include/asm-generic/early_ioremap.h

   1 #ifndef _ASM_EARLY_IOREMAP_H_
   2 #define _ASM_EARLY_IOREMAP_H_
   3
   4 #include <linux/types.h>
   5
   6 /*
   7  * early_ioremap() and early_iounmap() are for temporary early boot-time
   8  * mappings, before the real ioremap() is functional.
   9  */
  10 extern void __iomem *early_ioremap(resource_size_t phys_addr,
  11                                    unsigned long size);
  12 extern void *early_memremap(resource_size_t phys_addr,
  13                             unsigned long size);
  14 extern void *early_memremap_ro(resource_size_t phys_addr,
  15                                unsigned long size);
  16 extern void *early_memremap_prot(resource_size_t phys_addr,
  17                                  unsigned long size, unsigned long prot_val);
  18 extern void early_iounmap(void __iomem *addr, unsigned long size);
  19 extern void early_memunmap(void *addr, unsigned long size);
  20
  21 /*
  22  * Weak function called by early_ioremap_reset(). It does nothing, but
  23  * architectures may provide their own version to do any needed cleanups.
  24  */
  25 extern void early_ioremap_shutdown(void);
  26
  27 #if defined(CONFIG_GENERIC_EARLY_IOREMAP) && defined(CONFIG_MMU)
  28 /* Arch-specific initialization */
  29 extern void early_ioremap_init(void);
  30
  31 /* Generic initialization called by architecture code */
  32 extern void early_ioremap_setup(void);
  33
  34 /*
  35  * Called as last step in paging_init() so library can act
  36  * accordingly for subsequent map/unmap requests.
  37  */
  38 extern void early_ioremap_reset(void);
  39
  40 /*
  41  * Early copy from unmapped memory to kernel mapped memory.
  42  */
  43 extern void copy_from_early_mem(void *dest, phys_addr_t src,
  44                                 unsigned long size);
  45
  46 #else
  47 static inline void early_ioremap_init(void) { }
  48 static inline void early_ioremap_setup(void) { }
  49 static inline void early_ioremap_reset(void) { }
  50 #endif
  51
  52 #endif /* _ASM_EARLY_IOREMAP_H_ */