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Kernel: Add page table api to map multiple fast pages

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This is not currently used, but can be handy in the future
This commit is contained in:
Bananymous
2026-05-03 00:55:06 +03:00
parent b8dc199738
commit 8091127150
3 changed files with 55 additions and 24 deletions
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38
kernel/arch/i686/PageTable.cpp
View File

@@ -231,26 +231,40 @@ namespace Kernel
void PageTable::map_fast_page(paddr_t paddr)
{
ASSERT(paddr && paddr % PAGE_SIZE == 0);
ASSERT(s_fast_page_pt);
ASSERT(s_fast_page_lock.current_processor_has_lock());
ASSERT(!(*s_fast_page_pt & Flags::Present));
s_fast_page_pt[0] = paddr | Flags::ReadWrite | Flags::Present;
asm volatile("invlpg (%0)" :: "r"(fast_page()));
map_fast_page(0, paddr);
}
void PageTable::unmap_fast_page()
{
unmap_fast_page(0);
}
void* PageTable::map_fast_page(size_t index, paddr_t paddr)
{
ASSERT(paddr && paddr % PAGE_SIZE == 0);
ASSERT(index < 512);
ASSERT(s_fast_page_pt);
ASSERT(s_fast_page_lock.current_processor_has_lock());
ASSERT((*s_fast_page_pt & Flags::Present));
s_fast_page_pt[0] = 0;
ASSERT(!(s_fast_page_pt[index] & Flags::Present));
s_fast_page_pt[index] = paddr | Flags::ReadWrite | Flags::Present;
asm volatile("invlpg (%0)" :: "r"(fast_page()));
void* address = reinterpret_cast<void*>(fast_page() + index * PAGE_SIZE);
asm volatile("invlpg (%0)" :: "r"(address));
return address;
}
void PageTable::unmap_fast_page(size_t index)
{
ASSERT(index < 512);
ASSERT(s_fast_page_pt);
ASSERT(s_fast_page_lock.current_processor_has_lock());
ASSERT((s_fast_page_pt[index] & Flags::Present));
s_fast_page_pt[index] = 0;
asm volatile("invlpg (%0)" :: "r"(fast_page() + index * PAGE_SIZE));
}
BAN::ErrorOr<PageTable*> PageTable::create_userspace()

38
kernel/arch/x86_64/PageTable.cpp
View File

@@ -369,26 +369,40 @@ namespace Kernel
void PageTable::map_fast_page(paddr_t paddr)
{
ASSERT(paddr && paddr % PAGE_SIZE == 0);
ASSERT(s_fast_page_pt);
ASSERT(s_fast_page_lock.current_processor_has_lock());
ASSERT(!(*s_fast_page_pt & Flags::Present));
s_fast_page_pt[0] = paddr | Flags::ReadWrite | Flags::Present;
asm volatile("invlpg (%0)" :: "r"(fast_page()));
map_fast_page(0, paddr);
}
void PageTable::unmap_fast_page()
{
unmap_fast_page(0);
}
void* PageTable::map_fast_page(size_t index, paddr_t paddr)
{
ASSERT(paddr && paddr % PAGE_SIZE == 0);
ASSERT(index < 512);
ASSERT(s_fast_page_pt);
ASSERT(s_fast_page_lock.current_processor_has_lock());
ASSERT((*s_fast_page_pt & Flags::Present));
s_fast_page_pt[0] = 0;
ASSERT(!(s_fast_page_pt[index] & Flags::Present));
s_fast_page_pt[index] = paddr | Flags::ReadWrite | Flags::Present;
asm volatile("invlpg (%0)" :: "r"(fast_page()));
void* address = reinterpret_cast<void*>(fast_page() + index * PAGE_SIZE);
asm volatile("invlpg (%0)" :: "r"(address));
return address;
}
void PageTable::unmap_fast_page(size_t index)
{
ASSERT(index < 512);
ASSERT(s_fast_page_pt);
ASSERT(s_fast_page_lock.current_processor_has_lock());
ASSERT((s_fast_page_pt[index] & Flags::Present));
s_fast_page_pt[index] = 0;
asm volatile("invlpg (%0)" :: "r"(fast_page() + index * PAGE_SIZE));
}
BAN::ErrorOr<PageTable*> PageTable::create_userspace()

3
kernel/include/kernel/Memory/PageTable.h
View File

@@ -149,6 +149,9 @@ namespace Kernel
static void map_fast_page(paddr_t);
static void unmap_fast_page();
static void* map_fast_page(size_t index, paddr_t);
static void unmap_fast_page(size_t index);
private:
paddr_t m_highest_paging_struct { 0 };
mutable RecursiveSpinLock m_lock;