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37d07b72ef
Patch from Nicolas Pitre Since vmlinux.lds.S is preprocessed, we can use the defines already present in asm/memory.h (allowed by patch #3060) for the XIP kernel link address instead of relying on a duplicated Makefile hardcoded value, and also get rid of its dependency on awk to handle it at the same time. While at it let's clean XIP stuff even further and make things clearer in head.S with a nice code reduction. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
231 lines
6.6 KiB
C
231 lines
6.6 KiB
C
/*
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* linux/include/asm-arm/memory.h
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*
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* Copyright (C) 2000-2002 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Note: this file should not be included by non-asm/.h files
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*/
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#ifndef __ASM_ARM_MEMORY_H
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#define __ASM_ARM_MEMORY_H
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/*
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* Allow for constants defined here to be used from assembly code
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* by prepending the UL suffix only with actual C code compilation.
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*/
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#ifndef __ASSEMBLY__
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#define UL(x) (x##UL)
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#else
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#define UL(x) (x)
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#endif
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#include <linux/config.h>
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#include <linux/compiler.h>
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#include <asm/arch/memory.h>
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#ifndef TASK_SIZE
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/*
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* TASK_SIZE - the maximum size of a user space task.
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* TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
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*/
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#define TASK_SIZE UL(0xbf000000)
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#define TASK_UNMAPPED_BASE UL(0x40000000)
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#endif
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/*
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* The maximum size of a 26-bit user space task.
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*/
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#define TASK_SIZE_26 UL(0x04000000)
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/*
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* Page offset: 3GB
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*/
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#ifndef PAGE_OFFSET
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#define PAGE_OFFSET UL(0xc0000000)
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#endif
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/*
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* Physical vs virtual RAM address space conversion. These are
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* private definitions which should NOT be used outside memory.h
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* files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
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*/
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#ifndef __virt_to_phys
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#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
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#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
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#endif
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/*
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* The module space lives between the addresses given by TASK_SIZE
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* and PAGE_OFFSET - it must be within 32MB of the kernel text.
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*/
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#define MODULE_END (PAGE_OFFSET)
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#define MODULE_START (MODULE_END - 16*1048576)
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#if TASK_SIZE > MODULE_START
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#error Top of user space clashes with start of module space
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#endif
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/*
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* The XIP kernel gets mapped at the bottom of the module vm area.
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* Since we use sections to map it, this macro replaces the physical address
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* with its virtual address while keeping offset from the base section.
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*/
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#define XIP_VIRT_ADDR(physaddr) (MODULE_START + ((physaddr) & 0x000fffff))
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#ifndef __ASSEMBLY__
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/*
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* The DMA mask corresponding to the maximum bus address allocatable
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* using GFP_DMA. The default here places no restriction on DMA
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* allocations. This must be the smallest DMA mask in the system,
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* so a successful GFP_DMA allocation will always satisfy this.
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*/
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#ifndef ISA_DMA_THRESHOLD
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#define ISA_DMA_THRESHOLD (0xffffffffULL)
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#endif
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#ifndef arch_adjust_zones
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#define arch_adjust_zones(node,size,holes) do { } while (0)
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#endif
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/*
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* PFNs are used to describe any physical page; this means
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* PFN 0 == physical address 0.
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*
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* This is the PFN of the first RAM page in the kernel
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* direct-mapped view. We assume this is the first page
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* of RAM in the mem_map as well.
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*/
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#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
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/*
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* These are *only* valid on the kernel direct mapped RAM memory.
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* Note: Drivers should NOT use these. They are the wrong
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* translation for translating DMA addresses. Use the driver
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* DMA support - see dma-mapping.h.
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*/
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static inline unsigned long virt_to_phys(void *x)
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{
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return __virt_to_phys((unsigned long)(x));
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}
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static inline void *phys_to_virt(unsigned long x)
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{
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return (void *)(__phys_to_virt((unsigned long)(x)));
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}
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/*
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* Drivers should NOT use these either.
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*/
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#define __pa(x) __virt_to_phys((unsigned long)(x))
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#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
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/*
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* Virtual <-> DMA view memory address translations
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* Again, these are *only* valid on the kernel direct mapped RAM
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* memory. Use of these is *deprecated* (and that doesn't mean
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* use the __ prefixed forms instead.) See dma-mapping.h.
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*/
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static inline __deprecated unsigned long virt_to_bus(void *x)
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{
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return __virt_to_bus((unsigned long)x);
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}
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static inline __deprecated void *bus_to_virt(unsigned long x)
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{
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return (void *)__bus_to_virt(x);
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}
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/*
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* Conversion between a struct page and a physical address.
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*
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* Note: when converting an unknown physical address to a
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* struct page, the resulting pointer must be validated
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* using VALID_PAGE(). It must return an invalid struct page
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* for any physical address not corresponding to a system
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* RAM address.
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*
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* page_to_pfn(page) convert a struct page * to a PFN number
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* pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
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* pfn_valid(pfn) indicates whether a PFN number is valid
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*
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* virt_to_page(k) convert a _valid_ virtual address to struct page *
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* virt_addr_valid(k) indicates whether a virtual address is valid
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*/
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#ifndef CONFIG_DISCONTIGMEM
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#define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET)
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#define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET)
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#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
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#define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
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#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
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#define PHYS_TO_NID(addr) (0)
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#else /* CONFIG_DISCONTIGMEM */
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/*
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* This is more complex. We have a set of mem_map arrays spread
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* around in memory.
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*/
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#include <linux/numa.h>
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#define page_to_pfn(page) \
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(( (page) - page_zone(page)->zone_mem_map) \
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+ page_zone(page)->zone_start_pfn)
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#define pfn_to_page(pfn) \
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(PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT))
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#define pfn_valid(pfn) \
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({ \
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unsigned int nid = PFN_TO_NID(pfn); \
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int valid = nid < MAX_NUMNODES; \
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if (valid) { \
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pg_data_t *node = NODE_DATA(nid); \
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valid = (pfn - node->node_start_pfn) < \
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node->node_spanned_pages; \
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} \
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valid; \
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})
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#define virt_to_page(kaddr) \
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(ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
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#define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
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/*
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* Common discontigmem stuff.
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* PHYS_TO_NID is used by the ARM kernel/setup.c
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*/
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#define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
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#endif /* !CONFIG_DISCONTIGMEM */
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/*
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* For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
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*/
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#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
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/*
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* Optional device DMA address remapping. Do _not_ use directly!
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* We should really eliminate virt_to_bus() here - it's deprecated.
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*/
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#ifndef __arch_page_to_dma
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#define page_to_dma(dev, page) ((dma_addr_t)__virt_to_bus((unsigned long)page_address(page)))
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#define dma_to_virt(dev, addr) ((void *)__bus_to_virt(addr))
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#define virt_to_dma(dev, addr) ((dma_addr_t)__virt_to_bus((unsigned long)(addr)))
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#else
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#define page_to_dma(dev, page) (__arch_page_to_dma(dev, page))
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#define dma_to_virt(dev, addr) (__arch_dma_to_virt(dev, addr))
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#define virt_to_dma(dev, addr) (__arch_virt_to_dma(dev, addr))
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#endif
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#endif
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#endif
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