From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- include/asm-arm/arch-sa1100/memory.h | 108 +++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) create mode 100644 include/asm-arm/arch-sa1100/memory.h (limited to 'include/asm-arm/arch-sa1100/memory.h') diff --git a/include/asm-arm/arch-sa1100/memory.h b/include/asm-arm/arch-sa1100/memory.h new file mode 100644 index 0000000..32d3d5b --- /dev/null +++ b/include/asm-arm/arch-sa1100/memory.h @@ -0,0 +1,108 @@ +/* + * linux/include/asm-arm/arch-sa1100/memory.h + * + * Copyright (C) 1999-2000 Nicolas Pitre + */ + +#ifndef __ASM_ARCH_MEMORY_H +#define __ASM_ARCH_MEMORY_H + +#include +#include + +/* + * 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 -- cgit v1.1