1 /*
2 * PowerPC version
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
6 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
7 * Copyright (C) 1996 Paul Mackerras
8 * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
9 *
10 * Derived from "arch/i386/mm/init.c"
11 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
12 *
13 * Dave Engebretsen <engebret@us.ibm.com>
14 * Rework for PPC64 port.
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
20 *
21 */
22
23 #include <linux/config.h>
24 #include <linux/signal.h>
25 #include <linux/sched.h>
26 #include <linux/kernel.h>
27 #include <linux/errno.h>
28 #include <linux/string.h>
29 #include <linux/types.h>
30 #include <linux/ptrace.h>
31 #include <linux/mman.h>
32 #include <linux/mm.h>
33 #include <linux/slab.h>
34 #include <linux/swap.h>
35 #include <linux/stddef.h>
36 #include <linux/vmalloc.h>
37 #include <linux/init.h>
38 #include <linux/delay.h>
39 #include <linux/bootmem.h>
40 #include <linux/highmem.h>
41 #ifdef CONFIG_BLK_DEV_INITRD
42 #include <linux/blk.h> /* for initrd_* */
43 #endif
44
45 #include <asm/pgalloc.h>
46 #include <asm/page.h>
47 #include <asm/abs_addr.h>
48 #include <asm/prom.h>
49 #include <asm/lmb.h>
50 #include <asm/rtas.h>
51 #include <asm/io.h>
52 #include <asm/mmu_context.h>
53 #include <asm/pgtable.h>
54 #include <asm/mmu.h>
55 #include <asm/uaccess.h>
56 #include <asm/smp.h>
57 #include <asm/machdep.h>
58 #include <asm/tlb.h>
59 #include <asm/naca.h>
60 #include <asm/eeh.h>
61
62 #include <asm/ppcdebug.h>
63
64 #define PGTOKB(pages) (((pages) * PAGE_SIZE) >> 10)
65
66 #ifdef CONFIG_PPC_ISERIES
67 #include <asm/iSeries/iSeries_dma.h>
68 #endif
69
70 struct mmu_context_queue_t mmu_context_queue;
71 int mem_init_done;
72 unsigned long ioremap_bot = IMALLOC_BASE;
73
74 static int boot_mapsize;
75 static unsigned long totalram_pages;
76
77 extern pgd_t swapper_pg_dir[];
78 extern char __init_begin, __init_end;
79 extern char __chrp_begin, __chrp_end;
80 extern char __openfirmware_begin, __openfirmware_end;
81 extern struct _of_tce_table of_tce_table[];
82 extern char _start[], _end[];
83 extern char _stext[], etext[];
84 extern struct task_struct *current_set[NR_CPUS];
85
86 extern pgd_t ioremap_dir[];
87 pgd_t * ioremap_pgd = (pgd_t *)&ioremap_dir;
88
89 static void map_io_page(unsigned long va, unsigned long pa, int flags);
90 extern void die_if_kernel(char *,struct pt_regs *,long);
91
92 unsigned long klimit = (unsigned long)_end;
93
94 HPTE *Hash=0;
95 unsigned long Hash_size=0;
96 unsigned long _SDR1=0;
97 unsigned long _ASR=0;
98
99 /* max amount of RAM to use */
100 unsigned long __max_memory;
101
102 /* This is declared as we are using the more or less generic
103 * include/asm-ppc64/tlb.h file -- tgall
104 */
105 mmu_gather_t mmu_gathers[NR_CPUS];
106
107 int do_check_pgt_cache(int low, int high)
108 {
109 int freed = 0;
110
111 if (pgtable_cache_size > high) {
112 do {
113 if (pgd_quicklist)
114 free_page((unsigned long)pgd_alloc_one_fast(0)), ++freed;
115 if (pmd_quicklist)
116 free_page((unsigned long)pmd_alloc_one_fast(0, 0)), ++freed;
117 if (pte_quicklist)
118 free_page((unsigned long)pte_alloc_one_fast(0, 0)), ++freed;
119 } while (pgtable_cache_size > low);
120 }
121 return freed;
122 }
123
124 void show_mem(void)
125 {
126 int i,free = 0,total = 0,reserved = 0;
127 int shared = 0, cached = 0;
128
129 printk("Mem-info:\n");
130 show_free_areas();
