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Andrew Cooper
9b7d793889
Now that we're using hypercalls to start APs, we can replace the 'ap_cpuid' global with a regular function parameter. This requires telling the compiler that we'd like the parameter in a register rather than on the stack. While adjusting, rename to cpu_setup(). It's always been used on the BSP, making the name ap_start() specifically misleading. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Alejandro Vallejo <alejandro.vallejo@cloud.com>
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
/*
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* smp.c: Secondary processor bringup and initialisation.
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*
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* Copyright (c) 2008, Citrix Systems, Inc.
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*
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* Authors:
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* Keir Fraser <keir@xen.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "util.h"
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#include "config.h"
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#include "apic_regs.h"
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#include "hypercall.h"
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#include <xen/asm/x86-defns.h>
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#include <xen/hvm/hvm_vcpu.h>
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#include <xen/vcpu.h>
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static int ap_callin;
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static void __attribute__((regparm(1))) cpu_setup(unsigned int cpu)
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{
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printf(" - CPU%d ... ", cpu);
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cacheattr_init();
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printf("done.\n");
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if ( !cpu ) /* Used on the BSP too */
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return;
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wmb();
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ap_callin = 1;
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/* After this point, the BSP will shut us down. */
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for ( ;; )
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asm volatile ( "hlt" );
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}
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static void boot_cpu(unsigned int cpu)
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{
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static uint8_t ap_stack[PAGE_SIZE] __attribute__ ((aligned (16)));
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static struct vcpu_hvm_context ap;
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/* Initialise shared variables. */
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ap_callin = 0;
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wmb();
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/* Wake up the secondary processor */
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ap = (struct vcpu_hvm_context) {
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.mode = VCPU_HVM_MODE_32B,
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.cpu_regs.x86_32 = {
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.eip = (unsigned long)cpu_setup,
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.esp = (unsigned long)ap_stack + ARRAY_SIZE(ap_stack),
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.eax = cpu,
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/* Protected Mode, no paging. */
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.cr0 = X86_CR0_PE,
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/* 32bit Flat Mode */
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.cs_limit = -1U,
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.ds_limit = -1U,
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.ss_limit = -1U,
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.es_limit = -1U,
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.tr_limit = 0x67,
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.cs_ar = 0xc9b,
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.ds_ar = 0xc93,
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.es_ar = 0xc93,
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.ss_ar = 0xc93,
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.tr_ar = 0x8b,
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},
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};
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if ( hypercall_vcpu_op(VCPUOP_initialise, cpu, &ap) )
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BUG();
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if ( hypercall_vcpu_op(VCPUOP_up, cpu, NULL) )
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BUG();
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/*
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* Wait for the secondary processor to complete initialisation.
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* Do not touch shared resources meanwhile.
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*/
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while ( !ap_callin )
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cpu_relax();
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/* Take the secondary processor offline. */
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if ( hypercall_vcpu_op(VCPUOP_down, cpu, NULL) )
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BUG();
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}
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void smp_initialise(void)
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{
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unsigned int i, nr_cpus = hvm_info->nr_vcpus;
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printf("Multiprocessor initialisation:\n");
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cpu_setup(0);
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for ( i = 1; i < nr_cpus; i++ )
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boot_cpu(i);
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}
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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