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bsp/genmcf548x: Enable FPU in BSP startup code

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This commit is contained in:
Sebastian Huber
2012-04-20 14:03:39 +02:00
parent ca4a4cfb64
commit 6d136ed9dd
1 changed files with 5 additions and 13 deletions
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18
c/src/lib/libbsp/m68k/genmcf548x/startup/bspstart.c
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@@ -70,8 +70,10 @@ extern char WorkAreaBase [];
#define m68k_set_acr3(_acr3) __asm__ volatile ("movec %0,#0x0007" : : "d" (_acr3))
/*
* Set initial cacr mode, mainly enables branch/intruction/data cache and
* switch off FPU.
* Set initial CACR mode, mainly enables branch/instruction/data cache. The
* FPU must be switched on in the BSP startup code since the
* _Thread_Start_multitasking() will restore the floating-point context of the
* initialization task if necessary.
*/
static const uint32_t BSP_CACR_INIT = MCF548X_CACR_DEC /* enable data cache */
| MCF548X_CACR_BEC /* enable branch cache */
@@ -80,8 +82,7 @@ static const uint32_t BSP_CACR_INIT = MCF548X_CACR_DEC /* enable data cache */
/* set data cache mode to write-through */
| MCF548X_CACR_DESB /* enable data store buffer */
| MCF548X_CACR_DDSP /* data access only in supv. mode */
| MCF548X_CACR_IDSP /* instr. access only in supv. mode */
| MCF548X_CACR_DF; /* disable FPU */
| MCF548X_CACR_IDSP; /* instr. access only in supv. mode */
/*
* CACR maintenance functions
@@ -273,15 +274,6 @@ void bsp_start( void )
/* Initialize CACR shadow register */
_CPU_cacr_shadow = BSP_CACR_INIT;
/* Switch on FPU in CACR shadow register if necessary */
if ((Configuration_POSIX_API.number_of_initialization_threads > 0) ||
((Configuration_RTEMS_API.number_of_initialization_tasks > 0) &&
(Configuration_RTEMS_API.User_initialization_tasks_table
->attribute_set & RTEMS_FLOATING_POINT) != 0)
) {
_CPU_cacr_shadow &= ~MCF548X_CACR_DF;
}
/*
* Load the shadow variable of CACR with initial mode and write it to the
* CACR. Interrupts are still disabled, so there is no need for surrounding