arch/parisc/kernel/pci-dma.c

   1 /*
   2 ** PARISC 1.1 Dynamic DMA mapping support.
   3 ** This implementation is for PA-RISC platforms that do not support
   4 ** I/O TLBs (aka DMA address translation hardware).
   5 ** See Documentation/DMA-mapping.txt for interface definitions.
   6 **
   7 **      (c) Copyright 1999,2000 Hewlett-Packard Company
   8 **      (c) Copyright 2000 Grant Grundler
   9 **      (c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
  10 **      (c) Copyright 2000 John Marvin
  11 **
  12 ** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
  13 ** (I assume it's from David Mosberger-Tang but there was no Copyright)
  14 **
  15 ** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
  16 **
  17 ** - ggg
  18 */
  19
  20 #include <linux/init.h>
  21 #include <linux/mm.h>
  22 #include <linux/pci.h>
  23 #include <linux/proc_fs.h>
  24 #include <linux/slab.h>
  25 #include <linux/string.h>
  26 #include <linux/types.h>
  27
  28 #include <asm/cacheflush.h>
  29 #include <asm/dma.h>    /* for DMA_CHUNK_SIZE */
  30 #include <asm/io.h>
  31 #include <asm/page.h>   /* get_order */
  32 #include <asm/pgalloc.h>
  33 #include <asm/uaccess.h>
  34
  35 #ifdef DEBUG_PCI
  36 #undef ASSERT
  37 #define ASSERT(expr) \
  38         if(!(expr)) { \
  39                 printk("\n%s:%d: Assertion " #expr " failed!\n", \
  40                                 __FILE__, __LINE__); \
  41                 panic(#expr); \
  42         }
  43 #else
  44 #define ASSERT(expr)
  45 #endif
  46
  47
  48 static struct proc_dir_entry * proc_gsc_root = NULL;
  49 static int pcxl_proc_info(char *buffer, char **start, off_t offset, int length);
  50 static unsigned long pcxl_used_bytes = 0;
  51 static unsigned long pcxl_used_pages = 0;
  52
  53 extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
  54 static spinlock_t   pcxl_res_lock;
  55 static char    *pcxl_res_map;
  56 static int     pcxl_res_hint;
  57 static int     pcxl_res_size;
  58
  59 #ifdef DEBUG_PCXL_RESOURCE
  60 #define DBG_RES(x...)   printk(x)
  61 #else
  62 #define DBG_RES(x...)
  63 #endif
  64
  65
  66 /*
  67 ** Dump a hex representation of the resource map.
  68 */
  69
  70 #ifdef DUMP_RESMAP
  71 static
  72 void dump_resmap(void)
  73 {
  74         u_long *res_ptr = (unsigned long *)pcxl_res_map;
  75         u_long i = 0;
  76
  77         printk("res_map: ");
  78         for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
  79                 printk("%08lx ", *res_ptr);
  80
  81         printk("\n");
  82 }
  83 #else
  84 static inline void dump_resmap(void) {;}
  85 #endif
  86
  87 static int pa11_dma_supported( struct device *dev, u64 mask)
  88 {
  89         return 1;
  90 }
  91
  92 static inline int map_pte_uncached(pte_t * pte,
  93                 unsigned long vaddr,
  94                 unsigned long size, unsigned long *paddr_ptr)
  95 {
  96         unsigned long end;
  97         unsigned long orig_vaddr = vaddr;
  98
  99         vaddr &= ~PMD_MASK;
 100         end = vaddr + size;
 101         if (end > PMD_SIZE)
 102                 end = PMD_SIZE;
 103         do {
 104                 if (!pte_none(*pte))
 105                         printk(KERN_ERR "map_pte_uncached: page already exists\n");
 106                 set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
 107                 pdtlb_kernel(orig_vaddr);
 108                 vaddr += PAGE_SIZE;
 109                 orig_vaddr += PAGE_SIZE;
 110                 (*paddr_ptr) += PAGE_SIZE;
 111                 pte++;
 112         } while (vaddr < end);
 113         return 0;
 114 }
 115
 116 static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
 117                 unsigned long size, unsigned long *paddr_ptr)
 118 {
 119         unsigned long end;
 120         unsigned long orig_vaddr = vaddr;
 121
 122         vaddr &= ~PGDIR_MASK;
 123         end = vaddr + size;
 124         if (end > PGDIR_SIZE)
 125                 end = PGDIR_SIZE;
 126         do {
 127                 pte_t * pte = pte_alloc_kernel(&init_mm, pmd, vaddr);
 128                 if (!pte)
 129                         return -ENOMEM;
 130                 if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
 131                         return -ENOMEM;
 132                 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
 133                 orig_vaddr += PMD_SIZE;
