1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Functions for loading correct transfer command. |
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3 | |
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4 | ; Section containing code |
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5 | SECTION .text |
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6 | |
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7 | %ifdef MODULE_EBIOS |
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8 | ;-------------------------------------------------------------------- |
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9 | ; CommandLookup_GetEbiosIndexToBX |
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10 | ; Parameters: |
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11 | ; DS:DI: Ptr to DPT |
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12 | ; ES:SI: Ptr to DAP (Disk Address Packet) |
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13 | ; Returns: |
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14 | ; BX: Index to command lookup table |
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15 | ; Corrupts registers: |
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16 | ; AX, DX |
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17 | ;-------------------------------------------------------------------- |
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18 | ALIGN JUMP_ALIGN |
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19 | CommandLookup_GetEbiosIndexToBX: |
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20 | ; LBA28 or LBA48 command |
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21 | xor dx, dx |
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22 | mov al, [es:si+DAP.qwLBA+3] ; Load LBA48 byte 3 (bits 24...31) |
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23 | and ax, 00F0h ; Clear LBA28 bits 24...27 |
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24 | or ax, [es:si+DAP.qwLBA+4] ; Set bits from LBA bytes 4 and 5 |
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25 | cmp dx, ax ; Set CF if any of bits 28...47 set |
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26 | rcl dx, 1 ; DX = 0 for LBA28, DX = 1 for LBA48 |
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27 | call CommandLookup_GetOldInt13hIndexToBX |
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28 | or bx, dx ; Set block mode / single sector bit |
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29 | ret |
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30 | %endif |
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31 | |
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32 | ;-------------------------------------------------------------------- |
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33 | ; CommandLookup_GetOldInt13hIndexToBX |
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34 | ; Parameters: |
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35 | ; DS:DI: Ptr to DPT |
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36 | ; Returns: |
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37 | ; BX: Index to command lookup table |
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38 | ; Corrupts registers: |
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39 | ; Nothing |
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40 | ;-------------------------------------------------------------------- |
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41 | ALIGN JUMP_ALIGN |
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42 | CommandLookup_GetOldInt13hIndexToBX: |
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43 | ; Block mode or single sector |
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44 | mov bl, [di+DPT.bFlagsHigh] |
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45 | and bx, BYTE FLGH_DPT_BLOCK_MODE_SUPPORTED ; Bit 1 |
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46 | ret |
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47 | |
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48 | |
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49 | g_rgbReadCommandLookup: |
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50 | db COMMAND_READ_SECTORS ; 00b, CHS or LBA28 single sector |
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51 | db COMMAND_READ_SECTORS_EXT ; 01b, LBA48 single sector |
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52 | db COMMAND_READ_MULTIPLE ; 10b, CHS or LBA28 block mode |
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53 | db COMMAND_READ_MULTIPLE_EXT ; 11b, LBA48 block mode |
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54 | |
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55 | g_rgbWriteCommandLookup: |
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56 | db COMMAND_WRITE_SECTORS |
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57 | db COMMAND_WRITE_SECTORS_EXT |
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58 | db COMMAND_WRITE_MULTIPLE |
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59 | db COMMAND_WRITE_MULTIPLE_EXT |
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60 | |
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61 | g_rgbVerifyCommandLookup: |
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62 | db COMMAND_VERIFY_SECTORS |
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63 | db COMMAND_VERIFY_SECTORS_EXT |
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64 | db COMMAND_VERIFY_SECTORS |
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65 | db COMMAND_VERIFY_SECTORS_EXT |
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