[90] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 2 | ; Description : Int 13h BIOS functions (Floppy and Hard disk). |
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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 | ;-------------------------------------------------------------------- |
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| 8 | ; Int 13h software interrupt handler. |
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| 9 | ; Jumps to specific function defined in AH. |
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| 10 | ; |
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[148] | 11 | ; Note to developers: Do not make recursive INT 13h calls! |
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| 12 | ; |
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| 13 | ; Int13h_DiskFunctionsHandler |
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[3] | 14 | ; Parameters: |
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| 15 | ; AH: Bios function |
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| 16 | ; DL: Drive number |
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[148] | 17 | ; Other: Depends on function |
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[3] | 18 | ; Returns: |
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| 19 | ; Depends on function |
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| 20 | ;-------------------------------------------------------------------- |
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| 21 | ALIGN JUMP_ALIGN |
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[148] | 22 | Int13h_DiskFunctionsHandler: |
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[3] | 23 | sti ; Enable interrupts |
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[150] | 24 | cld ; String instructions to increment pointers |
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[155] | 25 | CREATE_FRAME_INTPACK_TO_SSBP EXTRA_BYTES_FOR_INTPACK |
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[3] | 26 | |
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| 27 | call RamVars_GetSegmentToDS |
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[262] | 28 | |
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[148] | 29 | call DriveXlate_ToOrBack |
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| 30 | mov [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv], dl |
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[262] | 31 | |
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| 32 | call FindDPT_ForDriveNumberInDL ; DS:DI points to our DPT, or NULL if not our drive |
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| 33 | jnc SHORT .OurFunction ; DPT found, this is one of our drives, and thus our function |
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[258] | 34 | |
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[262] | 35 | cmp ah, 0 |
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| 36 | jz short .OurFunction ; we handle all function 0h requests (resets) |
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| 37 | cmp ah, 8 |
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| 38 | %ifdef MODULE_SERIAL_FLOPPY |
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| 39 | jnz SHORT Int13h_DirectCallToAnotherBios ; we handle all traffic for function 08h, |
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| 40 | ; as we need to wrap both hard disk and floppy drive counts |
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| 41 | %else |
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[263] | 42 | jz SHORT .OurFunction ; we handle all *hard disk* (only) traffic for function 08h, |
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[262] | 43 | ; as we need to wrap the hard disk drive count |
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| 44 | test dl, dl |
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| 45 | jns SHORT Int13h_DirectCallToAnotherBios |
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| 46 | %endif |
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| 47 | |
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| 48 | .OurFunction: |
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[3] | 49 | ; Jump to correct BIOS function |
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[148] | 50 | eMOVZX bx, ah |
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| 51 | shl bx, 1 |
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[165] | 52 | cmp ah, 25h ; Possible EBIOS function? |
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[176] | 53 | %ifdef MODULE_EBIOS |
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[165] | 54 | ja SHORT .JumpToEbiosFunction |
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[176] | 55 | %else |
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| 56 | ja SHORT Int13h_UnsupportedFunction |
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| 57 | %endif |
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[148] | 58 | jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function |
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[3] | 59 | |
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[176] | 60 | %ifdef MODULE_EBIOS |
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[165] | 61 | ; Jump to correct EBIOS function |
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| 62 | ALIGN JUMP_ALIGN |
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| 63 | .JumpToEbiosFunction: |
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[167] | 64 | test BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA |
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| 65 | jz SHORT Int13h_UnsupportedFunction ; No eINT 13h for CHS drives |
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| 66 | cmp ah, 48h |
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[165] | 67 | ja SHORT Int13h_UnsupportedFunction |
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[181] | 68 | sub bl, 41h<<1 ; BX = Offset to eINT 13h jump table |
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| 69 | jb SHORT Int13h_UnsupportedFunction |
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[165] | 70 | jmp [cs:bx+g_rgwEbiosFunctionJumpTable] |
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[176] | 71 | %endif |
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[3] | 72 | |
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[260] | 73 | |
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[3] | 74 | ;-------------------------------------------------------------------- |
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[148] | 75 | ; Int13h_UnsupportedFunction |
