| 1 | ; File name : Initialize.asm
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| 2 | ; Project name : IDE BIOS
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| 3 | ; Created date : 23.3.2010
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| 4 | ; Last update : 2.5.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for initializing the BIOS.
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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 | ; Initializes the BIOS.
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| 13 | ; This function is called from main BIOS ROM search routine.
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| 14 | ;
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| 15 | ; Initialize_FromMainBiosRomSearch
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| 16 | ; Parameters:
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| 17 | ; Nothing
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| 18 | ; Returns:
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| 19 | ; Nothing
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| 20 | ; Corrupts registers:
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| 21 | ; Nothing
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| 22 | ;--------------------------------------------------------------------
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| 23 | ALIGN JUMP_ALIGN
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| 24 | Initialize_FromMainBiosRomSearch:
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| 25 | pushf
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| 26 | push es
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| 27 | push ds
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| 28 | ePUSHA
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| 29 |
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| 30 | call Initialize_ShouldSkip
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| 31 | jc SHORT .ReturnFromRomInit
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| 32 |
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| 33 | ePUSH_T ax, .ReturnFromRomInit ; Push return address
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| 34 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_LATE
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| 35 | jnz SHORT Initialize_PrepareLateInitialization
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| 36 | jmp SHORT Initialize_AndDetectDrives
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| 37 |
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| 38 | ALIGN JUMP_ALIGN
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| 39 | .ReturnFromRomInit:
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| 40 | ePOPA
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| 41 | pop ds
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| 42 | pop es
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| 43 | popf
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| 44 | retf
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| 45 |
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| 46 |
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| 47 | ;--------------------------------------------------------------------
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| 48 | ; Checks if user wants to skip ROM initialization.
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| 49 | ;
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| 50 | ; Initialize_ShouldSkip
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| 51 | ; Parameters:
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| 52 | ; Nothing
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| 53 | ; Returns:
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| 54 | ; CF: Set if ROM initialization is to be skipped
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| 55 | ; Cleared to continue ROM initialization
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| 56 | ; Corrupts registers:
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| 57 | ; AX, DS
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| 58 | ;--------------------------------------------------------------------
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| 59 | ALIGN JUMP_ALIGN
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| 60 | Initialize_ShouldSkip:
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| 61 | sti ; Enable interrupts
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| 62 | LOAD_BDA_SEGMENT_TO ds, ax
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| 63 | mov al, [BDA.bKBFlgs1] ; Load shift flags
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| 64 | eSHR_IM al, 3 ; Set CF if CTRL is held down
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| 65 | ret
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| 66 |
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| 67 |
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| 68 | ;--------------------------------------------------------------------
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| 69 | ; Installs INT 19h boot loader handler for late initialization.
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| 70 | ;
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| 71 | ; Initialize_PrepareLateInitialization
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| 72 | ; Parameters:
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| 73 | ; Nothing
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| 74 | ; Returns:
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| 75 | ; Nothing
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| 76 | ; Corrupts registers:
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| 77 | ; BX, SI, ES
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| 78 | ;--------------------------------------------------------------------
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| 79 | ALIGN JUMP_ALIGN
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| 80 | Initialize_PrepareLateInitialization:
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| 81 | LOAD_BDA_SEGMENT_TO es, bx
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| 82 | mov bl, INTV_BOOTSTRAP
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| 83 | mov si, Int19h_LateInitialization
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| 84 | ; Fall to Initialize_InstallInterruptHandler
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| 85 |
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| 86 | ;--------------------------------------------------------------------
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| 87 | ; Installs any interrupt handler.
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| 88 | ;
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| 89 | ; Initialize_InstallInterruptHandler
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| 90 | ; Parameters:
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| 91 | ; BX: Interrupt vector number (for example 13h)
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| 92 | ; ES: BDA and Interrupt Vector segment (zero)
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| 93 | ; CS:SI: Ptr to interrupt handler
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| 94 | ; Returns:
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| 95 | ; Nothing
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| 96 | ; Corrupts registers:
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| 97 | ; BX
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| 98 | ;--------------------------------------------------------------------
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| 99 | ALIGN JUMP_ALIGN
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| 100 | Initialize_InstallInterruptHandler:
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| 101 | eSHL_IM bx, 2 ; Shift for DWORD offset
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| 102 | mov [es:bx], si ; Store offset
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| 103 | mov [es:bx+2], cs ; Store segment
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| 104 | ret
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| 105 |
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| 106 |
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| 107 | ;--------------------------------------------------------------------
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| 108 | ; Initializes the BIOS variables and detects IDE drives.
