[patch 1/3] kvm test: add monitor_printf (v2)

[Marcelo Tosatti <mtosatti@xxxxxxxxxx>]

Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

Index: kvm-unit-tests/lib/x86/io.c
===================================================================
--- kvm-unit-tests.orig/lib/x86/io.c
+++ kvm-unit-tests/lib/x86/io.c
@@ -2,6 +2,7 @@
 #include "smp.h"
 
 static struct spinlock lock;
+static struct spinlock mon_lock;
 
 static void print_serial(const char *buf)
 {
@@ -17,6 +18,20 @@ void puts(const char *s)
 	spin_unlock(&lock);
 }
 
+static void print_monitor(const char *buf)
+{
+	unsigned long len = strlen(buf);
+
+	asm volatile ("rep/outsb" : "+S"(buf), "+c"(len) : "d"(0xf2));
+}
+
+void puts_monitor(const char *s)
+{
+	spin_lock(&mon_lock);
+	print_monitor(s);
+	spin_unlock(&mon_lock);
+}
+
 void exit(int code)
 {
         asm volatile("out %0, %1" : : "a"(code), "d"((short)0xf4));
Index: kvm-unit-tests/lib/libcflat.h
===================================================================
--- kvm-unit-tests.orig/lib/libcflat.h
+++ kvm-unit-tests/lib/libcflat.h
@@ -45,8 +45,10 @@ extern char *strcat(char *dest, const ch
 
 extern int printf(const char *fmt, ...);
 extern int vsnprintf(char *buf, int size, const char *fmt, va_list va);
+extern int monitor_printf(const char *fmt, ...);
 
 extern void puts(const char *s);
+extern void puts_monitor(const char *s);
 
 extern void *memset(void *s, int c, size_t n);
 
Index: kvm-unit-tests/lib/printf.c
===================================================================
--- kvm-unit-tests.orig/lib/printf.c
+++ kvm-unit-tests/lib/printf.c
@@ -177,3 +177,16 @@ int printf(const char *fmt, ...)
     puts(buf);
     return r;
 }
+
+int monitor_printf(const char *fmt, ...)
+{
+    va_list va;
+    char buf[2000];
+    int r;
+
+    va_start(va, fmt);
+    r = vsnprintf(buf, sizeof buf, fmt, va);
+    va_end(va);
+    puts_monitor(buf);
+    return r;
+}
--
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