1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/parisc/mm/init.c
5 * Copyright (C) 1995 Linus Torvalds
6 * Copyright 1999 SuSE GmbH
7 * changed by Philipp Rumpf
8 * Copyright 1999 Philipp Rumpf (prumpf@tux.org)
9 * Copyright 2004 Randolph Chung (tausq@debian.org)
10 * Copyright 2006-2007 Helge Deller (deller@gmx.de)
15 #include <linux/module.h>
17 #include <linux/memblock.h>
18 #include <linux/gfp.h>
19 #include <linux/delay.h>
20 #include <linux/init.h>
21 #include <linux/initrd.h>
22 #include <linux/swap.h>
23 #include <linux/unistd.h>
24 #include <linux/nodemask.h> /* for node_online_map */
25 #include <linux/pagemap.h> /* for release_pages */
26 #include <linux/compat.h>
28 #include <asm/pgalloc.h>
29 #include <asm/pgtable.h>
31 #include <asm/pdc_chassis.h>
32 #include <asm/mmzone.h>
33 #include <asm/sections.h>
34 #include <asm/msgbuf.h>
35 #include <asm/sparsemem.h>
37 extern int data_start;
38 extern void parisc_kernel_start(void); /* Kernel entry point in head.S */
40 #if CONFIG_PGTABLE_LEVELS == 3
41 /* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout
42 * with the first pmd adjacent to the pgd and below it. gcc doesn't actually
43 * guarantee that global objects will be laid out in memory in the same order
44 * as the order of declaration, so put these in different sections and use
45 * the linker script to order them. */
46 pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE)));
49 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE)));
50 pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE)));
52 static struct resource data_resource = {
53 .name = "Kernel data",
54 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
57 static struct resource code_resource = {
58 .name = "Kernel code",
59 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
62 static struct resource pdcdata_resource = {
63 .name = "PDC data (Page Zero)",
66 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
69 static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __ro_after_init;
71 /* The following array is initialized from the firmware specific
72 * information retrieved in kernel/inventory.c.
75 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __initdata;
76 int npmem_ranges __initdata;
79 #define MAX_MEM (1UL << MAX_PHYSMEM_BITS)
80 #else /* !CONFIG_64BIT */
81 #define MAX_MEM (3584U*1024U*1024U)
82 #endif /* !CONFIG_64BIT */
84 static unsigned long mem_limit __read_mostly = MAX_MEM;
86 static void __init mem_limit_func(void)
91 /* We need this before __setup() functions are called */
94 for (cp = boot_command_line; *cp; ) {
95 if (memcmp(cp, "mem=", 4) == 0) {
97 limit = memparse(cp, &end);
102 while (*cp != ' ' && *cp)
109 if (limit < mem_limit)
113 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
115 static void __init setup_bootmem(void)
117 unsigned long mem_max;
118 #ifndef CONFIG_SPARSEMEM
119 physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
122 int i, sysram_resource_count;
124 disable_sr_hashing(); /* Turn off space register hashing */
127 * Sort the ranges. Since the number of ranges is typically
128 * small, and performance is not an issue here, just do
129 * a simple insertion sort.
132 for (i = 1; i < npmem_ranges; i++) {
135 for (j = i; j > 0; j--) {
138 if (pmem_ranges[j-1].start_pfn <
139 pmem_ranges[j].start_pfn) {
143 tmp = pmem_ranges[j-1];
144 pmem_ranges[j-1] = pmem_ranges[j];
145 pmem_ranges[j] = tmp;
149 #ifndef CONFIG_SPARSEMEM
151 * Throw out ranges that are too far apart (controlled by
155 for (i = 1; i < npmem_ranges; i++) {
156 if (pmem_ranges[i].start_pfn -
157 (pmem_ranges[i-1].start_pfn +
158 pmem_ranges[i-1].pages) > MAX_GAP) {
160 printk("Large gap in memory detected (%ld pages). "
161 "Consider turning on CONFIG_SPARSEMEM\n",
162 pmem_ranges[i].start_pfn -
163 (pmem_ranges[i-1].start_pfn +
164 pmem_ranges[i-1].pages));
170 /* Print the memory ranges */
171 pr_info("Memory Ranges:\n");
173 for (i = 0; i < npmem_ranges; i++) {
174 struct resource *res = &sysram_resources[i];
178 size = (pmem_ranges[i].pages << PAGE_SHIFT);
179 start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
180 pr_info("%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
181 i, start, start + (size - 1), size >> 20);
183 /* request memory resource */
184 res->name = "System RAM";
186 res->end = start + size - 1;
187 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
188 request_resource(&iomem_resource, res);
191 sysram_resource_count = npmem_ranges;
194 * For 32 bit kernels we limit the amount of memory we can
195 * support, in order to preserve enough kernel address space
196 * for other purposes. For 64 bit kernels we don't normally
197 * limit the memory, but this mechanism can be used to
198 * artificially limit the amount of memory (and it is written
199 * to work with multiple memory ranges).
