diff options
Diffstat (limited to 'c/src/lib/libbsp/i960/cvme961/timer/timerisr.s')
| -rw-r--r-- | c/src/lib/libbsp/i960/cvme961/timer/timerisr.s | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/i960/cvme961/timer/timerisr.s b/c/src/lib/libbsp/i960/cvme961/timer/timerisr.s new file mode 100644 index 0000000000..02dc23cd5c --- /dev/null +++ b/c/src/lib/libbsp/i960/cvme961/timer/timerisr.s @@ -0,0 +1,59 @@ +/* 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, 1990, 1991, 1992, 1993, 1994. + * On-Line Applications Research Corporation (OAR). + * All rights assigned to U.S. Government, 1994. + * + * This material may be reproduced by or for the U.S. Government pursuant + * to the copyright license under the clause at DFARS 252.227-7013. This + * notice must appear in all copies of this file and its derivatives. + * + * $Id$ + */ + +#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 + + PUBLIC(_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) |