C++ (Cpp) lgdt_finish Exemples

Exemple #1

Fichier : gdt.c Projet : lacombar/netbsd-alc

/*
 * Load appropriate gdt descriptor; we better be running on *ci
 * (for the most part, this is how a CPU knows who it is).
 */
void
gdt_init_cpu(struct cpu_info *ci)
{
#ifndef XEN
    struct region_descriptor region;
    size_t max_len;

    max_len = MAXGDTSIZ * sizeof(gdt[0]);
    setregion(&region, ci->ci_gdt, max_len - 1);
    lgdt(&region);
#else
    size_t len = gdt_size[0] * sizeof(gdt[0]);
    unsigned long frames[len >> PAGE_SHIFT];
    vaddr_t va;
    pt_entry_t *ptp;
    int f;

    for (va = (vaddr_t)ci->ci_gdt, f = 0;
            va < (vaddr_t)ci->ci_gdt + len;
            va += PAGE_SIZE, f++) {
        KASSERT(va >= VM_MIN_KERNEL_ADDRESS);
        ptp = kvtopte(va);
        frames[f] = *ptp >> PAGE_SHIFT;
        pmap_pte_clearbits(ptp, PG_RW);
    }
    /* printk("loading gdt %x, %d entries, %d pages", */
    /* frames[0] << PAGE_SHIFT, gdt_size[0], len >> PAGE_SHIFT); */
    if (HYPERVISOR_set_gdt(frames, gdt_size[0]))
        panic("HYPERVISOR_set_gdt failed!\n");
    lgdt_finish();
#endif
}

Exemple #2

Fichier : gdt.c Projet : avsm/openbsd-xen-sys

/*
 * Load appropriate gdt descriptor; we better be running on *ci
 * (for the most part, this is how a cpu knows who it is).
 */
void
gdt_init_cpu(struct cpu_info *ci)
{
	size_t len = gdt_size[0] * sizeof(gdt[0]);
	unsigned long frames[len >> PAGE_SHIFT];
	vaddr_t va;
	pt_entry_t *ptp;
	pt_entry_t *maptp;
	int f;

	for (va = (vaddr_t)ci->ci_gdt, f = 0;
	     va < (vaddr_t)ci->ci_gdt + len;
	     va += PAGE_SIZE, f++) {
		KASSERT(va >= VM_MIN_KERNEL_ADDRESS);
		ptp = kvtopte(va);
		frames[f] = *ptp >> PAGE_SHIFT;
		maptp = (pt_entry_t *)vtomach((vaddr_t)ptp);
		PTE_CLEARBITS(ptp, maptp, PG_RW);
	}
	PTE_UPDATES_FLUSH();
	if (HYPERVISOR_set_gdt(frames, gdt_size[0]))
		panic("HYPERVISOR_set_gdt failed!\n");
	lgdt_finish();
}