Release 4.15 arch/arm/mm/nommu.c

Directory: arch/arm/mm
/*
 *  linux/arch/arm/mm/nommu.c
 *
 * ARM uCLinux supporting functions.
 */
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/kernel.h>

#include <asm/cacheflush.h>
#include <asm/cp15.h>
#include <asm/sections.h>
#include <asm/page.h>
#include <asm/setup.h>
#include <asm/traps.h>
#include <asm/mach/arch.h>
#include <asm/cputype.h>
#include <asm/mpu.h>
#include <asm/procinfo.h>

#include "mm.h"


unsigned long vectors_base;

#ifdef CONFIG_ARM_MPU

struct mpu_rgn_info mpu_rgn_info;
#endif

#ifdef CONFIG_CPU_CP15
#ifdef CONFIG_CPU_HIGH_VECTOR


static unsigned long __init setup_vectors_base(void)
{
	unsigned long reg = get_cr();

	set_cr(reg | CR_V);
	return 0xffff0000;
}
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#else /* CONFIG_CPU_HIGH_VECTOR */
/* Write exception base address to VBAR */


static inline void set_vbar(unsigned long val)
{
	asm("mcr p15, 0, %0, c12, c0, 0" : : "r" (val) : "cc");
}

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/*
 * Security extensions, bits[7:4], permitted values,
 * 0b0000 - not implemented, 0b0001/0b0010 - implemented
 */


static inline bool security_extensions_enabled(void)
{
	/* Check CPUID Identification Scheme before ID_PFR1 read */
	if ((read_cpuid_id() & 0x000f0000) == 0x000f0000)
		return !!cpuid_feature_extract(CPUID_EXT_PFR1, 4);
	return 0;
}

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static unsigned long __init setup_vectors_base(void)
{
	unsigned long base = 0, reg = get_cr();

	set_cr(reg & ~CR_V);
	if (security_extensions_enabled()) {
		if (IS_ENABLED(CONFIG_REMAP_VECTORS_TO_RAM))
			base = CONFIG_DRAM_BASE;
		set_vbar(base);
	} else if (IS_ENABLED(CONFIG_REMAP_VECTORS_TO_RAM)) {
		if (CONFIG_DRAM_BASE != 0)
			pr_err("Security extensions not enabled, vectors cannot be remapped to RAM, vectors base will be 0x00000000\n");
	}

	return base;
}
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#endif /* CONFIG_CPU_HIGH_VECTOR */
#endif /* CONFIG_CPU_CP15 */



void __init arm_mm_memblock_reserve(void)
{
#ifndef CONFIG_CPU_V7M
	vectors_base = IS_ENABLED(CONFIG_CPU_CP15) ? setup_vectors_base() : 0;
	/*
         * Register the exception vector page.
         * some architectures which the DRAM is the exception vector to trap,
         * alloc_page breaks with error, although it is not NULL, but "0."
         */
	memblock_reserve(vectors_base, 2 * PAGE_SIZE);
#else /* ifndef CONFIG_CPU_V7M */
	/*
         * There is no dedicated vector page on V7-M. So nothing needs to be
         * reserved here.
         */
#endif
	/*
         * In any case, always ensure address 0 is never used as many things
         * get very confused if 0 is returned as a legitimate address.
         */
	memblock_reserve(0, 1);
}

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Russell King 15 31.91% 3 42.86%
Afzal Mohammed 13 27.66% 1 14.29%
Catalin Marinas 9 19.15% 1 14.29%
Nico Pitre 8 17.02% 1 14.29%
Jean-Philippe Brucker 2 4.26% 1 14.29%
Total 47 100.00% 7 100.00%



void __init adjust_lowmem_bounds(void)
{
	phys_addr_t end;
	adjust_lowmem_bounds_mpu();
	end = memblock_end_of_DRAM();
	high_memory = __va(end - 1) + 1;
	memblock_set_current_limit(end);
}

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Nico Pitre 15 42.86% 1 16.67%
Laura Abbott 9 25.71% 3 50.00%
Jonathan Austin 6 17.14% 1 16.67%
Russell King 5 14.29% 1 16.67%
Total 35 100.00% 6 100.00%

/*
 * paging_init() sets up the page tables, initialises the zone memory
 * maps, and sets up the zero page, bad page and bad page tables.
 */


void __init paging_init(const struct machine_desc *mdesc)
{
	early_trap_init((void *)vectors_base);
	mpu_setup();
	bootmem_init();
}

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Russell King 15 55.56% 3 50.00%
Will Deacon 8 29.63% 1 16.67%
Jonathan Austin 3 11.11% 1 16.67%
Afzal Mohammed 1 3.70% 1 16.67%
Total 27 100.00% 6 100.00%

