qemu tcg mmp分析

864 /* NOTE: this function can trigger an exception */
 865 /* NOTE2: the returned address is not exactly the physical address: it
 866  * is actually a ram_addr_t (in system mode; the user mode emulation
 867  * version of this function returns a guest virtual address).
 868  */
 869 tb_page_addr_t get_page_addr_code(CPUArchState *env, target_ulong addr)
 870 {
 871     int mmu_idx, index, pd;
 872     void *p;
 873     MemoryRegion *mr;
 874     CPUState *cpu = ENV_GET_CPU(env);
 875     CPUIOTLBEntry *iotlbentry;
 876     hwaddr physaddr;
 877
 878     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 879     mmu_idx = cpu_mmu_index(env, true);
 880     if (unlikely(env->tlb_table[mmu_idx][index].addr_code !=
 881                  (addr &a