[people/ms/u-boot.git] / arch / powerpc / cpu / ppc4xx / dcr.S

/*
 * (C) Copyright 2001
 * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
#include <config.h>

#if defined(CONFIG_4xx) && defined(CONFIG_CMD_SETGETDCR)

#include <asm/ppc4xx.h>

#include <ppc_asm.tmpl>
#include <ppc_defs.h>

#include <asm/cache.h>
#include <asm/mmu.h>

#define _ASMLANGUAGE

/*****************************************************************************
 *
 *  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 ".data"
		.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 ".data"
		.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() */
#endif
Commit	Line	Data
c74078f8 WD	1	/*
	2	* (C) Copyright 2001
	3	* Erik Theisen, Wave 7 Optics, etheisen@mindspring.com
	4	*
3765b3e7	5	* SPDX-License-Identifier: GPL-2.0+
c74078f8 WD	6	*/
	7	#include <config.h>
	8
3a1ed1e1	9	#if defined(CONFIG_4xx) && defined(CONFIG_CMD_SETGETDCR)
c74078f8	10
b36df561	11	#include <asm/ppc4xx.h>
c74078f8	12
c74078f8 WD	13	#include <ppc_asm.tmpl>
	14	#include <ppc_defs.h>
	15
	16	#include <asm/cache.h>
	17	#include <asm/mmu.h>
	18
	19	#define _ASMLANGUAGE
	20
	21	/*****************************************************************************
	22	*
	23	* XXX - DANGER
	24	* These routines make use of self modifying code. DO NOT CALL THEM
	25	* UNTIL THEY ARE RELOCATED TO RAM. Additionally, I do not
	26	* recommend them for use in anything other than an interactive
	27	* debugging environment. This is mainly due to performance reasons.
	28	*
	29	****************************************************************************/
	30
	31	/*
	32	* static void _create_MFDCR(unsigned short dcrn)
	33	*
	34	* Builds a 'mfdcr' instruction for get_dcr
	35	* function.
	36	*/
	37	.section ".text"
	38	.align 2
	39	.type _create_MFDCR,@function
	40	_create_MFDCR:
	41	/*
	42	* Build up a 'mfdcr' instruction formatted as follows:
	43	*
	44	* OPCD \| RT \| DCRF \| XO \| CR \|
	45	* ---------------\|--------------\|--------------\|----\|
	46	* 0 5 \| 6 10 \| 11 20 \| 21 30 \| 31 \|
	47	* \| \| DCRN \| \| \|
	48	* 31 \| %r3 \| (5..9\|0..4) \| 323 \| 0 \|
	49	*
	50	* Where:
	51	* OPCD = opcode - 31
	52	* RT = destination register - %r3 return register
	53	* DCRF = DCRN # with upper and lower halves swapped
	54	* XO = extended opcode - 323
	55	* CR = CR[CR0] NOT undefined - 0
	56	*/
	57	rlwinm r0, r3, 27, 27, 31 /* OPCD = 31 */
	58	rlwinm r3, r3, 5, 22, 26
	59	or r3, r3, r0
	60	slwi r3, r3, 10
	61	oris r3, r3, 0x3e30 /* RT = %r3 */
	62	ori r3, r3, 323 /* XO = 323 */
	63	slwi r3, r3, 1 /* CR = 0 */
	64
	65	mflr r4
	66	stw r3, 0(r4) /* Store instr in get_dcr() */
	67	dcbst r0, r4 /* Make sure val is written out */
	68	sync /* Wait for write to complete */
	69	icbi r0, r4 /* Make sure old instr is dumped */
	70	isync /* Wait for icbi to complete */
	71
	72	blr
	73	.Lfe1: .size _create_MFDCR,.Lfe1-_create_MFDCR
	74	/* end _create_MFDCR() */
	75
	76	/*
77	* static void _create_MTDCR(unsigned short dcrn, unsigned long value)
