2 * linux/arch/i386/mm/init.c
4 * Copyright (C) 1995 Linus Torvalds
6 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
9 #include <linux/module.h>
10 #include <linux/signal.h>
11 #include <linux/sched.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/types.h>
16 #include <linux/ptrace.h>
17 #include <linux/mman.h>
19 #include <linux/hugetlb.h>
20 #include <linux/swap.h>
21 #include <linux/smp.h>
22 #include <linux/init.h>
23 #include <linux/highmem.h>
24 #include <linux/pagemap.h>
25 #include <linux/pfn.h>
26 #include <linux/poison.h>
27 #include <linux/bootmem.h>
28 #include <linux/slab.h>
29 #include <linux/proc_fs.h>
30 #include <linux/memory_hotplug.h>
31 #include <linux/initrd.h>
32 #include <linux/cpumask.h>
34 #include <asm/processor.h>
35 #include <asm/system.h>
36 #include <asm/uaccess.h>
37 #include <asm/pgtable.h>
39 #include <asm/fixmap.h>
43 #include <asm/tlbflush.h>
44 #include <asm/pgalloc.h>
45 #include <asm/sections.h>
46 #include <asm/paravirt.h>
48 unsigned int __VMALLOC_RESERVE
= 128 << 20;
50 DEFINE_PER_CPU(struct mmu_gather
, mmu_gathers
);
51 unsigned long highstart_pfn
, highend_pfn
;
53 static int noinline
do_test_wp_bit(void);
56 * Creates a middle page table and puts a pointer to it in the
57 * given global directory entry. This only returns the gd entry
58 * in non-PAE compilation mode, since the middle layer is folded.
60 static pmd_t
* __init
one_md_table_init(pgd_t
*pgd
)
66 if (!(pgd_val(*pgd
) & _PAGE_PRESENT
)) {
67 pmd_table
= (pmd_t
*) alloc_bootmem_low_pages(PAGE_SIZE
);
69 paravirt_alloc_pd(&init_mm
, __pa(pmd_table
) >> PAGE_SHIFT
);
70 set_pgd(pgd
, __pgd(__pa(pmd_table
) | _PAGE_PRESENT
));
71 pud
= pud_offset(pgd
, 0);
72 if (pmd_table
!= pmd_offset(pud
, 0))
76 pud
= pud_offset(pgd
, 0);
77 pmd_table
= pmd_offset(pud
, 0);
82 * Create a page table and place a pointer to it in a middle page
85 static pte_t
* __init
one_page_table_init(pmd_t
*pmd
)
87 if (!(pmd_val(*pmd
) & _PAGE_PRESENT
)) {
88 pte_t
*page_table
= NULL
;
90 #ifdef CONFIG_DEBUG_PAGEALLOC
91 page_table
= (pte_t
*) alloc_bootmem_pages(PAGE_SIZE
);
95 (pte_t
*)alloc_bootmem_low_pages(PAGE_SIZE
);
97 paravirt_alloc_pt(&init_mm
, __pa(page_table
) >> PAGE_SHIFT
);
98 set_pmd(pmd
, __pmd(__pa(page_table
) | _PAGE_TABLE
));
99 BUG_ON(page_table
!= pte_offset_kernel(pmd
, 0));
102 return pte_offset_kernel(pmd
, 0);
106 * This function initializes a certain range of kernel virtual memory
107 * with new bootmem page tables, everywhere page tables are missing in
112 * NOTE: The pagetables are allocated contiguous on the physical space
113 * so we can cache the place of the first one and move around without
114 * checking the pgd every time.
