summaryrefslogtreecommitdiffstats
path: root/arch/arm/include/asm/memory.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/include/asm/memory.h')
-rw-r--r--arch/arm/include/asm/memory.h334
1 files changed, 334 insertions, 0 deletions
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
new file mode 100644
index 000000000000..92069221dca9
--- /dev/null
+++ b/arch/arm/include/asm/memory.h
@@ -0,0 +1,334 @@
+/*
+ * arch/arm/include/asm/memory.h
+ *
+ * Copyright (C) 2000-2002 Russell King
+ * modification for nommu, Hyok S. Choi, 2004
+ *
+ * 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 __ASM_ARM_MEMORY_H
+#define __ASM_ARM_MEMORY_H
+
+/*
+ * Allow for constants defined here to be used from assembly code
+ * by prepending the UL suffix only with actual C code compilation.
+ */
+#ifndef __ASSEMBLY__
+#define UL(x) (x##UL)
+#else
+#define UL(x) (x)
+#endif
+
+#include <linux/compiler.h>
+#include <asm/arch/memory.h>
+#include <asm/sizes.h>
+
+#ifdef CONFIG_MMU
+
+#ifndef TASK_SIZE
+/*
+ * TASK_SIZE - the maximum size of a user space task.
+ * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
+ */
+#define TASK_SIZE UL(0xbf000000)
+#define TASK_UNMAPPED_BASE UL(0x40000000)
+#endif
+
+/*
+ * The maximum size of a 26-bit user space task.
+ */
+#define TASK_SIZE_26 UL(0x04000000)
+
+/*
+ * Page offset: 3GB
+ */
+#ifndef PAGE_OFFSET
+#define PAGE_OFFSET UL(0xc0000000)
+#endif
+
+/*
+ * The module space lives between the addresses given by TASK_SIZE
+ * and PAGE_OFFSET - it must be within 32MB of the kernel text.
+ */
+#define MODULE_END (PAGE_OFFSET)
+#define MODULE_START (MODULE_END - 16*1048576)
+
+#if TASK_SIZE > MODULE_START
+#error Top of user space clashes with start of module space
+#endif
+
+/*
+ * The XIP kernel gets mapped at the bottom of the module vm area.
+ * Since we use sections to map it, this macro replaces the physical address
+ * with its virtual address while keeping offset from the base section.
+ */
+#define XIP_VIRT_ADDR(physaddr) (MODULE_START + ((physaddr) & 0x000fffff))
+
+/*
+ * Allow 16MB-aligned ioremap pages
+ */
+#define IOREMAP_MAX_ORDER 24
+
+#else /* CONFIG_MMU */
+
+/*
+ * The limitation of user task size can grow up to the end of free ram region.
+ * It is difficult to define and perhaps will never meet the original meaning
+ * of this define that was meant to.
+ * Fortunately, there is no reference for this in noMMU mode, for now.
+ */
+#ifndef TASK_SIZE
+#define TASK_SIZE (CONFIG_DRAM_SIZE)
+#endif
+
+#ifndef TASK_UNMAPPED_BASE
+#define TASK_UNMAPPED_BASE UL(0x00000000)
+#endif
+
+#ifndef PHYS_OFFSET
+#define PHYS_OFFSET (CONFIG_DRAM_BASE)
+#endif
+
+#ifndef END_MEM
+#define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
+#endif
+
+#ifndef PAGE_OFFSET
+#define PAGE_OFFSET (PHYS_OFFSET)
+#endif
+
+/*
+ * The module can be at any place in ram in nommu mode.
+ */
+#define MODULE_END (END_MEM)
+#define MODULE_START (PHYS_OFFSET)
+
+#endif /* !CONFIG_MMU */
+
+/*
+ * Size of DMA-consistent memory region. Must be multiple of 2M,
+ * between 2MB and 14MB inclusive.
+ */
+#ifndef CONSISTENT_DMA_SIZE
+#define CONSISTENT_DMA_SIZE SZ_2M
+#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.
+ */
+#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)
+
+#ifndef __ASSEMBLY__
+
+/*
+ * The DMA mask corresponding to the maximum bus address allocatable
+ * using GFP_DMA. The default here places no restriction on DMA
+ * allocations. This must be the smallest DMA mask in the system,
+ * so a successful GFP_DMA allocation will always satisfy this.
