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- /* SPDX-License-Identifier: GPL-2.0+ */
- #ifndef _LINUX_LMB_H
- #define _LINUX_LMB_H
- #ifdef __KERNEL__
- #include <asm/types.h>
- #include <asm/u-boot.h>
- /*
- * Logical memory blocks.
- *
- * Copyright (C) 2001 Peter Bergner, IBM Corp.
- */
- /**
- * enum lmb_flags - definition of memory region attributes
- * @LMB_NONE: no special request
- * @LMB_NOMAP: don't add to mmu configuration
- */
- enum lmb_flags {
- LMB_NONE = 0x0,
- LMB_NOMAP = 0x4,
- };
- /**
- * struct lmb_property - Description of one region.
- *
- * @base: Base address of the region.
- * @size: Size of the region
- * @flags: memory region attributes
- */
- struct lmb_property {
- phys_addr_t base;
- phys_size_t size;
- enum lmb_flags flags;
- };
- /*
- * For regions size management, see LMB configuration in KConfig
- * all the #if test are done with CONFIG_LMB_USE_MAX_REGIONS (boolean)
- *
- * case 1. CONFIG_LMB_USE_MAX_REGIONS is defined (legacy mode)
- * => CONFIG_LMB_MAX_REGIONS is used to configure the region size,
- * directly in the array lmb_region.region[], with the same
- * configuration for memory and reserved regions.
- *
- * case 2. CONFIG_LMB_USE_MAX_REGIONS is not defined, the size of each
- * region is configurated *independently* with
- * => CONFIG_LMB_MEMORY_REGIONS: struct lmb.memory_regions
- * => CONFIG_LMB_RESERVED_REGIONS: struct lmb.reserved_regions
- * lmb_region.region is only a pointer to the correct buffer,
- * initialized in lmb_init(). This configuration is useful to manage
- * more reserved memory regions with CONFIG_LMB_RESERVED_REGIONS.
- */
- /**
- * struct lmb_region - Description of a set of region.
- *
- * @cnt: Number of regions.
- * @max: Size of the region array, max value of cnt.
- * @region: Array of the region properties
- */
- struct lmb_region {
- unsigned long cnt;
- unsigned long max;
- #if IS_ENABLED(CONFIG_LMB_USE_MAX_REGIONS)
- struct lmb_property region[CONFIG_LMB_MAX_REGIONS];
- #else
- struct lmb_property *region;
- #endif
- };
- /**
- * struct lmb - Logical memory block handle.
- *
- * Clients provide storage for Logical memory block (lmb) handles.
- * The content of the structure is managed by the lmb library.
- * A lmb struct is initialized by lmb_init() functions.
- * The lmb struct is passed to all other lmb APIs.
- *
- * @memory: Description of memory regions.
- * @reserved: Description of reserved regions.
- * @memory_regions: Array of the memory regions (statically allocated)
- * @reserved_regions: Array of the reserved regions (statically allocated)
- */
- struct lmb {
- struct lmb_region memory;
- struct lmb_region reserved;
- #if !IS_ENABLED(CONFIG_LMB_USE_MAX_REGIONS)
- struct lmb_property memory_regions[CONFIG_LMB_MEMORY_REGIONS];
- struct lmb_property reserved_regions[CONFIG_LMB_RESERVED_REGIONS];
- #endif
- };
- void lmb_init(struct lmb *lmb);
- void lmb_init_and_reserve(struct lmb *lmb, struct bd_info *bd, void *fdt_blob);
- void lmb_init_and_reserve_range(struct lmb *lmb, phys_addr_t base,
- phys_size_t size, void *fdt_blob);
- long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size);
- long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size);
- /**
- * lmb_reserve_flags - Reserve one region with a specific flags bitfield.
- *
- * @lmb: the logical memory block struct
- * @base: base address of the memory region
- * @size: size of the memory region
- * @flags: flags for the memory region
- * Return: 0 if OK, > 0 for coalesced region or a negative error code.
- */
- long lmb_reserve_flags(struct lmb *lmb, phys_addr_t base,
- phys_size_t size, enum lmb_flags flags);
- phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align);
- phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align,
- phys_addr_t max_addr);
- phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align,
- phys_addr_t max_addr);
- phys_addr_t lmb_alloc_addr(struct lmb *lmb, phys_addr_t base, phys_size_t size);
- phys_size_t lmb_get_free_size(struct lmb *lmb, phys_addr_t addr);
- /**
- * lmb_is_reserved() - test if address is in reserved region
- *
- * The function checks if a reserved region comprising @addr exists.
- *
- * @lmb: the logical memory block struct
- * @addr: address to be tested
- * Return: 1 if reservation exists, 0 otherwise
- */
- int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr);
- /**
- * lmb_is_reserved_flags() - test if address is in reserved region with flag bits set
- *
- * The function checks if a reserved region comprising @addr exists which has
- * all flag bits set which are set in @flags.
- *
- * @lmb: the logical memory block struct
- * @addr: address to be tested
- * @flags: bitmap with bits to be tested
- * Return: 1 if matching reservation exists, 0 otherwise
- */
- int lmb_is_reserved_flags(struct lmb *lmb, phys_addr_t addr, int flags);
- long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size);
- void lmb_dump_all(struct lmb *lmb);
- void lmb_dump_all_force(struct lmb *lmb);
- void board_lmb_reserve(struct lmb *lmb);
- void arch_lmb_reserve(struct lmb *lmb);
- void arch_lmb_reserve_generic(struct lmb *lmb, ulong sp, ulong end, ulong align);
- #endif /* __KERNEL__ */
- #endif /* _LINUX_LMB_H */
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