[haiku-commits] r38293 - haiku/trunk/src/system/kernel/arch/ppc
- From: andreas.faerber@xxxxxx
- To: haiku-commits@xxxxxxxxxxxxx
- Date: Sat, 21 Aug 2010 04:12:25 +0200 (CEST)
Author: andreasf
Date: 2010-08-21 04:12:25 +0200 (Sat, 21 Aug 2010)
New Revision: 38293
Changeset: http://dev.haiku-os.org/changeset/38293
Ticket: http://dev.haiku-os.org/ticket/6163
Modified:
haiku/trunk/src/system/kernel/arch/ppc/arch_vm_translation_map.cpp
Log:
ppc: Implement arch_vm_translation_map_is_kernel_page_accessible()
This remedies "Current thread pointer [...] is an address we can't read from."
on entering KDL. Closes ticket #6163.
Modified: haiku/trunk/src/system/kernel/arch/ppc/arch_vm_translation_map.cpp
===================================================================
--- haiku/trunk/src/system/kernel/arch/ppc/arch_vm_translation_map.cpp
2010-08-21 00:36:09 UTC (rev 38292)
+++ haiku/trunk/src/system/kernel/arch/ppc/arch_vm_translation_map.cpp
2010-08-21 02:12:25 UTC (rev 38293)
@@ -887,6 +887,20 @@
arch_vm_translation_map_is_kernel_page_accessible(addr_t virtualAddress,
uint32 protection)
{
- // TODO: Implement!
- return false;
+ VMAddressSpace *addressSpace = VMAddressSpace::Kernel();
+
+ PPCVMTranslationMap* map = static_cast<PPCVMTranslationMap*>(
+ addressSpace->TranslationMap());
+
+ phys_addr_t physicalAddress;
+ uint32 flags;
+ if (map->Query(virtualAddress, &physicalAddress, &flags) != B_OK)
+ return false;
+
+ if ((flags & PAGE_PRESENT) == 0)
+ return false;
+
+ // present means kernel-readable, so check for writable
+ return (protection & B_KERNEL_WRITE_AREA) == 0
+ || (flags & B_KERNEL_WRITE_AREA) != 0;
}
Other related posts:
- » [haiku-commits] r38293 - haiku/trunk/src/system/kernel/arch/ppc - andreas . faerber