131 printk("Free swap: %6dkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
132 i = max_mapnr;
133 while (i-- > 0) {
134 total++;
135 if (PageReserved(mem_map+i))
136 reserved++;
137 else if (PageSwapCache(mem_map+i))
138 cached++;
139 else if (!atomic_read(&mem_map[i].count))
140 free++;
141 else
142 shared += atomic_read(&mem_map[i].count) - 1;
143 }
144 printk("%d pages of RAM\n",total);
145 printk("%d free pages\n",free);
146 printk("%d reserved pages\n",reserved);
147 printk("%d pages shared\n",shared);
148 printk("%d pages swap cached\n",cached);
149 printk("%d pages in page table cache\n",(int)pgtable_cache_size);
150 show_buffers();
151 }
152
153 void si_meminfo(struct sysinfo *val)
154 {
155 val->totalram = totalram_pages;
156 val->sharedram = 0;
157 val->freeram = nr_free_pages();
158 val->bufferram = atomic_read(&buffermem_pages);
159 val->totalhigh = 0;
160 val->freehigh = 0;
161 val->mem_unit = PAGE_SIZE;
162 }
163
164 void *
165 ioremap(unsigned long addr, unsigned long size)
166 {
167 #ifdef CONFIG_PPC_ISERIES
168 return (void*)addr;
169 #else
170 void *ret = __ioremap(addr, size, _PAGE_NO_CACHE);
171 if(mem_init_done)
172 return eeh_ioremap(addr, ret); /* may remap the addr */
173 return ret;
174 #endif
175 }
176
177 extern struct vm_struct * get_im_area( unsigned long size );
178
179 void *
180 __ioremap(unsigned long addr, unsigned long size, unsigned long flags)
181 {
182 unsigned long pa, ea, i;
183
184 /*
185 * Choose an address to map it to.
186 * Once the imalloc system is running, we use it.
187 * Before that, we map using addresses going
188 * up from ioremap_bot. imalloc will use
189 * the addresses from ioremap_bot through
190 * IMALLOC_END (0xE000001fffffffff)
191 *
192 */
193 pa = addr & PAGE_MASK;
194 size = PAGE_ALIGN(addr + size) - pa;
195
196 if (size == 0)
197 return NULL;
198
199 if (mem_init_done) {
200 struct vm_struct *area;
201 area = get_im_area(size);
202 if (area == 0)
203 return NULL;
204 ea = (unsigned long)(area->addr);
205 }
206 else {
207 ea = ioremap_bot;
208 ioremap_bot += size;
209 }
210
211 if ((flags & _PAGE_PRESENT) == 0)
212 flags |= pgprot_val(PAGE_KERNEL);
213 if (flags & (_PAGE_NO_CACHE | _PAGE_WRITETHRU))
214 flags |= _PAGE_GUARDED;
215
216 for (i = 0; i < size; i += PAGE_SIZE) {
217 map_io_page(ea+i, pa+i, flags);
218 }
219
220 return (void *) (ea + (addr & ~PAGE_MASK));
221 }
222
223 void iounmap(void *addr)
224 {
225 #ifdef CONFIG_PPC_ISERIES
226 /* iSeries I/O Remap is a noop */
227 return;
228 #else
229 /* DRENG / PPPBBB todo */
230 return;
231 #endif
232 }
233
234 /*
235 * map_io_page currently only called by __ioremap
236 * map_io_page adds an entry to the ioremap page table
237 * and adds an entry to the HPT, possibly bolting it
238 */
239 static void map_io_page(unsigned long ea, unsigned long pa, int flags)
240 {
241 pgd_t *pgdp;
242 pmd_t *pmdp;
243 pte_t *ptep;
244 unsigned long vsid;
245
246 if (mem_init_done) {
247 spin_lock(&ioremap_mm.page_table_lock);
248 pgdp = pgd_offset_i(ea);
249 pmdp = pmd_alloc(&ioremap_mm, pgdp, ea);
250 ptep = pte_alloc(&ioremap_mm, pmdp, ea);
251
252 pa = absolute_to_phys(pa);
253 set_pte(ptep, mk_pte_phys(pa & PAGE_MASK, __pgprot(flags)));
254 spin_unlock(&ioremap_mm.page_table_lock);
255 } else {
256 /* If the mm subsystem is not fully up, we cannot create a
257 * linux page table entry for this mapping. Simply bolt an
258 * entry in the hardware page table.
