X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=debug%2Fprograms%2Finterrupt.c;fp=debug%2Fprograms%2Finterrupt.c;h=c2dd5eccf268e2006db98f8a17c48cf8d0413a85;hb=6c2ad1c5c27f5e19e005541f7665a32814d32e0f;hp=0000000000000000000000000000000000000000;hpb=706b6476a2eb320a84fef39716a7c19a83b68a39;p=riscv-tests.git

diff --git a/debug/programs/interrupt.c b/debug/programs/interrupt.c
new file mode 100644
index 0000000..c2dd5ec
--- /dev/null
+++ b/debug/programs/interrupt.c
@@ -0,0 +1,32 @@
+#include "init.h"
+#include "encoding.h"
+
+static volatile unsigned interrupt_count;
+static volatile unsigned local;
+
+static unsigned delta = 0x100;
+void *increment_count(unsigned hartid, unsigned mcause, void *mepc, void *sp)
+{
+    interrupt_count++;
+    // There is no guarantee that the interrupt is cleared immediately when
+    // MTIMECMP is written, so stick around here until that happens.
+    while (csr_read(mip) & MIP_MTIP) {
+        MTIMECMP[hartid] = MTIME + delta;
+    }
+    return mepc;
+}
+
+int main()
+{
+    interrupt_count = 0;
+    local = 0;
+    unsigned hartid = csr_read(mhartid);
+
+    set_trap_handler(increment_count);
+    MTIMECMP[hartid] = MTIME - 1;
+    enable_timer_interrupts();
+
+    while (1) {
+        local++;
+    }
+}