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fatfs: Add simple GPT support

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This allows for a simple GPT parsing and checking first partition to see if it's FAT based.

This allows hekate booting GPT with tiny size cost.
This commit is contained in:
CTCaer
2021-02-05 23:27:52 +02:00
parent 8b30bd4b57
commit 15a7e49dde
7 changed files with 44 additions and 4 deletions
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14
bdk/libs/fatfs/ff.c
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@@ -38,6 +38,7 @@
#include "ff.h" /* Declarations of FatFs API */
#include "diskio.h" /* Declarations of device I/O functions */
#include <storage/mbr_gpt.h>
#include <gfx_utils.h>
#define EFSPRINTF(text, ...) print_error(); gfx_printf("%k"text"%k\n", 0xFFFFFF00, 0xFFFFFFFF);
@@ -3284,6 +3285,7 @@ static FRESULT find_volume ( /* FR_OK(0): successful, !=0: an error occurred */
/* Following code attempts to mount the volume. (analyze BPB and initialize the filesystem object) */
fs->fs_type = 0; /* Clear the filesystem object */
fs->part_type = 0; /* Clear the Partition object */
fs->pdrv = LD2PD(vol); /* Bind the logical drive and a physical drive */
stat = disk_initialize(fs->pdrv); /* Initialize the physical drive */
if (stat & STA_NOINIT) { /* Check if the initialization succeeded */
@@ -3318,6 +3320,18 @@ static FRESULT find_volume ( /* FR_OK(0): successful, !=0: an error occurred */
EFSPRINTF("BRNL");
return FR_DISK_ERR; /* An error occured in the disk I/O layer */
}
#if FF_SIMPLE_GPT
if (fmt >= 2) {
/* If GPT Check the first partition */
gpt_t gpt;
if (disk_read(fs->pdrv, (BYTE *)&gpt, 1, sizeof(gpt_t) / SS(fs))) return FR_DISK_ERR;
if (!mem_cmp(&gpt.header.signature, "EFI PART", 8)) {
fs->part_type = 1;
bsect = gpt.entries[0].lba_start;
fmt = bsect ? check_fs(fs, bsect) : 3; /* Check the partition */
}
}
#endif
if (fmt >= 2) {
EFSPRINTF("NOFAT");
return FR_NO_FILESYSTEM; /* No FAT volume is found */

1
bdk/libs/fatfs/ff.h
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@@ -97,6 +97,7 @@ typedef DWORD FSIZE_t;
typedef struct {
BYTE win[FF_MAX_SS]; /* Disk access window for Directory, FAT (and file data at tiny cfg) */
BYTE fs_type; /* Filesystem type (0:not mounted) */
BYTE part_type; /* Partition type (0:MBR, 1:GPT) */
BYTE pdrv; /* Associated physical drive */
BYTE n_fats; /* Number of FATs (1 or 2) */
BYTE wflag; /* win[] flag (b0:dirty) */

1
bdk/storage/nx_sd.h
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@@ -51,6 +51,7 @@ bool sd_initialize(bool power_cycle);
bool sd_mount();
void sd_unmount();
void sd_end();
bool sd_is_gpt();
void *sd_file_read(const char *path, u32 *fsize);
int sd_save_to_file(void *buf, u32 size, const char *filename);