mirror of
https://github.com/SerenityOS/serenity
synced 2024-09-15 22:21:01 +00:00
69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
/*
|
|
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/NonnullOwnPtr.h>
|
|
#include <AK/StringView.h>
|
|
#include <AK/Try.h>
|
|
#include <Kernel/Memory/MemoryManager.h>
|
|
|
|
namespace Kernel::Memory {
|
|
|
|
template<typename T>
|
|
struct TypedMapping {
|
|
T const* ptr() const { return reinterpret_cast<T const*>(region->vaddr().offset(offset).as_ptr()); }
|
|
T* ptr() { return reinterpret_cast<T*>(region->vaddr().offset(offset).as_ptr()); }
|
|
VirtualAddress base_address() const { return region->vaddr().offset(offset); }
|
|
T const* operator->() const { return ptr(); }
|
|
T* operator->() { return ptr(); }
|
|
T const& operator*() const { return *ptr(); }
|
|
T& operator*() { return *ptr(); }
|
|
OwnPtr<Region> region;
|
|
PhysicalAddress paddr;
|
|
size_t offset { 0 };
|
|
size_t length { 0 };
|
|
};
|
|
|
|
template<typename T>
|
|
static ErrorOr<NonnullOwnPtr<TypedMapping<T>>> adopt_new_nonnull_own_typed_mapping(PhysicalAddress paddr, size_t length, Region::Access access = Region::Access::Read)
|
|
{
|
|
auto mapping_length = TRY(page_round_up(paddr.offset_in_page() + length));
|
|
auto region = TRY(MM.allocate_kernel_region(paddr.page_base(), mapping_length, {}, access));
|
|
auto table = TRY(adopt_nonnull_own_or_enomem(new (nothrow) Memory::TypedMapping<T>()));
|
|
table->region = move(region);
|
|
table->offset = paddr.offset_in_page();
|
|
table->paddr = paddr;
|
|
table->length = length;
|
|
return table;
|
|
}
|
|
|
|
template<typename T>
|
|
static ErrorOr<TypedMapping<T>> map_typed(PhysicalAddress paddr, size_t length, Region::Access access = Region::Access::Read)
|
|
{
|
|
TypedMapping<T> table;
|
|
auto mapping_length = TRY(page_round_up(paddr.offset_in_page() + length));
|
|
table.region = TRY(MM.allocate_kernel_region(paddr.page_base(), mapping_length, {}, access));
|
|
table.offset = paddr.offset_in_page();
|
|
table.paddr = paddr;
|
|
table.length = length;
|
|
return table;
|
|
}
|
|
|
|
template<typename T>
|
|
static ErrorOr<TypedMapping<T>> map_typed(PhysicalAddress paddr)
|
|
{
|
|
return map_typed<T>(paddr, sizeof(T));
|
|
}
|
|
|
|
template<typename T>
|
|
static ErrorOr<TypedMapping<T>> map_typed_writable(PhysicalAddress paddr)
|
|
{
|
|
return map_typed<T>(paddr, sizeof(T), Region::Access::Read | Region::Access::Write);
|
|
}
|
|
|
|
}
|