Add support for ram payloadsrampayload

This is enabled by CONFIG_RAMPAYLOAD.

The code will look for a ram payload and, if it is found, try
to run it. If the load fails or the payload returns it will
continue with ramstage.

We also include a new payload, linuxcheck, which is intended
to verify that linux can be loaded and run, e.g. as a LinuxBoot
payload. Currently, it fails.

This does not yet work but it makes sense as a foundation on which
to build. For one thing, we need to build at least a few tables
for Linux. The goal for LinuxBoot is to build as few as possible.

To test with linuxcheck (linux is not even close to working):
cd payloads/linuxcheck/
cp x86config  .config
make

cd ../..
make

./build/cbfstool build/coreboot.rom add-payload -n fallback/rampayload -f payloads/linuxcheck/linuxcheck.elf

qemu-system-x86_64 -nographic -m 8192 -bios build/coreboot.rom -monitor /dev/pts/$1 -s

We need to change the payload menu so we can add a rampayload but it's a bit
tricky as written, so that must come later.

Note that I'm still creating a special purpose romselfboot. The idea of
merging romselfboot and selfboot is probably a good idea -- in the future.
I think until we know how this should look, such a merge is premature.

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>

Change-Id: I8199aae6776f6dee969b370b0e6a41ef96e854d8
clang-formatted-by: Ronald G. Minnich
Reviewed-on: https://review.coreboot.org/28402
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Tested-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/payloads/linuxcheck/linuxcheck.c b/payloads/linuxcheck/linuxcheck.c
new file mode 100644
index 000000000000..516df45b84d8
--- /dev/null
+++ b/payloads/linuxcheck/linuxcheck.c
@@ -0,0 +1,43 @@
+/*
+ * 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>
+
+extern struct console_output_driver *console_out;
+extern struct sysinfo_t lib_sysinfo;
+static void buts(char *s)
+{
+	int i;
+	for (i = 0; i < strlen(s); i++)
+		outb(s[i], 0x3f8);
+}
+int main(void)
+{
+	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");
+	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");
+	buts("Now we will halt. Bye");
+	halt();
+	return 0;
+}