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78246baa8d
* provide a description for function lmb_is_reserved() * improve the description of funciton lmb_is_reserved_flags() Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
156 lines
5.0 KiB
C
156 lines
5.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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#ifndef _LINUX_LMB_H
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#define _LINUX_LMB_H
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#ifdef __KERNEL__
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#include <asm/types.h>
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#include <asm/u-boot.h>
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/*
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* Logical memory blocks.
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*
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* Copyright (C) 2001 Peter Bergner, IBM Corp.
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*/
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/**
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* enum lmb_flags - definition of memory region attributes
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* @LMB_NONE: no special request
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* @LMB_NOMAP: don't add to mmu configuration
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*/
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enum lmb_flags {
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LMB_NONE = 0x0,
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LMB_NOMAP = 0x4,
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};
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/**
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* struct lmb_property - Description of one region.
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*
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* @base: Base address of the region.
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* @size: Size of the region
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* @flags: memory region attributes
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*/
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struct lmb_property {
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phys_addr_t base;
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phys_size_t size;
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enum lmb_flags flags;
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};
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/*
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* For regions size management, see LMB configuration in KConfig
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* all the #if test are done with CONFIG_LMB_USE_MAX_REGIONS (boolean)
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*
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* case 1. CONFIG_LMB_USE_MAX_REGIONS is defined (legacy mode)
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* => CONFIG_LMB_MAX_REGIONS is used to configure the region size,
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* directly in the array lmb_region.region[], with the same
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* configuration for memory and reserved regions.
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*
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* case 2. CONFIG_LMB_USE_MAX_REGIONS is not defined, the size of each
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* region is configurated *independently* with
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* => CONFIG_LMB_MEMORY_REGIONS: struct lmb.memory_regions
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* => CONFIG_LMB_RESERVED_REGIONS: struct lmb.reserved_regions
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* lmb_region.region is only a pointer to the correct buffer,
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* initialized in lmb_init(). This configuration is useful to manage
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* more reserved memory regions with CONFIG_LMB_RESERVED_REGIONS.
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*/
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/**
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* struct lmb_region - Description of a set of region.
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*
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* @cnt: Number of regions.
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* @max: Size of the region array, max value of cnt.
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* @region: Array of the region properties
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*/
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struct lmb_region {
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unsigned long cnt;
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unsigned long max;
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#if IS_ENABLED(CONFIG_LMB_USE_MAX_REGIONS)
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struct lmb_property region[CONFIG_LMB_MAX_REGIONS];
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#else
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struct lmb_property *region;
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#endif
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};
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/**
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* struct lmb - Logical memory block handle.
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*
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* Clients provide storage for Logical memory block (lmb) handles.
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* The content of the structure is managed by the lmb library.
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* A lmb struct is initialized by lmb_init() functions.
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* The lmb struct is passed to all other lmb APIs.
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*
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* @memory: Description of memory regions.
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* @reserved: Description of reserved regions.
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* @memory_regions: Array of the memory regions (statically allocated)
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* @reserved_regions: Array of the reserved regions (statically allocated)
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*/
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struct lmb {
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struct lmb_region memory;
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struct lmb_region reserved;
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#if !IS_ENABLED(CONFIG_LMB_USE_MAX_REGIONS)
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struct lmb_property memory_regions[CONFIG_LMB_MEMORY_REGIONS];
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struct lmb_property reserved_regions[CONFIG_LMB_RESERVED_REGIONS];
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#endif
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};
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void lmb_init(struct lmb *lmb);
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void lmb_init_and_reserve(struct lmb *lmb, struct bd_info *bd, void *fdt_blob);
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void lmb_init_and_reserve_range(struct lmb *lmb, phys_addr_t base,
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phys_size_t size, void *fdt_blob);
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long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size);
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long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size);
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/**
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* lmb_reserve_flags - Reserve one region with a specific flags bitfield.
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*
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* @lmb: the logical memory block struct
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* @base: base address of the memory region
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* @size: size of the memory region
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* @flags: flags for the memory region
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* Return: 0 if OK, > 0 for coalesced region or a negative error code.
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*/
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long lmb_reserve_flags(struct lmb *lmb, phys_addr_t base,
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phys_size_t size, enum lmb_flags flags);
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phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align);
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phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align,
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phys_addr_t max_addr);
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phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align,
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phys_addr_t max_addr);
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phys_addr_t lmb_alloc_addr(struct lmb *lmb, phys_addr_t base, phys_size_t size);
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phys_size_t lmb_get_free_size(struct lmb *lmb, phys_addr_t addr);
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/**
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* lmb_is_reserved() - test if address is in reserved region
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*
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* The function checks if a reserved region comprising @addr exists.
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*
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* @lmb: the logical memory block struct
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* @addr: address to be tested
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* Return: 1 if reservation exists, 0 otherwise
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*/
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int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr);
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/**
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* lmb_is_reserved_flags() - test if address is in reserved region with flag bits set
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*
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* The function checks if a reserved region comprising @addr exists which has
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* all flag bits set which are set in @flags.
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*
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* @lmb: the logical memory block struct
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* @addr: address to be tested
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* @flags: bitmap with bits to be tested
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* Return: 1 if matching reservation exists, 0 otherwise
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*/
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int lmb_is_reserved_flags(struct lmb *lmb, phys_addr_t addr, int flags);
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long lmb_free(struct lmb *lmb, phys_addr_t base, phys_size_t size);
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void lmb_dump_all(struct lmb *lmb);
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void lmb_dump_all_force(struct lmb *lmb);
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void board_lmb_reserve(struct lmb *lmb);
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void arch_lmb_reserve(struct lmb *lmb);
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void arch_lmb_reserve_generic(struct lmb *lmb, ulong sp, ulong end, ulong align);
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#endif /* __KERNEL__ */
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#endif /* _LINUX_LMB_H */
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