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;--------------------------------------------------------------------------
; crtbank.asm - C run-time: bank switching
;
; Copyright (C) 2005, Maarten Brock
;
; This library 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 2, or (at your option) any
; later version.
;
; This library 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 this library; see the file COPYING. If not, write to the
; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
; MA 02110-1301, USA.
;
; As a special exception, if you link this library with other files,
; some of which are compiled with SDCC, to produce an executable,
; this library does not by itself cause the resulting executable to
; be covered by the GNU General Public License. This exception does
; not however invalidate any other reasons why the executable file
; might be covered by the GNU General Public License.
;--------------------------------------------------------------------------
.area HOME (CODE)
.area GSINIT0 (CODE)
.area GSINIT1 (CODE)
.area GSINIT2 (CODE)
.area GSINIT3 (CODE)
.area GSINIT4 (CODE)
.area GSINIT5 (CODE)
.area GSINIT (CODE)
.area GSFINAL (CODE)
.area CSEG (CODE)
; /*-------------------------------------------------------------------------
; Example for SiLabs C8051F12x / C8051F13x with 128kB code memory
; divided into 4 banks of 32kB
; These devices have an sfr called PSBANK containing two parts:
; COBANK (bit 5:4): Constant Operations Bank
; IFBANK (bit 1:0): Instruction Fetch Bank
; From 0x0000 to 0x7FFF bank 0 is always accessed
; From 0x8000 to 0xFFFF bank COBANK is accessed for reading with movc
; From 0x8000 to 0xFFFF bank IFBANK is accessed for executing instructions
;
; Make your own copy of this file,
; adapt it to your situation,
; and compile/link it in your project
; -------------------------------------------------------------------------*/
.globl _PSBANK
.area HOME (CODE)
__sdcc_banked_call::
push _PSBANK ;save return bank
xch a,r0 ;save Acc in r0, do not assume any register bank
push acc ;push LSB address
mov a,r1
push acc ;push MSB address
mov a,r2 ;get new bank
anl a,#0x0F ;remove storage class indicator
anl _PSBANK,#0xF0
orl _PSBANK,a ;select bank
xch a,r0 ;restore Acc
ret ;make the call
__sdcc_banked_ret::
pop _PSBANK ;restore bank
ret ;return to caller
|
