isa/rv64mi/timer.S

   1 # See LICENSE for license details.
   2
   3 #*****************************************************************************
   4 # timer.S
   5 #-----------------------------------------------------------------------------
   6 #
   7 # Test timer interrupts.
   8 #
   9
  10 #include "riscv_test.h"
  11 #include "test_macros.h"
  12
  13 RVTEST_RV64M
  14 RVTEST_CODE_BEGIN
  15
  16 #define DELTA_T 5
  17
  18   li s8, 0         # number of taken timer interrupts
  19   li s9, 10        # how many interrupts to run for
  20
  21   .align 4
  22   csrr a0, mtime
  23   add a0, a0, DELTA_T
  24   csrw mtimecmp, a0
  25   li a0, MIP_MTIP
  26   csrs mie, a0
  27   csrs mstatus, MSTATUS_IE
  28
  29   # advance an LFSR until the timer has fired enough times
  30   li s0, 1023
  31   li s4, 0
  32 1:srl s2,s0,3
  33   xor s2,s2,s0
  34   and s2,s2,1
  35   srl s0,s0,1
  36   sll s2,s2,9
  37   or  s0,s2,s0
  38   and s0, s0, 0x3FF
  39   add s4, s4, 1
  40   bltu s8, s9, 1b
  41
  42   # make sure the LFSR was computed correctly
  43   li s1, 1023
  44   remu s4, s4, s1
  45   la s1, lfsr
  46   sll s4, s4, 2
  47   add s1, s1, s4
  48   lw s1, (s1)
  49   li TESTNUM, 2
  50   bne s0, s1, fail
  51
  52   RVTEST_PASS
  53
  54   TEST_PASSFAIL
  55
  56 mtvec_handler:
  57   li TESTNUM, 3
  58   csrr t0, mcause
  59   bgez t0, fail
  60
  61   sll t0, t0, 1
  62   addi t0, t0, -2*IRQ_TIMER
  63   bnez t0, fail
  64
  65   csrr t0, mtime
  66   addi t0, t0, DELTA_T
  67   csrw mtimecmp, t0
  68
  69   add s8, s8, 1
  70   eret
  71
  72 .data
  73 lfsr:
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1097
1098 RVTEST_CODE_END