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include \masm32\include64\masm64rt.inc
.code
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entry_point proc
USING r12,r13,r14,r15 ; save non volatile registers
LOCAL bwrt :QWORD
SaveRegs
mov r13, 1024*1024*256 ; set pad size here
mov r14, alloc(r13) ; allocate memory
mov r12, r14 ; copy memory address to r12
xor r15, r15 ; zero counter
@@:
rdrand rax ; generate random QWORD
mov [r12], rax ; write random value to memory
add r12, 8 ; set next write position
add r15, 8 ; add 8 to counter
cmp r15, r13 ; cmp counter to buffer length
jb @B
mov bwrt, savefile("random.pad",r14,r13) ; write result to disk
mfree r14 ; release memory
exec "ent random.pad" ; analyse result with ENT
waitkey ; pause to see results
RestoreRegs ; restore non volatile registers
.exit
entry_point endp
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end