diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/EmulatorPkg/Sec/Ia32 | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/EmulatorPkg/Sec/Ia32')
| -rw-r--r-- | roms/edk2/EmulatorPkg/Sec/Ia32/SwitchRam.S | 89 | ||||
| -rw-r--r-- | roms/edk2/EmulatorPkg/Sec/Ia32/SwitchRam.asm | 88 | ||||
| -rw-r--r-- | roms/edk2/EmulatorPkg/Sec/Ia32/TempRam.c | 59 |
3 files changed, 236 insertions, 0 deletions
diff --git a/roms/edk2/EmulatorPkg/Sec/Ia32/SwitchRam.S b/roms/edk2/EmulatorPkg/Sec/Ia32/SwitchRam.S new file mode 100644 index 000000000..d8298223a --- /dev/null +++ b/roms/edk2/EmulatorPkg/Sec/Ia32/SwitchRam.S @@ -0,0 +1,89 @@ +#------------------------------------------------------------------------------
+#
+# Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+# Module Name:
+#
+# Stack.asm
+#
+# Abstract:
+#
+# Switch the stack from temporary memory to permanent memory.
+#
+#------------------------------------------------------------------------------
+
+ .text
+
+
+//------------------------------------------------------------------------------
+// VOID
+// EFIAPI
+// SecSwitchStack (
+// UINT32 TemporaryMemoryBase,
+// UINT32 PermenentMemoryBase
+// )//
+//------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(SecSwitchStack)
+ASM_PFX(SecSwitchStack):
+#
+# Save three register: eax, ebx, ecx
+#
+ push %eax
+ push %ebx
+ push %ecx
+ push %edx
+
+#
+# !!CAUTION!! this function address's is pushed into stack after
+# migration of whole temporary memory, so need save it to permanent
+# memory at first!
+#
+
+ movl 20(%esp), %ebx # Save the first parameter
+ movl 24(%esp), %ecx # Save the second parameter
+
+#
+# Save this function's return address into permanent memory at first.
+# Then, Fixup the esp point to permanent memory
+#
+
+ movl %esp, %eax
+ subl %ebx, %eax
+ addl %ecx, %eax
+ movl (%esp), %edx # copy pushed register's value to permanent memory
+ movl %edx, (%eax)
+ movl 4(%esp), %edx
+ movl %edx, 4(%eax)
+ movl 8(%esp), %edx
+ movl %edx, 8(%eax)
+ movl 12(%esp), %edx
+ movl %edx, 12(%eax)
+ movl 16(%esp), %edx
+ movl %edx, 16(%eax)
+ movl %eax, %esp # From now, esp is pointed to permanent memory
+
+#
+# Fixup the ebp point to permanent memory
+#
+#ifndef __APPLE__
+ movl %ebp, %eax
+ subl %ebx, %eax
+ addl %ecx, %eax
+ movl %eax, %ebp # From now, ebp is pointed to permanent memory
+
+#
+# Fixup callee's ebp point for PeiDispatch
+#
+ movl (%ebp), %eax
+ subl %ebx, %eax
+ addl %ecx, %eax
+ movl %eax, (%ebp) # From now, Temporary's PPI caller's stack is in permanent memory
+#endif
+
+ pop %edx
+ pop %ecx
+ pop %ebx
+ pop %eax
+ ret
+
diff --git a/roms/edk2/EmulatorPkg/Sec/Ia32/SwitchRam.asm b/roms/edk2/EmulatorPkg/Sec/Ia32/SwitchRam.asm new file mode 100644 index 000000000..99ef00298 --- /dev/null +++ b/roms/edk2/EmulatorPkg/Sec/Ia32/SwitchRam.asm @@ -0,0 +1,88 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2007 - 2012, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; Stack.asm
+;
+; Abstract:
+;
+; Switch the stack from temporary memory to permanent memory.
