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55bdd69411
This patch adds the base support for the ARMv7-M architecture. It consists of the corresponding arch/arm/mm/ files and various #ifdef's around the kernel. Exception handling is implemented by a subsequent patch. [ukleinek: squash in some changes originating from commit b5717ba (Cortex-M3: Add support for the Microcontroller Prototyping System) from the v2.6.33-arm1 patch stack, port to post 3.6, drop zImage support, drop reorganisation of pt_regs, assert CONFIG_CPU_V7M doesn't leak into installed headers and a few cosmetic changes] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Jonathan Austin <jonathan.austin@arm.com> Tested-by: Jonathan Austin <jonathan.austin@arm.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
/*
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* linux/arch/arm/mm/nommu.c
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*
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* ARM uCLinux supporting functions.
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/io.h>
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#include <linux/memblock.h>
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#include <asm/cacheflush.h>
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#include <asm/sections.h>
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#include <asm/page.h>
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#include <asm/setup.h>
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#include <asm/traps.h>
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#include <asm/mach/arch.h>
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#include "mm.h"
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void __init arm_mm_memblock_reserve(void)
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{
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#ifndef CONFIG_CPU_V7M
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/*
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* Register the exception vector page.
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* some architectures which the DRAM is the exception vector to trap,
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* alloc_page breaks with error, although it is not NULL, but "0."
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*/
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memblock_reserve(CONFIG_VECTORS_BASE, PAGE_SIZE);
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#else /* ifndef CONFIG_CPU_V7M */
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/*
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* There is no dedicated vector page on V7-M. So nothing needs to be
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* reserved here.
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*/
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#endif
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}
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void __init sanity_check_meminfo(void)
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{
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phys_addr_t end = bank_phys_end(&meminfo.bank[meminfo.nr_banks - 1]);
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high_memory = __va(end - 1) + 1;
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}
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/*
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* paging_init() sets up the page tables, initialises the zone memory
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* maps, and sets up the zero page, bad page and bad page tables.
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*/
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void __init paging_init(struct machine_desc *mdesc)
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{
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early_trap_init((void *)CONFIG_VECTORS_BASE);
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bootmem_init();
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}
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/*
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* We don't need to do anything here for nommu machines.
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*/
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void setup_mm_for_reboot(void)
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{
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}
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void flush_dcache_page(struct page *page)
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{
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__cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
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}
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EXPORT_SYMBOL(flush_dcache_page);
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void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
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unsigned long uaddr, void *dst, const void *src,
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unsigned long len)
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{
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memcpy(dst, src, len);
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if (vma->vm_flags & VM_EXEC)
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__cpuc_coherent_user_range(uaddr, uaddr + len);
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}
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void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
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size_t size, unsigned int mtype)
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{
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if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
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return NULL;
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return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
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}
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EXPORT_SYMBOL(__arm_ioremap_pfn);
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void __iomem *__arm_ioremap_pfn_caller(unsigned long pfn, unsigned long offset,
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size_t size, unsigned int mtype, void *caller)
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{
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return __arm_ioremap_pfn(pfn, offset, size, mtype);
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}
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void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size,
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unsigned int mtype)
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{
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return (void __iomem *)phys_addr;
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}
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EXPORT_SYMBOL(__arm_ioremap);
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void __iomem * (*arch_ioremap_caller)(unsigned long, size_t, unsigned int, void *);
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void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
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unsigned int mtype, void *caller)
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{
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return __arm_ioremap(phys_addr, size, mtype);
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}
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void (*arch_iounmap)(volatile void __iomem *);
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void __arm_iounmap(volatile void __iomem *addr)
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{
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}
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EXPORT_SYMBOL(__arm_iounmap);
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