202 mem_limit_func(); /* check for "mem=" argument */
205 for (i = 0; i < npmem_ranges; i++) {
208 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
209 if ((mem_max + rsize) > mem_limit) {
210 printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
211 if (mem_max == mem_limit)
214 pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT)
215 - (mem_max >> PAGE_SHIFT);
216 npmem_ranges = i + 1;
224 printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
226 #ifndef CONFIG_SPARSEMEM
227 /* Merge the ranges, keeping track of the holes */
229 unsigned long end_pfn;
230 unsigned long hole_pages;
233 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
234 for (i = 1; i < npmem_ranges; i++) {
236 hole_pages = pmem_ranges[i].start_pfn - end_pfn;
238 pmem_holes[npmem_holes].start_pfn = end_pfn;
239 pmem_holes[npmem_holes++].pages = hole_pages;
240 end_pfn += hole_pages;
242 end_pfn += pmem_ranges[i].pages;
245 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
251 * Initialize and free the full range of memory in each range.
255 for (i = 0; i < npmem_ranges; i++) {
256 unsigned long start_pfn;
257 unsigned long npages;
261 start_pfn = pmem_ranges[i].start_pfn;
262 npages = pmem_ranges[i].pages;
264 start = start_pfn << PAGE_SHIFT;
265 size = npages << PAGE_SHIFT;
267 /* add system RAM memblock */
268 memblock_add(start, size);
270 if ((start_pfn + npages) > max_pfn)
271 max_pfn = start_pfn + npages;
275 * We can't use memblock top-down allocations because we only
276 * created the initial mapping up to KERNEL_INITIAL_SIZE in
277 * the assembly bootup code.
279 memblock_set_bottom_up(true);
281 /* IOMMU is always used to access "high mem" on those boxes
282 * that can support enough mem that a PCI device couldn't
283 * directly DMA to any physical addresses.
284 * ISA DMA support will need to revisit this.
286 max_low_pfn = max_pfn;
288 /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
290 #define PDC_CONSOLE_IO_IODC_SIZE 32768
292 memblock_reserve(0UL, (unsigned long)(PAGE0->mem_free +
293 PDC_CONSOLE_IO_IODC_SIZE));
294 memblock_reserve(__pa(KERNEL_BINARY_TEXT_START),
295 (unsigned long)(_end - KERNEL_BINARY_TEXT_START));
297 #ifndef CONFIG_SPARSEMEM
299 /* reserve the holes */
301 for (i = 0; i < npmem_holes; i++) {
302 memblock_reserve((pmem_holes[i].start_pfn << PAGE_SHIFT),
303 (pmem_holes[i].pages << PAGE_SHIFT));
307 #ifdef CONFIG_BLK_DEV_INITRD
309 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
310 if (__pa(initrd_start) < mem_max) {
311 unsigned long initrd_reserve;
313 if (__pa(initrd_end) > mem_max) {
314 initrd_reserve = mem_max - __pa(initrd_start);
316 initrd_reserve = initrd_end - initrd_start;
318 initrd_below_start_ok = 1;
319 printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
321 memblock_reserve(__pa(initrd_start), initrd_reserve);
326 data_resource.start = virt_to_phys(&data_start);
327 data_resource.end = virt_to_phys(_end) - 1;
328 code_resource.start = virt_to_phys(_text);
329 code_resource.end = virt_to_phys(&data_start)-1;
331 /* We don't know which region the kernel will be in, so try
334 for (i = 0; i < sysram_resource_count; i++) {
335 struct resource *res = &sysram_resources[i];
336 request_resource(res, &code_resource);
337 request_resource(res, &data_resource);
339 request_resource(&sysram_resources[0], &pdcdata_resource);
341 /* Initialize Page Deallocation Table (PDT) and check for bad memory. */
344 memblock_allow_resize();
348 static bool kernel_set_to_readonly;
350 static void __ref map_pages(unsigned long start_vaddr,
351 unsigned long start_paddr, unsigned long size,
352 pgprot_t pgprot, int force)
357 unsigned long end_paddr;
358 unsigned long start_pmd;
359 unsigned long start_pte;
362 unsigned long address;
364 unsigned long ro_start;
365 unsigned long ro_end;
366 unsigned long kernel_start, kernel_end;
368 ro_start = __pa((unsigned long)_text);
369 ro_end = __pa((unsigned long)&data_start);
370 kernel_start = __pa((unsigned long)&__init_begin);
371 kernel_end = __pa((unsigned long)&_end);
373 end_paddr = start_paddr + size;
