From 4b9758c8ec6103c26228e1cda9731ab8bf1113e9 Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Tue, 25 Mar 2014 22:25:44 +0100
Subject: i386: improve the immediate console

Improve the immediate console to the point that it can be enabled and
display e.g. assertion failures from very early on (i.e. from
`c_boot_entry').

* device/cons.h (romgetc, romputc): New declarations.
* i386/configfrag.ac: Add configuration variable.
* i386/i386at/conf.c (dev_name_list): Add entry.
* i386/i386at/cons_conf.c (constab): Add entry.
* i386/i386at/immc.c: Add missing includes.
(immc_cnprobe, immc_cninit, immc_cngetc, immc_romputc): New functions.
(immc_cnputc): Fix signature, use virtual addresses.
* i386/i386at/immc.h: New file.
* i386/i386at/kd.c: Use `#if ENABLE_IMMEDIATE_CONSOLE'.
* i386/i386at/kd.h (kd_setpos): Add missing declaration.
* i386/i386at/model_dep.c (c_boot_entry): Install immediate console as
early boot console.
---
 device/cons.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'device')

diff --git a/device/cons.h b/device/cons.h
index 8ac796c..34f3bc5 100644
--- a/device/cons.h
+++ b/device/cons.h
@@ -54,4 +54,15 @@ extern int cngetc(void);
 extern int cnmaygetc(void);
 
 extern void cnputc(char);
+
+/*
+ * ROM getc/putc primitives.
+ * On some architectures, the boot ROM provides basic character input/output
+ * routines that can be used before devices are configured or virtual memory
+ * is enabled.  This can be useful to debug (or catch panics from) code early
+ * in the bootstrap procedure.
+ */
+extern int	(*romgetc)(char c);
+extern void	(*romputc)(char c);
+
 #endif /* _DEVICE_CONS_H */
-- 
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