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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 "mem_trap.h"
/*
* Generic call to make accesses to a peripheral trap into the
* HYP mode by invalidating its descriptor in the 2nd stage
* translation tables
*/
unsigned mem_trap_setup(unsigned periph_addr, mem_trap_data * periph_trap_data)
{
unsigned rc = 0x0, four_kb_index = 0;
unsigned one_gb_index = 0, two_mb_index = 0;
unsigned long long vtcr = 0x0, hcr = 0x0, level = 0;
unsigned long long pagetable_base = 0x0, l2_desc = 0;
unsigned long long l3_desc = 0, l3_table = 0;
/* Check if 2nd stage translations are enabled */
hcr = read_hcr();
if (!(hcr & HCR_VM)) {
printf("%s: 2nd Stage translations not enabled \n",
__FUNCTION__);
rc = 0x1;
goto out;
}
/* Check what level of tables we need to start at */
vtcr = read_vtcr();
level = (vtcr >> 6) & 0x3;
/* Read the page table base address. */
pagetable_base = read_vttbr();
/* Calculate the table indices */
one_gb_index = periph_addr >> 30;
/* Each GB contains (1 << 9) or 512 2MBs */
two_mb_index = (periph_addr >> 21) - ((1 << 9) * one_gb_index);
/* Each GB contains (1 << 18) or 262144 4KBs */
four_kb_index = (periph_addr >> 12) - ((1 << 9) * (periph_addr >> 21));
/* For either starting level find out the level 2 desc */
switch (level) {
case 0x1:
{
/* Start from first level */
unsigned long long l1_desc = 0;
unsigned long long l2_table = 0;
l1_desc =
((unsigned long long
*)((unsigned)(&pagetable_base)[0]))[one_gb_index];
if ((l1_desc & 0x3) != TABLE_MAPPING) {
printf("%s: Invalid 1st level desc : 0x%llu \n",
__FUNCTION__, l1_desc);
rc = 0x1;
goto out;
}
l2_table = l1_desc & 0xfffffff000UL;
l2_desc =
((unsigned long long
*)((unsigned)(&l2_table)[0]))[two_mb_index];
break;
}
case 0x0:
{
/* Start from second level */
l2_desc =
((unsigned long long
*)((unsigned)(&pagetable_base)[0]))[two_mb_index];
break;
}
default:
printf("%s: Invalid Pagetable level \n", __FUNCTION__);
rc = 0x1;
}
/* Validate the 2nd level descriptor */
if ((l2_desc & 0x3) != TABLE_MAPPING) {
printf("%s: Invalid 2nd level desc : 0x%llu \n",
__FUNCTION__, l2_desc);
rc = 0x1;
goto out;
}
l3_table = l2_desc & 0xfffffff000UL;
l3_desc =
((unsigned long long *)((unsigned)(&l3_table)[0]))[four_kb_index];
/*
* Validate the 3rd level descriptor. This means that the mapping is
* already invalid and we have not touched it
*/
if ((l3_desc & 0x3) != VALID_MAPPING) {
printf("%s: Invalid 3rd level desc : 0x%llu \n",
__FUNCTION__, l3_desc);
rc = 0x1;
goto out;
}
/* Save the info gathered so far */
periph_trap_data->table = l3_table;
periph_trap_data->index = four_kb_index;
periph_trap_data->prev_desc = l3_desc;
periph_trap_data->cluster_id = read_clusterid();
periph_trap_data->valid = 1;
/* Invalidate the peripheral page table entry */
((unsigned long long *)((unsigned)(&l3_table)[0]))[four_kb_index] = 0x0;
out:
return rc;
}
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