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path: root/scripts/patch-kernel.sh

	Commit message (Collapse)	Author	Age	Files	Lines
*	small patch from Johannes 5 Joemann	Waldemar Brodkorb	2005-03-26	1	-0/+1
| | | |	git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@467 3c298f89-4303-0410-b956-a3cf2f4a3e73
*	nbd's makefile/menuconfig rewrite	Mike Baker	2005-03-06	1	-0/+53
	git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@307 3c298f89-4303-0410-b956-a3cf2f4a3e73

generated by cgit v1.2.3 (git 2.25.1) at 2026-02-05 12:01:22 +0000

/*
 * xen/arch/ia64/time.c
 *
 * Copyright (C) 2005 Hewlett-Packard Co
 *	Dan Magenheimer <dan.magenheimer@hp.com>
 */

#include <linux/config.h>

#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/profile.h>
#include <linux/sched.h>
#include <linux/time.h>
#include <linux/interrupt.h>
#include <linux/efi.h>
#include <linux/profile.h>
#include <linux/timex.h>

#include <asm/machvec.h>
#include <asm/delay.h>
#include <asm/hw_irq.h>
#include <asm/ptrace.h>
#include <asm/sal.h>
#include <asm/sections.h>
#include <asm/system.h>
#include <asm/vcpu.h>
#include <linux/jiffies.h>	// not included by xen/sched.h
#include <xen/softirq.h>
#include <xen/event.h>

/* FIXME: where these declarations should be there ? */
extern void ia64_init_itm(void);

seqlock_t xtime_lock __cacheline_aligned_in_smp = SEQLOCK_UNLOCKED;

#define TIME_KEEPER_ID  0
unsigned long domain0_ready = 0;
static s_time_t stime_irq = 0x0;       /* System time at last 'time update' */
static unsigned long itc_scale __read_mostly, ns_scale __read_mostly;
static unsigned long itc_at_irq;

static u32 wc_sec, wc_nsec; /* UTC time at last 'time update'. */
static void ia64_wallclock_set(void);

/* We don't expect an absolute cycle value here, since then no way
 * to prevent overflow for large norminator. Normally this conversion
 * is used for relative offset.
 */
u64 cycle_to_ns(u64 cycle)
{
    return (cycle * itc_scale) >> 32;
}

static u64 ns_to_cycle(u64 ns)
{
    return (ns * ns_scale) >> 32;
}

static inline u64 get_time_delta(void)
{
    s64      delta_itc;
    u64      cur_itc;
    
    cur_itc = ia64_get_itc();

    delta_itc = (s64)(cur_itc - itc_at_irq);

    /* Ensure that the returned system time is monotonically increasing. */
    if ( unlikely(delta_itc < 0) ) delta_itc = 0;
    return cycle_to_ns(delta_itc);
}


s_time_t get_s_time(void)
{
    s_time_t now;
    unsigned long seq;

    do {
	seq = read_seqbegin(&xtime_lock);
	now = stime_irq + get_time_delta();
    } while (unlikely(read_seqretry(&xtime_lock, seq)));

    return now; 
}

void update_vcpu_system_time(struct vcpu *v)
{
    /* N-op here, and let dom0 to manage system time directly */
    return;
}

void
xen_timer_interrupt (int irq, void *dev_id, struct pt_regs *regs)
{
	unsigned long new_itm, old_itc;

	new_itm = local_cpu_data->itm_next;
	while (1) {
		if (smp_processor_id() == TIME_KEEPER_ID) {
			/*
			 * Here we are in the timer irq handler. We have irqs locally
			 * disabled, but we don't know if the timer_bh is running on
			 * another CPU. We need to avoid to SMP race by acquiring the
			 * xtime_lock.
			 */
			write_seqlock(&xtime_lock);
			/* Updates system time (nanoseconds since boot). */
			old_itc = itc_at_irq;
			itc_at_irq = ia64_get_itc();
			stime_irq += cycle_to_ns(itc_at_irq - old_itc);

			write_sequnlock(&xtime_lock);