| 1 | ; File name : Size.asm
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| 2 | ; Project name : Assembly Library
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| 3 | ; Created date : 7.9.2010
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| 4 | ; Last update : 15.9.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for size calculations.
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| 7 |
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| 8 | ; Section containing code
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| 9 | SECTION .text
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| 10 |
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| 11 | ;--------------------------------------------------------------------
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| 12 | ; Size_GetWordSizeToAXfromBXDXAXwithMagnitudeInCX
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| 13 | ; Parameters:
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| 14 | ; BX:DX:AX: Size in magnitude
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| 15 | ; CX: Magnitude (0=B, 1=kiB, 2=MiB...)
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| 16 | ; Returns:
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| 17 | ; AX: Size in magnitude
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| 18 | ; CX: Tenths
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| 19 | ; DL: Magnitude character:
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| 20 | ; 'k' = *1024 B = kiB
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| 21 | ; 'M' = *1024 kiB = MiB
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| 22 | ; 'G' = *1024 MiB = GiB
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| 23 | ; 'T' = *1024 GiB = TiB
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| 24 | ; 'P' = *1024 TiB = PiB
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| 25 | ; Corrupts registers:
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| 26 | ; BX, DH
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| 27 | ;--------------------------------------------------------------------
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| 28 | ALIGN JUMP_ALIGN
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| 29 | Size_GetSizeToAXAndCharToDLfromBXDXAXwithMagnitudeInCX:
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| 30 | push si
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| 31 |
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| 32 | ALIGN JUMP_ALIGN
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| 33 | .MagnitudeConversionLoop:
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| 34 | ePUSH_T si, .MagnitudeConversionLoop
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| 35 | test bx, bx ; Bits 32...47 in use?
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| 36 | jnz SHORT Size_DivideSizeInBXDXAXby1024andIncrementMagnitudeInCX
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| 37 | test dx, dx ; Bits 16...31 in use?
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| 38 | jnz SHORT Size_DivideSizeInBXDXAXby1024andIncrementMagnitudeInCX
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| 39 | cmp ax, 10000 ; 5 digits needed?
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| 40 | jae SHORT Size_DivideSizeInBXDXAXby1024andIncrementMagnitudeInCX
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| 41 |
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| 42 | add sp, BYTE 2 ; Clean return address from stack
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| 43 | call Size_ConvertMagnitudeRemainderInSItoTenths
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| 44 | call Size_GetMagnitudeCharacterToDLfromMagnitudeInCX
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| 45 | mov cx, si
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| 46 |
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| 47 | pop si
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| 48 | ret
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| 49 |
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| 50 | ;--------------------------------------------------------------------
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| 51 | ; Size_DivideSizeInBXDXAXby1024andIncrementMagnitudeInCX
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| 52 | ; Parameters:
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| 53 | ; BX:DX:AX: Size
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| 54 | ; CX: Magnitude (0=B, 1=kiB, 2=MiB...)
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| 55 | ; Returns:
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| 56 | ; BX:DX:AX: Size in magnitude
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| 57 | ; SI: Remainder (0...1023)
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| 58 | ; CX: Magnitude (1=kiB, 2=MiB...)
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| 59 | ; Corrupts registers:
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| 60 | ; Nothing
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| 61 | ;--------------------------------------------------------------------
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| 62 | ALIGN JUMP_ALIGN
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| 63 | Size_DivideSizeInBXDXAXby1024andIncrementMagnitudeInCX:
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| 64 | push cx
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| 65 | xor si, si ; Zero remainder
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| 66 | mov cl, 10 ; Divide by 1024
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| 67 | ALIGN JUMP_ALIGN
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| 68 | .ShiftLoop:
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| 69 | call Size_DivideBXDXAXbyTwo
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| 70 | rcr si, 1 ; Update remainder
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| 71 | loop .ShiftLoop
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| 72 | eSHR_IM si, 6 ; Remainder to SI beginning
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| 73 | pop cx
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| 74 | inc cx ; Increment magnitude
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| 75 | ret
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| 76 |
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| 77 |
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| 78 | ;--------------------------------------------------------------------
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| 79 | ; Size_ConvertSectorCountInBXDXAXtoKiB
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| 80 | ; Size_DivideBXDXAXbyTwo
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| 81 | ; Parameters:
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| 82 | ; BX:DX:AX: Total sector count
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| 83 | ; Returns:
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| 84 | ; BX:DX:AX: Total size in kiB
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| 85 | ; CF: Remainder from division
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| 86 | ; Corrupts registers:
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| 87 | ; Nothing
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| 88 | ;--------------------------------------------------------------------
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| 89 | ALIGN JUMP_ALIGN
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| 90 | Size_ConvertSectorCountInBXDXAXtoKiB:
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| 91 | Size_DivideBXDXAXbyTwo:
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| 92 | shr bx, 1 ; Divide sector count by 2...
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| 93 | rcr dx, 1 ; ...to get disk size in...
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| 94 | rcr ax, 1 ; ...kiB
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| 95 | ret
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| 96 |
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| 97 |
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| 98 | ;--------------------------------------------------------------------
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| 99 | ; Size_ConvertMagnitudeRemainderInSItoTenths
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| 100 | ; Parameters:
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| 101 | ; SI: Remainder from last magnitude division (0...1023)
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| 102 | ; Returns:
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| 103 | ; SI: Tenths
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| 104 | ; Corrupts registers:
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| 105 | ; DX
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| 106 | ;--------------------------------------------------------------------
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| 107 | ALIGN JUMP_ALIGN
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| 108 | Size_ConvertMagnitudeRemainderInSItoTenths:
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| 109 | push ax
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| 110 |
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| 111 | mov ax, 10
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| 112 | mul si ; DX:AX = remainder * 10
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| 113 | eSHR_IM ax, 10 ; Divide AX by 1024
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| 114 | xchg si, ax ; SI = tenths
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| 115 |
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| 116 | pop ax
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| 117 | ret
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| 118 |
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| 119 |
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| 120 | ;--------------------------------------------------------------------
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| 121 | ; Size_GetMagnitudeCharacterToDLfromMagnitudeInCX
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| 122 | ; Parameters:
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| 123 | ; CX: Magnitude (0=B, 1=kiB, 2=MiB...)
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| 124 | ; Returns:
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| 125 | ; DL: Magnitude character
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| 126 | ; Corrupts registers:
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| 127 | ; BX
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| 128 | ;--------------------------------------------------------------------
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| 129 | ALIGN JUMP_ALIGN
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| 130 | Size_GetMagnitudeCharacterToDLfromMagnitudeInCX:
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| 131 | mov bx, cx
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| 132 | mov dl, [cs:bx+.rgbMagnitudeToChar]
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| 133 | ret
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| 134 | ALIGN WORD_ALIGN
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| 135 | .rgbMagnitudeToChar: db " kMGTP"
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