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base: support parsing multiboot for phys. memory

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Issue #1741
This commit is contained in:
Alexander Boettcher 2015-10-27 16:00:06 +01:00 committed by Christian Helmuth
parent 7ea5884ffc
commit f42f946f3b
1 changed files with 36 additions and 4 deletions
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40
repos/base/src/core/include/multiboot.h
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@ -45,10 +45,7 @@ class Genode::Multiboot_info : Mmio
struct Size : Register <0x00, 32> { };
struct Addr : Register <0x04, 64> { };
struct Length : Register <0x0c, 64> { };
struct Type : Register <0x14, 8> {
struct Memory : Bitfield<0, 1> { };
struct Reserved : Bitfield<1, 1> { };
};
struct Type : Register <0x14, 8> { enum { MEMORY = 1 }; };
Mmap(addr_t mmap = 0) : Mmio(mmap) { }
};
@ -87,6 +84,41 @@ class Genode::Multiboot_info : Mmio
* The module is marked as invalid in MBI and cannot be gotten again
*/
Rom_module get_module(unsigned num);
/**
* Physical ram regions
*/
Mmap phys_ram(unsigned i, bool solely_within_4k_base = true) {
if (!read<Flags::Mem_map>())
return Mmap(0);
Mmap_length::access_t const mmap_length = read<Mmap_length>();
Mmap_addr::access_t const mmap_start = read<Mmap_addr>();
for (Genode::uint32_t j = 0, mmap = mmap_start;
mmap < mmap_start + mmap_length;) {
enum { MMAP_SIZE_SIZE_OF = 4, MMAP_SIZE_OF = 4 + 8 + 1 };
if (solely_within_4k_base &&
(mmap + MMAP_SIZE_OF >= Genode::align_addr(base + 1, 12)))
return Mmap(0);
Mmap r(mmap);
mmap += r.read<Mmap::Size>() + MMAP_SIZE_SIZE_OF;
if (r.read<Mmap::Type>() != Mmap::Type::MEMORY)
continue;
if (i == j)
return r;
j++;
}
return Mmap(0);
}
};
#endif /* _CORE__INCLUDE__MULTIBOOT_H_ */