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mfpi test

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folkert van heusden 2022-04-11 19:09:16 +02:00
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commit c006727aa1
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; make sure current run-mode is kernel and previous is user
MOV #0177776,R0
MOV #030000,(R0)
NOP
; initialize kernel- and user stackpointers
; kernel
MOV #1000,R6
;; user
; MOV #0177717,R0
; MOV #1000,(R0)
; user: 060000-080000 will be mapped to physical address 020000
MOV #0177646,R0
; 020000 / 0100 (0100 => 64 decimal)
MOV #0200,(R0)
NOP
; user: make sure write- and read-access is possible
MOV #0177606,R0
MOV #077406,(R0)
; kernel: flat mapping
; 0-010000 -> 0
MOV #0172340,R0
MOV #0000,(R0)
; 060000-0100000 -> 060000
MOV #0172346,R0
MOV #0600,(R0)
NOP
; kernel: make sure write- and read-access is possible
; 0-010000
MOV #0172300,R0
MOV #077406,(R0)
; 060000-0100000
MOV #0172306,R0
MOV #077406,(R0)
; place a value at 020000 kernelspace which is
; 060000 in userspace
MOV #020000,R0
MOV #01234,(R0)
; MRR0
MOV #0177572,R0
; enable MMU traps
BIS #512,(R0)
; enable MMU
BIS #1,(R0)
; get word from 060000 in userspace and put that on
; the kernel stack
MOV #060000,R0
MFPI (R0)
NOP
; check for 01234
MOV (SP)+,R0
CMP #01234,R0
NOP
HALT
make_raw