basic fs type stuff, fat16, removing stack segment and using data segment

1 files changed, 33 insertions, 4 deletions

diff --git a/src/kernel/fat.h b/src/kernel/fat.h
index 0fbf59f..73eaaae 100644
--- a/src/kernel/fat.h
+++ b/src/kernel/fat.h
@@ -1,4 +1,5 @@
 #include <stdint.h>
+#include <stdbool.h>
 
 #define FAT_INFO ((struct fat_info *)0x7c03)
 
@@ -24,9 +25,37 @@ struct fat_info {
   uint8_t  fs_type[8];
 } __attribute__ ((packed));
 
-#define FAT ((void *)0x00026000)
+enum {
+  FA_READ_ONLY = 0x01,
+  FA_HIDDEN    = 0x02,
+  FA_SYSTEM    = 0x04,
+  FA_LABEL     = 0x08,
+  FA_DIRECTORY = 0x10,
+  FA_ARCHIVE   = 0x20,
+
+  FA_LFN       = 0x0f
+};
+
+struct directory_entry {
+  uint8_t name[11];
+  uint8_t attrib;
+  uint8_t name_case;
+  uint8_t created_decimal;
+  uint16_t created_time;
+  uint16_t created_date;
+  uint16_t accessed_date;
+  uint16_t ignore;
+  uint16_t modified_time;
+  uint16_t modified_date;
+  uint16_t first_cluster;
+  uint32_t length;
+} __attribute__ ((packed));
+
+#define FAT ((uint16_t *)0x00020000)
 void load_fat();
-uint16_t get_cluster(uint16_t n);
-void set_cluster(uint16_t n, uint16_t v);
 
-uint16_t get_start_cluster(uint8_t *path);
\ No newline at end of file
+#define CTOS(c) (FAT_INFO->reserved_sectors + FAT_INFO->sectors_per_fat + (FAT_INFO->root_entries >> 4) + (c) - 2)
+
+bool get_entry(uint8_t *path, struct directory_entry *at);
+bool update_entry(uint8_t *path, struct directory_entry *value);
+bool create_entry(uint8_t *path, struct directory_entry *value);
\ No newline at end of file