163 lines
4.5 KiB
C
163 lines
4.5 KiB
C
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/*
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* linux/include/asm-arm/arch-s3c2400/memory.h by gj@denx.de
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* based on
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* linux/include/asm-arm/arch-sa1100/memory.h
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*
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* Copyright (c) 1999 Nicolas Pitre <nico@visuaide.com>
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*/
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#ifndef __ASM_ARCH_MEMORY_H
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#define __ASM_ARCH_MEMORY_H
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/*
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* Task size: 3GB
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*/
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#define TASK_SIZE (0xc0000000UL)
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#define TASK_SIZE_26 (0x04000000UL)
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/*
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* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
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/*
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* Page offset: 3GB
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*/
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#define PAGE_OFFSET (0xc0000000UL)
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/*
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* Physical DRAM offset is 0x0c000000 on the S3C2400
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*/
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#define PHYS_OFFSET (0x0c000000UL)
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#include <linux/config.h>
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/* Modified for S3C2400, by chc, 20010509 */
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#define RAM_IN_BANK_0 32*1024*1024
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#define RAM_IN_BANK_1 0
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#define RAM_IN_BANK_2 0
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#define RAM_IN_BANK_3 0
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#define MEM_SIZE (RAM_IN_BANK_0+RAM_IN_BANK_1+RAM_IN_BANK_2+RAM_IN_BANK_3)
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/* translation macros */
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#define __virt_to_phys__is_a_macro
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#define __phys_to_virt__is_a_macro
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#if (RAM_IN_BANK_1 + RAM_IN_BANK_2 + RAM_IN_BANK_3 == 0)
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#define __virt_to_phys(x) ( (x) - PAGE_OFFSET + 0x0c000000 )
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#define __phys_to_virt(x) ( (x) - 0x0c000000 + PAGE_OFFSET )
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#elif (RAM_IN_BANK_0 == RAM_IN_BANK_1) && \
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(RAM_IN_BANK_2 + RAM_IN_BANK_3 == 0)
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/* Two identical banks */
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#define __virt_to_phys(x) \
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( ((x) < PAGE_OFFSET+RAM_IN_BANK_0) ? \
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((x) - PAGE_OFFSET + _DRAMBnk0) : \
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((x) - PAGE_OFFSET - RAM_IN_BANK_0 + _DRAMBnk1) )
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#define __phys_to_virt(x) \
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( ((x)&0x07ffffff) + \
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(((x)&0x08000000) ? PAGE_OFFSET+RAM_IN_BANK_0 : PAGE_OFFSET) )
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#else
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/* It's more efficient for all other cases to use the function call */
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#undef __virt_to_phys__is_a_macro
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#undef __phys_to_virt__is_a_macro
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extern unsigned long __virt_to_phys(unsigned long vpage);
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extern unsigned long __phys_to_virt(unsigned long ppage);
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#endif
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/*
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* Virtual view <-> DMA view memory address translations
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* virt_to_bus: Used to translate the virtual address to an
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* address suitable to be passed to set_dma_addr
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* bus_to_virt: Used to convert an address for DMA operations
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* to an address that the kernel can use.
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*
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* On the SA1100, bus addresses are equivalent to physical addresses.
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*/
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#define __virt_to_bus__is_a_macro
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#define __virt_to_bus(x) __virt_to_phys(x)
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#define __bus_to_virt__is_a_macro
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#define __bus_to_virt(x) __phys_to_virt(x)
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#ifdef CONFIG_DISCONTIGMEM
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#error "CONFIG_DISCONTIGMEM will not work on S3C2400"
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/*
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* Because of the wide memory address space between physical RAM banks on the
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* SA1100, it's much more convenient to use Linux's NUMA support to implement
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* our memory map representation. Assuming all memory nodes have equal access
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* characteristics, we then have generic discontiguous memory support.
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*
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* Of course, all this isn't mandatory for SA1100 implementations with only
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* one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM.
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*
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* The nodes are matched with the physical memory bank addresses which are
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* incidentally the same as virtual addresses.
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*
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* node 0: 0xc0000000 - 0xc7ffffff
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* node 1: 0xc8000000 - 0xcfffffff
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* node 2: 0xd0000000 - 0xd7ffffff
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* node 3: 0xd8000000 - 0xdfffffff
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*/
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#define NR_NODES 4
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/*
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* Given a kernel address, find the home node of the underlying memory.
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*/
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#define KVADDR_TO_NID(addr) \
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(((unsigned long)(addr) - 0xc0000000) >> 27)
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/*
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* Given a physical address, convert it to a node id.
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*/
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#define PHYS_TO_NID(addr) KVADDR_TO_NID(__phys_to_virt(addr))
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/*
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* Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
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* and returns the mem_map of that node.
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*/
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#define ADDR_TO_MAPBASE(kaddr) \
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NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr)))
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/*
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* Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
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* and returns the index corresponding to the appropriate page in the
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* node's mem_map.
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*/
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#define LOCAL_MAP_NR(kvaddr) \
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(((unsigned long)(kvaddr) & 0x07ffffff) >> PAGE_SHIFT)
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/*
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* Given a kaddr, virt_to_page returns a pointer to the corresponding
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* mem_map entry.
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*/
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#define virt_to_page(kaddr) \
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(ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
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/*
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* VALID_PAGE returns a non-zero value if given page pointer is valid.
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* This assumes all node's mem_maps are stored within the node they refer to.
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*/
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#define VALID_PAGE(page) \
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({ unsigned int node = KVADDR_TO_NID(page); \
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( (node < NR_NODES) && \
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((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size) ); \
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})
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#else
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#define PHYS_TO_NID(addr) (0)
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#endif
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#endif /* __ASM_ARCH_MEMORY_H */
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