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[3] | 76 | ; Int13h_DirectCallToAnotherBios |
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| 77 | ; Parameters: |
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[148] | 78 | ; DL: Translated drive number |
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[3] | 79 | ; DS: RAMVARS segment |
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[150] | 80 | ; SS:BP: Ptr to IDEPACK |
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[148] | 81 | ; BX, DI: Corrupted on Int13h_DiskFunctionsHandler |
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[161] | 82 | ; Other: Function specific INT 13h parameters |
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[3] | 83 | ; Returns: |
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| 84 | ; Depends on function |
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| 85 | ; Corrupts registers: |
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| 86 | ; Flags |
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| 87 | ;-------------------------------------------------------------------- |
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| 88 | ALIGN JUMP_ALIGN |
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| 89 | Int13h_UnsupportedFunction: |
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| 90 | Int13h_DirectCallToAnotherBios: |
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[148] | 91 | call ExchangeCurrentInt13hHandlerWithOldInt13hHandler |
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[150] | 92 | mov bx, [bp+IDEPACK.intpack+INTPACK.bx] |
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| 93 | mov di, [bp+IDEPACK.intpack+INTPACK.di] |
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| 94 | mov ds, [bp+IDEPACK.intpack+INTPACK.ds] |
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| 95 | push WORD [bp+IDEPACK.intpack+INTPACK.flags] |
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[148] | 96 | popf |
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| 97 | push bp |
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[150] | 98 | mov bp, [bp+IDEPACK.intpack+INTPACK.bp] |
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[148] | 99 | int BIOS_DISK_INTERRUPT_13h ; Can safely do as much recursion as it wants |
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[3] | 100 | |
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[148] | 101 | ; Store returned values to INTPACK |
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| 102 | pop bp ; Standard INT 13h functions never uses BP as return register |
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| 103 | %ifdef USE_386 |
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[150] | 104 | mov [bp+IDEPACK.intpack+INTPACK.gs], gs |
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| 105 | mov [bp+IDEPACK.intpack+INTPACK.fs], fs |
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[148] | 106 | %endif |
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[150] | 107 | mov [bp+IDEPACK.intpack+INTPACK.es], es |
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| 108 | mov [bp+IDEPACK.intpack+INTPACK.ds], ds |
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| 109 | mov [bp+IDEPACK.intpack+INTPACK.di], di |
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| 110 | mov [bp+IDEPACK.intpack+INTPACK.si], si |
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| 111 | mov [bp+IDEPACK.intpack+INTPACK.bx], bx |
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| 112 | mov [bp+IDEPACK.intpack+INTPACK.dh], dh |
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| 113 | mov [bp+IDEPACK.intpack+INTPACK.cx], cx |
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| 114 | mov [bp+IDEPACK.intpack+INTPACK.ax], ax |
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[148] | 115 | pushf |
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[150] | 116 | pop WORD [bp+IDEPACK.intpack+INTPACK.flags] |
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[148] | 117 | call RamVars_GetSegmentToDS |
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| 118 | cmp dl, [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv] |
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| 119 | je SHORT .ExchangeInt13hHandlers |
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[150] | 120 | mov [bp+IDEPACK.intpack+INTPACK.dl], dl ; Something is returned in DL |
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[148] | 121 | ALIGN JUMP_ALIGN |
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| 122 | .ExchangeInt13hHandlers: |
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[249] | 123 | %ifdef USE_186 |
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| 124 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 125 | jmp SHORT ExchangeCurrentInt13hHandlerWithOldInt13hHandler |
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| 126 | %else |
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[148] | 127 | call ExchangeCurrentInt13hHandlerWithOldInt13hHandler |
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[249] | 128 | jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 129 | %endif |
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[3] | 130 | |
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[260] | 131 | %ifdef MODULE_SERIAL_FLOPPY |
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| 132 | ;-------------------------------------------------------------------- |
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| 133 | ; Int13h_ReturnSuccessForFloppy |
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| 134 | ; |
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| 135 | ; Some operations, such as format of a floppy disk track, should just |
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| 136 | ; return success, while for hard disks it should be treated as unsupported. |
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| 137 | ;-------------------------------------------------------------------- |
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| 138 | ALIGN JUMP_ALIGN |
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| 139 | Int13h_ReturnSuccessForFloppy: |
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| 140 | test dl, dl |
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| 141 | js short Int13h_UnsupportedFunction |
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| 142 | mov ah, 0 |
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| 143 | jmp short Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 144 | %endif |
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[3] | 145 | |
