mirror of https://gitee.com/openkylin/linux.git
754 lines
20 KiB
C
754 lines
20 KiB
C
/*
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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/bootmem.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/mmiotrace.h>
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#include <linux/mem_encrypt.h>
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#include <linux/efi.h>
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#include <asm/set_memory.h>
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#include <asm/e820/api.h>
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#include <asm/fixmap.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/pgalloc.h>
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#include <asm/pat.h>
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#include <asm/setup.h>
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#include "physaddr.h"
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/*
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* Fix up the linear direct mapping of the kernel to avoid cache attribute
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* conflicts.
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*/
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int ioremap_change_attr(unsigned long vaddr, unsigned long size,
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enum page_cache_mode pcm)
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{
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unsigned long nrpages = size >> PAGE_SHIFT;
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int err;
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switch (pcm) {
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case _PAGE_CACHE_MODE_UC:
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default:
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err = _set_memory_uc(vaddr, nrpages);
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break;
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case _PAGE_CACHE_MODE_WC:
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err = _set_memory_wc(vaddr, nrpages);
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break;
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case _PAGE_CACHE_MODE_WT:
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err = _set_memory_wt(vaddr, nrpages);
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break;
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case _PAGE_CACHE_MODE_WB:
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err = _set_memory_wb(vaddr, nrpages);
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break;
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}
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return err;
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}
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static int __ioremap_check_ram(unsigned long start_pfn, unsigned long nr_pages,
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void *arg)
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{
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unsigned long i;
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for (i = 0; i < nr_pages; ++i)
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if (pfn_valid(start_pfn + i) &&
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!PageReserved(pfn_to_page(start_pfn + i)))
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return 1;
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return 0;
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}
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/*
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* Remap an arbitrary physical address space into the kernel virtual
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* address space. It transparently creates kernel huge I/O mapping when
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* the physical address is aligned by a huge page size (1GB or 2MB) and
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* the requested size is at least the huge page size.
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*
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* NOTE: MTRRs can override PAT memory types with a 4KB granularity.
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* Therefore, the mapping code falls back to use a smaller page toward 4KB
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* when a mapping range is covered by non-WB type of MTRRs.
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*
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* NOTE! We need to allow non-page-aligned mappings too: we will obviously
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* have to convert them into an offset in a page-aligned mapping, but the
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* caller shouldn't need to know that small detail.
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*/
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static void __iomem *__ioremap_caller(resource_size_t phys_addr,
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unsigned long size, enum page_cache_mode pcm, void *caller)
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{
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unsigned long offset, vaddr;
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resource_size_t pfn, last_pfn, last_addr;
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const resource_size_t unaligned_phys_addr = phys_addr;
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const unsigned long unaligned_size = size;
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struct vm_struct *area;
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enum page_cache_mode new_pcm;
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pgprot_t prot;
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int retval;
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void __iomem *ret_addr;
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/* Don't allow wraparound or zero size */
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last_addr = phys_addr + size - 1;
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if (!size || last_addr < phys_addr)
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return NULL;
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if (!phys_addr_valid(phys_addr)) {
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printk(KERN_WARNING "ioremap: invalid physical address %llx\n",
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(unsigned long long)phys_addr);
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WARN_ON_ONCE(1);
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return NULL;
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}
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/*
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* Don't allow anybody to remap normal RAM that we're using..