116 static void __init
page_table_range_init (unsigned long start
, unsigned long end
, pgd_t
*pgd_base
)
120 int pgd_idx
, pmd_idx
;
124 pgd_idx
= pgd_index(vaddr
);
125 pmd_idx
= pmd_index(vaddr
);
126 pgd
= pgd_base
+ pgd_idx
;
128 for ( ; (pgd_idx
< PTRS_PER_PGD
) && (vaddr
!= end
); pgd
++, pgd_idx
++) {
129 pmd
= one_md_table_init(pgd
);
130 pmd
= pmd
+ pmd_index(vaddr
);
131 for (; (pmd_idx
< PTRS_PER_PMD
) && (vaddr
!= end
); pmd
++, pmd_idx
++) {
132 one_page_table_init(pmd
);
140 static inline int is_kernel_text(unsigned long addr
)
142 if (addr
>= PAGE_OFFSET
&& addr
<= (unsigned long)__init_end
)
148 * This maps the physical memory to kernel virtual address space, a total
149 * of max_low_pfn pages, by creating page tables starting from address
152 static void __init
kernel_physical_mapping_init(pgd_t
*pgd_base
)
158 int pgd_idx
, pmd_idx
, pte_ofs
;
160 pgd_idx
= pgd_index(PAGE_OFFSET
);
161 pgd
= pgd_base
+ pgd_idx
;
164 for (; pgd_idx
< PTRS_PER_PGD
; pgd
++, pgd_idx
++) {
165 pmd
= one_md_table_init(pgd
);
166 if (pfn
>= max_low_pfn
)
169 pmd_idx
< PTRS_PER_PMD
&& pfn
< max_low_pfn
;
171 unsigned int address
= pfn
* PAGE_SIZE
+ PAGE_OFFSET
;
173 /* Map with big pages if possible, otherwise
174 create normal page tables. */
176 unsigned int address2
;
177 pgprot_t prot
= PAGE_KERNEL_LARGE
;
179 address2
= (pfn
+ PTRS_PER_PTE
- 1) * PAGE_SIZE
+
180 PAGE_OFFSET
+ PAGE_SIZE
-1;
182 if (is_kernel_text(address
) ||
183 is_kernel_text(address2
))
184 prot
= PAGE_KERNEL_LARGE_EXEC
;
186 set_pmd(pmd
, pfn_pmd(pfn
, prot
));
190 pte
= one_page_table_init(pmd
);
193 pte_ofs
< PTRS_PER_PTE
&& pfn
< max_low_pfn
;
194 pte
++, pfn
++, pte_ofs
++, address
+= PAGE_SIZE
) {
195 pgprot_t prot
= PAGE_KERNEL
;
197 if (is_kernel_text(address
))
198 prot
= PAGE_KERNEL_EXEC
;
200 set_pte(pte
, pfn_pte(pfn
, prot
));
207 static inline int page_kills_ppro(unsigned long pagenr
)
209 if (pagenr
>= 0x70000 && pagenr
<= 0x7003F)
214 #ifdef CONFIG_HIGHMEM
218 #define kmap_get_fixmap_pte(vaddr) \
219 pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), vaddr), (vaddr)), (vaddr))
221 static void __init
kmap_init(void)
223 unsigned long kmap_vstart
;
225 /* cache the first kmap pte */
226 kmap_vstart
= __fix_to_virt(FIX_KMAP_BEGIN
);
227 kmap_pte
= kmap_get_fixmap_pte(kmap_vstart
);
229 kmap_prot
= PAGE_KERNEL
;
232 static void __init
permanent_kmaps_init(pgd_t
*pgd_base
)
241 page_table_range_init(vaddr
, vaddr
+ PAGE_SIZE
*LAST_PKMAP
, pgd_base
);
243 pgd
= swapper_pg_dir
+ pgd_index(vaddr
);
244 pud
= pud_offset(pgd
, vaddr
);
245 pmd
= pmd_offset(pud
, vaddr
);
246 pte
= pte_offset_kernel(pmd
, vaddr
);
247 pkmap_page_table
= pte
;
250 static void __meminit
free_new_highpage(struct page
*page
)
252 init_page_count(page
);
257 void __init
add_one_highpage_init(struct page
*page
, int pfn
, int bad_ppro
)
259 if (page_is_ram(pfn
) && !(bad_ppro
&& page_kills_ppro(pfn
))) {
260 ClearPageReserved(page
);
261 free_new_highpage(page
);
263 SetPageReserved(page
);
266 static int __meminit
add_one_highpage_hotplug(struct page
*page
, unsigned long pfn
)
268 free_new_highpage(page
);
270 #ifdef CONFIG_FLATMEM
271 max_mapnr
= max(pfn
, max_mapnr
);
278 * Not currently handling the NUMA case.
