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f09b997999
Patch from Nicolas Pitre This patch allows for assorted type of cleanups by letting assembly code use the same set of defines for constant values and avoid duplicated definitions that might not always be in sync, or that might simply be confusing due to the different names for the same thing. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
/*
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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 UL(0xc0000000)
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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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