 134                 pmd++;
 135         } while (vaddr < end);
 136         return 0;
 137 }
 138
 139 static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
 140                 unsigned long paddr)
 141 {
 142         pgd_t * dir;
 143         unsigned long end = vaddr + size;
 144
 145         dir = pgd_offset_k(vaddr);
 146         do {
 147                 pmd_t *pmd;
 148
 149                 pmd = pmd_alloc(NULL, dir, vaddr);
 150                 if (!pmd)
 151                         return -ENOMEM;
 152                 if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
 153                         return -ENOMEM;
 154                 vaddr = vaddr + PGDIR_SIZE;
 155                 dir++;
 156         } while (vaddr && (vaddr < end));
 157         return 0;
 158 }
 159
 160 static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
 161                 unsigned long size)
 162 {
 163         pte_t * pte;
 164         unsigned long end;
 165         unsigned long orig_vaddr = vaddr;
 166
 167         if (pmd_none(*pmd))
 168                 return;
 169         if (pmd_bad(*pmd)) {
 170                 pmd_ERROR(*pmd);
 171                 pmd_clear(pmd);
 172                 return;
 173         }
 174         pte = pte_offset_map(pmd, vaddr);
 175         vaddr &= ~PMD_MASK;
 176         end = vaddr + size;
 177         if (end > PMD_SIZE)
 178                 end = PMD_SIZE;
 179         do {
 180                 pte_t page = *pte;
 181                 pte_clear(pte);
 182                 pdtlb_kernel(orig_vaddr);
 183                 vaddr += PAGE_SIZE;
 184                 orig_vaddr += PAGE_SIZE;
 185                 pte++;
 186                 if (pte_none(page) || pte_present(page))
 187                         continue;
 188                 printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
 189         } while (vaddr < end);
 190 }
 191
 192 static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
 193                 unsigned long size)
 194 {
 195         pmd_t * pmd;
 196         unsigned long end;
 197         unsigned long orig_vaddr = vaddr;
 198
 199         if (pgd_none(*dir))
 200                 return;
 201         if (pgd_bad(*dir)) {
 202                 pgd_ERROR(*dir);
 203                 pgd_clear(dir);
 204                 return;
 205         }
 206         pmd = pmd_offset(dir, vaddr);
 207         vaddr &= ~PGDIR_MASK;
 208         end = vaddr + size;
 209         if (end > PGDIR_SIZE)
 210                 end = PGDIR_SIZE;
 211         do {
 212                 unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
 213                 vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
 214                 orig_vaddr += PMD_SIZE;
 215                 pmd++;
 216         } while (vaddr < end);
 217 }
 218
 219 static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
 220 {
 221         pgd_t * dir;
 222         unsigned long end = vaddr + size;
 223
 224         dir = pgd_offset_k(vaddr);
 225         do {
 226                 unmap_uncached_pmd(dir, vaddr, end - vaddr);
 227                 vaddr = vaddr + PGDIR_SIZE;
 228                 dir++;
 229         } while (vaddr && (vaddr < end));
 230 }
 231
 232 #define PCXL_SEARCH_LOOP(idx, mask, size)  \
 233        for(; res_ptr < res_end; ++res_ptr) \
 234        { \
 235                if(0 == ((*res_ptr) & mask)) { \
 236                        *res_ptr |= mask; \
 237                        idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
 238                        pcxl_res_hint = idx + (size >> 3); \
 239                        goto resource_found; \
 240                } \
 241        }
 242
 243 #define PCXL_FIND_FREE_MAPPING(idx, mask, size)  { \
 244        u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
 245        u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
 246        PCXL_SEARCH_LOOP(idx, mask, size); \
 247        res_ptr = (u##size *)&pcxl_res_map[0]; \
 248        PCXL_SEARCH_LOOP(idx, mask, size); \
 249 }
 250
 251 unsigned long
 252 pcxl_alloc_range(size_t size)
 253 {
 254         int res_idx;
 255         u_long mask, flags;
 256         unsigned int pages_needed = size >> PAGE_SHIFT;
 257
 258         ASSERT(pages_needed);
 259         ASSERT((pages_needed * PAGE_SIZE) < DMA_CHUNK_SIZE);
 260         ASSERT(pages_needed < (BITS_PER_LONG - PAGE_SHIFT));
 261
 262         mask = (u_long) -1L;
