95 lines
2.3 KiB
C++
95 lines
2.3 KiB
C++
/*
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* \brief Multiboot 2 handling
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* \author Alexander Boettcher
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* \date 2017-08-11
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*/
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/*
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* Copyright (C) 2017 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 Affero General Public License version 3.
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*/
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#ifndef _SRC__BOOTSTRAP__SPEC__X86_64__MULTIBOOT2_H_
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#define _SRC__BOOTSTRAP__SPEC__X86_64__MULTIBOOT2_H_
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/* base includes */
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#include <util/mmio.h>
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namespace Genode { class Multiboot2_info; }
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class Genode::Multiboot2_info : Mmio
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{
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private:
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struct Size : Register <0x0, 32> { };
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struct Tag : Genode::Mmio {
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enum { LOG2_SIZE = 3 };
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struct Type : Register <0x00, 32>
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{
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enum { END = 0, MEMORY = 6, ACPI_RSDP = 15 };
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};
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struct Size : Register <0x04, 32> { };
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Tag(addr_t addr) : Mmio(addr) { }
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};
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public:
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enum { MAGIC = 0x36d76289UL };
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struct Memory : Genode::Mmio {
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enum { SIZE = 3 * 8 };
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struct Addr : Register <0x00, 64> { };
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struct Size : Register <0x08, 64> { };
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struct Type : Register <0x10, 32> { enum { MEMORY = 1 }; };
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Memory(addr_t mmap = 0) : Mmio(mmap) { }
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};
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Multiboot2_info(addr_t mbi) : Mmio(mbi) { }
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template <typename FUNC_MEM, typename FUNC_ACPI>
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void for_each_tag(FUNC_MEM mem_fn, FUNC_ACPI acpi_fn)
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{
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addr_t const size = read<Multiboot2_info::Size>();
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for (addr_t tag_addr = base() + (1UL << Tag::LOG2_SIZE);
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tag_addr < base() + size;)
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{
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Tag tag(tag_addr);
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if (tag.read<Tag::Type>() == Tag::Type::END)
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return;
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if (tag.read<Tag::Type>() == Tag::Type::MEMORY) {
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addr_t mem_start = tag_addr + (1UL << Tag::LOG2_SIZE) + 8;
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addr_t const mem_end = tag_addr + tag.read<Tag::Size>();
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for (; mem_start < mem_end; mem_start += Memory::SIZE) {
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Memory mem(mem_start);
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mem_fn(mem);
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}
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}
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if (tag.read<Tag::Type>() == Tag::Type::ACPI_RSDP) {
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size_t const sizeof_tag = 1UL << Tag::LOG2_SIZE;
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addr_t const rsdp_addr = tag_addr + sizeof_tag;
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Hw::Acpi_rsdp * rsdp = reinterpret_cast<Hw::Acpi_rsdp *>(rsdp_addr);
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if (rsdp->valid() &&
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sizeof(*rsdp) >= tag.read<Tag::Size>() - sizeof_tag)
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acpi_fn(*rsdp);
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}
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tag_addr += align_addr(tag.read<Tag::Size>(), Tag::LOG2_SIZE);
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}
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}
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};
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#endif /* _SRC__BOOTSTRAP__SPEC__X86_64__MULTIBOOT2_H_ */
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