2 * linux/include/asm-arm/arch-sa1100/memory.h
4 * Copyright (C) 1999-2000 Nicolas Pitre <nico@cam.org>
7 #ifndef __ASM_ARCH_MEMORY_H
8 #define __ASM_ARCH_MEMORY_H
10 #include <asm/sizes.h>
13 * Physical DRAM offset is 0xc0000000 on the SA1100
15 #define PHYS_OFFSET UL(0xc0000000)
20 void sa1111_adjust_zones(int node, unsigned long *size, unsigned long *holes);
22 #define arch_adjust_zones(node, size, holes) \
23 sa1111_adjust_zones(node, size, holes)
25 #define ISA_DMA_THRESHOLD (PHYS_OFFSET + SZ_1M - 1)
31 * Virtual view <-> DMA view memory address translations
32 * virt_to_bus: Used to translate the virtual address to an
33 * address suitable to be passed to set_dma_addr
34 * bus_to_virt: Used to convert an address for DMA operations
35 * to an address that the kernel can use.
37 * On the SA1100, bus addresses are equivalent to physical addresses.
39 #define __virt_to_bus(x) __virt_to_phys(x)
40 #define __bus_to_virt(x) __phys_to_virt(x)
42 #ifdef CONFIG_DISCONTIGMEM
44 * Because of the wide memory address space between physical RAM banks on the
45 * SA1100, it's much convenient to use Linux's NUMA support to implement our
46 * memory map representation. Assuming all memory nodes have equal access
47 * characteristics, we then have generic discontiguous memory support.
49 * Of course, all this isn't mandatory for SA1100 implementations with only
50 * one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM.
52 * The nodes are matched with the physical memory bank addresses which are
53 * incidentally the same as virtual addresses.
55 * node 0: 0xc0000000 - 0xc7ffffff
56 * node 1: 0xc8000000 - 0xcfffffff
57 * node 2: 0xd0000000 - 0xd7ffffff
58 * node 3: 0xd8000000 - 0xdfffffff
62 * Given a kernel address, find the home node of the underlying memory.
64 #define KVADDR_TO_NID(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> 27)
67 * Given a page frame number, convert it to a node id.
69 #define PFN_TO_NID(pfn) (((pfn) - PHYS_PFN_OFFSET) >> (27 - PAGE_SHIFT))
72 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
73 * and return the mem_map of that node.
75 #define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
78 * Given a page frame number, find the owning node of the memory
79 * and return the mem_map of that node.
81 #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
84 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
85 * and returns the index corresponding to the appropriate page in the
88 #define LOCAL_MAP_NR(addr) \
89 (((unsigned long)(addr) & 0x07ffffff) >> PAGE_SHIFT)
94 * Cache flushing area - SA1100 zero bank
96 #define FLUSH_BASE_PHYS 0xe0000000
97 #define FLUSH_BASE 0xf5000000
98 #define FLUSH_BASE_MINICACHE 0xf5100000