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;;                                                              ;;
;; Copyright (C) KolibriOS team 2004-2022. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License    ;;
;;                                                              ;;
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$Revision$


;setting date,time,clock and alarm-clock
;add sys_settime at servetable as for ex. 22 fcn:
; 22 - SETTING DATE TIME, CLOCK AND ALARM-CLOCK
; ebx =0 - set time ecx - 00SSMMHH
; ebx =1 - set date ecx=00DDMMYY
; ebx =2 - set day of week ecx- 1-7
; ebx =3 - set alarm-clock ecx - 00SSMMHH
; out: 0 -Ok 1 -wrong format 2 -battery low
sys_settime:
        cli
        mov     al, 0x0d
        out     0x70, al
        in      al, 0x71
        bt      ax, 7
        jnc     .bat_low
        cmp     ebx, 2  ;day of week
        jne     .nosetweek
        test    ecx, ecx   ;test day of week
        je      .wrongtime
        cmp     ecx, 7
        ja      .wrongtime
        mov     edx, 0x70
        call    startstopclk
        dec     edx
        mov     al, 6
        out     dx, al
        inc     edx
        mov     al, cl
        out     dx, al
        jmp     .endsettime
  .nosetweek:           ;set date
        cmp     ebx, 1
        jne     .nosetdate
        cmp     cl, 0x99;test year
        ja      .wrongtime
        shl     ecx, 4
        cmp     cl, 0x90
        ja      .wrongtime
        cmp     ch, 0x99;test month
        ja      .wrongtime
        shr     ecx, 4
        test    ch, ch
        je      .wrongtime
        cmp     ch, 0x12
        ja      .wrongtime
        shl     ecx, 8
        bswap   ecx   ;ebx=00YYMMDD
        test    cl, cl ;test day
        je      .wrongtime
        shl     ecx, 4
        cmp     cl, 0x90
        ja      .wrongtime
        shr     ecx, 4
        cmp     ch, 2 ;February
        jne     .testday
        cmp     cl, 0x29
        ja      .wrongtime
        jmp     .setdate
    .testday:
        cmp     ch, 8
        jb      .testday1 ;Aug-Dec
        bt      cx, 8
        jnc     .days31
        jmp     .days30
    .testday1:
        bt      cx, 8 ;Jan-Jul ex.Feb
        jnc     .days30
    .days31:
        cmp     cl, 0x31
        ja      .wrongtime
        jmp     .setdate
    .days30:
        cmp     cl, 0x30
        ja      .wrongtime
    .setdate:
        mov     edx, 0x70
        call    startstopclk
        dec     edx
        mov     al, 7    ;set days
        out     dx, al
        inc     edx
        mov     al, cl
        out     dx, al
        dec     edx
        mov     al, 8    ;set months
        out     dx, al
        inc     edx
        mov     al, ch
        out     dx, al
        dec     edx
        mov     al, 9    ;set years
        out     dx, al
        inc     edx
        shr     ecx, 8
        mov     al, ch
        out     dx, al
        jmp     .endsettime
    .nosetdate:       ;set time or alarm-clock
        cmp     ebx, 3
        ja      .wrongtime
        cmp     cl, 0x23
        ja      .wrongtime
        cmp     ch, 0x59
        ja      .wrongtime
        shl     ecx, 4
        cmp     cl, 0x90
        ja      .wrongtime
        cmp     ch, 0x92
        ja      .wrongtime
        shl     ecx, 4
        bswap   ecx    ;00HHMMSS
        cmp     cl, 0x59
        ja      .wrongtime
        shl     ecx, 4
        cmp     cl, 0x90
        ja      .wrongtime
        shr     ecx, 4

        mov     edx, 0x70
        call    startstopclk
        dec     edx
        cmp     ebx, 3
      
        je      .setalarm
        xor     eax, eax;al=0-set seconds
        out     dx, al
        inc     edx
        mov     al, cl
        out     dx, al
        dec     edx
        mov     al, 2 ;set minutes
        out     dx, al
        inc     edx
        mov     al, ch
        out     dx, al
        dec     edx
        mov     al, 4 ;set hours
        out     dx, al
        inc     edx
        shr     ecx, 8
        mov     al, ch
        out     dx, al
        jmp     .endsettime
   .setalarm:
        mov     al, 1;set seconds for al.
        out     dx, al
        inc     edx
        mov     al, cl
        out     dx, al
        dec     edx
        mov     al, 3;set minutes for al.
        out     dx, al
        inc     edx
        mov     al, ch
        out     dx, al
        dec     edx
        mov     al, 5;set hours for al.
        out     dx, al
        inc     edx
        shr     ecx, 8
        mov     al, ch
        out     dx, al
        dec     edx
        mov     al, 0x0b;enable irq's
        out     dx, al
        inc     dx
        in      al, dx
        bts     ax, 5;set bit 5
        out     dx, al
    .endsettime:
        dec     edx
        call    startstopclk
        sti
        and     [esp + SYSCALL_STACK.eax], dword 0
        ret
   .bat_low:
        sti
        mov     [esp + SYSCALL_STACK.eax], dword 2
        ret
   .wrongtime:
        sti
        mov     [esp + SYSCALL_STACK.eax], dword 1
        ret

startstopclk:
        mov     al, 0x0b
        out     dx, al
        inc     dx
        in      al, dx
        btc     ax, 7
        out     dx, al
        ret

align 4
sys_clock:
        cli
  ; Mikhail Lisovin  xx Jan 2005
  @@:
        mov     al, 10
        out     0x70, al
        in      al, 0x71
        test    al, al
        jns     @f
        mov     esi, 1
        call    delay_ms
        jmp     @b
  @@:
  ; end Lisovin's fix

        xor     al, al        ; seconds
        out     0x70, al
        in      al, 0x71
        movzx   ecx, al
        mov     al, 02        ; minutes
        shl     ecx, 16
        out     0x70, al
        in      al, 0x71
        movzx   edx, al
        mov     al, 04        ; hours
        shl     edx, 8
        out     0x70, al
        in      al, 0x71
        add     ecx, edx
        movzx   edx, al
        add     ecx, edx
        sti
        mov     [esp + SYSCALL_STACK.eax], ecx
        ret

align 4
sys_date:
        cli
  @@:
        mov     al, 10
        out     0x70, al
        in      al, 0x71
        test    al, al
        jns     @f
        mov     esi, 1
        call    delay_ms
        jmp     @b
  @@:
        mov     ch, 0
        mov     al, 7           ; date
        out     0x70, al
        in      al, 0x71
        mov     cl, al
        mov     al, 8           ; month
        shl     ecx, 16
        out     0x70, al
        in      al, 0x71
        mov     ch, al
        mov     al, 9           ; year
        out     0x70, al
        in      al, 0x71
        mov     cl, al
        sti
        mov     [esp + SYSCALL_STACK.eax], ecx
        ret