                              1 ; /*-------------------------------------------------------------------------
                              2 ;
                              3 ;   crtbank.asm :- C run-time: bank switching
                              4 ;
                              5 ;    This library is free software; you can redistribute it and/or modify it
                              6 ;    under the terms of the GNU Library General Public License as published by the
                              7 ;    Free Software Foundation; either version 2, or (at your option) any
                              8 ;    later version.
                              9 ;
                             10 ;    This library is distributed in the hope that it will be useful,
                             11 ;    but WITHOUT ANY WARRANTY; without even the implied warranty of
                             12 ;    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                             13 ;    GNU Library General Public License for more details.
                             14 ;
                             15 ;    You should have received a copy of the GNU Library General Public License
                             16 ;    along with this program; if not, write to the Free Software
                             17 ;    Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
                             18 ;
                             19 ;    In other words, you are welcome to use, share and improve this program.
                             20 ;    You are forbidden to forbid anyone else to use, share and improve
                             21 ;    what you give them.   Help stamp out software-hoarding!
                             22 ; -------------------------------------------------------------------------*/
                             23 
                             24 	.area HOME    (CODE)
                             25 	.area GSINIT0 (CODE)
                             26 	.area GSINIT1 (CODE)
                             27 	.area GSINIT2 (CODE)
                             28 	.area GSINIT3 (CODE)
                             29 	.area GSINIT4 (CODE)
                             30 	.area GSINIT5 (CODE)
                             31 	.area GSINIT  (CODE)
                             32 	.area GSFINAL (CODE)
                             33 	.area CSEG    (CODE)
                             34 
                             35 ; /*-------------------------------------------------------------------------
                             36 ;   Example for SiLabs C8051F12x / C8051F13x with 128kB code memory
                             37 ;   divided into 4 banks of 32kB
                             38 ;   These devices have an sfr called PSBANK containing two parts:
                             39 ;   COBANK (bit 5:4): Constant Operations Bank
                             40 ;   IFBANK (bit 1:0): Instruction Fetch Bank
                             41 ;   From 0x0000 to 0x7FFF bank 0 is always accessed
                             42 ;   From 0x8000 to 0xFFFF bank COBANK is accessed for reading with movc
                             43 ;   From 0x8000 to 0xFFFF bank IFBANK is accessed for executing instructions
                             44 ;
                             45 ;   Make your own copy of this file,
                             46 ;   adapt it to your situation,
                             47 ;   and compile/link it in your project
                             48 ; -------------------------------------------------------------------------*/
                             49 
                             50 	.globl _PSBANK
                             51 
                             52 	.area HOME    (CODE)
                             53 
   0000                      54 __sdcc_banked_call::
   0000 C0*00                55 	push	_PSBANK		;save return bank
   0002 C8                   56 	xch	a,r0		;save Acc in r0, do not assume any register bank
   0003 C0 E0                57 	push	acc		;push LSB address
   0005 E9                   58 	mov	a,r1
   0006 C0 E0                59 	push	acc		;push MSB address
   0008 EA                   60 	mov	a,r2		;get new bank
   0009 54 0F                61 	anl	a,#0x0F		;remove storage class indicator
   000B 53r00 F0             62 	anl	_PSBANK,#0xF0
   000E 42*00                63 	orl	_PSBANK,a	;select bank
   0010 C8                   64 	xch	a,r0		;restore Acc
   0011 22                   65 	ret			;make the call
                             66 
   0012                      67 __sdcc_banked_ret::
   0012 D0*00                68 	pop	_PSBANK		;restore bank
   0014 22                   69 	ret			;return to caller
