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/* -*-  Mode:C; c-basic-offset:4; tab-width:4; indent-tabs-mode:nil -*- */
/*
 * vmx_process.c: handling VMX architecture-related VM exits
 * Copyright (c) 2005, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 *  Xiaoyan Feng (Fleming Feng)  <fleming.feng@intel.com>
 *  Xuefei Xu (Anthony Xu) (Anthony.xu@intel.com)
 */

#include <xen/config.h>
#include <xen/lib.h>
#include <xen/errno.h>
#include <xen/sched.h>
#include <xen/smp.h>
#include <asm/ptrace.h>
#include <xen/delay.h>

#include <linux/efi.h>  /* FOR EFI_UNIMPLEMENTED */
#include <asm/sal.h>    /* FOR struct ia64_sal_retval */

#include <asm/system.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/desc.h>
#include <asm/vlsapic.h>
#include <xen/irq.h>
#include <xen/event.h>
#include <asm/regionreg.h>
#include <asm/privop.h>
#include <asm/ia64_int.h>
#include <asm/debugger.h>
//#include <asm/hpsim_ssc.h>
#include <asm/dom_fw.h>
#include <asm/vmx_vcpu.h>
#include <asm/kregs.h>
#include <asm/vmx.h>
#include <asm/vmmu.h>
#include <asm/vmx_mm_def.h>
#include <asm/vmx_phy_mode.h>
#include <xen/mm.h>
#include <asm/vmx_pal.h>
/* reset all PSR field to 0, except up,mfl,mfh,pk,dt,rt,mc,it */
#define INITIAL_PSR_VALUE_AT_INTERRUPTION 0x0000001808028034


extern void die_if_kernel(char *str, struct pt_regs *regs, long err);
extern void rnat_consumption (VCPU *vcpu);
extern void alt_itlb (VCPU *vcpu, u64 vadr);
extern void itlb_fault (VCPU *vcpu, u64 vadr);
extern void ivhpt_fault (VCPU *vcpu, u64 vadr);
extern unsigned long handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr);

#define DOMN_PAL_REQUEST    0x110000
#define DOMN_SAL_REQUEST    0x110001

static u64 vec2off[68] = {0x0,0x400,0x800,0xc00,0x1000,0x1400,0x1800,
    0x1c00,0x2000,0x2400,0x2800,0x2c00,0x3000,0x3400,0x3800,0x3c00,0x4000,
    0x4400,0x4800,0x4c00,0x5000,0x5100,0x5200,0x5300,0x5400,0x5500,0x5600,
    0x5700,0x5800,0x5900,0x5a00,0x5b00,0x5c00,0x5d00,0x5e00,0x5f00,0x6000,
    0x6100,0x6200,0x6300,0x6400,0x6500,0x6600,0x6700,0x6800,0x6900,0x6a00,
    0x6b00,0x6c00,0x6d00,0x6e00,0x6f00,0x7000,0x7100,0x7200,0x7300,0x7400,
    0x7500,0x7600,0x7700,0x7800,0x7900,0x7a00,0x7b00,0x7c00,0x7d00,0x7e00,
    0x7f00
};



void vmx_reflect_interruption(u64 ifa, u64 isr, u64 iim,
                              u64 vector, REGS *regs)
{
    u64 status;
    VCPU *vcpu = current;
    u64 vpsr = VCPU(vcpu, vpsr);
    vector=vec2off[vector];
    if(!(vpsr&IA64_PSR_IC)&&(vector!=IA64_DATA_NESTED_TLB_VECTOR)){
        panic_domain(regs, "Guest nested fault vector=%lx!\n", vector);
    }
    else{ // handle fpswa emulation
        // fp fault
        if (vector == IA64_FP_FAULT_VECTOR) {
            status = handle_fpu_swa(1, regs, isr);
            if (!status) {
                vcpu_increment_iip(vcpu);
                return;
            } else if (IA64_RETRY == status)
                return;
        }
        //fp trap
        else if (vector == IA64_FP_TRAP_VECTOR) {
            status = handle_fpu_swa(0, regs, isr);
            if (!status)
                return;
            else if (IA64_RETRY == status) {
                vcpu_decrement_iip(vcpu);
                return;
            }
        }
    }
    VCPU(vcpu,isr)=isr;
    VCPU(vcpu,iipa) = regs->cr_iip;
    if (vector == IA64_BREAK_VECTOR || vector == IA64_SPECULATION_VECTOR)
        VCPU(vcpu,iim) = iim;
    else {
        set_ifa_itir_iha(vcpu,ifa,1,1,1);
    }
    inject_guest_interruption(vcpu, vector);
}


IA64FAULT
vmx_ia64_handle_break (unsigned long ifa, struct pt_regs *regs, unsigned long isr, unsigned long iim)
{
    struct domain *d = current->domain;
    struct vcpu *v = current;

    perfc_incrc(vmx_ia64_handle_break);
#ifdef CRASH_DEBUG
    if ((iim == 0 || iim == CDB_BREAK_NUM) && !user_mode(regs) &&
        IS_VMM_ADDRESS(regs->cr_iip)) {
        if (iim == 0)
            show_registers(regs);
        debugger_trap_fatal(0 /* don't care */, regs);
    } else
#endif
    {
        if (iim == 0) 
            vmx_die_if_kernel("Break 0 in Hypervisor.", regs, iim);

        if (!user_mode(regs)) {
            /* Allow hypercalls only when cpl = 0.  */
            if (iim == d->arch.breakimm) {
                ia64_hypercall(regs);
                vcpu_increment_iip(v);
                return IA64_NO_FAULT;
            }
            else if(iim == DOMN_PAL_REQUEST){
                pal_emul(v);
                vcpu_increment_iip(v);
                return IA64_NO_FAULT;
            }else if(iim == DOMN_SAL_REQUEST){
                sal_emul(v);
                vcpu_increment_iip(v);
                return IA64_NO_FAULT;
            }
        }
        vmx_reflect_interruption(ifa,isr,iim,11,regs);
    }
    return IA64_NO_FAULT;
}


void save_banked_regs_to_vpd(VCPU *v, REGS *regs)
{
    unsigned long i=0UL, * src,* dst, *sunat, *dunat;
    IA64_PSR vpsr;
    src=&regs->r16;
    sunat=&regs->eml_unat;
    vpsr.val = VCPU(v, vpsr);
    if(vpsr.bn){
        dst = &VCPU(v, vgr[0]);
        dunat =&VCPU(v, vnat);
        __asm__ __volatile__ (";;extr.u %0 = %1,%4,16;; \
                            dep %2 = %0, %2, 0, 16;; \
                            st8 [%3] = %2;;"
       ::"r"(i),"r"(*sunat),"r"(*dunat),"r"(dunat),"i"(IA64_PT_REGS_R16_SLOT):"memory");

    }else{
        dst = &VCPU(v, vbgr[0]);
//        dunat =&VCPU(v, vbnat);
//        __asm__ __volatile__ (";;extr.u %0 = %1,%4,16;;
//                            dep %2 = %0, %2, 16, 16;;
//                            st8 [%3] = %2;;"
//       ::"r"(i),"r"(*sunat),"r"(*dunat),"r"(dunat),"i"(IA64_PT_REGS_R16_SLOT):"memory");

    }
    for(i=0; i<16; i++)
        *dst++ = *src++;
}


// ONLY gets called from ia64_leave_kernel
// ONLY call with interrupts disabled?? (else might miss one?)
// NEVER successful if already reflecting a trap/fault because psr.i==0
void leave_hypervisor_tail(struct pt_regs *regs)


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