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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _CBMEM_H_
#define _CBMEM_H_
#include <commonlib/bsd/cbmem_id.h> /* IWYU pragma: export */
#include <stddef.h>
#include <stdint.h>
#include <boot/coreboot_tables.h>
#define CBMEM_FSP_HOB_PTR 0x614
struct cbmem_entry;
/*
* The dynamic cbmem infrastructure allows for growing cbmem dynamically as
* things are added. It requires an external function, cbmem_top(), to be
* implemented by the board or chipset to define the upper address where
* cbmem lives. This address is required to be a 32-bit address. Additionally,
* the address needs to be consistent in both romstage and ramstage. The
* dynamic cbmem infrastructure allocates new regions below the last allocated
* region. Regions are defined by a cbmem_entry struct that is opaque. Regions
* may be removed, but the last one added is the only that can be removed.
*/
#define DYN_CBMEM_ALIGN_SIZE (4096)
#define CBMEM_ROOT_SIZE DYN_CBMEM_ALIGN_SIZE
/* The root region is at least DYN_CBMEM_ALIGN_SIZE . */
#define CBMEM_ROOT_MIN_SIZE DYN_CBMEM_ALIGN_SIZE
#define CBMEM_LG_ALIGN CBMEM_ROOT_MIN_SIZE
/* Small allocation parameters. */
#define CBMEM_SM_ROOT_SIZE 1024
#define CBMEM_SM_ALIGN 32
/* Determine the size for CBMEM root and the small allocations */
static inline size_t cbmem_overhead_size(void)
{
return 2 * CBMEM_ROOT_MIN_SIZE;
}
/* By default cbmem is attempted to be recovered. Returns 0 if cbmem was
* recovered or 1 if cbmem had to be reinitialized. */
int cbmem_initialize(void);
int cbmem_initialize_id_size(u32 id, u64 size);
/* Initialize cbmem to be empty. */
void cbmem_initialize_empty(void);
void cbmem_initialize_empty_id_size(u32 id, u64 size);
/* Return the top address for dynamic cbmem. The address returned needs to
* be consistent across romstage and ramstage, and it is required to be
* below 4GiB for 32bit coreboot builds. On 64bit coreboot builds there's no
* upper limit. This should not be called before memory is initialized.
*/
/* The assumption is made that the result of cbmem_top_romstage fits in the size
of uintptr_t in the ramstage. */
extern uintptr_t _cbmem_top_ptr;
uintptr_t cbmem_top(void);
/* With CONFIG_RAMSTAGE_CBMEM_TOP_ARG set, the result of cbmem_top is passed via
* calling arguments to the next stage and saved in the global _cbmem_top_ptr
* global variable. Only a romstage callback needs to be implemented by the
* platform. It is up to the stages after romstage to save the calling argument
* in the _cbmem_top_ptr symbol. Without CONFIG_RAMSTAGE_CBMEM_TOP_ARG the same
* implementation as used in romstage will be used.
*/
uintptr_t cbmem_top_chipset(void);
/* Add a cbmem entry of a given size and id. These return NULL on failure. The
* add function performs a find first and do not check against the original
* size. */
const struct cbmem_entry *cbmem_entry_add(u32 id, u64 size);
/* Find a cbmem entry of a given id. These return NULL on failure. */
const struct cbmem_entry *cbmem_entry_find(u32 id);
/* Remove a region defined by a cbmem_entry. Returns 0 on success, < 0 on
* error. Note: A cbmem_entry cannot be removed unless it was the last one
* added. */
int cbmem_entry_remove(const struct cbmem_entry *entry);
/* cbmem_entry accessors to get pointer and size of a cbmem_entry. */
void *cbmem_entry_start(const struct cbmem_entry *entry);
u64 cbmem_entry_size(const struct cbmem_entry *entry);
/* Returns 0 if old cbmem was recovered. Recovery is only attempted if
* s3resume is non-zero. */
int cbmem_recovery(int s3resume);
/* Add a cbmem entry of a given size and id. These return NULL on failure. The
* add function performs a find first and do not check against the original
* size. */
void *cbmem_add(u32 id, u64 size);
/* Find a cbmem entry of a given id. These return NULL on failure. */
void *cbmem_find(u32 id);
/* Indicate to each hook if cbmem is being recovered or not. */
typedef void (* const cbmem_init_hook_t)(int is_recovery);
void cbmem_run_init_hooks(int is_recovery);
/* Ramstage only functions. */
/* Add the cbmem memory used to the memory map at boot. */
void cbmem_add_bootmem(void);
/* Return the cbmem memory used */
int cbmem_get_region(void **baseptr, size_t *size);
void cbmem_list(void);
void cbmem_add_records_to_cbtable(struct lb_header *header);
#define _CBMEM_INIT_HOOK_UNUSED(init_fn_) __attribute__((unused)) \
static cbmem_init_hook_t init_fn_ ## _unused_ = init_fn_
#define _CBMEM_INIT_HOOK(init_fn_) \
static cbmem_init_hook_t init_fn_ ## _ptr_ __attribute__((used, \
section(".rodata.cbmem_init_hooks"))) = init_fn_
/* Early hooks get executed before other hooks. Use sparingly for hooks that create
CBMEM regions which need to remain in a constant location across boot modes. */
#define _CBMEM_INIT_HOOK_EARLY(init_fn_) \
static cbmem_init_hook_t init_fn_ ## _ptr_ __attribute__((used, \
section(".rodata.cbmem_init_hooks_early"))) = init_fn_
/* Use CBMEM_CREATION_HOOK for code that needs to be run when cbmem is initialized
for the first time. */
#if ENV_CREATES_CBMEM
#define CBMEM_CREATION_HOOK(x) _CBMEM_INIT_HOOK(x)
#else
#define CBMEM_CREATION_HOOK(x) _CBMEM_INIT_HOOK_UNUSED(x)
#endif
/* Use CBMEM_READY_HOOK for code that needs to run in all stages that have cbmem. */
#if ENV_HAS_CBMEM
#define CBMEM_READY_HOOK(x) _CBMEM_INIT_HOOK(x)
#define CBMEM_READY_HOOK_EARLY(x) _CBMEM_INIT_HOOK_EARLY(x)
#else
#define CBMEM_READY_HOOK(x) _CBMEM_INIT_HOOK_UNUSED(x)
#define CBMEM_READY_HOOK_EARLY(x) _CBMEM_INIT_HOOK_UNUSED(x)
#endif
/* Returns 1 after running cbmem init hooks, 0 otherwise. */
static inline int cbmem_online(void)
{
extern int cbmem_initialized;
if (!ENV_HAS_CBMEM)
return 0;
return cbmem_initialized;
}
#endif /* _CBMEM_H_ */
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