259 */
260 vsid = get_kernel_vsid(ea);
261 make_pte(htab_data.htab,
262 (vsid << 28) | (ea & 0xFFFFFFF), // va (NOT the ea)
263 pa,
264 _PAGE_NO_CACHE | _PAGE_GUARDED | PP_RWXX,
265 htab_data.htab_hash_mask, 0);
266 }
267 }
268
269 #ifndef CONFIG_PPC_ISERIES
270 int
271 io_remap_page_range(unsigned long from, unsigned long to, unsigned long size, pgprot_t prot)
272 {
273 return remap_page_range(from, eeh_token_to_phys(to), size, prot);
274 }
275 #endif
276
277 void
278 local_flush_tlb_all(void)
279 {
280 /* Implemented to just flush the vmalloc area.
281 * vmalloc is the only user of flush_tlb_all.
282 */
283 #ifdef CONFIG_SHARED_MEMORY_ADDRESSING
284 local_flush_tlb_range( NULL, VMALLOC_START, SMALLOC_END );
285 #else
286 local_flush_tlb_range( NULL, VMALLOC_START, VMALLOC_END );
287 #endif
288 }
289
290 void
291 local_flush_tlb_mm(struct mm_struct *mm)
292 {
293 spin_lock(&mm->page_table_lock);
294
295 if ( mm->map_count ) {
296 struct vm_area_struct *mp;
297 for ( mp = mm->mmap; mp != NULL; mp = mp->vm_next )
298 local_flush_tlb_range( mm, mp->vm_start, mp->vm_end );
299 }
300
301 spin_unlock(&mm->page_table_lock);
302 }
303
304 /*
305 * Callers should hold the mm->page_table_lock
306 */
307 void
308 local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
309 {
310 unsigned long context = 0;
311 pgd_t *pgd;
312 pmd_t *pmd;
313 pte_t *ptep;
314
315 switch( REGION_ID(vmaddr) ) {
316 case VMALLOC_REGION_ID:
317 pgd = pgd_offset_k( vmaddr );
318 break;
319 case IO_REGION_ID:
320 pgd = pgd_offset_i( vmaddr );
321 break;
322 case USER_REGION_ID:
323 pgd = pgd_offset( vma->vm_mm, vmaddr );
324 context = vma->vm_mm->context;
325 break;
326 default:
327 panic("local_flush_tlb_page: invalid region 0x%016lx", vmaddr);
328
329 }
330
331 if (!pgd_none(*pgd)) {
332 pmd = pmd_offset(pgd, vmaddr);
333 if (!pmd_none(*pmd)) {
334 ptep = pte_offset(pmd, vmaddr);
335 /* Check if HPTE might exist and flush it if so */
336 if (pte_val(*ptep) & _PAGE_HASHPTE)
337 flush_hash_page(context, vmaddr, ptep);
338 }
339 }
340 }
341
342 void
343 local_flush_tlb_range(struct mm_struct *mm, unsigned long start, unsigned long end)
344 {
345 pgd_t *pgd;
346 pmd_t *pmd;
347 pte_t *ptep;
348 unsigned long pgd_end, pmd_end;
349 unsigned long context;
350
351 if ( start >= end )
352 panic("flush_tlb_range: start (%016lx) greater than end (%016lx)\n", start, end );
353
354 if ( REGION_ID(start) != REGION_ID(end) )
355 panic("flush_tlb_range: start (%016lx) and end (%016lx) not in same region\n", start, end );
