Changeset 133 for trunk/src/os2ahci/init.asm

Timestamp:

May 16, 2012, 10:19:24 AM (13 years ago)

Author:

Markus Thielen

Message:

• (#13) added IDC entry point to allow switching back to BIOS mode
• added IDCTEST driver and program for testing the IDC entry point
• fixed bug in IOCTL handling (missing 'break')

File:

• trunk/src/os2ahci/init.asm (modified) (4 diffs)

trunk/src/os2ahci/init.asm

@@ -6 +6 @@
 
 ; -----------------------------------------------------------------------------
+; Constants
+                DEV_IDC  EQU    0400h        ;  IDC bit for ADD flags
+        
+; -----------------------------------------------------------------------------
 ; Public symbols
 
                 PUBLIC  _asm_strat           ; low-level strategy routine
+                PUBLIC  _asm_idc_entry       ; low-level IDC entry point 
                 PUBLIC  _readl               ; MMIO read (32 bits)
                 PUBLIC  _writel              ; MMIO write (32 bits)
@@ -29 +34 @@
 DEVHDR          SEGMENT WORD PUBLIC 'DATA'
 _dev_hdr        dd      _legacy_hdr             ; next device header
-                dw      DEVLEV_3 + DEV_CHAR_DEV ; flags for ADD drivers
+                dw      DEVLEV_3 + DEV_CHAR_DEV + DEV_IDC ; flags for ADD drivers
                 dw      OFFSET _asm_strat       ; strategy routine
-                dw      0                       ; no IDC routine
+                dw      OFFSET _asm_idc_entry   ; IDC entry point
                 db      "OS2AHCI$"              ; name of character device
                 dq      0                       ; 8 reserved bytes
@@ -40 +45 @@
                 dw      DEVLEV_3 + DEV_CHAR_DEV ; flags for ADD drivers
                 dw      OFFSET _asm_strat       ; strategy routine
-                dw      0                       ; no IDC routine
+                dw      0                       ; IDC entry point
                 db      "IBMS506$"              ; name of character device
                 dq      0                       ; 8 reserved bytes
@@ -129 +134 @@
                 RET
 _asm_strat      ENDP
+
+
+; IDC entry point (Assembler stub)
+_asm_idc_entry  PROC    FAR
+        
+                ; push request packet address
+                PUSH    ES
+                PUSH    BX
+                CLD
+
+                ; call C IDC entry point - which is the strategy routine
+                CALL    _c_strat
+
+                POP     BX
+                POP     ES
+                MOV     WORD PTR ES:[BX+3], AX
+                RET
+_asm_idc_entry  ENDP
 
                 .386