Function dcache_inv_poc

freebsd/arm/include/cpu-v6.h:534–549

* Invalidate D-cache to PoC * * Caches are invalidated from outermost to innermost as fresh cachelines * flow in this direction. In given range, if there was no dirty cacheline * in any cache before, no stale cacheline should remain in them after this * operation finishes. */

 * operation finishes.
 */
static __inline void
dcache_inv_poc(vm_offset_t va, vm_paddr_t pa, vm_size_t size)
{
	vm_offset_t eva = va + size;

	dsb();
	/* invalidate L2 first */
	cpu_l2cache_inv_range(pa, size);

	/* then L1 */
	va &= ~cpuinfo.dcache_line_mask;
	for ( ; va < eva; va += cpuinfo.dcache_line_size) {
		_CP15_DCIMVAC(va);
	}
	dsb();
}

/*
 * Discard D-cache lines to PoC, prior to overwrite by DMA engine.