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*/
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pfn = phys_addr >> PAGE_SHIFT;
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last_pfn = last_addr >> PAGE_SHIFT;
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if (walk_system_ram_range(pfn, last_pfn - pfn + 1, NULL,
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__ioremap_check_ram) == 1) {
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WARN_ONCE(1, "ioremap on RAM at %pa - %pa\n",
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&phys_addr, &last_addr);
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return NULL;
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}
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/*
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* Mappings have to be page-aligned
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*/
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offset = phys_addr & ~PAGE_MASK;
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phys_addr &= PHYSICAL_PAGE_MASK;
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size = PAGE_ALIGN(last_addr+1) - phys_addr;
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retval = reserve_memtype(phys_addr, (u64)phys_addr + size,
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pcm, &new_pcm);
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if (retval) {
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printk(KERN_ERR "ioremap reserve_memtype failed %d\n", retval);
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return NULL;
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}
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if (pcm != new_pcm) {
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if (!is_new_memtype_allowed(phys_addr, size, pcm, new_pcm)) {
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printk(KERN_ERR
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"ioremap error for 0x%llx-0x%llx, requested 0x%x, got 0x%x\n",
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(unsigned long long)phys_addr,
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(unsigned long long)(phys_addr + size),
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pcm, new_pcm);
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goto err_free_memtype;
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}
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pcm = new_pcm;
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}
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prot = PAGE_KERNEL_IO;
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switch (pcm) {
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case _PAGE_CACHE_MODE_UC:
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default:
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prot = __pgprot(pgprot_val(prot) |
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cachemode2protval(_PAGE_CACHE_MODE_UC));
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break;
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case _PAGE_CACHE_MODE_UC_MINUS:
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prot = __pgprot(pgprot_val(prot) |
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cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS));
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break;
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case _PAGE_CACHE_MODE_WC:
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prot = __pgprot(pgprot_val(prot) |
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cachemode2protval(_PAGE_CACHE_MODE_WC));
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break;
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case _PAGE_CACHE_MODE_WT:
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prot = __pgprot(pgprot_val(prot) |
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cachemode2protval(_PAGE_CACHE_MODE_WT));
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break;
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case _PAGE_CACHE_MODE_WB:
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break;
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}
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/*
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* Ok, go for it..
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*/
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area = get_vm_area_caller(size, VM_IOREMAP, caller);
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if (!area)
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goto err_free_memtype;
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area->phys_addr = phys_addr;
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vaddr = (unsigned long) area->addr;
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if (kernel_map_sync_memtype(phys_addr, size, pcm))
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goto err_free_area;
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if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot))
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goto err_free_area;
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ret_addr = (void __iomem *) (vaddr + offset);
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mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr);
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/*
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* Check if the request spans more than any BAR in the iomem resource
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* tree.
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*/
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if (iomem_map_sanity_check(unaligned_phys_addr, unaligned_size))
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pr_warn("caller %pS mapping multiple BARs\n", caller);
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return ret_addr;
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err_free_area:
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free_vm_area(area);
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err_free_memtype:
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free_memtype(phys_addr, phys_addr + size);
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return NULL;
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}
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/**
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* ioremap_nocache - map bus memory into CPU space
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* @phys_addr: bus address of the memory
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* @size: size of the resource to map
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*
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* ioremap_nocache performs a platform specific sequence of operations to
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* make bus memory CPU accessible via the readb/readw/readl/writeb/
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* writew/writel functions and the other mmio helpers. The returned
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* address is not guaranteed to be usable directly as a virtual
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* address.
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*
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* This version of ioremap ensures that the memory is marked uncachable
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* on the CPU as well as honouring existing caching rules from things like
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* the PCI bus. Note that there are other caches and buffers on many
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* busses. In particular driver authors should read up on PCI writes
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*
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* It's useful if some control registers are in such an area and
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* write combining or read caching is not desirable:
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*
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* Must be freed with iounmap.
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*/
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void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size)
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{
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/*
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* Ideally, this should be:
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* pat_enabled() ? _PAGE_CACHE_MODE_UC : _PAGE_CACHE_MODE_UC_MINUS;
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*
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* Till we fix all X drivers to use ioremap_wc(), we will use
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* UC MINUS. Drivers that are certain they need or can already
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* be converted over to strong UC can use ioremap_uc().
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*/
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enum page_cache_mode pcm = _PAGE_CACHE_MODE_UC_MINUS;
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return __ioremap_caller(phys_addr, size, pcm,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap_nocache);
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/**
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* ioremap_uc - map bus memory into CPU space as strongly uncachable
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* @phys_addr: bus address of the memory
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* @size: size of the resource to map
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*
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* ioremap_uc performs a platform specific sequence of operations to
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* make bus memory CPU accessible via the readb/readw/readl/writeb/
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* writew/writel functions and the other mmio helpers. The returned
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* address is not guaranteed to be usable directly as a virtual
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* address.
