1 /* This file is part of the program psim.
3 Copyright 1994, 1995, 1996, 2003, 2004 Andrew Cagney
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include "device_table.h"
33 htab - pseudo-device describing a PowerPC hash table
39 During the initialization of the device tree, the pseudo-device
40 <<htab>>, in conjunction with any child <<pte>> pseudo-devices,
41 will create a PowerPC hash table in memory. The hash table values
42 are written using dma transfers.
44 The size and address of the hash table are determined by properties
47 By convention, the htab device is made a child of the
48 <</openprom/init>> node.
50 By convention, the real address of the htab is used as the htab
57 real-address = <address> (required)
59 The physical address of the hash table. The PowerPC architecture
60 places limitations on what is a valid hash table real-address.
63 nr-bytes = <size> (required)
65 The size of the hash table (in bytes) that is to be created at
66 <<real-address>>. The PowerPC architecture places limitations on
67 what is a valid hash table size.
70 claim = <anything> (optional)
72 If this property is present, the memory used to construct the hash
73 table will be claimed from the memory device. The memory device
74 being specified by the <</chosen/memory>> ihandle property.
81 | $ psim -t htab-device \
84 Create a htab specifying the base address and minimum size.
86 | -o '/openprom/init/htab@0x10000/real-address 0x10000' \
87 | -o '/openprom/init/htab@0x10000/claim 0' \
88 | -o '/openprom/init/htab@0x10000/nr-bytes 65536' \
94 See the <<pte>> device.
103 pte - pseudo-device describing a htab entry
109 The <<pte>> pseudo-device, which must be a child of a <<htabl>>
110 node, describes a virtual to physical mapping that is to be entered
111 into the parents hash table.
113 Two alternative specifications of the mapping are allowed. Either
114 a section of physical memory can be mapped to a virtual address, or
115 the header of an executible image can be used to define the
118 By convention, the real address of the map is specified as the pte
119 devices unit address.
125 real-address = <address> (required)
127 The starting physical address that is to be mapped by the hash
131 wimg = <int> (required)
132 pp = <int> (required)
134 The value of hash table protection bits that are to be used when
135 creating the virtual to physical address map.
138 claim = <anything> (optional)
140 If this property is present, the real memory that is being mapped by the
141 hash table will be claimed from the memory node (specified by the
142 ihandle <</chosen/memory>>).
145 virtual-address = <integer> [ <integer> ] (option A)
146 nr-bytes = <size> (option A)
148 Option A - Virtual virtual address (and size) at which the physical
149 address is to be mapped. If multiple values are specified for the
150 virtual address then they are concatenated to gether to form a
151 longer virtual address.
154 file-name = <string> (option B)
156 Option B - An executable image that is to be loaded (starting at
157 the physical address specified above) and then mapped in using
158 informatioin taken from the executables header. information found
165 Enable tracing (note that both the <<htab>> and <<pte>> device use the
171 Map a block of physical memory into a specified virtual address:
173 | -o '/openprom/init/htab/pte@0x0/real-address 0' \
174 | -o '/openprom/init/htab/pte@0x0/nr-bytes 4096' \
175 | -o '/openprom/init/htab/pte@0x0/virtual-address 0x1000000' \
176 | -o '/openprom/init/htab/pte@0x0/claim 0' \
177 | -o '/openprom/init/htab/pte@0x0/wimg 0x7' \
178 | -o '/openprom/init/htab/pte@0x0/pp 0x2' \
181 Map a file into memory.
183 | -o '/openprom/init/htab/pte@0x10000/real-address 0x10000' \
184 | -o '/openprom/init/htab/pte@0x10000/file-name "netbsd.elf' \
185 | -o '/openprom/init/htab/pte@0x10000/wimg 0x7' \
186 | -o '/openprom/init/htab/pte@0x10000/pp 0x2' \
192 For an ELF executable, the header defines both the virtual and real
193 address at which each file section should be loaded. At present, the
194 real addresses that are specified in the header are ignored, the file
195 instead being loaded in to physical memory in a linear fashion.