279 * Assuming single node and all memory that
280 * has been added dynamically that would be
281 * onlined here is in HIGHMEM
283 void __meminit
online_page(struct page
*page
)
285 ClearPageReserved(page
);
286 add_one_highpage_hotplug(page
, page_to_pfn(page
));
291 extern void set_highmem_pages_init(int);
293 static void __init
set_highmem_pages_init(int bad_ppro
)
296 for (pfn
= highstart_pfn
; pfn
< highend_pfn
; pfn
++) {
298 * Holes under sparsemem might not have no mem_map[]:
301 add_one_highpage_init(pfn_to_page(pfn
), pfn
, bad_ppro
);
303 totalram_pages
+= totalhigh_pages
;
305 #endif /* CONFIG_FLATMEM */
308 #define kmap_init() do { } while (0)
309 #define permanent_kmaps_init(pgd_base) do { } while (0)
310 #define set_highmem_pages_init(bad_ppro) do { } while (0)
311 #endif /* CONFIG_HIGHMEM */
313 pteval_t __PAGE_KERNEL
= _PAGE_KERNEL
;
314 EXPORT_SYMBOL(__PAGE_KERNEL
);
315 pteval_t __PAGE_KERNEL_EXEC
= _PAGE_KERNEL_EXEC
;
318 extern void __init
remap_numa_kva(void);
320 #define remap_numa_kva() do {} while (0)
323 void __init
native_pagetable_setup_start(pgd_t
*base
)
325 #ifdef CONFIG_X86_PAE
329 * Init entries of the first-level page table to the
330 * zero page, if they haven't already been set up.
332 * In a normal native boot, we'll be running on a
333 * pagetable rooted in swapper_pg_dir, but not in PAE
334 * mode, so this will end up clobbering the mappings
335 * for the lower 24Mbytes of the address space,
336 * without affecting the kernel address space.
338 for (i
= 0; i
< USER_PTRS_PER_PGD
; i
++)
340 __pgd(__pa(empty_zero_page
) | _PAGE_PRESENT
));
342 /* Make sure kernel address space is empty so that a pagetable
343 will be allocated for it. */
344 memset(&base
[USER_PTRS_PER_PGD
], 0,
345 KERNEL_PGD_PTRS
* sizeof(pgd_t
));
347 paravirt_alloc_pd(&init_mm
, __pa(base
) >> PAGE_SHIFT
);
351 void __init
native_pagetable_setup_done(pgd_t
*base
)
353 #ifdef CONFIG_X86_PAE
355 * Add low memory identity-mappings - SMP needs it when
356 * starting up on an AP from real-mode. In the non-PAE
357 * case we already have these mappings through head.S.
358 * All user-space mappings are explicitly cleared after
361 set_pgd(&base
[0], base
[USER_PTRS_PER_PGD
]);
366 * Build a proper pagetable for the kernel mappings. Up until this
367 * point, we've been running on some set of pagetables constructed by
370 * If we're booting on native hardware, this will be a pagetable
371 * constructed in arch/i386/kernel/head.S, and not running in PAE mode
372 * (even if we'll end up running in PAE). The root of the pagetable
373 * will be swapper_pg_dir.
375 * If we're booting paravirtualized under a hypervisor, then there are
376 * more options: we may already be running PAE, and the pagetable may
377 * or may not be based in swapper_pg_dir. In any case,
378 * paravirt_pagetable_setup_start() will set up swapper_pg_dir
379 * appropriately for the rest of the initialization to work.
381 * In general, pagetable_init() assumes that the pagetable may already
382 * be partially populated, and so it avoids stomping on any existing
385 static void __init
pagetable_init (void)
387 unsigned long vaddr
, end
;
388 pgd_t
*pgd_base
= swapper_pg_dir
;
390 paravirt_pagetable_setup_start(pgd_base
);
392 /* Enable PSE if available */
394 set_in_cr4(X86_CR4_PSE
);
396 /* Enable PGE if available */
398 set_in_cr4(X86_CR4_PGE
);
399 __PAGE_KERNEL
|= _PAGE_GLOBAL
;
400 __PAGE_KERNEL_EXEC
|= _PAGE_GLOBAL
;
403 kernel_physical_mapping_init(pgd_base
);
407 * Fixed mappings, only the page table structure has to be
408 * created - mappings will be set by set_fixmap():
410 early_ioremap_clear();
411 vaddr
= __fix_to_virt(__end_of_fixed_addresses
- 1) & PMD_MASK
;
412 end
= (FIXADDR_TOP
+ PMD_SIZE
- 1) & PMD_MASK
;
413 page_table_range_init(vaddr
, end
, pgd_base
);
414 early_ioremap_reset();
416 permanent_kmaps_init(pgd_base
);
418 paravirt_pagetable_setup_done(pgd_base
);
421 #if defined(CONFIG_HIBERNATION) || defined(CONFIG_ACPI)
423 * Swap suspend & friends need this for resume because things like the intel-agp
424 * driver might have split up a kernel 4MB mapping.
