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/* timer_isr()
*
* This routine initializes the Z8536 timer on the SQSIO4 SQUALL
* board for the CVME961 board. The timer is setup to provide a
* tick every 0x10000 / 2 milliseconds. This is used to time
* executing code.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include "asm.h"
.set PORT_A, 0xc00000a8 # port A
.set PORT_B, 0xc00000a4 # port B
.set PORT_C, 0xc00000a0 # port C
.set CTL_PORT, 0xc00000ac # control port
.set T1CSR, 0x0a # T1 command/status reg
.set RELOAD, 0x24 # clr IP & IUS,allow countdown
/*
* Duplicating this symbol is stupid but eliminates
* toolset variation problems.
*/
PUBLIC(timerisr)
PUBLIC(_timerisr)
SYM (timerisr):
SYM (_timerisr):
#ldconst 1,r4
#modpc 0,r4,r4 # enable tracing
ld _Ttimer_val,r6 # r6 = test timer
ldconst T1CSR,r4 # r4 = T1 control status reg
stob r4,CTL_PORT # select T1CSR
ldconst RELOAD,r5 # r5 = reset value
stob r5,CTL_PORT # reset countdown
addo 1,r6,r6
st r6,_Ttimer_val # increment test timer
loop_til_cleared:
clrbit 4,sf0,sf0
bbs 4,sf0,loop_til_cleared
leaf: ret
.leafproc _flush_reg, flush_reg.lf
.globl _flush_reg, flush_reg.lf
_flush_reg:
lda leaf,g14 # g14 = exit address
flush_reg.lf:
flushreg
mov g14,g0 # g0 = exit address
ldconst 0,g14 # set g14 for non-leaf
bx (g0)
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