uvm32 initial version

common/uvm32_common_custom.h

@@ -0,0 +1,10 @@
+// Definitions needed by both host and target
+
+// CSRs for exposed host functions
+#define IOREQ_PRINT 0x13A
+#define IOREQ_PRINTLN 0x13B
+#define IOREQ_PRINTD 0x13C
+#define IOREQ_PRINTX 0x13D
+#define IOREQ_MILLIS 0x13F
+#define IOREQ_PRINTC 0x140
+

common/uvm32_sys.h

@@ -0,0 +1,5 @@
+// System provided IOREQs
+#define IOREQ_HALT 0x138
+#define IOREQ_YIELD 0x139
+
+#include "uvm32_common_custom.h"

common/uvm32_target.h

@@ -0,0 +1,39 @@
+// Common to all target code
+
+#include "uvm32_sys.h"
+
+// Basic types
+typedef long uint32_t;
+typedef char uint8_t;
+typedef int bool;
+#define true 1
+#define false 0
+
+// Convenience macro for defining CSR helper functions
+#define xstr(a) str(a)
+#define str(a) #a
+#define DEFINE_CSR_WRITE_FUNCTION(function_name, csr, typ) \
+    static void function_name(typ val) { \
+	    asm volatile( ".option norvc\ncsrrw x0," xstr(csr) ", %0\n" : : "r" (val)); \
+    }
+#define DEFINE_CSR_WRITE_FUNCTION_VOID(function_name, csr) \
+    static void function_name(void) { \
+	    asm volatile( ".option norvc\ncsrwi " xstr(csr) ", 0"); \
+    }
+
+#include "uvm32_common_custom.h"
+#include "uvm32_target_custom.h"
+
+// provide main, with setup()/loop() flow
+void setup(void);
+bool loop(void);
+
+#ifndef USE_MAIN
+void main(void) {
+    setup();
+    while(loop()) {
+        yield();
+    }
+}
+#endif
+

common/uvm32_target_custom.h

@@ -0,0 +1,17 @@
+// Define wrapper functions for target code to call CSRs
+
+DEFINE_CSR_WRITE_FUNCTION(print, IOREQ_PRINT, const char *)
+DEFINE_CSR_WRITE_FUNCTION(printd, IOREQ_PRINTD, uint32_t)
+DEFINE_CSR_WRITE_FUNCTION(printx, IOREQ_PRINTX, uint32_t)
+DEFINE_CSR_WRITE_FUNCTION(printc, IOREQ_PRINTC, char)
+DEFINE_CSR_WRITE_FUNCTION(println, IOREQ_PRINTLN, const char *)
+DEFINE_CSR_WRITE_FUNCTION_VOID(halt, IOREQ_HALT)
+DEFINE_CSR_WRITE_FUNCTION_VOID(yield, IOREQ_YIELD)
+DEFINE_CSR_WRITE_FUNCTION(millis_internal, IOREQ_MILLIS, uint32_t *)
+
+static inline uint32_t millis(void) {
+    static uint32_t m;
+    millis_internal(&m);
+    return m;
+}
+