[Add] software simulator add

CMakeLists.txt

@@ -13,6 +13,7 @@ if (${CMAKE_BUILD_TYPE} STREQUAL "Debug")
   add_compile_options(-D DEBUG_MODE)
 endif()
 
+include_directories(${CMAKE_SOURCE_DIR}/include)
 
 # ----- ----- 构建虚拟外设 ----- -----
 set(LABUS labus)

include/common.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <cstdlib>
+#include <cstdio>
+#include <ctime>
+#include <cstring>
+#include <fstream>
+
+#ifndef COMMON_H__
+#define COMMON_H__
+
+#ifdef DEBUG_MODE
+#define Log(fmt, ...) printf("[%s@%d %ld] " fmt "\n", __FILE__, __LINE__, clock(), ## __VA_ARGS__)
+
+#define panic(x) do {   \
+  Log(x);               \
+  exit(EXIT_FAILURE);   \
+} while (0)
+
+#define panicifnot(cond) do {   \
+    if (!(cond)) {              \
+        Log(#cond " fail");     \
+        exit(EXIT_FAILURE);     \
+    }                           \
+} while (0)
+
+#else
+
+#define Log(...)
+#define panic(x)
+#define panicifnot(cond)
+
+#endif
+
+#endif
+

include/devaddr.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#ifndef DEVADDR_H__
+#define DEVADDR_H__
+
+#define RAM_ADDR 0x0000'0000
+#define IMG_ADDR 0x0000'8000
+#define STK_ADDR 0x2000'0000
+
+#define DEVICE_BASE 0xa0000000
+#define MMIO_BASE 0xa0000000
+
+#define SERIAL_PORT     (DEVICE_BASE + 0x00003f8)
+#define KBD_ADDR        (DEVICE_BASE + 0x0000060)
+#define RTC_ADDR        (DEVICE_BASE + 0x0000048)
+#define VGACTL_ADDR     (DEVICE_BASE + 0x0000100)
+#define AUDIO_ADDR      (DEVICE_BASE + 0x0000200)
+#define DISK_ADDR       (DEVICE_BASE + 0x0000300)
+#define FB_ADDR         (MMIO_BASE   + 0x1000000)
+#define AUDIO_SBUF_ADDR (MMIO_BASE   + 0x1200000)
+
+#endif

