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[FREELDR]

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- Simplify the implementation of the 'DiskGetBootPath' function;
- Cache the retrived freeldr boot path (corresponding to a given 'FrldrBootDrive' number);
- Introduce a 'DiskIsCdRomDrive' function to attempt to fix CORE-12692 .

svn path=/trunk/; revision=73621
This commit is contained in:
Hermès Bélusca-Maïto 2017-01-29 15:43:12 +00:00
parent 841f48d8f2
commit ff5f825f59
3 changed files with 145 additions and 67 deletions
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109
reactos/boot/freeldr/freeldr/arch/i386/pcdisk.c
View file

@ -17,6 +17,8 @@
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
// #if defined(__i386__) || defined(_M_AMD64)
#include <freeldr.h>
#define NDEBUG
@ -25,6 +27,7 @@
DBG_DEFAULT_CHANNEL(DISK);
#include <pshpack2.h>
typedef struct
{
UCHAR PacketSize; // 00h - Size of packet (10h or 18h)
@ -38,6 +41,38 @@ typedef struct
// Commented since some earlier BIOSes refuse to work with
// such extended structure
} I386_DISK_ADDRESS_PACKET, *PI386_DISK_ADDRESS_PACKET;
typedef struct
{
UCHAR PacketSize; // 00h - Size of packet in bytes (13h)
UCHAR MediaType; // 01h - Boot media type (see #00282)
UCHAR DriveNumber; /* 02h - Drive number:
* 00h Floppy image
* 80h Bootable hard disk
* 81h-FFh Nonbootable or no emulation
*/
UCHAR Controller; // 03h - CD-ROM controller number
ULONG LBAImage; // 04h - Logical Block Address of disk image to emulate
USHORT DeviceSpec; /* 08h - Device specification (see also #00282)
* (IDE) Bit 0:
* Drive is slave instead of master
* (SCSI) Bits 7-0:
* LUN and PUN
* Bits 15-8:
* Bus number
*/
USHORT Buffer; // 0Ah - Segment of 3K buffer for caching CD-ROM reads
USHORT LoadSeg; // 0Ch - Load segment for initial boot image.
// If 0000h, load at segment 07C0h.
USHORT SectorCount; // 0Eh - Number of 512-byte virtual sectors to load
// (only valid for AH=4Ch).
UCHAR CHSGeometry[3]; /* 10h - Low byte of cylinder count (for INT 13/AH=08h)
* 11h - Sector count, high bits of cylinder count (for INT 13/AH=08h)
* 12h - Head count (for INT 13/AH=08h)
*/
UCHAR Reserved;
} I386_CDROM_SPEC_PACKET, *PI386_CDROM_SPEC_PACKET;
#include <poppack.h>
/* FUNCTIONS *****************************************************************/
@ -540,6 +575,69 @@ PcDiskGetCacheableBlockCount(UCHAR DriveNumber)
}
}
static BOOLEAN
FallbackDiskIsCdRomDrive(UCHAR DriveNumber)
{
MASTER_BOOT_RECORD MasterBootRecord;
TRACE("FallbackDiskIsCdRomDrive(0x%x)\n", DriveNumber);
/* CD-ROM drive numbers are always > 0x80 */
if (DriveNumber <= 0x80)
return FALSE;
/*
* We suppose that a CD-ROM does not have a MBR
* (not always true: example of the Hybrid USB-ISOs).
*/
return !DiskReadBootRecord(DriveNumber, 0, &MasterBootRecord);
}
BOOLEAN DiskIsCdRomDrive(UCHAR DriveNumber)
{
REGS RegsIn, RegsOut;
PI386_CDROM_SPEC_PACKET Packet = (PI386_CDROM_SPEC_PACKET)(BIOSCALLBUFFER);
TRACE("DiskIsCdRomDrive(0x%x)\n", DriveNumber);
/* CD-ROM drive numbers are always > 0x80 */
if (DriveNumber <= 0x80)
return FALSE;
/* Setup disk address packet */
RtlZeroMemory(Packet, sizeof(*Packet));
Packet->PacketSize = sizeof(*Packet);
/*
* BIOS Int 13h, function 4B01h - Bootable CD-ROM - Get Disk Emulation Status
* AX = 4B01h
* DL = drive number
* DS:SI -> empty specification packet
* Return:
* CF clear if successful
* CF set on error
* AX = return codes
* DS:SI specification packet filled
*/
RegsIn.w.ax = 0x4B01;
RegsIn.b.dl = DriveNumber;
RegsIn.x.ds = BIOSCALLBUFSEGMENT; // DS:SI -> specification packet
RegsIn.w.si = BIOSCALLBUFOFFSET;
Int386(0x13, &RegsIn, &RegsOut);
// return (INT386_SUCCESS(RegsOut) && (Packet->DriveNumber == DriveNumber));
/*
* If the simple test failed, try to use the fallback code,
* but we can be on *very* thin ice.
*/
if (!INT386_SUCCESS(RegsOut) || (Packet->DriveNumber != DriveNumber))
return FallbackDiskIsCdRomDrive(DriveNumber);
else
return TRUE;
}
BOOLEAN
PcDiskGetBootPath(OUT PCHAR BootPath, IN ULONG Size)
{
@ -550,6 +648,17 @@ PcDiskGetBootPath(OUT PCHAR BootPath, IN ULONG Size)
// we were booting from network (and: PC --> PXE, etc...)
// and if so, set the correct ARC path. But then this new
// logic could be moved back to DiskGetBootPath...
if (*FrldrBootPath)
{
/* Copy back the buffer */
if (Size < strlen(FrldrBootPath) + 1)
return FALSE;
strncpy(BootPath, FrldrBootPath, Size);
return TRUE;
}
// FIXME! FIXME! Do this in some drive recognition procedure!!!!
if (PxeInit())
{
strcpy(BootPath, "net(0)");

