source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Initialization/AdvAtaInit.asm@ 363

; Project name  :   XTIDE Universal BIOS
; Description   :   Common functions for initializing different
;                   VLB and PCI IDE Controllers.

; Section containing code
SECTION .text

;--------------------------------------------------------------------
; AdvAtaInit_DetectControllerForIdeBaseInDX
;   Parameters:
;       DX:     IDE Controller base port
;   Returns:
;       AX:     ID WORD specific for detected controller
;               Zero if no controller detected
;       CX:     Controller base port (not IDE)
;       CF:     Set if controller detected
;               Cleared if no controller
;   Corrupts registers:
;       BX
;--------------------------------------------------------------------
AdvAtaInit_DetectControllerForIdeBaseInDX:
    call    Vision_DetectAndReturnIDinAXandPortInCXifControllerPresent
    jne     SHORT .NoAdvancedControllerForPortDX
    call    Vision_DoesIdePortInDXbelongToControllerWithIDinAX
    jne     SHORT .NoAdvancedControllerForPortDX

    stc     ; Advanced Controller found for port DX
    ret

.NoAdvancedControllerForPortDX:
    xor     ax, ax
    ret


;--------------------------------------------------------------------
; AdvAtaInit_GetControllerMaxPioModeToAL
;   Parameters:
;       AX:     ID WORD specific for detected controller
;   Returns:
;       AL:     Max supported PIO mode (if CF set)
;       CF:     Set if PIO limit necessary
;               Cleared if no need to limit timings
;   Corrupts registers:
;       Nothing
;--------------------------------------------------------------------
AdvAtaInit_GetControllerMaxPioModeToAL  equ Vision_GetMaxPioModeToAL


;--------------------------------------------------------------------
; AdvAtaInit_InitializeControllerForDPTinDSDI
;   Parameters:
;       DS:DI:  Ptr to DPT for Single or Slave Drive
;   Returns:
;       CF:     Cleared if success or no controller to initialize
;               Set if error
;   Corrupts registers:
;       AX, BX, CX, DX
;--------------------------------------------------------------------
AdvAtaInit_InitializeControllerForDPTinDSDI:
    push    ds
    push    si
    push    di

    ; PIO and Advanced Controller variables are stored to BOOTMENUINFO
    ; to keep the DPTs as small as possible.
    call    GetMasterAndSlaveBootMenuInfosToSIandDI
    cmp     WORD [BOOTVARS.wMagicWord], BOOTVARS_MAGIC_WORD
    clc
    jne     SHORT .BootMenuInfosAreNoLongerAvailable

    ; Call Controller Specific initialization function
    mov     ax, [si+BOOTMENUINFO.wControllerID]
    test    ax, ax
    jz      SHORT .NoAdvancedController
    call    Vision_InitializeWithIDinAHandConfigInAL    ; The only we support at the moment

.BootMenuInfosAreNoLongerAvailable:
.NoAdvancedController:
    pop     di
    pop     si
    pop     ds
    ret


;--------------------------------------------------------------------
; AdvAtaInit_GetMasterAndSlaveBootMenuInfosToSIandDI
;   Parameters:
;       DS:DI:  Ptr to DPT for Single or Slave Drive
;   Returns:
;       DS:SI:  Ptr to Single or Master Drive BOOTMENUINFO
;       DI:     Offset to Slave Drive BOOTMENUINFO
;               Zero if Slave Drive not present
;   Corrupts registers:
;       BX, DX, (DS will change!)
;--------------------------------------------------------------------
GetMasterAndSlaveBootMenuInfosToSIandDI:
    call    BootMenuInfo_ConvertDPTtoBX
    LOAD_BDA_SEGMENT_TO ds, di, !               ; Zero DI to assume no Slave Drive present

    mov     dx, [bx+BOOTMENUINFO.wIdeBasePort]  ; Load IDE Port from Single or Slave Drive
    lea     si, [bx+BOOTMENUINFO_size]          ; SI points to Slave Drive if present
    cmp     dx, [si+BOOTMENUINFO.wIdeBasePort]
    jne     SHORT .BootMenuInfoForSingleDriveInDSBX

    mov     di, si                              ; Slave Drive detected, copy pointer to DS:DI
.BootMenuInfoForSingleDriveInDSBX:
    mov     si, bx
    ret


;--------------------------------------------------------------------
; AdvAtaInit_SelectSlowestTimingsToBXandCX
;   Parameters:
;       DS:SI:  Ptr to BOOTMENUINFO for Master or Single Drive
;       DI:     Offset to BOOTMENUINFO for Slave Drive
;               Zero if Slave Drive not present
;   Returns:
;       BX:     Min Active Time in nanosecs
;       CX:     Min Recovery Time in nanosecs
;   Corrupts registers:
;       Nothing
;--------------------------------------------------------------------
AdvAtaInit_SelectSlowestTimingsToBXandCX:
    mov     bx, [si+BOOTMENUINFO.wMinPioActiveTimeNs]
    mov     cx, [si+BOOTMENUINFO.wMinPioRecoveryTimeNs]
    test    di, di
    jz      SHORT .ReturnSlowestTimingInBXandCX ; No Slave Drive

    ; If Active Time is greater, then must be the Recovery Time as well
    cmp     bx, [di+BOOTMENUINFO.wMinPioActiveTimeNs]
    jbe     SHORT .ReturnSlowestTimingInBXandCX
    mov     bx, [di+BOOTMENUINFO.wMinPioActiveTimeNs]
    mov     cx, [di+BOOTMENUINFO.wMinPioRecoveryTimeNs]
.ReturnSlowestTimingInBXandCX:
    ret