feat: extend ata with Bitmap

include/ata.h

@@ -0,0 +1,34 @@
+#ifndef FROSTBYTE_ATA_H
+#define FROSTBYTE_ATA_H
+
+#include "types.h"
+
+/*
+ * ATA PIO driver (primary bus, master drive only, LBA28 addressing).
+ *
+ * This talks to real IDE hardware registers (0x1F0-0x1F7 + the 0x3F6
+ * alternate-status/device-control port) using polling, not IRQ14: ataInit
+ * disables the drive's interrupt line (nIEN) up front, so every command is
+ * driven by busy-waiting on the status register. That keeps the driver
+ * usable from the in-kernel test harness, which runs before the scheduler
+ * and with interrupts disabled.
+ *
+ * All polling loops are bounded (ataPollTimeout iterations): a missing or
+ * wedged drive returns false/failure instead of hanging the kernel forever.
+ */
+
+#define ataSectorSize 512
+
+bool ataInit(void);
+bool ataPresent(void);
+uint64 ataSectorCount(void);
+const char* ataModelString(void);
+
+/* count is a sector count in [0, 255]; 0 trivially succeeds without
+   touching hardware. Both fail (return false) if no drive was found by
+   ataInit, if the request runs past ataSectorCount(), or if the drive
+   reports an error/timeout mid-transfer. */
+bool ataReadSectors(uint64 lba, uint32 count, void* buffer);
+bool ataWriteSectors(uint64 lba, uint32 count, const void* buffer);
+
+#endif