1 files changed, 144 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
new file mode 100644
index 000000000000..1cac16a001cb
--- /dev/null
+++ b/arch/arm64/include/asm/memory.h
@@ -0,0 +1,144 @@
+/*
+ * Based on arch/arm/include/asm/memory.h
+ *
+ * Copyright (C) 2000-2002 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Note: this file should not be included by non-asm/.h files
+ */
+#ifndef __ASM_MEMORY_H
+#define __ASM_MEMORY_H
+
+#include <linux/compiler.h>
+#include <linux/const.h>
+#include <linux/types.h>
+#include <asm/sizes.h>
+
+/*
+ * Allow for constants defined here to be used from assembly code
+ * by prepending the UL suffix only with actual C code compilation.
+ */
+#define UL(x) _AC(x, UL)
+
+/*
+ * PAGE_OFFSET - the virtual address of the start of the kernel image.
+ * VA_BITS - the maximum number of bits for virtual addresses.
+ * TASK_SIZE - the maximum size of a user space task.
+ * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
+ * The module space lives between the addresses given by TASK_SIZE
+ * and PAGE_OFFSET - it must be within 128MB of the kernel text.
+ */
+#define PAGE_OFFSET             UL(0xffffffc000000000)
+#define MODULES_END             (PAGE_OFFSET)
+#define MODULES_VADDR           (MODULES_END - SZ_64M)
+#define VA_BITS                 (39)
+#define TASK_SIZE_64            (UL(1) << VA_BITS)
+
+#ifdef CONFIG_COMPAT
+#define TASK_SIZE_32            UL(0x100000000)
+#define TASK_SIZE               (test_thread_flag(TIF_32BIT) ? \
+                                TASK_SIZE_32 : TASK_SIZE_64)
+#else
+#define TASK_SIZE               TASK_SIZE_64
+#endif /* CONFIG_COMPAT */
+
+#define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 4))
+
+#if TASK_SIZE_64 > MODULES_VADDR
+#error Top of 64-bit user space clashes with start of module space
+#endif
+
+/*
+ * Physical vs virtual RAM address space conversion.  These are
+ * private definitions which should NOT be used outside memory.h
+ * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
+ */
+#define __virt_to_phys(x)       (((phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET))
+#define __phys_to_virt(x)       ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET))
+
+/*
+ * Convert a physical address to a Page Frame Number and back
+ */
+#define __phys_to_pfn(paddr)    ((unsigned long)((paddr) >> PAGE_SHIFT))
+#define __pfn_to_phys(pfn)      ((phys_addr_t)(pfn) << PAGE_SHIFT)
+
+/*
+ * Convert a page to/from a physical address
+ */
+#define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
+#define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
+
+/*
+ * Memory types available.
+ */
+#define MT_DEVICE_nGnRnE        0
+#define MT_DEVICE_nGnRE         1
+#define MT_DEVICE_GRE           2
+#define MT_NORMAL_NC            3
+#define MT_NORMAL               4
+
+#ifndef __ASSEMBLY__
+
+extern phys_addr_t              memstart_addr;
+/* PHYS_OFFSET - the physical address of the start of memory. */
+#define PHYS_OFFSET             ({ memstart_addr; })
+
+/*
+ * PFNs are used to describe any physical page; this means
+ * PFN 0 == physical address 0.
+ *
+ * This is the PFN of the first RAM page in the kernel
+ * direct-mapped view.  We assume this is the first page
+ * of RAM in the mem_map as well.
+ */
+#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
+
+/*
+ * Note: Drivers should NOT use these.  They are the wrong
+ * translation for translating DMA addresses.  Use the driver
+ * DMA support - see dma-mapping.h.
+ */
+static inline phys_addr_t virt_to_phys(const volatile void *x)
+{
+        return __virt_to_phys((unsigned long)(x));
+}
+
+static inline void *phys_to_virt(phys_addr_t x)
+{
+        return (void *)(__phys_to_virt(x));
+}
+
+/*
+ * Drivers should NOT use these either.
+ */
+#define __pa(x)                 __virt_to_phys((unsigned long)(x))
+#define __va(x)                 ((void *)__phys_to_virt((phys_addr_t)(x)))
+#define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
+
+/*
+ *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
+ *  virt_addr_valid(k)  indicates whether a virtual address is valid
+ */
+#define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
+
+#define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
+#define virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
+                                 ((void *)(kaddr) < (void *)high_memory))
+
+#endif
+
+#include <asm-generic/memory_model.h>
+
+#endif