375 pg_dir = pgd_offset_k(start_vaddr);
377 #if PTRS_PER_PMD == 1
380 start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
382 start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
384 address = start_paddr;
386 while (address < end_paddr) {
387 #if PTRS_PER_PMD == 1
388 pmd = (pmd_t *)__pa(pg_dir);
390 pmd = (pmd_t *)pgd_address(*pg_dir);
393 * pmd is physical at this point
397 pmd = memblock_alloc(PAGE_SIZE << PMD_ORDER,
398 PAGE_SIZE << PMD_ORDER);
400 panic("pmd allocation failed.\n");
401 pmd = (pmd_t *) __pa(pmd);
404 pgd_populate(NULL, pg_dir, __va(pmd));
408 /* now change pmd to kernel virtual addresses */
410 pmd = (pmd_t *)__va(pmd) + start_pmd;
411 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
414 * pg_table is physical at this point
417 pg_table = (pte_t *)pmd_address(*pmd);
419 pg_table = memblock_alloc(PAGE_SIZE,
422 panic("page table allocation failed\n");
423 pg_table = (pte_t *) __pa(pg_table);
426 pmd_populate_kernel(NULL, pmd, __va(pg_table));
428 /* now change pg_table to kernel virtual addresses */
430 pg_table = (pte_t *) __va(pg_table) + start_pte;
431 for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
438 } else if (address < kernel_start || address >= kernel_end) {
439 /* outside kernel memory */
441 } else if (!kernel_set_to_readonly) {
442 /* still initializing, allow writing to RO memory */
443 prot = PAGE_KERNEL_RWX;
445 } else if (address >= ro_start) {
446 /* Code (ro) and Data areas */
447 prot = (address < ro_end) ?
448 PAGE_KERNEL_EXEC : PAGE_KERNEL;
454 pte = __mk_pte(address, prot);
456 pte = pte_mkhuge(pte);
458 if (address >= end_paddr)
461 set_pte(pg_table, pte);
463 address += PAGE_SIZE;
468 if (address >= end_paddr)
475 void __init set_kernel_text_rw(int enable_read_write)
477 unsigned long start = (unsigned long) __init_begin;
478 unsigned long end = (unsigned long) &data_start;
480 map_pages(start, __pa(start), end-start,
481 PAGE_KERNEL_RWX, enable_read_write ? 1:0);
483 /* force the kernel to see the new page table entries */
488 void free_initmem(void)
490 unsigned long init_begin = (unsigned long)__init_begin;
491 unsigned long init_end = (unsigned long)__init_end;
492 unsigned long kernel_end = (unsigned long)&_end;
494 /* Remap kernel text and data, but do not touch init section yet. */
495 kernel_set_to_readonly = true;
496 map_pages(init_end, __pa(init_end), kernel_end - init_end,
499 /* The init text pages are marked R-X. We have to
500 * flush the icache and mark them RW-
502 * Do a dummy remap of the data section first (the data
503 * section is already PAGE_KERNEL) to pull in the TLB entries
505 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
507 /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
509 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
512 /* force the kernel to see the new TLB entries */
513 __flush_tlb_range(0, init_begin, kernel_end);
515 /* finally dump all the instructions which were cached, since the
516 * pages are no-longer executable */
517 flush_icache_range(init_begin, init_end);
519 free_initmem_default(POISON_FREE_INITMEM);
521 /* set up a new led state on systems shipped LED State panel */
522 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
526 #ifdef CONFIG_STRICT_KERNEL_RWX
527 void mark_rodata_ro(void)
529 /* rodata memory was already mapped with KERNEL_RO access rights by
530 pagetable_init() and map_pages(). No need to do additional stuff here */
531 unsigned long roai_size = __end_ro_after_init - __start_ro_after_init;
533 pr_info("Write protected read-only-after-init data: %luk\n", roai_size >> 10);
539 * Just an arbitrary offset to serve as a "hole" between mapping areas
540 * (between top of physical memory and a potential pcxl dma mapping
541 * area, and below the vmalloc mapping area).
543 * The current 32K value just means that there will be a 32K "hole"
544 * between mapping areas. That means that any out-of-bounds memory
545 * accesses will hopefully be caught. The vmalloc() routines leaves
546 * a hole of 4kB between each vmalloced area for the same reason.
