/** @file Switch Stack functions. Copyright (c) 2006 - 2007, Intel Corporation
All rights reserved. This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this distribution. The full text of the license may be found at http://opensource.org/licenses/bsd-license.php THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. **/ // // Include common header file for this module. // #include #include #include #include /** Transfers control to a function starting with a new stack. Transfers control to the function specified by EntryPoint using the new stack specified by NewStack and passing in the parameters specified by Context1 and Context2. Context1 and Context2 are optional and may be NULL. The function EntryPoint must never return. If EntryPoint is NULL, then ASSERT(). If NewStack is NULL, then ASSERT(). @param EntryPoint A pointer to function to call with the new stack. @param Context1 A pointer to the context to pass into the EntryPoint function. @param Context2 A pointer to the context to pass into the EntryPoint function. @param NewStack A pointer to the new stack to use for the EntryPoint function. @param NewBsp A pointer to the new BSP for the EntryPoint on IPF. It's Reserved on other architectures. **/ VOID EFIAPI PeiSwitchStacks ( IN SWITCH_STACK_ENTRY_POINT EntryPoint, IN VOID *Context1, OPTIONAL IN VOID *Context2, OPTIONAL IN VOID *Context3, OPTIONAL IN VOID *OldTopOfStack, IN VOID *NewStack ) { BASE_LIBRARY_JUMP_BUFFER JumpBuffer; ASSERT (EntryPoint != NULL); ASSERT (NewStack != NULL); // // Stack should be aligned with CPU_STACK_ALIGNMENT // ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0); JumpBuffer.Eip = (UINTN)EntryPoint; JumpBuffer.Esp = (UINTN)NewStack - sizeof (VOID*); JumpBuffer.Esp -= sizeof (Context1) + sizeof (Context2) + sizeof(Context3); ((VOID**)JumpBuffer.Esp)[1] = Context1; ((VOID**)JumpBuffer.Esp)[2] = Context2; ((VOID**)JumpBuffer.Esp)[3] = Context3; LongJump (&JumpBuffer, (UINTN)-1); // // InternalSwitchStack () will never return // ASSERT (FALSE); } /** Transfers control to a function starting with a new stack. Transfers control to the function specified by EntryPoint using the new stack specified by NewStack and passing in the parameters specified by Context1 and Context2. Context1 and Context2 are optional and may be NULL. The function EntryPoint must never return. If EntryPoint is NULL, then ASSERT(). If NewStack is NULL, then ASSERT(). @param EntryPoint A pointer to function to call with the new stack. @param Context1 A pointer to the context to pass into the EntryPoint function. @param Context2 A pointer to the context to pass into the EntryPoint function. @param NewStack A pointer to the new stack to use for the EntryPoint function. @param NewBsp A pointer to the new BSP for the EntryPoint on IPF. It's Reserved on other architectures. **/ VOID EFIAPI SecSwitchStack ( IN UINTN TemporaryMemoryBase, IN UINTN PermanentMemoryBase, IN UINTN CopySize ) { BASE_LIBRARY_JUMP_BUFFER JumpBuffer; UINTN SetJumpFlag; ASSERT ((VOID*)TemporaryMemoryBase != NULL); ASSERT ((VOID*)PermanentMemoryBase != NULL); SetJumpFlag = SetJump (&JumpBuffer); // // The initial call to SetJump() must always return 0. // Subsequent calls to LongJump() may cause a non-zero value to be returned by SetJump(). // if (SetJumpFlag == 0) { DEBUG ((EFI_D_ERROR, "SecSwitchStack+%d: Esp: 0x%xL\n", __LINE__, JumpBuffer.Esp)); JumpBuffer.Esp = (INTN)JumpBuffer.Esp - (INTN)TemporaryMemoryBase + (INTN)PermanentMemoryBase; MemoryFence (); CopyMem((VOID*)PermanentMemoryBase, (VOID*)TemporaryMemoryBase, CopySize); LongJump (&JumpBuffer, (UINTN)-1); } }