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first draft version of PLIC

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This commit is contained in:
Soeren Jung
2017-09-25 13:07:04 +02:00
parent 4b25eb0b29
commit f2fc62fbb8
9 changed files with 459 additions and 41 deletions
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19
examples/simple_system/gen/e300_plat_t.h
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@@ -1,11 +1,26 @@
/*******************************************************************************
* Copyright 2017 eyck@minres.com
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
******************************************************************************/
#ifndef _E300_PLAT_MAP_H_
#define _E300_PLAT_MAP_H_
// need double braces, see https://stackoverflow.com/questions/6893700/how-to-construct-stdarray-object-with-initializer-list#6894191
const std::array<sysc::target_memory_map_entry<32>, 4> e300_plat_map = {{
{&i_plic, 0xc000000, 0x1000},
{&i_plic, 0x0c000000, 0x200008},
{&i_gpio, 0x10012000, 0x1000},
{&i_uart, 0x10013000, 0x1000},
{&i_spi, 0x10014000, 0x1000},
{&i_spi, 0x10014000, 0x1000},
}};
#endif /* _E300_PLAT_MAP_H_ */

7
examples/simple_system/gen/plic_regs.h
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@@ -47,7 +47,7 @@ class plic_regs :
public sc_core::sc_module,
public sysc::resetable
{
protected:
public:
// storage declarations
BEGIN_BF_DECL(priority_t, uint32_t);
BF_FIELD(priority, 0, 3);
@@ -71,7 +71,6 @@ protected:
sysc::sc_register<threshold_t> threshold;
sysc::sc_register<uint32_t> claim_complete;
public:
plic_regs(sc_core::sc_module_name nm);
template<unsigned BUSWIDTH=32>
@@ -97,8 +96,8 @@ inline void sysc::plic_regs::registerResources(sysc::tlm_target<BUSWIDTH>& targe
target.addResource(priority, 0x4UL);
target.addResource(pending, 0x1000UL);
target.addResource(enabled, 0x2000UL);
target.addResource(threshold, 0xc200000UL);
target.addResource(claim_complete, 0xc200004UL);
target.addResource(threshold, 0x00200000UL);
target.addResource(claim_complete, 0x00200004UL);
}
#endif // _PLIC_REGS_H_

