bios: asmiprobe command

Because with reordering architectures come order-dependent intermittent bugs.

software/bios/Makefile

@@ -1,7 +1,7 @@
 M2DIR=../..
 include $(M2DIR)/software/common.mak
 
-OBJECTS=crt0.o isr.o ddrinit.o main.o microudp.o tftp.o boot-helper.o boot.o dataflow.o
+OBJECTS=crt0.o isr.o sdram.o main.o microudp.o tftp.o boot-helper.o boot.o dataflow.o
 
 all: bios.bin
 

software/bios/main.c

@@ -13,7 +13,7 @@
 #include <hw/mem.h>
 #include <hw/minimac.h>
 
-#include "ddrinit.h"
+#include "sdram.h"
 #include "dataflow.h"
 #include "boot.h"
 
@@ -367,6 +367,7 @@ static void do_command(char *c)
 	else if(strcmp(token, "ddrwr") == 0) ddrwr(get_token(&c));
 	else if(strcmp(token, "memtest") == 0) memtest();
 	else if(strcmp(token, "ddrinit") == 0) ddrinit();
+	else if(strcmp(token, "asmiprobe") == 0) asmiprobe();
 	
 	else if(strcmp(token, "dfs") == 0) dfs(get_token(&c));
 

software/bios/sdram.c

@@ -3,8 +3,9 @@
 
 #include <hw/dfii.h>
 #include <hw/mem.h>
+#include <csrbase.h>
 
-#include "ddrinit.h"
+#include "sdram.h"
 
 static void cdelay(int i)
 {
@@ -196,3 +197,32 @@ int ddrinit(void)
 	
 	return 1;
 }
+
+static const char *format_slot_state(int state)
+{
+	switch(state) {
+		case 0: return "Empty";
+		case 1: return "Pending";
+		case 2: return "Processing";
+		default: return "UNEXPECTED VALUE";
+	}
+}
+
+void asmiprobe(void)
+{
+	volatile unsigned int *regs = (unsigned int *)ASMIPROBE_BASE;
+	int slot_count;
+	int trace_depth;
+	int i;
+	int offset;
+	
+	offset = 0;
+	slot_count = regs[offset++];
+	trace_depth = regs[offset++];
+	for(i=0;i<slot_count;i++)
+		printf("Slot #%d: %s\n", i, format_slot_state(regs[offset++]));
+	printf("Latest tags:\n");
+	for(i=0;i<trace_depth;i++)
+		printf("%d ", regs[offset++]);
+	printf("\n");
+}

software/bios/sdram.h

@@ -1,5 +1,5 @@
-#ifndef __DDRINIT_H
-#define __DDRINIT_H
+#ifndef __SDRAM_H
+#define __SDRAM_H
 
 void ddrsw(void);
 void ddrhw(void);
@@ -10,4 +10,6 @@ int memtest_silent(void);
 void memtest(void);
 int ddrinit(void);
 
-#endif /* __DDRINIT_H */
+void asmiprobe(void);
+
+#endif /* __SDRAM_H */