4e095d2e90
Summary: - This commit adds SMP support for BUILD_KERNEL Impact: - RISC-V: BUILD_KERNEL + SMP only Testing: - Tested with rv-virt:ksmp64 (will be added later) Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
166 lines
4.5 KiB
C
166 lines
4.5 KiB
C
/****************************************************************************
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* arch/risc-v/src/common/riscv_cpustart.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <assert.h>
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#include <debug.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <nuttx/arch.h>
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#include <nuttx/spinlock.h>
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#include <nuttx/sched_note.h>
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#include "sched/sched.h"
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#include "init/init.h"
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#include "riscv_internal.h"
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#ifdef CONFIG_BUILD_KERNEL
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# include "riscv_mmu.h"
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#endif
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#include "chip.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: riscv_cpu_boot
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*
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* Description:
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* Boot handler for cpu[x]
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void riscv_cpu_boot(int cpu)
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{
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/* Clear IPI for CPU(cpu) */
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putreg32(0, (uintptr_t)RISCV_IPI + (4 * cpu));
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/* Enable machine software interrupt for IPI to boot */
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up_enable_irq(RISCV_IRQ_SOFT);
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/* Wait interrupt */
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asm("WFI");
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#ifdef CONFIG_BUILD_KERNEL
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/* Initialize the per CPU areas */
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riscv_percpu_add_hart((uintptr_t)cpu);
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/* Enable MMU */
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binfo("mmu_enable: satp=%lx\n", g_kernel_pgt_pbase);
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mmu_enable(g_kernel_pgt_pbase, 0);
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#endif
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_info("CPU%d Started\n", this_cpu());
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#ifdef CONFIG_STACK_COLORATION
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struct tcb_s *tcb = this_task();
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/* If stack debug is enabled, then fill the stack with a
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* recognizable value that we can use later to test for high
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* water marks.
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*/
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riscv_stack_color(tcb->stack_alloc_ptr, 0);
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#endif
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/* TODO: Setup FPU */
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/* Clear machine software interrupt for CPU(cpu) */
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putreg32(0, (uintptr_t)RISCV_IPI + (4 * cpu));
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#ifdef CONFIG_SCHED_INSTRUMENTATION
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/* Notify that this CPU has started */
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sched_note_cpu_started(this_task());
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#endif
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up_irq_enable();
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/* Then transfer control to the IDLE task */
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nx_idle_trampoline();
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}
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/****************************************************************************
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* Name: up_cpu_start
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*
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* Description:
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* In an SMP configuration, only one CPU is initially active (CPU 0).
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* System initialization occurs on that single thread. At the completion of
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* the initialization of the OS, just before beginning normal multitasking,
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* the additional CPUs would be started by calling this function.
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*
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* Each CPU is provided the entry point to its IDLE task when started. A
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* TCB for each CPU's IDLE task has been initialized and placed in the
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* CPU's g_assignedtasks[cpu] list. No stack has been allocated or
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* initialized.
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*
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* The OS initialization logic calls this function repeatedly until each
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* CPU has been started, 1 through (CONFIG_SMP_NCPUS-1).
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*
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* Input Parameters:
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* cpu - The index of the CPU being started. This will be a numeric
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* value in the range of one to (CONFIG_SMP_NCPUS-1).
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* (CPU 0 is already active)
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*
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* Returned Value:
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* Zero on success; a negated errno value on failure.
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*
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****************************************************************************/
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int up_cpu_start(int cpu)
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{
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_info("CPU=%d\n", cpu);
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#ifdef CONFIG_SCHED_INSTRUMENTATION
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/* Notify of the start event */
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sched_note_cpu_start(this_task(), cpu);
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#endif
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/* Send IPI to CPU(cpu) */
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putreg32(1, (uintptr_t)RISCV_IPI + (cpu * 4));
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return 0;
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}
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