hello_world: Debug print the gitinfo syscon register

.oOOo.
 ."      ".
 ;  .mw.  ;   Microwatt, it works.
  . '  ' .
   \ || /     HDL Git SHA1: 211d23c4ad4fb5-dirty
    ;..;
    ;..;
    `ww'

Signed-off-by: Dan Horák <dan@danny.cz>
Signed-off-by: Michael Neuling <mikey@neuling.org>

hello_world/Makefile

@@ -25,7 +25,8 @@ hello_world.bin: hello_world.elf
 	$(OBJCOPY) -O binary $^ $@
 
 hello_world.hex: hello_world.bin
-	../scripts/bin2hex.py $^ > $@
+	../scripts/bin2hex.py $^ > hello_world.hex.tmp
+	mv -f hello_world.hex.tmp hello_world.hex
 
 clean:
 	@rm -f *.o hello_world.elf hello_world.bin hello_world.hex

hello_world/hello_world.c

@@ -2,24 +2,46 @@
 #include <stdbool.h>
 
 #include "console.h"
+#include "io.h"
+#include "microwatt_soc.h"
 
-static char mw_logo[] =
-
+static char mw_logo1[] =
 "\n"
 "   .oOOo.     \n"
 " .\"      \". \n"
 " ;  .mw.  ;   Microwatt, it works.\n"
 "  . '  ' .    \n"
-"   \\ || /    \n"
+"   \\ || /     HDL Git SHA1: ";
+
+static char mw_logo2[] =
+"\n"
 "    ;..;      \n"
 "    ;..;      \n"
-"    `ww'   \n";
+"    `ww'      \n\n";
 
 int main(void)
 {
+	uint64_t gitinfo;
+	uint8_t c;
+        bool dirty;
+
 	console_init();
 
-	puts(mw_logo);
+	puts(mw_logo1);
+
+	gitinfo = readq(SYSCON_BASE + SYS_REG_GIT_INFO);
+        dirty = gitinfo >> 63;
+	for (int i = 0; i < 14; i++) {
+		c = (gitinfo >> 52) & 0xf;
+		if (c >= 10)
+                        putchar(0x61 + c - 10); // a-f
+                else
+                        putchar(0x30 + c); // 0-9
+		gitinfo <<= 4;
+	}
+        if (dirty)
+                puts("-dirty");
+	puts(mw_logo2);
 
 	while (1) {
 		unsigned char c = getchar();

hello_world/hello_world.hex

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 0000000000000000
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@@ -511,172 +511,172 @@ f801ffe138000000
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@@ -766,6 +766,12 @@ fffffebc00000094
 0000000000000000
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@@ -777,9 +783,6 @@ fffffebc00000094
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