[apple/xnu.git] / osfmk / ppc / bat_init.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
#include <mach/std_types.h>
#include <ppc/proc_reg.h>
#include <ppc/boot.h>
#include <ppc/mem.h>

// The sophisticated BAT manager

unsigned int mappedSegments = 0;
unsigned int availableBATs = 0xE;		// BAT0 used, 1-3 available

vm_offset_t
PEResidentAddress( vm_offset_t address, vm_size_t length )
{
    if( mappedSegments & (1 << (15 & (address >> 28))))
	return( address);
    else
	return( 0);
}

vm_offset_t
PEMapSegment( vm_offset_t address, vm_size_t length )
{
    vm_offset_t		retAddress;
    bat_t		bat;
    int			batNum;

    retAddress = PEResidentAddress( address, length );
    if( retAddress)
	return( retAddress);

    if( length < (256 * 1024))
	return( 0);
    if( availableBATs == 0)
	return( 0);

    for( batNum = 0;
	 (0 == (availableBATs & (1 << batNum)));
	 batNum++);

    bat.upper.word	     = address & 0xf0000000;
    bat.lower.word	     = bat.upper.word;

    bat.upper.bits.bl    = 0x7ff;	/* size = 256M */
    bat.upper.bits.vs    = 1;
    bat.upper.bits.vp    = 0;		/* user disabled */

    bat.lower.bits.wimg  = PTE_WIMG_IO;
    bat.lower.bits.pp    = 2;		/* read/write access */
    
    // Update the shadow bats.
    shadow_BAT.DBATs[batNum].upper = bat.upper.word;
    shadow_BAT.DBATs[batNum].lower = bat.lower.word;
    
    sync();isync();
    switch( batNum) {			// !%$@!! mtdbat needs literal
	case 0:
	    mtdbatu( 0, BAT_INVALID); 	/* invalidate old mapping */
	    mtdbatl( 0, bat.lower.word);
	    mtdbatu( 0, bat.upper.word);
	    break;
	case 1:
	    mtdbatu( 1, BAT_INVALID);
	    mtdbatl( 1, bat.lower.word);
	    mtdbatu( 1, bat.upper.word);
	    break;
	case 2:
	    mtdbatu( 2, BAT_INVALID);
	    mtdbatl( 2, bat.lower.word);
	    mtdbatu( 2, bat.upper.word);
	    break;
	case 3:
	    mtdbatu( 3, BAT_INVALID);
	    mtdbatl( 3, bat.lower.word);
	    mtdbatu( 3, bat.upper.word);
	    break;
    }
    sync();isync();

    availableBATs &= ~(1 << batNum);
    mappedSegments |= (1 << (15 & (address >> 28)));

    return( address);
}

void initialize_bats(boot_args *args)
{
	int i;

	/* Give ourselves the virtual map that we would like */
	bat_t		      bat;

	/* Make sure that the BATs map what we expect. Note
	 * that we assume BAT0 maps kernel text & data.
	 *
	 * Except, oops, none of the BATs have ever been set.
	 * Developer worked only by fluke.
	 */

	bat.upper.word	     = 0;
	bat.upper.bits.bepi  = 0x0;	/* start at logical addr 0M */
	/*
	 * We should be smarter here about picking an
	 * amount to map
	 */
	bat.upper.bits.bl    = 0x7ff;	/* size = 256M */
	bat.upper.bits.vs    = 1;
	bat.upper.bits.vp    = 0;

	bat.lower.word       = 0;
	bat.lower.bits.brpn  = 0x0;	/* start at physical addr 0 */
	bat.lower.bits.wimg  = PTE_WIMG_DEFAULT;
	bat.lower.bits.pp    = 2;	/* read/write access */

