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/*
* This file is part of the coreboot project.
*
* 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.
*/
#ifndef _X86_MP_H_
#define _X86_MP_H_
#include <arch/smp/atomic.h>
#include <cpu/x86/smm.h>
#define CACHELINE_SIZE 64
struct cpu_info;
struct bus;
static inline void mfence(void)
{
__asm__ __volatile__("mfence\t\n": : :"memory");
}
/* The sequence of the callbacks are in calling order. */
struct mp_ops {
/*
* Optionally provide a callback prior to kicking off MP
* startup. This callback is done prior to loading the SIPI
* vector but after gathering the MP state information. Please
* see the sequence below.
*/
void (*pre_mp_init)(void);
/*
* Return the number of logical x86 execution contexts that
* need to be brought out of SIPI state as well as have SMM
* handlers installed.
*/
int (*get_cpu_count)(void);
/*
* Optionally fill in permanent SMM region and save state size. If
* this callback is not present no SMM handlers will be installed.
* The perm_smsize is the size available to house the permanent SMM
* handler.
*/
void (*get_smm_info)(uintptr_t *perm_smbase, size_t *perm_smsize,
size_t *smm_save_state_size);
/*
* Optionally fill in pointer to microcode and indicate if the APs
* can load the microcode in parallel.
*/
void (*get_microcode_info)(const void **microcode, int *parallel);
/*
* Optionally adjust SMM handler parameters to override the default
* values. The is_perm variable indicates if the parameters to adjust
* are for the relocation handler or the permanent handler. This
* function is therefore called twice -- once for each handler.
* By default the parameters for each SMM handler are:
* stack_size num_concurrent_stacks num_concurrent_save_states
* relo: save_state_size get_cpu_count() 1
* perm: save_state_size get_cpu_count() get_cpu_count()
*/
void (*adjust_smm_params)(struct smm_loader_params *slp, int is_perm);
/*
* Optionally provide a callback prior to the APs starting SMM
* relocation or CPU driver initialization. However, note that
* this callback is called after SMM handlers have been loaded.
*/
void (*pre_mp_smm_init)(void);
/*
* Optional function to use to trigger SMM to perform relocation. If
* not provided, smm_initiate_relocation() is used.
*/
void (*per_cpu_smm_trigger)(void);
/*
* This function is called while each CPU is in the SMM relocation
* handler. Its primary purpose is to adjust the SMBASE for the
* permanent handler. The parameters passed are the current cpu
* running the relocation handler, current SMBASE of relocation handler,
* and the pre-calculated staggered CPU SMBASE address of the permanent
* SMM handler.
*/
void (*relocation_handler)(int cpu, uintptr_t curr_smbase,
uintptr_t staggered_smbase);
/*
* Optionally provide a callback that is called after the APs
* and the BSP have gone through the initialion sequence.
*/
void (*post_mp_init)(void);
};
/*
* mp_init_with_smm() returns < 0 on failure and 0 on success. The mp_ops
* argument is used to drive the multiprocess initialization. Unless otherwise
* stated each callback is called on the BSP only. The sequence of operations
* is the following:
* 1. pre_mp_init()
* 2. get_cpu_count()
* 3. get_smm_info()
* 4. get_microcode_info()
* 5. adjust_cpu_apic_entry() for each number of get_cpu_count()
* 6. adjust_smm_params(is_perm = 0)
* 7. adjust_smm_params(is_perm = 1)
* 8. pre_mp_smm_init()
* 9. per_cpu_smm_trigger() in parallel for all cpus which calls
* relocation_handler() in SMM.
* 10. mp_initialize_cpu() for each cpu
* 11. post_mp_init()
*/
int mp_init_with_smm(struct bus *cpu_bus, const struct mp_ops *mp_ops);
/*
* After APs are up and PARALLEL_MP_AP_WORK is enabled one can issue work
* to all the APs to perform. Currently the BSP is the only CPU that is allowed
* to issue work. i.e. the APs should not call any of these functions.
* All functions return < 0 on error, 0 on success.
*/
int mp_run_on_aps(void (*func)(void), long expire_us);
/* Like mp_run_on_aps() but also runs func on BSP. */
int mp_run_on_all_cpus(void (*func)(void), long expire_us);
/*
* Park all APs to prepare for OS boot. This is handled automatically
* by the coreboot infrastructure.
*/
int mp_park_aps(void);
/*
* SMM helpers to use with initializing CPUs.
*/
/* Send SMI to self without any serialization. */
void smm_initiate_relocation_parallel(void);
/* Send SMI to self with single execution. */
void smm_initiate_relocation(void);
/* Make a CPU wait until the barrier is released */
void barrier_wait(atomic_t *b);
/*
* Make a CPU wait until the barrier is released, or timeout occurs
* returns 1 if timeout occurs before barier is released.
* returns 0 if barrier is released before timeout.
*/
int barrier_wait_timeout(atomic_t *b, uint32_t timeout_ms);
/* Release a barrier so that other CPUs waiting for that barrier can continue */
void release_barrier(atomic_t *b);
#endif /* _X86_MP_H_ */
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