rampayload: Add the linuxcheck payload

The i386.c file uses standard 3f8 UART for some simple diagnostic
prints, and the libpayload console otherwise.

This payload was used to debug Linux as a rampayload and was very helpful
for that work.

Change-Id: I1cce5528780cd825fd91a88137fa70abd9f218e7
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: https://review.coreboot.org/28600
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/payloads/linuxcheck/linuxcheck.c b/payloads/linuxcheck/linuxcheck.c
new file mode 100644
index 0000000000..5e0fdba703
--- /dev/null
+++ b/payloads/linuxcheck/linuxcheck.c
@@ -0,0 +1,52 @@
+/*
+ * This file is part of the coreinfo project.
+ *
+ * Copyright (C) 2018 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <libpayload-config.h>
+#include <libpayload.h>
+#include "linuxcheck.h"
+
+extern struct console_output_driver *console_out;
+extern struct sysinfo_t lib_sysinfo;
+
+int main(void)
+{
+	int ret, i;
+
+	buts("Greetings from linuxcheck, via hard-coded calls to serial functions.\n");
+	if (console_out == NULL)
+		buts("Bad news: console_out is NULL\n");
+	if (lib_sysinfo.serial == NULL)
+		buts("Bad news: lib_sysinfo.serial is NULL. Very little will work well.\n");
+	ret = lib_get_sysinfo();
+	if (ret) {
+		buts("lib_get_sysinfo() is non-zero");
+		hex32(ret);
+		buts("\n");
+	}
+
+	buts("The next line should be puts works\n");
+	puts("puts works\n");
+	buts("If you did not see puts works, then you have a console issues\n");
+	buts("The next line should be 'printf works'\n");
+	printf("printf works\n");
+	buts(" ... if you did not see printf works, then you have a printf issue\n");
+	printf("Number of memory ranges: %d\n", lib_sysinfo.n_memranges);
+	for (i = 0; i < lib_sysinfo.n_memranges; i++) {
+		printf("%d: base 0x%08llx size 0x%08llx type 0x%x\n", i, lib_sysinfo.memrange[i].base, lib_sysinfo.memrange[i].size, lib_sysinfo.memrange[i].type);
+	}
+	buts("Now we will halt. Bye");
+	halt();
+	return 0;
+}