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authorJustus Winter <4winter@informatik.uni-hamburg.de>2014-03-25 22:25:44 +0100
committerJustus Winter <4winter@informatik.uni-hamburg.de>2015-06-28 12:55:30 +0200
commit4b9758c8ec6103c26228e1cda9731ab8bf1113e9 (patch)
tree64a9ba6685441e675bee388958e57fa0ad53f8dd /device
parentfa5e2ae5645b3eb005931f60b5481ee7e478640e (diff)
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.
Diffstat (limited to 'device')
-rw-r--r--device/cons.h11
1 files changed, 11 insertions, 0 deletions
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 */