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* large_memory_physical_page_ops_init(): Don't assign the return value before

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it is fully initialized.
* arch_vm_translation_map_is_kernel_page_accessible(): Check whether
  sPhysicalPageMapper has already been initialized.

If a panic() during or before the initialization of the physical page mapper
occurred, we no longer access a partially initialized object or a NULL pointer.
This should fix the triple fault part of #1925.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35644 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2010-02-27 21:20:29 +00:00
parent dcd2d7c4a7
commit 4891bed4d2
2 changed files with 7 additions and 4 deletions
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8
src/system/kernel/arch/x86/arch_vm_translation_map.cpp
View File

@ -1446,7 +1446,7 @@ arch_vm_translation_map_is_kernel_page_accessible(addr_t virtualAddress,
if (physicalPageDirectory == (addr_t)sKernelPhysicalPageDirectory) {
pageDirectoryEntry = sKernelVirtualPageDirectory[index];
} else {
} else if (sPhysicalPageMapper != NULL) {
// map the original page directory and get the entry
void* handle;
addr_t virtualPageDirectory;
@ -1459,13 +1459,15 @@ arch_vm_translation_map_is_kernel_page_accessible(addr_t virtualAddress,
handle);
} else
pageDirectoryEntry = 0;
}
} else
pageDirectoryEntry = 0;
// map the page table and get the entry
page_table_entry pageTableEntry;
index = VADDR_TO_PTENT(virtualAddress);
if ((pageDirectoryEntry & X86_PDE_PRESENT) != 0) {
if ((pageDirectoryEntry & X86_PDE_PRESENT) != 0
&& sPhysicalPageMapper != NULL) {
void* handle;
addr_t virtualPageTable;
status_t error = sPhysicalPageMapper->GetPageDebug(

3
src/system/kernel/arch/x86/x86_physical_page_mapper_large_memory.cpp
View File

@ -918,8 +918,9 @@ large_memory_physical_page_ops_init(kernel_args* args,
X86PhysicalPageMapper*& _pageMapper,
TranslationMapPhysicalPageMapper*& _kernelPageMapper)
{
_pageMapper = new(&sPhysicalPageMapper) LargeMemoryPhysicalPageMapper;
new(&sPhysicalPageMapper) LargeMemoryPhysicalPageMapper;
sPhysicalPageMapper.Init(args, _kernelPageMapper);
_pageMapper = &sPhysicalPageMapper;
return B_OK;
}