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Fix M.2 performance by aligning lba.

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This commit is contained in:
Andy Nguyen
2026-05-24 22:23:46 +02:00
parent 1bb9ed410b
commit 6444634c46
1 changed files with 20 additions and 10 deletions
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30
m2_init.c
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@@ -21,8 +21,10 @@
#define GPT_PRIMARY_PARTITION_TABLE_LBA 1
#define GPT_ENTRY_NUMBERS 32
#define GPT_ENTRY_SIZE 128
#define GPT_ARRAY_SECTORS ((GPT_ENTRY_NUMBERS * GPT_ENTRY_SIZE) / SECTOR_SIZE)
#define GPT_RESERVED_SECTORS \
(GPT_PRIMARY_PARTITION_TABLE_LBA + GPT_ENTRY_NUMBERS)
(GPT_PRIMARY_PARTITION_TABLE_LBA + GPT_ARRAY_SECTORS)
#define UUID_SIZE 16
@@ -116,7 +118,8 @@ int main(int argc, char *argv[]) {
uint64_t total_sectors = bytes / SECTOR_SIZE;
uint64_t lastlba = total_sectors - 1 - PS5_M2_PART44_LBA_OFFSET;
uint64_t first_usable_lba = PS5_M2_MBR_LBA + GPT_RESERVED_SECTORS + 1;
uint64_t last_usable_lba = lastlba - GPT_RESERVED_SECTORS;
uint64_t last_usable_lba = lastlba - GPT_ARRAY_SECTORS - 1;
uint64_t size_in_lba = lastlba - PS5_M2_MBR_LBA;
printf("Disk Info:\n");
printf(" Total Bytes: %" PRIu64 "\n", bytes);
@@ -132,19 +135,20 @@ int main(int argc, char *argv[]) {
mbr.partition_record[0].os_type = EFI_PMBR_OSTYPE_EFI_GPT;
mbr.partition_record[0].starting_lba =
PS5_M2_MBR_LBA + GPT_PRIMARY_PARTITION_TABLE_LBA;
mbr.partition_record[0].size_in_lba = lastlba - PS5_M2_MBR_LBA;
mbr.partition_record[0].size_in_lba =
(size_in_lba > 0xffffffff) ? 0xffffffff : (uint32_t)size_in_lba;
printf("\nMBR Info:\n");
printf(" MBR Start LBA: %u\n", mbr.partition_record[0].starting_lba);
printf(" MBR Size (LBA): %u\n", mbr.partition_record[0].size_in_lba);
uint8_t entries[SECTOR_SIZE * GPT_ENTRY_NUMBERS] = {};
uint8_t entries[SECTOR_SIZE * GPT_ARRAY_SECTORS] = {};
gpt_entry *pte = (gpt_entry *)entries;
pte[0].partition_type_guid = PARTITION_LINUX_FILE_SYSTEM_DATA_GUID;
memset(pte[0].unique_partition_guid.b, 0x41, UUID_SIZE);
pte[0].starting_lba = first_usable_lba;
pte[0].ending_lba = last_usable_lba;
pte[0].starting_lba = ((first_usable_lba + 2047) / 2048) * 2048;
pte[0].ending_lba = ((last_usable_lba + 1) / 2048) * 2048 - 1;
uint8_t gpt_sector[SECTOR_SIZE] = {};
gpt_header *gpt = (gpt_header *)gpt_sector;
@@ -157,8 +161,8 @@ int main(int argc, char *argv[]) {
gpt->last_usable_lba = last_usable_lba;
gpt->partition_entry_lba =
PS5_M2_MBR_LBA + GPT_PRIMARY_PARTITION_TABLE_LBA + 1;
gpt->num_partition_entries = sizeof(entries) / sizeof(gpt_entry);
gpt->sizeof_partition_entry = sizeof(gpt_entry);
gpt->num_partition_entries = GPT_ENTRY_NUMBERS;
gpt->sizeof_partition_entry = GPT_ENTRY_SIZE;
memset(gpt->disk_guid.b, 0x42, UUID_SIZE);
gpt->partition_entry_array_crc32 = crc32(0L, entries, sizeof(entries));
@@ -196,7 +200,7 @@ int main(int argc, char *argv[]) {
gpt->my_lba = lastlba;
gpt->alternate_lba = PS5_M2_MBR_LBA + GPT_PRIMARY_PARTITION_TABLE_LBA;
gpt->partition_entry_lba = lastlba - GPT_ENTRY_NUMBERS;
gpt->partition_entry_lba = lastlba - GPT_ARRAY_SECTORS;
gpt->header_crc32 = 0;
gpt->header_crc32 = crc32(0L, (uint8_t *)gpt, gpt->header_size);
@@ -205,7 +209,7 @@ int main(int argc, char *argv[]) {
printf(" Partition Entry LBA: %" PRIu64 "\n", gpt->partition_entry_lba);
// Write alternate gpt.
if (lseek(fd, (off_t)(lastlba - GPT_ENTRY_NUMBERS) * SECTOR_SIZE, SEEK_SET) ==
if (lseek(fd, (off_t)(lastlba - GPT_ARRAY_SECTORS) * SECTOR_SIZE, SEEK_SET) ==
(off_t)-1) {
perror("lseek");
close(fd);
@@ -227,6 +231,12 @@ int main(int argc, char *argv[]) {
return EXIT_FAILURE;
}
if (fsync(fd) == -1) {
perror("fsync");
close(fd);
return EXIT_FAILURE;
}
printf("\nSuccessfully added Linux partition to m2.\n");
close(fd);