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Code Issues Releases Activity

boot2: work around pcv<->fs<->settings race condition

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This commit is contained in:
Michael Scire 2020-07-22 18:24:01 -07:00 committed by SciresM
parent eecf59dd00
commit 185baa7c4d
1 changed files with 40 additions and 7 deletions
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47
libraries/libstratosphere/source/boot2/boot2_api.cpp
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@ -183,14 +183,16 @@ namespace ams::boot2 {
return R_SUCCEEDED(gpioPadGetValue(&button, &val)) && val == GpioValue_Low;
}
bool IsForceMaintenance() {
u8 force_maintenance = 1;
settings::fwdbg::GetSettingsItemValue(&force_maintenance, sizeof(force_maintenance), "boot", "force_maintenance");
return force_maintenance != 0;
}
bool IsMaintenanceMode() {
/* Contact set:sys, retrieve boot!force_maintenance. */
{
u8 force_maintenance = 1;
settings::fwdbg::GetSettingsItemValue(&force_maintenance, sizeof(force_maintenance), "boot", "force_maintenance");
if (force_maintenance != 0) {
return true;
}
if (IsForceMaintenance()) {
return true;
}
/* Contact GPIO, read plus/minus buttons. */
@ -313,7 +315,38 @@ namespace ams::boot2 {
R_ABORT_UNLESS(sm::mitm::WaitMitm(sm::ServiceName::Encode("fsp-srv")));
/* Launch programs required to mount the SD card. */
LaunchList(PreSdCardLaunchPrograms, NumPreSdCardLaunchPrograms);
/* psc, bus, pcv (and usb on newer firmwares) is the minimal set of required programs. */
/* bus depends on pcie, and pcv depends on settings. */
{
/* Launch psc. */
LaunchProgram(nullptr, ncm::ProgramLocation::Make(ncm::SystemProgramId::Psc, ncm::StorageId::BuiltInSystem), 0);
/* Launch pcie. */
LaunchProgram(nullptr, ncm::ProgramLocation::Make(ncm::SystemProgramId::Pcie, ncm::StorageId::BuiltInSystem), 0);
/* Launch bus. */
LaunchProgram(nullptr, ncm::ProgramLocation::Make(ncm::SystemProgramId::Bus, ncm::StorageId::BuiltInSystem), 0);
/* Launch settings. */
LaunchProgram(nullptr, ncm::ProgramLocation::Make(ncm::SystemProgramId::Settings, ncm::StorageId::BuiltInSystem), 0);
/* NOTE: Here we work around a race condition in the boot process by ensuring that settings initializes its db. */
{
/* Connect to set:sys. */
sm::ScopedServiceHolder<::setsysInitialize, ::setsysExit> setsys_holder;
AMS_ABORT_UNLESS(setsys_holder);
/* Retrieve setting from the database. */
u8 force_maintenance = 0;
settings::fwdbg::GetSettingsItemValue(&force_maintenance, sizeof(force_maintenance), "boot", "force_maintenance");
}
/* Launch pcv. */
LaunchProgram(nullptr, ncm::ProgramLocation::Make(ncm::SystemProgramId::Pcv, ncm::StorageId::BuiltInSystem), 0);
/* Launch usb. */
LaunchProgram(nullptr, ncm::ProgramLocation::Make(ncm::SystemProgramId::Usb, ncm::StorageId::BuiltInSystem), 0);
}
/* Wait for the SD card required services to be ready. */
cfg::WaitSdCardRequiredServicesReady();