426 char __nosavedata swsusp_pg_dir
[PAGE_SIZE
]
427 __attribute__ ((aligned (PAGE_SIZE
)));
429 static inline void save_pg_dir(void)
431 memcpy(swsusp_pg_dir
, swapper_pg_dir
, PAGE_SIZE
);
434 static inline void save_pg_dir(void)
439 void zap_low_mappings (void)
446 * Zap initial low-memory mappings.
448 * Note that "pgd_clear()" doesn't do it for
449 * us, because pgd_clear() is a no-op on i386.
451 for (i
= 0; i
< USER_PTRS_PER_PGD
; i
++)
452 #ifdef CONFIG_X86_PAE
453 set_pgd(swapper_pg_dir
+i
, __pgd(1 + __pa(empty_zero_page
)));
455 set_pgd(swapper_pg_dir
+i
, __pgd(0));
462 pteval_t __supported_pte_mask __read_mostly
= ~_PAGE_NX
;
463 EXPORT_SYMBOL_GPL(__supported_pte_mask
);
465 #ifdef CONFIG_X86_PAE
467 static int disable_nx __initdata
= 0;
472 * Control non executable mappings.
477 static int __init
noexec_setup(char *str
)
479 if (!str
|| !strcmp(str
, "on")) {
481 __supported_pte_mask
|= _PAGE_NX
;
484 } else if (!strcmp(str
,"off")) {
486 __supported_pte_mask
&= ~_PAGE_NX
;
492 early_param("noexec", noexec_setup
);
494 static void __init
set_nx(void)
496 unsigned int v
[4], l
, h
;
498 if (cpu_has_pae
&& (cpuid_eax(0x80000000) > 0x80000001)) {
499 cpuid(0x80000001, &v
[0], &v
[1], &v
[2], &v
[3]);
500 if ((v
[3] & (1 << 20)) && !disable_nx
) {
501 rdmsr(MSR_EFER
, l
, h
);
503 wrmsr(MSR_EFER
, l
, h
);
505 __supported_pte_mask
|= _PAGE_NX
;
513 * paging_init() sets up the page tables - note that the first 8MB are
514 * already mapped by head.S.
516 * This routines also unmaps the page at virtual kernel address 0, so
517 * that we can trap those pesky NULL-reference errors in the kernel.
519 void __init
paging_init(void)
521 #ifdef CONFIG_X86_PAE
524 printk("NX (Execute Disable) protection: active\n");
529 load_cr3(swapper_pg_dir
);
531 #ifdef CONFIG_X86_PAE
533 * We will bail out later - printk doesn't work right now so
534 * the user would just see a hanging kernel.
537 set_in_cr4(X86_CR4_PAE
);
545 * Test if the WP bit works in supervisor mode. It isn't supported on 386's
546 * and also on some strange 486's (NexGen etc.). All 586+'s are OK. This
547 * used to involve black magic jumps to work around some nasty CPU bugs,
548 * but fortunately the switch to using exceptions got rid of all that.
