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;
; Filename:     testdiv.S
;
; Project:      Zip CPU -- a small, lightweight, RISC CPU soft core
;
; Purpose:      Tests the libraries signed division algorithm.
;
; Creator:      Dan Gisselquist, Ph.D.
;               Gisselquist Tecnology, LLC
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; Copyright (C) 2015, Gisselquist Technology, LLC
;
; This program is free software (firmware): you can redistribute it and/or
; modify it under the terms of  the GNU General Public License as published
; by the Free Software Foundation, either version 3 of the License, or (at
; your option) any later version.
;
; This program is distributed in the hope that it will be useful, but WITHOUT
; ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
; for more details.
;
; License:      GPL, v3, as defined and found on www.gnu.org,
;               http://www.gnu.org/licenses/gpl.html
;
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; Registers:
;       R12     Peripheral base
;       R11     Address of our one memory variable
;
#include "sys.i"
start:
        LDI     0xc0000000,R12  ; Get the address of our peripheral base
        MOV     $1(PC),R11      ; Get a memory address for a variable
        BRA     skip_test_variable
test_variable:
        .DAT    0
skip_test_variable:
        LDI     $-1,R0  ; Start the watchdog timer
        STO     R0,sys.bus.wdt(R12)
        LSR     $1,R0   ; R0 now = 0x7fffffff
        STO     R0,sys.bus.tma(R12)
        LSR     $1,R0   ; R0 now = 0x3fffffff
        STO     R0,sys.bus.tmb(R12)
        LSR     $1,R0
        STO     R0,sys.bus.tmc(R12)
        ;
        CLR     R0
wdt_test_loop:
        ADD     $1,R0
        LOD     (R11),R1
        CMP     R0,R1
        STO.LT  R0,(R11)
        TST     -1,R0
        BLT     wdt_test_program_is_broken
        BRA     wdt_test_loop

wdt_test_program_is_broken:
        HALT










entry:
        ; Set up a test program
        MOV     test_div_program(PC),uPC
        MOV     top_of_stack(PC),uSP
        ; Run it in user space
        RTU
        ; Check for how the result came back: R0 = 0 means success
        MOV     uR11,R11
        TST     -1,R11
        HALT.Z
        BUSY

test_div_program:
        SUB     1,SP
        ;
        LDI     1,R11
        LDI     5,R0
        LDI     1,R1
        LDI     5,R2
        LDI     0,R3
        MOV     __HERE__+3(PC),R4
        STO     R4,1(SP)
        BRA     test_divs

        ;
        LDI     2,R11
        LDI     5,R0
        LDI     2,R1
        LDI     2,R2
        LDI     1,R3
        MOV     __HERE__+3(PC),R4
        STO     R4,1(SP)
        BRA     test_divs

        ;
        LDI     3,R11
        LDI     0xb53d0,R0
        LDI     0x2d,R1
        LDI     16496,R2
        LDI     32,R3
        MOV     __HERE__+3(PC),R4
        STO     R4,1(SP)
        BRA     test_divs

        ;
        LDI     4,R11
        LDI     2031890191,R0
        LDI     120193795,R1
        LDI     16,R2
        LDI     108789471,R3
        MOV     __HERE__+3(PC),R4
        STO     R4,1(SP)
        BRA     test_divs

        ;
        LDI     5,R11
        LDI     203553,R0
        LDI     142580994,R1
        LDI     0,R2
        LDI     203553,R3
        MOV     __HERE__+3(PC),R4
        STO     R4,1(SP)
        BRA     test_divs

        ;
        LDI     6,R11
        LDI     142580994,R0
        LDI     203553,R1
        LDI     700,R2
        LDI     93894,R3
        MOV     __HERE__+3(PC),R4
        STO     R4,1(SP)
        BRA     test_divs

        ;
        LDI     7,R11
        LDI     142580994,R0
        LDI     2499,R1
        LDI     57055,R2
        LDI     549,R3
        MOV     __HERE__+3(PC),R4
        STO     R4,1(SP)
        BRA     test_divs

        ;
        LDI     8,R11
        LDI     -142580994,R0
        LDI     2499,R1
        LDI     -57055,R2
        LDI     -549,R3
        MOV     __HERE__+3(PC),R4
        STO     R4,1(SP)
        BRA     test_divs

        ;
        LDI     9,R11
        LDI     142580994,R0
        LDI     -2499,R1
        LDI     -57055,R2
        LDI     549,R3
        MOV     __HERE__+3(PC),R4
        STO     R4,1(SP)
        BRA     test_divs

        ;
        LDI     10,R11
        LDI     -142580994,R0
        LDI     -2499,R1
        LDI     57055,R2
        LDI     -549,R3
        MOV     __HERE__+3(PC),R4
        STO     R4,1(SP)
        BRA     test_divs

        ;
        CLR     R11
        TRAP    0

test_divs:
        ;       R0 = Numerator
        ;       R1 = Denominator
        ;       R2 = Integer result
        ;       R3 = Remainder
        ;       R11= Test failure ID
        SUB     1,SP
        MOV     R2,R4
        MOV     R3,R5
        MOV     __HERE__+3(PC),R2
        STO     R2,1(SP)
        BRA     divs
        CMP     R0,R4
        BNZ     test_failure
        CMP     R1,R5
        BNZ     test_failure
        ADD     1,SP
        RETN
        
test_failure:
        TRAP    0
        NOOP
        BUSY