197 When claiming memory, this device assumes that the #address-cells
198 and #size-cells is one. For future implementations, this may not
206 htab_decode_hash_table(device *me,
208 unsigned32 *htabmask)
210 unsigned_word htab_ra;
211 unsigned htab_nr_bytes;
213 device *parent = device_parent(me);
214 /* determine the location/size of the hash table */
216 || strcmp(device_name(parent), "htab") != 0)
217 device_error(parent, "must be a htab device");
218 htab_ra = device_find_integer_property(parent, "real-address");
219 htab_nr_bytes = device_find_integer_property(parent, "nr-bytes");
220 if (htab_nr_bytes < 0x10000) {
221 device_error(parent, "htab size 0x%x less than 0x1000",
224 for (n = htab_nr_bytes; n > 1; n = n / 2) {
226 device_error(parent, "htab size 0x%x not a power of two",
230 /* Position the HTABMASK ready for use against a hashed address and
231 not ready for insertion into SDR1.HTABMASK. */
232 *htabmask = MASKED32(htab_nr_bytes - 1, 7, 31-6);
233 /* Check that the MASK and ADDRESS do not overlap. */
234 if ((htab_ra & (*htabmask)) != 0) {
235 device_error(parent, "htaborg 0x%lx not aligned to htabmask 0x%lx",
236 (unsigned long)*htaborg, (unsigned long)*htabmask);
238 DTRACE(htab, ("htab - htaborg=0x%lx htabmask=0x%lx\n",
239 (unsigned long)*htaborg, (unsigned long)*htabmask));
243 htab_map_page(device *me,
251 /* keep everything left shifted so that the numbering is easier */
252 unsigned64 vpn = va << 12;
253 unsigned32 vsid = INSERTED32(EXTRACTED64(vpn, 0, 23), 0, 23);
254 unsigned32 vpage = INSERTED32(EXTRACTED64(vpn, 24, 39), 0, 15);
255 unsigned32 hash = INSERTED32(EXTRACTED32(vsid, 5, 23)
256 ^ EXTRACTED32(vpage, 0, 15),
259 for (h = 0; h < 2; h++) {
260 unsigned32 pteg = (htaborg | (hash & htabmask));
262 for (pti = 0; pti < 8; pti++) {
263 unsigned32 pte = pteg + 8 * pti;
264 unsigned32 current_target_pte0;
265 unsigned32 current_pte0;
266 if (device_dma_read_buffer(device_parent(me),
267 ¤t_target_pte0,
270 sizeof(current_target_pte0)) != 4)
271 device_error(me, "failed to read a pte at 0x%lx", (unsigned long)pte);
272 current_pte0 = T2H_4(current_target_pte0);
273 if (MASKED32(current_pte0, 0, 0)) {
274 /* full pte, check it isn't already mapping the same virtual
276 unsigned32 curr_vsid = INSERTED32(EXTRACTED32(current_pte0, 1, 24), 0, 23);
277 unsigned32 curr_api = INSERTED32(EXTRACTED32(current_pte0, 26, 31), 0, 5);
278 unsigned32 curr_h = EXTRACTED32(current_pte0, 25, 25);
281 && curr_api == MASKED32(vpage, 0, 5))
282 device_error(me, "duplicate map - va=0x%08lx ra=0x%lx vsid=0x%lx h=%d vpage=0x%lx hash=0x%lx pteg=0x%lx+%2d pte0=0x%lx",
287 (unsigned long)vpage,
291 (unsigned long)current_pte0);
294 /* empty pte fill it */
295 unsigned32 pte0 = (MASK32(0, 0)
296 | INSERTED32(EXTRACTED32(vsid, 0, 23), 1, 24)
297 | INSERTED32(h, 25, 25)
298 | INSERTED32(EXTRACTED32(vpage, 0, 5), 26, 31));
299 unsigned32 target_pte0 = H2T_4(pte0);
300 unsigned32 pte1 = (INSERTED32(EXTRACTED32(ra, 0, 19), 0, 19)
301 | INSERTED32(wimg, 25, 28)
302 | INSERTED32(pp, 30, 31));
303 unsigned32 target_pte1 = H2T_4(pte1);
304 if (device_dma_write_buffer(device_parent(me),
310 || device_dma_write_buffer(device_parent(me),
316 device_error(me, "failed to write a pte a 0x%lx", (unsigned long)pte);
