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M85 support (#556)

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* Extend support to Arm Cortex-M85

Signed-off-by: Gabor Toth <gabor.toth@arm.com>
Change-Id: I679ba8e193638126b683b651513f08df445f9fe6

* Add generated Cortex-M85 support files

Signed-off-by: Gabor Toth <gabor.toth@arm.com>
Change-Id: Ib329d88623c2936ffe3e9a24f5d6e07655e4e5c8

* Extend Trusted Firmware M port

Extend Trusted Firmware M port to Cortex-M23,
Cortex-M55 and Cortex-M85.

Signed-off-by: Gabor Toth <gabor.toth@arm.com>
Change-Id: If8f1081acfd04e547b3227579e70e355a6adffe3

* Re-run copy_files.py script

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

Signed-off-by: Gabor Toth <gabor.toth@arm.com>
Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
Co-authored-by: Gaurav-Aggarwal-AWS <33462878+aggarg@users.noreply.github.com>
Co-authored-by: Gaurav Aggarwal <aggarg@amazon.com>
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Gabor Toth 2022-09-13 18:38:25 +02:00 • committed by GitHub
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portable/GCC/ARM_CM85/secure/secure_context.c Normal file
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/*
* FreeRTOS Kernel <DEVELOPMENT BRANCH>
* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* https://www.FreeRTOS.org
* https://github.com/FreeRTOS
*
*/
/* Secure context includes. */
#include "secure_context.h"
/* Secure heap includes. */
#include "secure_heap.h"
/* Secure port macros. */
#include "secure_port_macros.h"
/**
* @brief CONTROL value for privileged tasks.
*
* Bit[0] - 0 --> Thread mode is privileged.
* Bit[1] - 1 --> Thread mode uses PSP.
*/
#define securecontextCONTROL_VALUE_PRIVILEGED 0x02
/**
* @brief CONTROL value for un-privileged tasks.
*
* Bit[0] - 1 --> Thread mode is un-privileged.
* Bit[1] - 1 --> Thread mode uses PSP.
*/
#define securecontextCONTROL_VALUE_UNPRIVILEGED 0x03
/**
* @brief Size of stack seal values in bytes.
*/
#define securecontextSTACK_SEAL_SIZE 8
/**
* @brief Stack seal value as recommended by ARM.
*/
#define securecontextSTACK_SEAL_VALUE 0xFEF5EDA5
/**
* @brief Maximum number of secure contexts.
*/
#ifndef secureconfigMAX_SECURE_CONTEXTS
#define secureconfigMAX_SECURE_CONTEXTS 8UL
#endif
/*-----------------------------------------------------------*/
/**
* @brief Pre-allocated array of secure contexts.
*/
SecureContext_t xSecureContexts[ secureconfigMAX_SECURE_CONTEXTS ];
/*-----------------------------------------------------------*/
/**
* @brief Get a free secure context for a task from the secure context pool (xSecureContexts).
*
* This function ensures that only one secure context is allocated for a task.
*
* @param[in] pvTaskHandle The task handle for which the secure context is allocated.
*
* @return Index of a free secure context in the xSecureContexts array.
*/
static uint32_t ulGetSecureContext( void * pvTaskHandle );
/**
* @brief Return the secure context to the secure context pool (xSecureContexts).
*
* @param[in] ulSecureContextIndex Index of the context in the xSecureContexts array.
*/
static void vReturnSecureContext( uint32_t ulSecureContextIndex );
/* These are implemented in assembly. */
extern void SecureContext_LoadContextAsm( SecureContext_t * pxSecureContext );
extern void SecureContext_SaveContextAsm( SecureContext_t * pxSecureContext );
/*-----------------------------------------------------------*/
static uint32_t ulGetSecureContext( void * pvTaskHandle )
{
/* Start with invalid index. */
uint32_t i, ulSecureContextIndex = secureconfigMAX_SECURE_CONTEXTS;
for( i = 0; i < secureconfigMAX_SECURE_CONTEXTS; i++ )
{
if( ( xSecureContexts[ i ].pucCurrentStackPointer == NULL ) &&
( xSecureContexts[ i ].pucStackLimit == NULL ) &&
( xSecureContexts[ i ].pucStackStart == NULL ) &&
( xSecureContexts[ i ].pvTaskHandle == NULL ) &&
( ulSecureContextIndex == secureconfigMAX_SECURE_CONTEXTS ) )
{
ulSecureContextIndex = i;
}
else if( xSecureContexts[ i ].pvTaskHandle == pvTaskHandle )
{
/* A task can only have one secure context. Do not allocate a second
