mem.hpp

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#pragma once
 
#include <vector>
#include <cstdint>
#include <cstddef>
#include <memory>
 
// ===================================
// 设备地址映射 (MMIO Configuration)
// ===================================
constexpr size_t DEVICE_BASE = 0xa0000000;
constexpr size_t MMIO_BASE   = 0xa0000000;
 
constexpr size_t SERIAL_PORT     = DEVICE_BASE + 0x00003f8;
constexpr size_t KBD_ADDR        = DEVICE_BASE + 0x0000060;
constexpr size_t RTC_ADDR        = DEVICE_BASE + 0x0000048;
constexpr size_t VGACTL_ADDR     = DEVICE_BASE + 0x0000100;
constexpr size_t AUDIO_ADDR      = DEVICE_BASE + 0x0000200;
constexpr size_t DISK_ADDR       = DEVICE_BASE + 0x0000300;
constexpr size_t FB_ADDR         = MMIO_BASE   + 0x1000000;
constexpr size_t AUDIO_SBUF_ADDR = MMIO_BASE   + 0x1200000;

class guest_mem {
private:
    std::vector<uint8_t> mem;  
    size_t base_addr;          
    size_t size;               
    // 统一地址读写接口 (隔离层)
    uint64_t paddr_read(size_t addr, int len);
    void paddr_write(size_t addr, int len, uint64_t data);
 
    // 内部 PMEM/MMIO 读写接口
    uint64_t pmem_read(size_t addr, int len);
    void pmem_write(size_t addr, int len, uint64_t data);
    uint64_t mmio_read(size_t addr, int len);
    void mmio_write(size_t addr, int len, uint64_t data);
public:
    guest_mem(size_t base = 0x80000000, size_t sz = 128 * 1024 * 1024);
 
    // 析构函数
    ~guest_mem() = default;

    inline bool in_pmem(size_t addr) const {
        return addr >= base_addr && addr < base_addr + size;
    }

    inline bool in_mmio(size_t addr) const {
        return addr >= MMIO_BASE && addr < MMIO_BASE + 0x2000000;
    }
    
    inline bool in_bounds(size_t addr) const {
        return in_pmem(addr) || in_mmio(addr);
    }

    uint8_t* get_host_ptr(size_t addr);

    void load_binary(size_t load_addr, const void* ext_mem, size_t ext_size);
 
    // ===================================
    // 面向外部 (Core 等) 暴露的标准接口
    // ===================================
    // 面向外部 (Core 等) 暴露的标准接口读写函数
    // 包含有符号和无符号的 Byte, Half-Word, Word 和 Double-Word 的加载和存储
 
    int8_t   lb(size_t addr);  
    uint8_t  lbu(size_t addr); 
    int16_t  lh(size_t addr);  
    uint16_t lhu(size_t addr); 
    int32_t  lw(size_t addr);  
    uint32_t lwu(size_t addr); 
    int64_t  ld(size_t addr);  
 
    void     sb(size_t addr, uint8_t val);  
    void     sh(size_t addr, uint16_t val); 
    void     sw(size_t addr, uint32_t val); 
    void     sd(size_t addr, uint64_t val); 

    uint8_t  read_byte(size_t addr);

    void     write_byte(size_t addr, uint8_t val);

    void     mem_init();
}; // 类定义结束