Logical memory blocks¶
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enum
lmb_flags
¶ definition of memory region attributes
Constants
LMB_NONE
no special request
LMB_NOMAP
don’t add to mmu configuration
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struct
lmb_property
¶ Description of one region.
Definition
struct lmb_property {
phys_addr_t base;
phys_size_t size;
enum lmb_flags flags;
};
Members
base
Base address of the region.
size
Size of the region
flags
memory region attributes
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struct
lmb_region
¶ Description of a set of region.
Definition
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;
};
Members
cnt
Number of regions.
max
Size of the region array, max value of cnt.
region
Array of the region properties
region
Array of the region properties
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struct
lmb
¶ Logical memory block handle.
Definition
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;
};
Members
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)
Description
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.
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long
lmb_reserve_flags
(struct lmb *lmb, phys_addr_t base, phys_size_t size, enum lmb_flags flags)¶ Reserve one region with a specific flags bitfield.
Parameters
struct lmb *lmb
the logical memory block struct
phys_addr_t base
base address of the memory region
phys_size_t size
size of the memory region
enum lmb_flags flags
flags for the memory region
Return
0 if OK, > 0 for coalesced region or a negative error code.
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int
lmb_is_reserved_flags
(struct lmb *lmb, phys_addr_t addr, int flags)¶ test if tha address is in reserved region with a bitfield flag
Parameters
struct lmb *lmb
the logical memory block struct
phys_addr_t addr
address to be tested
int flags
flags bitfied to be tested
Return
if not reserved or reserved without the requested flag else 1