78	*
79	* Builds a 'mtdcr' instruction for set_dcr
80	* function.
81	*/
82	.section ".text"
83	.align 2
84	.type _create_MTDCR,@function
85	_create_MTDCR:
86	/*
87	* Build up a 'mtdcr' instruction formatted as follows:
88	*
89	* OPCD \| RS \| DCRF \| XO \| CR \|
90	* ---------------\|--------------\|--------------\|----\|
91	* 0 5 \| 6 10 \| 11 20 \| 21 30 \| 31 \|
92	* \| \| DCRN \| \| \|
93	* 31 \| %r3 \| (5..9\|0..4) \| 451 \| 0 \|
94	*
95	* Where:
96	* OPCD = opcode - 31
97	* RS = source register - %r4
98	* DCRF = dest. DCRN # with upper and lower halves swapped
99	* XO = extended opcode - 451
100	* CR = CR[CR0] NOT undefined - 0
101	*/
102	rlwinm r0, r3, 27, 27, 31 /* OPCD = 31 */
103	rlwinm r3, r3, 5, 22, 26
104	or r3, r3, r0
105	slwi r3, r3, 10
106	oris r3, r3, 0x3e40 /* RS = %r4 */
107	ori r3, r3, 451 /* XO = 451 */
108	slwi r3, r3, 1 /* CR = 0 */
109
110	mflr r5
111	stw r3, 0(r5) /* Store instr in set_dcr() */
112	dcbst r0, r5 /* Make sure val is written out */
113	sync /* Wait for write to complete */
114	icbi r0, r5 /* Make sure old instr is dumped */
115	isync /* Wait for icbi to complete */
116
117	blr
118	.Lfe2: .size _create_MTDCR,.Lfe2-_create_MTDCR
119	/* end _create_MTDCR() */
120
121
122	/*
123	* unsigned long get_dcr(unsigned short dcrn)
124	*
125	* Return a given DCR's value.
126	*/
127	/* */
128	/* XXX - This is self modifying code, hence */
129	/* it is in the data section. */
130	/* */
131	.section ".data"
132	.align 2
133	.globl get_dcr
134	.type get_dcr,@function
135	get_dcr:
136	mflr r0 /* Get link register */
137	stwu r1, -32(r1) /* Save back chain and move SP */
138	stw r0, +36(r1) /* Save link register */
139
140	bl _create_MFDCR /* Build following instruction */
141	/* XXX - we build this instuction up on the fly. */
142	.long 0 /* Get DCR's value */
143
144	lwz r0, +36(r1) /* Get saved link register */
145	mtlr r0 /* Restore link register */
146	addi r1, r1, +32 /* Remove frame from stack */
147	blr /* Return to calling function */
148	.Lfe3: .size get_dcr,.Lfe3-get_dcr
149	/* end get_dcr() */
150
151
152	/*
153	* unsigned void set_dcr(unsigned short dcrn, unsigned long value)
154	*
155	* Return a given DCR's value.
156	*/
157	/*
158	* XXX - This is self modifying code, hence
159	* it is in the data section.
160	*/
161	.section ".data"
162	.align 2
163	.globl set_dcr
164	.type set_dcr,@function
165	set_dcr:
166	mflr r0 /* Get link register */
167	stwu r1, -32(r1) /* Save back chain and move SP */
168	stw r0, +36(r1) /* Save link register */
169
170	bl _create_MTDCR /* Build following instruction */
171	/* XXX - we build this instuction up on the fly. */
172	.long 0 /* Set DCR's value */
173
174	lwz r0, +36(r1) /* Get saved link register */
175	mtlr r0 /* Restore link register */
176	addi r1, r1, +32 /* Remove frame from stack */
177	blr /* Return to calling function */
178	.Lfe4: .size set_dcr,.Lfe4-set_dcr
179	/* end set_dcr() */
068b60a0	180	#endif