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Kernel: Move userspace virtual address range base to 0x10000

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Now that the shared bottom 2 MiB virtual address mappings are gone
userspace can use lower virtual addresses.
This commit is contained in:
Idan Horowitz 2021-12-19 19:36:42 +02:00 • committed by Brian Gianforcaro
parent fccd0432a1
commit 5f4a67434c
7 changed files with 18 additions and 4 deletions
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2
Kernel/Memory/PageDirectory.cpp
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@ -44,7 +44,7 @@ UNMAP_AFTER_INIT NonnullRefPtr<PageDirectory> PageDirectory::must_create_kernel_
ErrorOr<NonnullRefPtr<PageDirectory>> PageDirectory::try_create_for_userspace(VirtualRangeAllocator const* parent_range_allocator)
{
constexpr FlatPtr userspace_range_base = 0x00800000;
constexpr FlatPtr userspace_range_base = USER_RANGE_BASE;
FlatPtr const userspace_range_ceiling = USER_RANGE_CEILING;
auto directory = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) PageDirectory));

2
Kernel/Memory/Region.cpp
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@ -179,7 +179,7 @@ bool Region::map_individual_page_impl(size_t page_index)
VERIFY(m_page_directory->get_lock().is_locked_by_current_processor());
auto page_vaddr = vaddr_from_page_index(page_index);
bool user_allowed = page_vaddr.get() >= 0x00800000 && is_user_address(page_vaddr);
bool user_allowed = page_vaddr.get() >= USER_RANGE_BASE && is_user_address(page_vaddr);
if (is_mmap() && !user_allowed) {
PANIC("About to map mmap'ed page at a kernel address");
}

2
Kernel/Memory/Region.h
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@ -89,7 +89,7 @@ public:
void set_mmap(bool mmap) { m_mmap = mmap; }
[[nodiscard]] bool is_user() const { return !is_kernel(); }
[[nodiscard]] bool is_kernel() const { return vaddr().get() < 0x00800000 || vaddr().get() >= kernel_mapping_base; }
[[nodiscard]] bool is_kernel() const { return vaddr().get() < USER_RANGE_BASE || vaddr().get() >= kernel_mapping_base; }
PageFaultResponse handle_fault(PageFault const&);