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/*
* Copyright (c) 2014-2015, ARM Limited and Contributors. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <assert.h>
#include <debug.h>
#include <mmio.h>
#include <stddef.h>
#include <tzc400.h>
/*
* Implementation defined values used to validate inputs later.
* Filters : max of 4 ; 0 to 3
* Regions : max of 9 ; 0 to 8
* Address width : Values between 32 to 64
*/
typedef struct tzc_instance {
uintptr_t base;
uint8_t addr_width;
uint8_t num_filters;
uint8_t num_regions;
} tzc_instance_t;
tzc_instance_t tzc;
static inline uint32_t tzc_read_build_config(uintptr_t base)
{
return mmio_read_32(base + BUILD_CONFIG_OFF);
}
static inline uint32_t tzc_read_gate_keeper(uintptr_t base)
{
return mmio_read_32(base + GATE_KEEPER_OFF);
}
static inline void tzc_write_gate_keeper(uintptr_t base, uint32_t val)
{
mmio_write_32(base + GATE_KEEPER_OFF, val);
}
static inline void tzc_write_action(uintptr_t base, tzc_action_t action)
{
mmio_write_32(base + ACTION_OFF, action);
}
static inline void tzc_write_region_base_low(uintptr_t base,
uint32_t region,
uint32_t val)
{
mmio_write_32(base + REGION_BASE_LOW_OFF +
REGION_NUM_OFF(region), val);
}
static inline void tzc_write_region_base_high(uintptr_t base,
uint32_t region,
uint32_t val)
{
mmio_write_32(base + REGION_BASE_HIGH_OFF +
REGION_NUM_OFF(region), val);
}
static inline void tzc_write_region_top_low(uintptr_t base,
uint32_t region,
uint32_t val)
{
mmio_write_32(base + REGION_TOP_LOW_OFF +
REGION_NUM_OFF(region), val);
}
static inline void tzc_write_region_top_high(uintptr_t base,
uint32_t region,
uint32_t val)
{
mmio_write_32(base + REGION_TOP_HIGH_OFF +
REGION_NUM_OFF(region), val);
}
static inline void tzc_write_region_attributes(uintptr_t base,
uint32_t region,
uint32_t val)
{
mmio_write_32(base + REGION_ATTRIBUTES_OFF +
REGION_NUM_OFF(region), val);
}
static inline void tzc_write_region_id_access(uintptr_t base,
uint32_t region,
uint32_t val)
{
mmio_write_32(base + REGION_ID_ACCESS_OFF +
REGION_NUM_OFF(region), val);
}
static uint32_t tzc_read_component_id(uintptr_t base)
{
uint32_t id;
id = mmio_read_8(base + CID0_OFF);
id |= (mmio_read_8(base + CID1_OFF) << 8);
id |= (mmio_read_8(base + CID2_OFF) << 16);
id |= (mmio_read_8(base + CID3_OFF) << 24);
return id;
}
static uint32_t tzc_get_gate_keeper(uintptr_t base, uint8_t filter)
{
uint32_t tmp;
tmp = (tzc_read_gate_keeper(base) >> GATE_KEEPER_OS_SHIFT) &
GATE_KEEPER_OS_MASK;
return (tmp >> filter) & GATE_KEEPER_FILTER_MASK;
}
/* This function is not MP safe. */
static void tzc_set_gate_keeper(uintptr_t base, uint8_t filter, uint32_t val)
{
uint32_t tmp;
/* Upper half is current state. Lower half is requested state. */
tmp = (tzc_read_gate_keeper(base) >> GATE_KEEPER_OS_SHIFT) &
GATE_KEEPER_OS_MASK;
if (val)
tmp |= (1 << filter);
else
tmp &= ~(1 << filter);
tzc_write_gate_keeper(base, (tmp & GATE_KEEPER_OR_MASK) <<
GATE_KEEPER_OR_SHIFT);
/* Wait here until we see the change reflected in the TZC status. */
while (((tzc_read_gate_keeper(base) >> GATE_KEEPER_OS_SHIFT) &
GATE_KEEPER_OS_MASK) != tmp)
;
}
void tzc_init(uintptr_t base)
{
uint32_t tzc_id, tzc_build;
assert(base);
tzc.base = base;
/*
* We expect to see a tzc400. Check component ID. The TZC-400 TRM shows
* component ID is expected to be "0xB105F00D".
