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FRET-qemu/hw/misc/xlnx-versal-trng.c
Zhao Liu 1e0efa9735 hw/misc/xlnx-versal-trng: Check returned bool in trng_prop_fault_event_set() 
As the comment in qapi/error, dereferencing @errp requires
ERRP_GUARD():

* = Why, when and how to use ERRP_GUARD() =
*
* Without ERRP_GUARD(), use of the @errp parameter is restricted:
* - It must not be dereferenced, because it may be null.
...
* ERRP_GUARD() lifts these restrictions.
*
* To use ERRP_GUARD(), add it right at the beginning of the function.
* @errp can then be used without worrying about the argument being
* NULL or &error_fatal.
*
* Using it when it's not needed is safe, but please avoid cluttering
* the source with useless code.

But in trng_prop_fault_event_set, @errp is dereferenced without
ERRP_GUARD():

visit_type_uint32(v, name, events, errp);
if (*errp) {
    return;
}

Currently, since trng_prop_fault_event_set() doesn't get the NULL @errp
parameter as a "set" method of object property, it hasn't triggered the
bug that dereferencing the NULL @errp.

And since visit_type_uint32() returns bool, check the returned bool
directly instead of dereferencing @errp, then we needn't the add missing
ERRP_GUARD().

Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240223085653.1255438-5-zhao1.liu@linux.intel.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2024-03-12 11:45:33 +01:00

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/*
* Non-crypto strength model of the True Random Number Generator
* in the AMD/Xilinx Versal device family.
*
* Copyright (c) 2017-2020 Xilinx Inc.
* Copyright (c) 2023 Advanced Micro Devices, Inc.
*
* Written by Edgar E. Iglesias <edgar.iglesias@xilinx.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "hw/misc/xlnx-versal-trng.h"
#include "qemu/bitops.h"
#include "qemu/log.h"
#include "qemu/error-report.h"
#include "qemu/guest-random.h"
#include "qemu/timer.h"
#include "qapi/visitor.h"
#include "migration/vmstate.h"
#include "hw/qdev-properties.h"
#ifndef XLNX_VERSAL_TRNG_ERR_DEBUG
#define XLNX_VERSAL_TRNG_ERR_DEBUG 0
#endif
REG32(INT_CTRL, 0x0)
FIELD(INT_CTRL, CERTF_RST, 5, 1)
FIELD(INT_CTRL, DTF_RST, 4, 1)
FIELD(INT_CTRL, DONE_RST, 3, 1)
FIELD(INT_CTRL, CERTF_EN, 2, 1)
FIELD(INT_CTRL, DTF_EN, 1, 1)
FIELD(INT_CTRL, DONE_EN, 0, 1)
REG32(STATUS, 0x4)
FIELD(STATUS, QCNT, 9, 3)
FIELD(STATUS, EAT, 4, 5)
FIELD(STATUS, CERTF, 3, 1)
FIELD(STATUS, DTF, 1, 1)
FIELD(STATUS, DONE, 0, 1)
REG32(CTRL, 0x8)
FIELD(CTRL, PERSODISABLE, 10, 1)
FIELD(CTRL, SINGLEGENMODE, 9, 1)
FIELD(CTRL, EUMODE, 8, 1)
FIELD(CTRL, PRNGMODE, 7, 1)
FIELD(CTRL, TSTMODE, 6, 1)
FIELD(CTRL, PRNGSTART, 5, 1)
FIELD(CTRL, EATAU, 4, 1)
FIELD(CTRL, PRNGXS, 3, 1)
FIELD(CTRL, TRSSEN, 2, 1)
FIELD(CTRL, QERTUEN, 1, 1)
FIELD(CTRL, PRNGSRST, 0, 1)
REG32(CTRL_2, 0xc)
FIELD(CTRL_2, REPCOUNTTESTCUTOFF, 8, 9)
