Attachment 151665 Details for Bug 234069 – backport ioremap_page_range()

[patch] backport ioremap_page_range()

ioremap (text/plain), 3.47 KB, created by Bjorn Helgaas on 2007-04-04 15:27:20 UTC

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Creator: Bjorn Helgaas

Created: 2007-04-04 15:27:20 UTC

Size: 3.47 KB

patch

obsolete

>Index: linux-2.6.18.ia64/include/linux/io.h
>===================================================================
>--- linux-2.6.18.ia64.orig/include/linux/io.h	2006-09-19 21:42:06.000000000 -0600
>+++ linux-2.6.18.ia64/include/linux/io.h	2007-03-23 06:52:39.000000000 -0600
>@@ -19,8 +19,12 @@
> #define _LINUX_IO_H
> 
> #include <asm/io.h>
>+#include <asm/page.h>
> 
> void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
> void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
> 
>+int ioremap_page_range(unsigned long addr, unsigned long end,
>+		       unsigned long phys_addr, pgprot_t prot);
>+
> #endif /* _LINUX_IO_H */
>Index: linux-2.6.18.ia64/lib/ioremap.c
>===================================================================
>--- /dev/null	1970-01-01 00:00:00.000000000 +0000
>+++ linux-2.6.18.ia64/lib/ioremap.c	2007-03-23 06:51:44.000000000 -0600
>@@ -0,0 +1,91 @@
>+/*
>+ * Re-map IO memory to kernel address space so that we can access it.
>+ * This is needed for high PCI addresses that aren't mapped in the
>+ * 640k-1MB IO memory area on PC's
>+ *
>+ * (C) Copyright 1995 1996 Linus Torvalds
>+ */
>+#include <linux/vmalloc.h>
>+#include <linux/mm.h>
>+
>+#include <asm/cacheflush.h>
>+#include <asm/pgtable.h>
>+
>+static int ioremap_pte_range(pmd_t *pmd, unsigned long addr,
>+		unsigned long end, unsigned long phys_addr, pgprot_t prot)
>+{
>+	pte_t *pte;
>+	unsigned long pfn;
>+
>+	pfn = phys_addr >> PAGE_SHIFT;
>+	pte = pte_alloc_kernel(pmd, addr);
>+	if (!pte)
>+		return -ENOMEM;
>+	do {
>+		BUG_ON(!pte_none(*pte));
>+		set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot));
>+		pfn++;
>+	} while (pte++, addr += PAGE_SIZE, addr != end);
>+	return 0;
>+}
>+
>+static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
>+		unsigned long end, unsigned long phys_addr, pgprot_t prot)
>+{
>+	pmd_t *pmd;
>+	unsigned long next;
>+
>+	phys_addr -= addr;
>+	pmd = pmd_alloc(&init_mm, pud, addr);
>+	if (!pmd)
>+		return -ENOMEM;
>+	do {
>+		next = pmd_addr_end(addr, end);
>+		if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot))
>+			return -ENOMEM;
>+	} while (pmd++, addr = next, addr != end);
>+	return 0;
>+}
>+
>+static inline int ioremap_pud_range(pgd_t *pgd, unsigned long addr,
>+		unsigned long end, unsigned long phys_addr, pgprot_t prot)
>+{
>+	pud_t *pud;
>+	unsigned long next;
>+
>+	phys_addr -= addr;
>+	pud = pud_alloc(&init_mm, pgd, addr);
>+	if (!pud)
>+		return -ENOMEM;
>+	do {
>+		next = pud_addr_end(addr, end);
>+		if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot))
>+			return -ENOMEM;
>+	} while (pud++, addr = next, addr != end);
>+	return 0;
>+}
>+
>+int ioremap_page_range(unsigned long addr,
>+		       unsigned long end, unsigned long phys_addr, pgprot_t prot)
>+{
>+	pgd_t *pgd;
>+	unsigned long start;
>+	unsigned long next;
>+	int err;
>+
>+	BUG_ON(addr >= end);
>+
>+	start = addr;
>+	phys_addr -= addr;
>+	pgd = pgd_offset_k(addr);
>+	do {
>+		next = pgd_addr_end(addr, end);
>+		err = ioremap_pud_range(pgd, addr, next, phys_addr+addr, prot);
>+		if (err)
>+			break;
>+	} while (pgd++, addr = next, addr != end);
>+
>+	flush_cache_vmap(start, end);
>+
>+	return err;
>+}
>Index: linux-2.6.18.ia64/lib/Makefile
>===================================================================
>--- linux-2.6.18.ia64.orig/lib/Makefile	2007-03-23 05:18:34.000000000 -0600
>+++ linux-2.6.18.ia64/lib/Makefile	2007-03-23 06:54:47.000000000 -0600
>@@ -7,6 +7,7 @@
> 	 idr.o div64.o int_sqrt.o bitmap.o extable.o prio_tree.o \
> 	 sha1.o
> 
>+lib-$(CONFIG_MMU) += ioremap.o
> lib-$(CONFIG_SMP) += cpumask.o
> 
> lib-y	+= kobject.o kref.o kobject_uevent.o klist.o

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Attachments on bug 234069: 151665 | 151666 | 151667 | 151668 | 151669