551 static void __init
test_wp_bit(void)
553 printk("Checking if this processor honours the WP bit even in supervisor mode... ");
555 /* Any page-aligned address will do, the test is non-destructive */
556 __set_fixmap(FIX_WP_TEST
, __pa(&swapper_pg_dir
), PAGE_READONLY
);
557 boot_cpu_data
.wp_works_ok
= do_test_wp_bit();
558 clear_fixmap(FIX_WP_TEST
);
560 if (!boot_cpu_data
.wp_works_ok
) {
562 #ifdef CONFIG_X86_WP_WORKS_OK
563 panic("This kernel doesn't support CPU's with broken WP. Recompile it for a 386!");
570 static struct kcore_list kcore_mem
, kcore_vmalloc
;
572 void __init
mem_init(void)
574 extern int ppro_with_ram_bug(void);
575 int codesize
, reservedpages
, datasize
, initsize
;
579 #ifdef CONFIG_FLATMEM
583 bad_ppro
= ppro_with_ram_bug();
585 #ifdef CONFIG_HIGHMEM
586 /* check that fixmap and pkmap do not overlap */
587 if (PKMAP_BASE
+LAST_PKMAP
*PAGE_SIZE
>= FIXADDR_START
) {
588 printk(KERN_ERR
"fixmap and kmap areas overlap - this will crash\n");
589 printk(KERN_ERR
"pkstart: %lxh pkend: %lxh fixstart %lxh\n",
590 PKMAP_BASE
, PKMAP_BASE
+LAST_PKMAP
*PAGE_SIZE
, FIXADDR_START
);
595 /* this will put all low memory onto the freelists */
596 totalram_pages
+= free_all_bootmem();
599 for (tmp
= 0; tmp
< max_low_pfn
; tmp
++)
601 * Only count reserved RAM pages
603 if (page_is_ram(tmp
) && PageReserved(pfn_to_page(tmp
)))
606 set_highmem_pages_init(bad_ppro
);
608 codesize
= (unsigned long) &_etext
- (unsigned long) &_text
;
609 datasize
= (unsigned long) &_edata
- (unsigned long) &_etext
;
610 initsize
= (unsigned long) &__init_end
- (unsigned long) &__init_begin
;
612 kclist_add(&kcore_mem
, __va(0), max_low_pfn
<< PAGE_SHIFT
);
613 kclist_add(&kcore_vmalloc
, (void *)VMALLOC_START
,
614 VMALLOC_END
-VMALLOC_START
);
616 printk(KERN_INFO
"Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
617 (unsigned long) nr_free_pages() << (PAGE_SHIFT
-10),
618 num_physpages
<< (PAGE_SHIFT
-10),
620 reservedpages
<< (PAGE_SHIFT
-10),
623 (unsigned long) (totalhigh_pages
<< (PAGE_SHIFT
-10))
626 #if 1 /* double-sanity-check paranoia */
627 printk("virtual kernel memory layout:\n"
628 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
629 #ifdef CONFIG_HIGHMEM
630 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
632 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
633 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
634 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
635 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
636 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
637 FIXADDR_START
, FIXADDR_TOP
,
638 (FIXADDR_TOP
- FIXADDR_START
) >> 10,
640 #ifdef CONFIG_HIGHMEM
641 PKMAP_BASE
, PKMAP_BASE
+LAST_PKMAP
*PAGE_SIZE
,
642 (LAST_PKMAP
*PAGE_SIZE
) >> 10,
645 VMALLOC_START
, VMALLOC_END
,
646 (VMALLOC_END
- VMALLOC_START
) >> 20,
648 (unsigned long)__va(0), (unsigned long)high_memory
,
649 ((unsigned long)high_memory
- (unsigned long)__va(0)) >> 20,
651 (unsigned long)&__init_begin
, (unsigned long)&__init_end
,
652 ((unsigned long)&__init_end
- (unsigned long)&__init_begin
) >> 10,
654 (unsigned long)&_etext
, (unsigned long)&_edata
,
655 ((unsigned long)&_edata
- (unsigned long)&_etext
) >> 10,
657 (unsigned long)&_text
, (unsigned long)&_etext
,
658 ((unsigned long)&_etext
- (unsigned long)&_text
) >> 10);
660 #ifdef CONFIG_HIGHMEM
661 BUG_ON(PKMAP_BASE
+LAST_PKMAP
*PAGE_SIZE
> FIXADDR_START
);
662 BUG_ON(VMALLOC_END
> PKMAP_BASE
);
664 BUG_ON(VMALLOC_START
> VMALLOC_END
);
665 BUG_ON((unsigned long)high_memory
> VMALLOC_START
);
666 #endif /* double-sanity-check paranoia */
668 #ifdef CONFIG_X86_PAE
670 panic("cannot execute a PAE-enabled kernel on a PAE-less CPU!");
672 if (boot_cpu_data
.wp_works_ok
< 0)
676 * Subtle. SMP is doing it's boot stuff late (because it has to
677 * fork idle threads) - but it also needs low mappings for the
678 * protected-mode entry to work. We zap these entries only after
679 * the WP-bit has been tested.