172
examples/simple_system/plic.cpp
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@@ -1,22 +1,45 @@
////////////////////////////////////////////////////////////////////////////////
// Copyright 2017 eyck@minres.com
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
// Copyright (C) 2017, MINRES Technologies GmbH
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. 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.
//
// 3. Neither the name of the copyright holder 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 LIABILITY0x200004, 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.
//
// Contributors:
// eyck@minres.com - initial API and implementation
//
//
////////////////////////////////////////////////////////////////////////////////
// todo: truncate values beyond 7 (in prio_threshold write_cb)
#include "plic.h"
#include "gen/plic_regs.h"
#include "sysc/utilities.h"
#include <sysc/report.h>
namespace sysc {
@@ -25,27 +48,146 @@ plic::plic(sc_core::sc_module_name nm)
, tlm_target<>(clk)
, NAMED(clk_i)
, NAMED(rst_i)
, NAMED(global_interrupts_i, 256)
, NAMED(core_interrupt_o)
, NAMEDD(plic_regs, regs)
{
regs->registerResources(*this);
// register callbacks
init_callbacks();
regs->claim_complete.set_write_cb(m_claim_complete_write_cb);
// port callbacks
SC_METHOD(global_int_port_cb);
for(uint8_t i = 0; i<255; i++) {
sensitive << global_interrupts_i[i].pos();
}
dont_initialize();
// register event callbacks
SC_METHOD(clock_cb);
sensitive<<clk_i;
SC_METHOD(reset_cb);
sensitive<<rst_i;
}
plic::~plic() {
}
void plic::clock_cb() {
void plic::init_callbacks()
{
m_claim_complete_write_cb = [=](sysc::sc_register<uint32_t> reg, uint32_t v)->bool {
reg.put(v);
reset_pending_int(v);
// std::cout << "Value of register: 0x" << std::hex << reg << std::endl;
// todo: reset related interrupt and find next high-prio interrupt
return true;
};
}
void plic::clock_cb()
{
this->clk=clk_i.read();
}
void plic::reset_cb() {
void plic::reset_cb()
{
if(rst_i.read())
regs->reset_start();
else
regs->reset_stop();
}
// Functional handling of interrupts:
// - global_int_port_cb()
// - set pending register bits
// - called by: incoming global_int
// - handle_pending_int()
// - update claim register content
// - generate core-interrupt pulse
// - called by:
// - incoming global_int
// - complete-register write access
// - reset_pending_int(int-id)
// - reset pending bit
// - call next handle_pending_int()
// - called by:
// - complete-reg write register content
void plic::global_int_port_cb()
{
// set related pending bit if enable is set for incoming global_interrupt
// todo: extend up to 255 bits (limited to 32 right now)
for(uint32_t i = 1; i<32; i++) {
uint32_t enable_bits = regs->r_enabled;
bool enable = enable_bits & (0x1 << i); // read enable bit
if ( enable && global_interrupts_i[i].read() == 1 ) {
regs->r_pending = regs->r_pending | ( 0x1 << i);
LOG(logging::INFO) << "pending interrupt identified: " << i;
}
}
handle_pending_int();
}
void plic::handle_pending_int()
{
// identify high-prio pending interrupt and raise a core-interrupt
uint32_t claim_int = 0; // claim interrupt
uint32_t claim_prio = 0; // related priority (highest prio interrupt wins the race)
bool raise_int = 0;
uint32_t thold = regs->r_threshold.threshold; // threshold value
// todo: extend up to 255 bits (limited to 32 right now)
for(uint32_t i = 1; i<32; i++) {
uint32_t pending_bits = regs->r_pending;
bool pending = (pending_bits & (0x1 << i)) ? true : false;
uint32_t prio = regs->r_priority[i-1].priority; // read priority value
if ( pending && thold < prio )
{
regs->r_pending = regs->r_pending | ( 0x1 << i);
// below condition ensures implicitly that lowest id is selected in case of multiple identical priority-interrupts
if ( prio > claim_prio ) {
claim_prio = prio;
claim_int = i;
raise_int = 1;
LOG(logging::INFO) << "pending interrupt activated: " << i;
}
}
}
if ( raise_int ) {
regs->r_claim_complete = claim_int;
core_interrupt_o.write(1);
// todo: evluate clock period
} else {
regs->r_claim_complete = 0;
LOG(logging::INFO) << "no further pending interrupt.";
}
}
void plic::reset_pending_int(uint32_t irq)
{
// todo: evaluate enable register (see spec)
// todo: make sure that pending is set, otherwise don't reset irq ... read spec.
LOG(logging::INFO) << "reset pending interrupt: " << irq;
// reset related pending bit
regs->r_pending &= ~(0x1 << irq);
core_interrupt_o.write(0);
// evaluate next pending interrupt
handle_pending_int();
}
} /* namespace sysc */

18
examples/simple_system/plic.h
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@@ -18,6 +18,7 @@
#define _PLIC_H_
#include <sysc/tlm_target.h>
#include <sysc/register.h>
namespace sysc {
@@ -26,15 +27,28 @@ class plic_regs;
class plic: public sc_core::sc_module, public tlm_target<> {
public:
SC_HAS_PROCESS(plic);
sc_core::sc_in<sc_core::sc_time> clk_i;
sc_core::sc_in<bool> rst_i;
sc_core::sc_in<sc_core::sc_time> clk_i;
sc_core::sc_in<bool> rst_i;
sc_core::sc_vector<sc_core::sc_in<bool>> global_interrupts_i;
sc_core::sc_out<bool> core_interrupt_o;
sc_core::sc_event raise_int_ev;
sc_core::sc_event clear_int_ev;
plic(sc_core::sc_module_name nm);
virtual ~plic();
protected:
void clock_cb();
void reset_cb();
void init_callbacks();
void global_int_port_cb();
void handle_pending_int();
void reset_pending_int(uint32_t irq);
void raise_core_interrupt();
void clear_core_interrupt();
sc_core::sc_time clk;
std::unique_ptr<plic_regs> regs;
std::function<bool(sc_register<uint32_t>,uint32_t)> m_claim_complete_write_cb;
};
} /* namespace sysc */

