| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Common functions for initializing different
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| 3 | ; VLB and PCI IDE Controllers.
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| 4 |
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| 5 | ; Section containing code
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| 6 | SECTION .text
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| 7 |
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| 8 | ;--------------------------------------------------------------------
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| 9 | ; AdvAtaInit_DetectControllerForIdeBaseInBX
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| 10 | ; Parameters:
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| 11 | ; BX: IDE Controller base port
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| 12 | ; Returns:
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| 13 | ; AX: ID WORD specific for detected controller
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| 14 | ; Zero if no controller detected
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| 15 | ; DX: Controller base port (not IDE)
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| 16 | ; CF: Set if controller detected
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| 17 | ; Cleared if no controller
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| 18 | ; Corrupts registers:
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| 19 | ; BX
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| 20 | ;--------------------------------------------------------------------
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| 21 | AdvAtaInit_DetectControllerForIdeBaseInBX:
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| 22 | call Vision_DetectAndReturnIDinAXandPortInDXifControllerPresent
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| 23 | jne SHORT .NoAdvancedControllerForPortBX
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| 24 | call Vision_DoesIdePortInBXbelongToControllerWithIDinAX
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| 25 | jne SHORT .NoAdvancedControllerForPortBX
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| 26 |
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| 27 | stc ; Advanced Controller found for port BX
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| 28 | ret
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| 29 |
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| 30 | .NoAdvancedControllerForPortBX:
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| 31 | xor ax, ax
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| 32 | ret
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| 33 |
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| 34 |
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| 35 | ;--------------------------------------------------------------------
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| 36 | ; AdvAtaInit_GetControllerMaxPioModeToAL
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| 37 | ; Parameters:
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| 38 | ; AX: ID WORD specific for detected controller
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| 39 | ; Returns:
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| 40 | ; AL: Max supported PIO mode
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| 41 | ; AH: FLGH_DPT_IORDY if IORDY supported, zero otherwise
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| 42 | ; CF: Set if PIO limit necessary
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| 43 | ; Cleared if no need to limit timings
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| 44 | ; Corrupts registers:
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| 45 | ; (AX if CF cleared)
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| 46 | ;--------------------------------------------------------------------
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| 47 | AdvAtaInit_GetControllerMaxPioModeToAL equ Vision_GetMaxPioModeToAL
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| 48 |
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| 49 |
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| 50 | ;--------------------------------------------------------------------
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| 51 | ; AdvAtaInit_InitializeControllerForDPTinDSDI
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| 52 | ; Parameters:
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| 53 | ; DS:DI: Ptr to DPT for Single or Slave Drive
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| 54 | ; Returns:
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| 55 | ; CF: Cleared if success or no controller to initialize
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| 56 | ; Set if error
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| 57 | ; Corrupts registers:
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| 58 | ; AX, BX, CX, DX
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| 59 | ;--------------------------------------------------------------------
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| 60 | AdvAtaInit_InitializeControllerForDPTinDSDI:
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| 61 | push bp
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| 62 | push si
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| 63 |
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| 64 | ; Call Controller Specific initialization function
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| 65 | mov ax, [di+DPT_ADVANCED_ATA.wControllerID]
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| 66 | test ax, ax
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| 67 | jz SHORT .NoAdvancedController ; Return with CF cleared
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| 68 |
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| 69 | ; We only support Vision at the moment so no need to identify ID
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| 70 | call AdvAtaInit_LoadMasterDPTtoDSSIifSlaveInDSDI
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| 71 | call Vision_InitializeWithIDinAHandConfigInAL
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| 72 |
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| 73 | .NoAdvancedController:
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| 74 | pop si
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| 75 | pop bp
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| 76 | ret
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| 77 |
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| 78 |
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| 79 | ;--------------------------------------------------------------------
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| 80 | ; AdvAtaInit_LoadMasterDPTtoDSSIifSlaveInDSDI
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| 81 | ; Parameters:
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| 82 | ; DS:DI: Ptr to DPT for Single or Slave Drive
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| 83 | ; Returns:
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| 84 | ; DS:DI: Ptr to DPT for Single or Slave Drive
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| 85 | ; SI: Offset to Master DPT if Slave Drive present
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| 86 | ; Zero if Slave Drive not present
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| 87 | ; Corrupts registers:
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| 88 | ; AX
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| 89 | ;--------------------------------------------------------------------
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| 90 | AdvAtaInit_LoadMasterDPTtoDSSIifSlaveInDSDI:
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| 91 | ; Must be Slave Drive if previous DPT has same IDEVARS offset
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| 92 | lea si, [di-LARGEST_DPT_SIZE] ; DS:SI points to previous DPT
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| 93 | mov al, [di+DPT.bIdevarsOffset]
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| 94 | cmp al, [si+DPT.bIdevarsOffset]
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| 95 | je SHORT .MasterAndSlaveDrivePresent
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| 96 |
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| 97 | ; We only have single drive so zero SI
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| 98 | xor si, si
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| 99 | .MasterAndSlaveDrivePresent:
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| 100 | ret
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| 101 |
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| 102 |
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| 103 | ;--------------------------------------------------------------------
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| 104 | ; AdvAtaInit_SelectSlowestCommonPioTimingsToBXandCXfromDSSIandDSDI
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| 105 | ; Parameters:
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| 106 | ; DS:DI: Ptr to DPT for Single or Slave Drive
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| 107 | ; SI: Offset to Master DPT if Slave Drive present
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| 108 | ; Zero if Slave Drive not present
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| 109 | ; Returns:
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| 110 | ; BX: Best common PIO mode
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| 111 | ; CX: Slowest common PIO Cycle Time in nanosecs
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| 112 | ; Corrupts registers:
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| 113 | ; Nothing
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| 114 | ;--------------------------------------------------------------------
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| 115 | AdvAtaInit_SelectSlowestCommonPioTimingsToBXandCXfromDSSIandDSDI:
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| 116 | eMOVZX bx, [di+DPT_ADVANCED_ATA.bPioMode]
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| 117 | mov cx, [di+DPT_ADVANCED_ATA.wMinPioCycleTime]
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| 118 | test si, si
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| 119 | jz SHORT .PioTimingsLoadedToAXandCX
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| 120 | MIN_U bl, [si+DPT_ADVANCED_ATA.bPioMode]
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| 121 | MAX_U cx, [si+DPT_ADVANCED_ATA.wMinPioCycleTime]
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| 122 | .PioTimingsLoadedToAXandCX:
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| 123 | ret
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