add get_option to libpayload, so coreboot cmos options can be queried.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Jordan Crouse <jordan.crouse@amd.com>
Acked-by: Peter Stuge <peter@stuge.se>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3474 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

2 files changed, 107 insertions, 0 deletions

diff --git a/payloads/libpayload/drivers/Makefile.inc b/payloads/libpayload/drivers/Makefile.inc
index 2b4fe0b67f..fbd3d7ee6b 100644
--- a/payloads/libpayload/drivers/Makefile.inc
+++ b/payloads/libpayload/drivers/Makefile.inc
@@ -34,6 +34,7 @@ TARGETS-y += drivers/speaker.o
 TARGETS-$(CONFIG_SERIAL_CONSOLE) += drivers/serial.o
 TARGETS-$(CONFIG_PC_KEYBOARD) += drivers/keyboard.o
 TARGETS-$(CONFIG_NVRAM) += drivers/nvram.o
+TARGETS-$(CONFIG_NVRAM) += drivers/options.o
 
 # Video console drivers
 TARGETS-$(CONFIG_VIDEO_CONSOLE) += drivers/video/video.o
diff --git a/payloads/libpayload/drivers/options.c b/payloads/libpayload/drivers/options.c
new file mode 100644
index 0000000000..aa43340c6b
--- /dev/null
+++ b/payloads/libpayload/drivers/options.c
@@ -0,0 +1,106 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 coresystems GmbH
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <libpayload.h>
+#include <coreboot_tables.h>
+
+static int options_checksum_valid(void)
+{
+	int i;
+	int range_start = lib_sysinfo.cmos_range_start;
+	int range_end = lib_sysinfo.cmos_range_end;
+	int checksum_location = lib_sysinfo.cmos_checksum_location;
+	u16 checksum = 0, checksum_old;
+
+	for(i = range_start; i <= range_end; i++) {
+		checksum += nvram_read(i);
+	}
+	checksum = (~checksum)&0xffff;
+
+	checksum_old = ((nvram_read(checksum_location)<<8) | nvram_read(checksum_location+1));
+
+	return (checksum_old == checksum);
+}
+
+static int get_cmos_value(u32 bitnum, u32 len, void *valptr)
+{
+	u8 *value = (u8 *)valptr;
+	int offs = 0;
+	u32 addr, bit;
+	u8 reg8;
+
+	value = valptr;
+
+	/* Convert to byte borders */
+	addr=(bitnum / 8);
+	bit=(bitnum % 8);
+
+	/* Handle single byte or less */
+	if(len <= 8) {
+		reg8 = nvram_read(addr);
+		reg8 >>= bit;
+		value[0] = reg8 & ((1 << len) -1);
+		return 0;
+	}
+
+	/* When handling more than a byte, copy whole bytes */
+	while (len > 0) {
+		len -= 8;
+		value[offs++]=nvram_read(addr++);
+	}
+
+	return 0;
+}
+
+int get_option(void *dest, char *name)
+{
+	struct cb_cmos_option_table *option_table = lib_sysinfo.option_table;
+	struct cb_cmos_entries *cmos_entry;
+	int len = strnlen(name, CMOS_MAX_NAME_LENGTH);
+	
+	/* cmos entries are located right after the option table */
+	cmos_entry=(struct cb_cmos_entries*)((unsigned char *)option_table + option_table->header_length);
+
+	for (   cmos_entry = (struct cb_cmos_entries*)((unsigned char *)option_table + option_table->header_length);
+		cmos_entry->tag == CB_TAG_OPTION;
+		cmos_entry = (struct cb_cmos_entries*)((unsigned char *)cmos_entry + cmos_entry->size)) {
+		if (memcmp(cmos_entry->name, name, len))
+			continue;
+		if(get_cmos_value(cmos_entry->bit, cmos_entry->length, dest))
+			return 1;
+
+		if(!options_checksum_valid())
+			return 1;
+
+		return 0;
+	}
+
+	printf("ERROR: No such CMOS option (%s)\n", name);
+	return 1;
+}