kernel cmdline
從 lk 傳送到 kerel 的 cmdline 會放在開機後的
adb
/proc/cmdline
開到 android 後,又會被讀出來
/system/core/init/util.cpp
275void import_kernel_cmdline(bool in_qemu,
276 const std::function<void(const std::string&, const std::string&, bool)>& fn) {
277 std::string cmdline;
278 android::base::ReadFileToString("/proc/cmdline", &cmdline);
279
280 for (const auto& entry : android::base::Split(android::base::Trim(cmdline), " ")) {
281 std::vector<std::string> pieces = android::base::Split(entry, "=");
282 if (pieces.size() == 2) {
283 fn(pieces[0], pieces[1], in_qemu);
284 }
285 }
286}
/system/core/init/init.cpp
391static void import_kernel_nv(const std::string& key, const std::string& value, bool for_emulator) {
392 if (key.empty()) return;
393
394 if (for_emulator) {
395 // In the emulator, export any kernel option with the "ro.kernel." prefix.
396 property_set(android::base::StringPrintf("ro.kernel.%s", key.c_str()).c_str(), value.c_str());
397 return;
398 }
399
400 if (key == "qemu") {
401 strlcpy(qemu, value.c_str(), sizeof(qemu));
402 } else if (android::base::StartsWith(key, "androidboot.")) {
403 property_set(android::base::StringPrintf("ro.boot.%s", key.c_str() + 12).c_str(),
404 value.c_str());
405 }
406}