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/**
* @file
*
* @brief PowerPC Paravirtualization Definitions
*
* This include file contains definitions pertaining to paravirtualization
* of the PowerPC 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 ParavirtPowerPC Paravirtualization PowerPC Support
*
* @ingroup Score
*
* This handler encapulates the functionality (primarily conditional
* feature defines) related to paravirtualization on the PowerPC.
*
* Paravirtualization on the PowerPC makes the following assumptions:
*
* - RTEMS executes in user space
* - In user space there is no access to the MSR.
* - 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 PPC_DISABLE_INLINE_ISR_DISABLE_ENABLE
/**
* In a paravirtualized environment, RTEMS executes in user space
* and cannot access the MSR.
*
* Try to have as little impact as possible with this define. Leave
* the msr in the thread context because that would impact the definition
* of offsets for assembly code.
*/
#define PPC_DISABLE_MSR_ACCESS
#endif
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