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Maurice Ma
133 lines
2.6 KiB
C
133 lines
2.6 KiB
C
/** @file
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Shell command `io` to read/write I/O ports.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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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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**/
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#include <Library/ShellLib.h>
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#include <Library/IoLib.h>
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/**
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Read or write I/O ports.
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@param[in] Shell shell instance
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@param[in] Argc number of command line arguments
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@param[in] Argv command line arguments
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@retval EFI_SUCCESS
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**/
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STATIC
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EFI_STATUS
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EFIAPI
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ShellCommandIoFunc (
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IN SHELL *Shell,
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IN UINTN Argc,
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IN CHAR16 *Argv[]
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);
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CONST SHELL_COMMAND ShellCommandIo = {
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L"io",
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L"Read or write I/O ports",
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&ShellCommandIoFunc
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};
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/**
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Read or write I/O ports.
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@param[in] Shell shell instance
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@param[in] Argc number of command line arguments
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@param[in] Argv command line arguments
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@retval EFI_SUCCESS
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**/
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STATIC
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EFI_STATUS
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EFIAPI
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ShellCommandIoFunc (
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IN SHELL *Shell,
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IN UINTN Argc,
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IN CHAR16 *Argv[]
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)
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{
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UINTN Addr, Width;
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BOOLEAN Write;
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UINT64 Value;
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Value = 0;
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if ((Argc == 2) || (Argc == 3)) {
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// Read 1 element
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Write = FALSE;
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} else if (Argc == 4) {
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// Write 1 element
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Write = TRUE;
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Value = StrHexToUint64 (Argv[3]);
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} else {
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// Invalid
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goto usage;
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}
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// Parse access width
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if (Argc > 2) {
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Width = StrHexToUintn (Argv[2]);
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if ((Width != 1) && (Width != 2) && (Width != 4)) {
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ShellPrint (L"Error: Width must be 1, 2, or 4\n");
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return EFI_INVALID_PARAMETER;
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}
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} else {
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Width = 1;
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}
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// Parse access address
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Addr = StrHexToUintn (Argv[1]);
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if (Write) {
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switch (Width) {
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case 1:
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IoWrite8 (Addr, (UINT8)Value);
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break;
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case 2:
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IoWrite16 (Addr, (UINT16)Value);
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break;
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case 4:
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IoWrite32 (Addr, (UINT32)Value);
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break;
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default:
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break;
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}
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} else {
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ShellPrint (L"0x%x: ", Addr);
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switch (Width) {
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case 1:
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ShellPrint (L"0x%02x", IoRead8 (Addr));
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break;
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case 2:
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ShellPrint (L"0x%04x", IoRead16 (Addr));
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break;
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case 4:
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ShellPrint (L"0x%08x", IoRead32 (Addr));
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break;
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default:
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break;
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}
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ShellPrint (L"\n");
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}
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return EFI_SUCCESS;
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usage:
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ShellPrint (L"Usage: %s <addr> [<width> [<val>]]\n", Argv[0]);
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return EFI_ABORTED;
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}
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