FIELD(CTRL_2, RESERVED_7_5, 5, 3)
FIELD(CTRL_2, DIT, 0, 5)
REG32(CTRL_3, 0x10)
FIELD(CTRL_3, ADAPTPROPTESTCUTOFF, 8, 10)
FIELD(CTRL_3, DLEN, 0, 8)
REG32(CTRL_4, 0x14)
FIELD(CTRL_4, SINGLEBITRAW, 0, 1)
REG32(EXT_SEED_0, 0x40)
REG32(EXT_SEED_1, 0x44)
REG32(EXT_SEED_2, 0x48)
REG32(EXT_SEED_3, 0x4c)
REG32(EXT_SEED_4, 0x50)
REG32(EXT_SEED_5, 0x54)
REG32(EXT_SEED_6, 0x58)
REG32(EXT_SEED_7, 0x5c)
REG32(EXT_SEED_8, 0x60)
REG32(EXT_SEED_9, 0x64)
REG32(EXT_SEED_10, 0x68)
REG32(EXT_SEED_11, 0x6c)
REG32(PER_STRNG_0, 0x80)
REG32(PER_STRNG_1, 0x84)
REG32(PER_STRNG_2, 0x88)
REG32(PER_STRNG_3, 0x8c)
REG32(PER_STRNG_4, 0x90)
REG32(PER_STRNG_5, 0x94)
REG32(PER_STRNG_6, 0x98)
REG32(PER_STRNG_7, 0x9c)
REG32(PER_STRNG_8, 0xa0)
REG32(PER_STRNG_9, 0xa4)
REG32(PER_STRNG_10, 0xa8)
REG32(PER_STRNG_11, 0xac)
REG32(CORE_OUTPUT, 0xc0)
REG32(RESET, 0xd0)
FIELD(RESET, VAL, 0, 1)
REG32(OSC_EN, 0xd4)
FIELD(OSC_EN, VAL, 0, 1)
REG32(TRNG_ISR, 0xe0)
FIELD(TRNG_ISR, SLVERR, 1, 1)
FIELD(TRNG_ISR, CORE_INT, 0, 1)
REG32(TRNG_IMR, 0xe4)
FIELD(TRNG_IMR, SLVERR, 1, 1)
FIELD(TRNG_IMR, CORE_INT, 0, 1)
REG32(TRNG_IER, 0xe8)
FIELD(TRNG_IER, SLVERR, 1, 1)
FIELD(TRNG_IER, CORE_INT, 0, 1)
REG32(TRNG_IDR, 0xec)
FIELD(TRNG_IDR, SLVERR, 1, 1)
FIELD(TRNG_IDR, CORE_INT, 0, 1)
REG32(SLV_ERR_CTRL, 0xf0)
FIELD(SLV_ERR_CTRL, ENABLE, 0, 1)
#define R_MAX (R_SLV_ERR_CTRL + 1)
QEMU_BUILD_BUG_ON(R_MAX * 4 != sizeof_field(XlnxVersalTRng, regs));
#define TRNG_GUEST_ERROR(D, FMT, ...) \
do { \
g_autofree char *p = object_get_canonical_path(OBJECT(D)); \
qemu_log_mask(LOG_GUEST_ERROR, "%s: " FMT, p, ## __VA_ARGS__); \
} while (0)
#define TRNG_WARN(D, FMT, ...) \
do { \
g_autofree char *p = object_get_canonical_path(OBJECT(D)); \
warn_report("%s: " FMT, p, ## __VA_ARGS__); \
} while (0)
static bool trng_older_than_v2(XlnxVersalTRng *s)
{
return s->hw_version < 0x0200;
}
static bool trng_in_reset(XlnxVersalTRng *s)
{
if (ARRAY_FIELD_EX32(s->regs, RESET, VAL)) {
return true;
}
if (ARRAY_FIELD_EX32(s->regs, CTRL, PRNGSRST)) {
return true;
}
return false;
}
static bool trng_test_enabled(XlnxVersalTRng *s)
{
return ARRAY_FIELD_EX32(s->regs, CTRL, TSTMODE);
}
static bool trng_trss_enabled(XlnxVersalTRng *s)
{
if (trng_in_reset(s)) {
return false;
}
if (!ARRAY_FIELD_EX32(s->regs, CTRL, TRSSEN)) {
return false;
}
if (!ARRAY_FIELD_EX32(s->regs, OSC_EN, VAL)) {
return false;
}
return true;
}
static void trng_seed_128(uint32_t *seed, uint64_t h00, uint64_t h64)
{
seed[0] = extract64(h00, 0, 32);
seed[1] = extract64(h00, 32, 32);
seed[2] = extract64(h64, 0, 32);
seed[3] = extract64(h64, 32, 32);
}
static void trng_reseed(XlnxVersalTRng *s)
{
bool ext_seed = ARRAY_FIELD_EX32(s->regs, CTRL, PRNGXS);
bool pers_disabled = ARRAY_FIELD_EX32(s->regs, CTRL, PERSODISABLE);
enum {
U384_U8 = 384 / 8,
U384_U32 = 384 / 32,
};
/*
* Maximum seed length is len(personalized string) + len(ext seed).
