C++ (Cpp) pt_iscache_lookup примеры использования

Пример #1

int pt_image_add_cached(struct pt_image *image,
			struct pt_image_section_cache *iscache, int isid,
			const struct pt_asid *uasid)
{
	struct pt_section *section;
	struct pt_asid asid;
	uint64_t vaddr;
	int errcode, status;

	if (!image || !iscache)
		return -pte_invalid;

	errcode = pt_iscache_lookup(iscache, &section, &vaddr, isid);
	if (errcode < 0)
		return errcode;

	errcode = pt_asid_from_user(&asid, uasid);
	if (errcode < 0)
		return errcode;

	status = pt_image_add(image, section, &asid, vaddr, isid);

	/* We grab a reference when we add the section.  Drop the one we
	 * obtained from cache lookup.
	 */
	errcode = pt_section_put(section);
	if (errcode < 0)
		return errcode;

	return status;
}

Пример #2

int pt_iscache_read(struct pt_image_section_cache *iscache, uint8_t *buffer,
		    uint64_t size, int isid, uint64_t vaddr)
{
	struct pt_section *section;
	uint64_t laddr;
	int errcode, status;

	if (!iscache || !buffer || !size)
		return -pte_invalid;

	errcode = pt_iscache_lookup(iscache, &section, &laddr, isid);
	if (errcode < 0)
		return errcode;

	if (vaddr < laddr) {
		(void) pt_section_put(section);
		return -pte_nomap;
	}

	vaddr -= laddr;

	errcode = pt_section_map(section);
	if (errcode < 0) {
		(void) pt_section_put(section);
		return errcode;
	}

	/* We truncate the read if it gets too big.  The user is expected to
	 * issue further reads for the remaining part.
	 */
	if (UINT16_MAX < size)
		size = UINT16_MAX;

	status = pt_section_read(section, buffer, (uint16_t) size, vaddr);

	errcode = pt_section_unmap(section);
	if (errcode < 0) {
		(void) pt_section_put(section);
		return errcode;
	}

	errcode = pt_section_put(section);
	if (errcode < 0)
		return errcode;

	return status;
}