labus/device.cc

@@ -0,0 +1 @@
+#include <device.hh>

labus/include/device.hh

@@ -0,0 +1,140 @@
+#pragma once
+
+#include <cstdint>
+#include <cstdlib>
+
+class Device {
+public:
+  Device() = default;
+
+  virtual const size_t &size() const = 0;
+
+  virtual void write(char *buf, size_t addr, size_t len) = 0;
+  virtual void read(char *buf, size_t addr, size_t len) = 0;
+
+  virtual void write64(uint64_t &dword, size_t addr) = 0;
+  virtual void read64(uint64_t &dword, size_t addr) = 0;
+
+  virtual void write32(uint32_t &word, size_t addr) = 0;
+  virtual void read32(uint32_t &word, size_t addr) = 0;
+
+  virtual void write16(uint16_t &hword, size_t addr) = 0;
+  virtual void read16(uint16_t &hword, size_t addr) = 0;
+
+  virtual void write8(uint8_t &byte, size_t addr) = 0;
+  virtual void read8(uint8_t &byte, size_t addr) = 0;
+
+  virtual ~Device() = default;
+};
+
+template <typename T>
+class WRDevice : public Device{
+  size_t devsiz;
+public:
+  WRDevice(size_t siz);
+
+  virtual const size_t &size() const;
+
+  virtual void write(char *buf, size_t addr, size_t len);
+  virtual void read(char *buf, size_t addr, size_t len);
+
+  virtual void write64(uint64_t &dword, size_t addr);
+  virtual void read64(uint64_t &dword, size_t addr);
+
+  virtual void write32(uint32_t &word, size_t addr);
+  virtual void read32(uint32_t &word, size_t addr);
+
+  virtual void write16(uint16_t &hword, size_t addr);
+  virtual void read16(uint16_t &hword, size_t addr);
+
+  virtual void write8(uint8_t &byte, size_t addr);
+  virtual void read8(uint8_t &byte, size_t addr);
+
+  virtual ~WRDevice() = default;
+};
+
+template <typename T>
+WRDevice<T>::WRDevice(size_t siz) : devsiz(siz) {}
+
+template <typename T>
+const size_t &WRDevice<T>::size() const { return devsiz; }
+
+template <typename T>
+void WRDevice<T>::write(char *buf, size_t addr, size_t len) {}
+
+template <typename T>
+void WRDevice<T>::read(char *buf, size_t addr, size_t len) {}
+
+template <typename T>
+void WRDevice<T>::write64(uint64_t &dword, size_t addr) {
+  uint8_t buf[sizeof(dword)];
+  buf[0] = (dword >>  0) & 0xFF;
+  buf[1] = (dword >>  8) & 0xFF;
+  buf[2] = (dword >> 16) & 0xFF;
+  buf[3] = (dword >> 24) & 0xFF;
+  buf[4] = (dword >> 32) & 0xFF;
+  buf[5] = (dword >> 40) & 0xFF;
+  buf[6] = (dword >> 48) & 0xFF;
+  buf[7] = (dword >> 56) & 0xFF;
+  static_cast<T *>(this)->write((char *)buf, addr, sizeof(dword));
+}
+
+template <typename T>
+void WRDevice<T>::read64(uint64_t &dword, size_t addr) {
+  uint8_t buf[sizeof(dword)];
+  static_cast<T *>(this)->read((char *)buf, addr, sizeof(dword));
+  dword =  (uint64_t) buf[0];
+  dword |= (uint64_t) buf[1] << 8;
+  dword |= (uint64_t) buf[2] << 16;
+  dword |= (uint64_t) buf[3] << 24;
+  dword |= (uint64_t) buf[4] << 32;
+  dword |= (uint64_t) buf[5] << 40;
+  dword |= (uint64_t) buf[6] << 48;
+  dword |= (uint64_t) buf[7] << 56;
+}
+
+template <typename T>
+void WRDevice<T>::write32(uint32_t &word, size_t addr) {
+  uint8_t buf[sizeof(word)];
+  buf[0] = (word >>  0) & 0xFF;
+  buf[1] = (word >>  8) & 0xFF;
+  buf[2] = (word >> 16) & 0xFF;
+  buf[3] = (word >> 24) & 0xFF;
+  static_cast<T *>(this)->write((char *)buf, addr, sizeof(word));
+}
+
+template <typename T>
+void WRDevice<T>::read32(uint32_t &word, size_t addr) {
+  uint8_t buf[sizeof(word)];
+  static_cast<T *>(this)->read((char *)buf, addr, sizeof(word));
+  word =  (uint32_t) buf[0];
+  word |= (uint32_t) buf[1] << 8;
+  word |= (uint32_t) buf[2] << 16;
+  word |= (uint32_t) buf[3] << 24;
+}
+
+template <typename T>
+void WRDevice<T>::write16(uint16_t &hword, size_t addr) {
+  uint8_t buf[sizeof(hword)];
+  buf[0] = (hword >>  0) & 0xFF;
+  buf[1] = (hword >>  8) & 0xFF;
+  static_cast<T *>(this)->write((char *)buf, addr, sizeof(hword));
+}
+
+template <typename T>
+void WRDevice<T>::read16(uint16_t &hword, size_t addr) {
+  uint8_t buf[sizeof(hword)];
+  static_cast<T *>(this)->read((char *)buf, addr, sizeof(hword));
+  hword =  (uint16_t) buf[0];
+  hword |= (uint16_t) buf[1] << 8;
+}
+
+template <typename T>
+void WRDevice<T>::write8(uint8_t &byte, size_t addr) {
+  static_cast<T *>(this)->write((char *)&byte, addr, sizeof(byte));
+}
+
+template <typename T>
+void WRDevice<T>::read8(uint8_t &byte, size_t addr) {
+  static_cast<T *>(this)->read((char *)&byte, addr, sizeof(byte));
+}

labus/include/memory.hh

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <device.hh>
+
+class Memory : public WRDevice<Memory> {
+  char *data;
+  bool wen;
+  bool ren;
+  bool xen;
+public:
+  Memory(size_t siz, bool w = true, bool r = true, bool x = true);
+  ~Memory();
+
+  void load(const char *path);
+  void load(Memory *mem, size_t addr, size_t len);
+
+  void write(char *buf, size_t addr, size_t len);
+  void read(char *buf, size_t addr, size_t len);
+};

labus/include/serial.hh

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <device.hh>
+
+class Serial : public WRDevice<Serial> {
+public:
+  Serial(size_t siz);
+
+  void write(char *buf, size_t addr, size_t len);
+};