549 /* Leave room for gateway page expansion */
550 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
551 #error KERNEL_MAP_START is in gateway reserved region
553 #define MAP_START (KERNEL_MAP_START)
555 #define VM_MAP_OFFSET (32*1024)
556 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
557 & ~(VM_MAP_OFFSET-1)))
559 void *parisc_vmalloc_start __ro_after_init;
560 EXPORT_SYMBOL(parisc_vmalloc_start);
563 unsigned long pcxl_dma_start __ro_after_init;
566 void __init mem_init(void)
568 /* Do sanity checks on IPC (compat) structures */
569 BUILD_BUG_ON(sizeof(struct ipc64_perm) != 48);
571 BUILD_BUG_ON(sizeof(struct semid64_ds) != 80);
572 BUILD_BUG_ON(sizeof(struct msqid64_ds) != 104);
573 BUILD_BUG_ON(sizeof(struct shmid64_ds) != 104);
576 BUILD_BUG_ON(sizeof(struct compat_ipc64_perm) != sizeof(struct ipc64_perm));
577 BUILD_BUG_ON(sizeof(struct compat_semid64_ds) != 80);
578 BUILD_BUG_ON(sizeof(struct compat_msqid64_ds) != 104);
579 BUILD_BUG_ON(sizeof(struct compat_shmid64_ds) != 104);
582 /* Do sanity checks on page table constants */
583 BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
584 BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
585 BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
586 BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
589 high_memory = __va((max_pfn << PAGE_SHIFT));
590 set_max_mapnr(max_low_pfn);
594 if (boot_cpu_data.cpu_type == pcxl2 || boot_cpu_data.cpu_type == pcxl) {
595 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
596 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
597 + PCXL_DMA_MAP_SIZE);
600 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
602 mem_init_print_info(NULL);
606 * Do not expose the virtual kernel memory layout to userspace.
607 * But keep code for debugging purposes.
609 printk("virtual kernel memory layout:\n"
610 " vmalloc : 0x%px - 0x%px (%4ld MB)\n"
611 " fixmap : 0x%px - 0x%px (%4ld kB)\n"
612 " memory : 0x%px - 0x%px (%4ld MB)\n"
613 " .init : 0x%px - 0x%px (%4ld kB)\n"
614 " .data : 0x%px - 0x%px (%4ld kB)\n"
615 " .text : 0x%px - 0x%px (%4ld kB)\n",
617 (void*)VMALLOC_START, (void*)VMALLOC_END,
618 (VMALLOC_END - VMALLOC_START) >> 20,
620 (void *)FIXMAP_START, (void *)(FIXMAP_START + FIXMAP_SIZE),
621 (unsigned long)(FIXMAP_SIZE / 1024),
623 __va(0), high_memory,
624 ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
626 __init_begin, __init_end,
627 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
630 ((unsigned long)_edata - (unsigned long)_etext) >> 10,
633 ((unsigned long)_etext - (unsigned long)_text) >> 10);
637 unsigned long *empty_zero_page __ro_after_init;
638 EXPORT_SYMBOL(empty_zero_page);
641 * pagetable_init() sets up the page tables
643 * Note that gateway_init() places the Linux gateway page at page 0.
644 * Since gateway pages cannot be dereferenced this has the desirable
645 * side effect of trapping those pesky NULL-reference errors in the
648 static void __init pagetable_init(void)
652 /* Map each physical memory range to its kernel vaddr */
654 for (range = 0; range < npmem_ranges; range++) {
655 unsigned long start_paddr;
656 unsigned long end_paddr;
659 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
660 size = pmem_ranges[range].pages << PAGE_SHIFT;
661 end_paddr = start_paddr + size;
663 map_pages((unsigned long)__va(start_paddr), start_paddr,
664 size, PAGE_KERNEL, 0);
667 #ifdef CONFIG_BLK_DEV_INITRD
668 if (initrd_end && initrd_end > mem_limit) {
669 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
670 map_pages(initrd_start, __pa(initrd_start),
671 initrd_end - initrd_start, PAGE_KERNEL, 0);
675 empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
676 if (!empty_zero_page)
677 panic("zero page allocation failed.\n");
681 static void __init gateway_init(void)
683 unsigned long linux_gateway_page_addr;
684 /* FIXME: This is 'const' in order to trick the compiler
685 into not treating it as DP-relative data. */
686 extern void * const linux_gateway_page;
688 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
691 * Setup Linux Gateway page.
693 * The Linux gateway page will reside in kernel space (on virtual
694 * page 0), so it doesn't need to be aliased into user space.
