patch-2.4.22 linux-2.4.22/include/asm-arm/arch-riscstation/memory.h

• Lines: 134
• Date: 2003-08-25 04:44:43.000000000 -0700
• Orig file: linux-2.4.21/include/asm-arm/arch-riscstation/memory.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/include/asm-arm/arch-riscstation/memory.h linux-2.4.22/include/asm-arm/arch-riscstation/memory.h
@@ -0,0 +1,133 @@
+/*
+ *  linux/include/asm-arm/arch-clps711x/mmu.h
+ *
+ *  Copyright (C) 1999 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#ifndef __ASM_ARCH_MMU_H
+#define __ASM_ARCH_MMU_H
+
+#include <linux/config.h>
+
+/*
+ * Task size: 3GB
+ */
+#define TASK_SIZE	(0xc0000000UL)
+#define TASK_SIZE_26	(0x04000000UL)
+
+/*
+ * This decides where the kernel will search for a free chunk of vm
+ * space during mmap's.
+ */
+#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
+
+/*
+ * Page offset: 3GB
+ */
+#define PAGE_OFFSET	(0xc0000000UL)
+#define PHYS_OFFSET	(0x10000000UL)
+
+/*
+ * On integrator, the dram is contiguous
+ */
+#define __virt_to_phys__is_a_macro
+#define __virt_to_phys(vpage) ((vpage) - PAGE_OFFSET + PHYS_OFFSET)
+#define __phys_to_virt__is_a_macro
+#define __phys_to_virt(ppage) ((ppage) + PAGE_OFFSET - PHYS_OFFSET)
+
+/*
+ * 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.
+ */
+
+#define __virt_to_bus__is_a_macro
+#define __virt_to_bus(x)	((x) - PAGE_OFFSET)
+#define __bus_to_virt__is_a_macro
+#define __bus_to_virt(x)	((x) + PAGE_OFFSET)
+
+
+/*
+ * Like the SA1100, the EDB7211 has a large gap between physical RAM
+ * banks.  In 2.2, the Psion (CL-PS7110) port added custom support for
+ * discontiguous physical memory.  In 2.4, we can use the standard
+ * Linux NUMA support.
+ *
+ * This is not necessary for EP7211 implementations with only one used
+ * memory bank.  For those systems, simply undefine CONFIG_DISCONTIGMEM.
+ */
+
+#ifdef CONFIG_DISCONTIGMEM
+/*
+ * Because of the wide memory address space between physical RAM banks on the
+ * SA1100, it's much more 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 discontigous 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
+ */
+
+#define NR_NODES	4
+
+/*
+ * Given a kernel address, find the home node of the underlying memory.
+ */
+#define KVADDR_TO_NID(addr) \
+		(((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT)
+
+/*
+ * Given a page frame number, convert it to a node id.
+ */
+#define PFN_TO_NID(pfn) \
+	(((pfn) - PHYS_PFN_OFFSET) >> (NODE_MAX_MEM_SHIFT - PAGE_SHIFT))
+
+/*
+ * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
+ * and returns the mem_map of that node.
+ */
+#define ADDR_TO_MAPBASE(kaddr) \
+			NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr)))
+
+#define PFN_TO_MAPBASE(pfn)	NODE_MEM_MAP(PFN_TO_NID(pfn))
+
+/*
+ * Given a kaddr, LOCAL_MAR_NR 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) & (NODE_MAX_MEM_SIZE - 1)) >> PAGE_SHIFT)
+
+/*
+ * The 7500 has up-to 64Mb of memory per bank
+ */
+#define NODE_MAX_MEM_SHIFT	26
+#define NODE_MAX_MEM_SIZE	(1<<NODE_MAX_MEM_SHIFT)
+
+#endif /* CONFIG_DISCONTIGMEM */
+
+#endif