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*
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* This version of ioremap ensures that the memory is marked with a strong
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* preference as completely uncachable on the CPU when possible. For non-PAT
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* systems this ends up setting page-attribute flags PCD=1, PWT=1. For PAT
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* systems this will set the PAT entry for the pages as strong UC. This call
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* will honor existing caching rules from things like the PCI bus. Note that
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* there are other caches and buffers on many busses. In particular driver
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* authors should read up on PCI writes.
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*
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* It's useful if some control registers are in such an area and
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* write combining or read caching is not desirable:
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*
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* Must be freed with iounmap.
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*/
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void __iomem *ioremap_uc(resource_size_t phys_addr, unsigned long size)
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{
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enum page_cache_mode pcm = _PAGE_CACHE_MODE_UC;
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return __ioremap_caller(phys_addr, size, pcm,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL_GPL(ioremap_uc);
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/**
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* ioremap_wc - map memory into CPU space write combined
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* @phys_addr: bus address of the memory
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* @size: size of the resource to map
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*
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* This version of ioremap ensures that the memory is marked write combining.
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* Write combining allows faster writes to some hardware devices.
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*
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* Must be freed with iounmap.
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*/
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void __iomem *ioremap_wc(resource_size_t phys_addr, unsigned long size)
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{
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return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WC,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap_wc);
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/**
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* ioremap_wt - map memory into CPU space write through
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* @phys_addr: bus address of the memory
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* @size: size of the resource to map
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*
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* This version of ioremap ensures that the memory is marked write through.
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* Write through stores data into memory while keeping the cache up-to-date.
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*
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* Must be freed with iounmap.
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*/
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void __iomem *ioremap_wt(resource_size_t phys_addr, unsigned long size)
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{
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return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WT,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap_wt);
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void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size)
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{
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return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WB,
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap_cache);
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void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size,
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unsigned long prot_val)
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{
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return __ioremap_caller(phys_addr, size,
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pgprot2cachemode(__pgprot(prot_val)),
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__builtin_return_address(0));
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}
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EXPORT_SYMBOL(ioremap_prot);
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/**
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* iounmap - Free a IO remapping
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* @addr: virtual address from ioremap_*
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*
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* Caller must ensure there is only one unmapping for the same pointer.
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*/
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void iounmap(volatile void __iomem *addr)
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{
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struct vm_struct *p, *o;
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if ((void __force *)addr <= high_memory)
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return;
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/*
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* The PCI/ISA range special-casing was removed from __ioremap()
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* so this check, in theory, can be removed. However, there are
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* cases where iounmap() is called for addresses not obtained via
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* ioremap() (vga16fb for example). Add a warning so that these
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* cases can be caught and fixed.
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*/
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if ((void __force *)addr >= phys_to_virt(ISA_START_ADDRESS) &&
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(void __force *)addr < phys_to_virt(ISA_END_ADDRESS)) {
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WARN(1, "iounmap() called for ISA range not obtained using ioremap()\n");
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return;
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}
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addr = (volatile void __iomem *)
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(PAGE_MASK & (unsigned long __force)addr);
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mmiotrace_iounmap(addr);
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/* Use the vm area unlocked, assuming the caller
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ensures there isn't another iounmap for the same address
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in parallel. Reuse of the virtual address is prevented by
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leaving it in the global lists until we're done with it.