*
* g_rand_set_seed_array() takes array of uint32 in host endian.
*/
guint32 gs[U384_U32 * 2], *seed = &gs[U384_U32];
/*
* A disabled personalized string is the same as
* a string with all zeros.
*
* The device's hardware spec defines 3 modes (all selectable
* by guest at will and at anytime):
* 1) External seeding
* This is a PRNG mode, in which the produced sequence shall
* be reproducible if reseeded by the same 384-bit seed, as
* supplied by guest software.
* 2) Test seeding
* This is a PRNG mode, in which the produced sequence shall
* be reproducible if reseeded by a 128-bit test seed, as
* supplied by guest software.
* 3) Truly-random seeding
* This is the TRNG mode, in which the produced sequence is
* periodically reseeded by a crypto-strength entropy source.
*
* To assist debugging of certain classes of software defects,
* this QEMU model implements a 4th mode,
* 4) Forced PRNG
* When in this mode, a reproducible sequence is generated
* if software has selected the TRNG mode (mode 2).
*
* This emulation-only mode can only be selected by setting
* the uint64 property 'forced-prng' to a non-zero value.
* Guest software cannot select this mode.
*/
memset(gs, 0, sizeof(gs));
if (!pers_disabled) {
memcpy(gs, &s->regs[R_PER_STRNG_0], U384_U8);
}
if (ext_seed) {
memcpy(seed, &s->regs[R_EXT_SEED_0], U384_U8);
} else if (trng_test_enabled(s)) {
trng_seed_128(seed, s->tst_seed[0], s->tst_seed[1]);
} else if (s->forced_prng_seed) {
s->forced_prng_count++;
trng_seed_128(seed, s->forced_prng_count, s->forced_prng_seed);
} else {
qemu_guest_getrandom_nofail(seed, U384_U8);
}
g_rand_set_seed_array(s->prng, gs, ARRAY_SIZE(gs));
s->rand_count = 0;
s->rand_reseed = 1ULL << 48;
}
static void trng_regen(XlnxVersalTRng *s)
{
if (s->rand_reseed == 0) {
TRNG_GUEST_ERROR(s, "Too many generations without a reseed");
trng_reseed(s);
}
s->rand_reseed--;
/*
* In real hardware, each regen creates 256 bits, but QCNT
* reports a max of 4.
*/
ARRAY_FIELD_DP32(s->regs, STATUS, QCNT, 4);
s->rand_count = 256 / 32;
}
static uint32_t trng_rdout(XlnxVersalTRng *s)
{
assert(s->rand_count);
s->rand_count--;
if (s->rand_count < 4) {
ARRAY_FIELD_DP32(s->regs, STATUS, QCNT, s->rand_count);
}
return g_rand_int(s->prng);
}
static void trng_irq_update(XlnxVersalTRng *s)
{
bool pending = s->regs[R_TRNG_ISR] & ~s->regs[R_TRNG_IMR];
qemu_set_irq(s->irq, pending);
}
static void trng_isr_postw(RegisterInfo *reg, uint64_t val64)
{
XlnxVersalTRng *s = XLNX_VERSAL_TRNG(reg->opaque);
trng_irq_update(s);
}
static uint64_t trng_ier_prew(RegisterInfo *reg, uint64_t val64)
{
XlnxVersalTRng *s = XLNX_VERSAL_TRNG(reg->opaque);
uint32_t val = val64;
s->regs[R_TRNG_IMR] &= ~val;
trng_irq_update(s);
return 0;
}
static uint64_t trng_idr_prew(RegisterInfo *reg, uint64_t val64)
{
XlnxVersalTRng *s = XLNX_VERSAL_TRNG(reg->opaque);
uint32_t val = val64;
s->regs[R_TRNG_IMR] |= val;
trng_irq_update(s);
return 0;
}
static void trng_core_int_update(XlnxVersalTRng *s)
{
bool pending = false;
uint32_t st = s->regs[R_STATUS];
uint32_t en = s->regs[R_INT_CTRL];
if (FIELD_EX32(st, STATUS, CERTF) && FIELD_EX32(en, INT_CTRL, CERTF_EN)) {
pending = true;
}
if (FIELD_EX32(st, STATUS, DTF) && FIELD_EX32(en, INT_CTRL, DTF_EN)) {
pending = true;
}
if (FIELD_EX32(st, STATUS, DONE) && FIELD_EX32(en, INT_CTRL, DONE_EN)) {
pending = true;
}
ARRAY_FIELD_DP32(s->regs, TRNG_ISR, CORE_INT, pending);
trng_irq_update(s);
}