2
examples/simple_system/sc_main.cpp
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@@ -89,7 +89,7 @@ int sc_main(int argc, char* argv[]){
if(!sc_core::sc_end_of_simulation_invoked()) {
LOG(logging::ERROR) << "simulation timed out";
sc_stop();
sc_core::sc_stop();
}
return 0;
}

15
examples/simple_system/simple_system.cpp
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@@ -34,14 +34,21 @@ simple_system::simple_system(sc_core::sc_module_name nm)
, NAMED(i_plic)
, NAMED(s_clk)
, NAMED(s_rst)
, NAMED(s_global_interrupts, 256)
, NAMED(s_core_interrupt)
{
// todo: discuss naming conventions (s_<signal> vs. <port>_i/_o) --> covnert into _s
// bus connections
i_master.intor(i_router.target[0]);
size_t i=0;
for(const auto& e: e300_plat_map){
i_router.initiator.at(i)(e.target->socket);
i_router.initiator[i](e.target->socket);
i_router.add_target_range(i, e.start, e.size);
i++;
}
// clock/reset connections
i_uart.clk_i(s_clk);
i_spi.clk_i(s_clk);
i_gpio.clk_i(s_clk);
@@ -54,6 +61,12 @@ simple_system::simple_system(sc_core::sc_module_name nm)
i_plic.rst_i(s_rst);
i_master.rst_i(s_rst);
// interrupt connections
i_plic.core_interrupt_o(s_core_interrupt);
i_plic.global_interrupts_i.bind(s_global_interrupts);
i_master.global_interrupts_o(s_global_interrupts);
i_master.core_interrupt_i(s_core_interrupt);
SC_THREAD(gen_reset);
}

2
examples/simple_system/simple_system.h
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@@ -48,6 +48,8 @@ public:
plic i_plic;
sc_core::sc_signal<sc_core::sc_time> s_clk;
sc_core::sc_signal<bool> s_rst;
sc_core::sc_vector<sc_core::sc_signal<bool>> s_global_interrupts;
sc_core::sc_signal<bool> s_core_interrupt;
simple_system(sc_core::sc_module_name nm);
protected:

251
examples/simple_system/test_initiator.cpp
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@@ -21,43 +21,266 @@
*/
#include "test_initiator.h"
#include <sr_report/sr_report.h>
#include <sysc/report.h>
#include <sysc/utilities.h>
#include <array>
namespace sysc {
// todo: move into gen folder somewhere (adapt code-generator)
#define PLIC_PRIO1_REG 0x0C000004
#define PLIC_PRIO2_REG 0x0C000008
#define PLIC_PRIO3_REG 0x0C00000C
#define PLIC_PRIO4_REG 0x0C000010
#define PLIC_PENDING_REG 0x0C001000
#define PLIC_ENABLE_REG 0x0C002000
#define PLIC_PRIO_TRESHOLD_REG 0x0C200000
#define PLIC_CLAIM_COMPLETE_REG 0x0C200004
namespace sysc {
test_initiator::test_initiator(sc_core::sc_module_name nm)
: sc_core::sc_module(nm)
, NAMED(intor)
, NAMED(rst_i)
, NAMED(global_interrupts_o, 256)
, NAMED(core_interrupt_i)
{
SC_THREAD(run);
SC_THREAD(run);
SC_METHOD(core_irq_handler);
sensitive << core_interrupt_i;
dont_initialize();
}
void test_initiator::run() {
void test_initiator::run()
{
// wait for reset
if(rst_i.read()==false) wait(rst_i.posedge_event());
wait(rst_i.negedge_event());
wait(10_ns);
// apply test-sequences
test_unique_irq();
test_frequent_irq();
test_parallel_irq();
test_irq_stress();
// todo: review irq sequences from FW point of view ... expected ???
}
void test_initiator::test_unique_irq()
{
//// enable reg is not set
// -> irq to be ignored
// -> no core_interrupt
// -> no entry in pending reg
// generate interrupt pulse (note: 1 is lowest usable register)
global_interrupts_o[2].write(1);
wait(10_ns);
global_interrupts_o[2].write(0);
wait(10_ns);
reg_check(PLIC_PENDING_REG, 0x0);
wait(10_ns);
reg_check(PLIC_CLAIM_COMPLETE_REG, 0x0);
wait(10_ns);
//// enable reg is set, then
// -> pending bit change expected
// -> core_interrupt expected
uint32_t v = read_bus(PLIC_PRIO1_REG);
wait(10_ns);
// enable single interrupt
write_bus(PLIC_PRIO1_REG, 0x1);
wait(10_ns);
write_bus(PLIC_ENABLE_REG, 0x2);
wait(10_ns);
// generate interrupt pulse (note: 1 is lowest usable register)
global_interrupts_o[1].write(1);
wait(10_ns);
global_interrupts_o[1].write(0);
wait(10_ns);
// read claim_complete register
reg_check(PLIC_PENDING_REG, 0x2);
wait(10_ns);
reg_check(PLIC_CLAIM_COMPLETE_REG, 0x1);
wait(10_ns);
//// after writing to claim_complete reg (per fw)
// -> pending bit expected to be unset
// -> enable bit expected to be set ... test with / without enable being set
write_bus(PLIC_CLAIM_COMPLETE_REG, 0x1);
wait(10_ns);
reg_check(PLIC_PENDING_REG, 0x0);
wait(10_ns);
reg_check(PLIC_CLAIM_COMPLETE_REG, 0x0);
wait(10_ns);
// todo: remove wait statements once the tlm_initiator is in place
// todo: evaluate error messages ... provide correct pass/fail verdict
wait(100_ns);
}
void test_initiator::test_frequent_irq()
{
}
void test_initiator::test_parallel_irq()
{
//// create three parallel global_int requests
// -> read and clear bits one after the other
// -> different priorities applied (reverse order)
// -> correct priority handing expected
// -> three core interrupts expected in total
// reverse order priority configuration
write_bus(PLIC_PRIO1_REG, 0x3);
wait(10_ns);
write_bus(PLIC_PRIO2_REG, 0x2);
wait(10_ns);
write_bus(PLIC_PRIO3_REG, 0x1);
wait(10_ns);
// enable all three interrupts
write_bus(PLIC_ENABLE_REG, 0xE);
wait(10_ns);
// generate interrupt pulse (note: 1 is lowest usable register)
global_interrupts_o[1].write(1);
wait(10_ns);
global_interrupts_o[1].write(0);
wait(10_ns);
global_interrupts_o[2].write(1);
wait(10_ns);
global_interrupts_o[2].write(0);
wait(10_ns);
global_interrupts_o[3].write(1);
wait(10_ns);
global_interrupts_o[3].write(0);
wait(10_ns);
// expect three pending registers
reg_check(PLIC_PENDING_REG, 0xE);
wait(10_ns);
// expect lowest interrupt id to be highest int
reg_check(PLIC_CLAIM_COMPLETE_REG, 0x1);
wait(10_ns);
//// after writing to claim_complete reg (per fw)