686 #ifdef CONFIG_MEMORY_HOTPLUG
687 int arch_add_memory(int nid
, u64 start
, u64 size
)
689 struct pglist_data
*pgdata
= NODE_DATA(nid
);
690 struct zone
*zone
= pgdata
->node_zones
+ ZONE_HIGHMEM
;
691 unsigned long start_pfn
= start
>> PAGE_SHIFT
;
692 unsigned long nr_pages
= size
>> PAGE_SHIFT
;
694 return __add_pages(zone
, start_pfn
, nr_pages
);
699 struct kmem_cache
*pmd_cache
;
701 void __init
pgtable_cache_init(void)
703 if (PTRS_PER_PMD
> 1)
704 pmd_cache
= kmem_cache_create("pmd",
705 PTRS_PER_PMD
*sizeof(pmd_t
),
706 PTRS_PER_PMD
*sizeof(pmd_t
),
712 * This function cannot be __init, since exceptions don't work in that
713 * section. Put this after the callers, so that it cannot be inlined.
715 static int noinline
do_test_wp_bit(void)
720 __asm__
__volatile__(
725 ".section __ex_table,\"a\"\n"
729 :"=m" (*(char *)fix_to_virt(FIX_WP_TEST
)),
738 #ifdef CONFIG_DEBUG_RODATA
740 void mark_rodata_ro(void)
742 unsigned long start
= PFN_ALIGN(_text
);
743 unsigned long size
= PFN_ALIGN(_etext
) - start
;
745 #ifndef CONFIG_KPROBES
746 #ifdef CONFIG_HOTPLUG_CPU
747 /* It must still be possible to apply SMP alternatives. */
748 if (num_possible_cpus() <= 1)
751 set_pages_ro(virt_to_page(start
), size
>> PAGE_SHIFT
);
752 printk("Write protecting the kernel text: %luk\n", size
>> 10);
754 #ifdef CONFIG_CPA_DEBUG
757 printk("Testing CPA: Reverting %lx-%lx\n", start
, start
+size
);
758 set_pages_rw(virt_to_page(start
), size
>>PAGE_SHIFT
);
761 printk("Testing CPA: write protecting again\n");
762 set_pages_ro(virt_to_page(start
), size
>>PAGE_SHIFT
);
768 size
= (unsigned long)__end_rodata
- start
;
769 set_pages_ro(virt_to_page(start
), size
>> PAGE_SHIFT
);
770 printk("Write protecting the kernel read-only data: %luk\n",
774 * set_pages_*() requires a global_flush_tlb() call after it.
775 * We do this after the printk so that if something went wrong in the
776 * change, the printk gets out at least to give a better debug hint
777 * of who is the culprit.
781 #ifdef CONFIG_CPA_DEBUG
782 printk("Testing CPA: undo %lx-%lx\n", start
, start
+ size
);
783 set_pages_rw(virt_to_page(start
), size
>> PAGE_SHIFT
);
786 printk("Testing CPA: write protecting again\n");
787 set_pages_ro(virt_to_page(start
), size
>> PAGE_SHIFT
);
793 void free_init_pages(char *what
, unsigned long begin
, unsigned long end
)
797 for (addr
= begin
; addr
< end
; addr
+= PAGE_SIZE
) {
798 ClearPageReserved(virt_to_page(addr
));
799 init_page_count(virt_to_page(addr
));
800 memset((void *)addr
, POISON_FREE_INITMEM
, PAGE_SIZE
);
804 printk(KERN_INFO
"Freeing %s: %luk freed\n", what
, (end
- begin
) >> 10);
807 void free_initmem(void)
809 free_init_pages("unused kernel memory",
810 (unsigned long)(&__init_begin
),
811 (unsigned long)(&__init_end
));
814 #ifdef CONFIG_BLK_DEV_INITRD
815 void free_initrd_mem(unsigned long start
, unsigned long end
)
817 free_init_pages("initrd memory", start
, end
);