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Kernel: Allow specifying a physical alignment when allocating

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Some drivers may require allocating contiguous physical pages with
a specific alignment for the physical address.
This commit is contained in:
Tom 2020-12-05 22:49:24 -07:00 • committed by Andreas Kling
parent d5472426ec
commit affb4ef01b
6 changed files with 29 additions and 23 deletions
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8
Kernel/VM/ContiguousVMObject.cpp
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@ -31,15 +31,15 @@
namespace Kernel {
NonnullRefPtr<ContiguousVMObject> ContiguousVMObject::create_with_size(size_t size)
NonnullRefPtr<ContiguousVMObject> ContiguousVMObject::create_with_size(size_t size, size_t physical_alignment)
{
return adopt(*new ContiguousVMObject(size));
return adopt(*new ContiguousVMObject(size, physical_alignment));
}
ContiguousVMObject::ContiguousVMObject(size_t size)
ContiguousVMObject::ContiguousVMObject(size_t size, size_t physical_alignment)
: VMObject(size)
{
auto contiguous_physical_pages = MM.allocate_contiguous_supervisor_physical_pages(size);
auto contiguous_physical_pages = MM.allocate_contiguous_supervisor_physical_pages(size, physical_alignment);
for (size_t i = 0; i < page_count(); i++) {
physical_pages()[i] = contiguous_physical_pages[i];
dbgln<CONTIGUOUS_VMOBJECT_DEBUG>("Contiguous page[{}]: {}", i, physical_pages()[i]->paddr());