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| 109 | ;
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| 110 | ; Initialize_AndDetectDrives
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| 111 | ; Parameters:
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| 112 | ; Nothing
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| 113 | ; Returns:
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| 114 | ; Nothing
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| 115 | ; Corrupts registers:
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| 116 | ; All, including segments
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| 117 | ;--------------------------------------------------------------------
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| 118 | ALIGN JUMP_ALIGN
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| 119 | Initialize_AndDetectDrives:
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| 120 | call DetectPrint_RomFoundAtSegment
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| 121 | call RamVars_Initialize
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| 122 | call RamVars_GetSegmentToDS
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| 123 | LOAD_BDA_SEGMENT_TO es, ax
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| 124 | call Initialize_InterruptVectors
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| 125 | call DetectDrives_FromAllIDEControllers
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| 126 | call CompatibleDPT_CreateForDrives80hAnd81h
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| 127 | jmp Initialize_ResetDetectedDrives
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| 128 |
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| 129 |
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| 130 | ;--------------------------------------------------------------------
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| 131 | ; Initializes Interrupt Vectors.
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| 132 | ;
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| 133 | ; Initialize_InterruptVectors
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| 134 | ; Parameters:
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| 135 | ; DS: RAMVARS segment
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| 136 | ; ES: BDA and Interrupt Vector segment (zero)
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| 137 | ; Returns:
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| 138 | ; Nothing
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| 139 | ; Corrupts registers:
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| 140 | ; All except segments
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| 141 | ;--------------------------------------------------------------------
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| 142 | ALIGN JUMP_ALIGN
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| 143 | Initialize_InterruptVectors:
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| 144 | call Initialize_Int13hAnd40h
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| 145 | call Initialize_Int19h
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| 146 | jmp SHORT Initialize_HardwareIrqHandlers
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| 147 |
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| 148 |
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| 149 | ;--------------------------------------------------------------------
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| 150 | ; Initializes INT 13h and 40h handlers for Hard Disk and
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| 151 | ; Floppy Drive BIOS functions.
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| 152 | ;
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| 153 | ; Initialize_Int13hAnd40h
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| 154 | ; Parameters:
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| 155 | ; DS: RAMVARS segment
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| 156 | ; ES: BDA and Interrupt Vector segment (zero)
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| 157 | ; Returns:
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| 158 | ; Nothing
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| 159 | ; Corrupts registers:
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| 160 | ; AX, BX, CX, DX, SI, DI
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| 161 | ;--------------------------------------------------------------------
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| 162 | ALIGN JUMP_ALIGN
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| 163 | Initialize_Int13hAnd40h:
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| 164 | mov ax, [es:INTV_DISK_FUNC*4] ; Load old INT 13h offset
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| 165 | mov dx, [es:INTV_DISK_FUNC*4+2] ; Load old INT 13h segment
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| 166 | mov [RAMVARS.fpOldI13h], ax ; Store old INT 13h offset
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| 167 | mov [RAMVARS.fpOldI13h+2], dx ; Store old INT 13h segment
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| 168 | mov bx, INTV_DISK_FUNC ; INT 13h interrupt vector offset
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| 169 | mov si, Int13h_DiskFunctions ; Interrupt handler offset
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| 170 | call Initialize_InstallInterruptHandler
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| 171 |
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| 172 | ; Only store INT 13h handler to 40h if 40h is not already installed.
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| 173 | ; At least AMI BIOS for 286 stores 40h handler by itself and calls
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| 174 | ; 40h from 13h. That system locks to infinite loop if we copy 13h to 40h.
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| 175 | call FloppyDrive_IsInt40hInstalled
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| 176 | jnc SHORT Initialize_Int40h
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| 177 | ret
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| 178 |
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| 179 | ;--------------------------------------------------------------------
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| 180 | ; Initializes INT 40h handler for Floppy Drive BIOS functions.
