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/*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdint.h>
#include <rtems/system.h>
typedef struct {
uint16_t sbLow;
uint16_t sbHigh; /* push/pop sb */
uint16_t flg; /* push/pop flg */
uint32_t a1; /* pushm */
uint32_t a0;
uint32_t r0r2;
uint32_t r1r3;
uint16_t frameLow; /* exitd */
uint16_t frameHigh;
uint16_t startLow;
uint16_t startHigh;
uint16_t zero;
} Starting_Frame;
#if defined(__r8c_cpu__)
#warning "_get_sb: not implemented on R8C"
#define _get_sb( _sb )
#else
#define _get_sb( _sb ) \
__asm__ volatile( "stc sb, %0" : "=r" (_sb))
#endif
void _CPU_Context_Initialize(
Context_Control *the_context,
uint32_t *stack_base,
size_t size,
uint32_t new_level,
void *entry_point,
bool is_fp
)
{
void *stackEnd = stack_base;
register uint32_t sb;
Starting_Frame *frame;
_get_sb( sb );
stackEnd += size;
frame = (Starting_Frame *)stackEnd;
frame--;
frame->zero = 0;
frame->sbLow = ((uint32_t)sb) & 0xffff;
frame->sbHigh = ((uint32_t)sb >> 16) & 0xffff;
frame->flg = 0x80; /* User stack */
if ( !new_level ) /* interrupt level 0 --> enabled */
frame->flg |= 0x40;
frame->a0 = 0x01020304;
frame->a1 =0xa1a2a3a4;
frame->r0r2 = 0;
frame->r1r3 = 0;
#if defined(__r8c_cpu__)
#warning "not implemented on R8C"
#else
frame->frameLow = (uint16_t) (((uint32_t)frame) & 0xffff);
frame->frameHigh = (uint16_t) (((uint32_t)frame >> 16) & 0xffff);
frame->startLow = (uint16_t) (((uint32_t)entry_point) & 0xffff);
frame->startHigh = (uint16_t) (((uint32_t)entry_point >> 16) & 0xffff);
#endif
the_context->sp = (uintptr_t)frame;
the_context->fb = (uintptr_t)&frame->frameLow;
}
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