forked from Imagelibrary/rtems
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/**
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* @file
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*
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* @brief v850 CPU Initialize
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*/
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/*
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* COPYRIGHT (c) 1989-2012.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/system.h>
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#include <rtems/score/isr.h>
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#include <rtems/score/wkspace.h>
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#include <string.h> /* for memset */
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/*
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* v850 Specific Information:
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*
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* So far nothing known to be needed at this point during initialization.
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*/
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void _CPU_Initialize(void)
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{
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}
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/*
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* v850 Specific Information:
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*
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* This method returns 0 if interrupts are enabled and 1 if they are disabled.
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* The v850 only has two interrupt levels (on and off).
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*/
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uint32_t _CPU_ISR_Get_level( void )
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{
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unsigned int psw;
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v850_get_psw( psw );
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if ( (psw & V850_PSW_INTERRUPT_DISABLE_MASK) == V850_PSW_INTERRUPT_DISABLE )
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return 1;
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return 0;
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}
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/*
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* v850 Specific Information:
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*
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* This method initializes a v850 context control structure.
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*/
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void _CPU_Context_Initialize(
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Context_Control *the_context,
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uint32_t *stack_base,
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uint32_t size,
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uint32_t new_level,
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void *entry_point,
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bool is_fp,
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void *tls_area
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)
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{
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uint32_t stack_high; /* highest "stack aligned" address */
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uint32_t psw; /* highest "stack aligned" address */
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memset( the_context, 0, sizeof(Context_Control) );
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/*
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* On CPUs with stacks which grow down, we build the stack
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* based on the stack_high address.
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*/
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stack_high = ((uint32_t)(stack_base) + size);
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stack_high &= ~(CPU_STACK_ALIGNMENT - 1);
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v850_get_psw( psw );
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psw &= ~V850_PSW_INTERRUPT_DISABLE_MASK;
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if ( new_level )
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psw |= V850_PSW_INTERRUPT_DISABLE;
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else
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psw |= V850_PSW_INTERRUPT_ENABLE;
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the_context->r31 = (uint32_t) entry_point;
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the_context->r3_stack_pointer = stack_high;
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the_context->psw = psw;
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#if 0
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printk( "the_context = %p\n", the_context );
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printk( "stack base = 0x%08x\n", stack_base );
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printk( "stack size = 0x%08x\n", size );
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printk( "sp = 0x%08x\n", the_context->r3_stack_pointer );
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printk( "psw = 0x%08x\n", the_context->psw );
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#endif
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}
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