Hi,
On s3c24xx user space tsc emulation is now supported with this patch. Note
that the patch for time.c is made against the patch I sent on Wednesday to
this list.
--
Sebastian
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index bffabf4..cae449a 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -730,8 +730,8 @@ ENTRY(__switch_to)
.align 5
.globl __ipipe_tsc_area_start
-__ipipe_tsc_area_start:
- .rep 8
+__ipipe_tsc_area_start:
+ .rep 12
.word 0
.endr
#endif /* CONFIG_IPIPE */
diff --git a/arch/arm/mach-s3c2410/time.c b/arch/arm/mach-s3c2410/time.c
index 622ed34..b1b4a86 100644
--- a/arch/arm/mach-s3c2410/time.c
+++ b/arch/arm/mach-s3c2410/time.c
@@ -73,7 +73,7 @@ EXPORT_SYMBOL(__ipipe_mach_ticks_per_jiffy);
int __ipipe_mach_timerint = IRQ_TIMER4;
EXPORT_SYMBOL(__ipipe_mach_timerint);
-static unsigned long long __ipipe_mach_tsc = 0;
+static unsigned long long *tsc;
static unsigned long timer_ackval = 1UL << (IRQ_TIMER4 - IRQ_EINT0);
static IPIPE_DEFINE_SPINLOCK(timer_lock);
@@ -82,7 +82,11 @@ EXPORT_SYMBOL(__ipipe_mach_timerstolen);
void __ipipe_mach_get_tscinfo(struct __ipipe_tscinfo *info)
{
- info->type = IPIPE_TSC_TYPE_NONE;
+ info->type = IPIPE_TSC_TYPE_DECREMENTER;
+ info->u.fr.counter = (unsigned *)0x51000038;
+ info->u.fr.mask = 0xffff;
+ info->u.fr.last_cnt = (unsigned *)(tsc + 1); /* means: +8 bytes */
+ info->u.fr.tsc = tsc;
}
#endif /* CONFIG_IPIPE */
@@ -146,7 +150,8 @@ static inline unsigned long getticksoffset_tscupdate(void)
tval = timer_freerunning_getvalue();
ticks = timer_freerunning_getticksoffset(tval);
last_free_running_tcnt = tval;
- __ipipe_mach_tsc += ticks;
+ *tsc += ticks;
+ *(unsigned *)(tsc + 1) = last_free_running_tcnt;
return ticks;
}
#endif /* CONFIG_IPIPE */
@@ -256,6 +261,9 @@ static void s3c2410_timer_setup (void)
}
#ifdef CONFIG_IPIPE
+ tsc = (unsigned long long *)__ipipe_tsc_area;
+ barrier();
+
__ipipe_mach_ticks_per_jiffy = tcnt;
#endif /* CONFIG_IPIPE */
@@ -334,7 +342,7 @@ notrace unsigned long long __ipipe_mach_get_tsc(void)
local_irq_save_hw_notrace(flags);
spin_lock(&timer_lock);
- result = __ipipe_mach_tsc + getticksoffset();
+ result = *tsc + getticksoffset();
spin_unlock(&timer_lock);
local_irq_restore_hw_notrace(flags);
return result;
diff --git a/include/asm-arm/ipipe.h b/include/asm-arm/ipipe.h
index b3d62bf..2f31f04 100644
--- a/include/asm-arm/ipipe.h
+++ b/include/asm-arm/ipipe.h
@@ -100,6 +100,9 @@ struct __ipipe_tscinfo {
struct {
unsigned *counter; /* Hw counter physical address */
unsigned mask; /* Significant bits in the hw counter. */
+ unsigned *last_cnt; /* Only for decrementing counter:
+ counter value when updating
+ tsc value. */
unsigned long long *tsc; /* 64 bits tsc value. */
} fr;
struct {
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