mirror of https://github.com/acidanthera/audk.git
184 lines
4.6 KiB
C
184 lines
4.6 KiB
C
/*++
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Copyright (c) 2006, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this 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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Module name:
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nvdata.c
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Abstract:
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Revision history:
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2000-Feb-03 M(f)J Genesis.
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--*/
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#include "Snp.h"
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EFI_STATUS
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pxe_nvdata_read (
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IN SNP_DRIVER *snp,
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IN UINTN RegOffset,
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IN UINTN NumBytes,
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IN OUT VOID *BufferPtr
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)
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/*++
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Routine Description:
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This routine calls Undi to read the desired number of eeprom bytes.
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Arguments:
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snp - pointer to the snp driver structure
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RegOffset - eeprom register value relative to the base address
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NumBytes - number of bytes to read
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BufferPtr - pointer where to read into
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Returns:
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--*/
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{
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PXE_DB_NVDATA *db;
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db = snp->db;
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snp->cdb.OpCode = PXE_OPCODE_NVDATA;
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snp->cdb.OpFlags = PXE_OPFLAGS_NVDATA_READ;
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snp->cdb.CPBsize = PXE_CPBSIZE_NOT_USED;
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snp->cdb.CPBaddr = PXE_CPBADDR_NOT_USED;
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snp->cdb.DBsize = sizeof (PXE_DB_NVDATA);
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snp->cdb.DBaddr = (UINT64) (UINTN) db;
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snp->cdb.StatCode = PXE_STATCODE_INITIALIZE;
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snp->cdb.StatFlags = PXE_STATFLAGS_INITIALIZE;
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snp->cdb.IFnum = snp->if_num;
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snp->cdb.Control = PXE_CONTROL_LAST_CDB_IN_LIST;
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//
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// Issue UNDI command and check result.
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//
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DEBUG ((EFI_D_NET, "\nsnp->undi.nvdata () "));
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(*snp->issue_undi32_command) ((UINT64) (UINTN) &snp->cdb);
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switch (snp->cdb.StatCode) {
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case PXE_STATCODE_SUCCESS:
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break;
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case PXE_STATCODE_UNSUPPORTED:
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DEBUG (
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(EFI_D_NET,
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"\nsnp->undi.nvdata() %xh:%xh\n",
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snp->cdb.StatFlags,
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snp->cdb.StatCode)
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);
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return EFI_UNSUPPORTED;
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default:
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DEBUG (
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(EFI_D_NET,
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"\nsnp->undi.nvdata() %xh:%xh\n",
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snp->cdb.StatFlags,
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snp->cdb.StatCode)
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);
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return EFI_DEVICE_ERROR;
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}
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CopyMem (BufferPtr, db->Data.Byte + RegOffset, NumBytes);
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return EFI_SUCCESS;
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}
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EFI_STATUS
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EFIAPI
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snp_undi32_nvdata (
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IN EFI_SIMPLE_NETWORK_PROTOCOL *this,
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IN BOOLEAN ReadOrWrite,
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IN UINTN RegOffset,
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IN UINTN NumBytes,
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IN OUT VOID *BufferPtr
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)
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/*++
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Routine Description:
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This is an interface call provided by SNP.
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It does the basic checking on the input parameters and retrieves snp structure
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and then calls the read_nvdata() call which does the actual reading
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Arguments:
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this - context pointer
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ReadOrWrite - true for reading and false for writing
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RegOffset - eeprom register relative to the base
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NumBytes - how many bytes to read
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BufferPtr - address of memory to read into
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Returns:
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--*/
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{
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SNP_DRIVER *snp;
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//
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// Get pointer to SNP driver instance for *this.
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//
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if (this == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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snp = EFI_SIMPLE_NETWORK_DEV_FROM_THIS (this);
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if (snp == NULL) {
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return EFI_DEVICE_ERROR;
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}
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//
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// Return error if the SNP is not initialized.
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//
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switch (snp->mode.State) {
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case EfiSimpleNetworkInitialized:
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break;
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case EfiSimpleNetworkStopped:
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return EFI_NOT_STARTED;
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case EfiSimpleNetworkStarted:
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return EFI_DEVICE_ERROR;
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default:
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return EFI_DEVICE_ERROR;
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}
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//
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// Return error if non-volatile memory variables are not valid.
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//
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if (snp->mode.NvRamSize == 0 || snp->mode.NvRamAccessSize == 0) {
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return EFI_UNSUPPORTED;
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}
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//
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// Check for invalid parameter combinations.
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//
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if ((NumBytes == 0) ||
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(BufferPtr == NULL) ||
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(RegOffset >= snp->mode.NvRamSize) ||
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(RegOffset + NumBytes > snp->mode.NvRamSize) ||
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(NumBytes % snp->mode.NvRamAccessSize != 0) ||
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(RegOffset % snp->mode.NvRamAccessSize != 0)
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) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// check the implementation flags of undi if we can write the nvdata!
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//
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if (!ReadOrWrite) {
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return EFI_UNSUPPORTED;
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} else {
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return pxe_nvdata_read (snp, RegOffset, NumBytes, BufferPtr);
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}
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}
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