1 /* SPDX-License-Identifier: GPL-2.0+ */
7 #include <asm/u-boot.h>
10 * Logical memory blocks.
12 * Copyright (C) 2001 Peter Bergner, IBM Corp.
16 * enum lmb_flags - definition of memory region attributes
17 * @LMB_NONE: no special request
18 * @LMB_NOMAP: don't add to mmu configuration
26 * struct lmb_property - Description of one region.
28 * @base: Base address of the region.
29 * @size: Size of the region
30 * @flags: memory region attributes
39 * For regions size management, see LMB configuration in KConfig
40 * all the #if test are done with CONFIG_LMB_USE_MAX_REGIONS (boolean)
42 * case 1. CONFIG_LMB_USE_MAX_REGIONS is defined (legacy mode)
43 * => CONFIG_LMB_MAX_REGIONS is used to configure the region size,
44 * directly in the array lmb_region.region[], with the same
45 * configuration for memory and reserved regions.
47 * case 2. CONFIG_LMB_USE_MAX_REGIONS is not defined, the size of each
48 * region is configurated *independently* with
49 * => CONFIG_LMB_MEMORY_REGIONS: struct lmb.memory_regions
50 * => CONFIG_LMB_RESERVED_REGIONS: struct lmb.reserved_regions
51 * lmb_region.region is only a pointer to the correct buffer,
52 * initialized in lmb_init(). This configuration is useful to manage
53 * more reserved memory regions with CONFIG_LMB_RESERVED_REGIONS.
57 * struct lmb_region - Description of a set of region.
59 * @cnt: Number of regions.
60 * @max: Size of the region array, max value of cnt.
61 * @region: Array of the region properties
66 #if IS_ENABLED(CONFIG_LMB_USE_MAX_REGIONS)
67 struct lmb_property region[CONFIG_LMB_MAX_REGIONS];
69 struct lmb_property *region;
74 * struct lmb - Logical memory block handle.
76 * Clients provide storage for Logical memory block (lmb) handles.
77 * The content of the structure is managed by the lmb library.
78 * A lmb struct is initialized by lmb_init() functions.
79 * The lmb struct is passed to all other lmb APIs.
81 * @memory: Description of memory regions.
82 * @reserved: Description of reserved regions.
83 * @memory_regions: Array of the memory regions (statically allocated)
84 * @reserved_regions: Array of the reserved regions (statically allocated)
87 struct lmb_region memory;
88 struct lmb_region reserved;
89 #if !IS_ENABLED(CONFIG_LMB_USE_MAX_REGIONS)
90 struct lmb_property memory_regions[CONFIG_LMB_MEMORY_REGIONS];
91 struct lmb_property reserved_regions[CONFIG_LMB_RESERVED_REGIONS];
95 void lmb_init(struct lmb *lmb);
96 void lmb_init_and_reserve(struct lmb *lmb, struct bd_info *bd, void *fdt_blob);
97 void lmb_init_and_reserve_range(struct lmb *lmb, phys_addr_t base,
98 phys_size_t size, void *fdt_blob);
99 long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size);
100 long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size);
102 * lmb_reserve_flags - Reserve one region with a specific flags bitfield.
104 * @lmb: the logical memory block struct
105 * @base: base address of the memory region
106 * @size: size of the memory region
107 * @flags: flags for the memory region
108 * Return: 0 if OK, > 0 for coalesced region or a negative error code.
110 long lmb_reserve_flags(struct lmb *lmb, phys_addr_t base,
111 phys_size_t size, enum lmb_flags flags);
112 phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align);
113 phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align,
114 phys_addr_t max_addr);
115 phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align,
116 phys_addr_t max_addr);
117 phys_addr_t lmb_alloc_addr(struct lmb *lmb, phys_addr_t base, phys_size_t size);
118 phys_size_t lmb_get_free_size(struct lmb *lmb, phys_addr_t addr);
121 * lmb_is_reserved() - test if address is in reserved region
123 * The function checks if a reserved region comprising @addr exists.
125 * @lmb: the logical memory block struct
126 * @addr: address to be tested
127 * Return: 1 if reservation exists, 0 otherwise
129 int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr);
132 * lmb_is_reserved_flags() - test if address is in reserved region with flag bits set
134 * The function checks if a reserved region comprising @addr exists which has
135 * all flag bits set which are set in @flags.
137 * @lmb: the logical memory block struct
138 * @addr: address to be tested
139 * @flags: bitmap with bits to be tested
140 * Return: 1 if matching reservation exists, 0 otherwise
142 int lmb_is_reserved_flags(struct lmb *lmb, phys_addr_t addr, int flags);
144 long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size);
146 void lmb_dump_all(struct lmb *lmb);
147 void lmb_dump_all_force(struct lmb *lmb);
149 void board_lmb_reserve(struct lmb *lmb);
150 void arch_lmb_reserve(struct lmb *lmb);
151 void arch_lmb_reserve_generic(struct lmb *lmb, ulong sp, ulong end, ulong align);
153 #endif /* __KERNEL__ */
155 #endif /* _LINUX_LMB_H */