labus/include/sysbus.hh

@@ -1 +1,33 @@
-int fetch();
+#pragma once
+
+#include <cstdint>
+#include <cstdlib>
+#include <map>
+
+#include <device.hh>
+
+class SystemBus {
+  std::map<uint64_t, Device *> iomap;
+
+  std::pair<const uint64_t, Device *> &finddev(uint64_t addr);
+
+public:
+  SystemBus() = default;
+
+  void regdev(Device *dev, uint64_t addr);
+
+  void write(char *buf, size_t addr, size_t len);
+  void read(char *buf, size_t addr, size_t len);
+
+  void write64(uint64_t &dword, size_t addr);
+  void read64(uint64_t &dword, size_t addr);
+
+  void write32(uint32_t &word, size_t addr);
+  void read32(uint32_t &word, size_t addr);
+
+  void write16(uint16_t &hword, size_t addr);
+  void read16(uint16_t &hword, size_t addr);
+
+  void write8(uint8_t &byte, size_t addr);
+  void read8(uint8_t &byte, size_t addr);
+};

labus/memory.cc

@@ -0,0 +1,40 @@
+#include <memory.hh>
+#include <common.h>
+
+Memory::Memory(size_t siz, bool w, bool r, bool x)
+    : WRDevice(siz), wen(w), ren(r), xen(x) {
+  data = new char[siz];
+  memset((void *)data, 0, siz);
+}
+
+Memory::~Memory() {
+  if (data) {
+    delete [] data;
+  }
+}
+
+void Memory::load(const char *path) {
+  std::fstream ifs(path, std::ios::in | std::ios::binary);
+  panicifnot(ifs);
+  ifs.read(data, this->size());
+  ifs.close();
+}
+
+void Memory::load(Memory *mem, size_t addr, size_t len) {
+  panicifnot(addr + len < this->size());
+  memcpy(&data[addr], mem->data, len);
+}
+
+void Memory::write(char *buf, size_t addr, size_t len) {
+  if (!wen)
+    panic("permission denied");
+  size_t actlen = addr + len >= this->size() ? this->size() - addr : len;
+  memcpy(&data[addr], buf, actlen);
+}
+
+void Memory::read(char *buf, size_t addr, size_t len) {
+  if (!ren)
+    panic("permission denied");
+  size_t actlen = addr + len >= this->size() ? this->size() - addr : len;
+  memcpy(buf, &data[addr], actlen);
+}

labus/serial.cc

@@ -0,0 +1,10 @@
+#include <serial.hh>
+#include <common.h>
+
+Serial::Serial(size_t siz) : WRDevice(siz) {}
+
+void Serial::write(char *buf, size_t addr, size_t len) {
+  for (size_t i = 0; i < len; ++i)
+    putc(buf[i], stdout);
+  fflush(stdout);
+}

labus/sysbus.cc

@@ -1,3 +1,66 @@
-int fetch() {
-    return 0;
+#include <sysbus.hh>
+#include <common.h>
+
+std::pair<const uint64_t, Device *> &SystemBus::finddev(uint64_t addr) {
+  Device *dev = nullptr;
+  auto &&iter = iomap.upper_bound(addr);
+  if (iter == iomap.begin())
+    panic("device not found");
+  iter--;
+  if (iter->first <= addr && iter->first + iter->second->size() > addr)
+    dev = iter->second;
+  panicifnot(dev);
+  return *iter;
+}
+
+void SystemBus::regdev(Device *dev, uint64_t addr) { iomap.emplace(addr, dev); }
+
+void SystemBus::write(char *buf, size_t addr, size_t len) {
+  auto &&dev = finddev(addr);
+  dev.second->write(buf, addr - dev.first, len);
+}
+
+void SystemBus::read(char *buf, size_t addr, size_t len) {
+  auto &&dev = finddev(addr);
+  dev.second->read(buf, addr - dev.first, len);
+}
+
+void SystemBus::write64(uint64_t &dword, size_t addr) {
+  auto &&dev = finddev(addr);
+  dev.second->write64(dword, addr - dev.first);
+}
+
+void SystemBus::read64(uint64_t &dword, size_t addr) {
+  auto &&dev = finddev(addr);
+  dev.second->read64(dword, addr - dev.first);
+}
+
+void SystemBus::write32(uint32_t &word, size_t addr) {
+  auto &&dev = finddev(addr);
+  dev.second->write32(word, addr - dev.first);
+}
+
+void SystemBus::read32(uint32_t &word, size_t addr) {
+  auto &&dev = finddev(addr);
+  dev.second->read32(word, addr - dev.first);
+}
+
+void SystemBus::write16(uint16_t &hword, size_t addr) {
+  auto &&dev = finddev(addr);
+  dev.second->write16(hword, addr - dev.first);
+}
+
+void SystemBus::read16(uint16_t &hword, size_t addr) {
+  auto &&dev = finddev(addr);
+  dev.second->read16(hword, addr - dev.first);
+}
+
+void SystemBus::write8(uint8_t &byte, size_t addr) {
+  auto &&dev = finddev(addr);
+  dev.second->write8(byte, addr - dev.first);
+}
+
+void SystemBus::read8(uint8_t &byte, size_t addr) {
+  auto &&dev = finddev(addr);
+  dev.second->read8(byte, addr - dev.first);
 }

