diff options
Diffstat (limited to 'c/src/exec/score/cpu/powerpc/new_exception_processing/cpu.c')
| -rw-r--r-- | c/src/exec/score/cpu/powerpc/new_exception_processing/cpu.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/c/src/exec/score/cpu/powerpc/new_exception_processing/cpu.c b/c/src/exec/score/cpu/powerpc/new_exception_processing/cpu.c new file mode 100644 index 0000000000..e1c6eac4fd --- /dev/null +++ b/c/src/exec/score/cpu/powerpc/new_exception_processing/cpu.c @@ -0,0 +1,116 @@ +/* + * PowerPC CPU Dependent Source + * + * Author: Andrew Bray <andy@i-cubed.co.uk> + * + * COPYRIGHT (c) 1995 by i-cubed ltd. + * + * To anyone who acknowledges that this file is provided "AS IS" + * without any express or implied warranty: + * permission to use, copy, modify, and distribute this file + * for any purpose is hereby granted without fee, provided that + * the above copyright notice and this notice appears in all + * copies, and that the name of i-cubed limited not be used in + * advertising or publicity pertaining to distribution of the + * software without specific, written prior permission. + * i-cubed limited makes no representations about the suitability + * of this software for any purpose. + * + * Derived from c/src/exec/cpu/no_cpu/cpu.c: + * + * COPYRIGHT (c) 1989-1997. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may be found in + * the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#include <rtems/system.h> +#include <rtems/score/isr.h> +#include <rtems/score/context.h> +#include <rtems/score/thread.h> +#include <rtems/score/interr.h> + + +/* _CPU_Initialize + * + * This routine performs processor dependent initialization. + * + * INPUT PARAMETERS: + * cpu_table - CPU table to initialize + * thread_dispatch - address of disptaching routine + */ + +void _CPU_Initialize( + rtems_cpu_table *cpu_table, + void (*thread_dispatch) /* ignored on this CPU */ +) +{ + _CPU_Table = *cpu_table; +} + +/*PAGE + * + * _CPU_Context_Initialize + */ + +void _CPU_Context_Initialize( + Context_Control *the_context, + unsigned32 *stack_base, + unsigned32 size, + unsigned32 new_level, + void *entry_point, + boolean is_fp +) +{ + unsigned32 msr_value; + unsigned32 sp; + + sp = (unsigned32)stack_base + size - CPU_MINIMUM_STACK_FRAME_SIZE; + *((unsigned32 *)sp) = 0; + the_context->gpr1 = sp; + + _CPU_MSR_GET( msr_value ); + + if (!(new_level & CPU_MODES_INTERRUPT_MASK)) { + msr_value |= MSR_EE; + } + else { + msr_value &= ~MSR_EE; + } + + the_context->msr = msr_value; + + /* + * The FP bit of the MSR should only be enabled if this is a floating + * point task. Unfortunately, the vfprintf_r routine in newlib + * ends up pushing a floating point register regardless of whether or + * not a floating point number is being printed. Serious restructuring + * of vfprintf.c will be required to avoid this behavior. At this + * time (7 July 1997), this restructuring is not being done. + */ + + /*if ( is_fp ) */ + the_context->msr |= PPC_MSR_FP; + + the_context->pc = (unsigned32)entry_point; +} + + + +/*PAGE + * + * _CPU_Install_interrupt_stack + */ + +void _CPU_Install_interrupt_stack( void ) +{ +} + + + + |