1 files changed, 75 insertions, 0 deletions
diff --git a/fw/fe310/eos/soc/interrupt.c b/fw/fe310/eos/soc/interrupt.c
new file mode 100644
index 0000000..dab6fab
--- /dev/null
+++ b/fw/fe310/eos/soc/interrupt.c
@@ -0,0 +1,75 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#include "encoding.h"
+#include "platform.h"
+#include "plic_driver.h"
+
+#include "eos.h"
+#include "interrupt.h"
+
+// Global Instance data for the PLIC
+// for use by the PLIC Driver.
+static plic_instance_t plic;
+
+static eos_intr_handler_t ext_interrupt_handler[PLIC_NUM_INTERRUPTS];
+
+uintptr_t eos_intr_handle(uintptr_t int_num) {
+    if ((int_num >=1) && (int_num <= PLIC_NUM_INTERRUPTS) && (ext_interrupt_handler[int_num-1])) {
+        ext_interrupt_handler[int_num-1]();
+    } else {
+        printf("INTR ERROR:%d\n", int_num);
+        exit(int_num);
+    }
+    return int_num;
+}
+
+int eos_intr_init(uint8_t wakeup_cause) {
+    for (int i = 0; i < PLIC_NUM_INTERRUPTS; i++){
+        ext_interrupt_handler[i] = NULL;
+    }
+
+    /**************************************************************************
+    * Set up the PLIC
+    **************************************************************************/
+    PLIC_init(&plic,
+ 	    PLIC_CTRL_ADDR,
+ 	    PLIC_NUM_INTERRUPTS,
+ 	    PLIC_NUM_PRIORITIES);
+
+    // Enable Global (PLIC) interrupts.
+    set_csr(mie, MIP_MEIP);
+
+    // Enable all interrupts
+    set_csr(mstatus, MSTATUS_MIE);
+
+    return EOS_OK;
+}
+
+void eos_intr_set(uint8_t int_num, uint8_t priority, eos_intr_handler_t handler) {
+    ext_interrupt_handler[int_num-1] = handler;
+    PLIC_set_priority(&plic, int_num, priority);
+    PLIC_enable_interrupt(&plic, int_num);
+}
+
+void eos_intr_set_handler(uint8_t int_num, eos_intr_handler_t handler) {
+    ext_interrupt_handler[int_num-1] = handler;
+}
+
+void eos_intr_set_priority(uint8_t int_num, uint8_t priority) {
+    PLIC_set_priority(&plic, int_num, priority);
+}
+
+void eos_intr_enable(uint8_t int_num) {
+    PLIC_enable_interrupt(&plic, int_num);
+}
+
+void eos_intr_disable(uint8_t int_num) {
+    PLIC_disable_interrupt(&plic, int_num);
+}
+
+void eos_intr_mask(uint8_t priority) {
+    PLIC_set_threshold(&plic, priority);
+}