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/*
* linux/include/asm-arm/arch-sa1100/memory.h
*
* Copyright (C) 1999-2000 Nicolas Pitre <nico@cam.org>
*/
#ifndef __ASM_ARCH_MEMORY_H
#define __ASM_ARCH_MEMORY_H
#include <linux/config.h>
#include <asm/sizes.h>
/*
* Physical DRAM offset is 0xc0000000 on the SA1100
*/
#define PHYS_OFFSET (0xc0000000UL)
#ifndef __ASSEMBLY__
#ifdef CONFIG_SA1111
static inline void
__arch_adjust_zones(int node, unsigned long *size, unsigned long *holes)
{
unsigned int sz = SZ_1M >> PAGE_SHIFT;
if (node != 0)
sz = 0;
size[1] = size[0] - sz;
size[0] = sz;
}
#define arch_adjust_zones(node, size, holes) \
__arch_adjust_zones(node, size, holes)
#define ISA_DMA_THRESHOLD (PHYS_OFFSET + SZ_1M - 1)
#endif
#endif
/*
* Virtual view <-> DMA view memory address translations
* virt_to_bus: Used to translate the virtual address to an
* address suitable to be passed to set_dma_addr
* bus_to_virt: Used to convert an address for DMA operations
* to an address that the kernel can use.
*
* On the SA1100, bus addresses are equivalent to physical addresses.
*/
#define __virt_to_bus(x) __virt_to_phys(x)
#define __bus_to_virt(x) __phys_to_virt(x)
#ifdef CONFIG_DISCONTIGMEM
/*
* Because of the wide memory address space between physical RAM banks on the
* SA1100, it's much convenient to use Linux's NUMA support to implement our
* memory map representation. Assuming all memory nodes have equal access
* characteristics, we then have generic discontiguous memory support.
*
* Of course, all this isn't mandatory for SA1100 implementations with only
* one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM.
*
* The nodes are matched with the physical memory bank addresses which are
* incidentally the same as virtual addresses.
*
* node 0: 0xc0000000 - 0xc7ffffff
* node 1: 0xc8000000 - 0xcfffffff
* node 2: 0xd0000000 - 0xd7ffffff
* node 3: 0xd8000000 - 0xdfffffff
*/
/*
* Given a kernel address, find the home node of the underlying memory.
*/
#define KVADDR_TO_NID(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> 27)
/*
* Given a page frame number, convert it to a node id.
*/
#define PFN_TO_NID(pfn) (((pfn) - PHYS_PFN_OFFSET) >> (27 - PAGE_SHIFT))
/*
* Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
* and return the mem_map of that node.
*/
#define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
/*
* Given a page frame number, find the owning node of the memory
* and return the mem_map of that node.
*/
#define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
/*
* Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
* and returns the index corresponding to the appropriate page in the
* node's mem_map.
*/
#define LOCAL_MAP_NR(addr) \
(((unsigned long)(addr) & 0x07ffffff) >> PAGE_SHIFT)
#else
#define PFN_TO_NID(addr) (0)
#endif
#endif
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