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#include <pc80/mc146818rtc.h>
#include <fallback.h>
#include <cbfs.h>
#if CONFIG_USE_OPTION_TABLE
#include "option_table.h"
#endif
#ifndef CONFIG_MAX_REBOOT_CNT
#error "CONFIG_MAX_REBOOT_CNT not defined"
#endif
#if CONFIG_MAX_REBOOT_CNT > 15
#error "CONFIG_MAX_REBOOT_CNT too high"
#endif
#include <console/loglevel.h>
int do_printk(int msg_level, const char *fmt, ...) __attribute__((format(printf, 2, 3)));
#define printk_warning(fmt, arg...) do_printk(BIOS_WARNING ,fmt, ##arg)
#define printk_debug(fmt, arg...) do_printk(BIOS_DEBUG ,fmt, ##arg)
static int cmos_error(void)
{
unsigned char reg_d;
/* See if the cmos error condition has been flagged */
reg_d = cmos_read(RTC_REG_D);
printk_debug("CMOS_REG_D(VRT): %x\n", reg_d & RTC_VRT);
return (reg_d & RTC_VRT) == 0;
}
static int cmos_chksum_valid(void)
{
#if CONFIG_USE_OPTION_TABLE
unsigned char addr;
unsigned long sum, old_sum;
sum = 0;
/* Comput the cmos checksum */
for(addr = LB_CKS_RANGE_START; addr <= LB_CKS_RANGE_END; addr++) {
sum += cmos_read(addr);
}
sum = (sum & 0xffff) ^ 0xffff;
/* Read the stored checksum */
old_sum = cmos_read(LB_CKS_LOC) << 8;
old_sum |= cmos_read(LB_CKS_LOC+1);
printk_debug("CMOS checksum: old = %lx, new=%lx\n", old_sum, sum);
return sum == old_sum;
#else
return 0;
#endif
}
static inline int last_boot_normal(void)
{
unsigned char byte;
byte = cmos_read(RTC_BOOT_BYTE);
return (byte & (1 << 1));
}
static inline int do_normal_boot(void)
{
char *cmos_default = cbfs_find_file("cmos.default", 0xaa);
unsigned char byte;
int i;
if (cmos_error() || !cmos_chksum_valid()) {
if (cmos_default) {
printk_warning("WARNING - CMOS CORRUPTED. RESTORING DEFAULTS.\n");
/* First 14 bytes are reserved for
RTC and ignored by nvramtool, too.
Only 128 bytes: 128+ requires cmos configuration and
contains only suspend-to-ram data, which isn't part
of the recovery procedure. */
for (i = 14; i < 128; i++) {
cmos_write(cmos_default[i], i);
}
/* Now reboot to run with default cmos. */
outb(0x06, 0xcf9);
for (;;) asm("hlt"); /* Wait for reset! */
}
/* There are no impossible values, no checksums so just
* trust whatever value we have in the the cmos,
* but clear the fallback bit.
*/
byte = cmos_read(RTC_BOOT_BYTE);
byte &= 0x0c;
byte |= CONFIG_MAX_REBOOT_CNT << 4;
cmos_write(byte, RTC_BOOT_BYTE);
}
/* The RTC_BOOT_BYTE is now o.k. see where to go. */
byte = cmos_read(RTC_BOOT_BYTE);
/* Are we in normal mode? */
if (byte & 1) {
byte &= 0x0f; /* yes, clear the boot count */
}
/* Properly set the last boot flag */
byte &= 0xfc;
if ((byte >> 4) < CONFIG_MAX_REBOOT_CNT) {
byte |= (1<<1);
}
/* Are we already at the max count? */
if ((byte >> 4) < CONFIG_MAX_REBOOT_CNT) {
byte += 1 << 4; /* No, add 1 to the count */
}
else {
byte &= 0xfc; /* Yes, put in fallback mode */
}
/* Save the boot byte */
cmos_write(byte, RTC_BOOT_BYTE);
return (byte & (1<<1));
}
unsigned read_option(unsigned start, unsigned size, unsigned def)
{
#if CONFIG_USE_OPTION_TABLE
unsigned byte;
byte = cmos_read(start/8);
return (byte >> (start & 7U)) & ((1U << size) - 1U);
#else
return def;
#endif
}
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