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| 146 | ;-------------------------------------------------------------------- |
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[249] | 147 | ; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL |
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| 148 | ; Parameters: |
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| 149 | ; AH: BIOS Error code |
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| 150 | ; CL: Number of sectors actually transferred |
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| 151 | ; SS:BP: Ptr to IDEPACK |
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| 152 | ; Returns: |
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| 153 | ; All registers are loaded from INTPACK |
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| 154 | ;-------------------------------------------------------------------- |
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| 155 | ALIGN JUMP_ALIGN |
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| 156 | Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL: |
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| 157 | mov [bp+IDEPACK.intpack+INTPACK.al], cl |
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| 158 | ; Fall to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 159 | |
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| 160 | ;-------------------------------------------------------------------- |
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[148] | 161 | ; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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| 162 | ; Int13h_ReturnFromHandlerWithoutStoringErrorCode |
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[32] | 163 | ; Parameters: |
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[148] | 164 | ; AH: BIOS Error code |
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[150] | 165 | ; SS:BP: Ptr to IDEPACK |
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[32] | 166 | ; Returns: |
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[148] | 167 | ; All registers are loaded from INTPACK |
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[32] | 168 | ;-------------------------------------------------------------------- |
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| 169 | ALIGN JUMP_ALIGN |
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[148] | 170 | Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH: |
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[258] | 171 | %ifdef MODULE_SERIAL_FLOPPY |
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| 172 | mov al, [bp+IDEPACK.intpack+INTPACK.dl] |
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| 173 | Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH_ALHasDriveNumber: |
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| 174 | call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber |
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| 175 | %else |
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[150] | 176 | call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH |
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[258] | 177 | %endif |
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[148] | 178 | Int13h_ReturnFromHandlerWithoutStoringErrorCode: |
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[150] | 179 | or WORD [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_IF ; Return with interrupts enabled |
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[148] | 180 | mov sp, bp ; Now we can exit anytime |
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[155] | 181 | RESTORE_FRAME_INTPACK_FROM_SSBP EXTRA_BYTES_FOR_INTPACK |
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[32] | 182 | |
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| 183 | |
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| 184 | ;-------------------------------------------------------------------- |
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[148] | 185 | ; Int13h_CallPreviousInt13hHandler |
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[3] | 186 | ; Parameters: |
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[148] | 187 | ; AH: INT 13h function to call |
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| 188 | ; DL: Drive number |
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| 189 | ; DS: RAMVARS segment |
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[3] | 190 | ; Returns: |
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| 191 | ; Depends on function |
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[258] | 192 | ; NOTE: ES:DI needs to be returned from the previous interrupt |
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| 193 | ; handler, for floppy DPT in function 08h |
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[3] | 194 | ; Corrupts registers: |
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[258] | 195 | ; None |
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[3] | 196 | ;-------------------------------------------------------------------- |
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| 197 | ALIGN JUMP_ALIGN |
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[148] | 198 | Int13h_CallPreviousInt13hHandler: |
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| 199 | call ExchangeCurrentInt13hHandlerWithOldInt13hHandler |
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| 200 | int BIOS_DISK_INTERRUPT_13h |
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[258] | 201 | ;;; fall-through to ExchangeCurrentInt13hHandlerWithOldInt13hHandler |
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[35] | 202 | |
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[3] | 203 | ;-------------------------------------------------------------------- |
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[148] | 204 | ; ExchangeCurrentInt13hHandlerWithOldInt13hHandler |
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[3] | 205 | ; Parameters: |
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| 206 | ; DS: RAMVARS segment |
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| 207 | ; Returns: |
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[148] | 208 | ; Nothing |
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[3] | 209 | ; Corrupts registers: |
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[258] | 210 | ; Nothing |
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| 211 | ; Note: Flags are preserved |
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[3] | 212 | ;-------------------------------------------------------------------- |
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| 213 | ALIGN JUMP_ALIGN |
