mirror of https://github.com/acidanthera/audk.git
ShellPkg : Cache the environment variable into memory to enhance
the performance. Currently UEFI Shell reads variable storage to get the environment variables every time running a new command. And reading(writing) UEFI variables is a high cost operation on most platforms. In order to enhance the performance this patch read the variable storage once and cache the environment variables in memory. Every further 'set' command will save the variable not only to Shell cache, but also the flash variable storage. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Qiu Shumin <shumin.qiu@intel.com> Reviewed-by: Jaben Carsey <jaben.carsey@intel.com> Reviewed-by:Ruiyu Ni <ruiyu.ni@intel.com>
This commit is contained in:
Qiu Shumin
parent
7a5f1426c5
commit
b62bb8854f
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@ -445,6 +445,8 @@ UefiMain (
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Status = CommandInit();
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ASSERT_EFI_ERROR(Status);
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Status = ShellInitEnvVarList ();
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//
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// Check the command line
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//
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@ -702,6 +704,8 @@ FreeResources:
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DEBUG_CODE(ShellInfoObject.ConsoleInfo = NULL;);
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}
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ShellFreeEnvVarList ();
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if (ShellCommandGetExit()) {
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return ((EFI_STATUS)ShellCommandGetExitCode());
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}
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@ -1,7 +1,7 @@
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/** @file
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function declarations for shell environment functions.
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Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2009 - 2016, 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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@ -17,6 +17,11 @@
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#define INIT_NAME_BUFFER_SIZE 128
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#define INIT_DATA_BUFFER_SIZE 1024
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//
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// The list is used to cache the environment variables.
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//
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ENV_VAR_LIST gShellEnvVarList;
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/**
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Reports whether an environment variable is Volatile or Non-Volatile.
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@ -379,3 +384,176 @@ SetEnvironmentVariables(
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//
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return (SetEnvironmentVariableList(&VarList->Link));
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}
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/**
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Find an environment variable in the gShellEnvVarList.
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@param Key The name of the environment variable.
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@param Value The value of the environment variable, the buffer
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shoule be freed by the caller.
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@param ValueSize The size in bytes of the environment variable
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including the tailing CHAR_NELL.
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@param Atts The attributes of the variable.
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@retval EFI_SUCCESS The command executed successfully.
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@retval EFI_NOT_FOUND The environment variable is not found in
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gShellEnvVarList.
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**/
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EFI_STATUS
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ShellFindEnvVarInList (
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IN CONST CHAR16 *Key,
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OUT CHAR16 **Value,
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OUT UINTN *ValueSize,
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OUT UINT32 *Atts OPTIONAL
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)
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{
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ENV_VAR_LIST *Node;
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if (Key == NULL || Value == NULL || ValueSize == NULL) {
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return SHELL_INVALID_PARAMETER;
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}
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for ( Node = (ENV_VAR_LIST*)GetFirstNode(&gShellEnvVarList.Link)
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; !IsNull(&gShellEnvVarList.Link, &Node->Link)
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; Node = (ENV_VAR_LIST*)GetNextNode(&gShellEnvVarList.Link, &Node->Link)
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){
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if (Node->Key != NULL && StrCmp(Key, Node->Key) == 0) {
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*Value = AllocateCopyPool(StrSize(Node->Val), Node->Val);
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*ValueSize = StrSize(Node->Val);
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if (Atts != NULL) {
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*Atts = Node->Atts;
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}
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return EFI_SUCCESS;
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}
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}
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return EFI_NOT_FOUND;
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}
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/**
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Add an environment variable into gShellEnvVarList.
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@param Key The name of the environment variable.
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@param Value The value of environment variable.
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@param ValueSize The size in bytes of the environment variable
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including the tailing CHAR_NULL
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@param Atts The attributes of the variable.
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**/
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VOID
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ShellAddEnvVarToList (
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IN CONST CHAR16 *Key,
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IN CONST CHAR16 *Value,
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IN UINTN ValueSize,
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IN UINT32 Atts
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)
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{
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ENV_VAR_LIST *Node;
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if (Key == NULL || Value == NULL || ValueSize == 0) {
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return;
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}
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//
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// Update the variable value if it exists in gShellEnvVarList.
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//
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for ( Node = (ENV_VAR_LIST*)GetFirstNode(&gShellEnvVarList.Link)
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; !IsNull(&gShellEnvVarList.Link, &Node->Link)
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; Node = (ENV_VAR_LIST*)GetNextNode(&gShellEnvVarList.Link, &Node->Link)
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){
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if (Node->Key != NULL && StrCmp(Key, Node->Key) == 0) {
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Node->Atts = Atts;
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SHELL_FREE_NON_NULL(Node->Val);
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Node->Val = AllocateZeroPool (ValueSize);
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ASSERT (Node->Val != NULL);
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CopyMem(Node->Val, Value, ValueSize);
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return;
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}
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}
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//
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// If the environment varialbe key doesn't exist in list just insert
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// a new node.