317 DTRACE(htab, ("map - va=0x%08lx ra=0x%lx vsid=0x%lx h=%d vpage=0x%lx hash=0x%lx pteg=0x%lx+%2d pte0=0x%lx pte1=0x%lx\n",
322 (unsigned long)vpage,
327 (unsigned long)pte1));
332 hash = MASKED32(~hash, 0, 18);
337 claim_memory(device *me,
338 device_instance *memory,
343 unsigned32 results[1];
345 args[0] = 0; /* alignment */
348 status = device_instance_call_method(memory, "claim", 3, args, 1, results);
350 device_error(me, "failed to claim memory");
355 htab_map_region(device *me,
356 device_instance *memory,
357 unsigned_word pte_ra,
367 /* claim the memory */
369 claim_memory(me, memory, pte_ra, nr_bytes);
370 /* go through all pages and create a pte for each */
371 for (ra = pte_ra, va = pte_va;
372 ra < pte_ra + nr_bytes;
373 ra += 0x1000, va += 0x1000) {
374 htab_map_page(me, ra, va, wimg, pp, htaborg, htabmask);
378 typedef struct _htab_binary_sizes {
379 unsigned_word text_ra;
380 unsigned_word text_base;
381 unsigned_word text_bound;
382 unsigned_word data_ra;
383 unsigned_word data_base;
389 htab_sum_binary(bfd *abfd,
393 htab_binary_sizes *sizes = (htab_binary_sizes*)data;
394 unsigned_word size = bfd_get_section_size (sec);
395 unsigned_word vma = bfd_get_section_vma (abfd, sec);
396 unsigned_word ra = bfd_get_section_lma (abfd, sec);
398 /* skip the section if no memory to allocate */
399 if (! (bfd_get_section_flags(abfd, sec) & SEC_ALLOC))
402 if ((bfd_get_section_flags (abfd, sec) & SEC_CODE)
403 || (bfd_get_section_flags (abfd, sec) & SEC_READONLY)) {
404 if (sizes->text_bound < vma + size)
405 sizes->text_bound = ALIGN_PAGE(vma + size);
406 if (sizes->text_base > vma)
407 sizes->text_base = FLOOR_PAGE(vma);
408 if (sizes->text_ra > ra)
409 sizes->text_ra = FLOOR_PAGE(ra);
411 else if ((bfd_get_section_flags (abfd, sec) & SEC_DATA)
412 || (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)) {
413 if (sizes->data_bound < vma + size)
414 sizes->data_bound = ALIGN_PAGE(vma + size);
415 if (sizes->data_base > vma)
416 sizes->data_base = FLOOR_PAGE(vma);
417 if (sizes->data_ra > ra)
418 sizes->data_ra = FLOOR_PAGE(ra);
423 htab_dma_binary(bfd *abfd,
427 htab_binary_sizes *sizes = (htab_binary_sizes*)data;
429 unsigned_word section_vma;
430 unsigned_word section_size;
431 unsigned_word section_ra;
432 device *me = sizes->me;
434 /* skip the section if no memory to allocate */
435 if (! (bfd_get_section_flags(abfd, sec) & SEC_ALLOC))
438 /* check/ignore any sections of size zero */
439 section_size = bfd_get_section_size (sec);
440 if (section_size == 0)
443 /* if nothing to load, ignore this one */
444 if (! (bfd_get_section_flags(abfd, sec) & SEC_LOAD))
447 /* find where it is to go */
448 section_vma = bfd_get_section_vma(abfd, sec);
450 if ((bfd_get_section_flags (abfd, sec) & SEC_CODE)
451 || (bfd_get_section_flags (abfd, sec) & SEC_READONLY))
452 section_ra = (section_vma - sizes->text_base + sizes->text_ra);
453 else if ((bfd_get_section_flags (abfd, sec) & SEC_DATA))
454 section_ra = (section_vma - sizes->data_base + sizes->data_ra);
456 return; /* just ignore it */
459 ("load - name=%-7s vma=0x%.8lx size=%6ld ra=0x%.8lx flags=%3lx(%s%s%s%s%s )\n",
460 bfd_get_section_name(abfd, sec),
464 (long)bfd_get_section_flags(abfd, sec),
