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| author | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2013-03-12 00:54:02 +0000 |
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| committer | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2013-03-12 00:54:02 +0000 |
| commit | a9d7090fc217dad23330ddc54cad4d4987cab65a (patch) | |
| tree | 8d20f2d187e0b2322815ef0fafd6149490092239 /ArmPlatformPkg/Sec/Helper.asm | |
| parent | c63626b7d31cb8c6ffee5870de742f4aa859fee8 (diff) | |
| download | edk2-platforms-a9d7090fc217dad23330ddc54cad4d4987cab65a.tar.xz | |
ArmPlatformPkg: Moved ARMv7 specific files to a 'Arm' subdirectory
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14182 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'ArmPlatformPkg/Sec/Helper.asm')
| -rw-r--r-- | ArmPlatformPkg/Sec/Helper.asm | 79 |
1 files changed, 0 insertions, 79 deletions
diff --git a/ArmPlatformPkg/Sec/Helper.asm b/ArmPlatformPkg/Sec/Helper.asm deleted file mode 100644 index b31cc31a97..0000000000 --- a/ArmPlatformPkg/Sec/Helper.asm +++ /dev/null @@ -1,79 +0,0 @@ -//
-// Copyright (c) 2011-2012, ARM Limited. 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.
-//
-//
-
- EXPORT return_from_exception
- EXPORT enter_monitor_mode
- EXPORT copy_cpsr_into_spsr
- EXPORT set_non_secure_mode
-
- AREA Helper, CODE, READONLY
-
-// r0: Monitor World EntryPoint
-// r1: MpId
-// r2: SecBootMode
-// r3: Secure Monitor mode stack
-enter_monitor_mode FUNCTION
- cmp r3, #0 // If a Secure Monitor stack base has not been defined then use the Secure stack
- moveq r3, sp
-
- mrs r4, cpsr // Save current mode (SVC) in r4
- bic r5, r4, #0x1f // Clear all mode bits
- orr r5, r5, #0x16 // Set bits for Monitor mode
- msr cpsr_cxsf, r5 // We are now in Monitor Mode
-
- mov sp, r3 // Set the stack of the Monitor Mode
-
- mov lr, r0 // Use the pass entrypoint as lr
-
- msr spsr_cxsf, r4 // Use saved mode for the MOVS jump to the kernel
-
- mov r4, r0 // Swap EntryPoint and MpId registers
- mov r0, r1
- mov r1, r2
- mov r2, r3
-
- bx r4
- ENDFUNC
-
-// We cannot use the instruction 'movs pc, lr' because the caller can be written either in ARM or Thumb2 assembler.
-// When we will jump into this function, we will set the CPSR flag to ARM assembler. By copying directly 'lr' into
-// 'pc'; we will not change the CPSR flag and it will crash.
-// The way to fix this limitation is to do the movs into the ARM assmbler code and then do a 'bx'.
-return_from_exception
- adr lr, returned_exception
- movs pc, lr
-returned_exception // We are now in non-secure state
- bx r0
-
-// Save the current Program Status Register (PSR) into the Saved PSR
-copy_cpsr_into_spsr
- mrs r0, cpsr
- msr spsr_cxsf, r0
- bx lr
-
-// Set the Non Secure Mode
-set_non_secure_mode
- push { r1 }
- and r0, r0, #0x1f // Keep only the mode bits
- mrs r1, spsr // Read the spsr
- bic r1, r1, #0x1f // Clear all mode bits
- orr r1, r1, r0
- msr spsr_cxsf, r1 // write back spsr (may have caused a mode switch)
- isb
- pop { r1 }
- bx lr // return (hopefully thumb-safe!)
-
-dead
- B dead
-
- END
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