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//
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Node = (ENV_VAR_LIST*)AllocateZeroPool (sizeof(ENV_VAR_LIST));
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ASSERT (Node != NULL);
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Node->Key = AllocateCopyPool(StrSize(Key), Key);
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ASSERT (Node->Key != NULL);
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Node->Val = AllocateCopyPool(ValueSize, Value);
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ASSERT (Node->Val != NULL);
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Node->Atts = Atts;
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InsertTailList(&gShellEnvVarList.Link, &Node->Link);
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return;
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}
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/**
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Remove a specified environment variable in gShellEnvVarList.
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@param Key The name of the environment variable.
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@retval EFI_SUCCESS The command executed successfully.
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@retval EFI_NOT_FOUND The environment variable is not found in
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gShellEnvVarList.
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**/
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EFI_STATUS
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ShellRemvoeEnvVarFromList (
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IN CONST CHAR16 *Key
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)
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{
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ENV_VAR_LIST *Node;
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if (Key == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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for ( Node = (ENV_VAR_LIST*)GetFirstNode(&gShellEnvVarList.Link)
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; !IsNull(&gShellEnvVarList.Link, &Node->Link)
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; Node = (ENV_VAR_LIST*)GetNextNode(&gShellEnvVarList.Link, &Node->Link)
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){
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if (Node->Key != NULL && StrCmp(Key, Node->Key) == 0) {
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SHELL_FREE_NON_NULL(Node->Key);
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SHELL_FREE_NON_NULL(Node->Val);
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RemoveEntryList(&Node->Link);
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SHELL_FREE_NON_NULL(Node);
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return EFI_SUCCESS;
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}
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}
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return EFI_NOT_FOUND;
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}
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/**
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Initialize the gShellEnvVarList and cache all Shell-Guid-based environment
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variables.
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**/
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EFI_STATUS
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ShellInitEnvVarList (
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VOID
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)
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{
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EFI_STATUS Status;
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InitializeListHead(&gShellEnvVarList.Link);
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Status = GetEnvironmentVariableList (&gShellEnvVarList.Link);
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return Status;
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}
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/**
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Destructe the gShellEnvVarList.
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**/
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VOID
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ShellFreeEnvVarList (
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VOID
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)
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{
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FreeEnvironmentVariableList (&gShellEnvVarList.Link);
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InitializeListHead(&gShellEnvVarList.Link);
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return;
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}
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@ -6,7 +6,7 @@
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//#include <Library/UefiRuntimeServicesTableLib.h>
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Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2009 - 2016, 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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@ -27,6 +27,12 @@ typedef struct {
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UINT32 Atts;
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} ENV_VAR_LIST;
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//
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// The list is used to cache the environment variables.
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//
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extern ENV_VAR_LIST gShellEnvVarList;
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/**
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Reports whether an environment variable is Volatile or Non-Volatile
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@ -206,5 +212,79 @@ FreeEnvironmentVariableList(
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IN LIST_ENTRY *List
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);
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/**
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Find an environment variable in the gShellEnvVarList.
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@param Key The name of the environment variable.
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@param Value The value of the environment variable, the buffer
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shoule be freed by the caller.
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@param ValueSize The size in bytes of the environment variable
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including the tailing CHAR_NULL.
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@param Atts The attributes of the variable.
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@retval EFI_SUCCESS The command executed successfully.
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@retval EFI_NOT_FOUND The environment variable is not found in
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gShellEnvVarList.
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**/
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EFI_STATUS
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ShellFindEnvVarInList (
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IN CONST CHAR16 *Key,
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OUT CHAR16 **Value,
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OUT UINTN *ValueSize,
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OUT UINT32 *Atts OPTIONAL
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);
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/**
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Add an environment variable into gShellEnvVarList.
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@param Key The name of the environment variable.
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@param Value The value of environment variable.
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@param ValueSize The size in bytes of the environment variable
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including the tailing CHAR_NELL
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@param Atts The attributes of the variable.
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**/
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VOID
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ShellAddEnvVarToList (
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IN CONST CHAR16 *Key,
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IN CONST CHAR16 *Value,
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IN UINTN ValueSize,
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IN UINT32 Atts
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);
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/**
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Remove a specified environment variable in gShellEnvVarList.
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@param Key The name of the environment variable.
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@retval EFI_SUCCESS The command executed successfully.
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@retval EFI_NOT_FOUND The environment variable is not found in
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gShellEnvVarList.
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**/
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EFI_STATUS
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ShellRemvoeEnvVarFromList (
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IN CONST CHAR16 *Key
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);
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/**
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Initialize the gShellEnvVarList and cache all Shell-Guid-based environment
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variables.
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**/
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EFI_STATUS
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ShellInitEnvVarList (
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VOID
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);
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/**
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Destructe the gShellEnvVarList.
