src/kernel/drive.c


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#include "drive.h"
#include "panic.h"
#include "fat.h"

uint8_t n_drives;
struct drive drives[256];

void init_drives() {
  n_drives = 0;
}

__attribute__ ((const))
static file_id_t unknown_get_file(const struct drive *d, const char *path) {
  return 0;
}

static void unknown_free_file(const struct drive *d, file_id_t fid) {
  PANIC("Free file called on unknown file system.");
}

static void unknown_load_sector(const struct drive *d, file_id_t fid, uint32_t sector, void *at) {
  PANIC("Load sector called on unknown file system.");
}

static uint32_t unknown_get_file_length(const struct drive *d, file_id_t fid) {
  PANIC("Get file length called on unknown file system.");
}

__attribute__ ((const))
static uint32_t unknown_get_free_sectors(const struct drive *d) {
  return -1;
}

__attribute__ ((const))
static uint32_t unknown_enumerate_dir(const struct drive *d, const char *path, struct directory_content_info *info, uint32_t max) {
  return 0;
}

__attribute__ ((const))
static uint32_t unknown_n_dir_entries(const struct drive *d, const char *path) {
  return 0;
}

static inline void determine_fs(struct drive *d) {
  if (try_fat_init_drive(d))
    return;

  d->fs_type = "Unknown";
  d->get_file = &unknown_get_file;
  d->free_file = &unknown_free_file;
  d->load_sector = &unknown_load_sector;
  d->get_file_length = &unknown_get_file_length;
  d->enumerate_dir = &unknown_enumerate_dir;
  d->n_dir_entries = &unknown_n_dir_entries;
  d->get_free_sectors = &unknown_get_free_sectors;
}

//drive should be ready before this.
//determine_fs and its children
//do not need to make ready or done
void commit_drive(struct drive data) {
  determine_fs(&data);
  drives[n_drives] = data;
  data.done(drives + n_drives);
  ++n_drives;
}