// -> next int to become highest irq
write_bus(PLIC_CLAIM_COMPLETE_REG, 0x1);
wait(10_ns);
reg_check(PLIC_PENDING_REG, 0xC);
wait(10_ns);
reg_check(PLIC_CLAIM_COMPLETE_REG, 0x2);
wait(10_ns);
//// after writing to claim_complete reg again (per fw)
// -> next int to become highest irq
write_bus(PLIC_CLAIM_COMPLETE_REG, 0x2);
wait(10_ns);
reg_check(PLIC_PENDING_REG, 0x8);
wait(10_ns);
reg_check(PLIC_CLAIM_COMPLETE_REG, 0x3);
wait(10_ns);
//// after last writing to claim_complete reg again (per fw)
// -> no further pending irq expected
write_bus(PLIC_CLAIM_COMPLETE_REG, 0x3);
wait(10_ns);
reg_check(PLIC_PENDING_REG, 0x0);
wait(10_ns);
reg_check(PLIC_CLAIM_COMPLETE_REG, 0x0);
wait(10_ns);
// todo: advance upon register-write access ... remove above 10_ns waits
// todo: evaluate error messages ... provide correct pass/fail verdict
wait(100_ns);
}
void test_initiator::test_irq_stress()
{
}
void test_initiator::write_bus(std::uint32_t adr, std::uint32_t dat)
{
tlm::tlm_generic_payload gp;
std::array<uint8_t, 4> data;
srInfo()("group", "comm")("read access");
gp.set_command(tlm::TLM_READ_COMMAND);
// gp.set_address(0x10012000);
gp.set_address(0xc000004);
data[3] = 0xff & dat>>24;
data[2] = 0xff & dat>>16;
data[1] = 0xff & dat>>8;
data[0] = 0xff & dat;
LOG(logging::INFO) << "write_bus(0x" << std::hex << adr << ") : " << dat;
gp.set_command(tlm::TLM_WRITE_COMMAND);
gp.set_address(adr);
gp.set_data_ptr(data.data());
gp.set_data_length(data.size());
gp.set_streaming_width(4);
sc_core::sc_time delay;
intor->b_transport(gp, delay);
wait(10_ns);
srWarn()("group", "comm")("write access");
gp.set_command(tlm::TLM_WRITE_COMMAND);
gp.set_address(0x10012000);
data[0]=0xA5;
if ( gp.get_response_status() != tlm::TLM_OK_RESPONSE ) {
throw std::exception();
}
}
std::uint32_t test_initiator::read_bus(std::uint32_t adr)
{
tlm::tlm_generic_payload gp;
std::array<uint8_t, 4> data;
gp.set_command(tlm::TLM_READ_COMMAND);
gp.set_address(adr);
gp.set_data_ptr(data.data());
gp.set_data_length(data.size());
gp.set_streaming_width(4);
sc_core::sc_time delay;
intor->b_transport(gp, delay);
wait(10_ns);
if ( gp.get_response_status() != tlm::TLM_OK_RESPONSE ) {
// todo: improve output in case of exception, define own exception class to carry transaction-infos
// ... i.e. out-of-range report with info about legal mem boundaries
throw std::exception();
}
// todo: use reinterpret_cast instead
std::uint32_t rdat = data[3]<<24 | data[2]<<16 | data[1]<<8 | data[0];
LOG(logging::INFO) << "read_bus(0x" << std::hex << adr << ") -> " << rdat;
return rdat;
}
void test_initiator::reg_check(std::uint32_t adr, std::uint32_t exp)
{
uint32_t dat = read_bus(adr);
if ( dat != exp ) {
LOG(logging::ERROR) << "register check failed for address 0x" << std::hex << adr << ": " << dat << " != " << exp;
} else {
LOG(logging::INFO) << "register check passed for address 0x" << std::hex << adr << ": " << dat;
}
}
void test_initiator::core_irq_handler()
{
LOG(logging::INFO) << "core_interrupt_i edge detected -> " << core_interrupt_i.read();
}
} /* namespace sysc */

14
examples/simple_system/test_initiator.h
View File

@@ -32,11 +32,21 @@ class test_initiator: public sc_core::sc_module {
public:
SC_HAS_PROCESS(test_initiator);
tlm_utils::simple_initiator_socket<test_initiator, 32> intor;
sc_core::sc_in<bool> rst_i;
sc_core::sc_vector<sc_core::sc_out<bool>> global_interrupts_o;
sc_core::sc_in<bool> core_interrupt_i;
sc_core::sc_in<bool> rst_i;
test_initiator(sc_core::sc_module_name nm);
protected:
void run();
void test_unique_irq();
void test_frequent_irq();
void test_parallel_irq();
void test_irq_stress();
void write_bus(std::uint32_t adr, std::uint32_t dat);
std::uint32_t read_bus(std::uint32_t adr);
void reg_check(std::uint32_t adr, std::uint32_t exp);
void core_irq_handler();
};
} /* namespace sysc */