356
357 context = 0;
358
359 switch( REGION_ID(start) ) {
360 case VMALLOC_REGION_ID:
361 pgd = pgd_offset_k( start );
362 break;
363 case IO_REGION_ID:
364 pgd = pgd_offset_i( start );
365 break;
366 case USER_REGION_ID:
367 pgd = pgd_offset( mm, start );
368 context = mm->context;
369 break;
370 default:
371 panic("flush_tlb_range: invalid region for start (%016lx) and end (%016lx)\n", start, end);
372
373 }
374
375 do {
376 pgd_end = (start + PGDIR_SIZE) & PGDIR_MASK;
377 if ( pgd_end > end )
378 pgd_end = end;
379 if ( !pgd_none( *pgd ) ) {
380 pmd = pmd_offset( pgd, start );
381 do {
382 pmd_end = ( start + PMD_SIZE ) & PMD_MASK;
383 if ( pmd_end > end )
384 pmd_end = end;
385 if ( !pmd_none( *pmd ) ) {
386 ptep = pte_offset( pmd, start );
387 do {
388 if ( pte_val(*ptep) & _PAGE_HASHPTE )
389 flush_hash_page( context, start, ptep );
390 start += PAGE_SIZE;
391 ++ptep;
392 } while ( start < pmd_end );
393 }
394 else
395 start = pmd_end;
396 ++pmd;
397 } while ( start < pgd_end );
398 }
399 else
400 start = pgd_end;
401 ++pgd;
402 } while ( start < end );
403 }
404
405
406 void __init free_initmem(void)
407 {
408 unsigned long a;
409 unsigned long num_freed_pages = 0;
410 #define FREESEC(START,END,CNT) do { \
411 a = (unsigned long)(&START); \
412 for (; a < (unsigned long)(&END); a += PAGE_SIZE) { \
413 clear_bit(PG_reserved, &mem_map[MAP_NR(a)].flags); \
414 set_page_count(mem_map+MAP_NR(a), 1); \
415 free_page(a); \
416 CNT++; \
417 } \
418 } while (0)
419
420 FREESEC(__init_begin,__init_end,num_freed_pages);
421
422 printk ("Freeing unused kernel memory: %ldk init\n",
423 PGTOKB(num_freed_pages));
424 }
425
426 #ifdef CONFIG_BLK_DEV_INITRD
427 void free_initrd_mem(unsigned long start, unsigned long end)
428 {
429 unsigned long xstart = start;
430 for (; start < end; start += PAGE_SIZE) {
431 ClearPageReserved(mem_map + MAP_NR(start));
432 set_page_count(mem_map+MAP_NR(start), 1);
433 free_page(start);
434 totalram_pages++;
435 }
436 printk ("Freeing initrd memory: %ldk freed\n", (end - xstart) >> 10);
437 }
438 #endif
439
440 /*
441 * Do very early mm setup.
442 */
443 void __init mm_init_ppc64(void)
444 {
445 struct paca_struct *lpaca;
446 unsigned long guard_page, index;
447
448 ppc_md.progress("MM:init", 0);
449
450 /* Reserve all contexts < FIRST_USER_CONTEXT for kernel use.
451 * The range of contexts [FIRST_USER_CONTEXT, NUM_USER_CONTEXT)
452 * are stored on a stack/queue for easy allocation and deallocation.