88
reactos/boot/freeldr/freeldr/disk/disk.c
View file

@ -25,6 +25,8 @@
DBG_DEFAULT_CHANNEL(DISK);
CHAR FrldrBootPath[MAX_PATH] = "";
static BOOLEAN bReportError = TRUE;
/* FUNCTIONS *****************************************************************/
@ -98,93 +100,55 @@ BOOLEAN DiskIsDriveRemovable(UCHAR DriveNumber)
return TRUE;
}
BOOLEAN
DiskGetBootPath(OUT PCHAR BootPath, IN ULONG Size)
extern BOOLEAN
DiskIsCdRomDrive(UCHAR DriveNumber);
BOOLEAN DiskGetBootPath(OUT PCHAR BootPath, IN ULONG Size)
{
static char Path[] = "multi(0)disk(0)";
char Device[4];
MASTER_BOOT_RECORD MasterBootRecord;
if (*FrldrBootPath)
goto Done;
/* 0x49 is our magic ramdisk drive, so try to detect it first */
if (FrldrBootDrive == 0x49)
{
/* This is the ramdisk. See ArmDiskGetBootPath too... */
PCCH RamDiskPath = "ramdisk(0)";
if (Size < sizeof(RamDiskPath))
{
return FALSE;
}
strcpy(BootPath, RamDiskPath);
// sprintf(FrldrBootPath, "ramdisk(%u)", 0);
strcpy(FrldrBootPath, "ramdisk(0)");
}
else if (FrldrBootDrive < 0x80)
{
/* This is a floppy */
if (Size <= sizeof(Path) + 7 + sizeof(Device))
{
return FALSE;
}
strcpy(BootPath, Path);
_itoa(FrldrBootDrive, Device, 10);
strcat(BootPath, "fdisk(");
strcat(BootPath, Device);
strcat(BootPath, ")");
sprintf(FrldrBootPath, "multi(0)disk(0)fdisk(%u)", FrldrBootDrive);
}
/* FIXME */
else if (DiskReadBootRecord(FrldrBootDrive, 0, &MasterBootRecord))
else if (DiskIsCdRomDrive(FrldrBootDrive))
{
/* This is a CD-ROM drive */
sprintf(FrldrBootPath, "multi(0)disk(0)cdrom(%u)", FrldrBootDrive - 0x80);
}
else
{
ULONG BootPartition;
PARTITION_TABLE_ENTRY PartitionEntry;
char Partition[4];
/* This is a hard disk */
if (!DiskGetActivePartitionEntry(FrldrBootDrive, &PartitionEntry, &BootPartition))
{
DbgPrint("Invalid active partition information\n");
ERR("Invalid active partition information\n");
return FALSE;
}
FrldrBootPartition = BootPartition;
if (Size <= sizeof(Path) + 18 + sizeof(Device) + sizeof(Partition))
{
return FALSE;
}
strcpy(BootPath, Path);
_itoa(FrldrBootDrive - 0x80, Device, 10);
strcat(BootPath, "rdisk(");
strcat(BootPath, Device);
strcat(BootPath, ")");
_itoa(FrldrBootPartition, Partition, 10);
strcat(BootPath, "partition(");
strcat(BootPath, Partition);
strcat(BootPath, ")");
}
else
{
/* This is a CD-ROM drive */
if (Size <= sizeof(Path) + 7 + sizeof(Device))
{
return FALSE;
}
strcpy(BootPath, Path);
_itoa(FrldrBootDrive - 0x80, Device, 10);
strcat(BootPath, "cdrom(");
strcat(BootPath, Device);
strcat(BootPath, ")");
sprintf(FrldrBootPath, "multi(0)disk(0)rdisk(%u)partition(%lu)",
FrldrBootDrive - 0x80, FrldrBootPartition);
}
Done:
/* Copy back the buffer */
if (Size < strlen(FrldrBootPath) + 1)
return FALSE;
strncpy(BootPath, FrldrBootPath, Size);
return TRUE;
}

15
reactos/boot/freeldr/freeldr/include/disk.h
View file

@ -121,16 +121,21 @@ VOID DiskStopFloppyMotor(VOID);
// FreeLoader Disk Functions
//
///////////////////////////////////////////////////////////////////////////////////////
VOID DiskReportError (BOOLEAN bError);
VOID DiskReportError(BOOLEAN bError);
VOID DiskError(PCSTR ErrorString, ULONG ErrorCode);
PCSTR DiskGetErrorCodeString(ULONG ErrorCode);
BOOLEAN DiskIsDriveRemovable(UCHAR DriveNumber);
extern UCHAR FrldrBootDrive;
extern ULONG FrldrBootPartition;
extern PVOID DiskReadBuffer;
extern SIZE_T DiskReadBufferSize;
BOOLEAN DiskGetBootPath(OUT PCHAR BootPath, IN ULONG Size);
/* Platform-specific boot drive and partition numbers */
extern UCHAR FrldrBootDrive;
extern ULONG FrldrBootPartition;
/* ARC path of the boot drive and partition */
extern CHAR FrldrBootPath[MAX_PATH];
/* Buffer for disk reads */
extern PVOID DiskReadBuffer;
extern SIZE_T DiskReadBufferSize;
///////////////////////////////////////////////////////////////////////////////////////