465 bfd_get_section_flags(abfd, sec) & SEC_LOAD ? " LOAD" : "",
466 bfd_get_section_flags(abfd, sec) & SEC_CODE ? " CODE" : "",
467 bfd_get_section_flags(abfd, sec) & SEC_DATA ? " DATA" : "",
468 bfd_get_section_flags(abfd, sec) & SEC_ALLOC ? " ALLOC" : "",
469 bfd_get_section_flags(abfd, sec) & SEC_READONLY ? " READONLY" : ""
472 /* dma in the sections data */
473 section_init = zalloc(section_size);
474 if (!bfd_get_section_contents(abfd,
478 bfd_perror("devices/pte");
479 device_error(me, "no data loaded");
481 if (device_dma_write_buffer(device_parent(me),
486 1 /*violate_read_only*/)
488 device_error(me, "broken dma transfer");
489 zfree(section_init); /* only free if load */
492 /* create a memory map from a binaries virtual addresses to a copy of
493 the binary laid out linearly in memory */
496 htab_map_binary(device *me,
497 device_instance *memory,
501 const char *file_name,
505 htab_binary_sizes sizes;
509 sizes.text_base = -1;
510 sizes.data_base = -1;
511 sizes.text_bound = 0;
512 sizes.data_bound = 0;
516 image = bfd_openr(file_name, NULL);
518 bfd_perror("devices/pte");
519 device_error(me, "the file %s not loaded", file_name);
522 /* check it is valid */
523 if (!bfd_check_format(image, bfd_object)) {
525 device_error(me, "the file %s has an invalid binary format", file_name);
528 /* determine the size of each of the files regions */
529 bfd_map_over_sections (image, htab_sum_binary, (PTR) &sizes);
531 /* if needed, determine the real addresses of the sections */
534 sizes.data_ra = ALIGN_PAGE(sizes.text_ra +
535 (sizes.text_bound - sizes.text_base));
538 DTRACE(htab, ("text map - base=0x%lx bound=0x%lx-1 ra=0x%lx\n",
539 (unsigned long)sizes.text_base,
540 (unsigned long)sizes.text_bound,
541 (unsigned long)sizes.text_ra));
542 DTRACE(htab, ("data map - base=0x%lx bound=0x%lx-1 ra=0x%lx\n",
543 (unsigned long)sizes.data_base,
544 (unsigned long)sizes.data_bound,
545 (unsigned long)sizes.data_ra));
547 /* check for and fix a botched image (text and data segments
549 if ((sizes.text_base <= sizes.data_base
550 && sizes.text_bound >= sizes.data_bound)
551 || (sizes.data_base <= sizes.text_base
552 && sizes.data_bound >= sizes.data_bound)
553 || (sizes.text_bound > sizes.data_base
554 && sizes.text_bound <= sizes.data_bound)
555 || (sizes.text_base >= sizes.data_base
556 && sizes.text_base < sizes.data_bound)) {
557 DTRACE(htab, ("text and data segment overlaped - using just data segment\n"));
558 /* check va->ra linear */
559 if ((sizes.text_base - sizes.text_ra)
560 != (sizes.data_base - sizes.data_ra))
561 device_error(me, "overlapping but missaligned text and data segments");
562 /* enlarge the data segment */
563 if (sizes.text_base < sizes.data_base)
564 sizes.data_base = sizes.text_base;
565 if (sizes.text_bound > sizes.data_bound)
566 sizes.data_bound = sizes.text_bound;
567 if (sizes.text_ra < sizes.data_ra)
568 sizes.data_ra = sizes.text_ra;
569 /* zap the text segment */
571 sizes.text_bound = 0;
573 DTRACE(htab, ("common map - base=0x%lx bound=0x%lx-1 ra=0x%lx\n",
574 (unsigned long)sizes.data_base,
575 (unsigned long)sizes.data_bound,
576 (unsigned long)sizes.data_ra));
579 /* set up virtual memory maps for each of the regions */
580 if (sizes.text_bound - sizes.text_base > 0) {
