85 lines
1.8 KiB
C++
85 lines
1.8 KiB
C++
/*
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* \brief Multiboot handling
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* \author Christian Helmuth
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* \author Alexander Boettcher
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* \date 2006-05-09
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*/
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/*
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* Copyright (C) 2006-2015 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _MULTIBOOT_H_
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#define _MULTIBOOT_H_
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/* base includes */
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#include <util/mmio.h>
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namespace Genode { class Multiboot_info; }
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class Genode::Multiboot_info : Mmio
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{
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private:
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struct Flags : Register<0x00, 32> {
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struct Mem_map : Bitfield<6, 1> { };
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};
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struct Mmap_length: Register<0x2c, 32> { };
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struct Mmap_addr : Register<0x30, 32> { };
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public:
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Multiboot_info(addr_t mbi) : Mmio(mbi) { }
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Multiboot_info(addr_t mbi, bool strip);
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struct Mmap : Genode::Mmio {
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struct Size : Register <0x00, 32> { };
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struct Addr : Register <0x04, 64> { };
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struct Length : Register <0x0c, 64> { };
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struct Type : Register <0x14, 8> { enum { MEMORY = 1 }; };
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Mmap(addr_t mmap = 0) : Mmio(mmap) { }
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};
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/**
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* Physical ram regions
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*/
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Mmap phys_ram(unsigned i, bool solely_within_4k_base = true) {
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if (!read<Flags::Mem_map>())
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return Mmap(0);
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Mmap_length::access_t const mmap_length = read<Mmap_length>();
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Mmap_addr::access_t const mmap_start = read<Mmap_addr>();
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for (Genode::uint32_t j = 0, mmap = mmap_start;
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mmap < mmap_start + mmap_length;) {
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enum { MMAP_SIZE_SIZE_OF = 4, MMAP_SIZE_OF = 4 + 8 + 1 };
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if (solely_within_4k_base &&
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(mmap + MMAP_SIZE_OF >= Genode::align_addr(base + 1, 12)))
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return Mmap(0);
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Mmap r(mmap);
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mmap += r.read<Mmap::Size>() + MMAP_SIZE_SIZE_OF;
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if (r.read<Mmap::Type>() != Mmap::Type::MEMORY)
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continue;
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if (i == j)
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return r;
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j++;
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}
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return Mmap(0);
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}
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};
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#endif /* _MULTIBOOT_H_ */
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