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| 181 | ;
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| 182 | ; Initialize_Int40h
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| 183 | ; Parameters:
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| 184 | ; DX:AX: Ptr to old INT 13h handler
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| 185 | ; ES: BDA and Interrupt Vector segment (zero)
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| 186 | ; Returns:
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| 187 | ; Nothing
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| 188 | ; Corrupts registers:
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| 189 | ; Nothing
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| 190 | ;--------------------------------------------------------------------
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| 191 | ALIGN JUMP_ALIGN
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| 192 | Initialize_Int40h:
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| 193 | mov [es:INTV_FLOPPY_FUNC*4], ax ; Store offset
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| 194 | mov [es:INTV_FLOPPY_FUNC*4+2], dx ; Store segment
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| 195 | ret
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| 196 |
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| 197 |
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| 198 | ;--------------------------------------------------------------------
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| 199 | ; Initializes INT 19h handler for boot loader.
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| 200 | ;
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| 201 | ; Initialize_Int19h
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| 202 | ; Parameters:
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| 203 | ; DS: RAMVARS segment
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| 204 | ; ES: BDA and Interrupt Vector segment (zero)
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| 205 | ; Returns:
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| 206 | ; Nothing
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| 207 | ; Corrupts registers:
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| 208 | ; BX, SI
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| 209 | ;--------------------------------------------------------------------
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| 210 | ALIGN JUMP_ALIGN
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| 211 | Initialize_Int19h:
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| 212 | eMOVZX bx, [cs:ROMVARS.bBootLdrType] ; Load boot loader type
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| 213 | mov si, INTV_BOOTSTRAP ; 19h
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| 214 | xchg bx, si ; SI=Loader type, BX=19h
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| 215 | jmp [cs:si+.rgwSetupBootLoader] ; Jump to install selected loader
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| 216 | ALIGN WORD_ALIGN
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| 217 | .rgwSetupBootLoader:
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| 218 | dw .SetupBootMenuLoader ; BOOTLOADER_TYPE_MENU
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| 219 | dw .SetupSimpleLoader ; BOOTLOADER_TYPE_SIMPLE
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| 220 | dw .SetupBootMenuLoader ; reserved
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| 221 | dw .NoBootLoader ; BOOTLOADER_TYPE_NONE
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| 222 |
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| 223 | ALIGN JUMP_ALIGN
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| 224 | .NoBootLoader:
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| 225 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_LATE
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| 226 | jnz SHORT .SetupSimpleLoader ; Boot loader required for late initialization
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| 227 | ret
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| 228 | ALIGN JUMP_ALIGN
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| 229 | .SetupSimpleLoader:
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| 230 | mov si, Int19h_SimpleBootLoader
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| 231 | jmp Initialize_InstallInterruptHandler
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| 232 | ALIGN JUMP_ALIGN
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| 233 | .SetupBootMenuLoader:
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| 234 | mov si, Int19hMenu_BootLoader
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| 235 | jmp Initialize_InstallInterruptHandler
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| 236 |
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| 237 |
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| 238 | ;--------------------------------------------------------------------
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| 239 | ; Initializes hardware IRQ handlers.
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| 240 | ;
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| 241 | ; Initialize_HardwareIrqHandlers
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| 242 | ; Parameters:
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| 243 | ; ES: BDA and Interrupt Vector segment (zero)
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| 244 | ; Returns:
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| 245 | ; Nothing
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| 246 | ; Corrupts registers:
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| 247 | ; AX, BX, CX, DX, SI, DI
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| 248 | ;--------------------------------------------------------------------
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| 249 | ALIGN JUMP_ALIGN
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| 250 | Initialize_HardwareIrqHandlers:
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| 251 | mov di, ROMVARS.ideVars0 ; CS:SI points to first IDEVARS
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| 252 | call Initialize_GetIdeControllerCountToCX
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| 253 | ALIGN JUMP_ALIGN
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| 254 | .IdeControllerLoop:
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| 255 | mov al, [cs:di+IDEVARS.bIRQ] ; Load IRQ number
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| 256 | add di, BYTE IDEVARS_size ; Increment to next controller
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| 257 | call Initialize_LowOrHighIrqHandler
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| 258 | loop .IdeControllerLoop
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| 259 | ret
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| 260 |
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| 261 | ;--------------------------------------------------------------------
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| 262 | ; Returns number of IDE controllers handled by our BIOS.
