aboutsummaryrefslogtreecommitdiffstats
path: root/arch/unicore32/include/asm/memory.h
diff options
context:
space:
mode:
authorGuanXuetao <gxt@mprc.pku.edu.cn>2011-01-15 18:16:59 +0800
committerGuanXuetao <gxt@mprc.pku.edu.cn>2011-03-17 09:19:08 +0800
commitb50f1704e9c441c58cf6dc05e72953ca30e1d4d2 (patch)
treebfd7f81c849aa42f6355d9fb383f2167c5f0e087 /arch/unicore32/include/asm/memory.h
parentunicore32 core architecture: process/thread related codes (diff)
downloadlinux-dev-b50f1704e9c441c58cf6dc05e72953ca30e1d4d2.tar.xz
linux-dev-b50f1704e9c441c58cf6dc05e72953ca30e1d4d2.zip
unicore32 core architecture: mm related: generic codes
This patch includes generic codes for memory management. Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to '')
-rw-r--r--arch/unicore32/include/asm/memory.h123
1 files changed, 123 insertions, 0 deletions
diff --git a/arch/unicore32/include/asm/memory.h b/arch/unicore32/include/asm/memory.h
new file mode 100644
index 000000000000..5eddb997defe
--- /dev/null
+++ b/arch/unicore32/include/asm/memory.h
@@ -0,0 +1,123 @@
+/*
+ * linux/arch/unicore32/include/asm/memory.h
+ *
+ * Code specific to PKUnity SoC and UniCore ISA
+ *
+ * Copyright (C) 2001-2010 GUAN Xue-tao
+ *
+ * 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.
+ *
+ * Note: this file should not be included by non-asm/.h files
+ */
+#ifndef __UNICORE_MEMORY_H__
+#define __UNICORE_MEMORY_H__
+
+#include <linux/compiler.h>
+#include <linux/const.h>
+#include <asm/sizes.h>
+#include <mach/memory.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
+ * TASK_SIZE - the maximum size of a user space task.
+ * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
+ */
+#define PAGE_OFFSET UL(0xC0000000)
+#define TASK_SIZE (PAGE_OFFSET - UL(0x41000000))
+#define TASK_UNMAPPED_BASE (PAGE_OFFSET / 3)
+
+/*
+ * The module space lives between the addresses given by TASK_SIZE
+ * and PAGE_OFFSET - it must be within 32MB of the kernel text.
+ */
+#define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024)
+#if TASK_SIZE > MODULES_VADDR
+#error Top of user space clashes with start of module space
+#endif
+
+#define MODULES_END (PAGE_OFFSET)
+
+/*
+ * Allow 16MB-aligned ioremap pages
+ */
+#define IOREMAP_MAX_ORDER 24
+
+/*
+ * 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.
+ */
+#ifndef __virt_to_phys
+#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
+#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
+#endif
+
+/*
+ * Convert a physical address to a Page Frame Number and back
+ */
+#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
+#define __pfn_to_phys(pfn) ((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)))
+
+#ifndef __ASSEMBLY__
+
+#ifndef arch_adjust_zones
+#define arch_adjust_zones(size, holes) do { } while (0)
+#endif
+
+/*
+ * 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)
+
+/*
+ * Drivers should NOT use these either.
+ */
+#define __pa(x) __virt_to_phys((unsigned long)(x))
+#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
+#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
+
+/*
+ * Conversion between a struct page and a physical address.
+ *
+ * Note: when converting an unknown physical address to a
+ * struct page, the resulting pointer must be validated
+ * using VALID_PAGE(). It must return an invalid struct page
+ * for any physical address not corresponding to a system
+ * RAM address.
+ *
+ * page_to_pfn(page) convert a struct page * to a PFN number
+ * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
+ *
+ * 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) ((unsigned long)(kaddr) >= PAGE_OFFSET && \
+ (unsigned long)(kaddr) < (unsigned long)high_memory)
+
+#endif
+
+#include <asm-generic/memory_model.h>
+
+#endif