lo_mem 37 bsp/boot/x86/pc/startup.c extern paddr_t lo_mem; lo_mem 73 bsp/boot/x86/pc/startup.c bi->ram[1].base = lo_mem * 1024; lo_mem 74 bsp/boot/x86/pc/startup.c bi->ram[1].size = (size_t)((1024 - lo_mem) * 1024);