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| 263 | ;
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| 264 | ; Initialize_GetIdeControllerCountToCX
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| 265 | ; Parameters:
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| 266 | ; Nothing
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| 267 | ; Returns:
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| 268 | ; CX: Number of IDE controllers to handle
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| 269 | ; Corrupts registers:
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| 270 | ; Nothing
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| 271 | ;--------------------------------------------------------------------
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| 272 | ALIGN JUMP_ALIGN
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| 273 | Initialize_GetIdeControllerCountToCX:
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| 274 | mov cx, 1 ; Assume lite mode (one controller)
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| 275 | test BYTE [cs:ROMVARS.wFlags], FLG_ROMVARS_FULLMODE
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| 276 | jz SHORT .Return
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| 277 | mov cl, [cs:ROMVARS.bIdeCnt]
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| 278 | ALIGN JUMP_ALIGN
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| 279 | .Return:
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| 280 | ret
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| 281 |
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| 282 | ;--------------------------------------------------------------------
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| 283 | ; Initializes hardware IRQ handler for specific IRQ.
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| 284 | ;
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| 285 | ; Initialize_LowOrHighIrqHandler
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| 286 | ; Parameters:
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| 287 | ; AL: IRQ number, 0 if IRQ disabled
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| 288 | ; ES: BDA and Interrupt Vector segment (zero)
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| 289 | ; Returns:
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| 290 | ; Nothing
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| 291 | ; Corrupts registers:
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| 292 | ; AX, BX, DX, SI
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| 293 | ;--------------------------------------------------------------------
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| 294 | ALIGN JUMP_ALIGN
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| 295 | Initialize_LowOrHighIrqHandler:
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| 296 | test al, al ; IRQ disabled?
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| 297 | jz SHORT .Return ; If so, return
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| 298 | eMOVZX bx, al ; Copy IRQ number to BX
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| 299 | cmp al, 8 ; High IRQ? (AT systems only)
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| 300 | jae SHORT Initialize_HighIrqHandler
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| 301 | jmp SHORT Initialize_LowIrqHandler
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| 302 | ALIGN JUMP_ALIGN
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| 303 | .Return:
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| 304 | ret
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| 305 |
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| 306 |
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| 307 | ;--------------------------------------------------------------------
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| 308 | ; Initializes handler for high IRQ (8...15).
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| 309 | ;
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| 310 | ; Initialize_HighIrqHandler
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| 311 | ; Parameters:
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| 312 | ; AL,BX: IRQ number (8...15)
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| 313 | ; ES: BDA and Interrupt Vector segment (zero)
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| 314 | ; Returns:
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| 315 | ; Nothing
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| 316 | ; Corrupts registers:
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| 317 | ; AX, BX, DX, SI
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| 318 | ;--------------------------------------------------------------------
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| 319 | ALIGN JUMP_ALIGN
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| 320 | Initialize_HighIrqHandler:
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| 321 | add bx, BYTE INTV_IRQ8 - 8 ; Interrupt vector number
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| 322 | mov si, HIRQ_InterruptServiceRoutineForIrqs8to15
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| 323 | call Initialize_InstallInterruptHandler
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| 324 | ; Fall to Initialize_UnmaskHighIrqController
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| 325 |
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| 326 | ;--------------------------------------------------------------------
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| 327 | ; Unmasks interrupt from Slave 8259 interrupt controller (IRQs 8...15)
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| 328 | ;
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| 329 | ; Initialize_HighIrqHandler
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| 330 | ; Parameters:
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| 331 | ; AL: IRQ number (8...15)
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| 332 | ; Returns:
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| 333 | ; Nothing
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| 334 | ; Corrupts registers:
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| 335 | ; AX, DX
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| 336 | ;--------------------------------------------------------------------
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| 337 | ALIGN JUMP_ALIGN
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| 338 | Initialize_UnmaskHighIrqController:
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| 339 | sub al, 8 ; Slave interrupt number
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| 340 | mov dx, PORT_8259SL_IMR ; Load Slave Mask Register address
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| 341 | call Initialize_ClearBitFrom8259MaskRegister
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| 342 | mov al, 2 ; Master IRQ 2 to allow slave IRQs
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| 343 | jmp SHORT Initialize_UnmaskLowIrqController
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| 344 |
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| 345 |
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| 346 | ;--------------------------------------------------------------------
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| 347 | ; Initializes handler for low IRQ (0...7).