453 */
454 mmu_context_queue.lock = SPIN_LOCK_UNLOCKED;
455 mmu_context_queue.head = 0;
456 mmu_context_queue.tail = NUM_USER_CONTEXT-1;
457 mmu_context_queue.size = NUM_USER_CONTEXT;
458 for(index=0; index < NUM_USER_CONTEXT ;index++) {
459 mmu_context_queue.elements[index] = index+FIRST_USER_CONTEXT;
460 }
461
462 /* Setup guard pages for the Paca's */
463 for (index = 0; index < NR_CPUS; index++) {
464 lpaca = &paca[index];
465 guard_page = ((unsigned long)lpaca) + 0x1000;
466 ppc_md.hpte_updateboltedpp(PP_RXRX, guard_page);
467 }
468
469 ppc_md.progress("MM:exit", 0x211);
470 }
471
472 /*
473 * Initialize the bootmem system and give it all the memory we
474 * have available.
475 */
476 void __init do_init_bootmem(void)
477 {
478 unsigned long i;
479 unsigned long start, bootmap_pages;
480 unsigned long total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT;
481
482 PPCDBG(PPCDBG_MMINIT, "do_init_bootmem: start\n");
483 /*
484 * Find an area to use for the bootmem bitmap. Calculate the size of
485 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
486 * Add 1 additional page in case the address isn't page-aligned.
487 */
488 bootmap_pages = bootmem_bootmap_pages(total_pages);
489
490 start = (unsigned long)__a2p(lmb_alloc(bootmap_pages<<PAGE_SHIFT, PAGE_SIZE));
491 if (start == 0) {
492 udbg_printf("do_init_bootmem: failed to allocate a bitmap.\n");
493 udbg_printf("\tbootmap_pages = 0x%lx.\n", bootmap_pages);
494 PPCDBG_ENTER_DEBUGGER();
495 }
496
497 PPCDBG(PPCDBG_MMINIT, "\tstart = 0x%lx\n", start);
498 PPCDBG(PPCDBG_MMINIT, "\tbootmap_pages = 0x%lx\n", bootmap_pages);
499 PPCDBG(PPCDBG_MMINIT, "\tphysicalMemorySize = 0x%lx\n", systemcfg->physicalMemorySize);
500
501 boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages);
502 PPCDBG(PPCDBG_MMINIT, "\tboot_mapsize = 0x%lx\n", boot_mapsize);
503
504 /* add all physical memory to the bootmem map */
505 for (i=0; i < lmb.memory.cnt; i++) {
506 unsigned long physbase, size;
507 unsigned long type = lmb.memory.region[i].type;
508
509 if ( type != LMB_MEMORY_AREA )
510 continue;
511
512 physbase = lmb.memory.region[i].physbase;
513 size = lmb.memory.region[i].size;
514 free_bootmem(physbase, size);
515 }
516 /* reserve the sections we're already using */
517 for (i=0; i < lmb.reserved.cnt; i++) {
518 unsigned long physbase = lmb.reserved.region[i].physbase;
519 unsigned long size = lmb.reserved.region[i].size;
520 #if 0 /* PPPBBB */
521 if ( (physbase == 0) && (size < (16<<20)) ) {
522 size = 16 << 20;
523 }
524 #endif
525 reserve_bootmem(physbase, size);
526 }
527
528 PPCDBG(PPCDBG_MMINIT, "do_init_bootmem: end\n");
529 }
530
531 /*
532 * paging_init() sets up the page tables - in fact we've already done this.
533 */
534 void __init paging_init(void)
535 {
536 unsigned long zones_size[MAX_NR_ZONES], i;
537
538 /*
539 * All pages are DMA-able so we put them all in the DMA zone.
