Changeset 157 for trunk/src/os2ahci/init.asm

Timestamp:

May 8, 2013, 5:10:33 PM (12 years ago)

Author:

David Azarewicz

Message:

Fixed up timer functions

File:

• trunk/src/os2ahci/init.asm (modified) (2 diffs)

trunk/src/os2ahci/init.asm

@@ -29 +29 @@
                 PUBLIC  _end_of_data         ; end of all data (label)
                 PUBLIC  _end_of_code         ; end of all code (label)
+                PUBLIC  _udelay              ; spin for microseconds
+                EXTRN   DOSIODELAYCNT:ABS
 
 ; ----------------------------------------------------------------------------
@@ -198 +200 @@
                 .386
 
+; void udelay(u16 microseconds);
+_udelay         PROC NEAR
+                enter   0, 0
+                mov     cx, word ptr [bp+4]
+@OuterLoop:
+                mov     ax, DOSIODELAYCNT
+                shl     ax, 1
+@InnerLoop:
+                dec     ax
+                jnz     short @InnerLoop                
+                loop    @OuterLoop
+
+                leave
+                ret
+_udelay          ENDP
 
 ; Read long value from MMIO address; need to do this here to get real