include/lmb.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 #ifndef _LINUX_LMB_H
   3 #define _LINUX_LMB_H
   4 #ifdef __KERNEL__
   5
   6 #include <asm/types.h>
   7 /*
   8  * Logical memory blocks.
   9  *
  10  * Copyright (C) 2001 Peter Bergner, IBM Corp.
  11  */
  12
  13 #define MAX_LMB_REGIONS 8
  14
  15 struct lmb_property {
  16         phys_addr_t base;
  17         phys_size_t size;
  18 };
  19
  20 struct lmb_region {
  21         unsigned long cnt;
  22         phys_size_t size;
  23         struct lmb_property region[MAX_LMB_REGIONS+1];
  24 };
  25
  26 struct lmb {
  27         struct lmb_region memory;
  28         struct lmb_region reserved;
  29 };
  30
  31 extern struct lmb lmb;
  32
  33 extern void lmb_init(struct lmb *lmb);
  34 extern void lmb_init_and_reserve(struct lmb *lmb, phys_addr_t base,
  35                                  phys_size_t size, void *fdt_blob);
  36 extern long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size);
  37 extern long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size);
  38 extern phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align);
  39 extern phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align,
  40                             phys_addr_t max_addr);
  41 extern phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align,
  42                               phys_addr_t max_addr);
  43 extern phys_addr_t lmb_alloc_addr(struct lmb *lmb, phys_addr_t base,
  44                                   phys_size_t size);
  45 extern phys_size_t lmb_get_unreserved_size(struct lmb *lmb, phys_addr_t addr);
  46 extern int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr);
  47 extern long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size);
  48
  49 extern void lmb_dump_all(struct lmb *lmb);
  50
  51 static inline phys_size_t
  52 lmb_size_bytes(struct lmb_region *type, unsigned long region_nr)
  53 {
  54         return type->region[region_nr].size;
  55 }
  56
  57 void board_lmb_reserve(struct lmb *lmb);
  58 void arch_lmb_reserve(struct lmb *lmb);
  59
  60 #endif /* __KERNEL__ */
  61
  62 #endif /* _LINUX_LMB_H */