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Subject[PATCH 2/6] x86_64: hpet_address cleanup
In preparation for supporting generic timekeeping, this patch cleans up 
x86-64's use of vxtime.hpet_address, changing it to just hpet_address
as is also used in i386. This is necessary since the vxtime structure
will be going away.

Signed-off-by: John Stultz <johnstul@us.ibm.com>


arch/i386/kernel/acpi/boot.c | 19 ++++++-------------
arch/x86_64/kernel/apic.c | 3 ++-
arch/x86_64/kernel/time.c | 34 ++++++++++++++++++----------------
include/asm-x86_64/hpet.h | 1 +
4 files changed, 27 insertions(+), 30 deletions(-)
linux-2.6.18-rc6_timeofday-arch-x86-64-part1_C6.patch
============================================
diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index ee003bc..ba6c82d 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -575,6 +575,7 @@ static int __init acpi_parse_sbf(unsigne
}

#ifdef CONFIG_HPET_TIMER
+#include <asm/hpet.h>

static int __init acpi_parse_hpet(unsigned long phys, unsigned long size)
{
@@ -595,21 +596,13 @@ static int __init acpi_parse_hpet(unsign
return -1;
}
#ifdef CONFIG_X86_64
- vxtime.hpet_address = hpet_tbl->addr.addrl |
+ hpet_address = hpet_tbl->addr.addrl |
((long)hpet_tbl->addr.addrh << 32);
-
+#else
+ hpet_address = hpet_tbl->addr.addrl;
+#endif
printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
- hpet_tbl->id, vxtime.hpet_address);
-#else /* X86 */
- {
- extern unsigned long hpet_address;
-
- hpet_address = hpet_tbl->addr.addrl;
- printk(KERN_INFO PREFIX "HPET id: %#x base: %#lx\n",
- hpet_tbl->id, hpet_address);
- }
-#endif /* X86 */
-
+ hpet_tbl->id, hpet_address);
return 0;
}
#else
diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index 2b8cef0..1b9e3d3 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -36,6 +36,7 @@
#include <asm/idle.h>
#include <asm/proto.h>
#include <asm/timex.h>
+#include <asm/hpet.h>

int apic_verbosity;
int apic_runs_main_timer;
@@ -727,7 +728,7 @@ static void setup_APIC_timer(unsigned in
local_irq_save(flags);

/* wait for irq slice */
- if (vxtime.hpet_address && hpet_use_timer) {
+ if (hpet_address && hpet_use_timer) {
int trigger = hpet_readl(HPET_T0_CMP);
while (hpet_readl(HPET_COUNTER) >= trigger)
/* do nothing */ ;
diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
index 7a9b182..da89e60 100644
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -67,6 +67,7 @@ static int notsc __initdata = 0;

unsigned int cpu_khz; /* TSC clocks / usec, not used here */
EXPORT_SYMBOL(cpu_khz);
+unsigned long hpet_address;
static unsigned long hpet_period; /* fsecs / HPET clock */
unsigned long hpet_tick; /* HPET clocks / interrupt */
int hpet_use_timer; /* Use counter of hpet for time keeping, otherwise PIT */
@@ -326,7 +327,7 @@ static noinline void handle_lost_ticks(i
KERN_WARNING "Your time source seems to be instable or "
"some driver is hogging interupts\n");
print_symbol("rip %s\n", regs->rip);
- if (vxtime.mode == VXTIME_TSC && vxtime.hpet_address) {
+ if (vxtime.mode == VXTIME_TSC && hpet_address) {
printk(KERN_WARNING "Falling back to HPET\n");
if (hpet_use_timer)
vxtime.last = hpet_readl(HPET_T0_CMP) -
@@ -334,6 +335,7 @@ static noinline void handle_lost_ticks(i
else
vxtime.last = hpet_readl(HPET_COUNTER);
vxtime.mode = VXTIME_HPET;
+ vxtime.hpet_address = hpet_address;
do_gettimeoffset = do_gettimeoffset_hpet;
}
/* else should fall back to PIT, but code missing. */
@@ -364,7 +366,7 @@ void main_timer_handler(struct pt_regs *

write_seqlock(&xtime_lock);

- if (vxtime.hpet_address)
+ if (hpet_address)
offset = hpet_readl(HPET_COUNTER);

if (hpet_use_timer) {
@@ -734,7 +736,7 @@ static __init int late_hpet_init(void)
struct hpet_data hd;
unsigned int ntimer;

