arch/powerpc/mm/ioremap.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 #include <linux/io.h>
   4 #include <asm/io-workarounds.h>
   5
   6 unsigned long ioremap_bot;
   7 EXPORT_SYMBOL(ioremap_bot);
   8
   9 void __iomem *ioremap(phys_addr_t addr, unsigned long size)
  10 {
  11         pgprot_t prot = pgprot_noncached(PAGE_KERNEL);
  12         void *caller = __builtin_return_address(0);
  13
  14         if (iowa_is_active())
  15                 return iowa_ioremap(addr, size, prot, caller);
  16         return __ioremap_caller(addr, size, prot, caller);
  17 }
  18 EXPORT_SYMBOL(ioremap);
  19
  20 void __iomem *ioremap_wc(phys_addr_t addr, unsigned long size)
  21 {
  22         pgprot_t prot = pgprot_noncached_wc(PAGE_KERNEL);
  23         void *caller = __builtin_return_address(0);
  24
  25         if (iowa_is_active())
  26                 return iowa_ioremap(addr, size, prot, caller);
  27         return __ioremap_caller(addr, size, prot, caller);
  28 }
  29 EXPORT_SYMBOL(ioremap_wc);
  30
  31 void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size)
  32 {
  33         pgprot_t prot = pgprot_cached(PAGE_KERNEL);
  34         void *caller = __builtin_return_address(0);
  35
  36         if (iowa_is_active())
  37                 return iowa_ioremap(addr, size, prot, caller);
  38         return __ioremap_caller(addr, size, prot, caller);
  39 }
  40
  41 void __iomem *ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags)
  42 {
  43         pte_t pte = __pte(flags);
  44         void *caller = __builtin_return_address(0);
  45
  46         /* writeable implies dirty for kernel addresses */
  47         if (pte_write(pte))
  48                 pte = pte_mkdirty(pte);
  49
  50         /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
  51         pte = pte_exprotect(pte);
  52         pte = pte_mkprivileged(pte);
  53
  54         if (iowa_is_active())
  55                 return iowa_ioremap(addr, size, pte_pgprot(pte), caller);
  56         return __ioremap_caller(addr, size, pte_pgprot(pte), caller);
  57 }
  58 EXPORT_SYMBOL(ioremap_prot);