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[148] | 214 | ExchangeCurrentInt13hHandlerWithOldInt13hHandler: |
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| 215 | push es |
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[258] | 216 | push si |
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| 217 | LOAD_BDA_SEGMENT_PRESERVE_FLAGS_TO es, si |
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| 218 | mov si, [RAMVARS.fpOldI13h] |
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[150] | 219 | cli |
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[258] | 220 | xchg si, [es:BIOS_DISK_INTERRUPT_13h*4] |
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| 221 | mov [RAMVARS.fpOldI13h], si |
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| 222 | mov si, [RAMVARS.fpOldI13h+2] |
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| 223 | xchg si, [es:BIOS_DISK_INTERRUPT_13h*4+2] |
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[181] | 224 | sti |
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[258] | 225 | mov [RAMVARS.fpOldI13h+2], si |
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| 226 | pop si |
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[148] | 227 | pop es |
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| 228 | ret |
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[28] | 229 | |
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[35] | 230 | |
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[150] | 231 | ;-------------------------------------------------------------------- |
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| 232 | ; Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH |
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| 233 | ; Int13h_SetErrorCodeToIntpackInSSBPfromAH |
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| 234 | ; Parameters: |
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| 235 | ; AH: BIOS error code (00h = no error) |
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| 236 | ; SS:BP: Ptr to IDEPACK |
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| 237 | ; Returns: |
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| 238 | ; SS:BP: Ptr to IDEPACK with error condition set |
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| 239 | ; Corrupts registers: |
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| 240 | ; DS, DI |
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| 241 | ;-------------------------------------------------------------------- |
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| 242 | ALIGN JUMP_ALIGN |
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[258] | 243 | %ifdef MODULE_SERIAL_FLOPPY |
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| 244 | Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber: |
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| 245 | ; Store error code to BDA |
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| 246 | mov bx, BDA.bHDLastSt |
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| 247 | test al, al |
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| 248 | js .HardDisk |
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| 249 | mov bl, BDA.bFDRetST & 0xff |
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| 250 | .HardDisk: |
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| 251 | LOAD_BDA_SEGMENT_TO ds, di |
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| 252 | mov [bx], ah |
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| 253 | %else |
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[150] | 254 | Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH: |
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| 255 | ; Store error code to BDA |
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[258] | 256 | LOAD_BDA_SEGMENT_TO ds, di |
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[150] | 257 | mov [BDA.bHDLastSt], ah |
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[258] | 258 | %endif |
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[35] | 259 | |
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[150] | 260 | ; Store error code to INTPACK |
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| 261 | Int13h_SetErrorCodeToIntpackInSSBPfromAH: |
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| 262 | mov [bp+IDEPACK.intpack+INTPACK.ah], ah |
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| 263 | test ah, ah |
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| 264 | jnz SHORT .SetCFtoIntpack |
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| 265 | and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF |
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| 266 | ret |
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| 267 | .SetCFtoIntpack: |
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| 268 | or BYTE [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_CF |
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| 269 | ret |
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| 270 | |
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| 271 | |
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[3] | 272 | ; Jump table for correct BIOS function |
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| 273 | ALIGN WORD_ALIGN |
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| 274 | g_rgw13hFuncJump: |
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| 275 | dw AH0h_HandlerForDiskControllerReset ; 00h, Disk Controller Reset (All) |
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| 276 | dw AH1h_HandlerForReadDiskStatus ; 01h, Read Disk Status (All) |
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| 277 | dw AH2h_HandlerForReadDiskSectors ; 02h, Read Disk Sectors (All) |
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| 278 | dw AH3h_HandlerForWriteDiskSectors ; 03h, Write Disk Sectors (All) |
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| 279 | dw AH4h_HandlerForVerifyDiskSectors ; 04h, Verify Disk Sectors (All) |
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[260] | 280 | %ifdef MODULE_SERIAL_FLOPPY |
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| 281 | dw Int13h_ReturnSuccessForFloppy ; 05h, Format Disk Track (XT, AT, EISA) |
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| 282 | %else |
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[90] | 283 | dw Int13h_UnsupportedFunction ; 05h, Format Disk Track (XT, AT, EISA) |
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[260] | 284 | %endif |
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[3] | 285 | dw Int13h_UnsupportedFunction ; 06h, Format Disk Track with Bad Sectors (XT) |
