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-rw-r--r--arch/mn10300/include/asm/pgtable.h3
-rw-r--r--arch/mn10300/mm/init.c21
2 files changed, 24 insertions, 0 deletions
diff --git a/arch/mn10300/include/asm/pgtable.h b/arch/mn10300/include/asm/pgtable.h
index cd568bf5407e..a1e894b5f65b 100644
--- a/arch/mn10300/include/asm/pgtable.h
+++ b/arch/mn10300/include/asm/pgtable.h
@@ -182,6 +182,9 @@ extern pte_t kernel_vmalloc_ptes[(VMALLOC_END - VMALLOC_START) / PAGE_SIZE];
#define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
#define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
+#define __PAGE_USERIO (__PAGE_KERNEL_BASE | _PAGE_PROT_WKWU | _PAGE_NX)
+#define PAGE_USERIO __pgprot(__PAGE_USERIO)
+
/*
* Whilst the MN10300 can do page protection for execute (given separate data
* and insn TLBs), we are not supporting it at the moment. Write permission,
diff --git a/arch/mn10300/mm/init.c b/arch/mn10300/mm/init.c
index 1daf97fd7c99..48907cc3bdb7 100644
--- a/arch/mn10300/mm/init.c
+++ b/arch/mn10300/mm/init.c
@@ -41,6 +41,10 @@ DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
unsigned long highstart_pfn, highend_pfn;
+#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
+static struct vm_struct user_iomap_vm;
+#endif
+
/*
* set up paging
*/
@@ -73,6 +77,23 @@ void __init paging_init(void)
/* pass the memory from the bootmem allocator to the main allocator */
free_area_init(zones_size);
+#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
+ /* The Atomic Operation Unit registers need to be mapped to userspace
+ * for all processes. The following uses vm_area_register_early() to
+ * reserve the first page of the vmalloc area and sets the pte for that
+ * page.
+ *
+ * glibc hardcodes this virtual mapping, so we're pretty much stuck with
+ * it from now on.
+ */
+ user_iomap_vm.flags = VM_USERMAP;
+ user_iomap_vm.size = 1 << PAGE_SHIFT;
+ vm_area_register_early(&user_iomap_vm, PAGE_SIZE);
+ ppte = kernel_vmalloc_ptes;
+ set_pte(ppte, pfn_pte(USER_ATOMIC_OPS_PAGE_ADDR >> PAGE_SHIFT,
+ PAGE_USERIO));
+#endif
+
local_flush_tlb_all();
}