nand.s

三星S3c2410 WinCE Bsp,内含(eBoot)代码

;
; Copyright (c) Microsoft Corporation.  All rights reserved.
;
;
; Use of this source code is subject to the terms of the Microsoft end-user
; license agreement (EULA) under which you licensed this SOFTWARE PRODUCT.
; If you did not accept the terms of the EULA, you are not authorized to use
; this source code. For a copy of the EULA, please see the LICENSE.RTF on your
; install media.
;
    ; 
    ; NAND(SmartCard) Related Routines
    ;      

    INCLUDE kxarm.h
        
    TEXTAREA

    MACRO 
    LDR4STR1 $src, $tmp1, $tmp2    
        ldrb    $tmp1, [$src]
        ldrb    $tmp2, [$src]
        orr    $tmp1, $tmp1, $tmp2, lsl #8
        ldrb    $tmp2, [$src]
        orr    $tmp1, $tmp1, $tmp2, lsl #16
        ldrb    $tmp2, [$src]
        orr    $tmp1, $tmp1, $tmp2, lsl #24
    MEND

    MACRO 
    STR4LDR1 $tgt, $src
        strb    $src, [$tgt]
        mov     $src, $src, lsr #8
        strb    $src, [$tgt]
        mov     $src, $src, lsr #8
        strb    $src, [$tgt]
        mov     $src, $src, lsr #8
        strb    $src, [$tgt]
    MEND

    ; Read one sector.  Buffer (r0) must be aligned.
    ;
    LEAF_ENTRY RdPage512
        stmfd    sp!,{r1 - r11}

        ldr    r1, =0xb0e0000c  ;NFDATA
        mov    r2, #0x200
1    
        LDR4STR1 r1,  r4, r3
        LDR4STR1 r1,  r5, r3
        LDR4STR1 r1,  r6, r3
        LDR4STR1 r1,  r7, r3
        LDR4STR1 r1,  r8, r3
        LDR4STR1 r1,  r9, r3
        LDR4STR1 r1, r10, r3
        LDR4STR1 r1, r11, r3

        stmia    r0!, {r4 - r11}
        subs    r2, r2, #32
        bne    %B1

        ldmfd    sp!, {r1 - r11}

        IF Interworking :LOR: Thumbing
          bx  lr
        ELSE
          mov  pc, lr          ; return
        ENDIF

    ; Read one sector.  Handles case where buffer (r0) is unaligned.
    ;
    LEAF_ENTRY RdPage512Unalign
        stmfd    sp!,{r1 - r12}

        ldr    r1, =0xb0e0000c  ;NFDATA
        mov    r2, #480

        ; Calculate number of unaligned bytes to read (r12 = 4 - (r0 & 3))
        and    r12, r0, #3
        rsb    r12, r12, #4
        mov    r3, r12
        
rd_unalign1
        ; Read unaligned bytes
        ldrb    r4, [r1]
        strb    r4, [r0]
        add    r0, r0, #1
        subs    r3, r3, #1
        bne    rd_unalign1
        
rd_main    
        ; Read 480 bytes (32 x 15)
        LDR4STR1 r1,  r4, r3
        LDR4STR1 r1,  r5, r3
        LDR4STR1 r1,  r6, r3
        LDR4STR1 r1,  r7, r3
        LDR4STR1 r1,  r8, r3
        LDR4STR1 r1,  r9, r3
        LDR4STR1 r1, r10, r3
        LDR4STR1 r1, r11, r3

        stmia    r0!, {r4 - r11}
        subs    r2, r2, #32
        bne    rd_main

        ; Read 28 bytes
        LDR4STR1 r1,  r4, r3
        LDR4STR1 r1,  r5, r3
        LDR4STR1 r1,  r6, r3
        LDR4STR1 r1,  r7, r3
        LDR4STR1 r1,  r8, r3
        LDR4STR1 r1,  r9, r3
        LDR4STR1 r1, r10, r3
        stmia    r0!, {r4 - r10}

        ; Read trailing unaligned bytes
        rsbs    r12, r12, #4
        beq    rd_exit
        
rd_unalign2
        ldrb    r4, [r1]
        strb    r4, [r0]
        add    r0, r0, #1
        subs    r12, r12, #1
        bne    rd_unalign2       
rd_exit
        ldmfd    sp!, {r1 - r12}

