From c0443b4ce943fa891839c7b7be21d8ebd4370de1 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Mon, 12 Mar 2018 14:42:47 -0500 Subject: Add ARM Paravirtualization support Closes #3305. --- cpukit/score/cpu/arm/headers.am | 1 + cpukit/score/cpu/arm/include/rtems/score/arm.h | 8 ++- cpukit/score/cpu/arm/include/rtems/score/cpu.h | 9 +++ .../score/cpu/arm/include/rtems/score/paravirt.h | 75 ++++++++++++++++++++++ 4 files changed, 90 insertions(+), 3 deletions(-) create mode 100644 cpukit/score/cpu/arm/include/rtems/score/paravirt.h diff --git a/cpukit/score/cpu/arm/headers.am b/cpukit/score/cpu/arm/headers.am index 6325328189..9bbc7015b9 100644 --- a/cpukit/score/cpu/arm/headers.am +++ b/cpukit/score/cpu/arm/headers.am @@ -21,3 +21,4 @@ include_rtems_score_HEADERS += include/rtems/score/cpu.h include_rtems_score_HEADERS += include/rtems/score/cpu_asm.h include_rtems_score_HEADERS += include/rtems/score/cpuatomic.h include_rtems_score_HEADERS += include/rtems/score/cpuimpl.h +include_rtems_score_HEADERS += include/rtems/score/paravirt.h diff --git a/cpukit/score/cpu/arm/include/rtems/score/arm.h b/cpukit/score/cpu/arm/include/rtems/score/arm.h index f08da1dc57..bff4044a99 100755 --- a/cpukit/score/cpu/arm/include/rtems/score/arm.h +++ b/cpukit/score/cpu/arm/include/rtems/score/arm.h @@ -49,9 +49,11 @@ extern "C" { #define ARM_MULTILIB_HAS_BARRIER_INSTRUCTIONS #endif -#if defined(__ARM_ARCH_7A__) \ - || defined(__ARM_ARCH_7R__) - #define ARM_MULTILIB_HAS_THREAD_ID_REGISTER +#ifndef ARM_DISABLE_THREAD_ID_REGISTER_USE + #if defined(__ARM_ARCH_7A__) \ + || defined(__ARM_ARCH_7R__) + #define ARM_MULTILIB_HAS_THREAD_ID_REGISTER + #endif #endif #if defined(__ARM_ARCH_7A__) diff --git a/cpukit/score/cpu/arm/include/rtems/score/cpu.h b/cpukit/score/cpu/arm/include/rtems/score/cpu.h index 15e3ac7280..728a43c528 100644 --- a/cpukit/score/cpu/arm/include/rtems/score/cpu.h +++ b/cpukit/score/cpu/arm/include/rtems/score/cpu.h @@ -30,6 +30,9 @@ #define _RTEMS_SCORE_CPU_H #include +#if defined(RTEMS_PARAVIRT) +#include +#endif #include #if defined(ARM_MULTILIB_ARCH_V4) @@ -297,6 +300,11 @@ static inline void _ARM_Instruction_synchronization_barrier( void ) #endif } +#if defined(ARM_DISABLE_INLINE_ISR_DISABLE_ENABLE) +uint32_t arm_interrupt_disable( void ); +void arm_interrupt_enable( uint32_t level ); +void arm_interrupt_flash( uint32_t level ); +#else static inline uint32_t arm_interrupt_disable( void ) { uint32_t level; @@ -387,6 +395,7 @@ static inline void arm_interrupt_flash( uint32_t level ) ); #endif } +#endif /* !ARM_DISABLE_INLINE_ISR_DISABLE_ENABLE */ #define _CPU_ISR_Disable( _isr_cookie ) \ do { \ diff --git a/cpukit/score/cpu/arm/include/rtems/score/paravirt.h b/cpukit/score/cpu/arm/include/rtems/score/paravirt.h new file mode 100644 index 0000000000..08fb8a08ef --- /dev/null +++ b/cpukit/score/cpu/arm/include/rtems/score/paravirt.h @@ -0,0 +1,75 @@ +/** + * @file + * + * @brief ARM Paravirtualization Definitions + * + * This include file contains definitions pertaining to paravirtualization + * of the ARM port. + */ + +/* + * COPYRIGHT (c) 2018. + * On-Line Applications Research Corporation (OAR). + * + * The license and distribution terms for this file may in + * the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + + +#ifndef RTEMS_PARAVIRT +#error "This file should only be included with paravirtualization is enabled." +#endif + +#ifndef _RTEMS_SCORE_PARAVIRT_H +#define _RTEMS_SCORE_PARAVIRT_H + +/** + * @defgroup ParavirtARM Paravirtualization ARM Support + * + * @ingroup Score + * + * This handler encapulates the functionality (primarily conditional + * feature defines) related to paravirtualization on the ARM. + * + * Paravirtualization on the ARM makes the following assumptions: + * + * - RTEMS executes in user space + * - Interrupt enable/disable support using the MSR must be disabled + * and replaced with BSP provided methods which are adapted to the + * hosting environment. + */ + +#ifndef ASM + +#ifdef __cplusplus +extern "C" { +#endif + +#ifdef __cplusplus +} +#endif + +#endif /* !ASM */ + +/** + * In a paravirtualized environment, RTEMS executes in user space + * and cannot disable/enable external exceptions (e.g. interrupts). + * The BSP which acts as an adapter to the hosting environment will + * provide the interrupt enable/disable methods. + */ +#define ARM_DISABLE_INLINE_ISR_DISABLE_ENABLE + +/** + * In a paravirtualized environment, RTEMS executes in user space + * and cannot write to the the Thread ID register which is normally + * used. CP15 C13 has three variants of a Thread ID register. + * + * - Opcode_2 = 2: This register is both user and privileged R/W accessible. + * - Opcode_2 = 3: This register is user read-only and privileged + * R/W accessible. + * - Opcode_2 = 4: This register is privileged R/W accessible only. + */ +#define ARM_DISABLE_THREAD_ID_REGISTER_USE + +#endif -- cgit v1.2.3