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path: root/big-little/virtualisor/virt_context.c
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/*
 * Copyright (c) 2012, ARM Limited. All rights reserved.
 *       
 * Redistribution and use in source and binary forms, with
 * or without modification, are permitted provided that the
 * following conditions are met:
 *     
 * Redistributions of source code must retain the above
 * copyright notice, this list of conditions and the 
 * following disclaimer.
 *
 * Redistributions in binary form must reproduce the
 * above copyright notice, this list of conditions and 
 * the following disclaimer in the documentation 
 * and/or other materials provided with the distribution.
 *      
 * Neither the name of ARM nor the names of its
 * contributors may be used to endorse or promote products
 * derived from this software without specific prior written
 * permission.                        
 */ 

#include "virtualisor.h"
#include "misc.h"
#include "virt_helpers.h"
#include "cache_geom.h"
#include "mem_trap.h"
extern virt_reg_data host_virt_regs[];
extern reg_trap_data host_trap_regs[];
extern unsigned cmop_debug;
extern cache_stats cm_op_stats[NUM_CPUS][MAX_CACHE_LEVELS];

/*
 * Save/Restore of Virtualisor should be done only on the host cpu
 * & host cluster unlike setup which is done on both. The cluster
 * is need for cases where both clusters have same cpu type and one 
 * cluster does not use the Virtualisor.
 */
void SaveVirtualisor(unsigned first_cpu)
{
        unsigned len = 0, ctr = 0, cpu_id = read_cpuid(), cpu_no = PART_NO(read_midr());
        unsigned cluster_id = read_clusterid(), index = 0, vd_len = 0, rc = 0;
        mem_trap_data *s2_td = &s2_trap_section$$Base;
        unsigned long long *cd_ptr = 0x0;
        unsigned *periph_addr = 0x0;
        virt_descriptor *vd_array = &virt_desc_section$$Base;
        unsigned (*handler) (unsigned, unsigned) = 0x0, sibling;

        /* Find our brother from another mother */
        sibling = find_sibling_cpu();

        if (cluster_id == host_cluster) {       
                /*
                 * Since there is only one second stage translation table, its 
                 * safe to assume that only one cpu (first_cpu) should save &
                 * restore the context.
                 */
                len = (unsigned)&s2_trap_section$$Length;
                if (cpu_id == first_cpu) {
                        /* Iterate through the array of 2nd stage translation traps */
                        for (ctr = 0; ctr < (len / sizeof(mem_trap_data)); ctr++) {
                                if (s2_td[ctr].valid
                                    && s2_td[ctr].cluster_id == cluster_id) {
                                        
                                        /* 
                                         * Save the current descriptor and restore the
                                         * previous. Need not worry about synchronisation
                                         * issues, as the existing entry was causing
                                         * translation faults. The TLB never caches fault
                                         * generating translations.
                                         */
                                        cd_ptr =
                                                &((unsigned long long
                                                   *)((unsigned)(&s2_td[ctr].
                                                                 table)[0]))[s2_td[ctr].
                                                                             index];
                                        s2_td[ctr].cur_desc = *cd_ptr;
                                        *cd_ptr = s2_td[ctr].prev_desc;
                                        periph_addr = (unsigned *) cd_ptr;
                                        dsb();
                                        inv_tlb_mva((unsigned *) periph_addr[0]);
                                        inv_bpred_all();
                                }
                        }
                }
                
                /* Save the HYP trap registers for this cpu */
                host_trap_regs[cpu_id].hcr = read_hcr();
                host_trap_regs[cpu_id].hdcr = read_hdcr();
                host_trap_regs[cpu_id].hcptr = read_hcptr();
                host_trap_regs[cpu_id].hstr = read_hstr();
                
                if(cmop_debug) {
                        /* Print Cache maintenance statistics */
                        for (ctr = 0; ctr < MAX_CACHE_LEVELS; ctr++) {
                                printf("Cache Level %d", ctr);
                                printf(" : Partial ops=0x%x",
                                       cm_op_stats[cpu_id][ctr].part_cmop_cnt);
                                printf(" : Complete ops=0x%x", 
                                       cm_op_stats[cpu_id][ctr].cmpl_cmop_cnt);
                                printf("\n");
                        }
                }
                