        IF Interworking :LOR: Thumbing
          bx  lr
        ELSE
          mov  pc, lr          ; return
        ENDIF


    ; Write one sector.  Buffer (r0) must be aligned.
    ;
    LEAF_ENTRY    WrPage512
        stmfd    sp!,{r1 - r11}

        ldr    r1, =0xb0e0000c  ;NFDATA
        mov    r2, #0x200
1
        ldmia   r0!, {r4 - r11}

        STR4LDR1 r1,  r4
        STR4LDR1 r1,  r5
        STR4LDR1 r1,  r6
        STR4LDR1 r1,  r7
        STR4LDR1 r1,  r8
        STR4LDR1 r1,  r9
        STR4LDR1 r1, r10
        STR4LDR1 r1, r11

        subs    r2, r2, #32
        bne    %B1

        ldmfd    sp!, {r1 - r11}

        IF Interworking :LOR: Thumbing
          bx  lr
        ELSE
          mov  pc, lr          ; return
        ENDIF

    ; Writes one sector.  Handles case where buffer (r0) is unaligned.
    ;
    LEAF_ENTRY    WrPage512Unalign
        stmfd    sp!,{r1 - r11}

        ldr    r1, =0xb0e0000c  ;NFDATA
        mov    r2, #480

        ; Calculate number of unaligned bytes to read (r12 = 4 - (r0 & 3))
        and    r12, r0, #3
        rsb    r12, r12, #4
        mov    r3, r12
        
wr_unalign1
        ; Write unaligned bytes
        ldrb    r4, [r0]
        strb    r4, [r1]
        add    r0, r0, #1
        subs    r3, r3, #1
        bne    wr_unalign1

wr_main    
        ; Write 480 bytes (32 x 15)
        ldmia   r0!, {r4 - r11}

        STR4LDR1 r1,  r4
        STR4LDR1 r1,  r5
        STR4LDR1 r1,  r6
        STR4LDR1 r1,  r7
        STR4LDR1 r1,  r8
        STR4LDR1 r1,  r9
        STR4LDR1 r1, r10
        STR4LDR1 r1, r11

        subs    r2, r2, #32
        bne    wr_main

        ; Write 28 bytes
        ldmia   r0!, {r4 - r10}
        STR4LDR1 r1,  r4
        STR4LDR1 r1,  r5
        STR4LDR1 r1,  r6
        STR4LDR1 r1,  r7
        STR4LDR1 r1,  r8
        STR4LDR1 r1,  r9
        STR4LDR1 r1, r10

        ; Write trailing unaligned bytes
        rsbs    r12, r12, #4
        beq    wr_exit
        
wr_unalign2
        ldrb    r4, [r0]
        strb    r4, [r1]
        add    r0, r0, #1
        subs    r12, r12, #1
        bne    wr_unalign2       

wr_exit
        ldmfd    sp!, {r1 - r11}

        IF Interworking :LOR: Thumbing
          bx  lr
        ELSE
          mov  pc, lr          ; return
        ENDIF


    ; Read page/sector information.  This includes logical sector number
    ; and block status flags (RO, OEM-defined, etc.).
    ;
    LEAF_ENTRY RdPageInfo
        stmfd sp!, {r1 - r4}
        ldr   r1, =0xb0e0000c   ; NFDATA.
        LDR4STR1 r1, r3, r2
        LDR4STR1 r1, r4, r2
        stmia r0!, {r3 - r4}
        ldmfd sp!, {r1 - r4}

        IF Interworking :LOR: Thumbing
          bx  lr
        ELSE
          mov  pc, lr          ; return
        ENDIF
        

    ; Store page/sector information.  This includes logical sector number
    ; and block status flags (RO, OEM-defined, etc.).
    ;
    LEAF_ENTRY WrPageInfo
        stmfd sp!, {r1 - r3}
        ldr   r1,  =0xb0e0000c  ; NFDATA.
        ldmia r0!, {r2 - r3}
        STR4LDR1 r1, r2
        STR4LDR1 r1, r3
        ldmfd sp!, {r1 - r3}

        IF Interworking :LOR: Thumbing
          bx  lr
        ELSE
          mov  pc, lr          ; return
        ENDIF

    END