/**
 * PROJECT:         ExectOS
 * COPYRIGHT:       See COPYING.md in the top level directory
 * FILE:            xtldr/xtldr.c
 * DESCRIPTION:     XTOS UEFI Boot Loader
 * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
 */

#include <xtldr.h>


XTCDECL
VOID
BlDisplayBootMenu();

/**
 * Initializes a list of operating systems for XTLDR boot menu.
 *
 * @param MenuEntries
 *        Supplies a pointer to memory area where operating systems list will be stored.
 *
 * @param EntriesCount
 *        Supplies a pointer to memory area where number of menu entries will be stored.
 *
 * @param DefaultId
 *        Supplies a pointer to memory area where ID of default menu entry will be stored.
 *
 * @return This routine does not return any value.
 *
 * @since XT 1.0
 */
XTCDECL
VOID
BlInitializeBootMenuList(OUT PXTBL_BOOTMENU_ITEM MenuEntries,
                         OUT PULONG EntriesCount,
                         OUT PULONG DefaultId)
{
    PWCHAR DefaultMenuEntry, MenuEntryName;
    PLIST_ENTRY MenuEntrySectionList, MenuEntryList;
    PXTBL_CONFIG_SECTION MenuEntrySection;
    PXTBL_CONFIG_ENTRY MenuEntryOption;
    PXTBL_BOOTMENU_ITEM OsList;
    ULONG DefaultOS, NumberOfEntries;

    /* Set default values */
    DefaultOS = 0;
    NumberOfEntries = 0;
    OsList = NULL;

    /* Get default menu entry from configuration */
    DefaultMenuEntry = BlGetConfigValue(L"DEFAULT");

    /* Iterate through all menu sections */
    MenuEntrySectionList = BlpMenuList->Flink;
    while(MenuEntrySectionList != BlpMenuList)
    {
        /* NULLify menu entry name */
        MenuEntryName = NULL;

        /* Get menu section */
        MenuEntrySection = CONTAIN_RECORD(MenuEntrySectionList, XTBL_CONFIG_SECTION, Flink);

        /* Check if this is the default menu entry */
        if(RtlCompareWideStringInsensitive(MenuEntrySection->SectionName, DefaultMenuEntry, 0) == 0)
        {
            /* Set default OS ID */
            DefaultOS = NumberOfEntries;
        }

        /* Iterate through all entry parameters */
        MenuEntryList = MenuEntrySection->Options.Flink;
        while(MenuEntryList != &MenuEntrySection->Options)
        {
            /* Get menu entry parameter */
            MenuEntryOption = CONTAIN_RECORD(MenuEntryList, XTBL_CONFIG_ENTRY, Flink);

            /* Check if this is the menu entry display name */
            if(RtlCompareWideStringInsensitive(MenuEntryOption->Name, L"SYSTEMNAME", 0) == 0)
            {
                /* Set menu entry display name */
                MenuEntryName = MenuEntryOption->Value;
            }

            /* Get next parameter for this menu entry */
            MenuEntryList = MenuEntryList->Flink;
        }

        /* Add OS to the boot menu list */
        OsList[NumberOfEntries].EntryName = MenuEntryName;
        OsList[NumberOfEntries].Options = &MenuEntrySection->Options;

        /* Get next menu entry */
        MenuEntrySectionList = MenuEntrySectionList->Flink;
        NumberOfEntries++;
    }

    /* Set return values */
    *DefaultId = DefaultOS;
    *EntriesCount = NumberOfEntries;
    MenuEntries = OsList;
}

/**
 * This routine is the entry point of the XT EFI boot loader.
 *
 * @param ImageHandle
 *        Firmware-allocated handle that identifies the image.
 *
 * @param SystemTable
 *        Provides the EFI system table.
 *
 * @return This routine returns status code.
 *
 * @since XT 1.0
 */
XTCDECL
EFI_STATUS
BlStartXtLoader(IN EFI_HANDLE ImageHandle,
                IN PEFI_SYSTEM_TABLE SystemTable)
{
    EFI_STATUS Status;

    /* Set the system table and image handle */
    EfiImageHandle = ImageHandle;
    EfiSystemTable = SystemTable;

    /* Initialize XTLDR and */
    BlpInitializeEfiBootLoader();

    /* Parse configuration options passed from UEFI shell */
    Status = BlpParseCommandLine();
    if(Status != STATUS_EFI_SUCCESS)
    {
        /* Failed to parse command line options */
        BlDisplayErrorDialog(L"XTLDR", L"Failed to parse command line parameters.");
    }

    /* Attempt to early initialize debug console */
    if(DEBUG)
    {
        Status = BlpInitializeDebugConsole();
        if(Status != STATUS_EFI_SUCCESS)
        {
            /* Initialization failed, notify user on stdout */
            BlDisplayErrorDialog(L"XTLDR", L"Failed to initialize debug console.");
        }
    }

    /* Load XTLDR configuration file */
    Status = BlpLoadConfiguration();
    if(Status != STATUS_EFI_SUCCESS)
    {
        /* Failed to load/parse config file */
        BlDisplayErrorDialog(L"XTLDR", L"Failed to load and parse configuration file.");
    }

    /* Reinitialize debug console if it was not initialized earlier */
    if(DEBUG)
    {
        Status = BlpInitializeDebugConsole();
        if(Status != STATUS_EFI_SUCCESS)
        {
            /* Initialization failed, notify user on stdout */
            BlDisplayErrorDialog(L"XTLDR", L"Failed to initialize debug console.");
        }
    }

    /* Disable watchdog timer */
    Status = EfiSystemTable->BootServices->SetWatchdogTimer(0, 0x10000, 0, NULL);
    if(Status != STATUS_EFI_SUCCESS)
    {
        /* Failed to disable the timer, print message */
        BlDebugPrint(L"WARNING: Failed to disable watchdog timer\n");
    }

    /* Register loader protocol */
    Status = BlpRegisterXtLoaderProtocol();
    if(Status != STATUS_EFI_SUCCESS)
    {
        /* Failed to register loader protocol */
        BlDebugPrint(L"ERROR: Failed to register XTLDR boot protocol\n");
    }

    /* Discover and enumerate EFI block devices */
    Status = BlEnumerateBlockDevices();
    if(Status != STATUS_EFI_SUCCESS)
    {
        /* Failed to enumerate block devices */
        BlDebugPrint(L"ERROR: Failed to discover and enumerate block devices\n");
    }

    for(;;)
    {
        if(BlpStatus.BootMenu != NULL)
        {
            /* Display alternative boot menu */
            BlpStatus.BootMenu();
        }
        else
        {
            /* Display default boot menu */
            BlDisplayBootMenu();
        }
    }

    /* This point should be never reached, if this happen return error code */
    return STATUS_EFI_LOAD_ERROR;
}