	/* Mustn't cause any data traffic here,
	 * we're modifying our data BAT register!
	 */

	sync();
	mtdbatu(0, BAT_INVALID);	/* invalidate old mapping */
	isync();
	mtdbatl(0, bat.lower.word);
	isync();
	mtdbatu(0, bat.upper.word);	/* update with new mapping */
	isync();
	mtibatl(0, bat.lower.word);
	isync();
	mtibatu(0, bat.upper.word);	/* update with new mapping */
	isync();

	sync();isync();
	mtdbatu(1,BAT_INVALID); mtdbatl(1,BAT_INVALID);
	mtibatu(1,BAT_INVALID); mtibatl(1,BAT_INVALID);
	mtdbatu(2,BAT_INVALID); mtdbatl(2,BAT_INVALID);
	mtibatu(2,BAT_INVALID); mtibatl(2,BAT_INVALID);
	mtdbatu(3,BAT_INVALID); mtdbatl(3,BAT_INVALID);
	mtibatu(3,BAT_INVALID); mtibatl(3,BAT_INVALID);
	sync();isync();

	PEMapSegment( 0xf0000000, 0x10000000);
	if( args->Video.v_baseAddr)
	  PEMapSegment( args->Video.v_baseAddr, 0x10000000);

	/* Set up segment registers as VM through space 0 */
	isync();
	for (i=0; i<=15; i++) {
	  mtsrin(KERNEL_SEG_REG0_VALUE | i, i * 0x10000000);
	}
	isync();
}

/*
 * Adjust the size of the region mapped by a BAT
 * to to be just large enough to include the specified
 * offset, and return the offset of the new end of the region.
 * Note that both 'offsets' are really *lengths*, i.e. the
 * offset of the end of the mapped region from the beginning.
 * Either the instruction or data BATs (or both) can be specified.
 * If the new length is greater than the size mappable by a BAT,
 * then that value is just returned and no changes are made.
 */
vm_offset_t
adjust_bat_limit(
    vm_offset_t		new_minimum,
    int			batn,
    boolean_t		ibat,
    boolean_t		dbat
)
{
    vm_offset_t		new_limit;

    if (new_minimum <= 256*1024*1024) {
	unsigned int	bl = 0;

	new_limit = 128*1024;
	while (new_limit < new_minimum) {
	    new_limit *= 2;
	    bl = (bl << 1) | 1;
	}

	{
	    batu_t	batu;

	    if (dbat) switch (batn) {

	    case 0:
		mfdbatu(batu, 0 );
		batu.bits.bl = bl;

		sync(); isync();
		mtdbatu( 0, batu);
		sync(); isync();

		break;

	    case 1:
		mfdbatu(batu, 1 );
		batu.bits.bl = bl;

		sync(); isync();
		mtdbatu( 1, batu);
		sync(); isync();

		break;

	    case 2:
		mfdbatu(batu, 2 );
		batu.bits.bl = bl;

		sync(); isync();
		mtdbatu( 2, batu);
		sync(); isync();

		break;

	    case 3:
		mfdbatu(batu, 3 );
		batu.bits.bl = bl;

		sync(); isync();
		mtdbatu( 3, batu);
		sync(); isync();

		break;
	    }

	    if (ibat) switch (batn) {

	    case 0:
		mfibatu(batu, 0 );
		batu.bits.bl = bl;

		sync(); isync();
		mtibatu( 0, batu);
		sync(); isync();

		break;

	    case 1:
		mfibatu(batu, 1 );
		batu.bits.bl = bl;

		sync(); isync();
		mtibatu( 1, batu);
		sync(); isync();

		break;

	    case 2:
		mfibatu(batu, 2 );
		batu.bits.bl = bl;

		sync(); isync();
		mtibatu( 2, batu);
		sync(); isync();

		break;

	    case 3:
		mfibatu(batu, 3 );
		batu.bits.bl = bl;

		sync(); isync();
		mtibatu( 3, batu);
		sync(); isync();

		break;
	    }
	}
    }
    else
	new_limit = new_minimum;

