1 files changed, 104 insertions, 0 deletions
diff --git a/arch/arm/mm/nommu.c b/arch/arm/mm/nommu.c
new file mode 100644
index 00000000..d51225f9
--- /dev/null
+++ b/arch/arm/mm/nommu.c
@@ -0,0 +1,104 @@
+/*
+ *  linux/arch/arm/mm/nommu.c
+ *
+ * ARM uCLinux supporting functions.
+ */
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/io.h>
+#include <linux/memblock.h>
+
+#include <asm/cacheflush.h>
+#include <asm/sections.h>
+#include <asm/page.h>
+#include <asm/setup.h>
+#include <asm/traps.h>
+#include <asm/mach/arch.h>
+
+#include "mm.h"
+
+void __init arm_mm_memblock_reserve(void)
+{
+	/*
+	 * Register the exception vector page.
+	 * some architectures which the DRAM is the exception vector to trap,
+	 * alloc_page breaks with error, although it is not NULL, but "0."
+	 */
+	memblock_reserve(CONFIG_VECTORS_BASE, PAGE_SIZE);
+}
+
+void __init sanity_check_meminfo(void)
+{
+	phys_addr_t end = bank_phys_end(&meminfo.bank[meminfo.nr_banks - 1]);
+	high_memory = __va(end - 1) + 1;
+}
+
+/*
+ * paging_init() sets up the page tables, initialises the zone memory
+ * maps, and sets up the zero page, bad page and bad page tables.
+ */
+void __init paging_init(struct machine_desc *mdesc)
+{
+	early_trap_init((void *)CONFIG_VECTORS_BASE);
+	bootmem_init();
+}
+
+/*
+ * We don't need to do anything here for nommu machines.
+ */
+void setup_mm_for_reboot(void)
+{
+}
+
+void flush_dcache_page(struct page *page)
+{
+	__cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
+}
+EXPORT_SYMBOL(flush_dcache_page);
+
+void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
+		       unsigned long uaddr, void *dst, const void *src,
+		       unsigned long len)
+{
+	memcpy(dst, src, len);
+	if (vma->vm_flags & VM_EXEC)
+		__cpuc_coherent_user_range(uaddr, uaddr + len);
+}
+
+void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
+				size_t size, unsigned int mtype)
+{
+	if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
+		return NULL;
+	return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
+}
+EXPORT_SYMBOL(__arm_ioremap_pfn);
+
+void __iomem *__arm_ioremap_pfn_caller(unsigned long pfn, unsigned long offset,
+			   size_t size, unsigned int mtype, void *caller)
+{
+	return __arm_ioremap_pfn(pfn, offset, size, mtype);
+}
+
+void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size,
+			    unsigned int mtype)
+{
+	return (void __iomem *)phys_addr;
+}
+EXPORT_SYMBOL(__arm_ioremap);
+
+void __iomem * (*arch_ioremap_caller)(unsigned long, size_t, unsigned int, void *);
+
+void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
+				   unsigned int mtype, void *caller)
+{
+	return __arm_ioremap(phys_addr, size, mtype);
+}
+
+void (*arch_iounmap)(volatile void __iomem *);
+
+void __arm_iounmap(volatile void __iomem *addr)
+{
+}
+EXPORT_SYMBOL(__arm_iounmap);