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| 286 | dw Int13h_UnsupportedFunction ; 07h, Format Multiple Cylinders (XT) |
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| 287 | dw AH8h_HandlerForReadDiskDriveParameters ; 08h, Read Disk Drive Parameters (All) |
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| 288 | dw AH9h_HandlerForInitializeDriveParameters ; 09h, Initialize Drive Parameters (All) |
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| 289 | dw Int13h_UnsupportedFunction ; 0Ah, Read Disk Sectors with ECC (XT, AT, EISA) |
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| 290 | dw Int13h_UnsupportedFunction ; 0Bh, Write Disk Sectors with ECC (XT, AT, EISA) |
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| 291 | dw AHCh_HandlerForSeek ; 0Ch, Seek (All) |
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| 292 | dw AHDh_HandlerForResetHardDisk ; 0Dh, Alternate Disk Reset (All) |
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| 293 | dw Int13h_UnsupportedFunction ; 0Eh, Read Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2) |
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| 294 | dw Int13h_UnsupportedFunction ; 0Fh, Write Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2) |
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| 295 | dw AH10h_HandlerForCheckDriveReady ; 10h, Check Drive Ready (All) |
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| 296 | dw AH11h_HandlerForRecalibrate ; 11h, Recalibrate (All) |
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| 297 | dw Int13h_UnsupportedFunction ; 12h, Controller RAM Diagnostic (XT) |
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| 298 | dw Int13h_UnsupportedFunction ; 13h, Drive Diagnostic (XT) |
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[90] | 299 | dw Int13h_UnsupportedFunction ; 14h, Controller Internal Diagnostic (All) |
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[3] | 300 | dw AH15h_HandlerForReadDiskDriveSize ; 15h, Read Disk Drive Size (AT+) |
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[161] | 301 | dw Int13h_UnsupportedFunction ; 16h, |
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| 302 | dw Int13h_UnsupportedFunction ; 17h, |
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| 303 | dw Int13h_UnsupportedFunction ; 18h, |
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[3] | 304 | dw Int13h_UnsupportedFunction ; 19h, Park Heads (PS/2) |
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| 305 | dw Int13h_UnsupportedFunction ; 1Ah, Format ESDI Drive (PS/2) |
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| 306 | dw Int13h_UnsupportedFunction ; 1Bh, Get ESDI Manufacturing Header (PS/2) |
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| 307 | dw Int13h_UnsupportedFunction ; 1Ch, ESDI Special Functions (PS/2) |
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[161] | 308 | dw Int13h_UnsupportedFunction ; 1Dh, |
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| 309 | dw Int13h_UnsupportedFunction ; 1Eh, |
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| 310 | dw Int13h_UnsupportedFunction ; 1Fh, |
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| 311 | dw Int13h_UnsupportedFunction ; 20h, |
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[3] | 312 | dw Int13h_UnsupportedFunction ; 21h, Read Disk Sectors, Multiple Blocks (PS/1) |
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| 313 | dw Int13h_UnsupportedFunction ; 22h, Write Disk Sectors, Multiple Blocks (PS/1) |
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| 314 | dw AH23h_HandlerForSetControllerFeatures ; 23h, Set Controller Features Register (PS/1) |
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| 315 | dw AH24h_HandlerForSetMultipleBlocks ; 24h, Set Multiple Blocks (PS/1) |
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| 316 | dw AH25h_HandlerForGetDriveInformation ; 25h, Get Drive Information (PS/1) |
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[165] | 317 | |
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[176] | 318 | %ifdef MODULE_EBIOS |
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[165] | 319 | g_rgwEbiosFunctionJumpTable: |
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| 320 | dw AH41h_HandlerForCheckIfExtensionsPresent ; 41h, Check if Extensions Present (EBIOS)* |
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| 321 | dw AH42h_HandlerForExtendedReadSectors ; 42h, Extended Read Sectors (EBIOS)* |
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| 322 | dw AH43h_HandlerForExtendedWriteSectors ; 43h, Extended Write Sectors (EBIOS)* |
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| 323 | dw AH44h_HandlerForExtendedVerifySectors ; 44h, Extended Verify Sectors (EBIOS)* |
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| 324 | dw Int13h_UnsupportedFunction ; 45h, Lock and Unlock Drive (EBIOS)*** |
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| 325 | dw Int13h_UnsupportedFunction ; 46h, Eject Media Request (EBIOS)*** |
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| 326 | dw AH47h_HandlerForExtendedSeek ; 47h, Extended Seek (EBIOS)* |
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| 327 | dw AH48h_HandlerForGetExtendedDriveParameters ; 48h, Get Extended Drive Parameters (EBIOS)* |
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[150] | 328 | ; dw Int13h_UnsupportedFunction ; 49h, Get Extended Disk Change Status (EBIOS)*** |
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[3] | 329 | ; dw Int13h_UnsupportedFunction ; 4Ah, Initiate Disk Emulation (Bootable CD-ROM) |
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| 330 | ; dw Int13h_UnsupportedFunction ; 4Bh, Terminate Disk Emulation (Bootable CD-ROM) |
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| 331 | ; dw Int13h_UnsupportedFunction ; 4Ch, Initiate Disk Emulation and Boot (Bootable CD-ROM) |
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| 332 | ; dw Int13h_UnsupportedFunction ; 4Dh, Return Boot Catalog (Bootable CD-ROM) |
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[150] | 333 | ; dw Int13h_UnsupportedFunction ; 4Eh, Set Hardware Configuration (EBIOS)** |
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| 334 | ; |
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| 335 | ; * = Enhanced Drive Access Support (minimum required EBIOS functions) |
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| 336 | ; ** = Enhanced Disk Drive (EDD) Support |
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| 337 | ; *** = Drive Locking and Ejecting Support |
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[181] | 338 | %endif |
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