697 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
698 PAGE_SIZE, PAGE_GATEWAY, 1);
701 static void __init parisc_bootmem_free(void)
703 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
704 unsigned long holes_size[MAX_NR_ZONES] = { 0, };
705 unsigned long mem_start_pfn = ~0UL, mem_end_pfn = 0, mem_size_pfn = 0;
708 for (i = 0; i < npmem_ranges; i++) {
709 unsigned long start = pmem_ranges[i].start_pfn;
710 unsigned long size = pmem_ranges[i].pages;
711 unsigned long end = start + size;
713 if (mem_start_pfn > start)
714 mem_start_pfn = start;
715 if (mem_end_pfn < end)
717 mem_size_pfn += size;
720 zones_size[0] = mem_end_pfn - mem_start_pfn;
721 holes_size[0] = zones_size[0] - mem_size_pfn;
723 free_area_init_node(0, zones_size, mem_start_pfn, holes_size);
726 void __init paging_init(void)
731 flush_cache_all_local(); /* start with known state */
732 flush_tlb_all_local(NULL);
735 * Mark all memblocks as present for sparsemem using
736 * memory_present() and then initialize sparsemem.
740 parisc_bootmem_free();
746 * Currently, all PA20 chips have 18 bit protection IDs, which is the
747 * limiting factor (space ids are 32 bits).
750 #define NR_SPACE_IDS 262144
755 * Currently we have a one-to-one relationship between space IDs and
756 * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
757 * support 15 bit protection IDs, so that is the limiting factor.
758 * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
759 * probably not worth the effort for a special case here.
762 #define NR_SPACE_IDS 32768
764 #endif /* !CONFIG_PA20 */
766 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
767 #define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long)))
769 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
770 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
771 static unsigned long space_id_index;
772 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
773 static unsigned long dirty_space_ids = 0;
775 static DEFINE_SPINLOCK(sid_lock);
777 unsigned long alloc_sid(void)
781 spin_lock(&sid_lock);
783 if (free_space_ids == 0) {
784 if (dirty_space_ids != 0) {
785 spin_unlock(&sid_lock);
786 flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
787 spin_lock(&sid_lock);
789 BUG_ON(free_space_ids == 0);
794 index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
795 space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
796 space_id_index = index;
798 spin_unlock(&sid_lock);
800 return index << SPACEID_SHIFT;
803 void free_sid(unsigned long spaceid)
805 unsigned long index = spaceid >> SPACEID_SHIFT;
806 unsigned long *dirty_space_offset;
808 dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
809 index &= (BITS_PER_LONG - 1);
811 spin_lock(&sid_lock);
813 BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
815 *dirty_space_offset |= (1L << index);
818 spin_unlock(&sid_lock);
823 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
827 /* NOTE: sid_lock must be held upon entry */
829 *ndirtyptr = dirty_space_ids;
830 if (dirty_space_ids != 0) {
831 for (i = 0; i < SID_ARRAY_SIZE; i++) {
832 dirty_array[i] = dirty_space_id[i];
833 dirty_space_id[i] = 0;
841 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
845 /* NOTE: sid_lock must be held upon entry */
848 for (i = 0; i < SID_ARRAY_SIZE; i++) {
849 space_id[i] ^= dirty_array[i];
852 free_space_ids += ndirty;
857 #else /* CONFIG_SMP */
859 static void recycle_sids(void)
863 /* NOTE: sid_lock must be held upon entry */
865 if (dirty_space_ids != 0) {
866 for (i = 0; i < SID_ARRAY_SIZE; i++) {
867 space_id[i] ^= dirty_space_id[i];
868 dirty_space_id[i] = 0;
871 free_space_ids += dirty_space_ids;
879 * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
880 * purged, we can safely reuse the space ids that were released but
881 * not flushed from the tlb.
886 static unsigned long recycle_ndirty;
887 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
888 static unsigned int recycle_inuse;
890 void flush_tlb_all(void)
895 spin_lock(&sid_lock);
896 __inc_irq_stat(irq_tlb_count);
897 if (dirty_space_ids > RECYCLE_THRESHOLD) {
898 BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */
899 get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
903 spin_unlock(&sid_lock);
904 on_each_cpu(flush_tlb_all_local, NULL, 1);
906 spin_lock(&sid_lock);
907 recycle_sids(recycle_ndirty,recycle_dirty_array);
909 spin_unlock(&sid_lock);
913 void flush_tlb_all(void)
915 spin_lock(&sid_lock);
916 __inc_irq_stat(irq_tlb_count);
917 flush_tlb_all_local(NULL);
919 spin_unlock(&sid_lock);