+;
+;------------------------------------------------------------------------------
+
+ .586p
+ .model flat,C
+ .code
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; SecSwitchStack (
+; UINT32 TemporaryMemoryBase,
+; UINT32 PermenentMemoryBase
+; );
+;------------------------------------------------------------------------------
+SecSwitchStack PROC
+ ;
+ ; Save three register: eax, ebx, ecx
+ ;
+ push eax
+ push ebx
+ push ecx
+ push edx
+
+ ;
+ ; !!CAUTION!! this function address's is pushed into stack after
+ ; migration of whole temporary memory, so need save it to permanent
+ ; memory at first!
+ ;
+
+ mov ebx, [esp + 20] ; Save the first parameter
+ mov ecx, [esp + 24] ; Save the second parameter
+
+ ;
+ ; Save this function's return address into permanent memory at first.
+ ; Then, Fixup the esp point to permanent memory
+ ;
+ mov eax, esp
+ sub eax, ebx
+ add eax, ecx
+ mov edx, dword ptr [esp] ; copy pushed register's value to permanent memory
+ mov dword ptr [eax], edx
+ mov edx, dword ptr [esp + 4]
+ mov dword ptr [eax + 4], edx
+ mov edx, dword ptr [esp + 8]
+ mov dword ptr [eax + 8], edx
+ mov edx, dword ptr [esp + 12]
+ mov dword ptr [eax + 12], edx
+ mov edx, dword ptr [esp + 16] ; Update this function's return address into permanent memory
+ mov dword ptr [eax + 16], edx
+ mov esp, eax ; From now, esp is pointed to permanent memory
+
+ ;
+ ; Fixup the ebp point to permanent memory
+ ;
+ mov eax, ebp
+ sub eax, ebx
+ add eax, ecx
+ mov ebp, eax ; From now, ebp is pointed to permanent memory
+
+ ;
+ ; Fixup callee's ebp point for PeiDispatch
+ ;
+ mov eax, dword ptr [ebp]
+ sub eax, ebx
+ add eax, ecx
+ mov dword ptr [ebp], eax ; From now, Temporary's PPI caller's stack is in permanent memory
+
+ pop edx
+ pop ecx
+ pop ebx
+ pop eax
+ ret
+SecSwitchStack ENDP
+
+ END
diff --git a/roms/edk2/EmulatorPkg/Sec/Ia32/TempRam.c b/roms/edk2/EmulatorPkg/Sec/Ia32/TempRam.c new file mode 100644 index 000000000..e8b0d53bb --- /dev/null +++ b/roms/edk2/EmulatorPkg/Sec/Ia32/TempRam.c @@ -0,0 +1,59 @@ +/*++ @file
+ Temp RAM PPI
+
+Copyright (c) 2011, Apple Inc. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiPei.h>
+#include <Library/DebugLib.h>
+#include <Library/BaseMemoryLib.h>
+
+#include <Ppi/TemporaryRamSupport.h>
+
+VOID
+EFIAPI
+SecSwitchStack (
+ UINT32 TemporaryMemoryBase,
+ UINT32 PermenentMemoryBase
+ );
+
+
+EFI_STATUS
+EFIAPI
+SecTemporaryRamSupport (
+ IN CONST EFI_PEI_SERVICES **PeiServices,
+ IN EFI_PHYSICAL_ADDRESS TemporaryMemoryBase,
+ IN EFI_PHYSICAL_ADDRESS PermanentMemoryBase,
+ IN UINTN CopySize
+ )
+{
+ //
+ // Migrate the whole temporary memory to permanent memory.
+ //
+ CopyMem (
+ (VOID*)(UINTN)PermanentMemoryBase,
+ (VOID*)(UINTN)TemporaryMemoryBase,
+ CopySize
+ );
+
+ //
+ // SecSwitchStack function must be invoked after the memory migration
+ // immediately, also we need fixup the stack change caused by new call into
+ // permanent memory.
+ //
+ SecSwitchStack ((UINT32) TemporaryMemoryBase, (UINT32) PermanentMemoryBase);
+
+ //
+ // We need *not* fix the return address because currently,
+ // The PeiCore is executed in flash.
+ //
+
+ //
+ // Simulate to invalid temporary memory, terminate temporary memory
+ //
+ //ZeroMem ((VOID*)(UINTN)TemporaryMemoryBase, CopySize);
+
+ return EFI_SUCCESS;
+}
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