581 htab_map_region(me, memory, sizes.text_ra, sizes.text_base,
582 sizes.text_bound - sizes.text_base,
587 htab_map_region(me, memory, sizes.data_ra, sizes.data_base,
588 sizes.data_bound - sizes.data_base,
592 /* dma the sections into physical memory */
593 bfd_map_over_sections (image, htab_dma_binary, (PTR) &sizes);
597 htab_init_data_callback(device *me)
599 device_instance *memory = NULL;
600 if (WITH_TARGET_WORD_BITSIZE != 32)
601 device_error(me, "only 32bit targets currently suported");
603 /* find memory device */
604 if (device_find_property(me, "claim") != NULL)
605 memory = tree_find_ihandle_property(me, "/chosen/memory");
607 /* for the htab, just allocate space for it */
608 if (strcmp(device_name(me), "htab") == 0) {
609 unsigned_word address = device_find_integer_property(me, "real-address");
610 unsigned_word length = device_find_integer_property(me, "nr-bytes");
611 unsigned_word base = claim_memory(me, memory, address, length);
612 if (base == -1 || base != address)
613 device_error(me, "cannot allocate hash table");
616 /* for the pte, do all the real work */
617 if (strcmp(device_name(me), "pte") == 0) {
621 htab_decode_hash_table(me, &htaborg, &htabmask);
623 if (device_find_property(me, "file-name") != NULL) {
624 /* map in a binary */
625 unsigned pte_wimg = device_find_integer_property(me, "wimg");
626 unsigned pte_pp = device_find_integer_property(me, "pp");
627 const char *file_name = device_find_string_property(me, "file-name");
628 if (device_find_property(me, "real-address") != NULL) {
629 unsigned32 pte_ra = device_find_integer_property(me, "real-address");
630 DTRACE(htab, ("pte - ra=0x%lx, wimg=%ld, pp=%ld, file-name=%s\n",
631 (unsigned long)pte_ra,
632 (unsigned long)pte_wimg,
635 htab_map_binary(me, memory, pte_ra, pte_wimg, pte_pp, file_name,
639 DTRACE(htab, ("pte - wimg=%ld, pp=%ld, file-name=%s\n",
640 (unsigned long)pte_wimg,
643 htab_map_binary(me, memory, -1, pte_wimg, pte_pp, file_name,
648 /* handle a normal mapping definition */
649 unsigned64 pte_va = 0;
650 unsigned32 pte_ra = device_find_integer_property(me, "real-address");
651 unsigned pte_nr_bytes = device_find_integer_property(me, "nr-bytes");
652 unsigned pte_wimg = device_find_integer_property(me, "wimg");
653 unsigned pte_pp = device_find_integer_property(me, "pp");
654 signed_cell partial_va;
657 device_find_integer_array_property(me, "virtual-address", i, &partial_va);
659 pte_va = (pte_va << WITH_TARGET_WORD_BITSIZE) | (unsigned_cell)partial_va;
661 DTRACE(htab, ("pte - ra=0x%lx, wimg=%ld, pp=%ld, va=0x%lx, nr_bytes=%ld\n",
662 (unsigned long)pte_ra,
665 (unsigned long)pte_va,
666 (long)pte_nr_bytes));
667 htab_map_region(me, memory, pte_ra, pte_va, pte_nr_bytes, pte_wimg, pte_pp,
674 static device_callbacks const htab_callbacks = {
675 { NULL, htab_init_data_callback, },
676 { NULL, }, /* address */
678 { passthrough_device_dma_read_buffer,
679 passthrough_device_dma_write_buffer, },
680 { NULL, }, /* interrupt */
681 { generic_device_unit_decode,
682 generic_device_unit_encode, },
685 const device_descriptor hw_htab_device_descriptor[] = {
686 { "htab", NULL, &htab_callbacks },
687 { "pte", NULL, &htab_callbacks }, /* yep - uses htab's table */
691 #endif /* _HW_HTAB_C_ */