+ */
+#ifndef ISA_DMA_THRESHOLD
+#define ISA_DMA_THRESHOLD (0xffffffffULL)
+#endif
+
+#ifndef arch_adjust_zones
+#define arch_adjust_zones(node,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)
+
+/*
+ * These are *only* valid on the kernel direct mapped RAM memory.
+ * 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 unsigned long virt_to_phys(void *x)
+{
+ return __virt_to_phys((unsigned long)(x));
+}
+
+static inline void *phys_to_virt(unsigned long x)
+{
+ return (void *)(__phys_to_virt((unsigned long)(x)));
+}
+
+/*
+ * 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)
+
+/*
+ * Virtual <-> DMA view memory address translations
+ * Again, these are *only* valid on the kernel direct mapped RAM
+ * memory. Use of these is *deprecated* (and that doesn't mean
+ * use the __ prefixed forms instead.) See dma-mapping.h.
+ */
+static inline __deprecated unsigned long virt_to_bus(void *x)
+{
+ return __virt_to_bus((unsigned long)x);
+}
+
+static inline __deprecated void *bus_to_virt(unsigned long x)
+{
+ return (void *)__bus_to_virt(x);
+}
+
+/*
+ * 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 *
+ * pfn_valid(pfn) indicates whether a PFN number is valid
+ *
+ * virt_to_page(k) convert a _valid_ virtual address to struct page *
+ * virt_addr_valid(k) indicates whether a virtual address is valid
+ */
+#ifndef CONFIG_DISCONTIGMEM
+
+#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
+
+#ifndef CONFIG_SPARSEMEM
+#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
+#endif
+
+#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)
+
+#define PHYS_TO_NID(addr) (0)
+
+#else /* CONFIG_DISCONTIGMEM */
+
+/*
+ * This is more complex. We have a set of mem_map arrays spread
+ * around in memory.
+ */
+#include <linux/numa.h>
+
+#define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
+#define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
+
+#define pfn_valid(pfn) \
+ ({ \
+ unsigned int nid = PFN_TO_NID(pfn); \
+ int valid = nid < MAX_NUMNODES; \
+ if (valid) { \
+ pg_data_t *node = NODE_DATA(nid); \
+ valid = (pfn - node->node_start_pfn) < \
+ node->node_spanned_pages; \
+ } \
+ valid; \
+ })
+
+#define virt_to_page(kaddr) \
+ (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
+
+#define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
+
+/*
+ * Common discontigmem stuff.
+ * PHYS_TO_NID is used by the ARM kernel/setup.c
+ */
+#define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
+
+/*
+ * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
+ * and returns the mem_map of that node.
+ */
+#define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
+
+/*
+ * Given a page frame number, find the owning node of the memory
+ * and returns the mem_map of that node.
+ */
+#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
+
+#ifdef NODE_MEM_SIZE_BITS
+#define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1)
+
+/*
+ * Given a kernel address, find the home node of the underlying memory.
+ */
+#define KVADDR_TO_NID(addr) \
+ (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
+
+/*
+ * Given a page frame number, convert it to a node id.
+ */
+#define PFN_TO_NID(pfn) \
+ (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
+
+/*
+ * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
+ * and returns the index corresponding to the appropriate page in the
+ * node's mem_map.
+ */
+#define LOCAL_MAP_NR(addr) \
+ (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
+
+#endif /* NODE_MEM_SIZE_BITS */
+
+#endif /* !CONFIG_DISCONTIGMEM */
+
+/*
+ * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
+ */
+#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
+
+/*
+ * Optional device DMA address remapping. Do _not_ use directly!
+ * We should really eliminate virt_to_bus() here - it's deprecated.
+ */
+#ifndef __arch_page_to_dma
+#define page_to_dma(dev, page) ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page)))
+#define dma_to_virt(dev, addr) ((void *)__bus_to_virt(addr))
+#define virt_to_dma(dev, addr) ((dma_addr_t)__virt_to_bus((unsigned long)(addr)))
+#else
+#define page_to_dma(dev, page) (__arch_page_to_dma(dev, page))
+#define dma_to_virt(dev, addr) (__arch_dma_to_virt(dev, addr))
+#define virt_to_dma(dev, addr) (__arch_virt_to_dma(dev, addr))
+#endif
+
+/*
+ * Optional coherency support. Currently used only by selected
+ * Intel XSC3-based systems.
+ */
+#ifndef arch_is_coherent
+#define arch_is_coherent() 0
+#endif
+
+#endif
+
+#include <asm-generic/memory_model.h>
+
+#endif