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 #include <asm/u-boot.h> 8 9 /* 10 * Logical memory blocks. 11 * 12 * Copyright (C) 2001 Peter Bergner, IBM Corp. 13 */ 14 15 /** 16 * enum lmb_flags - definition of memory region attributes 17 * @LMB_NONE: no special request 18 * @LMB_NOMAP: don't add to mmu configuration 19 */ 20 enum lmb_flags { 21 LMB_NONE = 0x0, 22 LMB_NOMAP = 0x4, 23 }; 24 25 /** 26 * struct lmb_property - Description of one region. 27 * 28 * @base: Base address of the region. 29 * @size: Size of the region 30 * @flags: memory region attributes 31 */ 32 struct lmb_property { 33 phys_addr_t base; 34 phys_size_t size; 35 enum lmb_flags flags; 36 }; 37 38 /* 39 * For regions size management, see LMB configuration in KConfig 40 * all the #if test are done with CONFIG_LMB_USE_MAX_REGIONS (boolean) 41 * 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. 46 * 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. 54 */ 55 56 /** 57 * struct lmb_region - Description of a set of region. 58 * 59 * @cnt: Number of regions. 60 * @max: Size of the region array, max value of cnt. 61 * @region: Array of the region properties 62 */ 63 struct lmb_region { 64 unsigned long cnt; 65 unsigned long max; 66 #if IS_ENABLED(CONFIG_LMB_USE_MAX_REGIONS) 67 struct lmb_property region[CONFIG_LMB_MAX_REGIONS]; 68 #else 69 struct lmb_property *region; 70 #endif 71 }; 72 73 /** 74 * struct lmb - Logical memory block handle. 75 * 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. 80 * 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) 85 */ 86 struct lmb { 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]; 92 #endif 93 }; 94 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); 101 /** 102 * lmb_reserve_flags - Reserve one region with a specific flags bitfield. 103 * 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. 109 */ 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); 119 int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr); 120 /** 121 * lmb_is_reserved_flags - test if tha address is in reserved region with a bitfield flag 122 * 123 * @lmb: the logical memory block struct 124 * @addr: address to be tested 125 * @flags: flags bitfied to be tested 126 * Return: if not reserved or reserved without the requested flag else 1 127 */ 128 int lmb_is_reserved_flags(struct lmb *lmb, phys_addr_t addr, int flags); 129 long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size); 130 131 void lmb_dump_all(struct lmb *lmb); 132 void lmb_dump_all_force(struct lmb *lmb); 133 134 void board_lmb_reserve(struct lmb *lmb); 135 void arch_lmb_reserve(struct lmb *lmb); 136 void arch_lmb_reserve_generic(struct lmb *lmb, ulong sp, ulong end, ulong align); 137 138 #endif /* __KERNEL__ */ 139 140 #endif /* _LINUX_LMB_H */ 141