static void trng_int_ctrl_postw(RegisterInfo *reg, uint64_t val64)
{
XlnxVersalTRng *s = XLNX_VERSAL_TRNG(reg->opaque);
uint32_t v32 = val64;
uint32_t clr_mask = 0;
if (FIELD_EX32(v32, INT_CTRL, CERTF_RST)) {
clr_mask |= R_STATUS_CERTF_MASK;
}
if (FIELD_EX32(v32, INT_CTRL, DTF_RST)) {
clr_mask |= R_STATUS_DTF_MASK;
}
if (FIELD_EX32(v32, INT_CTRL, DONE_RST)) {
clr_mask |= R_STATUS_DONE_MASK;
}
s->regs[R_STATUS] &= ~clr_mask;
trng_core_int_update(s);
}
static void trng_done(XlnxVersalTRng *s)
{
ARRAY_FIELD_DP32(s->regs, STATUS, DONE, true);
trng_core_int_update(s);
}
static void trng_fault_event_set(XlnxVersalTRng *s, uint32_t events)
{
bool pending = false;
/* Disabled TRSS cannot generate any fault event */
if (!trng_trss_enabled(s)) {
return;
}
if (FIELD_EX32(events, STATUS, CERTF)) {
/* In older version, ERTU must be enabled explicitly to get CERTF */
if (trng_older_than_v2(s) &&
!ARRAY_FIELD_EX32(s->regs, CTRL, QERTUEN)) {
TRNG_WARN(s, "CERTF injection ignored: ERTU disabled");
} else {
ARRAY_FIELD_DP32(s->regs, STATUS, CERTF, true);
pending = true;
}
}
if (FIELD_EX32(events, STATUS, DTF)) {
ARRAY_FIELD_DP32(s->regs, STATUS, DTF, true);
pending = true;
}
if (pending) {
trng_core_int_update(s);
}
}
static void trng_soft_reset(XlnxVersalTRng *s)
{
s->rand_count = 0;
s->regs[R_STATUS] = 0;
ARRAY_FIELD_DP32(s->regs, TRNG_ISR, CORE_INT, 0);
}
static void trng_ctrl_postw(RegisterInfo *reg, uint64_t val64)
{
XlnxVersalTRng *s = XLNX_VERSAL_TRNG(reg->opaque);
if (trng_in_reset(s)) {
return;
}
if (FIELD_EX32(val64, CTRL, PRNGSRST)) {
trng_soft_reset(s);
trng_irq_update(s);
return;
}
if (!FIELD_EX32(val64, CTRL, PRNGSTART)) {
return;
}
if (FIELD_EX32(val64, CTRL, PRNGMODE)) {
trng_regen(s);
} else {
trng_reseed(s);
}
trng_done(s);
}
static void trng_ctrl4_postw(RegisterInfo *reg, uint64_t val64)
{
XlnxVersalTRng *s = XLNX_VERSAL_TRNG(reg->opaque);
/* Only applies to test mode with TRSS enabled */
if (!trng_test_enabled(s) || !trng_trss_enabled(s)) {
return;
}
/* Shift in a single bit. */
s->tst_seed[1] <<= 1;
s->tst_seed[1] |= s->tst_seed[0] >> 63;
s->tst_seed[0] <<= 1;
s->tst_seed[0] |= val64 & 1;
trng_reseed(s);
trng_regen(s);
}
static uint64_t trng_core_out_postr(RegisterInfo *reg, uint64_t val)
{
XlnxVersalTRng *s = XLNX_VERSAL_TRNG(reg->opaque);
bool oneshot = ARRAY_FIELD_EX32(s->regs, CTRL, SINGLEGENMODE);
bool start = ARRAY_FIELD_EX32(s->regs, CTRL, PRNGSTART);
uint32_t r = 0xbad;
if (trng_in_reset(s)) {
TRNG_GUEST_ERROR(s, "Reading random number while in reset!");
return r;
}
if (s->rand_count == 0) {
TRNG_GUEST_ERROR(s, "Reading random number when unavailable!");
return r;
}
r = trng_rdout(s);
/* Automatic mode regenerates when half the output reg is empty. */
if (!oneshot && start && s->rand_count <= 3) {
trng_regen(s);
}
return r;
}
static void trng_reset(XlnxVersalTRng *s)
{
unsigned int i;
s->forced_prng_count = 0;
for (i = 0; i < ARRAY_SIZE(s->regs_info); ++i) {
register_reset(&s->regs_info[i]);
}
trng_soft_reset(s);
trng_irq_update(s);
}
static uint64_t trng_reset_prew(RegisterInfo *reg, uint64_t val64)
{
XlnxVersalTRng *s = XLNX_VERSAL_TRNG(reg->opaque);
if (!ARRAY_FIELD_EX32(s->regs, RESET, VAL) &&
FIELD_EX32(val64, RESET, VAL)) {
trng_reset(s);
}
return val64;
}
static uint64_t trng_register_read(void *opaque, hwaddr addr, unsigned size)
{
/*
* Guest provided seed and personalized strings cannot be
* read back, and read attempts return value of A_STATUS.
