v4.19.13 snapshot.
diff --git a/arch/parisc/mm/ioremap.c b/arch/parisc/mm/ioremap.c
new file mode 100644
index 0000000..92a9b5f
--- /dev/null
+++ b/arch/parisc/mm/ioremap.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * arch/parisc/mm/ioremap.c
+ *
+ * (C) Copyright 1995 1996 Linus Torvalds
+ * (C) Copyright 2001-2006 Helge Deller <deller@gmx.de>
+ * (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
+ */
+
+#include <linux/vmalloc.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <asm/pgalloc.h>
+
+/*
+ * Generic mapping function (not visible outside):
+ */
+
+/*
+ * Remap an arbitrary physical address space into the kernel virtual
+ * address space.
+ *
+ * NOTE! We need to allow non-page-aligned mappings too: we will obviously
+ * have to convert them into an offset in a page-aligned mapping, but the
+ * caller shouldn't need to know that small detail.
+ */
+void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
+{
+ void __iomem *addr;
+ struct vm_struct *area;
+ unsigned long offset, last_addr;
+ pgprot_t pgprot;
+
+#ifdef CONFIG_EISA
+ unsigned long end = phys_addr + size - 1;
+ /* Support EISA addresses */
+ if ((phys_addr >= 0x00080000 && end < 0x000fffff) ||
+ (phys_addr >= 0x00500000 && end < 0x03bfffff)) {
+ phys_addr |= F_EXTEND(0xfc000000);
+ flags |= _PAGE_NO_CACHE;
+ }
+#endif
+
+ /* Don't allow wraparound or zero size */
+ last_addr = phys_addr + size - 1;
+ if (!size || last_addr < phys_addr)
+ return NULL;
+
+ /*
+ * Don't allow anybody to remap normal RAM that we're using..
+ */
+ if (phys_addr < virt_to_phys(high_memory)) {
+ char *t_addr, *t_end;
+ struct page *page;
+
+ t_addr = __va(phys_addr);
+ t_end = t_addr + (size - 1);
+
+ for (page = virt_to_page(t_addr);
+ page <= virt_to_page(t_end); page++) {
+ if(!PageReserved(page))
+ return NULL;
+ }
+ }
+
+ pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY |
+ _PAGE_ACCESSED | flags);
+
+ /*
+ * Mappings have to be page-aligned
+ */
+ offset = phys_addr & ~PAGE_MASK;
+ phys_addr &= PAGE_MASK;
+ size = PAGE_ALIGN(last_addr + 1) - phys_addr;
+
+ /*
+ * Ok, go for it..
+ */
+ area = get_vm_area(size, VM_IOREMAP);
+ if (!area)
+ return NULL;
+
+ addr = (void __iomem *) area->addr;
+ if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
+ phys_addr, pgprot)) {
+ vfree(addr);
+ return NULL;
+ }
+
+ return (void __iomem *) (offset + (char __iomem *)addr);
+}
+EXPORT_SYMBOL(__ioremap);
+
+void iounmap(const volatile void __iomem *addr)
+{
+ if (addr > high_memory)
+ return vfree((void *) (PAGE_MASK & (unsigned long __force) addr));
+}
+EXPORT_SYMBOL(iounmap);