diff options
Diffstat (limited to 'firmware/lib/vboot_ui.c')
| -rw-r--r-- | firmware/lib/vboot_ui.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/firmware/lib/vboot_ui.c b/firmware/lib/vboot_ui.c index 4739cd64..d4691157 100644 --- a/firmware/lib/vboot_ui.c +++ b/firmware/lib/vboot_ui.c @@ -153,6 +153,103 @@ int VbUserConfirms(struct vb2_context *ctx, VbCommonParams *cparams, return -1; } +VbError_t vb2_alt_os_picker(struct vb2_context *ctx, VbCommonParams *cparams, + uint32_t timeout_msec, int *index) +{ + /* Calibrate delay */ + uint64_t a, b; + a = VbExGetTimer(); + VbExSleepMs(10); + b = VbExGetTimer(); + uint64_t ticks_per_msec = (b - a) / 10ULL ; + uint64_t show_until = VbExGetTimer() + timeout_msec * ticks_per_msec; + + VB2_DEBUG("Alt OS picker: timeout_msec=%d\n", timeout_msec); + VB2_DEBUG("Alt OS picker: ticks_per_msec=%" PRIu64 "\n", + ticks_per_msec); + + *index = 0; + while (1) { + VbDisplayMenu(ctx, cparams, VB_SCREEN_ALT_OS, 0, *index); + if (VbWantShutdown(cparams->gbb->flags)) + return VBERROR_SHUTDOWN_REQUESTED; + uint32_t key = VbExKeyboardRead(); + if (key == VB_KEY_LEFT) + *index = 0; + else if (key == VB_KEY_RIGHT) + *index = 1; + else if (key == '\r' || key == ' ') + break; + VbExSleepMs(20); + + if (timeout_msec > 0 && VbExGetTimer() > show_until) { + VB2_DEBUG("Alt OS picker: timed out\n"); + break; + } + } + return VBERROR_SUCCESS; +} + +VbError_t vb2_alt_os_ui(struct vb2_context *ctx, VbCommonParams *cparams) +{ + /* Note that OPROM will not be disabled until the next reboot. */ + const int picker_timeout_msec = 20 * 1000; + VbSharedDataHeader *shared = + (VbSharedDataHeader *)cparams->shared_data_blob; + int boot_alt_os = 0; /* 0 = Chrome OS; 1 = Alt OS */ + uint8_t tpm_flags; + + /* Confirm enabling Alt OS */ + if (shared->flags & VBSD_ALT_OS_CONFIRM_ENABLE) { + VB2_DEBUG("Alt OS UI: Picker screen without timeout\n"); + VbError_t ret = vb2_alt_os_picker(ctx, cparams, + 0, &boot_alt_os); + if (ret != VBERROR_SUCCESS) { + VB2_DEBUG("Error from Alt OS picker screen\n"); + return ret; + } + } + + /* Enable if Alt OS is chosen */ + if (boot_alt_os) { + if (GetAltOSFlags(&tpm_flags)) { + VB2_DEBUG("Unable to read Alt OS flags from TPM\n"); + return VBERROR_TPM_ALT_OS; + } + tpm_flags |= ALT_OS_ENABLE; + if (SetAltOSFlags(tpm_flags)) { + VB2_DEBUG("Unable to write Alt OS flags to TPM\n"); + return VBERROR_TPM_ALT_OS; + } + } + + /* Show Alt OS picker screen */ + else if (shared->flags & VBSD_ALT_OS_SHOW_PICKER) { + VB2_DEBUG("Alt OS UI: Picker screen with timeout\n"); + VbError_t ret = vb2_alt_os_picker(ctx, cparams, + picker_timeout_msec, + &boot_alt_os); + if (ret != VBERROR_SUCCESS) { + VB2_DEBUG("Error from Alt OS picker screen\n"); + return ret; + } + } + + if (boot_alt_os) { + /* Will only return on failure */ + VbTryLegacy(ctx, 1); + } + + /* Will only return on failure */ + return VbBootNormal(ctx, cparams); +} + +VbError_t VbBootAltOS(struct vb2_context *ctx, VbCommonParams *cparams) +{ + VbError_t retval = vb2_alt_os_ui(ctx, cparams); + return retval; +} + static const char dev_disable_msg[] = "Developer mode is disabled on this device by system policy.\n" "For more information, see http://dev.chromium.org/chromium-os/fwmp\n" |