arch/powerpc/include/asm/sparsemem.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_POWERPC_SPARSEMEM_H
   3 #define _ASM_POWERPC_SPARSEMEM_H 1
   4 #ifdef __KERNEL__
   5
   6 #ifdef CONFIG_SPARSEMEM
   7 /*
   8  * SECTION_SIZE_BITS            2^N: how big each section will be
   9  * MAX_PHYSADDR_BITS            2^N: how much physical address space we have
  10  * MAX_PHYSMEM_BITS             2^N: how much memory we can have in that space
  11  */
  12 #define SECTION_SIZE_BITS       24
  13
  14 #define MAX_PHYSADDR_BITS       46
  15 #define MAX_PHYSMEM_BITS        46
  16
  17 #endif /* CONFIG_SPARSEMEM */
  18
  19 #ifdef CONFIG_MEMORY_HOTPLUG
  20 extern int create_section_mapping(unsigned long start, unsigned long end);
  21 extern int remove_section_mapping(unsigned long start, unsigned long end);
  22
  23 #ifdef CONFIG_PPC_BOOK3S_64
  24 extern void resize_hpt_for_hotplug(unsigned long new_mem_size);
  25 #else
  26 static inline void resize_hpt_for_hotplug(unsigned long new_mem_size) { }
  27 #endif
  28
  29 #ifdef CONFIG_NUMA
  30 extern int hot_add_scn_to_nid(unsigned long scn_addr);
  31 #else
  32 static inline int hot_add_scn_to_nid(unsigned long scn_addr)
  33 {
  34         return 0;
  35 }
  36 #endif /* CONFIG_NUMA */
  37 #endif /* CONFIG_MEMORY_HOTPLUG */
  38
  39 #endif /* __KERNEL__ */
  40 #endif /* _ASM_POWERPC_SPARSEMEM_H */