 263         mask >>= BITS_PER_LONG - pages_needed;
 264
 265         DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n",
 266                 size, pages_needed, mask);
 267
 268         spin_lock_irqsave(&pcxl_res_lock, flags);
 269
 270         if(pages_needed <= 8) {
 271                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
 272         } else if(pages_needed <= 16) {
 273                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
 274         } else if(pages_needed <= 32) {
 275                 PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
 276         } else {
 277                 panic("%s: pcxl_alloc_range() Too many pages to map.\n",
 278                       __FILE__);
 279         }
 280
 281         dump_resmap();
 282         panic("%s: pcxl_alloc_range() out of dma mapping resources\n",
 283               __FILE__);
 284
 285 resource_found:
 286
 287         DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
 288                 res_idx, mask, pcxl_res_hint);
 289
 290         pcxl_used_pages += pages_needed;
 291         pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
 292
 293         spin_unlock_irqrestore(&pcxl_res_lock, flags);
 294
 295         dump_resmap();
 296
 297         /*
 298         ** return the corresponding vaddr in the pcxl dma map
 299         */
 300         return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
 301 }
 302
 303 #define PCXL_FREE_MAPPINGS(idx, m, size) \
 304                 u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
 305                 ASSERT((*res_ptr & m) == m); \
 306                 *res_ptr &= ~m;
 307
 308 /*
 309 ** clear bits in the pcxl resource map
 310 */
 311 static void
 312 pcxl_free_range(unsigned long vaddr, size_t size)
 313 {
 314         u_long mask, flags;
 315         unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
 316         unsigned int pages_mapped = size >> PAGE_SHIFT;
 317
 318         ASSERT(pages_mapped);
 319         ASSERT((pages_mapped * PAGE_SIZE) < DMA_CHUNK_SIZE);
 320         ASSERT(pages_mapped < (BITS_PER_LONG - PAGE_SHIFT));
 321
 322         mask = (u_long) -1L;
 323         mask >>= BITS_PER_LONG - pages_mapped;
 324
 325         DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n",
 326                 res_idx, size, pages_mapped, mask);
 327
 328         spin_lock_irqsave(&pcxl_res_lock, flags);
 329
 330         if(pages_mapped <= 8) {
 331                 PCXL_FREE_MAPPINGS(res_idx, mask, 8);
 332         } else if(pages_mapped <= 16) {
 333                 PCXL_FREE_MAPPINGS(res_idx, mask, 16);
 334         } else if(pages_mapped <= 32) {
 335                 PCXL_FREE_MAPPINGS(res_idx, mask, 32);
 336         } else {
 337                 panic("%s: pcxl_free_range() Too many pages to unmap.\n",
 338                       __FILE__);
 339         }
 340
 341         pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
 342         pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
 343
 344         spin_unlock_irqrestore(&pcxl_res_lock, flags);
 345
 346         dump_resmap();
 347 }
 348
 349 static int __init
 350 pcxl_dma_init(void)
 351 {
 352     if (pcxl_dma_start == 0)
 353         return 0;
 354
 355     spin_lock_init(&pcxl_res_lock);
 356     pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
 357     pcxl_res_hint = 0;
 358     pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
 359                                             get_order(pcxl_res_size));
 360     memset(pcxl_res_map, 0, pcxl_res_size);
 361     proc_gsc_root = proc_mkdir("gsc", 0);
 362     create_proc_info_entry("dino", 0, proc_gsc_root, pcxl_proc_info);
 363     return 0;
 364 }
 365
 366 __initcall(pcxl_dma_init);
 367
 368 static void * pa11_dma_alloc_consistent (struct device *dev, size_t size, dma_addr_t *dma_handle, int flag)
 369 {
 370         unsigned long vaddr;
 371         unsigned long paddr;
 372         int order;
 373
 374         order = get_order(size);
 375         size = 1 << (order + PAGE_SHIFT);
 376         vaddr = pcxl_alloc_range(size);
 377         paddr = __get_free_pages(flag, order);
 378         flush_kernel_dcache_range(paddr, size);
 379         paddr = __pa(paddr);
 380         map_uncached_pages(vaddr, size, paddr);
 381         *dma_handle = (dma_addr_t) paddr;
 382
 383 #if 0
 384 /* This probably isn't needed to support EISA cards.
