75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Re-map IO memory to kernel address space so that we can access it.
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* This is needed for high PCI addresses that aren't mapped in the
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* 640k-1MB IO memory area on PC's
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*
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* (C) Copyright 1995 1996 Linus Torvalds
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*/
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/io.h>
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#include <linux/export.h>
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#include <asm/cacheflush.h>
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#include "pgalloc-track.h"
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#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
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static unsigned int __ro_after_init iomap_max_page_shift = BITS_PER_LONG - 1;
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static int __init set_nohugeiomap(char *str)
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{
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iomap_max_page_shift = PAGE_SHIFT;
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return 0;
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}
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early_param("nohugeiomap", set_nohugeiomap);
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#else /* CONFIG_HAVE_ARCH_HUGE_VMAP */
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static const unsigned int iomap_max_page_shift = PAGE_SHIFT;
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#endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */
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int ioremap_page_range(unsigned long addr,
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unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
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{
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return vmap_range(addr, end, phys_addr, prot, iomap_max_page_shift);
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}
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#ifdef CONFIG_GENERIC_IOREMAP
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void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot)
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{
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unsigned long offset, vaddr;
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phys_addr_t last_addr;
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struct vm_struct *area;
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/* Disallow wrap-around or zero size */
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last_addr = addr + size - 1;
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if (!size || last_addr < addr)
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return NULL;
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/* Page-align mappings */
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offset = addr & (~PAGE_MASK);
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addr -= offset;
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size = PAGE_ALIGN(size + offset);
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area = get_vm_area_caller(size, VM_IOREMAP,
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__builtin_return_address(0));
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if (!area)
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return NULL;
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vaddr = (unsigned long)area->addr;
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if (ioremap_page_range(vaddr, vaddr + size, addr, __pgprot(prot))) {
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free_vm_area(area);
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return NULL;
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}
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return (void __iomem *)(vaddr + offset);
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}
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EXPORT_SYMBOL(ioremap_prot);
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void iounmap(volatile void __iomem *addr)
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{
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vunmap((void *)((unsigned long)addr & PAGE_MASK));
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}
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EXPORT_SYMBOL(iounmap);
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#endif /* CONFIG_GENERIC_IOREMAP */
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