From 2887165ae2990e7f93038f3220ed74ee429b5244 Mon Sep 17 00:00:00 2001
From: Megan Wachs <megan@sifive.com>
Date: Wed, 20 Jul 2016 23:59:02 +0000
Subject: Initial Checkin

---
 software/shared/drivers_sifive/plic.h | 70 +++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 software/shared/drivers_sifive/plic.h

(limited to 'software/shared/drivers_sifive/plic.h')

diff --git a/software/shared/drivers_sifive/plic.h b/software/shared/drivers_sifive/plic.h
new file mode 100644
index 0000000..14118a5
--- /dev/null
+++ b/software/shared/drivers_sifive/plic.h
@@ -0,0 +1,70 @@
+// See LICENSE for license details.
+
+#ifndef PLIC_H
+#define PLIC_H
+
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <unistd.h>
+
+
+#include "encoding.h"
+
+// 32 bits per source
+#define PLIC_PRIORITY_OFFSET 0x0000UL
+#define PLIC_PRIORITY_SHIFT_PER_SOURCE 2
+// 1 bit per source (1 address)
+#define PLIC_PENDING_OFFSET  0x1000UL
+#define PLIC_PENDING_SHIFT_PER_SOURCE 0
+
+//0x80 per target
+#define PLIC_ENABLE_OFFSET   0x2000UL
+#define PLIC_ENABLE_SHIFT_PER_TARGET 7
+
+
+#define PLIC_THRESHOLD_OFFSET 0x200000UL
+#define PLIC_CLAIM_OFFSET     0x200004UL
+#define PLIC_THRESHOLD_SHIFT_PER_TARGET 12
+#define PLIC_CLAIM_SHIFT_PER_TARGET     12
+
+#define PLIC_MAX_SOURCE 1023
+#define PLIC_SOURCE_MASK 0x3FF
+
+#define PLIC_MAX_TARGET 15871
+#define PLIC_TARGET_MASK 0x3FFF
+
+
+typedef struct __plic_instance_t
+{
+  uintptr_t base_addr;
+
+  uint32_t num_sources;
+  uint32_t num_priorities;
+  
+} plic_instance_t;
+
+typedef uint32_t plic_source;
+typedef uint32_t plic_priority;
+typedef uint32_t plic_threshold;
+
+void PLIC_init (
+                plic_instance_t * this_plic,
+                uintptr_t             base_addr,
+                uint32_t num_sources,
+                uint32_t num_priorities
+                );
+  
+void PLIC_enable_interrupt (plic_instance_t * this_plic, plic_source source);
+
+void PLIC_disable_interrupt (plic_instance_t * this_plic, plic_source source);
+
+void PLIC_set_priority (plic_instance_t * this_plic, plic_source source, plic_priority priority);
+
+plic_source PLIC_claim_interrupt(plic_instance_t * this_plic);
+
+void PLIC_complete_interrupt(plic_instance_t * this_plic, plic_source source);
+
+void PLIC_set_threshold(plic_instance_t * this_plic, plic_threshold threshold);
+
+#endif
-- 
cgit v1.2.1-18-gbd029