*/
switch (addr) {
case A_EXT_SEED_0 ... A_PER_STRNG_11:
addr = A_STATUS;
break;
}
return register_read_memory(opaque, addr, size);
}
static void trng_register_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
RegisterInfoArray *reg_array = opaque;
XlnxVersalTRng *s = XLNX_VERSAL_TRNG(reg_array->r[0]->opaque);
if (trng_older_than_v2(s)) {
switch (addr) {
case A_CTRL:
value = FIELD_DP64(value, CTRL, PERSODISABLE, 0);
value = FIELD_DP64(value, CTRL, SINGLEGENMODE, 0);
break;
case A_CTRL_2:
case A_CTRL_3:
case A_CTRL_4:
return;
}
} else {
switch (addr) {
case A_CTRL:
value = FIELD_DP64(value, CTRL, EATAU, 0);
value = FIELD_DP64(value, CTRL, QERTUEN, 0);
break;
}
}
register_write_memory(opaque, addr, value, size);
}
static RegisterAccessInfo trng_regs_info[] = {
{ .name = "INT_CTRL", .addr = A_INT_CTRL,
.post_write = trng_int_ctrl_postw,
},{ .name = "STATUS", .addr = A_STATUS,
.ro = 0xfff,
},{ .name = "CTRL", .addr = A_CTRL,
.post_write = trng_ctrl_postw,
},{ .name = "CTRL_2", .addr = A_CTRL_2,
.reset = 0x210c,
},{ .name = "CTRL_3", .addr = A_CTRL_3,
.reset = 0x26f09,
},{ .name = "CTRL_4", .addr = A_CTRL_4,
.post_write = trng_ctrl4_postw,
},{ .name = "EXT_SEED_0", .addr = A_EXT_SEED_0,
},{ .name = "EXT_SEED_1", .addr = A_EXT_SEED_1,
},{ .name = "EXT_SEED_2", .addr = A_EXT_SEED_2,
},{ .name = "EXT_SEED_3", .addr = A_EXT_SEED_3,
},{ .name = "EXT_SEED_4", .addr = A_EXT_SEED_4,
},{ .name = "EXT_SEED_5", .addr = A_EXT_SEED_5,
},{ .name = "EXT_SEED_6", .addr = A_EXT_SEED_6,
},{ .name = "EXT_SEED_7", .addr = A_EXT_SEED_7,
},{ .name = "EXT_SEED_8", .addr = A_EXT_SEED_8,
},{ .name = "EXT_SEED_9", .addr = A_EXT_SEED_9,
},{ .name = "EXT_SEED_10", .addr = A_EXT_SEED_10,
},{ .name = "EXT_SEED_11", .addr = A_EXT_SEED_11,
},{ .name = "PER_STRNG_0", .addr = A_PER_STRNG_0,
},{ .name = "PER_STRNG_1", .addr = A_PER_STRNG_1,
},{ .name = "PER_STRNG_2", .addr = A_PER_STRNG_2,
},{ .name = "PER_STRNG_3", .addr = A_PER_STRNG_3,
},{ .name = "PER_STRNG_4", .addr = A_PER_STRNG_4,
},{ .name = "PER_STRNG_5", .addr = A_PER_STRNG_5,
},{ .name = "PER_STRNG_6", .addr = A_PER_STRNG_6,
},{ .name = "PER_STRNG_7", .addr = A_PER_STRNG_7,
},{ .name = "PER_STRNG_8", .addr = A_PER_STRNG_8,
},{ .name = "PER_STRNG_9", .addr = A_PER_STRNG_9,
},{ .name = "PER_STRNG_10", .addr = A_PER_STRNG_10,
},{ .name = "PER_STRNG_11", .addr = A_PER_STRNG_11,
},{ .name = "CORE_OUTPUT", .addr = A_CORE_OUTPUT,
.ro = 0xffffffff,
.post_read = trng_core_out_postr,
},{ .name = "RESET", .addr = A_RESET,
.reset = 0x1,
.pre_write = trng_reset_prew,
},{ .name = "OSC_EN", .addr = A_OSC_EN,
},{ .name = "TRNG_ISR", .addr = A_TRNG_ISR,
.w1c = 0x3,
.post_write = trng_isr_postw,
},{ .name = "TRNG_IMR", .addr = A_TRNG_IMR,
.reset = 0x3,
.ro = 0x3,
},{ .name = "TRNG_IER", .addr = A_TRNG_IER,
.pre_write = trng_ier_prew,
},{ .name = "TRNG_IDR", .addr = A_TRNG_IDR,
.pre_write = trng_idr_prew,