* context for the same task. */
ulSecureContextIndex = secureconfigMAX_SECURE_CONTEXTS;
break;
}
}
return ulSecureContextIndex;
}
/*-----------------------------------------------------------*/
static void vReturnSecureContext( uint32_t ulSecureContextIndex )
{
xSecureContexts[ ulSecureContextIndex ].pucCurrentStackPointer = NULL;
xSecureContexts[ ulSecureContextIndex ].pucStackLimit = NULL;
xSecureContexts[ ulSecureContextIndex ].pucStackStart = NULL;
xSecureContexts[ ulSecureContextIndex ].pvTaskHandle = NULL;
}
/*-----------------------------------------------------------*/
secureportNON_SECURE_CALLABLE void SecureContext_Init( void )
{
uint32_t ulIPSR, i;
static uint32_t ulSecureContextsInitialized = 0;
/* Read the Interrupt Program Status Register (IPSR) value. */
secureportREAD_IPSR( ulIPSR );
/* Do nothing if the processor is running in the Thread Mode. IPSR is zero
* when the processor is running in the Thread Mode. */
if( ( ulIPSR != 0 ) && ( ulSecureContextsInitialized == 0 ) )
{
/* Ensure to initialize secure contexts only once. */
ulSecureContextsInitialized = 1;
/* No stack for thread mode until a task's context is loaded. */
secureportSET_PSPLIM( securecontextNO_STACK );
secureportSET_PSP( securecontextNO_STACK );
/* Initialize all secure contexts. */
for( i = 0; i < secureconfigMAX_SECURE_CONTEXTS; i++ )
{
xSecureContexts[ i ].pucCurrentStackPointer = NULL;
xSecureContexts[ i ].pucStackLimit = NULL;
xSecureContexts[ i ].pucStackStart = NULL;
xSecureContexts[ i ].pvTaskHandle = NULL;
}
#if ( configENABLE_MPU == 1 )
{
/* Configure thread mode to use PSP and to be unprivileged. */
secureportSET_CONTROL( securecontextCONTROL_VALUE_UNPRIVILEGED );
}
#else /* configENABLE_MPU */
{
/* Configure thread mode to use PSP and to be privileged. */
secureportSET_CONTROL( securecontextCONTROL_VALUE_PRIVILEGED );
}
#endif /* configENABLE_MPU */
}
}
/*-----------------------------------------------------------*/
#if ( configENABLE_MPU == 1 )
secureportNON_SECURE_CALLABLE SecureContextHandle_t SecureContext_AllocateContext( uint32_t ulSecureStackSize,
uint32_t ulIsTaskPrivileged,
void * pvTaskHandle )
#else /* configENABLE_MPU */
secureportNON_SECURE_CALLABLE SecureContextHandle_t SecureContext_AllocateContext( uint32_t ulSecureStackSize,
void * pvTaskHandle )
#endif /* configENABLE_MPU */
{
uint8_t * pucStackMemory = NULL;
uint8_t * pucStackLimit;
uint32_t ulIPSR, ulSecureContextIndex;
SecureContextHandle_t xSecureContextHandle = securecontextINVALID_CONTEXT_ID;
#if ( configENABLE_MPU == 1 )
uint32_t * pulCurrentStackPointer = NULL;
#endif /* configENABLE_MPU */
/* Read the Interrupt Program Status Register (IPSR) and Process Stack Limit
* Register (PSPLIM) value. */
secureportREAD_IPSR( ulIPSR );
secureportREAD_PSPLIM( pucStackLimit );
/* Do nothing if the processor is running in the Thread Mode. IPSR is zero
* when the processor is running in the Thread Mode.
* Also do nothing, if a secure context us already loaded. PSPLIM is set to
* securecontextNO_STACK when no secure context is loaded. */
if( ( ulIPSR != 0 ) && ( pucStackLimit == securecontextNO_STACK ) )
{
/* Ontain a free secure context. */
ulSecureContextIndex = ulGetSecureContext( pvTaskHandle );
/* Were we able to get a free context? */
if( ulSecureContextIndex < secureconfigMAX_SECURE_CONTEXTS )
{
/* Allocate the stack space. */
pucStackMemory = pvPortMalloc( ulSecureStackSize + securecontextSTACK_SEAL_SIZE );
if( pucStackMemory != NULL )
{
/* Since stack grows down, the starting point will be the last
* location. Note that this location is next to the last
* allocated byte for stack (excluding the space for seal values)
* because the hardware decrements the stack pointer before
* writing i.e. if stack pointer is 0x2, a push operation will
* decrement the stack pointer to 0x1 and then write at 0x1. */
xSecureContexts[ ulSecureContextIndex ].pucStackStart = pucStackMemory + ulSecureStackSize;
/* Seal the created secure process stack. */
*( uint32_t * )( pucStackMemory + ulSecureStackSize ) = securecontextSTACK_SEAL_VALUE;
