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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2009 coresystems GmbH
* Copyright (C) 2013 Google, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#ifndef _CBMEM_H_
#define _CBMEM_H_
#include <cbmem_id.h>
#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME) && \
! IS_ENABLED(CONFIG_RELOCATABLE_RAMSTAGE)
#define HIGH_MEMORY_SAVE (CONFIG_RAMTOP - CONFIG_RAMBASE)
#else
#define HIGH_MEMORY_SAVE 0
#endif
/* Delegation of resume backup memory so we don't have to
* (slowly) handle backing up OS memory in romstage.c
*/
#define CBMEM_BOOT_MODE 0x610
#define CBMEM_RESUME_BACKUP 0x614
#define CBMEM_FSP_HOB_PTR 0x614
#ifndef __ASSEMBLER__
#include <stddef.h>
#include <stdint.h>
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. */
void *cbmem_top(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);
void cbmem_run_init_hooks(void);
void cbmem_fail_resume(void);
#ifndef __PRE_RAM__
/* Ramstage only functions. */
/* Add the cbmem memory used to the memory map at boot. */
void cbmem_add_bootmem(void);
void cbmem_list(void);
#endif /* __PRE_RAM__ */
/* These are for compatibility with old boards only. Any new chipset and board
* must implement cbmem_top() for both romstage and ramstage to support
* early features like COLLECT_TIMESTAMPS and CBMEM_CONSOLE.
*/
#if IS_ENABLED(CONFIG_ARCH_X86) && IS_ENABLED(CONFIG_LATE_CBMEM_INIT)
/* Note that many of the current providers of get_top_of_ram() conditionally
* return 0 when the sleep type is non S3. i.e. cold and warm boots would
* return 0 from get_top_of_ram(). */
unsigned long get_top_of_ram(void);
void set_top_of_ram(uint64_t ramtop);
void backup_top_of_ram(uint64_t ramtop);
#endif
#endif /* __ASSEMBLER__ */
#endif /* _CBMEM_H_ */
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