2 * linux/include/asm-arm/arch-s3c2400/memory.h by garyj@denx.de
4 * linux/include/asm-arm/arch-sa1100/memory.h
6 * Copyright (c) 1999 Nicolas Pitre <nico@visuaide.com>
9 #ifndef __ASM_ARCH_MEMORY_H
10 #define __ASM_ARCH_MEMORY_H
16 #define TASK_SIZE (0xc0000000UL)
17 #define TASK_SIZE_26 (0x04000000UL)
20 * This decides where the kernel will search for a free chunk of vm
21 * space during mmap's.
23 #define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
28 #define PAGE_OFFSET (0xc0000000UL)
31 * Physical DRAM offset is 0x0c000000 on the S3C2400
33 #define PHYS_OFFSET (0x0c000000UL)
35 /* Modified for S3C2400, by chc, 20010509 */
36 #define RAM_IN_BANK_0 32*1024*1024
37 #define RAM_IN_BANK_1 0
38 #define RAM_IN_BANK_2 0
39 #define RAM_IN_BANK_3 0
41 #define MEM_SIZE (RAM_IN_BANK_0+RAM_IN_BANK_1+RAM_IN_BANK_2+RAM_IN_BANK_3)
44 /* translation macros */
45 #define __virt_to_phys__is_a_macro
46 #define __phys_to_virt__is_a_macro
48 #if (RAM_IN_BANK_1 + RAM_IN_BANK_2 + RAM_IN_BANK_3 == 0)
50 #define __virt_to_phys(x) ( (x) - PAGE_OFFSET + 0x0c000000 )
51 #define __phys_to_virt(x) ( (x) - 0x0c000000 + PAGE_OFFSET )
53 #elif (RAM_IN_BANK_0 == RAM_IN_BANK_1) && \
54 (RAM_IN_BANK_2 + RAM_IN_BANK_3 == 0)
56 /* Two identical banks */
57 #define __virt_to_phys(x) \
58 ( ((x) < PAGE_OFFSET+RAM_IN_BANK_0) ? \
59 ((x) - PAGE_OFFSET + _DRAMBnk0) : \
60 ((x) - PAGE_OFFSET - RAM_IN_BANK_0 + _DRAMBnk1) )
61 #define __phys_to_virt(x) \
62 ( ((x)&0x07ffffff) + \
63 (((x)&0x08000000) ? PAGE_OFFSET+RAM_IN_BANK_0 : PAGE_OFFSET) )
66 /* It's more efficient for all other cases to use the function call */
67 #undef __virt_to_phys__is_a_macro
68 #undef __phys_to_virt__is_a_macro
69 extern unsigned long __virt_to_phys(unsigned long vpage);
70 extern unsigned long __phys_to_virt(unsigned long ppage);
75 * Virtual view <-> DMA view memory address translations
76 * virt_to_bus: Used to translate the virtual address to an
77 * address suitable to be passed to set_dma_addr
78 * bus_to_virt: Used to convert an address for DMA operations
79 * to an address that the kernel can use.
81 * On the SA1100, bus addresses are equivalent to physical addresses.
83 #define __virt_to_bus__is_a_macro
84 #define __virt_to_bus(x) __virt_to_phys(x)
85 #define __bus_to_virt__is_a_macro
86 #define __bus_to_virt(x) __phys_to_virt(x)
89 #ifdef CONFIG_DISCONTIGMEM
90 #error "CONFIG_DISCONTIGMEM will not work on S3C2400"
92 * Because of the wide memory address space between physical RAM banks on the
93 * SA1100, it's much more convenient to use Linux's NUMA support to implement
94 * our memory map representation. Assuming all memory nodes have equal access
95 * characteristics, we then have generic discontiguous memory support.
97 * Of course, all this isn't mandatory for SA1100 implementations with only
98 * one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM.
100 * The nodes are matched with the physical memory bank addresses which are
101 * incidentally the same as virtual addresses.
103 * node 0: 0xc0000000 - 0xc7ffffff
104 * node 1: 0xc8000000 - 0xcfffffff
105 * node 2: 0xd0000000 - 0xd7ffffff
106 * node 3: 0xd8000000 - 0xdfffffff
112 * Given a kernel address, find the home node of the underlying memory.
114 #define KVADDR_TO_NID(addr) \
115 (((unsigned long)(addr) - 0xc0000000) >> 27)
118 * Given a physical address, convert it to a node id.
120 #define PHYS_TO_NID(addr) KVADDR_TO_NID(__phys_to_virt(addr))
123 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
124 * and returns the mem_map of that node.
126 #define ADDR_TO_MAPBASE(kaddr) \
127 NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr)))
130 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
131 * and returns the index corresponding to the appropriate page in the
134 #define LOCAL_MAP_NR(kvaddr) \
135 (((unsigned long)(kvaddr) & 0x07ffffff) >> PAGE_SHIFT)
138 * Given a kaddr, virt_to_page returns a pointer to the corresponding
141 #define virt_to_page(kaddr) \
142 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
145 * VALID_PAGE returns a non-zero value if given page pointer is valid.
146 * This assumes all node's mem_maps are stored within the node they refer to.
148 #define VALID_PAGE(page) \
149 ({ unsigned int node = KVADDR_TO_NID(page); \
150 ( (node < NR_NODES) && \
151 ((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size) ); \
156 #define PHYS_TO_NID(addr) (0)
159 #endif /* __ASM_ARCH_MEMORY_H */