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authorFelix Fietkau <nbd@openwrt.org>2012-07-22 21:00:07 +0000
committerFelix Fietkau <nbd@openwrt.org>2012-07-22 21:00:07 +0000
commit2335304a08827f4f083eba2bfb73163516c5fd57 (patch)
treed54824af9e02be484acdf6caecd364b786250516 /include/prereq.mk
parentb59bc92c6edf517d0a2d958530ac58fc58f74c32 (diff)
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build: ensure that reordering of KCONFIG lines are handled properly and that the final result does not depend on the package scan order
SVN-Revision: 32788
Diffstat (limited to 'include/prereq.mk')
0 files changed, 0 insertions, 0 deletions
generated by cgit v1.2.3 (git 2.25.1) at 2026-02-14 15:53:47 +0000
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/******************************************************************************
 * domain_page.h
 * 
 * Allow temporary mapping of domain pages.
 * 
 * Copyright (c) 2003-2006, Keir Fraser <keir@xensource.com>
 */

#include <xen/config.h>
#include <xen/sched.h>
#include <xen/mm.h>
#include <xen/perfc.h>
#include <xen/domain_page.h>
#include <xen/shadow.h>
#include <asm/current.h>
#include <asm/flushtlb.h>
#include <asm/hardirq.h>

static inline struct vcpu *mapcache_current_vcpu(void)
{
    struct vcpu *v;

    /* In the common case we use the mapcache of the running VCPU. */
    v = current;

    /*
     * If guest_table is NULL, and we are running a paravirtualised guest,
     * then it means we are running on the idle domain's page table and must
     * therefore use its mapcache.
     */
    if ( unlikely(!pagetable_get_pfn(v->arch.guest_table)) && !hvm_guest(v) )
    {
        /* If we really are idling, perform lazy context switch now. */
        if ( (v = idle_vcpu[smp_processor_id()]) == current )
            __sync_lazy_execstate();
        /* We must now be running on the idle page table. */
        ASSERT(read_cr3() == __pa(idle_pg_table));
    }

    return v;
}

void *map_domain_page(unsigned long pfn)
{
    unsigned long va;
    unsigned int idx, i, vcpu;
    struct vcpu *v;
    struct mapcache *cache;
    struct vcpu_maphash_entry *hashent;

    ASSERT(!in_irq());

    perfc_incrc(map_domain_page_count);

    v = mapcache_current_vcpu();

    vcpu  = v->vcpu_id;
    cache = &v->domain->arch.mapcache;

    hashent = &cache->vcpu_maphash[vcpu].hash[MAPHASH_HASHFN(pfn)];
    if ( hashent->pfn == pfn )
    {
        idx = hashent->idx;
        hashent->refcnt++;
        ASSERT(hashent->refcnt != 0);
        ASSERT(l1e_get_pfn(cache->l1tab[idx]) == pfn);
        goto out;
    }

    spin_lock(&cache->lock);

    /* Has some other CPU caused a wrap? We must flush if so. */
    if ( unlikely(cache->epoch != cache->shadow_epoch[vcpu]) )
    {
        cache->shadow_epoch[vcpu] = cache->epoch;
        if ( NEED_FLUSH(tlbflush_time[smp_processor_id()],
                        cache->tlbflush_timestamp) )
        {
            perfc_incrc(domain_page_tlb_flush);
            local_flush_tlb();
        }
    }

    idx = find_next_zero_bit(cache->inuse, MAPCACHE_ENTRIES, cache->cursor);
    if ( unlikely(idx >= MAPCACHE_ENTRIES) )
    {
        /* /First/, clean the garbage map and update the inuse list. */
        for ( i = 0; i < ARRAY_SIZE(cache->garbage); i++ )
        {
            unsigned long x = xchg(&cache->garbage[i], 0);
            cache->inuse[i] &= ~x;