diff options
Diffstat (limited to 'arch/x86/mm/ioremap_64.c')
| -rw-r--r-- | arch/x86/mm/ioremap_64.c | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/arch/x86/mm/ioremap_64.c b/arch/x86/mm/ioremap_64.c deleted file mode 100644 index 6cac90aa503..00000000000 --- a/arch/x86/mm/ioremap_64.c +++ /dev/null @@ -1,210 +0,0 @@ -/* - * arch/x86_64/mm/ioremap.c - * - * Re-map IO memory to kernel address space so that we can access it. - * This is needed for high PCI addresses that aren't mapped in the - * 640k-1MB IO memory area on PC's - * - * (C) Copyright 1995 1996 Linus Torvalds - */ - -#include <linux/vmalloc.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/io.h> - -#include <asm/pgalloc.h> -#include <asm/fixmap.h> -#include <asm/tlbflush.h> -#include <asm/cacheflush.h> -#include <asm/proto.h> - -unsigned long __phys_addr(unsigned long x) -{ - if (x >= __START_KERNEL_map) - return x - __START_KERNEL_map + phys_base; - return x - PAGE_OFFSET; -} -EXPORT_SYMBOL(__phys_addr); - -#define ISA_START_ADDRESS 0xa0000 -#define ISA_END_ADDRESS 0x100000 - -/* - * Fix up the linear direct mapping of the kernel to avoid cache attribute - * conflicts. - */ -static int -ioremap_change_attr(unsigned long phys_addr, unsigned long size, - unsigned long flags) -{ - int err = 0; - if (phys_addr + size - 1 < (end_pfn_map << PAGE_SHIFT)) { - unsigned long npages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; - unsigned long vaddr = (unsigned long) __va(phys_addr); - - /* - * Must use a address here and not struct page because the phys addr - * can be a in hole between nodes and not have an memmap entry. - */ - err = change_page_attr_addr(vaddr,npages,__pgprot(__PAGE_KERNEL|flags)); - if (!err) - global_flush_tlb(); - } - return err; -} - -/* - * Generic mapping function - */ - -/* - * Remap an arbitrary physical address space into the kernel virtual - * address space. Needed when the kernel wants to access high addresses - * directly. - * - * NOTE! We need to allow non-page-aligned mappings too: we will obviously - * have to convert them into an offset in a page-aligned mapping, but the - * caller shouldn't need to know that small detail. - */ -void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags) -{ - void * addr; - struct vm_struct * area; - unsigned long offset, last_addr; - pgprot_t pgprot; - - /* Don't allow wraparound or zero size */ - last_addr = phys_addr + size - 1; - if (!size || last_addr < phys_addr) - return NULL; - - /* - * Don't remap the low PCI/ISA area, it's always mapped.. - */ - if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS) - return (__force void __iomem *)phys_to_virt(phys_addr); - -#ifdef CONFIG_FLATMEM - /* - * Don't allow anybody to remap normal RAM that we're using.. - */ - if (last_addr < virt_to_phys(high_memory)) { - char *t_addr, *t_end; - struct page *page; - - t_addr = __va(phys_addr); - t_end = t_addr + (size - 1); - - for(page = virt_to_page(t_addr); page <= virt_to_page(t_end); page++) - if(!PageReserved(page)) - return NULL; - } -#endif - - pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_GLOBAL - | _PAGE_DIRTY | _PAGE_ACCESSED | flags); - /* - * Mappings have to be page-aligned - */ - offset = phys_addr & ~PAGE_MASK; - phys_addr &= PAGE_MASK; - size = PAGE_ALIGN(last_addr+1) - phys_addr; - - /* - * Ok, go for it.. - */ - area = get_vm_area(size, VM_IOREMAP | (flags << 20)); - if (!area) - return NULL; - area->phys_addr = phys_addr; - addr = area->addr; - if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size, - phys_addr, pgprot)) { - remove_vm_area((void *)(PAGE_MASK & (unsigned long) addr)); - return NULL; - } - if (flags && ioremap_change_attr(phys_addr, size, flags) < 0) { - area->flags &= 0xffffff; - vunmap(addr); - return NULL; - } - return (__force void __iomem *) (offset + (char *)addr); -} -EXPORT_SYMBOL(__ioremap); - -/** - * ioremap_nocache - map bus memory into CPU space - * @offset: bus address of the memory - * @size: size of the resource to map - * - * ioremap_nocache performs a platform specific sequence of operations to - * make bus memory CPU accessible via the readb/readw/readl/writeb/ - * writew/writel functions and the other mmio helpers. The returned - * address is not guaranteed to be usable directly as a virtual - * address. - * - * This version of ioremap ensures that the memory is marked uncachable - * on the CPU as well as honouring existing caching rules from things like - * the PCI bus. Note that there are other caches and buffers on many - * busses. In particular driver authors should read up on PCI writes - * - * It's useful if some control registers are in such an area and - * write combining or read caching is not desirable: - * - * Must be freed with iounmap. - */ - -void __iomem *ioremap_nocache (unsigned long phys_addr, unsigned long size) -{ - return __ioremap(phys_addr, size, _PAGE_PCD); -} -EXPORT_SYMBOL(ioremap_nocache); - -/** - * iounmap - Free a IO remapping - * @addr: virtual address from ioremap_* - * - * Caller must ensure there is only one unmapping for the same pointer. - */ -void iounmap(volatile void __iomem *addr) -{ - struct vm_struct *p, *o; - - if (addr <= high_memory) - return; - if (addr >= phys_to_virt(ISA_START_ADDRESS) && - addr < phys_to_virt(ISA_END_ADDRESS)) - return; - - addr = (volatile void __iomem *)(PAGE_MASK & (unsigned long __force)addr); - /* Use the vm area unlocked, assuming the caller - ensures there isn't another iounmap for the same address - in parallel. Reuse of the virtual address is prevented by - leaving it in the global lists until we're done with it. - cpa takes care of the direct mappings. */ - read_lock(&vmlist_lock); - for (p = vmlist; p; p = p->next) { - if (p->addr == addr) - break; - } - read_unlock(&vmlist_lock); - - if (!p) { - printk("iounmap: bad address %p\n", addr); - dump_stack(); - return; - } - - /* Reset the direct mapping. Can block */ - if (p->flags >> 20) - ioremap_change_attr(p->phys_addr, p->size, 0); - - /* Finally remove it */ - o = remove_vm_area((void *)addr); - BUG_ON(p != o || o == NULL); - kfree(p); -} -EXPORT_SYMBOL(iounmap); - |