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9c6834698f
In a previous commit I moved everything into the new subdirectories in FileSystem/SysFS directory without trying to actually make changes in the code itself too much. Now it's time to split the code to make it more readable and understandable, hence this change occurs now.
41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Firmware/BIOS.h>
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#include <Kernel/Memory/MemoryManager.h>
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#include <Kernel/Memory/TypedMapping.h>
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namespace Kernel {
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ErrorOr<Memory::MappedROM> map_bios()
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{
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Memory::MappedROM mapping;
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mapping.size = 128 * KiB;
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mapping.paddr = PhysicalAddress(0xe0000);
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auto region_size = TRY(Memory::page_round_up(mapping.size));
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mapping.region = TRY(MM.allocate_kernel_region(mapping.paddr, region_size, {}, Memory::Region::Access::Read));
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return mapping;
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}
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ErrorOr<Memory::MappedROM> map_ebda()
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{
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auto ebda_segment_ptr = TRY(Memory::map_typed<u16>(PhysicalAddress(0x40e)));
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PhysicalAddress ebda_paddr(PhysicalAddress(*ebda_segment_ptr).get() << 4);
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// The EBDA size is stored in the first byte of the EBDA in 1K units
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size_t ebda_size = *TRY(Memory::map_typed<u8>(ebda_paddr));
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ebda_size *= 1024;
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Memory::MappedROM mapping;
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auto region_size = TRY(Memory::page_round_up(ebda_size));
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mapping.region = TRY(MM.allocate_kernel_region(ebda_paddr.page_base(), region_size, {}, Memory::Region::Access::Read));
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mapping.offset = ebda_paddr.offset_in_page();
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mapping.size = ebda_size;
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mapping.paddr = ebda_paddr;
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return mapping;
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}
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}
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