/*
 * We don't need to do anything here for nommu machines.
 */


void setup_mm_for_reboot(void)
{
}

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void flush_dcache_page(struct page *page)
{
	__cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
}
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Russell King 20 100.00% 2 100.00%
Total 20 100.00% 2 100.00%


EXPORT_SYMBOL(flush_dcache_page);



void flush_kernel_dcache_page(struct page *page)
{
	__cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
}
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Simon Baatz 20 100.00% 1 100.00%
Total 20 100.00% 1 100.00%


EXPORT_SYMBOL(flush_kernel_dcache_page);



void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
		       unsigned long uaddr, void *dst, const void *src,
		       unsigned long len)
{
	memcpy(dst, src, len);
	if (vma->vm_flags & VM_EXEC)
		__cpuc_coherent_user_range(uaddr, uaddr + len);
}

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Total 58 100.00% 1 100.00%



void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
				size_t size, unsigned int mtype)
{
	if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
		return NULL;
	return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
}
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Russell King 51 100.00% 2 100.00%
Total 51 100.00% 2 100.00%


EXPORT_SYMBOL(__arm_ioremap_pfn);



void __iomem *__arm_ioremap_caller(phys_addr_t phys_addr, size_t size,
				   unsigned int mtype, void *caller)
{
	return (void __iomem *)phys_addr;
}

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Russell King 29 100.00% 3 100.00%
Total 29 100.00% 3 100.00%


void __iomem * (*arch_ioremap_caller)(phys_addr_t, size_t, unsigned int, void *);



void __iomem *ioremap(resource_size_t res_cookie, size_t size)
{
	return __arm_ioremap_caller(res_cookie, size, MT_DEVICE,
				    __builtin_return_address(0));
}
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Russell King 28 100.00% 2 100.00%
Total 28 100.00% 2 100.00%


EXPORT_SYMBOL(ioremap);

void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size)
	
__alias(ioremap_cached);



void __iomem *ioremap_cached(resource_size_t res_cookie, size_t size)
{
	return __arm_ioremap_caller(res_cookie, size, MT_DEVICE_CACHED,
				    __builtin_return_address(0));
}
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Russell King 17 60.71% 1 50.00%
Ard Biesheuvel 11 39.29% 1 50.00%
Total 28 100.00% 2 100.00%


EXPORT_SYMBOL(ioremap_cache);

EXPORT_SYMBOL(ioremap_cached);



void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size)
{
	return __arm_ioremap_caller(res_cookie, size, MT_DEVICE_WC,
				    __builtin_return_address(0));
}
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Russell King 28 100.00% 2 100.00%
Total 28 100.00% 2 100.00%


EXPORT_SYMBOL(ioremap_wc);

#ifdef CONFIG_PCI

#include <asm/mach/map.h>



void __iomem *pci_remap_cfgspace(resource_size_t res_cookie, size_t size)
{
	return arch_ioremap_caller(res_cookie, size, MT_UNCACHED,
				   __builtin_return_address(0));
}
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Total 28 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(pci_remap_cfgspace);
#endif



void *arch_memremap_wb(phys_addr_t phys_addr, size_t size)
{
	return (void *)phys_addr;
}

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void __iounmap(volatile void __iomem *addr)
{
}
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EXPORT_SYMBOL(__iounmap);


void (*arch_iounmap)(volatile void __iomem *);



void iounmap(volatile void __iomem *addr)
{
}
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Russell King 10 100.00% 3 100.00%
Total 10 100.00% 3 100.00%


EXPORT_SYMBOL(iounmap);
Overall Contributors
Person Tokens Prop Commits CommitProp
Russell King 311 39.77% 18 46.15%
Afzal Mohammed 187 23.91% 2 5.13%
Catalin Marinas 70 8.95% 3 7.69%
Lorenzo Pieralisi 41 5.24% 1 2.56%
Ard Biesheuvel 40 5.12% 2 5.13%
Rob Herring 30 3.84% 1 2.56%
Jonathan Austin 27 3.45% 2 5.13%
Simon Baatz 25 3.20% 1 2.56%
Nico Pitre 23 2.94% 2 5.13%
Will Deacon 11 1.41% 1 2.56%
Laura Abbott 10 1.28% 4 10.26%
Hyok S. Choi 5 0.64% 1 2.56%
Jean-Philippe Brucker 2 0.26% 1 2.56%
Total 782 100.00% 39 100.00%
Directory: arch/arm/mm

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Total	27	100.00%	1	100.00%
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Release 4.15 arch/arm/mm/nommu.c

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