    return (new_limit);
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
e5568f75 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
e5568f75 A	12	* This Original Code and all software distributed under the License are
e5568f75 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
e5568f75 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	#include <mach/std_types.h>
	23	#include <ppc/proc_reg.h>
	24	#include <ppc/boot.h>
	25	#include <ppc/mem.h>
	26
1c79356b A	27	// The sophisticated BAT manager
	28
	29	unsigned int mappedSegments = 0;
	30	unsigned int availableBATs = 0xE; // BAT0 used, 1-3 available
	31
	32	vm_offset_t
	33	PEResidentAddress( vm_offset_t address, vm_size_t length )
	34	{
	35	if( mappedSegments & (1 << (15 & (address >> 28))))
	36	return( address);
	37	else
	38	return( 0);
	39	}
	40
	41	vm_offset_t
	42	PEMapSegment( vm_offset_t address, vm_size_t length )
	43	{
	44	vm_offset_t retAddress;
	45	bat_t bat;
	46	int batNum;
	47
	48	retAddress = PEResidentAddress( address, length );
	49	if( retAddress)
	50	return( retAddress);
	51
	52	if( length < (256 * 1024))
	53	return( 0);
	54	if( availableBATs == 0)
	55	return( 0);
	56
	57	for( batNum = 0;
	58	(0 == (availableBATs & (1 << batNum)));
	59	batNum++);
	60
	61	bat.upper.word = address & 0xf0000000;
	62	bat.lower.word = bat.upper.word;
	63
	64	bat.upper.bits.bl = 0x7ff; /* size = 256M */
	65	bat.upper.bits.vs = 1;
	66	bat.upper.bits.vp = 0; /* user disabled */
	67
	68	bat.lower.bits.wimg = PTE_WIMG_IO;
	69	bat.lower.bits.pp = 2; /* read/write access */
	70
	71	// Update the shadow bats.
	72	shadow_BAT.DBATs[batNum].upper = bat.upper.word;
	73	shadow_BAT.DBATs[batNum].lower = bat.lower.word;
	74
	75	sync();isync();
	76	switch( batNum) { // !%$@!! mtdbat needs literal
	77	case 0:
	78	mtdbatu( 0, BAT_INVALID); /* invalidate old mapping */
	79	mtdbatl( 0, bat.lower.word);
	80	mtdbatu( 0, bat.upper.word);
	81	break;
	82	case 1:
	83	mtdbatu( 1, BAT_INVALID);
	84	mtdbatl( 1, bat.lower.word);
	85	mtdbatu( 1, bat.upper.word);
	86	break;
	87	case 2:
	88	mtdbatu( 2, BAT_INVALID);
	89	mtdbatl( 2, bat.lower.word);
	90	mtdbatu( 2, bat.upper.word);
91	break;
92	case 3:
93	mtdbatu( 3, BAT_INVALID);
94	mtdbatl( 3, bat.lower.word);
95	mtdbatu( 3, bat.upper.word);
96	break;
97	}
98	sync();isync();
99
100	availableBATs &= ~(1 << batNum);
101	mappedSegments \|= (1 << (15 & (address >> 28)));
102
103	return( address);
104	}
105
106	void initialize_bats(boot_args *args)
107	{
108	int i;
109
110	/* Give ourselves the virtual map that we would like */
111	bat_t bat;
112
113	/* Make sure that the BATs map what we expect. Note
114	* that we assume BAT0 maps kernel text & data.
115	*
116	* Except, oops, none of the BATs have ever been set.
117	* Developer worked only by fluke.
118	*/
119
120	bat.upper.word = 0;
121	bat.upper.bits.bepi = 0x0; /* start at logical addr 0M */
122	/*
123	* We should be smarter here about picking an
124	* amount to map
125	*/
126	bat.upper.bits.bl = 0x7ff; /* size = 256M */
127	bat.upper.bits.vs = 1;
128	bat.upper.bits.vp = 0;
129
130	bat.lower.word = 0;
131	bat.lower.bits.brpn = 0x0; /* start at physical addr 0 */
132	bat.lower.bits.wimg = PTE_WIMG_DEFAULT;
133	bat.lower.bits.pp = 2; /* read/write access */
134
135	/* Mustn't cause any data traffic here,
