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#include <cstdint>
#include <drivers/disk.hpp>
#include <generic/hhdm.hpp>
#include <generic/pmm.hpp>
#include <drivers/mbr.hpp>
#include <utils/assert.hpp>
#include <klibc/string.hpp>
#include <drivers/gpt.hpp>
#include <drivers/ext2.hpp>
std::uint8_t linux_fs_signature[16] = {
0xAF, 0x3D, 0xC6, 0x0F,
0x83, 0x84,
0x72, 0x47,
0x8E, 0x79, 0x3D, 0x69, 0xD8, 0x47, 0x7D, 0xE4
};
const char* disk_type_to_str(partition_style disk_type) {
switch(disk_type) {
case partition_style::err:
return "Unknown";
case partition_style::mbr:
return "MBR";
case partition_style::gpt:
return "GPT";
case partition_style::raw:
return "Raw";
}
}
partition_style determine_disk_type(disk* target_disk) {
char* buffer = (char*)(pmm::freelist::alloc_4k() + etc::hhdm());
target_disk->read(target_disk->arg, (char*)buffer, 1, 1);
if(!klibc::memcmp((const char*)buffer, GPT_SIGNATURE, sizeof(GPT_SIGNATURE))) {
pmm::freelist::free((std::uint64_t)buffer - etc::hhdm());
return partition_style::gpt;
}
target_disk->read(target_disk->arg, (char*)buffer, 0, 1);
if(((mbr_sector*)buffer)->signature == 0xAA55) {
pmm::freelist::free((std::uint64_t)buffer - etc::hhdm());
return partition_style::mbr;
}
assert(0, "Unknown partition style");
return partition_style::err;
}
bool disk_selftest(disk* target_disk) {
char* buffer = (char*)(pmm::freelist::alloc_4k() + etc::hhdm());
if(target_disk->read(target_disk->arg, buffer, 0, 1) == true) {
pmm::freelist::free((std::uint64_t)buffer - etc::hhdm());
return true;
} else {
klibc::printf("Disk: Failed to do disk selftest\r\n");
return false;
}
}
const char* mbr_to_str(std::uint8_t type) {
switch (type)
{
case 0x83:
return "linux";
case 0xb:
return "fat32";
default:
return "unknown";
}
return "unknown";
}
bool disk_try_linux(disk* new_disk) {
bytes_to_block_res b = bytes_to_blocks(1024, 1024, new_disk->lba_size);
char* buffer = (char*)(pmm::freelist::alloc_4k() + etc::hhdm());
new_disk->read(new_disk->arg, buffer, b.lba, b.size_in_blocks);
ext2_superblock *sb = (ext2_superblock*)((std::uint64_t)buffer + b.offset);
if (sb->s_magic == EXT2_MAGIC) {
#ifdef MBR_ORANGE_TRACE
klibc::printf("Disk: Detected ext2\r\n");
#endif
drivers::ext2::init(new_disk, 0);
pmm::freelist::free((std::uint64_t)buffer - etc::hhdm());
return true;
} else {
pmm::freelist::free((std::uint64_t)buffer - etc::hhdm());
return false;
}
return false;
}
void disk_do_mbr_linux(disk* new_disk, std::uint64_t start_lba) {
bytes_to_block_res b = bytes_to_blocks(1024, 1024, new_disk->lba_size);
char* buffer = (char*)(pmm::freelist::alloc_4k() + etc::hhdm());
new_disk->read(new_disk->arg, buffer, start_lba + b.lba, b.size_in_blocks);
ext2_superblock *sb = (ext2_superblock*)((std::uint64_t)buffer + b.offset);
if (sb->s_magic == EXT2_MAGIC) {
#ifdef MBR_ORANGE_TRACE
klibc::printf("Disk: Detected ext2\r\n");
#endif
drivers::ext2::init(new_disk, start_lba);
}
pmm::freelist::free((std::uint64_t)buffer - etc::hhdm());
}
void disk_do_mbr(disk* new_disk) {
char* buffer = (char*)(pmm::freelist::alloc_4k() + etc::hhdm());
new_disk->read(new_disk->arg, (char*)buffer, 0, 1);
mbr_sector* mbr = (mbr_sector*)buffer;
for(int i = 0; i < 4; i++) {
if(mbr->partitions[i].partition_type != 0) {
#ifdef MBR_ORANGE_TRACE
klibc::printf("Disk: Detected mbr partition type %s (%d), lba_start %lli\r\n", mbr_to_str(mbr->partitions[i].partition_type), mbr->partitions[i].partition_type, mbr->partitions[i].lba_start);
#endif
if(mbr->partitions[i].partition_type == 0x83) {
disk_do_mbr_linux(new_disk, mbr->partitions[i].lba_start);
}
}
}
pmm::freelist::free((std::uint64_t)buffer - etc::hhdm());
}
void print_gpt_guid(uint8_t *g) {
klibc::printf("%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X\r\n",
g[3], g[2], g[1], g[0],
g[5], g[4],
g[7], g[6],
g[8], g[9],
g[10], g[11], g[12],
g[13], g[14], g[15]);
}
void disk_do_gpt(disk* new_disk) {
char* buffer = (char*)(pmm::freelist::alloc_4k() + etc::hhdm());
new_disk->read(new_disk->arg, (char*)buffer, 1, 1);
gpt_lba1 lba1 = {};
klibc::memcpy(&lba1, buffer, sizeof(gpt_lba1));
new_disk->read(new_disk->arg, (char*)buffer, lba1.partition_lba, 1);
gpt_partition_entry* part_table = (gpt_partition_entry*)buffer;
for(std::size_t i = 0;i < lba1.count_partitions; i++) {
gpt_partition_entry entry = part_table[i];
if(klibc::memcmp(entry.guid, (uint8_t[16]){0}, 16) == 0) continue;
#ifdef MBR_ORANGE_TRACE
klibc::printf("gpt: detected fs with start_lba %lli with type ",entry.start_lba);
print_gpt_guid(entry.guid);
#endif
if(klibc::memcmp(entry.guid, linux_fs_signature, 16) == 0) {
#ifdef MBR_ORANGE_TRACE
klibc::printf("gpt: detected linux fs\r\n");
#endif
disk_do_mbr_linux(new_disk, entry.start_lba);
}
}
pmm::freelist::free((std::uint64_t)buffer - etc::hhdm());
}
void drivers::init_disk(disk* new_disk) {
if(disk_selftest(new_disk) == false)
return;
partition_style style = determine_disk_type(new_disk);
klibc::printf("Disk: Detected %s partition style\r\n", disk_type_to_str(style));
switch (style)
{
case partition_style::mbr:
disk_do_mbr(new_disk);
break;
case partition_style::gpt:
disk_do_gpt(new_disk);
break;
default:
bool status = disk_try_linux(new_disk);
if(status == false)
assert(0,"unsupported disk\r\n");
break;
}
}
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