You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
184 lines
5.5 KiB
184 lines
5.5 KiB
/*
|
|
* (C) Copyright 2001
|
|
* Erik Theisen, Wave 7 Optics, etheisen@mindspring.com
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
#include <asm/ppc4xx.h>
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* XXX - DANGER
|
|
* These routines make use of self modifying code. DO NOT CALL THEM
|
|
* UNTIL THEY ARE RELOCATED TO RAM. Additionally, I do not
|
|
* recommend them for use in anything other than an interactive
|
|
* debugging environment. This is mainly due to performance reasons.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/*
|
|
* static void _create_MFDCR(unsigned short dcrn)
|
|
*
|
|
* Builds a 'mfdcr' instruction for get_dcr
|
|
* function.
|
|
*/
|
|
.section ".text"
|
|
.align 2
|
|
.type _create_MFDCR,@function
|
|
_create_MFDCR:
|
|
/*
|
|
* Build up a 'mfdcr' instruction formatted as follows:
|
|
*
|
|
* OPCD | RT | DCRF | XO | CR |
|
|
* ---------------|--------------|--------------|----|
|
|
* 0 5 | 6 10 | 11 20 | 21 30 | 31 |
|
|
* | | DCRN | | |
|
|
* 31 | %r3 | (5..9|0..4) | 323 | 0 |
|
|
*
|
|
* Where:
|
|
* OPCD = opcode - 31
|
|
* RT = destination register - %r3 return register
|
|
* DCRF = DCRN # with upper and lower halves swapped
|
|
* XO = extended opcode - 323
|
|
* CR = CR[CR0] NOT undefined - 0
|
|
*/
|
|
rlwinm r0, r3, 27, 27, 31 /* OPCD = 31 */
|
|
rlwinm r3, r3, 5, 22, 26
|
|
or r3, r3, r0
|
|
slwi r3, r3, 10
|
|
oris r3, r3, 0x3e30 /* RT = %r3 */
|
|
ori r3, r3, 323 /* XO = 323 */
|
|
slwi r3, r3, 1 /* CR = 0 */
|
|
|
|
mflr r4
|
|
stw r3, 0(r4) /* Store instr in get_dcr() */
|
|
dcbst r0, r4 /* Make sure val is written out */
|
|
sync /* Wait for write to complete */
|
|
icbi r0, r4 /* Make sure old instr is dumped */
|
|
isync /* Wait for icbi to complete */
|
|
|
|
blr
|
|
.Lfe1: .size _create_MFDCR,.Lfe1-_create_MFDCR
|
|
/* end _create_MFDCR() */
|
|
|
|
/*
|
|
* static void _create_MTDCR(unsigned short dcrn, unsigned long value)
|
|
*
|
|
* Builds a 'mtdcr' instruction for set_dcr
|
|
* function.
|
|
*/
|
|
.section ".text"
|
|
.align 2
|
|
.type _create_MTDCR,@function
|
|
_create_MTDCR:
|
|
/*
|
|
* Build up a 'mtdcr' instruction formatted as follows:
|
|
*
|
|
* OPCD | RS | DCRF | XO | CR |
|
|
* ---------------|--------------|--------------|----|
|
|
* 0 5 | 6 10 | 11 20 | 21 30 | 31 |
|
|
* | | DCRN | | |
|
|
* 31 | %r3 | (5..9|0..4) | 451 | 0 |
|
|
*
|
|
* Where:
|
|
* OPCD = opcode - 31
|
|
* RS = source register - %r4
|
|
* DCRF = dest. DCRN # with upper and lower halves swapped
|
|
* XO = extended opcode - 451
|
|
* CR = CR[CR0] NOT undefined - 0
|
|
*/
|
|
rlwinm r0, r3, 27, 27, 31 /* OPCD = 31 */
|
|
rlwinm r3, r3, 5, 22, 26
|
|
or r3, r3, r0
|
|
slwi r3, r3, 10
|
|
oris r3, r3, 0x3e40 /* RS = %r4 */
|
|
ori r3, r3, 451 /* XO = 451 */
|
|
slwi r3, r3, 1 /* CR = 0 */
|
|
|
|
mflr r5
|
|
stw r3, 0(r5) /* Store instr in set_dcr() */
|
|
dcbst r0, r5 /* Make sure val is written out */
|
|
sync /* Wait for write to complete */
|
|
icbi r0, r5 /* Make sure old instr is dumped */
|
|
isync /* Wait for icbi to complete */
|
|
|
|
blr
|
|
.Lfe2: .size _create_MTDCR,.Lfe2-_create_MTDCR
|
|
/* end _create_MTDCR() */
|
|
|
|
|
|
/*
|
|
* unsigned long get_dcr(unsigned short dcrn)
|
|
*
|
|
* Return a given DCR's value.
|
|
*/
|
|
/* */
|
|
/* XXX - This is self modifying code, hence */
|
|
/* it is in the data section. */
|
|
/* */
|
|
.section ".text"
|
|
.align 2
|
|
.globl get_dcr
|
|
.type get_dcr,@function
|
|
get_dcr:
|
|
mflr r0 /* Get link register */
|
|
stwu r1, -32(r1) /* Save back chain and move SP */
|
|
stw r0, +36(r1) /* Save link register */
|
|
|
|
bl _create_MFDCR /* Build following instruction */
|
|
/* XXX - we build this instuction up on the fly. */
|
|
.long 0 /* Get DCR's value */
|
|
|
|
lwz r0, +36(r1) /* Get saved link register */
|
|
mtlr r0 /* Restore link register */
|
|
addi r1, r1, +32 /* Remove frame from stack */
|
|
blr /* Return to calling function */
|
|
.Lfe3: .size get_dcr,.Lfe3-get_dcr
|
|
/* end get_dcr() */
|
|
|
|
|
|
/*
|
|
* unsigned void set_dcr(unsigned short dcrn, unsigned long value)
|
|
*
|
|
* Return a given DCR's value.
|
|
*/
|
|
/*
|
|
* XXX - This is self modifying code, hence
|
|
* it is in the data section.
|
|
*/
|
|
.section ".text"
|
|
.align 2
|
|
.globl set_dcr
|
|
.type set_dcr,@function
|
|
set_dcr:
|
|
mflr r0 /* Get link register */
|
|
stwu r1, -32(r1) /* Save back chain and move SP */
|
|
stw r0, +36(r1) /* Save link register */
|
|
|
|
bl _create_MTDCR /* Build following instruction */
|
|
/* XXX - we build this instuction up on the fly. */
|
|
.long 0 /* Set DCR's value */
|
|
|
|
lwz r0, +36(r1) /* Get saved link register */
|
|
mtlr r0 /* Restore link register */
|
|
addi r1, r1, +32 /* Remove frame from stack */
|
|
blr /* Return to calling function */
|
|
.Lfe4: .size set_dcr,.Lfe4-set_dcr
|
|
/* end set_dcr() */
|
|
|
|
|