[41] | 1 | ; Project name : Assembly Library |
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| 2 | ; Description : Functions for size calculations. |
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| 3 | |
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[376] | 4 | ; |
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| 5 | ; XTIDE Universal BIOS and Associated Tools |
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
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| 7 | ; |
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| 8 | ; This program is free software; you can redistribute it and/or modify |
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| 9 | ; it under the terms of the GNU General Public License as published by |
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| 10 | ; the Free Software Foundation; either version 2 of the License, or |
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| 11 | ; (at your option) any later version. |
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| 12 | ; |
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| 13 | ; This program is distributed in the hope that it will be useful, |
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | ; GNU General Public License for more details. |
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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| 18 | ; |
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| 19 | |
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[85] | 20 | struc BYTE_MULTIPLES |
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| 21 | .B resb 1 |
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| 22 | .kiB resb 1 |
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| 23 | .MiB resb 1 |
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| 24 | .GiB resb 1 |
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| 25 | .TiB resb 1 |
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| 26 | endstruc |
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| 27 | |
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[41] | 28 | ; Section containing code |
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| 29 | SECTION .text |
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| 30 | |
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| 31 | ;-------------------------------------------------------------------- |
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[85] | 32 | ; Size_GetSizeToAXAndCharToDLfromBXDXAXwithMagnitudeInCX |
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[41] | 33 | ; Parameters: |
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| 34 | ; BX:DX:AX: Size in magnitude |
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[85] | 35 | ; CX: Magnitude in BYTE_MULTIPLES |
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[41] | 36 | ; Returns: |
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| 37 | ; AX: Size in magnitude |
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| 38 | ; CX: Tenths |
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| 39 | ; DL: Magnitude character: |
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| 40 | ; 'k' = *1024 B = kiB |
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| 41 | ; 'M' = *1024 kiB = MiB |
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| 42 | ; 'G' = *1024 MiB = GiB |
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| 43 | ; 'T' = *1024 GiB = TiB |
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| 44 | ; 'P' = *1024 TiB = PiB |
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| 45 | ; Corrupts registers: |
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| 46 | ; BX, DH |
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| 47 | ;-------------------------------------------------------------------- |
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[369] | 48 | ALIGN UTIL_SIZE_JUMP_ALIGN |
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[41] | 49 | Size_GetSizeToAXAndCharToDLfromBXDXAXwithMagnitudeInCX: |
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[142] | 50 | %ifndef USE_186 ; If 8086/8088 |
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| 51 | push di |
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| 52 | %endif |
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[41] | 53 | push si |
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| 54 | |
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[369] | 55 | ALIGN UTIL_SIZE_JUMP_ALIGN |
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[41] | 56 | .MagnitudeConversionLoop: |
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[142] | 57 | ePUSH_T di, .MagnitudeConversionLoop; DI corrupted only on 8086/8088 build |
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| 58 | test bx, bx ; Bits 32...47 in use? |
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[41] | 59 | jnz SHORT Size_DivideSizeInBXDXAXby1024andIncrementMagnitudeInCX |
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[142] | 60 | test dx, dx ; Bits 16...31 in use? |
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[41] | 61 | jnz SHORT Size_DivideSizeInBXDXAXby1024andIncrementMagnitudeInCX |
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[142] | 62 | cmp ax, 10000 ; 5 digits needed? |
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[41] | 63 | jae SHORT Size_DivideSizeInBXDXAXby1024andIncrementMagnitudeInCX |
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[142] | 64 | add sp, BYTE 2 ; Clean return address from stack |
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| 65 | xchg si, cx ; CX = Remainder (0...1023), SI = Magnitude |
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[41] | 66 | |
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[141] | 67 | ; Convert remainder to tenths |
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[142] | 68 | xchg bx, ax ; Store AX |
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[141] | 69 | mov ax, 10 |
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[142] | 70 | mul cx ; DX:AX = remainder * 10 |
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| 71 | eSHR_IM ax, 10 ; Divide AX by 1024 |
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| 72 | xchg cx, ax ; CX = tenths |
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[141] | 73 | xchg ax, bx |
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| 74 | |
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| 75 | ; Convert magnitude to character |
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| 76 | mov dl, [cs:si+.rgbMagnitudeToChar] |
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| 77 | |
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[41] | 78 | pop si |
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[142] | 79 | %ifndef USE_186 |
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| 80 | pop di |
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| 81 | %endif |
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[41] | 82 | ret |
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[141] | 83 | .rgbMagnitudeToChar: db " kMGTP" |
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[41] | 84 | |
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[141] | 85 | |
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[41] | 86 | ;-------------------------------------------------------------------- |
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| 87 | ; Size_DivideSizeInBXDXAXby1024andIncrementMagnitudeInCX |
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| 88 | ; Parameters: |
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| 89 | ; BX:DX:AX: Size |
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[85] | 90 | ; CX: Magnitude in BYTE_MULTIPLES |
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[41] | 91 | ; Returns: |
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| 92 | ; BX:DX:AX: Size in magnitude |
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| 93 | ; SI: Remainder (0...1023) |
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[85] | 94 | ; CX: Magnitude in BYTE_MULTIPLES |
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[41] | 95 | ; Corrupts registers: |
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| 96 | ; Nothing |
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| 97 | ;-------------------------------------------------------------------- |
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[369] | 98 | ALIGN UTIL_SIZE_JUMP_ALIGN |
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[41] | 99 | Size_DivideSizeInBXDXAXby1024andIncrementMagnitudeInCX: |
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| 100 | push cx |
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| 101 | xor si, si ; Zero remainder |
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| 102 | mov cl, 10 ; Divide by 1024 |
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[369] | 103 | ALIGN UTIL_SIZE_JUMP_ALIGN |
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[41] | 104 | .ShiftLoop: |
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| 105 | call Size_DivideBXDXAXbyTwo |
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| 106 | rcr si, 1 ; Update remainder |
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| 107 | loop .ShiftLoop |
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| 108 | eSHR_IM si, 6 ; Remainder to SI beginning |
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| 109 | pop cx |
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| 110 | inc cx ; Increment magnitude |
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| 111 | ret |
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| 112 | |
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| 113 | |
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| 114 | ;-------------------------------------------------------------------- |
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| 115 | ; Size_ConvertSectorCountInBXDXAXtoKiB |
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| 116 | ; Size_DivideBXDXAXbyTwo |
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| 117 | ; Parameters: |
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| 118 | ; BX:DX:AX: Total sector count |
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| 119 | ; Returns: |
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| 120 | ; BX:DX:AX: Total size in kiB |
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| 121 | ; CF: Remainder from division |
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| 122 | ; Corrupts registers: |
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| 123 | ; Nothing |
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| 124 | ;-------------------------------------------------------------------- |
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[369] | 125 | ALIGN UTIL_SIZE_JUMP_ALIGN |
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[41] | 126 | Size_ConvertSectorCountInBXDXAXtoKiB: |
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| 127 | Size_DivideBXDXAXbyTwo: |
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| 128 | shr bx, 1 ; Divide sector count by 2... |
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| 129 | rcr dx, 1 ; ...to get disk size in... |
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| 130 | rcr ax, 1 ; ...kiB |
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| 131 | ret |
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