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/* SPDX-License-Identifier: GPL-2.0+ */
#ifndef _LINUX_LMB_H
#define _LINUX_LMB_H
#ifdef __KERNEL__
#include <alist.h>
#include <asm/types.h>
#include <asm/u-boot.h>
#include <linux/bitops.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 = 0,
LMB_NOMAP = BIT(1),
LMB_NOOVERWRITE = BIT(2),
};
/**
* struct lmb_region - Description of one region.
*
* @base: Base address of the region.
* @size: Size of the region
* @flags: memory region attributes
*/
struct lmb_region {
phys_addr_t base;
phys_size_t size;
enum lmb_flags flags;
};
/**
* struct lmb - The LMB structure
*
* @free_mem: List of free memory regions
* @used_mem: List of used/reserved memory regions
*/
struct lmb {
struct alist free_mem;
struct alist used_mem;
};
/**
* lmb_init() - Initialise the LMB module
*
* Initialise the LMB lists needed for keeping the memory map. There
* are two lists, in form of alloced list data structure. One for the
* available memory, and one for the used memory. Initialise the two
* lists as part of board init. Add memory to the available memory
* list and reserve common areas by adding them to the used memory
* list.
*
* Return: 0 on success, -ve on error
*/
int lmb_init(void);
/**
* lmb_add_memory() - Add memory range for LMB allocations
*
* Add the entire available memory range to the pool of memory that
* can be used by the LMB module for allocations.
*
* Return: None
*/
void lmb_add_memory(void);
long lmb_add(phys_addr_t base, phys_size_t size);
long lmb_reserve(phys_addr_t base, phys_size_t size);
/**
* lmb_reserve_flags - Reserve one region with a specific flags bitfield.
*
* @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(phys_addr_t base, phys_size_t size,
enum lmb_flags flags);
phys_addr_t lmb_alloc(phys_size_t size, ulong align);
phys_addr_t lmb_alloc_base(phys_size_t size, ulong align, phys_addr_t max_addr);
phys_addr_t lmb_alloc_addr(phys_addr_t base, phys_size_t size);
phys_size_t lmb_get_free_size(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.
*
* @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(phys_addr_t addr, int flags);
long lmb_free(phys_addr_t base, phys_size_t size);
void lmb_dump_all(void);
void lmb_dump_all_force(void);
struct lmb *lmb_get(void);
int lmb_push(struct lmb *store);
void lmb_pop(struct lmb *store);
#endif /* __KERNEL__ */
#endif /* _LINUX_LMB_H */
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