Changeset 76 for hacks/xtide/atalib.h

Timestamp:

Dec 28, 2015, 2:37:00 AM (10 years ago)

Author:

bird

Message:

xtide-utils: ataid fixes. new delay method.

File:

• hacks/xtide/atalib.h (modified) (1 diff)

hacks/xtide/atalib.h

@@ -103 +103 @@
 #define ATA_FV_XFERMODE_MWDMA_MODE_XXX_FLAG          UINT8_C(0x20)
 
+
+#define ATA_PIT_FREQ                        UINT32_C(1193182)
+void AtaDelayPitTicks(uint8_t cTicks);
+#pragma aux AtaDelayPitTicks = \
+    "pushf" \
+    "cli" \
+    "in     al, 40h" \
+    "mov    ch, al" /* ch = prev */ \
+ "again:" \
+    "nop" \
+    "in     al, 40h" \
+    "sub    ch, al" /* ch = ticks elapsed */ \
+    "sub    cl, ch" /* check if ticks left is <= ticks elapsed; update ticks left. */ \
+    "mov    ch, al" /* ch = prev tick count */ \
+    "ja     again" \
+    "popf" \
+    parm [cl] \
+    modify exact [ax cx];
+
 /** Delay a bit by reading PIC mask. Should take 4-5 bus cycles,
  * and thus be more than the required 400ns delay on old computers. */
-#define ATA_DELAY_400NS()   do { inp(0x21); } while (0)
+#if 0
+# define ATA_DELAY_400NS()   do { inp(0x21); } while (0)
+# define ATA_DELAY_5US()     \
+    do { ATA_DELAY_400NS(); ATA_DELAY_400NS(); ATA_DELAY_400NS(); ATA_DELAY_400NS(); ATA_DELAY_400NS(); \
+         ATA_DELAY_400NS(); ATA_DELAY_400NS(); ATA_DELAY_400NS(); ATA_DELAY_400NS(); ATA_DELAY_400NS(); \
+         ATA_DELAY_400NS(); ATA_DELAY_400NS(); ATA_DELAY_400NS(); \
+    } while (0)
+#else
+# define ATA_DELAY_400NS()   AtaDelayPitTicks(1)
+# define ATA_DELAY_5US()     AtaDelayPitTicks(6)
+#endif
+
 
 extern uint16_t g_cHeads;