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