136	* we're modifying our data BAT register!
137	*/
138
139	sync();
140	mtdbatu(0, BAT_INVALID); /* invalidate old mapping */
141	isync();
142	mtdbatl(0, bat.lower.word);
143	isync();
144	mtdbatu(0, bat.upper.word); /* update with new mapping */
145	isync();
146	mtibatl(0, bat.lower.word);
147	isync();
148	mtibatu(0, bat.upper.word); /* update with new mapping */
149	isync();
150
151	sync();isync();
152	mtdbatu(1,BAT_INVALID); mtdbatl(1,BAT_INVALID);
153	mtibatu(1,BAT_INVALID); mtibatl(1,BAT_INVALID);
154	mtdbatu(2,BAT_INVALID); mtdbatl(2,BAT_INVALID);
155	mtibatu(2,BAT_INVALID); mtibatl(2,BAT_INVALID);
156	mtdbatu(3,BAT_INVALID); mtdbatl(3,BAT_INVALID);
157	mtibatu(3,BAT_INVALID); mtibatl(3,BAT_INVALID);
158	sync();isync();
159
160	PEMapSegment( 0xf0000000, 0x10000000);
161	if( args->Video.v_baseAddr)
162	PEMapSegment( args->Video.v_baseAddr, 0x10000000);
163
164	/* Set up segment registers as VM through space 0 */
165	isync();
166	for (i=0; i<=15; i++) {
167	mtsrin(KERNEL_SEG_REG0_VALUE \| i, i * 0x10000000);
168	}
169	isync();
170	}
171
172	/*
173	* Adjust the size of the region mapped by a BAT
174	* to to be just large enough to include the specified
175	* offset, and return the offset of the new end of the region.
176	* Note that both 'offsets' are really lengths, i.e. the
177	* offset of the end of the mapped region from the beginning.
178	* Either the instruction or data BATs (or both) can be specified.
179	* If the new length is greater than the size mappable by a BAT,
180	* then that value is just returned and no changes are made.
181	*/
182	vm_offset_t
183	adjust_bat_limit(
184	vm_offset_t new_minimum,
185	int batn,
186	boolean_t ibat,
187	boolean_t dbat
188	)
189	{
190	vm_offset_t new_limit;
191
192	if (new_minimum <= 25610241024) {
193	unsigned int bl = 0;
194
195	new_limit = 128*1024;
196	while (new_limit < new_minimum) {
197	new_limit *= 2;
198	bl = (bl << 1) \| 1;
199	}
200
201	{
202	batu_t batu;
203
204	if (dbat) switch (batn) {
205
206	case 0:
207	mfdbatu(batu, 0 );
208	batu.bits.bl = bl;
209
210	sync(); isync();
211	mtdbatu( 0, batu);
212	sync(); isync();
213
214	break;
215
216	case 1:
217	mfdbatu(batu, 1 );
218	batu.bits.bl = bl;
219
220	sync(); isync();
221	mtdbatu( 1, batu);
222	sync(); isync();
223
224	break;
225
226	case 2:
227	mfdbatu(batu, 2 );
228	batu.bits.bl = bl;
229
230	sync(); isync();
231	mtdbatu( 2, batu);
232	sync(); isync();
233
234	break;
235
236	case 3:
237	mfdbatu(batu, 3 );
238	batu.bits.bl = bl;
239
240	sync(); isync();
241	mtdbatu( 3, batu);
242	sync(); isync();
243
244	break;
245	}
246
247	if (ibat) switch (batn) {
248
249	case 0:
250	mfibatu(batu, 0 );
251	batu.bits.bl = bl;
252
253	sync(); isync();
254	mtibatu( 0, batu);
255	sync(); isync();
256
257	break;
258
259	case 1:
260	mfibatu(batu, 1 );
261	batu.bits.bl = bl;
262
263	sync(); isync();
264	mtibatu( 1, batu);
265	sync(); isync();
266
267	break;
268
269	case 2:
270	mfibatu(batu, 2 );
271	batu.bits.bl = bl;
272
273	sync(); isync();
274	mtibatu( 2, batu);
275	sync(); isync();
276
277	break;
278
279	case 3:
280	mfibatu(batu, 3 );
281	batu.bits.bl = bl;
282
283	sync(); isync();
284	mtibatu( 3, batu);
285	sync(); isync();
286
287	break;
288	}
289	}
290	}
291	else
292	new_limit = new_minimum;
293
294	return (new_limit);
295	}