lasim/include/la32r.hh

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <sysbus.hh>
+
+class LA32R {
+public:
+  LA32R(SystemBus *bus);
+  void Step(unsigned in);
+};

lasim/la32r.cc

@@ -0,0 +1,115 @@
+#include <common.h>
+#include <la32r.hh>
+
+namespace {
+using u64 = uint64_t;
+using i64 = int64_t;
+
+using u32 = uint32_t;
+using i32 = int32_t;
+
+SystemBus *sysbus;
+
+enum regenum {
+     R0,  R1,  R2,  R3,  R4,  R5,  R6,  R7,  R8,  R9,
+    R10, R11, R12, R13, R14, R15, R16, R17, R18, R19,
+    R20, R21, R22, R23, R24, R25, R26, R27, R28, R29,
+    R30, R31, PC
+};
+
+enum PLV {
+    PLV0, 
+    // PLV1, 
+    // PLV2, 
+    PLV3, 
+} PrivilegeLevel ;
+
+class Registers {
+private:
+    u32 regs_[32] = {0};
+    u32 pc_ = 0;
+
+public:
+    Registers() = default;
+
+    u32 get(u32 idx) {
+        panicifnot((0 <= idx && 32 >= idx) || idx == PC);
+        if (idx == PC) {
+            return pc_;
+        }
+
+        if (0 <= idx && 32 >= idx) {
+            return regs_[idx];
+        }
+
+        panic("Unexpected register access");
+    }
+
+    void set(u32 idx, u32 data) {
+        panicifnot((0 <= idx && 32 >= idx) || idx == PC);
+        if (idx == PC) {
+            pc_ = data;
+        }
+
+        if (0 <= idx && 32 >= idx) {
+            regs_[idx] = data;
+        }
+
+        panic("Unexpected register access");
+
+    }
+
+    u32 &operator[](u32 idx) {
+        if (idx == PC) {
+            return pc_;
+        }
+
+        if (0 <= idx && 32 >= idx) {
+            return regs_[idx];
+        }
+
+        panic("Unexpected register access");
+    }
+} Regs ;
+
+constexpr u32 getbits(u32 hi, u32 lo, u32 data) {
+    data = data >> lo;
+    u32 mask = ((u64) 0x1 << (hi + 1)) - 1;
+    return data & mask;
+}
+
+void decode_and_exec(u32 inst) {
+
+    if (getbits(31, 15, inst) == 0b00000000000100000) {
+        u32 rd = getbits( 4,  0, inst);
+        u32 rj = getbits( 9,  5, inst);
+        u32 rk = getbits(14, 10, inst);
+
+        u32 tmp = Regs[rj] + Regs[rk];
+        Regs[rd] = getbits(31, 0, tmp);
+        return;
+    }
+
+    panic("Invalid operation or have not implemented yet.");
+}
+
+u32 fetch() {
+    u32 inst;
+    sysbus->read32(inst, Regs[PC]);
+    return inst;
+}
+
+}
+
+
+LA32R::LA32R(SystemBus *bus) {
+    sysbus = bus;
+
+    Regs[PC] = 0x0000'0000;
+}
+
+void LA32R::Step(unsigned in) {
+    u32 inst = fetch();
+    decode_and_exec(inst);
+    Regs[PC] += 4;
+}

lasim/main.cc

@@ -1,11 +1,38 @@
-#include <sysbus.hh>
-
 #include <iostream>
 
-int main() {
-    fetch();
-#ifdef DEBUG_MODE
-    std::cout << "Hello" << std::endl;
-#endif
+#include <sysbus.hh>
+#include <memory.hh>
+#include <serial.hh>
+#include <la32r.hh>
+#include <common.h>
+#include <devaddr.h>
+
+int main(int argc, char *argv[]) {
+  if (argc < 2) {
+    std::cout << "Usage: sim <bin>";
     return 0;
+  }
+
+  SystemBus bus;
+  Memory ram(2 * 1024 * 1024);
+  Memory stk(256 * 1024);
+
+  Memory flash(1024 * 1024);
+  flash.load(argv[1]);
+  ram.load(&flash, IMG_ADDR, flash.size());
+
+  bus.regdev(&ram,  RAM_ADDR);
+  bus.regdev(&stk,  STK_ADDR);
+
+  Serial bios(1);
+  bus.regdev(&bios, SERIAL_PORT);
+
+  auto cpu = new LA32R(&bus);
+
+  while (true) {
+    cpu->Step(1);
+  }
+
+  delete cpu;
+  return 0;
 }