1 /* SPDX-License-Identifier: GPL-2.0+ */
8 #include <asm/u-boot.h>
9 #include <linux/bitops.h>
12 * Logical memory blocks.
14 * Copyright (C) 2001 Peter Bergner, IBM Corp.
18 * enum lmb_flags - definition of memory region attributes
19 * @LMB_NONE: no special request
20 * @LMB_NOMAP: don't add to mmu configuration
21 * @LMB_NOOVERWRITE: the memory region cannot be overwritten/re-reserved
22 * @LMB_NONOTIFY: do not notify other modules of changes to this memory region
27 LMB_NOOVERWRITE = BIT(2),
28 LMB_NONOTIFY = BIT(3),
32 * struct lmb_region - Description of one region.
34 * @base: Base address of the region.
35 * @size: Size of the region
36 * @flags: memory region attributes
45 * struct lmb - The LMB structure
47 * @free_mem: List of free memory regions
48 * @used_mem: List of used/reserved memory regions
49 * @test: Is structure being used for LMB tests
52 struct alist free_mem;
53 struct alist used_mem;
58 * lmb_init() - Initialise the LMB module
60 * Initialise the LMB lists needed for keeping the memory map. There
61 * are two lists, in form of alloced list data structure. One for the
62 * available memory, and one for the used memory. Initialise the two
63 * lists as part of board init. Add memory to the available memory
64 * list and reserve common areas by adding them to the used memory
67 * Return: 0 on success, -ve on error
72 * lmb_add_memory() - Add memory range for LMB allocations
74 * Add the entire available memory range to the pool of memory that
75 * can be used by the LMB module for allocations.
79 void lmb_add_memory(void);
81 long lmb_add(phys_addr_t base, phys_size_t size);
82 long lmb_reserve(phys_addr_t base, phys_size_t size);
84 * lmb_reserve_flags - Reserve one region with a specific flags bitfield.
86 * @base: base address of the memory region
87 * @size: size of the memory region
88 * @flags: flags for the memory region
89 * Return: 0 if OK, > 0 for coalesced region or a negative error code.
91 long lmb_reserve_flags(phys_addr_t base, phys_size_t size,
92 enum lmb_flags flags);
93 phys_addr_t lmb_alloc(phys_size_t size, ulong align);
94 phys_addr_t lmb_alloc_base(phys_size_t size, ulong align, phys_addr_t max_addr);
95 phys_addr_t lmb_alloc_addr(phys_addr_t base, phys_size_t size);
96 phys_size_t lmb_get_free_size(phys_addr_t addr);
99 * lmb_alloc_flags() - Allocate memory region with specified attributes
100 * @size: Size of the region requested
101 * @align: Alignment of the memory region requested
102 * @flags: Memory region attributes to be set
104 * Allocate a region of memory with the attributes specified through the
107 * Return: base address on success, 0 on error
109 phys_addr_t lmb_alloc_flags(phys_size_t size, ulong align, uint flags);
112 * lmb_alloc_base_flags() - Allocate specified memory region with specified attributes
113 * @size: Size of the region requested
114 * @align: Alignment of the memory region requested
115 * @max_addr: Maximum address of the requested region
116 * @flags: Memory region attributes to be set
118 * Allocate a region of memory with the attributes specified through the
119 * parameter. The max_addr parameter is used to specify the maximum address
120 * below which the requested region should be allocated.
122 * Return: base address on success, 0 on error
124 phys_addr_t lmb_alloc_base_flags(phys_size_t size, ulong align,
125 phys_addr_t max_addr, uint flags);
128 * lmb_alloc_addr_flags() - Allocate specified memory address with specified attributes
129 * @base: Base Address requested
130 * @size: Size of the region requested
131 * @flags: Memory region attributes to be set
133 * Allocate a region of memory with the attributes specified through the
134 * parameter. The base parameter is used to specify the base address
135 * of the requested region.
137 * Return: base address on success, 0 on error
139 phys_addr_t lmb_alloc_addr_flags(phys_addr_t base, phys_size_t size,
143 * lmb_is_reserved_flags() - test if address is in reserved region with flag bits set
145 * The function checks if a reserved region comprising @addr exists which has
146 * all flag bits set which are set in @flags.
148 * @addr: address to be tested
149 * @flags: bitmap with bits to be tested
150 * Return: 1 if matching reservation exists, 0 otherwise
152 int lmb_is_reserved_flags(phys_addr_t addr, int flags);
155 * lmb_free_flags() - Free up a region of memory
156 * @base: Base Address of region to be freed
157 * @size: Size of the region to be freed
158 * @flags: Memory region attributes
160 * Free up a region of memory.
162 * Return: 0 if successful, -1 on failure
164 long lmb_free_flags(phys_addr_t base, phys_size_t size, uint flags);
166 long lmb_free(phys_addr_t base, phys_size_t size);
168 void lmb_dump_all(void);
169 void lmb_dump_all_force(void);
171 void lmb_arch_add_memory(void);
173 struct lmb *lmb_get(void);
174 int lmb_push(struct lmb *store);
175 void lmb_pop(struct lmb *store);
177 static inline int lmb_read_check(phys_addr_t addr, phys_size_t len)
179 return lmb_alloc_addr(addr, len) == addr ? 0 : -1;
182 #endif /* __KERNEL__ */
184 #endif /* _LINUX_LMB_H */