*/
tzc_id = tzc_read_component_id(tzc.base);
if (tzc_id != TZC400_COMPONENT_ID) {
ERROR("TZC : Wrong device ID (0x%x).\n", tzc_id);
panic();
}
/* Save values we will use later. */
tzc_build = tzc_read_build_config(tzc.base);
tzc.num_filters = ((tzc_build >> BUILD_CONFIG_NF_SHIFT) &
BUILD_CONFIG_NF_MASK) + 1;
tzc.addr_width = ((tzc_build >> BUILD_CONFIG_AW_SHIFT) &
BUILD_CONFIG_AW_MASK) + 1;
tzc.num_regions = ((tzc_build >> BUILD_CONFIG_NR_SHIFT) &
BUILD_CONFIG_NR_MASK) + 1;
}
/*
* `tzc_configure_region0` is used to program region 0 into the TrustZone
* controller. Region 0 covers the whole address space that is not mapped
* to any other region, and is enabled on all filters; this cannot be
* changed. This function only changes the access permissions.
*/
void tzc_configure_region0(tzc_region_attributes_t sec_attr,
uint32_t ns_device_access)
{
assert(tzc.base);
VERBOSE("TZC : Configuring region 0 (sec_attr=0x%x, ns_devs=0x%x)\n",
sec_attr, ns_device_access);
assert(sec_attr <= TZC_REGION_S_RDWR);
/* Set secure attributes on region 0 */
tzc_write_region_attributes(tzc.base, 0,
sec_attr << REG_ATTR_SEC_SHIFT);
/*
* Specify which non-secure devices have permission to access
* region 0.
*/
tzc_write_region_id_access(tzc.base, 0, ns_device_access);
}
/*
* `tzc_configure_region` is used to program regions into the TrustZone
* controller. A region can be associated with more than one filter. The
* associated filters are passed in as a bitmap (bit0 = filter0).
* NOTE:
* Region 0 is special; it is preferable to use tzc_configure_region0
* for this region (see comment for that function).
*/
void tzc_configure_region(uint32_t filters,
uint8_t region,
uint64_t region_base,
uint64_t region_top,
tzc_region_attributes_t sec_attr,
uint32_t ns_device_access)
{
assert(tzc.base);
VERBOSE("TZC : Configuring region (filters=0x%x, region=%d, ...\n",
filters, region);
VERBOSE("TZC : ... base=0x%lx, top=0x%lx, ...\n",
region_base, region_top);
VERBOSE("TZC : ... sec_attr=0x%x, ns_devs=0x%x)\n",
sec_attr, ns_device_access);
/* Do range checks on filters and regions. */
assert(((filters >> tzc.num_filters) == 0) &&
(region < tzc.num_regions));
/*
* Do address range check based on TZC configuration. A 64bit address is
* the max and expected case.
*/
assert(((region_top <= (UINT64_MAX >> (64 - tzc.addr_width))) &&
(region_base < region_top)));
/* region_base and (region_top + 1) must be 4KB aligned */
assert(((region_base | (region_top + 1)) & (4096 - 1)) == 0);
assert(sec_attr <= TZC_REGION_S_RDWR);
/*
* Inputs look ok, start programming registers.
* All the address registers are 32 bits wide and have a LOW and HIGH
* component used to construct a up to a 64bit address.
*/
tzc_write_region_base_low(tzc.base, region,
(uint32_t)(region_base));
tzc_write_region_base_high(tzc.base, region,
(uint32_t)(region_base >> 32));
tzc_write_region_top_low(tzc.base, region,
(uint32_t)(region_top));
tzc_write_region_top_high(tzc.base, region,
(uint32_t)(region_top >> 32));
/* Assign the region to a filter and set secure attributes */
tzc_write_region_attributes(tzc.base, region,
(sec_attr << REG_ATTR_SEC_SHIFT) | filters);
/*
* Specify which non-secure devices have permission to access this
* region.
*/
tzc_write_region_id_access(tzc.base, region, ns_device_access);
}
void tzc_set_action(tzc_action_t action)
{
assert(tzc.base);
/*
* - Currently no handler is provided to trap an error via interrupt
* or exception.
* - The interrupt action has not been tested.
*/
tzc_write_action(tzc.base, action);
}
void tzc_enable_filters(void)
{
uint32_t state;
uint32_t filter;
assert(tzc.base);
for (filter = 0; filter < tzc.num_filters; filter++) {
state = tzc_get_gate_keeper(tzc.base, filter);
if (state) {
/* The TZC filter is already configured. Changing the
* programmer's view in an active system can cause
* unpredictable behavior therefore panic for now rather
* than try to determine whether this is safe in this
* instance. See:
* http://infocenter.arm.com/help/index.jsp?\
* topic=/com.arm.doc.ddi0504c/CJHHECBF.html */
ERROR("TZC : Filter %d Gatekeeper already enabled.\n",
filter);
panic();
}
tzc_set_gate_keeper(tzc.base, filter, 1);
}
}
void tzc_disable_filters(void)
{
uint32_t filter;
assert(tzc.base);
/*
* We don't do the same state check as above as the Gatekeepers are
* disabled after reset.
*/
for (filter = 0; filter < tzc.num_filters; filter++)
tzc_set_gate_keeper(tzc.base, filter, 0);
}