 385 ** ISA cards will certainly only support 24-bit DMA addressing.
 386 ** Not clear if we can, want, or need to support ISA.
 387 */
 388         if (!dev || *dev->coherent_dma_mask < 0xffffffff)
 389                 gfp |= GFP_DMA;
 390 #endif
 391         return (void *)vaddr;
 392 }
 393
 394 static void pa11_dma_free_consistent (struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle)
 395 {
 396         int order;
 397
 398         order = get_order(size);
 399         size = 1 << (order + PAGE_SHIFT);
 400         unmap_uncached_pages((unsigned long)vaddr, size);
 401         pcxl_free_range((unsigned long)vaddr, size);
 402         free_pages((unsigned long)__va(dma_handle), order);
 403 }
 404
 405 static dma_addr_t pa11_dma_map_single(struct device *dev, void *addr, size_t size, enum dma_data_direction direction)
 406 {
 407         if (direction == DMA_NONE) {
 408                 printk(KERN_ERR "pa11_dma_map_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0));
 409                 BUG();
 410         }
 411
 412         flush_kernel_dcache_range((unsigned long) addr, size);
 413         return virt_to_phys(addr);
 414 }
 415
 416 static void pa11_dma_unmap_single(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
 417 {
 418         if (direction == DMA_NONE) {
 419                 printk(KERN_ERR "pa11_dma_unmap_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0));
 420                 BUG();
 421         }
 422
 423         if (direction == DMA_TO_DEVICE)
 424             return;
 425
 426         /*
 427          * For PCI_DMA_FROMDEVICE this flush is not necessary for the
 428          * simple map/unmap case. However, it IS necessary if if
 429          * pci_dma_sync_single_* has been called and the buffer reused.
 430          */
 431
 432         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
 433         return;
 434 }
 435
 436 static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 437 {
 438         int i;
 439
 440         if (direction == DMA_NONE)
 441             BUG();
 442
 443         for (i = 0; i < nents; i++, sglist++ ) {
 444                 unsigned long vaddr = sg_virt_addr(sglist);
 445                 sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(vaddr);
 446                 sg_dma_len(sglist) = sglist->length;
 447                 flush_kernel_dcache_range(vaddr, sglist->length);
 448         }
 449         return nents;
 450 }
 451
 452 static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 453 {
 454         int i;
 455
 456         if (direction == DMA_NONE)
 457             BUG();
 458
 459         if (direction == DMA_TO_DEVICE)
 460             return;
 461
 462         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 463
 464         for (i = 0; i < nents; i++, sglist++ )
 465                 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
 466         return;
 467 }
 468
 469 static void pa11_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction)
 470 {
 471         if (direction == DMA_NONE)
 472             BUG();
 473
 474         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
 475 }
 476
 477 static void pa11_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction)
 478 {
 479         if (direction == DMA_NONE)
 480             BUG();
 481
 482         flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle) + offset, size);
 483 }
 484
 485 static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 486 {
 487         int i;
 488
 489         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 490
 491         for (i = 0; i < nents; i++, sglist++ )
 492                 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
 493 }
 494
 495 static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
 496 {
 497         int i;
 498
 499         /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
 500
 501         for (i = 0; i < nents; i++, sglist++ )
 502                 flush_kernel_dcache_range(sg_virt_addr(sglist), sglist->length);
