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Commit b885e4ad authored by Tiffany Yang's avatar Tiffany Yang
Browse files

init: Wait for /dev/hvc1 during ARCVM first-stage mount 

This commit introduces a function to allow ARC-specific logic during
first-stage mount by checking for the existence of an indicator file
at the path "/is_arcvm".

ARC uses the virtio-console device `hvc1` to pass byte data to Android
before second-stage init. Ensure that /dev/hvc1 is initialized before
ARCVM continues booting, but allow other devices to bypass this device
initialization.

Bug: 325538592
Test: boot ARC, ensure /dev/hvc1 can be read during PropertyInit
Change-Id: Ic258b7b004b59da462f4990131a5c11fc94eca62
parent 0fb39f6e

init/first_stage_mount.cpp

+5 −0
Original line number Diff line number Diff line
@@ -305,6 +305,11 @@ bool FirstStageMountVBootV2::InitDevices() { 
            return false;

        }

    }



    if (IsArcvm() && !block_dev_init_.InitHvcDevice("hvc1")) {

        return false;

    }



    return true;

}

init/selinux.cpp

+2 −0
Original line number Diff line number Diff line
@@ -474,6 +474,8 @@ void SelinuxRestoreContext() { 
    RestoreconIfExists(SnapshotManager::GetGlobalRollbackIndicatorPath().c_str(), 0);

    RestoreconIfExists("/metadata/gsi",

                       SELINUX_ANDROID_RESTORECON_RECURSE | SELINUX_ANDROID_RESTORECON_SKIP_SEHASH);



    RestoreconIfExists("/dev/hvc1", 0);

}



int SelinuxKlogCallback(int type, const char* fmt, ...) {

init/util.h

+5 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 


#include <sys/stat.h>

#include <sys/types.h>

#include <sys/unistd.h>



#include <chrono>

#include <functional>
@@ -108,6 +109,10 @@ inline constexpr bool IsMicrodroid() { 
#endif

}



inline bool IsArcvm() {

    return !access("/is_arcvm", F_OK);

}



bool Has32BitAbi();



std::string GetApexNameFromFileName(const std::string& path);