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cpa takes care of the direct mappings. */
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p = find_vm_area((void __force *)addr);
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if (!p) {
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printk(KERN_ERR "iounmap: bad address %p\n", addr);
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dump_stack();
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return;
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}
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free_memtype(p->phys_addr, p->phys_addr + get_vm_area_size(p));
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/* Finally remove it */
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o = remove_vm_area((void __force *)addr);
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BUG_ON(p != o || o == NULL);
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kfree(p);
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}
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EXPORT_SYMBOL(iounmap);
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int __init arch_ioremap_pud_supported(void)
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{
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#ifdef CONFIG_X86_64
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return boot_cpu_has(X86_FEATURE_GBPAGES);
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#else
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return 0;
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#endif
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}
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int __init arch_ioremap_pmd_supported(void)
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{
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return boot_cpu_has(X86_FEATURE_PSE);
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}
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/*
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* Convert a physical pointer to a virtual kernel pointer for /dev/mem
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* access
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*/
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void *xlate_dev_mem_ptr(phys_addr_t phys)
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{
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unsigned long start = phys & PAGE_MASK;
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unsigned long offset = phys & ~PAGE_MASK;
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void *vaddr;
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/* memremap() maps if RAM, otherwise falls back to ioremap() */
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vaddr = memremap(start, PAGE_SIZE, MEMREMAP_WB);
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/* Only add the offset on success and return NULL if memremap() failed */
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if (vaddr)
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vaddr += offset;
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return vaddr;
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}
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void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
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{
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memunmap((void *)((unsigned long)addr & PAGE_MASK));
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}
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/*
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* Examine the physical address to determine if it is an area of memory
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* that should be mapped decrypted. If the memory is not part of the
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* kernel usable area it was accessed and created decrypted, so these
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* areas should be mapped decrypted. And since the encryption key can
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* change across reboots, persistent memory should also be mapped
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* decrypted.
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*/
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static bool memremap_should_map_decrypted(resource_size_t phys_addr,
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unsigned long size)
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{
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int is_pmem;
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/*
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* Check if the address is part of a persistent memory region.
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* This check covers areas added by E820, EFI and ACPI.
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*/
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is_pmem = region_intersects(phys_addr, size, IORESOURCE_MEM,
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IORES_DESC_PERSISTENT_MEMORY);
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if (is_pmem != REGION_DISJOINT)
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return true;
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/*
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* Check if the non-volatile attribute is set for an EFI
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* reserved area.
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*/
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if (efi_enabled(EFI_BOOT)) {
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switch (efi_mem_type(phys_addr)) {
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case EFI_RESERVED_TYPE:
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if (efi_mem_attributes(phys_addr) & EFI_MEMORY_NV)
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return true;
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break;
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default:
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break;
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}
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}
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/* Check if the address is outside kernel usable area */
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switch (e820__get_entry_type(phys_addr, phys_addr + size - 1)) {
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case E820_TYPE_RESERVED:
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case E820_TYPE_ACPI:
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case E820_TYPE_NVS:
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case E820_TYPE_UNUSABLE:
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case E820_TYPE_PRAM:
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return true;
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default:
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break;
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}
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return false;
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}
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/*
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* Examine the physical address to determine if it is EFI data. Check
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* it against the boot params structure and EFI tables and memory types.
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*/
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static bool memremap_is_efi_data(resource_size_t phys_addr,
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unsigned long size)
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{
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u64 paddr;
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/* Check if the address is part of EFI boot/runtime data */
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if (!efi_enabled(EFI_BOOT))
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return false;
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paddr = boot_params.efi_info.efi_memmap_hi;
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paddr <<= 32;
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paddr |= boot_params.efi_info.efi_memmap;
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if (phys_addr == paddr)
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return true;
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paddr = boot_params.efi_info.efi_systab_hi;
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paddr <<= 32;
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paddr |= boot_params.efi_info.efi_systab;
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if (phys_addr == paddr)
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return true;
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if (efi_is_table_address(phys_addr))
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return true;
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switch (efi_mem_type(phys_addr)) {
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case EFI_BOOT_SERVICES_DATA:
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case EFI_RUNTIME_SERVICES_DATA:
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return true;
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default:
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break;
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}
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return false;
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}
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|
|
/*
|
|
* Examine the physical address to determine if it is boot data by checking
|
|
* it against the boot params setup_data chain.
|
|
*/
|
|
static bool memremap_is_setup_data(resource_size_t phys_addr,
|
|
unsigned long size)
|
|
{
|
|
struct setup_data *data;
|
|
u64 paddr, paddr_next;
|
|
|
|
paddr = boot_params.hdr.setup_data;
|
|
while (paddr) {
|
|
unsigned int len;
|
|
|
|
if (phys_addr == paddr)
|
|
return true;
|
|
|
|
data = memremap(paddr, sizeof(*data),
|
|
MEMREMAP_WB | MEMREMAP_DEC);
|
|
|
|
paddr_next = data->next;
|
|
len = data->len;
|
|
|
|
memunmap(data);
|
|
|
|
if ((phys_addr > paddr) && (phys_addr < (paddr + len)))
|
|
return true;
|
|
|
|
paddr = paddr_next;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Examine the physical address to determine if it is boot data by checking
|
|
* it against the boot params setup_data chain (early boot version).