        }

        /* 
         * Call any cpu specific save routines (if any)
         */
        vd_len = (unsigned)&virt_desc_section$$Length;
        for (index = 0; index < (vd_len / sizeof(virt_descriptor)); index++) {

                if (cpu_no == vd_array[index].cpu_no) {
                        handler = vd_array[index].trap_save;
                        if(handler) {
                                rc = handler(first_cpu, sibling);
                                if (rc) {
                                        printf("%s: failed on cpu%d \n",
                                               __FUNCTION__,
                                               cpu_no);
                                        goto out;
                                }
                        }
                }
        }

 out:
        if (rc) {
                printf("%s: Failed : Cpu%d : Host=0x%x : Target=0x%x\n ", 
                       __FUNCTION__, cpu_id, cpu_no, sibling);
                panic();
        }

        return;
}

/*
 * TODO: not required as we can invoke the cpu restore function
 * directly from SetupVirtualisor and don't need to go through
 * the descriptor array again.
 */
void RestoreVirtualisor(unsigned first_cpu)
{
        unsigned len = 0, ctr = 0, cpu_id = read_cpuid(), cpu_no = PART_NO(read_midr());
        unsigned cluster_id = read_clusterid(), index = 0, vd_len = 0, rc = 0;
        mem_trap_data *s2_td = &s2_trap_section$$Base;
        unsigned long long *cd_ptr = 0x0;
        unsigned *periph_addr = 0x0;
        virt_descriptor *vd_array = &virt_desc_section$$Base;
        unsigned (*handler) (unsigned, unsigned) = 0x0, sibling;

        /* Find our brother from another mother */
        sibling = find_sibling_cpu();

        if (cluster_id == host_cluster) {
                /*
                 * Since there is only one second stage translation table, its 
                 * safe to assume that only one cpu (first_cpu) should save &
                 * restore the context.
                 */
                len = (unsigned)&s2_trap_section$$Length;
                if (cpu_id == first_cpu) {
                        /* Iterate through the array of 2nd stage translation traps */
                        for (ctr = 0; ctr < (len / sizeof(mem_trap_data)); ctr++) {
                                if (s2_td[ctr].valid
                                    && s2_td[ctr].cluster_id == cluster_id) {
                                        /* 
                                         * Restore the current descriptor and save the previous 
                                         */
                                        cd_ptr =
                                                &((unsigned long long
                                                   *)((unsigned)((&s2_td[ctr].
                                                                  table)[0])))[s2_td[ctr].
                                                                               index];
                                        s2_td[ctr].prev_desc = *cd_ptr;
                                        *cd_ptr = s2_td[ctr].cur_desc;
                                        periph_addr = (unsigned *) cd_ptr;
                                        dsb();
                                        inv_tlb_mva((unsigned *) periph_addr[0]);
                                        inv_bpred_all();
                                }
                        }
                }
                
                /* Now restore the virtualised ID registers for this cpu */
                write_vmidr(host_virt_regs[cpu_id].midr);
                write_vmpidr(host_virt_regs[cpu_id].mpidr);
                
                /* Restore the HYP trap registers for this cpu */
                write_hcr(host_trap_regs[cpu_id].hcr);
                write_hdcr(host_trap_regs[cpu_id].hdcr);
                write_hcptr(host_trap_regs[cpu_id].hcptr);
                write_hstr(host_trap_regs[cpu_id].hstr);
                
                if(cmop_debug) {
                        /* Resetting Cache maintenance statistics */
                        for (ctr = 0; ctr < MAX_CACHE_LEVELS; ctr++) {
                                cm_op_stats[cpu_id][ctr].part_cmop_cnt = 0;
                                cm_op_stats[cpu_id][ctr].cmpl_cmop_cnt = 0;
                        }
                }
        }

        /* 
         * Call any cpu specific restore routines (if any)
         */
        vd_len = (unsigned)&virt_desc_section$$Length;
        for (index = 0; index < (vd_len / sizeof(virt_descriptor)); index++) {

                if (cpu_no == vd_array[index].cpu_no) {
                        handler = vd_array[index].trap_restore;
                        if(handler) {
                                rc = handler(first_cpu, sibling);
                                if (rc) {
                                        printf("%s: failed on cpu%d \n",
                                               __FUNCTION__,
                                               cpu_no);
                                        goto out;
                                }
                        }
                }
        }       

 out:
        if (rc) {
                printf("%s: Failed : Cpu%d : Host=0x%x : Target=0x%x\n ", 
                       __FUNCTION__, cpu_id, cpu_no, sibling);
                panic();
        }

        return;
}