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[SPARC64]: Fetch bootup time of day from Hypervisor. 

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-02-11 01:01:55 -08:00
parent 36a68e77c5
commit 4bdff41464
1 changed files with 50 additions and 8 deletions
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58
arch/sparc64/kernel/time.c
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@ -683,6 +683,48 @@ static void __init set_system_time(void)
}
}
/* davem suggests we keep this within the 4M locked kernel image */
static u32 starfire_get_time(void)
{
static char obp_gettod[32];
static u32 unix_tod;
sprintf(obp_gettod, "h# %08x unix-gettod",
(unsigned int) (long) &unix_tod);
prom_feval(obp_gettod);
return unix_tod;
}
static u32 hypervisor_get_time(void)
{
register unsigned long func asm("%o5");
register unsigned long arg0 asm("%o0");
register unsigned long arg1 asm("%o1");
int retries = 10000;
retry:
func = HV_FAST_TOD_GET;
arg0 = 0;
arg1 = 0;
__asm__ __volatile__("ta %6"
: "=&r" (func), "=&r" (arg0), "=&r" (arg1)
: "0" (func), "1" (arg0), "2" (arg1),
"i" (HV_FAST_TRAP));
if (arg0 == HV_EOK)
return arg1;
if (arg0 == HV_EWOULDBLOCK) {
if (--retries > 0) {
udelay(100);
goto retry;
}
printk(KERN_WARNING "SUN4V: tod_get() timed out.\n");
return 0;
}
printk(KERN_WARNING "SUN4V: tod_get() not supported.\n");
return 0;
}
void __init clock_probe(void)
{
struct linux_prom_registers clk_reg[2];
@ -702,14 +744,14 @@ void __init clock_probe(void)
if (this_is_starfire) {
/* davem suggests we keep this within the 4M locked kernel image */
static char obp_gettod[256];
static u32 unix_tod;
sprintf(obp_gettod, "h# %08x unix-gettod",
(unsigned int) (long) &unix_tod);
prom_feval(obp_gettod);
xtime.tv_sec = unix_tod;
xtime.tv_sec = starfire_get_time();
xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);
return;
}
if (tlb_type == hypervisor) {
xtime.tv_sec = hypervisor_get_time();
xtime.tv_nsec = (INITIAL_JIFFIES % HZ) * (NSEC_PER_SEC / HZ);
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);