LXR linux/arch/ia64/xen/hypervisor.c

   1/******************************************************************************
   2 * arch/ia64/xen/hypervisor.c
   3 *
   4 * Copyright (c) 2006 Isaku Yamahata <yamahata at valinux co jp>
   5 *                    VA Linux Systems Japan K.K.
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20 *
  21 */
  22
  23#include <linux/efi.h>
  24#include <linux/export.h>
  25#include <asm/xen/hypervisor.h>
  26#include <asm/xen/privop.h>
  27
  28#include "irq_xen.h"
  29
  30struct shared_info *HYPERVISOR_shared_info __read_mostly =
  31        (struct shared_info *)XSI_BASE;
  32EXPORT_SYMBOL(HYPERVISOR_shared_info);
  33
  34DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
  35
  36struct start_info *xen_start_info;
  37EXPORT_SYMBOL(xen_start_info);
  38
  39EXPORT_SYMBOL(xen_domain_type);
  40
  41EXPORT_SYMBOL(__hypercall);
  42
  43/* Stolen from arch/x86/xen/enlighten.c */
  44/*
  45 * Flag to determine whether vcpu info placement is available on all
  46 * VCPUs.  We assume it is to start with, and then set it to zero on
  47 * the first failure.  This is because it can succeed on some VCPUs
  48 * and not others, since it can involve hypervisor memory allocation,
  49 * or because the guest failed to guarantee all the appropriate
  50 * constraints on all VCPUs (ie buffer can't cross a page boundary).
  51 *
  52 * Note that any particular CPU may be using a placed vcpu structure,
  53 * but we can only optimise if the all are.
  54 *
  55 * 0: not available, 1: available
  56 */
  57
  58static void __init xen_vcpu_setup(int cpu)
  59{
  60        /*
  61         * WARNING:
  62         * before changing MAX_VIRT_CPUS,
  63         * check that shared_info fits on a page
  64         */
  65        BUILD_BUG_ON(sizeof(struct shared_info) > PAGE_SIZE);
  66        per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
  67}
  68
  69void __init xen_setup_vcpu_info_placement(void)
  70{
  71        int cpu;
  72
  73        for_each_possible_cpu(cpu)
  74                xen_vcpu_setup(cpu);
  75}
  76
  77void
  78xen_cpu_init(void)
  79{
  80        xen_smp_intr_init();
  81}
  82
  83/**************************************************************************
  84 * opt feature
  85 */
  86void
  87xen_ia64_enable_opt_feature(void)
  88{
  89        /* Enable region 7 identity map optimizations in Xen */
  90        struct xen_ia64_opt_feature optf;
  91
  92        optf.cmd = XEN_IA64_OPTF_IDENT_MAP_REG7;
  93        optf.on = XEN_IA64_OPTF_ON;
  94        optf.pgprot = pgprot_val(PAGE_KERNEL);
  95        optf.key = 0;   /* No key on linux. */
  96        HYPERVISOR_opt_feature(&optf);
  97}
  98