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Maurice Ma
113 lines
3.7 KiB
C
113 lines
3.7 KiB
C
/** @file
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Routines supporting partition discovery
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Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <PiPei.h>
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#include <Library/PartitionLib.h>
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#include <Library/MediaAccessLib.h>
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#include <Library/BootloaderCommonLib.h>
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#include <Library/DebugLib.h>
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#include <Guid/FlashMapInfoGuid.h>
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/**
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This function adds a Flash region as partition.
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@param[in,out] PartBlockDev Parition block device pointer
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@param[in] RegionBase Flash region base address
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@param[in] RegionSize Flash region size
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**/
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VOID
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AddSpiPartition (
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IN OUT PART_BLOCK_DEVICE *PartBlockDev,
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IN UINT32 RegionBase,
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IN UINT32 RegionSize
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)
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{
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UINT32 BlockNum;
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LOGICAL_BLOCK_DEVICE *BlockDev;
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UINT32 BlkSize;
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BlockDev = &PartBlockDev->BlockDevice[PartBlockDev->BlockDeviceCount];
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DEBUG ((DEBUG_INFO, "Part %02d: ", PartBlockDev->BlockDeviceCount));
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if (RegionSize == 0) {
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// Use 0xFFFFFFFF in StartBlock to indicate it is not a valid software partition.
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BlockDev->StartBlock = 0xFFFFFFFF;
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BlockDev->LastBlock = 0;
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DEBUG ((DEBUG_INFO, "Partition size is 0, no data in this partition\n"));
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} else {
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BlkSize = PartBlockDev->BlockInfo.BlockSize;
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BlockNum = ((RegionSize % BlkSize) == 0) ? RegionSize / BlkSize : RegionSize / BlkSize + 1;
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BlockDev->StartBlock = RegionBase / BlkSize;
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BlockDev->LastBlock = BlockDev->StartBlock + BlockNum;
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DEBUG ((DEBUG_INFO, "0x%08x--0x%08x, LBA count: 0x%x\n", (UINT32)BlockDev->StartBlock, \
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(UINT32)BlockDev->LastBlock, BlockNum));
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}
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PartBlockDev->BlockDeviceCount++;
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}
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/**
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This function finds SPI partitions from BIOS region.
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This function gets flash IAS regoins from flash map for block read/write.
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It will takes every region as a separate software partition.
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@param[in, out] PartBlockDev Parition block device pointer
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@retval EFI_SUCCESS New partitions are detected and logical block devices
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are added to block device array
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@retval EFI_NOT_FOUND No New partitions are added
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@retval EFI_INVALID_PARAMETER The SPI flash block number or size is 0.
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**/
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EFI_STATUS
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FindSpiPartitions (
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IN OUT PART_BLOCK_DEVICE *PartBlockDev
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)
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{
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EFI_STATUS Status;
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UINT32 IasRegionBase;
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UINT32 IasRegionSize;
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DEVICE_BLOCK_INFO *DevBlockInfo;
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DevBlockInfo = &PartBlockDev->BlockInfo;
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if (DevBlockInfo->BlockSize == 0 || DevBlockInfo->BlockNum == 0) {
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return EFI_INVALID_PARAMETER;
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}
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PartBlockDev->PartitionChecked = FALSE;
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PartBlockDev->BlockDeviceCount = 0;
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// Get first IAS region as partition
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Status = GetComponentInfo (FLASH_MAP_SIG_SPI_IAS1, &IasRegionBase, &IasRegionSize);
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if (!EFI_ERROR(Status)) {
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AddSpiPartition (PartBlockDev, IasRegionBase, IasRegionSize);
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} else {
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AddSpiPartition (PartBlockDev, IasRegionBase, 0);
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}
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// Check if the second IAS region exists.
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Status = GetComponentInfo (FLASH_MAP_SIG_SPI_IAS2, &IasRegionBase, &IasRegionSize);
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if (!EFI_ERROR(Status)) {
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AddSpiPartition (PartBlockDev, IasRegionBase, IasRegionSize);
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}
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DEBUG ((DEBUG_INFO, "SPI BIOS region: (%d logical partitions)\n", \
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PartBlockDev->BlockDeviceCount));
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PartBlockDev->PartitionChecked = TRUE;
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return EFI_SUCCESS;
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}
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