|
|
*/
|
|
static bool __init early_memremap_is_setup_data(resource_size_t phys_addr,
|
|
unsigned long size)
|
|
{
|
|
struct setup_data *data;
|
|
u64 paddr, paddr_next;
|
|
|
|
paddr = boot_params.hdr.setup_data;
|
|
while (paddr) {
|
|
unsigned int len;
|
|
|
|
if (phys_addr == paddr)
|
|
return true;
|
|
|
|
data = early_memremap_decrypted(paddr, sizeof(*data));
|
|
|
|
paddr_next = data->next;
|
|
len = data->len;
|
|
|
|
early_memunmap(data, sizeof(*data));
|
|
|
|
if ((phys_addr > paddr) && (phys_addr < (paddr + len)))
|
|
return true;
|
|
|
|
paddr = paddr_next;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Architecture function to determine if RAM remap is allowed. By default, a
|
|
* RAM remap will map the data as encrypted. Determine if a RAM remap should
|
|
* not be done so that the data will be mapped decrypted.
|
|
*/
|
|
bool arch_memremap_can_ram_remap(resource_size_t phys_addr, unsigned long size,
|
|
unsigned long flags)
|
|
{
|
|
if (!sme_active())
|
|
return true;
|
|
|
|
if (flags & MEMREMAP_ENC)
|
|
return true;
|
|
|
|
if (flags & MEMREMAP_DEC)
|
|
return false;
|
|
|
|
if (memremap_is_setup_data(phys_addr, size) ||
|
|
memremap_is_efi_data(phys_addr, size) ||
|
|
memremap_should_map_decrypted(phys_addr, size))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Architecture override of __weak function to adjust the protection attributes
|
|
* used when remapping memory. By default, early_memremap() will map the data
|
|
* as encrypted. Determine if an encrypted mapping should not be done and set
|
|
* the appropriate protection attributes.
|
|
*/
|
|
pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
|
|
unsigned long size,
|
|
pgprot_t prot)
|
|
{
|
|
if (!sme_active())
|
|
return prot;
|
|
|
|
if (early_memremap_is_setup_data(phys_addr, size) ||
|
|
memremap_is_efi_data(phys_addr, size) ||
|
|
memremap_should_map_decrypted(phys_addr, size))
|
|
prot = pgprot_decrypted(prot);
|
|
else
|
|
prot = pgprot_encrypted(prot);
|
|
|
|
return prot;
|
|
}
|
|
|
|
bool phys_mem_access_encrypted(unsigned long phys_addr, unsigned long size)
|
|
{
|
|
return arch_memremap_can_ram_remap(phys_addr, size, 0);
|
|
}
|
|
|
|
#ifdef CONFIG_ARCH_USE_MEMREMAP_PROT
|
|
/* Remap memory with encryption */
|
|
void __init *early_memremap_encrypted(resource_size_t phys_addr,
|
|
unsigned long size)
|
|
{
|
|
return early_memremap_prot(phys_addr, size, __PAGE_KERNEL_ENC);
|
|
}
|
|
|
|
/*
|
|
* Remap memory with encryption and write-protected - cannot be called
|
|
* before pat_init() is called
|
|
*/
|
|
void __init *early_memremap_encrypted_wp(resource_size_t phys_addr,
|
|
unsigned long size)
|
|
{
|
|
/* Be sure the write-protect PAT entry is set for write-protect */
|
|
if (__pte2cachemode_tbl[_PAGE_CACHE_MODE_WP] != _PAGE_CACHE_MODE_WP)
|
|
return NULL;
|
|
|
|
return early_memremap_prot(phys_addr, size, __PAGE_KERNEL_ENC_WP);
|
|
}
|
|
|
|
/* Remap memory without encryption */
|
|
void __init *early_memremap_decrypted(resource_size_t phys_addr,
|
|
unsigned long size)
|
|
{
|
|
