105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
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/*
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* linux/include/asm-arm/arch-sa1100/memory.h
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*
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* Copyright (C) 1999-2000 Nicolas Pitre <nico@cam.org>
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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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#include <linux/config.h>
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#include <asm/sizes.h>
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/*
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* Physical DRAM offset is 0xc0000000 on the SA1100
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*/
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#define PHYS_OFFSET (0xc0000000UL)
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_SA1111
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static inline void
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__arch_adjust_zones(int node, unsigned long *size, unsigned long *holes)
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{
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unsigned int sz = SZ_1M >> PAGE_SHIFT;
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if (node != 0)
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sz = 0;
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size[1] = size[0] - sz;
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size[0] = sz;
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}
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#define arch_adjust_zones(node, size, holes) \
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__arch_adjust_zones(node, size, holes)
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#define ISA_DMA_THRESHOLD (PHYS_OFFSET + SZ_1M - 1)
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#endif
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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(x) __virt_to_phys(x)
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#define __bus_to_virt(x) __phys_to_virt(x)
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#ifdef CONFIG_DISCONTIGMEM
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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 convenient to use Linux's NUMA support to implement our
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* 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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/*
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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) (((unsigned long)(addr) - PAGE_OFFSET) >> 27)
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/*
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* Given a page frame number, convert it to a node id.
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*/
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#define PFN_TO_NID(pfn) (((pfn) - PHYS_PFN_OFFSET) >> (27 - PAGE_SHIFT))
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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 return the mem_map of that node.
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*/
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#define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
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/*
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* Given a page frame number, find the owning node of the memory
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* and return the mem_map of that node.
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*/
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#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
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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(addr) \
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(((unsigned long)(addr) & 0x07ffffff) >> PAGE_SHIFT)
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#endif
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#endif
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