From 71e2e98d07499c6d0f31596fec52cd8cef5813a9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
Date: Fri, 5 Jan 2018 18:14:53 +0100
Subject: Implement machine restart

---
 qtmips_machine/core.cpp          | 25 +++++++++++++++++--------
 qtmips_machine/core.h            |  6 ++++++
 qtmips_machine/memory.cpp        | 10 ++++++++++
 qtmips_machine/memory.h          |  3 +++
 qtmips_machine/qtmipsmachine.cpp |  7 ++++++-
 qtmips_machine/registers.cpp     | 13 +++++++++----
 qtmips_machine/registers.h       |  2 ++
 7 files changed, 53 insertions(+), 13 deletions(-)

diff --git a/qtmips_machine/core.cpp b/qtmips_machine/core.cpp
index 53b7cad..faebd87 100644
--- a/qtmips_machine/core.cpp
+++ b/qtmips_machine/core.cpp
@@ -259,11 +259,11 @@ void Core::dtMemoryInit(struct dtMemory &dt) {
 
 CoreSingle::CoreSingle(Registers *regs, MemoryAccess *mem, bool jmp_delay_slot) : \
     Core(regs, mem) {
-    if (jmp_delay_slot) {
+    if (jmp_delay_slot)
         jmp_delay_decode = new struct Core::dtDecode();
-        dtDecodeInit(*jmp_delay_decode);
-    } else
+    else
         jmp_delay_decode = nullptr;
+    reset();
 }
 
 CoreSingle::~CoreSingle() {
@@ -284,16 +284,18 @@ void CoreSingle::step() {
         handle_pc(d);
 }
 
+void CoreSingle::reset() {
+    if (jmp_delay_decode != nullptr)
+        Core::dtDecodeInit(*jmp_delay_decode);
+}
+
 CorePipelined::CorePipelined(Registers *regs, MemoryAccess *mem) : \
     Core(regs, mem) {
-    dtFetchInit(dt_f);
-    dtDecodeInit(dt_d);
-    dtExecuteInit(dt_e);
-    dtMemoryInit(dt_m);
+    reset();
 }
 
 void CorePipelined::step() {
-    // TODO implement pipelined
+    // TODO implement forward unit
     writeback(dt_m);
     dt_m =memory(dt_e);
     dt_e = execute(dt_d);
@@ -301,3 +303,10 @@ void CorePipelined::step() {
     dt_f = fetch();
     handle_pc(dt_d);
 }
+
+void CorePipelined::reset() {
+    dtFetchInit(dt_f);
+    dtDecodeInit(dt_d);
+    dtExecuteInit(dt_e);
+    dtMemoryInit(dt_m);
+}
diff --git a/qtmips_machine/core.h b/qtmips_machine/core.h
index 7d38d79..1878bfc 100644
--- a/qtmips_machine/core.h
+++ b/qtmips_machine/core.h
@@ -17,6 +17,8 @@ public:
 
     virtual void step() = 0; // Do single step
 
+    virtual void reset() = 0; // Reset core (only core, memory and registers has to be reseted separately)
+
 signals:
     void instruction_fetched(machine::Instruction &inst);
 
@@ -75,6 +77,8 @@ public:
 
     void step();
 
+    void reset();
+
 private:
     struct Core::dtDecode *jmp_delay_decode;
 };
@@ -85,6 +89,8 @@ public:
 
     void step();
 
+    void reset();
+
 private:
     struct Core::dtFetch dt_f;
     struct Core::dtDecode dt_d;
diff --git a/qtmips_machine/memory.cpp b/qtmips_machine/memory.cpp
index 142c750..69f7d54 100644
--- a/qtmips_machine/memory.cpp
+++ b/qtmips_machine/memory.cpp
@@ -178,6 +178,16 @@ Memory::~Memory() {
     free_section_tree(this->mt_root, 0);
 }
 
+void Memory::reset() {
+    free_section_tree(this->mt_root, 0);
+    this->mt_root = allocate_section_tree();
+}
+
+void Memory::reset(const Memory &m) {
+    free_section_tree(this->mt_root, 0);
+    this->mt_root = copy_section_tree(m.get_memorytree_root(), 0);
+}
+
 // Create address mask with section length
 #define ADDRESS_MASK(LEN) ((1 << (LEN)) - 1)
 
diff --git a/qtmips_machine/memory.h b/qtmips_machine/memory.h
index ab33e4a..3bd1060 100644
--- a/qtmips_machine/memory.h
+++ b/qtmips_machine/memory.h
@@ -43,6 +43,7 @@ public:
 
     void write_byte(std::uint32_t offset, std::uint8_t value);
     std::uint8_t read_byte(std::uint32_t offset) const;
+    void merge(MemorySection&);
 
     std::uint32_t length() const;
     const std::uint8_t* data() const;
@@ -71,6 +72,8 @@ public:
     Memory();
     Memory(const Memory&);
     ~Memory();
+    void reset(); // Reset whole content of memory (removes old tree and creates new one)
+    void reset(const Memory&);
 
     MemorySection *get_section(std::uint32_t address, bool create) const; // returns section containing given address
     void write_byte(std::uint32_t address, std::uint8_t value);
diff --git a/qtmips_machine/qtmipsmachine.cpp b/qtmips_machine/qtmipsmachine.cpp
index 744c5e2..1d7523c 100644
--- a/qtmips_machine/qtmipsmachine.cpp
+++ b/qtmips_machine/qtmipsmachine.cpp
@@ -110,7 +110,12 @@ void QtMipsMachine::step() {
 }
 
 void QtMipsMachine::restart() {
-    // TODO
+    pause();
+    regs->reset();
+    mem->reset(*mem_program_only);
+    // TODO cache
+    cr->reset();
+    set_status(ST_READY);
 }
 
 void QtMipsMachine::set_status(enum Status st) {
diff --git a/qtmips_machine/registers.cpp b/qtmips_machine/registers.cpp
index 447fdfc..5a720f7 100644
--- a/qtmips_machine/registers.cpp
+++ b/qtmips_machine/registers.cpp
@@ -10,10 +10,7 @@ using namespace machine;
 //////////////////////////////////////////////////////////////////////////////
 
 Registers::Registers() : QObject() {
-    this->pc = PC_INIT; // Initialize to beginning program section
-    for (int i = 0; i < 31; i++)
-        this->gp[i] = 0;
-    this->hi = this->lo = 0;
+    reset();
 }
 
 Registers::Registers(const Registers &orig) : QObject() {
@@ -99,3 +96,11 @@ bool Registers::operator==(const Registers &c) const {
 bool Registers::operator!=(const Registers &c) const {
     return ! this->operator==(c);
 }
+
+void Registers::reset() {
+    pc_abs_jmp(PC_INIT); // Initialize to beginning program section
+    for (int i = 1; i < 32; i++)
+        write_gp(i, 0);
+    write_hi_lo(false, 0);
+    write_hi_lo(true, 0);
+}
diff --git a/qtmips_machine/registers.h b/qtmips_machine/registers.h
index fa3e304..9bb8426 100644
--- a/qtmips_machine/registers.h
+++ b/qtmips_machine/registers.h
@@ -26,6 +26,8 @@ public:
     bool operator ==(const Registers &c) const;
     bool operator !=(const Registers &c) const;
 
+    void reset(); // Reset all values to zero (except pc)
+
 signals:
     void pc_update(std::uint32_t val);
     void gp_update(std::uint8_t i, std::uint32_t val);
-- 
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