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grub_err_tgrub_linux_boot (void){	struct linux_kernel_params *params;	int e820_num;		params = real_mode_mem;		/* 获取内存分布 */	int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size, 			     grub_memory_type_t type)    {      switch (type)        {        case GRUB_MEMORY_AVAILABLE:	  grub_e820_add_region (params->e820_map, &e820_num,				addr, size, GRUB_E820_RAM);	  break;        case GRUB_MEMORY_ACPI:	  grub_e820_add_region (params->e820_map, &e820_num,				addr, size, GRUB_E820_ACPI);	  break;        case GRUB_MEMORY_NVS:	  grub_e820_add_region (params->e820_map, &e820_num,				addr, size, GRUB_E820_NVS);	  break;        case GRUB_MEMORY_BADRAM:	  grub_e820_add_region (params->e820_map, &e820_num,				addr, size, GRUB_E820_BADRAM);	  break;        default:          grub_e820_add_region (params->e820_map, &e820_num,                                addr, size, GRUB_E820_RESERVED);        }      return 0;    }	e820_num = 0;	grub_mmap_iterate (hook);	params->mmap_size = e820_num;		/* 跳转 */	state.ebp = state.edi = state.ebx = 0;	state.esi = real_mode_target;	state.esp = real_mode_target;	state.eip = params->code32_start;	return grub_relocator32_boot (relocator, state);}

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