Author: imp
Date: Wed Jan 22 21:20:08 2014
New Revision: 261038
URL: http://svnweb.freebsd.org/changeset/base/261038
Log:
Implement generic support for early printf. Thought I can't find the
paper trail now, this patch is similar to one posted for one of the
preliminary versions of a new armv6 port. I took them and made them
more generic. Option not enabled by default since each board/port has
to provide its own eputc, and possibly do other things as well...
Modified:
head/sys/conf/options
head/sys/kern/subr_prf.c
head/sys/sys/systm.h
Modified: head/sys/conf/options
==============================================================================
--- head/sys/conf/options Wed Jan 22 19:57:11 2014 (r261037)
+++ head/sys/conf/options Wed Jan 22 21:20:08 2014 (r261038)
@@ -62,6 +62,7 @@ KDB_TRACE opt_kdb.h
KDB_UNATTENDED opt_kdb.h
KLD_DEBUG opt_kld.h
SYSCTL_DEBUG opt_sysctl.h
+EARLY_PRINTF opt_global.h
TEXTDUMP_PREFERRED opt_ddb.h
TEXTDUMP_VERBOSE opt_ddb.h
Modified: head/sys/kern/subr_prf.c
==============================================================================
--- head/sys/kern/subr_prf.c Wed Jan 22 19:57:11 2014 (r261037)
+++ head/sys/kern/subr_prf.c Wed Jan 22 21:20:08 2014 (r261038)
@@ -1137,3 +1137,25 @@ hexdump(const void *ptr, int length, con
}
}
+#ifdef EARLY_PRINTF
+/*
+ * Support for calling an alternate printf early in boot (like before
+ * cn_init() can be called). Platforms need to define eputc that want
+ * to use this.
+ */
+static void
+early_putc_func(int ch, void *arg __unused)
+{
+ eputc(ch);
+}
+
+void
+eprintf(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ kvprintf(fmt, early_putc_func, NULL, 10, ap);
+ va_end(ap);
+}
+#endif
Modified: head/sys/sys/systm.h
==============================================================================
--- head/sys/sys/systm.h Wed Jan 22 19:57:11 2014 (r261037)
+++ head/sys/sys/systm.h Wed Jan 22 21:20:08 2014 (r261038)
@@ -196,6 +196,10 @@ void init_param1(void);
void init_param2(long physpages);
void init_static_kenv(char *, size_t);
void tablefull(const char *);
+#ifdef EARLY_PRINTF
+void eprintf(const char *, ...) __printflike(1, 2);
+void eputc(int ch);
+#endif
int kvprintf(char const *, void (*)(int, void*), void *, int,
__va_list) __printflike(1, 0);
void log(int, const char *, ...) __printflike(2, 3);
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