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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [cpu/] [powerpc/] [new_exception_processing/] [cpu.c] - Rev 30
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/* * 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: cpu.c,v 1.2 2001-09-27 11:59:29 chris Exp $ */ #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 ) { }
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