66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
#include "tb_cxxrtl_io.h"
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#include "hazard3_csr.h"
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// Same as wfi_loop, but enable msleep.deepsleep and msleep.powerdown first.
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/*EXPECTED-OUTPUT***************************************************************
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Enabling IRQS...
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IRQ 1
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IRQ 2
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IRQ 3
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IRQ 4
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IRQ 5
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IRQ 6
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IRQ 7
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IRQ 8
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IRQ 9
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IRQ 10
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Took 10 IRQs, span 9 times
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*******************************************************************************/
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#define TIMER_INTERVAL 1000
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#define MAX_IRQ_COUNT 10
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#define __wfi() asm volatile ("wfi")
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#define __compiler_mb() asm volatile ("" ::: "memory")
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int irq_count;
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void __attribute__((interrupt)) isr_machine_timer() {
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__compiler_mb();
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++irq_count;
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__compiler_mb();
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tb_printf("IRQ %d\n", irq_count);
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// Disable timer IRQ via MTIE, or set the next timer IRQ
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if (irq_count >= MAX_IRQ_COUNT)
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asm ("csrc mie, %0" :: "r" (1u << 7));
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else
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mm_timer->mtimecmp = mm_timer->mtime + TIMER_INTERVAL;
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}
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int main() {
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irq_count = 0;
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__compiler_mb();
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// Per-IRQ enable for timer IRQ
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asm ("csrs mie, %0" :: "r" (1u << 7));
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write_csr(hazard3_csr_msleep, 0x7);
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tb_puts("Enabling IRQS...\n");
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// Global IRQ enable. Timer IRQ will fire immediately.
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asm ("csrsi mstatus, 0x8");
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// Count the number of sleep loop iterations to make sure the wfi waits
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int wait_spin_count;
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while (irq_count < MAX_IRQ_COUNT) {
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++wait_spin_count;
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__wfi();
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__compiler_mb();
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}
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tb_printf("Took %d IRQs, span %d times\n", irq_count, wait_spin_count);
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return irq_count != wait_spin_count + 1;
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}
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