depends VGA_CONSOLE
default y
+config CMOS
+ bool "Support for reading/writing CMOS bytes"
+ default y
+
endmenu
menu "Build Options"
TARGETS-$(CONFIG_SERIAL_CONSOLE) += drivers/serial.o
TARGETS-$(CONFIG_VGA_CONSOLE) += drivers/vga.o
TARGETS-$(CONFIG_PC_KEYBOARD) += drivers/keyboard.o
+TARGETS-$(CONFIG_CMOS) += drivers/cmos.o
--- /dev/null
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * 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.
+ */
+
+/*
+ * Datasheet:
+ * - Name: MC146818: Real-time Clock Plus RAM (RTC)
+ * - PDF: http://www.freescale.com/files/microcontrollers/doc/data_sheet/MC146818.pdf
+ * - Order number: MC146818/D
+ */
+
+/*
+ * See also:
+ * http://bochs.sourceforge.net/techspec/CMOS-reference.txt
+ * http://www.bioscentral.com/misc/cmosmap.htm
+ */
+
+#include <libpayload.h>
+
+#define RTC_PORT 0x70
+
+/**
+ * Read a byte from the specified CMOS address.
+ *
+ * @param addr The CMOS address to read a byte from.
+ * @return The byte at the given CMOS address.
+ */
+u8 cmos_read(u8 addr)
+{
+ outb(addr, RTC_PORT);
+ return inb(RTC_PORT + 1);
+}
+
+/**
+ * Write a byte to the specified CMOS address.
+ *
+ * @param val The byte to write to CMOS.
+ * @param addr The CMOS address to write to.
+ */
+void cmos_write(u8 val, u8 addr)
+{
+ outb(addr, RTC_PORT);
+ outb(val, RTC_PORT + 1);
+}
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
+/* Some CMOS byte definitions */
+#define CMOS_RTC_SECONDS 0
+#define CMOS_RTC_MINUTES 2
+#define CMOS_RTC_HOURS 4
+#define CMOS_RTC_DAY 7
+#define CMOS_RTC_MONTH 8
+#define CMOS_RTC_YEAR 9
+
+/* drivers/cmos.c */
+u8 cmos_read(u8 addr);
+void cmos_write(u8 val, u8 addr);
+
/* drivers/keyboard.c */
int keyboard_havechar(void);
unsigned char keyboard_get_scancode(void);
void *calloc(size_t nmemb, size_t size);
void *realloc(void *ptr, size_t size);
+/* libc/lib.c */
+int bcd2dec(int b);
+int dec2bcd(int d);
+
/* libc/memory.c */
void *memset(void *s, int c, size_t n);
void *memcpy(void *dst, const void *src, size_t n);
##
TARGETS-y += libc/malloc.o libc/printf.o libc/console.o libc/string.o
-TARGETS-y += libc/memory.o libc/ctype.o
-TARGETS-y += libc/ipchecksum.o
+TARGETS-y += libc/memory.o libc/ctype.o libc/ipchecksum.o libc/lib.o
--- /dev/null
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * 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.
+ */
+
+/*
+ * Convert a number in BCD format to decimal.
+ *
+ * @param b The BCD number.
+ * @return The given BCD number in decimal format.
+ */
+int bcd2dec(int b)
+{
+ return ((b >> 4) & 0x0f) * 10 + (b & 0x0f);
+}
+
+/*
+ * Convert a number in decimal format into the BCD format.
+ *
+ * @param d The decimal number.
+ * @return The given decimal number in BCD format.
+ */
+int dec2bcd(int d)
+{
+ return ((d / 10) << 4) | (d % 10);
+}
+
projects / coreboot.git / commitdiff