score/sparc: Add support for paravirtualization

Guest systems in paravirtualization environments run usually in user
mode.  Thus it is not possible to directly access the PSR and TBR
registers.  Use functions instead of inline assembler to access these
registers if RTEMS_PARAVIRT is defined.

1 files changed, 44 insertions, 0 deletions

diff --git a/cpukit/score/cpu/sparc/rtems/score/sparc.h b/cpukit/score/cpu/sparc/rtems/score/sparc.h
index 75f6d96e74..abd0f8b987 100644
--- a/cpukit/score/cpu/sparc/rtems/score/sparc.h
+++ b/cpukit/score/cpu/sparc/rtems/score/sparc.h
@@ -164,17 +164,37 @@ extern "C" {
  *
  * This macro returns the current contents of the PSR register in @a _psr.
  */
+#if defined(RTEMS_PARAVIRT)
+
+uint32_t _SPARC_Get_PSR( void );
+
+#define sparc_get_psr( _psr ) \
+  (_psr) = _SPARC_Get_PSR()
+
+#else /* RTEMS_PARAVIRT */
+
 #define sparc_get_psr( _psr ) \
   do { \
      (_psr) = 0; \
      __asm__ volatile( "rd %%psr, %0" :  "=r" (_psr) : "0" (_psr) ); \
   } while ( 0 )
 
+#endif /* RTEMS_PARAVIRT */
+
 /**
  * @brief Macro to set the PSR.
  *
  * This macro sets the PSR register to the value in @a _psr.
  */
+#if defined(RTEMS_PARAVIRT)
+
+void _SPARC_Set_PSR( uint32_t new_psr );
+
+#define sparc_set_psr( _psr ) \
+  _SPARC_Set_PSR( _psr )
+
+#else /* RTEMS_PARAVIRT */
+
 #define sparc_set_psr( _psr ) \
   do { \
     __asm__ volatile ( "mov  %0, %%psr " : "=r" ((_psr)) : "0" ((_psr)) ); \
@@ -183,27 +203,51 @@ extern "C" {
     nop(); \
   } while ( 0 )
 
+#endif /* RTEMS_PARAVIRT */
+
 /**
  * @brief Macro to obtain the TBR.
  *
  * This macro returns the current contents of the TBR register in @a _tbr.
  */
+#if defined(RTEMS_PARAVIRT)
+
+uint32_t _SPARC_Get_TBR( void );
+
+#define sparc_get_tbr( _tbr ) \
+  (_tbr) = _SPARC_Get_TBR()
+
+#else /* RTEMS_PARAVIRT */
+
 #define sparc_get_tbr( _tbr ) \
   do { \
      (_tbr) = 0; /* to avoid unitialized warnings */ \
      __asm__ volatile( "rd %%tbr, %0" :  "=r" (_tbr) : "0" (_tbr) ); \
   } while ( 0 )
 
+#endif /* RTEMS_PARAVIRT */
+
 /**
  * @brief Macro to set the TBR.
  *
  * This macro sets the TBR register to the value in @a _tbr.
  */
+#if defined(RTEMS_PARAVIRT)
+
+void _SPARC_Set_TBR( uint32_t new_tbr );
+
+#define sparc_set_tbr( _tbr ) \
+  _SPARC_Set_TBR((_tbr))
+
+#else /* RTEMS_PARAVIRT */
+
 #define sparc_set_tbr( _tbr ) \
   do { \
      __asm__ volatile( "wr %0, 0, %%tbr" :  "=r" (_tbr) : "0" (_tbr) ); \
   } while ( 0 )
 
+#endif /* RTEMS_PARAVIRT */
+
 /**
  * @brief Macro to obtain the WIM.
  *