eos support

1 files changed, 53 insertions, 0 deletions

diff --git a/code/fe310/eos/interrupt.c b/code/fe310/eos/interrupt.c
new file mode 100644
index 0000000..def1a24
--- /dev/null
+++ b/code/fe310/eos/interrupt.c
@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <unistd.h>
+
+#include "encoding.h"
+#include "platform.h"
+#include "plic/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_fptr_t ext_interrupt_handler[PLIC_NUM_INTERRUPTS];
+
+void handle_m_ext_interrupt(void) {
+    plic_source int_num  = PLIC_claim_interrupt(&plic);
+    if ((int_num >=1 ) && (int_num < PLIC_NUM_INTERRUPTS) && (ext_interrupt_handler[int_num])) {
+        ext_interrupt_handler[int_num]();
+    } else {
+        printf("handle_m_ext_interrupt error\n\n");
+        exit(1 + (uintptr_t) int_num);
+    }
+    PLIC_complete_interrupt(&plic, 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_handler(uint8_t int_num, uint8_t priority, eos_intr_fptr_t handler) {
+    ext_interrupt_handler[int_num] = handler;
+    PLIC_enable_interrupt(&plic, int_num);
+    PLIC_set_priority(&plic, int_num, priority);
+}