return early_memremap_prot(phys_addr, size, __PAGE_KERNEL_NOENC);
|
|
}
|
|
|
|
/*
|
|
* Remap memory without encryption and write-protected - cannot be called
|
|
* before pat_init() is called
|
|
*/
|
|
void __init *early_memremap_decrypted_wp(resource_size_t phys_addr,
|
|
unsigned long size)
|
|
{
|
|
/* Be sure the write-protect PAT entry is set for write-protect */
|
|
if (__pte2cachemode_tbl[_PAGE_CACHE_MODE_WP] != _PAGE_CACHE_MODE_WP)
|
|
return NULL;
|
|
|
|
return early_memremap_prot(phys_addr, size, __PAGE_KERNEL_NOENC_WP);
|
|
}
|
|
#endif /* CONFIG_ARCH_USE_MEMREMAP_PROT */
|
|
|
|
static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] __page_aligned_bss;
|
|
|
|
static inline pmd_t * __init early_ioremap_pmd(unsigned long addr)
|
|
{
|
|
/* Don't assume we're using swapper_pg_dir at this point */
|
|
pgd_t *base = __va(read_cr3_pa());
|
|
pgd_t *pgd = &base[pgd_index(addr)];
|
|
p4d_t *p4d = p4d_offset(pgd, addr);
|
|
pud_t *pud = pud_offset(p4d, addr);
|
|
pmd_t *pmd = pmd_offset(pud, addr);
|
|
|
|
return pmd;
|
|
}
|
|
|
|
static inline pte_t * __init early_ioremap_pte(unsigned long addr)
|
|
{
|
|
return &bm_pte[pte_index(addr)];
|
|
}
|
|
|
|
bool __init is_early_ioremap_ptep(pte_t *ptep)
|
|
{
|
|
return ptep >= &bm_pte[0] && ptep < &bm_pte[PAGE_SIZE/sizeof(pte_t)];
|
|
}
|
|
|
|
void __init early_ioremap_init(void)
|
|
{
|
|
pmd_t *pmd;
|
|
|
|
#ifdef CONFIG_X86_64
|
|
BUILD_BUG_ON((fix_to_virt(0) + PAGE_SIZE) & ((1 << PMD_SHIFT) - 1));
|
|
#else
|
|
WARN_ON((fix_to_virt(0) + PAGE_SIZE) & ((1 << PMD_SHIFT) - 1));
|
|
#endif
|
|
|
|
early_ioremap_setup();
|
|
|
|
pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
|
|
memset(bm_pte, 0, sizeof(bm_pte));
|
|
pmd_populate_kernel(&init_mm, pmd, bm_pte);
|
|
|
|
/*
|
|
* The boot-ioremap range spans multiple pmds, for which
|
|
* we are not prepared:
|
|
*/
|
|
#define __FIXADDR_TOP (-PAGE_SIZE)
|
|
BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
|
|
!= (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
|
|
#undef __FIXADDR_TOP
|
|
if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) {
|
|
WARN_ON(1);
|
|
printk(KERN_WARNING "pmd %p != %p\n",
|
|
pmd, early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END)));
|
|
printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
|
|
fix_to_virt(FIX_BTMAP_BEGIN));
|
|
printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END): %08lx\n",
|
|
fix_to_virt(FIX_BTMAP_END));
|
|
|
|
printk(KERN_WARNING "FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
|
|
printk(KERN_WARNING "FIX_BTMAP_BEGIN: %d\n",
|
|
FIX_BTMAP_BEGIN);
|
|
}
|
|
}
|
|
|
|
void __init __early_set_fixmap(enum fixed_addresses idx,
|
|
phys_addr_t phys, pgprot_t flags)
|
|
{
|
|
unsigned long addr = __fix_to_virt(idx);
|
|
pte_t *pte;
|
|
|
|
if (idx >= __end_of_fixed_addresses) {
|
|
BUG();
|
|
return;
|
|
}
|
|
pte = early_ioremap_pte(addr);
|
|
|
|
if (pgprot_val(flags))
|
|
set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
|
|
else
|
|
pte_clear(&init_mm, addr, pte);
|
|
__flush_tlb_one(addr);
|
|
}
|