isa/rv64si/timer.S

   1 #*****************************************************************************
   2 # ipi.S
   3 #-----------------------------------------------------------------------------
   4 #
   5 # Test interprocessor interrupts.
   6 #
   7
   8 #include "riscv_test.h"
   9 #include "test_macros.h"
  10
  11 RVTEST_RV64S
  12 RVTEST_CODE_BEGIN
  13
  14   # clear pending IPIs then enable interrupts
  15   li s8, 0         # number of taken timer interrupts
  16   li s9, 10        # how many interrupts to run for
  17   la a0, handler
  18   csrw evec, a0
  19   csrw compare, 1
  20   csrw count, 0
  21   li a0, SR_EI | (1 << (IRQ_TIMER + SR_IM_SHIFT))
  22   csrs status, a0
  23
  24   # advance an LFSR 1000 times
  25   li s0, 1023
  26   li s4, 0
  27 1:srl s2,s0,3
  28   xor s2,s2,s0
  29   and s2,s2,1
  30   srl s0,s0,1
  31   sll s2,s2,9
  32   or  s0,s2,s0
  33   sll s0,s0,54
  34   srl s0,s0,54
  35   add s4, s4, 1
  36   bltu s8, s9, 1b
  37
  38   csrc status, SR_EI
  39
  40   # make sure the LFSR was computed correctly
  41   li s1, 1023
  42   remu s4, s4, s1
  43   la s1, lfsr
  44   sll s4, s4, 2
  45   add s1, s1, s4
  46   lw s1, (s1)
  47   li TESTNUM, 2
  48   bne s0, s1, fail
  49
  50   RVTEST_PASS
  51
  52   TEST_PASSFAIL
  53
  54 handler:
  55   csrr t0, cause
  56   li t1, 0x8000000000000007
  57   li TESTNUM, 3
  58   bne t0, t1, fail
  59
  60   csrr t0, count
  61   addi t0, t0, 999
  62   csrw compare, t0
  63
  64   add s8, s8, 1
  65
  66   sret
  67
  68 .data
  69 lfsr:
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1093
1094 RVTEST_CODE_END