- if (!vxtime.hpet_address)
+ if (!hpet_address)
return 0;

memset(&hd, 0, sizeof (hd));
@@ -747,7 +749,7 @@ static __init int late_hpet_init(void)
* Register with driver.
* Timer0 and Timer1 is used by platform.
*/
- hd.hd_phys_address = vxtime.hpet_address;
+ hd.hd_phys_address = hpet_address;
hd.hd_address = (void __iomem *)fix_to_virt(FIX_HPET_BASE);
hd.hd_nirqs = ntimer;
hd.hd_flags = HPET_DATA_PLATFORM;
@@ -816,10 +818,10 @@ static int hpet_init(void)
{
unsigned int id;

- if (!vxtime.hpet_address)
+ if (!hpet_address)
return -1;
- set_fixmap_nocache(FIX_HPET_BASE, vxtime.hpet_address);
- __set_fixmap(VSYSCALL_HPET, vxtime.hpet_address, PAGE_KERNEL_VSYSCALL_NOCACHE);
+ set_fixmap_nocache(FIX_HPET_BASE, hpet_address);
+ __set_fixmap(VSYSCALL_HPET, hpet_address, PAGE_KERNEL_VSYSCALL_NOCACHE);

/*
* Read the period, compute tick and quotient.
@@ -873,7 +875,7 @@ void __init pit_stop_interrupt(void)
void __init stop_timer_interrupt(void)
{
char *name;
- if (vxtime.hpet_address) {
+ if (hpet_address) {
name = "HPET";
hpet_timer_stop_set_go(0);
} else {
@@ -899,8 +901,7 @@ void __init time_init(void)
char *gtod;

if (nohpet)
- vxtime.hpet_address = 0;
-
+ hpet_address = 0;
xtime.tv_sec = get_cmos_time();
xtime.tv_nsec = 0;

@@ -910,7 +911,7 @@ void __init time_init(void)
if (!hpet_init())
vxtime_hz = (FSEC_PER_SEC + hpet_period / 2) / hpet_period;
else
- vxtime.hpet_address = 0;
+ hpet_address = 0;

if (hpet_use_timer) {
/* set tick_nsec to use the proper rate for HPET */
@@ -918,7 +919,7 @@ void __init time_init(void)
cpu_khz = hpet_calibrate_tsc();
timename = "HPET";
#ifdef CONFIG_X86_PM_TIMER
- } else if (pmtmr_ioport && !vxtime.hpet_address) {
+ } else if (pmtmr_ioport && !hpet_address) {
vxtime_hz = PM_TIMER_FREQUENCY;
timename = "PM";
pit_init();
@@ -979,18 +980,19 @@ __init static char *time_init_gtod(void)

if (unsynchronized_tsc())
notsc = 1;
- if (vxtime.hpet_address && notsc) {
+ if (hpet_address && notsc) {
timetype = hpet_use_timer ? "HPET" : "PIT/HPET";
if (hpet_use_timer)
vxtime.last = hpet_readl(HPET_T0_CMP) - hpet_tick;
else
vxtime.last = hpet_readl(HPET_COUNTER);
vxtime.mode = VXTIME_HPET;
+ vxtime.hpet_address = hpet_address;
do_gettimeoffset = do_gettimeoffset_hpet;
#ifdef CONFIG_X86_PM_TIMER
/* Using PM for gettimeofday is quite slow, but we have no other
choice because the TSC is too unreliable on some systems. */
- } else if (pmtmr_ioport && !vxtime.hpet_address && notsc) {
+ } else if (pmtmr_ioport && !hpet_address && notsc) {
timetype = "PM";
do_gettimeoffset = do_gettimeoffset_pm;
vxtime.mode = VXTIME_PMTMR;
@@ -1033,7 +1035,7 @@ static int timer_resume(struct sys_devic
unsigned long ctime = get_cmos_time();
unsigned long sleep_length = (ctime - sleep_start) * HZ;

- if (vxtime.hpet_address)
+ if (hpet_address)
hpet_reenable();
else
i8254_timer_resume();
@@ -1118,7 +1120,7 @@ static unsigned int hpet_t1_cmp; /* cach

int is_hpet_enabled(void)
{
- return vxtime.hpet_address != 0;
+ return hpet_address != 0;
}

/*
diff --git a/include/asm-x86_64/hpet.h b/include/asm-x86_64/hpet.h
index b390984..60d5127 100644
--- a/include/asm-x86_64/hpet.h
+++ b/include/asm-x86_64/hpet.h
@@ -58,6 +58,7 @@ extern int hpet_rtc_timer_init(void);
extern int apic_is_clustered_box(void);

extern int hpet_use_timer;
+extern unsigned long hpet_address;

#ifdef CONFIG_HPET_EMULATE_RTC
extern int hpet_mask_rtc_irq_bit(unsigned long bit_mask);
-
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