},{ .name = "SLV_ERR_CTRL", .addr = A_SLV_ERR_CTRL,
}
};
static const MemoryRegionOps trng_ops = {
.read = trng_register_read,
.write = trng_register_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
};
static void trng_init(Object *obj)
{
XlnxVersalTRng *s = XLNX_VERSAL_TRNG(obj);
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
RegisterInfoArray *reg_array;
reg_array =
register_init_block32(DEVICE(obj), trng_regs_info,
ARRAY_SIZE(trng_regs_info),
s->regs_info, s->regs,
&trng_ops,
XLNX_VERSAL_TRNG_ERR_DEBUG,
R_MAX * 4);
sysbus_init_mmio(sbd, &reg_array->mem);
sysbus_init_irq(sbd, &s->irq);
s->prng = g_rand_new();
}
static void trng_unrealize(DeviceState *dev)
{
XlnxVersalTRng *s = XLNX_VERSAL_TRNG(dev);
g_rand_free(s->prng);
s->prng = NULL;
}
static void trng_reset_hold(Object *obj)
{
trng_reset(XLNX_VERSAL_TRNG(obj));
}
static void trng_prop_fault_event_set(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
Property *prop = opaque;
uint32_t *events = object_field_prop_ptr(obj, prop);
if (!visit_type_uint32(v, name, events, errp)) {
return;
}
trng_fault_event_set(XLNX_VERSAL_TRNG(obj), *events);
}
static const PropertyInfo trng_prop_fault_events = {
.name = "uint32:bits",
.description = "Set to trigger TRNG fault events",
.set = trng_prop_fault_event_set,
.realized_set_allowed = true,
};
static PropertyInfo trng_prop_uint64; /* to extend qdev_prop_uint64 */
static Property trng_props[] = {
DEFINE_PROP_UINT64("forced-prng", XlnxVersalTRng, forced_prng_seed, 0),
DEFINE_PROP_UINT32("hw-version", XlnxVersalTRng, hw_version, 0x0200),
DEFINE_PROP("fips-fault-events", XlnxVersalTRng, forced_faults,
trng_prop_fault_events, uint32_t),
DEFINE_PROP_END_OF_LIST(),
};
static const VMStateDescription vmstate_trng = {
.name = TYPE_XLNX_VERSAL_TRNG,
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_UINT32(rand_count, XlnxVersalTRng),
VMSTATE_UINT64(rand_reseed, XlnxVersalTRng),
VMSTATE_UINT64(forced_prng_count, XlnxVersalTRng),
VMSTATE_UINT64_ARRAY(tst_seed, XlnxVersalTRng, 2),
VMSTATE_UINT32_ARRAY(regs, XlnxVersalTRng, R_MAX),
VMSTATE_END_OF_LIST(),
}
};
static void trng_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
ResettableClass *rc = RESETTABLE_CLASS(klass);
dc->vmsd = &vmstate_trng;
dc->unrealize = trng_unrealize;
rc->phases.hold = trng_reset_hold;
/* Clone uint64 property with set allowed after realized */
trng_prop_uint64 = qdev_prop_uint64;
trng_prop_uint64.realized_set_allowed = true;
trng_props[0].info = &trng_prop_uint64;
device_class_set_props(dc, trng_props);
}
static const TypeInfo trng_info = {
.name = TYPE_XLNX_VERSAL_TRNG,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(XlnxVersalTRng),
.class_init = trng_class_init,
.instance_init = trng_init,
};
static void trng_register_types(void)
{
type_register_static(&trng_info);
}
type_init(trng_register_types)
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