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| 348 | ;
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| 349 | ; Initialize_LowIrqHandler
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| 350 | ; Parameters:
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| 351 | ; AL,BX: IRQ number (0...7)
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| 352 | ; ES: BDA and Interrupt Vector segment (zero)
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| 353 | ; Returns:
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| 354 | ; Nothing
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| 355 | ; Corrupts registers:
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| 356 | ; AX, BX, DX, SI
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| 357 | ;--------------------------------------------------------------------
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| 358 | ALIGN JUMP_ALIGN
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| 359 | Initialize_LowIrqHandler:
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| 360 | add bx, BYTE INTV_IRQ0 ; Interrupt vector number
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| 361 | mov si, HIRQ_InterruptServiceRoutineForIrqs2to7
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| 362 | call Initialize_InstallInterruptHandler
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| 363 | ; Fall to Initialize_UnmaskLowIrqController
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| 364 |
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| 365 | ;--------------------------------------------------------------------
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| 366 | ; Unmasks interrupt from Master 8259 interrupt controller (IRQs 0...7)
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| 367 | ;
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| 368 | ; Initialize_UnmaskLowIrqController
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| 369 | ; Parameters:
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| 370 | ; AL: IRQ number (0...7)
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| 371 | ; Returns:
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| 372 | ; Nothing
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| 373 | ; Corrupts registers:
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| 374 | ; AX, DX
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| 375 | ;--------------------------------------------------------------------
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| 376 | ALIGN JUMP_ALIGN
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| 377 | Initialize_UnmaskLowIrqController:
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| 378 | mov dx, PORT_8259MA_IMR ; Load Mask Register address
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| 379 | ; Fall to Initialize_ClearBitFrom8259MaskRegister
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| 380 |
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| 381 | ;--------------------------------------------------------------------
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| 382 | ; Unmasks interrupt from Master or Slave 8259 Interrupt Controller.
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| 383 | ;
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| 384 | ; Initialize_ClearBitFrom8259MaskRegister
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| 385 | ; Parameters:
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| 386 | ; AL: 8259 interrupt index (0...7)
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| 387 | ; DX: Port address to Interrupt Mask Register
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| 388 | ; Returns:
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| 389 | ; Nothing
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| 390 | ; Corrupts registers:
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| 391 | ; AX
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| 392 | ;--------------------------------------------------------------------
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| 393 | ALIGN JUMP_ALIGN
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| 394 | Initialize_ClearBitFrom8259MaskRegister:
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| 395 | push cx
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| 396 | xchg ax, cx ; IRQ index to CL
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| 397 | mov ch, 1 ; Load 1 to be shifted
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| 398 | shl ch, cl ; Shift bit to correct position
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| 399 | not ch ; Invert to create bit mask for clearing
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| 400 | in al, dx ; Read Interrupt Mask Register
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| 401 | and al, ch ; Clear wanted bit
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| 402 | out dx, al ; Write modified Interrupt Mask Register
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| 403 | pop cx
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| 404 | ret
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| 405 |
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| 406 |
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| 407 | ;--------------------------------------------------------------------
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| 408 | ; Resets all hard disks.
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| 409 | ;
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| 410 | ; Initialize_ResetDetectedDrives
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| 411 | ; Parameters:
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| 412 | ; DS: RAMVARS segment
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| 413 | ; Returns:
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| 414 | ; Nothing
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| 415 | ; Corrupts registers:
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| 416 | ; AX, BX, CX, DX, DI
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| 417 | ;--------------------------------------------------------------------
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| 418 | ALIGN JUMP_ALIGN
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| 419 | Initialize_ResetDetectedDrives:
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| 420 | ; Initialize to speed up POST. DOS will reset drives anyway.
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| 421 | eMOVZX cx, BYTE [RAMVARS.bDrvCnt]
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| 422 | jcxz .Return
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| 423 | mov dl, [RAMVARS.bFirstDrv]
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| 424 | ALIGN JUMP_ALIGN
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| 425 | .InitLoop:
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| 426 | call AH9h_InitializeDriveForUse
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| 427 | inc dx ; Next drive
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| 428 | loop .InitLoop
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| 429 | .Return:
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| 430 | ret
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