C++ (Cpp) pmap_grow_direct_page_cache示例

示例#1

文件： uma_machdep.c 项目： fengsi/freebsd

void *
uma_small_alloc(uma_zone_t zone, vm_size_t bytes, u_int8_t *flags, int wait)
{
	vm_paddr_t pa;
	vm_page_t m;
	int pflags;
	void *va;

	*flags = UMA_SLAB_PRIV;
	pflags = malloc2vm_flags(wait) | VM_ALLOC_WIRED;

	for (;;) {
		m = vm_page_alloc_freelist(VM_FREELIST_DIRECT, pflags);
		if (m == NULL) {
			if (wait & M_NOWAIT)
				return (NULL);
			else
				pmap_grow_direct_page_cache();
		} else
			break;
	}

	pa = VM_PAGE_TO_PHYS(m);
	va = (void *)MIPS_PHYS_TO_DIRECT(pa);
	if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
		bzero(va, PAGE_SIZE);
	return (va);
}

示例#2

void *
uma_small_alloc(uma_zone_t zone, int bytes, u_int8_t *flags, int wait)
{
	vm_paddr_t pa;
	vm_page_t m;
	int pflags;
	void *va;

	*flags = UMA_SLAB_PRIV;

	if ((wait & (M_NOWAIT|M_USE_RESERVE)) == M_NOWAIT)
		pflags = VM_ALLOC_INTERRUPT;
	else
		pflags = VM_ALLOC_SYSTEM;

	for (;;) {
		m = pmap_alloc_direct_page(0, pflags);
		if (m == NULL) {
			if (wait & M_NOWAIT)
				return (NULL);
			else
				pmap_grow_direct_page_cache();
		} else
			break;
	}

	pa = VM_PAGE_TO_PHYS(m);
	va = (void *)MIPS_PHYS_TO_DIRECT(pa);
	if ((wait & M_ZERO) && (m->flags & PG_ZERO) == 0)
		bzero(va, PAGE_SIZE);
	return (va);
}