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Fixed timer offset in RV32 WALLY-wfi; simplified in RV64 WALLY-wfi

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This commit is contained in:
David Harris 2024-11-17 06:43:13 -08:00
parent ce0be9a9c9
commit 147f62d9a5
2 changed files with 26 additions and 32 deletions
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6
tests/wally-riscv-arch-test/riscv-test-suite/rv32i_m/privilege/src/WALLY-wfi-01.S
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@ -36,9 +36,9 @@ WRITE_READ_CSR mie, 0xFFF // Enable interrupts from all sources
// Code copied from test library to cause m time interrupt, with time loop replaced with wfi.
/* Note: the following line might cause problems in the future. If more than 0x50 cycles are needed before the wfi
/* Note: the following line might cause problems in the future. If more than 0x100 cycles are needed before the wfi
instruction begins, then the program might fall into a loop and run forever*/
li x28, 0x50 // Desired offset from the present time
li x28, 0x100 // Desired offset from the present time
mv a3, x28 // copy value in to know to stop waiting for interrupt after this many cycles
la x29, 0x02004000 // MTIMECMP register in CLINT
la x30, 0x0200BFF8 // MTIME register in CLINT
@ -47,9 +47,9 @@ lw x31, 4(x30) // high word of MTIME
add x28, x7, x28 // add desired offset to the current time
bgtu x28, x7, nowrap // check new time exceeds current time (no wraparound)
addi x31, x31, 1 // if wrap, increment most significant word
sw x31,4(x29) // store into most significant word of MTIMECMP
nowrap:
sw x31,4(x29) // store into most significant word of MTIMECMP
sw x28, 0(x29) // store into least significant word of MTIMECMP
auipc ra, 0x0

12
tests/wally-riscv-arch-test/riscv-test-suite/rv64i_m/privilege/src/WALLY-wfi-01.S
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@ -39,15 +39,9 @@ li x28, 0x60 // Desired offset from the present time
mv a3, x28 // copy value in to know to stop waiting for interrupt after this many cycles
la x29, 0x02004000 // MTIMECMP register in CLINT
la x30, 0x0200BFF8 // MTIME register in CLINT
lw x7, 0(x30) // low word of MTIME
lw x31, 4(x30) // high word of MTIME
add x28, x7, x28 // add desired offset to the current time
bgtu x28, x7, nowrap // check new time exceeds current time (no wraparound)
addi x31, x31, 1 // if wrap, increment most significant word
sw x31,4(x29) // store into most significant word of MTIMECMP
nowrap:
sw x28, 0(x29) // store into least significant word of MTIMECMP
ld x7, 0(x30) // read MTIME
add x28, x7, x28 // add offset
sw x28, 0(x29) // MTIMECMP = MTIME + offset
auipc ra, 0x0
addi ra, ra, 0xC // load address after wfi into ra so we return to the right place after handling the time interrupt