include/asm-generic/early_ioremap.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_EARLY_IOREMAP_H_
   3 #define _ASM_EARLY_IOREMAP_H_
   4
   5 #include <linux/types.h>
   6
   7 /*
   8  * early_ioremap() and early_iounmap() are for temporary early boot-time
   9  * mappings, before the real ioremap() is functional.
  10  */
  11 extern void __iomem *early_ioremap(resource_size_t phys_addr,
  12                                    unsigned long size);
  13 extern void *early_memremap(resource_size_t phys_addr,
  14                             unsigned long size);
  15 extern void *early_memremap_ro(resource_size_t phys_addr,
  16                                unsigned long size);
  17 extern void *early_memremap_prot(resource_size_t phys_addr,
  18                                  unsigned long size, unsigned long prot_val);
  19 extern void early_iounmap(void __iomem *addr, unsigned long size);
  20 extern void early_memunmap(void *addr, unsigned long size);
  21
  22 /*
  23  * Weak function called by early_ioremap_reset(). It does nothing, but
  24  * architectures may provide their own version to do any needed cleanups.
  25  */
  26 extern void early_ioremap_shutdown(void);
  27
  28 #if defined(CONFIG_GENERIC_EARLY_IOREMAP) && defined(CONFIG_MMU)
  29 /* Arch-specific initialization */
  30 extern void early_ioremap_init(void);
  31
  32 /* Generic initialization called by architecture code */
  33 extern void early_ioremap_setup(void);
  34
  35 /*
  36  * Called as last step in paging_init() so library can act
  37  * accordingly for subsequent map/unmap requests.
  38  */
  39 extern void early_ioremap_reset(void);
  40
  41 /*
  42  * Early copy from unmapped memory to kernel mapped memory.
  43  */
  44 extern void copy_from_early_mem(void *dest, phys_addr_t src,
  45                                 unsigned long size);
  46
  47 #else
  48 static inline void early_ioremap_init(void) { }
  49 static inline void early_ioremap_setup(void) { }
  50 static inline void early_ioremap_reset(void) { }
  51 #endif
  52
  53 #endif /* _ASM_EARLY_IOREMAP_H_ */