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;;; -*- asm -*-
;;;
;;; Copyright 2003 Free Software Foundation, Inc.
;;;
;;; This file is part of GNU Radio
;;;
;;; GNU Radio is free software; 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, or (at your option)
;;; any later version.
;;;
;;; GNU Radio is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Radio; see the file COPYING. If not, write to
;;; the Free Software Foundation, Inc., 51 Franklin Street,
;;; Boston, MA 02110-1301, USA.
;;; The default external memory initialization provided by sdcc is not
;;; appropriate to the FX2. This is derived from the sdcc code, but uses
;;; the FX2 specific _MPAGE sfr.
.area XISEG (XDATA) ; the initialized external data area
.area XINIT (CODE) ; the code space consts to init XISEG
.area XSEG (XDATA) ; zero initialized xdata
.area USBDESCSEG (XDATA); usb descriptors
;; BIG TIME KLUDGE!
;; Look at usrp_main.rst and count the bytes from our
;; "normal return location" to the first instruction following
;; the comment: "_mcs51_getRAMCLEAR () start"
INSTRUCTION_BYTES_TO_SKIP = 0x29 ; valid for sdcc 2.4.0
.area CSEG (CODE)
;; sfr that sets upper address byte of MOVX using @r0 or @r1
_MPAGE = 0x0092
__sdcc_external_startup::
; _mcs51_genXINIT() start
mov r1,#l_XINIT
mov a,r1
orl a,#(l_XINIT >> 8)
jz 00003$
mov r2,#((l_XINIT+255) >> 8)
mov dptr,#s_XINIT
mov r0,#s_XISEG
mov _MPAGE,#(s_XISEG >> 8)
00001$: clr a
movc a,@a+dptr
movx @r0,a
inc dptr
inc r0
cjne r0,#0,00002$
inc _MPAGE
00002$: djnz r1,00001$
djnz r2,00001$
mov _MPAGE,#0xFF
00003$:
;; Danger! Total KLUDGE!
;; We pop the return address, add a magic number to it
;; then jump to that address. Believe it or not, this
;; looks like the least kludgy way to handle this,
;; short of patching the compiler...
pop dph
pop dpl
mov a,#INSTRUCTION_BYTES_TO_SKIP
jmp @a+dptr
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