Subversion Repositories thor

; TestICache.asm - (C) 2017-2018 Robert Finch, Waterloo
;
; This file is part of FT64
;
;------------------------------------------------------------------------------
;
; system memory map
;
;
; 00000000 +----------------+
;          |                |
;          |                |
;          |                |
;          |                |
;          :  dram memory   : 512 MB
;          |                |
;          |                |
;          |                |
;          |                |
; 20000000 +----------------+
;          |                |
;          :     unused     :
;          |                |
; FF400000 +----------------+
;          |   scratchpad   | 32 kB
; FF408000 +----------------+
;          |     unused     |
; FFD00000 +----------------+
;          |                |
;          :    I/O area    : 1.0 M
;          |                |
; FFE00000 +----------------+
;          |                |
;          :     unused     :
;          |                |
; FFFC0000 +----------------+
;          |                |
;          :    boot rom    :
;          |                |
; FFFFFFFF +----------------+
;
;
;
; Test I-Cache
;
                org             0xFFFC0000
                jmp             brkrout

                org             0xFFFC0100
start:
        ; Seed random number generator
                ldi             r6,#$FFDC0000
                sh              r0,$0C04[r6]                    ; select stream #0
                ldi             r1,#$88888888
                sh              r1,$0C08[r6]                    ; set initial m_z
                ldi             r1,#$01234567
                sh              r1,$0C0C[r6]                    ; set initial m_w
.st4:
        ; Get a random number
                sh              r0,$FFDC0C04    ; set the stream
                nop                                             ; delay a wee bit
                lhu             r1,$FFDC0C00    ; get a number
                sh              r0,$FFDC0C00    ; generate next number

        ; convert to random address
                shl             r1,r1,#2
                and             r1,r1,#$3FFC
                add             r1,r1,#$FF400000        ; scratchram address
                
        ; Fill an area with test code
                ldi             r2,#15                  ; number of ops - 1
                ldi             r3,#.st2
.st3:
                lhu             r4,[r3+r2*4]
                sh              r4,[r1+r2*4]
                sub             r2,r2,#1
                bge             .st3
        
        ; Jump to the test code
                jal             r29,[r1]
                ldi             r2,#14
                cmp             r1,r1,r2
                bne             r1,r0,.st5
                bra             .st4
                
        ; Display fail code
.st5:
                ldi             r1,#$FA
                sb              r1,$FFDC0600
                bra             .st5

; Test code accumulates for 16 instructions, sum should be 14
                
.st2:
                ldi             r1,#0
                add             r1,r1,#1                
                add             r1,r1,#1                
                add             r1,r1,#1                
                add             r1,r1,#1                
                add             r1,r1,#1                
                add             r1,r1,#1                
                add             r1,r1,#1                
                add             r1,r1,#1                
                add             r1,r1,#1                
                add             r1,r1,#1                
                add             r1,r1,#1                
                add             r1,r1,#1                
                add             r1,r1,#1                
                add             r1,r1,#1                
                ret

brkrout:
                rti