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https://github.com/justinian/jsix.git
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9f54927a82
The enum_bitfields system never worked quite right, and always had edge cases where name resolution for the SFINAE would fail. Move everything over to use util::bitset, which can be constexpr and boils down to inline integer bitops in release mode. Improved util::bitset itself, moving the array-backed base implementation into a new util::sized_bitset, and making the single-inttype backed implementation the base case. Also added a distinction between | or |= (which work with real bit values) and + or += (which work with bit indexes).
56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
#include <uefi/boot_services.h>
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#include <uefi/types.h>
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#include "bootconfig.h"
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#include "error.h"
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#include "fs.h"
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#include "status.h"
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namespace boot {
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constexpr uint64_t jsixboot = 0x746f6f627869736a; // "jsixboot"
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static const wchar_t *
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read_string(util::buffer &data)
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{
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uint16_t size = *util::read<uint16_t>(data);
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const wchar_t *string = reinterpret_cast<const wchar_t*>(data.pointer);
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data += size;
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return string;
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}
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static void
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read_descriptor(descriptor &e, util::buffer &data)
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{
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e.flags = util::bitset16 {*util::read<uint16_t>(data)};
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e.path = read_string(data);
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}
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bootconfig::bootconfig(util::buffer data, uefi::boot_services *bs)
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{
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status_line status {L"Loading boot config"};
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if (*util::read<uint64_t>(data) != jsixboot)
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error::raise(uefi::status::load_error, L"Bad header in boot config");
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const uint8_t version = *util::read<uint8_t>(data);
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if (version != 1)
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error::raise(uefi::status::incompatible_version, L"Bad version in boot config");
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uint8_t num_panics = *util::read<uint8_t>(data);
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m_flags = *util::read<uint16_t>(data);
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read_descriptor(m_kernel, data);
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read_descriptor(m_init, data);
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m_initrd = read_string(data);
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m_symbols = read_string(data);
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m_panics.count = num_panics;
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m_panics.pointer = new descriptor [num_panics];
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for (unsigned i = 0; i < num_panics; ++i)
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read_descriptor(m_panics[i], data);
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}
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} // namespace boot
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