Bananymous/banan-os
1
1
Fork 1
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Kernel: mmap regions are now demand paged

Browse Source 
mmap will not actually take any memory unless you use the given
memory.
This commit is contained in:
Bananymous
2023-09-28 21:07:14 +03:00
parent 15cd59b8ce
commit 245f58cc3a
7 changed files with 149 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
kernel/include/kernel/Memory/VirtualRange.h
View File

@@ -15,9 +15,9 @@ namespace Kernel
public:
// Create virtual range to fixed virtual address
static BAN::ErrorOr<BAN::UniqPtr<VirtualRange>> create_to_vaddr(PageTable&, vaddr_t, size_t, PageTable::flags_t flags);
static BAN::ErrorOr<BAN::UniqPtr<VirtualRange>> create_to_vaddr(PageTable&, vaddr_t, size_t, PageTable::flags_t flags, bool preallocate_pages);
// Create virtual range to virtual address range
static BAN::ErrorOr<BAN::UniqPtr<VirtualRange>> create_to_vaddr_range(PageTable&, vaddr_t vaddr_start, vaddr_t vaddr_end, size_t, PageTable::flags_t flags);
static BAN::ErrorOr<BAN::UniqPtr<VirtualRange>> create_to_vaddr_range(PageTable&, vaddr_t vaddr_start, vaddr_t vaddr_end, size_t, PageTable::flags_t flags, bool preallocate_pages);
// Create virtual range in kernel memory with kmalloc
static BAN::ErrorOr<BAN::UniqPtr<VirtualRange>> create_kmalloc(size_t);
~VirtualRange();
@@ -28,15 +28,21 @@ namespace Kernel
size_t size() const { return m_size; }
PageTable::flags_t flags() const { return m_flags; }
void set_zero();
bool contains(vaddr_t address) const { return vaddr() <= address && address < vaddr() + size(); }
BAN::ErrorOr<void> allocate_page_for_demand_paging(vaddr_t address);
void copy_from(size_t offset, const uint8_t* buffer, size_t bytes);
private:
VirtualRange(PageTable&);
VirtualRange(PageTable&, bool preallocated, bool kmalloc);
void set_zero();
private:
PageTable& m_page_table;
bool m_kmalloc { false };
const bool m_preallocated;
const bool m_kmalloc;
vaddr_t m_vaddr { 0 };
size_t m_size { 0 };
PageTable::flags_t m_flags { 0 };