From cf7c06297d04bade9cd04c056f9ed510e64dd7bd Mon Sep 17 00:00:00 2001
From: Uros Majstorovic <majstor@majstor.org>
Date: Wed, 5 Aug 2020 03:39:22 +0200
Subject: code -> fw

---
 fw/fe310/eos/interrupt.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 fw/fe310/eos/interrupt.c

(limited to 'fw/fe310/eos/interrupt.c')

diff --git a/fw/fe310/eos/interrupt.c b/fw/fe310/eos/interrupt.c
new file mode 100644
index 0000000..820d1fa
--- /dev/null
+++ b/fw/fe310/eos/interrupt.c
@@ -0,0 +1,72 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#include "encoding.h"
+#include "platform.h"
+#include "plic_driver.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("error:%d\n", int_num);
+        exit(int_num);
+    }
+    return int_num;
+}
+
+void eos_intr_init(void) {
+    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);
+}
+
+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);
+}
-- 
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