540 */
541 zones_size[ZONE_DMA] = lmb_end_of_DRAM() >> PAGE_SHIFT;
542 for (i = 1; i < MAX_NR_ZONES; i++)
543 zones_size[i] = 0;
544 free_area_init(zones_size);
545 }
546
547 void initialize_paca_hardware_interrupt_stack(void);
548
549 void __init mem_init(void)
550 {
551 extern char *sysmap;
552 extern unsigned long sysmap_size;
553 unsigned long addr;
554 int codepages = 0;
555 int datapages = 0;
556 int initpages = 0;
557 unsigned long va_rtas_base = (unsigned long)__va(rtas.base);
558
559 max_mapnr = max_low_pfn;
560 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
561 num_physpages = max_mapnr; /* RAM is assumed contiguous */
562
563 totalram_pages += free_all_bootmem();
564
565 ifppcdebug(PPCDBG_MMINIT) {
566 udbg_printf("mem_init: totalram_pages = 0x%lx\n", totalram_pages);
567 udbg_printf("mem_init: va_rtas_base = 0x%lx\n", va_rtas_base);
568 udbg_printf("mem_init: va_rtas_end = 0x%lx\n", PAGE_ALIGN(va_rtas_base+rtas.size));
569 udbg_printf("mem_init: pinned start = 0x%lx\n", __va(0));
570 udbg_printf("mem_init: pinned end = 0x%lx\n", PAGE_ALIGN(klimit));
571 }
572
573 if ( sysmap_size )
574 for (addr = (unsigned long)sysmap;
575 addr < PAGE_ALIGN((unsigned long)sysmap+sysmap_size) ;
576 addr += PAGE_SIZE)
577 SetPageReserved(mem_map + MAP_NR(addr));
578
579 for (addr = KERNELBASE; addr <= (unsigned long)__va(lmb_end_of_DRAM());
580 addr += PAGE_SIZE) {
581 if (!PageReserved(mem_map + MAP_NR(addr)))
582 continue;
583 if (addr < (ulong) etext)
584 codepages++;
585
586 else if (addr >= (unsigned long)&__init_begin
587 && addr < (unsigned long)&__init_end)
588 initpages++;
589 else if (addr < klimit)
590 datapages++;
591 }
592
593 printk("Memory: %luk available (%dk kernel code, %dk data, %dk init) [%08lx,%08lx]\n",
594 (unsigned long)nr_free_pages()<< (PAGE_SHIFT-10),
595 codepages<< (PAGE_SHIFT-10), datapages<< (PAGE_SHIFT-10),
596 initpages<< (PAGE_SHIFT-10),
597 PAGE_OFFSET, (unsigned long)__va(lmb_end_of_DRAM()));
598 mem_init_done = 1;
599
600 /* set the last page of each hardware interrupt stack to be protected */
601 initialize_paca_hardware_interrupt_stack();
602
603 #ifdef CONFIG_PPC_ISERIES
604 create_virtual_bus_tce_table();
605 #endif
606 }
607
608 /*
609 * This is called when a page has been modified by the kernel.
610 * It just marks the page as not i-cache clean. We do the i-cache
611 * flush later when the page is given to a user process, if necessary.
612 */
613 void flush_dcache_page(struct page *page)
614 {
615 clear_bit(PG_arch_1, &page->flags);
616 }
617
618 void flush_icache_page(struct vm_area_struct *vma, struct page *page)
619 {
620 if (page->mapping && !PageReserved(page)
621 && !test_bit(PG_arch_1, &page->flags)) {
622 __flush_dcache_icache(page_address(page));
623 set_bit(PG_arch_1, &page->flags);
624 }
625 }
626
627 void clear_user_page(void *page, unsigned long vaddr)
628 {
629 clear_page(page);
630 __flush_dcache_icache(page);
631 }
632
633 void copy_user_page(void *vto, void *vfrom, unsigned long vaddr)
634 {
635 copy_page(vto, vfrom);
636 __flush_dcache_icache(vto);
637 }
638
639 void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
640 unsigned long addr, int len)
641 {
642 unsigned long maddr;
643
644 maddr = (unsigned long)page_address(page) + (addr & ~PAGE_MASK);