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**/
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VOID
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ShellFreeEnvVarList (
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VOID
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);
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#endif //_SHELL_ENVIRONMENT_VARIABLE_HEADER_
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@ -2691,7 +2691,6 @@ EfiShellGetEnvEx(
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EFI_STATUS Status;
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VOID *Buffer;
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UINTN Size;
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LIST_ENTRY List;
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ENV_VAR_LIST *Node;
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CHAR16 *CurrentWriteLocation;
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@ -2699,21 +2698,13 @@ EfiShellGetEnvEx(
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Buffer = NULL;
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if (Name == NULL) {
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//
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// Get all our environment variables
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//
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InitializeListHead(&List);
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Status = GetEnvironmentVariableList(&List);
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if (EFI_ERROR(Status)){
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return (NULL);
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}
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//
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// Build the semi-colon delimited list. (2 passes)
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//
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for ( Node = (ENV_VAR_LIST*)GetFirstNode(&List)
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; !IsNull(&List, &Node->Link)
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; Node = (ENV_VAR_LIST*)GetNextNode(&List, &Node->Link)
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for ( Node = (ENV_VAR_LIST*)GetFirstNode(&gShellEnvVarList.Link)
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; !IsNull(&gShellEnvVarList.Link, &Node->Link)
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; Node = (ENV_VAR_LIST*)GetNextNode(&gShellEnvVarList.Link, &Node->Link)
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){
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ASSERT(Node->Key != NULL);
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Size += StrSize(Node->Key);
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@ -2723,16 +2714,13 @@ EfiShellGetEnvEx(
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Buffer = AllocateZeroPool(Size);
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if (Buffer == NULL) {
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if (!IsListEmpty (&List)) {
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FreeEnvironmentVariableList(&List);
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}
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return (NULL);
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}
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CurrentWriteLocation = (CHAR16*)Buffer;
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for ( Node = (ENV_VAR_LIST*)GetFirstNode(&List)
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; !IsNull(&List, &Node->Link)
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; Node = (ENV_VAR_LIST*)GetNextNode(&List, &Node->Link)
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for ( Node = (ENV_VAR_LIST*)GetFirstNode(&gShellEnvVarList.Link)
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; !IsNull(&gShellEnvVarList.Link, &Node->Link)
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; Node = (ENV_VAR_LIST*)GetNextNode(&gShellEnvVarList.Link, &Node->Link)
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){
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ASSERT(Node->Key != NULL);
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StrCpyS( CurrentWriteLocation,
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@ -2742,17 +2730,13 @@ EfiShellGetEnvEx(
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CurrentWriteLocation += StrLen(CurrentWriteLocation) + 1;
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}
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//
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// Free the list...
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//
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if (!IsListEmpty (&List)) {
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FreeEnvironmentVariableList(&List);
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}
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} else {
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//
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// We are doing a specific environment variable
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//
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Status = ShellFindEnvVarInList(Name, (CHAR16**)&Buffer, &Size, Attributes);
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if (EFI_ERROR(Status)){
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//
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// get the size we need for this EnvVariable
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//
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@ -2773,6 +2757,16 @@ EfiShellGetEnvEx(
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FreePool(Buffer);
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}
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return (NULL);
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} else {
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//
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// If we did not find the environment variable in the gShellEnvVarList
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// but get it from UEFI variable storage successfully then we need update
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// the gShellEnvVarList.
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//
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ShellFreeEnvVarList ();
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Status = ShellInitEnvVarList ();
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ASSERT (Status == EFI_SUCCESS);
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}
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}
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}
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@ -2832,14 +2826,35 @@ InternalEfiShellSetEnv(
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IN BOOLEAN Volatile
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)
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{
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EFI_STATUS Status;
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UINT32 Atts;
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Atts = 0x0;
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if (Value == NULL || StrLen(Value) == 0) {
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return (SHELL_DELETE_ENVIRONMENT_VARIABLE(Name));
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Status = SHELL_DELETE_ENVIRONMENT_VARIABLE(Name);
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if (!EFI_ERROR(Status)) {
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ShellRemvoeEnvVarFromList(Name);
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}
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return Status;
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} else {
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SHELL_DELETE_ENVIRONMENT_VARIABLE(Name);
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if (Volatile) {
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return (SHELL_SET_ENVIRONMENT_VARIABLE_V(Name, StrSize(Value), Value));
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Status = SHELL_SET_ENVIRONMENT_VARIABLE_V(Name, StrSize(Value), Value);
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if (!EFI_ERROR(Status)) {
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Atts &= ~EFI_VARIABLE_NON_VOLATILE;
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Atts |= EFI_VARIABLE_BOOTSERVICE_ACCESS;
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ShellAddEnvVarToList(Name, Value, StrSize(Value), Atts);
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}
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return Status;
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} else {
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return (SHELL_SET_ENVIRONMENT_VARIABLE_NV(Name, StrSize(Value), Value));
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Status = SHELL_SET_ENVIRONMENT_VARIABLE_NV(Name, StrSize(Value), Value);
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if (!EFI_ERROR(Status)) {
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Atts |= EFI_VARIABLE_NON_VOLATILE;
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Atts |= EFI_VARIABLE_BOOTSERVICE_ACCESS;
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ShellAddEnvVarToList(Name, Value, StrSize(Value), Atts);
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}
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return Status;
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}
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}
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}
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Reference in New Issue