efHeterogeneousSynchronization alarmDataOperation.c 袁明明 commit at 2021-04-09

efHeterogeneousSynchronization/databaseOperation/alarmDataOperation.c

@@ -476,3 +476,55 @@ titan_ioremap(unsigned long addr, unsigned long size)
 		if (hose->index == h)
 			break;
 	if (!hose)
+		return NULL;
+
+	/*
+	 * Is it direct-mapped?
+	 */
+	if ((baddr >= __direct_map_base) && 
+	    ((baddr + size - 1) < __direct_map_base + __direct_map_size)) {
+		vaddr = addr - __direct_map_base + TITAN_MEM_BIAS;
+		return (void __iomem *) vaddr;
+	}
+
+	/* 
+	 * Check the scatter-gather arena.
+	 */
+	if (hose->sg_pci &&
+	    baddr >= (unsigned long)hose->sg_pci->dma_base &&
+	    last < (unsigned long)hose->sg_pci->dma_base + hose->sg_pci->size){
+
+		/*
+		 * Adjust the limits (mappings must be page aligned)
+		 */
+		baddr -= hose->sg_pci->dma_base;
+		last -= hose->sg_pci->dma_base;
+		baddr &= PAGE_MASK;
+		size = PAGE_ALIGN(last) - baddr;
+
+		/*
+		 * Map it
+		 */
+		area = get_vm_area(size, VM_IOREMAP);
+		if (!area) {
+			printk("ioremap failed... no vm_area...\n");
+			return NULL;
+		}
+
+		ptes = hose->sg_pci->ptes;
+		for (vaddr = (unsigned long)area->addr; 
+		    baddr <= last; 
+		    baddr += PAGE_SIZE, vaddr += PAGE_SIZE) {
+			pfn = ptes[baddr >> PAGE_SHIFT];
+			if (!(pfn & 1)) {
+				printk("ioremap failed... pte not valid...\n");
+				vfree(area->addr);
+				return NULL;
+			}
+			pfn >>= 1;	/* make it a true pfn */
+			
+			if (__alpha_remap_area_pages(vaddr,
+						     pfn << PAGE_SHIFT, 
+						     PAGE_SIZE, 0)) {
+				printk("FAILED to remap_area_pages...\n");
+				vfree(area->addr);