isa/rv64si/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_RV64S
  14 RVTEST_CODE_BEGIN
  15
  16 #ifdef __MACHINE_MODE
  17   #define sscratch mscratch
  18   #define sstatus mstatus
  19   #define scause mcause
  20   #define sepc mepc
  21   #define stvec_handler mtvec_handler
  22   #undef SSTATUS_PS
  23   #define SSTATUS_PS MSTATUS_PRV1
  24   #undef SSTATUS_IE
  25   #define SSTATUS_IE MSTATUS_IE
  26   #undef SSTATUS_TIE
  27   #define SSTATUS_TIE MSTATUS_STIE
  28 #endif
  29
  30   li s8, 0         # number of taken timer interrupts
  31   li s9, 10        # how many interrupts to run for
  32   csrw stimecmp, 1
  33   csrw stime, 0
  34   li a0, SSTATUS_IE | SSTATUS_TIE
  35   csrs sstatus, a0
  36
  37   # jump to user land
  38   li t0, SSTATUS_PS
  39   csrc sstatus, t0
  40   la t0, 1f
  41   csrw sepc, t0
  42   sret
  43   1:
  44
  45   # advance an LFSR 1000 times
  46   li s0, 1023
  47   li s4, 0
  48 1:srl s2,s0,3
  49   xor s2,s2,s0
  50   and s2,s2,1
  51   srl s0,s0,1
  52   sll s2,s2,9
  53   or  s0,s2,s0
  54   and s0, s0, 0x3FF
  55   add s4, s4, 1
  56   bltu s8, s9, 1b
  57
  58   # make sure the LFSR was computed correctly
  59   li s1, 1023
  60   remu s4, s4, s1
  61   la s1, lfsr
  62   sll s4, s4, 2
  63   add s1, s1, s4
  64   lw s1, (s1)
  65   li TESTNUM, 2
  66   bne s0, s1, fail
  67
  68   RVTEST_PASS
  69
  70   TEST_PASSFAIL
  71
  72 stvec_handler:
  73   li TESTNUM, 3
  74   csrr t0, scause
  75   bgez t0, fail
  76
  77   sll t0, t0, 1
  78   addi t0, t0, -2*IRQ_TIMER
  79   bnez t0, fail
  80
  81   csrr t0, stime
  82   addi t0, t0, 999
  83   csrw stimecmp, t0
  84
  85   add s8, s8, 1
  86   bltu s8, s9, stvec_return
  87
  88   li t0, SSTATUS_PS
  89   csrs sstatus, t0
  90   csrc sstatus, SSTATUS_IE
  91
  92 stvec_return:
  93   sret
  94
  95 .data
  96 lfsr:
  97 .word 1023
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  99 .word 255
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1120
1121 RVTEST_CODE_END