source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH23h_HFeatures.asm@ 3

Last change on this file since 3 was 3, checked in by Tomi Tilli, 15 years ago
File size: 2.2 KB
Line 
1; File name : AH23h_HFeatures.asm
2; Project name : IDE BIOS
3; Created date : 28.12.2009
4; Last update : 12.4.2010
5; Author : Tomi Tilli
6; Description : Int 13h function AH=23h,
7; Set Controller Features Register.
8
9; Section containing code
10SECTION .text
11
12;--------------------------------------------------------------------
13; Int 13h function AH=23h, Set Controller Features Register.
14;
15; AH23h_HandlerForSetControllerFeatures
16; Parameters:
17; AH: Bios function 23h
18; AL: Feature Number (parameter to Features Register = subcommand)
19; DL: Drive number (8xh)
20; Parameters loaded by Int13h_Jump:
21; DS: RAMVARS segment
22; Parameter registers are undocumented, specific for this BIOS:
23; BH: Parameter to Sector Count Register (subcommand specific)
24; BL: Parameter to Sector Number Register (subcommand specific)
25; CL: Parameter to Low Cylinder Register (subcommand specific)
26; CH: Parameter to High Cylinder Register (subcommand specific)
27; Returns:
28; AH: Int 13h return status
29; CF: 0 if succesfull, 1 if error
30; IF: 1
31; Corrupts registers:
32; Flags
33;--------------------------------------------------------------------
34ALIGN JUMP_ALIGN
35AH23h_HandlerForSetControllerFeatures:
36 push dx
37 push cx
38 push bx
39 push ax
40 push si
41
42 ; Backup AL and BH to SI
43 mov ah, bh
44 xchg si, ax
45
46 ; Select Master or Slave and wait until ready
47 call FindDPT_ForDriveNumber ; DS:DI now points to DPT
48 call HDrvSel_SelectDriveAndDisableIRQ
49 jc SHORT .Return ; Return if error
50
51 ; Output Feature Number
52 mov ax, si ; Feature number to AL
53 mov dx, [RAMVARS.wIdeBase] ; Load base port address
54 inc dx ; REGW_IDE_FEAT
55 out dx, al
56
57 ; Output parameters to Sector Number Register and Cylinder Registers
58 xor bh, bh ; Zero head number
59 dec dx ; Back to base port address
60 call HCommand_OutputTranslatedLCHSaddress
61
62 ; Output parameter to Sector Count Register and command
63 xchg ax, si ; Sector Count Reg param to AH
64 mov al, ah ; Sector Count Reg param to AL
65 mov ah, HCMD_SET_FEAT ; Load Set Features command to AH
66 call HCommand_OutputSectorCountAndCommand
67
68 call HStatus_WaitBsyDefTime ; Wait until drive ready
69.Return:
70 pop si
71 jmp Int13h_PopXRegsAndReturn
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