6513d20744
- RTS_VMINHIBIT flag is used to stop process while VM is fiddling with its pagetables - more generic way of sending synchronous scheduling events among cpus - do the x-cpu smp sched calls only if the target process is runnable. If it is not, it cannot be running and it cannot become runnable this CPU holds the BKL
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
#ifndef __SMP_H__
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#define __SMP_H__
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#ifdef CONFIG_SMP
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#ifndef __ASSEMBLY__
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#include "kernel.h"
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#include "arch_smp.h"
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#include "spinlock.h"
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/* number of CPUs (execution strands in the system */
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EXTERN unsigned ncpus;
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/* Number of virtual strands per physical core */
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EXTERN unsigned ht_per_core;
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/* which cpu is bootstraping */
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EXTERN unsigned bsp_cpu_id;
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#define cpu_is_bsp(cpu) (bsp_cpu_id == cpu)
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/*
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* SMP initialization is largely architecture dependent and each architecture
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* must provide a method how to do it. If initiating SMP fails the function does
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* not report it. However it must put the system in such a state that it falls
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* back to a uniprocessor system. Although the uniprocessor configuration may be
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* suboptimal, the system must be able to run on the bootstrap processor as if
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* it was the only processor in the system
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*/
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_PROTOTYPE(void smp_init, (void));
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#define CPU_IS_BSP 1
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#define CPU_IS_READY 2
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struct cpu {
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u32_t flags;
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};
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EXTERN struct cpu cpus[CONFIG_MAX_CPUS];
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#define cpu_set_flag(cpu, flag) do { cpus[cpu].flags |= (flag); } while(0)
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#define cpu_clear_flag(cpu, flag) do { cpus[cpu].flags &= ~(flag); } while(0)
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#define cpu_test_flag(cpu, flag) (cpus[cpu].flags & (flag))
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#define cpu_is_ready(cpu) cpu_test_flag(cpu, CPU_IS_READY)
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/*
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* Big Kernel Lock prevents more then one cpu executing the kernel code
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*/
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SPINLOCK_DECLARE(big_kernel_lock)
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/*
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* to sync the booting APs
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*/
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SPINLOCK_DECLARE(boot_lock)
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_PROTOTYPE(void wait_for_APs_to_finish_booting, (void));
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_PROTOTYPE(void ap_boot_finished, (unsigned cpu));
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/* IPI handlers */
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_PROTOTYPE(void smp_ipi_halt_handler, (void));
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_PROTOTYPE(void smp_ipi_sched_handler, (void));
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_PROTOTYPE(void smp_schedule, (unsigned cpu));
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/* stop a processes on a different cpu */
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_PROTOTYPE(void smp_schedule_stop_proc, (struct proc * p));
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/* stop a process on a different cpu because its adress space is being changed */
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_PROTOTYPE(void smp_schedule_vminhibit, (struct proc * p));
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_PROTOTYPE(void arch_send_smp_schedule_ipi, (unsigned cpu));
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_PROTOTYPE(void arch_smp_halt_cpu, (void));
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_SMP */
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#endif /* __SMP_H__ */
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