 503 }
 504
 505 struct hppa_dma_ops pcxl_dma_ops = {
 506         .dma_supported =        pa11_dma_supported,
 507         .alloc_consistent =     pa11_dma_alloc_consistent,
 508         .alloc_noncoherent =    pa11_dma_alloc_consistent,
 509         .free_consistent =      pa11_dma_free_consistent,
 510         .map_single =           pa11_dma_map_single,
 511         .unmap_single =         pa11_dma_unmap_single,
 512         .map_sg =               pa11_dma_map_sg,
 513         .unmap_sg =             pa11_dma_unmap_sg,
 514         .dma_sync_single_for_cpu = pa11_dma_sync_single_for_cpu,
 515         .dma_sync_single_for_device = pa11_dma_sync_single_for_device,
 516         .dma_sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu,
 517         .dma_sync_sg_for_device = pa11_dma_sync_sg_for_device,
 518 };
 519
 520 static void *fail_alloc_consistent(struct device *dev, size_t size,
 521                                    dma_addr_t *dma_handle, int flag)
 522 {
 523         return NULL;
 524 }
 525
 526 static void *pa11_dma_alloc_noncoherent(struct device *dev, size_t size,
 527                                           dma_addr_t *dma_handle, int flag)
 528 {
 529         void *addr = NULL;
 530
 531         /* rely on kmalloc to be cacheline aligned */
 532         addr = kmalloc(size, flag);
 533         if(addr)
 534                 *dma_handle = (dma_addr_t)virt_to_phys(addr);
 535
 536         return addr;
 537 }
 538
 539 static void pa11_dma_free_noncoherent(struct device *dev, size_t size,
 540                                         void *vaddr, dma_addr_t iova)
 541 {
 542         kfree(vaddr);
 543         return;
 544 }
 545
 546 struct hppa_dma_ops pcx_dma_ops = {
 547         .dma_supported =        pa11_dma_supported,
 548         .alloc_consistent =     fail_alloc_consistent,
 549         .alloc_noncoherent =    pa11_dma_alloc_noncoherent,
 550         .free_consistent =      pa11_dma_free_noncoherent,
 551         .map_single =           pa11_dma_map_single,
 552         .unmap_single =         pa11_dma_unmap_single,
 553         .map_sg =               pa11_dma_map_sg,
 554         .unmap_sg =             pa11_dma_unmap_sg,
 555         .dma_sync_single_for_cpu =      pa11_dma_sync_single_for_cpu,
 556         .dma_sync_single_for_device =   pa11_dma_sync_single_for_device,
 557         .dma_sync_sg_for_cpu =          pa11_dma_sync_sg_for_cpu,
 558         .dma_sync_sg_for_device =       pa11_dma_sync_sg_for_device,
 559 };
 560
 561
 562 static int pcxl_proc_info(char *buf, char **start, off_t offset, int len)
 563 {
 564         u_long i = 0;
 565         unsigned long *res_ptr = (u_long *)pcxl_res_map;
 566         unsigned long total_pages = pcxl_res_size << 3;        /* 8 bits per byte */
 567
 568         sprintf(buf, "\nDMA Mapping Area size    : %d bytes (%d pages)\n",
 569                 PCXL_DMA_MAP_SIZE,
 570                 (pcxl_res_size << 3) ); /* 1 bit per page */
 571
 572         sprintf(buf, "%sResource bitmap : %d bytes (%d pages)\n",
 573                 buf, pcxl_res_size, pcxl_res_size << 3);   /* 8 bits per byte */
 574
 575         strcat(buf,  "            total:    free:    used:   % used:\n");
 576         sprintf(buf, "%sblocks  %8d %8ld %8ld %8ld%%\n", buf, pcxl_res_size,
 577                 pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
 578                 (pcxl_used_bytes * 100) / pcxl_res_size);
 579
 580         sprintf(buf, "%spages   %8ld %8ld %8ld %8ld%%\n", buf, total_pages,
 581                 total_pages - pcxl_used_pages, pcxl_used_pages,
 582                 (pcxl_used_pages * 100 / total_pages));
 583
 584         strcat(buf, "\nResource bitmap:");
 585
 586         for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
 587                 if ((i & 7) == 0)
 588                     strcat(buf,"\n   ");
 589                 sprintf(buf, "%s %08lx", buf, *res_ptr);
 590         }
 591         strcat(buf, "\n");
 592         return strlen(buf);
 593 }
 594