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Diffstat (limited to 'src/include/cpu')
| -rw-r--r-- | src/include/cpu/x86/mp.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/include/cpu/x86/mp.h b/src/include/cpu/x86/mp.h new file mode 100644 index 0000000000..5112848e94 --- /dev/null +++ b/src/include/cpu/x86/mp.h @@ -0,0 +1,120 @@ +/* + * 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. + * + * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef _X86_MP_H_ +#define _X86_MP_H_ + +#include <arch/smp/atomic.h> + +#define CACHELINE_SIZE 64 + +struct cpu_info; +struct bus; + +static inline void mfence(void) +{ + __asm__ __volatile__("mfence\t\n": : :"memory"); +} + +typedef void (*mp_callback_t)(void *arg); + +/* + * A mp_flight_record details a sequence of calls for the APs to perform + * along with the BSP to coordinate sequencing. Each flight record either + * provides a barrier for each AP before calling the callback or the APs + * are allowed to perform the callback without waiting. Regardless, each + * record has the cpus_entered field incremented for each record. When + * the BSP observes that the cpus_entered matches the number of APs + * the bsp_call is called with bsp_arg and upon returning releases the + * barrier allowing the APs to make further progress. + * + * Note that ap_call() and bsp_call() can be NULL. In the NULL case the + * callback will just not be called. + */ +struct mp_flight_record { + atomic_t barrier; + atomic_t cpus_entered; + mp_callback_t ap_call; + void *ap_arg; + mp_callback_t bsp_call; + void *bsp_arg; +} __attribute__((aligned(CACHELINE_SIZE))); + +#define _MP_FLIGHT_RECORD(barrier_, ap_func_, ap_arg_, bsp_func_, bsp_arg_) \ + { \ + .barrier = ATOMIC_INIT(barrier_), \ + .cpus_entered = ATOMIC_INIT(0), \ + .ap_call = ap_func_, \ + .ap_arg = ap_arg_, \ + .bsp_call = bsp_func_, \ + .bsp_arg = bsp_arg_, \ + } + +#define MP_FR_BLOCK_APS(ap_func_, ap_arg_, bsp_func_, bsp_arg_) \ + _MP_FLIGHT_RECORD(0, ap_func_, ap_arg_, bsp_func_, bsp_arg_) + +#define MP_FR_NOBLOCK_APS(ap_func_, ap_arg_, bsp_func_, bsp_arg_) \ + _MP_FLIGHT_RECORD(1, ap_func_, ap_arg_, bsp_func_, bsp_arg_) + +/* The mp_params structure provides the arguments to the mp subsystem + * for bringing up APs. */ +struct mp_params { + int num_cpus; /* Total cpus include BSP */ + int parallel_microcode_load; + const void *microcode_pointer; + /* adjust_apic_id() is called for every potential apic id in the + * system up from 0 to CONFIG_MAX_CPUS. Return adjusted apic_id. */ + int (*adjust_apic_id)(int index, int apic_id); + /* Flight plan for APs and BSP. */ + struct mp_flight_record *flight_plan; + int num_records; +}; + +/* + * mp_init() will set up the SIPI vector and bring up the APs according to + * mp_params. Each flight record will be executed according to the plan. Note + * that the MP infrastructure uses SMM default area without saving it. It's + * up to the chipset or mainboard to either e820 reserve this area or save this + * region prior to calling mp_init() and restoring it after mp_init returns. + * + * At the time mp_init() is called the MTRR MSRs are mirrored into APs then + * caching is enabled before running the flight plan. + * + * The MP initialization has the following properties: + * 1. APs are brought up in parallel. + * 2. The ordering of coreboot cpu number and APIC ids is not deterministic. + * Therefore, one cannot rely on this property or the order of devices in + * the device tree unless the chipset or mainboard know the APIC ids + * a priori. + * + * mp_init() returns < 0 on error, 0 on success. + */ +int mp_init(struct bus *cpu_bus, struct mp_params *params); + +/* + * Useful functions to use in flight records when sequencing APs. + */ + +/* Calls cpu_initialize(info->index) which calls the coreboot CPU drivers. */ +void mp_initialize_cpu(void *unused); + +/* Returns apic id for coreboot cpu number or < 0 on failure. */ +int mp_get_apic_id(int cpu_slot); + +#endif /* _X86_MP_H_ */ |