vm_free_unused_boot_loader_range(KERNEL_LOAD_BASE, KERNEL_SIZE);
  60
  61         return B_OK;
  62 }
  63
  64
  65 status_t
  66 arch_vm_init_post_modules(kernel_args *args)
  67 {
  68         return B_OK;
  69 }
  70
  71
  72 void
  73 arch_vm_aspace_swap(struct VMAddressSpace *from, struct VMAddressSpace *to)
  74 {
  75         // This functions is only invoked when a userland thread is in the process
  76         // of dying. It switches to the kernel team and does whatever cleanup is
  77         // necessary (in case it is the team's main thread, it will delete the
  78         // team).
  79         // It is however not necessary to change the page directory. Userland team's
  80         // page directories include all kernel mappings as well. Furthermore our
  81         // arch specific translation map data objects are ref-counted, so they won't
  82         // go away as long as they are still used on any CPU.
  83 }
  84
  85
  86 bool
  87 arch_vm_supports_protection(uint32 protection)
  88 {
  89         // TODO check ARM protection possibilities
  90         return true;
  91 }
  92
  93
  94 void
  95 arch_vm_unset_memory_type(VMArea *area)
  96 {
  97         // TODO
  98 }
  99
 100
 101 status_t
 102 arch_vm_set_memory_type(VMArea *area, phys_addr_t physicalBase, uint32 type)
 103 {
 104         if (type != 0)
 105                 dprintf("%s: undefined type %lx!\n", __PRETTY_FUNCTION__, type);
 106
 107         return B_OK;
 108 }