645 flush_icache_range(maddr, maddr + len);
646 }
647
648 #ifdef CONFIG_SHARED_MEMORY_ADDRESSING
649 static spinlock_t shared_malloc_lock = SPIN_LOCK_UNLOCKED;
650 struct vm_struct *shared_list = NULL;
651 static struct vm_struct *get_shared_area(unsigned long size,
652 unsigned long flags);
653
654 void *shared_malloc(unsigned long size)
655 {
656 pgprot_t prot;
657 struct vm_struct *area;
658 unsigned long ea;
659
660 spin_lock(&shared_malloc_lock);
661
662 printk("shared_malloc1 (no _PAGE_USER): addr = 0x%lx, size = 0x%lx\n",
663 SMALLOC_START, size);
664
665 area = get_shared_area(size, 0);
666 if (!area) {
667 spin_unlock(&shared_malloc_lock);
668 return NULL;
669 }
670
671 ea = (unsigned long) area->addr;
672
673 prot = __pgprot(pgprot_val(PAGE_KERNEL));
674 if (vmalloc_area_pages(VMALLOC_VMADDR(ea), size, GFP_KERNEL, prot)) {
675 spin_unlock(&shared_malloc_lock);
676 return NULL;
677 }
678
679 printk("shared_malloc: addr = 0x%lx, size = 0x%lx\n", ea, size);
680
681 spin_unlock(&shared_malloc_lock);
682 return(ea);
683 }
684
685 void shared_free(void *addr)
686 {
687 struct vm_struct **p, *tmp;
688
689 if (!addr)
690 return;
691 if ((PAGE_SIZE-1) & (unsigned long) addr) {
692 printk(KERN_ERR "Trying to shared_free() bad address (%p)\n",
693 addr);
694 return;
695 }
696 spin_lock(&shared_malloc_lock);
697
698 printk("shared_free: addr = 0x%p\n", addr);
699
700 /* Scan the memory list for an entry matching
701 * the address to be freed, get the size (in bytes)
702 * and free the entry. The list lock is not dropped
703 * until the page table entries are removed.
704 */
705 for(p = &shared_list; (tmp = *p); p = &tmp->next ) {
706 if (tmp->addr == addr) {
707 *p = tmp->next;
708 vmfree_area_pages(VMALLOC_VMADDR(tmp->addr),tmp->size);
709 spin_unlock(&shared_malloc_lock);
710 kfree(tmp);
711 return;
712 }
713 }
714
715 spin_unlock(&shared_malloc_lock);
716 printk("shared_free: error\n");
717 }
718
719 static struct vm_struct *get_shared_area(unsigned long size,
720 unsigned long flags)
721 {
722 unsigned long addr;
723 struct vm_struct **p, *tmp, *area;
724
725 area = (struct vm_struct *) kmalloc(sizeof(*area), GFP_KERNEL);
726 if (!area) return NULL;
727
728 size += PAGE_SIZE;
729 if (!size) {
730 kfree (area);
731 return NULL;
732 }
733
734 addr = SMALLOC_START;
735 for (p = &shared_list; (tmp = *p) ; p = &tmp->next) {
736 if ((size + addr) < addr) {
737 kfree(area);
738 return NULL;
739 }
740 if (size + addr <= (unsigned long) tmp->addr)
741 break;
742 addr = tmp->size + (unsigned long) tmp->addr;
743 if (addr > SMALLOC_END-size) {
744 kfree(area);
745 return NULL;
746 }
747 }
748
749 if (addr + size > SMALLOC_END) {
750 kfree(area);
751 return NULL;
752 }
753 area->flags = flags;
754 area->addr = (void *)addr;
755 area->size = size;
756 area->next = *p;
757 *p = area;
758 return area;
759 }
760
761 int shared_task_mark(void)
762 {
763 current->thread.flags |= PPC_FLAG_SHARED;
764 printk("current->thread.flags = 0x%lx\n", current->thread.flags);
765
766 return 0;
767 }
768
769 int shared_task_unmark()
770 {
771 if(current->thread.flags & PPC_FLAG_SHARED) {
772 current->thread.flags &= (~PPC_FLAG_SHARED);
773 return 0;
774 } else {
775 return -1;
776 }
777 }
778 #endif
779
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