2 * Re-map IO memory to kernel address space so that we can access it.
3 * This is needed for high PCI addresses that aren't mapped in the
4 * 640k-1MB IO memory area on PC's
6 * (C) Copyright 1995 1996 Linus Torvalds
8 #include <linux/vmalloc.h>
10 #include <linux/sched.h>
12 #include <asm/cacheflush.h>
13 #include <asm/pgtable.h>
15 static int ioremap_pte_range(pmd_t *pmd, unsigned long addr,
16 unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
21 pfn = phys_addr >> PAGE_SHIFT;
22 pte = pte_alloc_kernel(pmd, addr);
26 BUG_ON(!pte_none(*pte));
27 set_pte_at(&init_mm, addr, pte, pfn_pte(pfn, prot));
29 } while (pte++, addr += PAGE_SIZE, addr != end);
33 static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr,
34 unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
40 pmd = pmd_alloc(&init_mm, pud, addr);
44 next = pmd_addr_end(addr, end);
45 if (ioremap_pte_range(pmd, addr, next, phys_addr + addr, prot))
47 } while (pmd++, addr = next, addr != end);
51 static inline int ioremap_pud_range(pgd_t *pgd, unsigned long addr,
52 unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
58 pud = pud_alloc(&init_mm, pgd, addr);
62 next = pud_addr_end(addr, end);
63 if (ioremap_pmd_range(pud, addr, next, phys_addr + addr, prot))
65 } while (pud++, addr = next, addr != end);
69 int ioremap_page_range(unsigned long addr,
70 unsigned long end, phys_addr_t phys_addr, pgprot_t prot)
81 pgd = pgd_offset_k(addr);
83 next = pgd_addr_end(addr, end);
84 err = ioremap_pud_range(pgd, addr, next, phys_addr+addr, prot);
87 } while (pgd++, addr = next, addr != end);
89 flush_cache_vmap(start, end);