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| 1 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 // |
| 5 // Defines the BootloaderType class. This class wraps the kernel commandline |
| 6 // to determine the bootloader type. Our bootloaders are configured to boot |
| 7 // with identifying kernel command lines: |
| 8 // - EFI uses cros_efi |
| 9 // - Legacy uses cros_legacy |
| 10 // - Chrome OS uses cros_secure |
| 11 // - A debug override can use cros_debug. |
| 12 // This done by walking /proc/cmdline. |
| 13 // |
| 14 #ifndef CROS_BOOT_MODE_BOOTLOADER_TYPE_H_ |
| 15 #define CROS_BOOT_MODE_BOOTLOADER_TYPE_H_ |
| 16 |
| 17 #include <sys/types.h> |
| 18 |
| 19 #include "platform_reader.h" |
| 20 |
| 21 namespace cros_boot_mode { |
| 22 |
| 23 class BootloaderType : public PlatformReader { |
| 24 public: |
| 25 static const char *kBootloaderTypePath; |
| 26 enum { |
| 27 kChromeOS = 0, |
| 28 kEFI, |
| 29 kLegacy, |
| 30 kDebug, |
| 31 }; |
| 32 // API-exposed names |
| 33 static const char *kBootloaderTypeText[]; |
| 34 static const size_t kBootloaderTypeCount; |
| 35 // Maximum allowed /proc/cmdline size. |
| 36 static const int kMaxKernelCmdlineSize; |
| 37 // Functional names found in /proc/cmdline. |
| 38 static const char *kSupportedBootloaders[]; |
| 39 |
| 40 |
| 41 BootloaderType(); |
| 42 virtual ~BootloaderType(); |
| 43 |
| 44 // Process walks over the /proc/cmdline and converts it to the enum |
| 45 // above. The conversion is done by finding the first match in |
| 46 // kSupportedBootloaders and then emits the enum that corresponds to |
| 47 // the matching array index (or kUnsupported). |
| 48 virtual int Process(const char *contents, size_t length); |
| 49 virtual const char *name() const { |
| 50 return "bootloader_type"; |
| 51 } |
| 52 virtual const char *c_str() const { |
| 53 return (value() >= 0 ? kBootloaderTypeText[value()] : "unsupported"); |
| 54 } |
| 55 virtual const char *default_platform_file_path() const { |
| 56 return "/proc/cmdline"; |
| 57 } |
| 58 virtual size_t max_size() const { |
| 59 return kMaxKernelCmdlineSize; |
| 60 } |
| 61 }; |
| 62 |
| 63 } // namespace cros_boot_mode |
| 64 #endif // CROS_BOOT_MODE_BOOTLOADER_TYPE_H_ |
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