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/*
* Copyright (c) 2011 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Obere Lagerstr. 30
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <rtems.h>
#include <bsp/vectors.h>
int ppc_exc_alignment_handler(BSP_Exception_frame *frame, unsigned excNum)
{
unsigned opcode = *(unsigned *) frame->EXC_SRR0;
/* Do we have a dcbz instruction? */
if ((opcode & 0xffe007ff) == 0x7c0007ec) {
unsigned clsz = rtems_cache_get_data_line_size();
unsigned a = (opcode >> 16) & 0x1f;
unsigned b = (opcode >> 11) & 0x1f;
PPC_GPR_TYPE *regs = &frame->GPR0;
unsigned *current = (unsigned *)
(((a == 0 ? 0 : (unsigned) regs[a]) + (unsigned) regs[b]) & (clsz - 1));
unsigned *end = current + clsz / sizeof(*current);
while (current != end) {
*current = 0;
++current;
}
frame->EXC_SRR0 += 4;
return 0;
} else {
return -1;
}
}
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