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1682f0b760
SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringView.h>
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#include <Kernel/Arch/PC/BIOS.h>
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#include <Kernel/VM/MemoryManager.h>
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#include <Kernel/VM/TypedMapping.h>
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namespace Kernel {
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MappedROM map_bios()
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{
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MappedROM mapping;
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mapping.size = 128 * KiB;
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mapping.paddr = PhysicalAddress(0xe0000);
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mapping.region = MM.allocate_kernel_region(mapping.paddr, page_round_up(mapping.size), {}, Region::Access::Read);
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return mapping;
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}
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MappedROM map_ebda()
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{
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auto ebda_segment_ptr = map_typed<u16>(PhysicalAddress(0x40e));
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auto ebda_length_ptr_b0 = map_typed<u8>(PhysicalAddress(0x413));
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auto ebda_length_ptr_b1 = map_typed<u8>(PhysicalAddress(0x414));
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PhysicalAddress ebda_paddr(*ebda_segment_ptr << 4);
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size_t ebda_size = (*ebda_length_ptr_b1 << 8) | *ebda_length_ptr_b0;
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MappedROM mapping;
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mapping.region = MM.allocate_kernel_region(ebda_paddr.page_base(), page_round_up(ebda_size), {}, 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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