*( uint32_t * )( pucStackMemory + ulSecureStackSize + 4 ) = securecontextSTACK_SEAL_VALUE;
/* The stack cannot go beyond this location. This value is
* programmed in the PSPLIM register on context switch.*/
xSecureContexts[ ulSecureContextIndex ].pucStackLimit = pucStackMemory;
xSecureContexts[ ulSecureContextIndex ].pvTaskHandle = pvTaskHandle;
#if ( configENABLE_MPU == 1 )
{
/* Store the correct CONTROL value for the task on the stack.
* This value is programmed in the CONTROL register on
* context switch. */
pulCurrentStackPointer = ( uint32_t * ) xSecureContexts[ ulSecureContextIndex ].pucStackStart;
pulCurrentStackPointer--;
if( ulIsTaskPrivileged )
{
*( pulCurrentStackPointer ) = securecontextCONTROL_VALUE_PRIVILEGED;
}
else
{
*( pulCurrentStackPointer ) = securecontextCONTROL_VALUE_UNPRIVILEGED;
}
/* Store the current stack pointer. This value is programmed in
* the PSP register on context switch. */
xSecureContexts[ ulSecureContextIndex ].pucCurrentStackPointer = ( uint8_t * ) pulCurrentStackPointer;
}
#else /* configENABLE_MPU */
{
/* Current SP is set to the starting of the stack. This
* value programmed in the PSP register on context switch. */
xSecureContexts[ ulSecureContextIndex ].pucCurrentStackPointer = xSecureContexts[ ulSecureContextIndex ].pucStackStart;
}
#endif /* configENABLE_MPU */
/* Ensure to never return 0 as a valid context handle. */
xSecureContextHandle = ulSecureContextIndex + 1UL;
}
}
}
return xSecureContextHandle;
}
/*-----------------------------------------------------------*/
secureportNON_SECURE_CALLABLE void SecureContext_FreeContext( SecureContextHandle_t xSecureContextHandle, void * pvTaskHandle )
{
uint32_t ulIPSR, ulSecureContextIndex;
/* Read the Interrupt Program Status Register (IPSR) value. */
secureportREAD_IPSR( ulIPSR );
/* Do nothing if the processor is running in the Thread Mode. IPSR is zero
* when the processor is running in the Thread Mode. */
if( ulIPSR != 0 )
{
/* Only free if a valid context handle is passed. */
if( ( xSecureContextHandle > 0UL ) && ( xSecureContextHandle <= secureconfigMAX_SECURE_CONTEXTS ) )
{
ulSecureContextIndex = xSecureContextHandle - 1UL;
/* Ensure that the secure context being deleted is associated with
* the task. */
if( xSecureContexts[ ulSecureContextIndex ].pvTaskHandle == pvTaskHandle )
{
/* Free the stack space. */
vPortFree( xSecureContexts[ ulSecureContextIndex ].pucStackLimit );
/* Return the secure context back to the free secure contexts pool. */
vReturnSecureContext( ulSecureContextIndex );
}
}
}
}
/*-----------------------------------------------------------*/
secureportNON_SECURE_CALLABLE void SecureContext_LoadContext( SecureContextHandle_t xSecureContextHandle, void * pvTaskHandle )
{
uint8_t * pucStackLimit;
uint32_t ulSecureContextIndex;
if( ( xSecureContextHandle > 0UL ) && ( xSecureContextHandle <= secureconfigMAX_SECURE_CONTEXTS ) )
{
ulSecureContextIndex = xSecureContextHandle - 1UL;
secureportREAD_PSPLIM( pucStackLimit );
/* Ensure that no secure context is loaded and the task is loading it's
* own context. */
if( ( pucStackLimit == securecontextNO_STACK ) &&
( xSecureContexts[ ulSecureContextIndex ].pvTaskHandle == pvTaskHandle ) )
{
SecureContext_LoadContextAsm( &( xSecureContexts[ ulSecureContextIndex ] ) );
}
}
}
/*-----------------------------------------------------------*/
secureportNON_SECURE_CALLABLE void SecureContext_SaveContext( SecureContextHandle_t xSecureContextHandle, void * pvTaskHandle )
{
uint8_t * pucStackLimit;
uint32_t ulSecureContextIndex;
if( ( xSecureContextHandle > 0UL ) && ( xSecureContextHandle <= secureconfigMAX_SECURE_CONTEXTS ) )
{
ulSecureContextIndex = xSecureContextHandle - 1UL;
secureportREAD_PSPLIM( pucStackLimit );
/* Ensure that task's context is loaded and the task is saving it's own
* context. */
if( ( xSecureContexts[ ulSecureContextIndex ].pucStackLimit == pucStackLimit ) &&
( xSecureContexts[ ulSecureContextIndex ].pvTaskHandle == pvTaskHandle ) )
{
SecureContext_SaveContextAsm( &( xSecureContexts[ ulSecureContextIndex ] ) );
}
}
}
/*-----------------------------------------------------------*/