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| author |   David S. Miller <davem@sunset.davemloft.net> | 2006-02-11 01:01:55 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-03-20 01:12:17 -0800 |
| commit | 4bdff41464c2954c6f62f849df0e73eb9fa21c65 (patch) | |
| tree | 781d3d844f87cf66b780874c367852af20ca9acc /arch | |
| parent | [SPARC64]: Simplify sun4v TLB handling using macros. (diff) | |
| download | linux-dev-4bdff41464c2954c6f62f849df0e73eb9fa21c65.tar.xz linux-dev-4bdff41464c2954c6f62f849df0e73eb9fa21c65.zip | |
[SPARC64]: Fetch bootup time of day from Hypervisor.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc64/kernel/time.c | 58 |
1 files changed, 50 insertions, 8 deletions
diff --git a/arch/sparc64/kernel/time.c b/arch/sparc64/kernel/time.c index a22930d62adf..24681b9b4426 100644 --- a/arch/sparc64/kernel/time.c +++ b/arch/sparc64/kernel/time.c @@ -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); |