include/asm-arm/arch-sa1100/memory.h

   1 /*
   2  * linux/include/asm-arm/arch-sa1100/memory.h
   3  *
   4  * Copyright (C) 1999-2000 Nicolas Pitre <nico@cam.org>
   5  */
   6
   7 #ifndef __ASM_ARCH_MEMORY_H
   8 #define __ASM_ARCH_MEMORY_H
   9
  10 #include <linux/config.h>
  11 #include <asm/sizes.h>
  12
  13 /*
  14  * Physical DRAM offset is 0xc0000000 on the SA1100
  15  */
  16 #define PHYS_OFFSET     (0xc0000000UL)
  17
  18 #ifndef __ASSEMBLY__
  19
  20 #ifdef CONFIG_SA1111
  21 static inline void
  22 __arch_adjust_zones(int node, unsigned long *size, unsigned long *holes)
  23 {
  24         unsigned int sz = SZ_1M >> PAGE_SHIFT;
  25
  26         if (node != 0)
  27                 sz = 0;
  28
  29         size[1] = size[0] - sz;
  30         size[0] = sz;
  31 }
  32
  33 #define arch_adjust_zones(node, size, holes) \
  34         __arch_adjust_zones(node, size, holes)
  35
  36 #define ISA_DMA_THRESHOLD       (PHYS_OFFSET + SZ_1M - 1)
  37
  38 #endif
  39 #endif
  40
  41 /*
  42  * Virtual view <-> DMA view memory address translations
  43  * virt_to_bus: Used to translate the virtual address to an
  44  *              address suitable to be passed to set_dma_addr
  45  * bus_to_virt: Used to convert an address for DMA operations
  46  *              to an address that the kernel can use.
  47  *
  48  * On the SA1100, bus addresses are equivalent to physical addresses.
  49  */
  50 #define __virt_to_bus(x)         __virt_to_phys(x)
  51 #define __bus_to_virt(x)         __phys_to_virt(x)
  52
  53 #ifdef CONFIG_DISCONTIGMEM
  54 /*
  55  * Because of the wide memory address space between physical RAM banks on the
  56  * SA1100, it's much convenient to use Linux's NUMA support to implement our
  57  * memory map representation.  Assuming all memory nodes have equal access
  58  * characteristics, we then have generic discontiguous memory support.
  59  *
  60  * Of course, all this isn't mandatory for SA1100 implementations with only
  61  * one used memory bank.  For those, simply undefine CONFIG_DISCONTIGMEM.
  62  *
  63  * The nodes are matched with the physical memory bank addresses which are
  64  * incidentally the same as virtual addresses.
  65  *
  66  *      node 0:  0xc0000000 - 0xc7ffffff
  67  *      node 1:  0xc8000000 - 0xcfffffff
  68  *      node 2:  0xd0000000 - 0xd7ffffff
  69  *      node 3:  0xd8000000 - 0xdfffffff
  70  */
  71
  72 /*
  73  * Given a kernel address, find the home node of the underlying memory.
  74  */
  75 #define KVADDR_TO_NID(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> 27)
  76
  77 /*
  78  * Given a page frame number, convert it to a node id.
  79  */
  80 #define PFN_TO_NID(pfn)         (((pfn) - PHYS_PFN_OFFSET) >> (27 - PAGE_SHIFT))
  81
  82 /*
  83  * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
  84  * and return the mem_map of that node.
  85  */
  86 #define ADDR_TO_MAPBASE(kaddr)  NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
  87
  88 /*
  89  * Given a page frame number, find the owning node of the memory
  90  * and return the mem_map of that node.
  91  */
  92 #define PFN_TO_MAPBASE(pfn)     NODE_MEM_MAP(PFN_TO_NID(pfn))
  93
  94 /*
  95  * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
  96  * and returns the index corresponding to the appropriate page in the
  97  * node's mem_map.
  98  */
  99 #define LOCAL_MAP_NR(addr) \
 100         (((unsigned long)(addr) & 0x07ffffff) >> PAGE_SHIFT)
 101
 102 #else
 103
 104 #define PFN_TO_NID(addr)        (0)
 105
 106 #endif
 107
 108 #endif