2008-02-23 15:58:20 +07:00
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/*
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* linux/arch/i386/kernel/head32.c -- prepare to run common code
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*
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* Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
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* Copyright (C) 2007 Eric Biederman <ebiederm@xmission.com>
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*/
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#include <linux/init.h>
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#include <linux/start_kernel.h>
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x86: Make sure free_init_pages() frees pages on page boundary
When CONFIG_NO_BOOTMEM=y, it could use memory more effiently, or
in a more compact fashion.
Example:
Allocated new RAMDISK: 00ec2000 - 0248ce57
Move RAMDISK from 000000002ea04000 - 000000002ffcee56 to 00ec2000 - 0248ce56
The new RAMDISK's end is not page aligned.
Last page could be shared with other users.
When free_init_pages are called for initrd or .init, the page
could be freed and we could corrupt other data.
code segment in free_init_pages():
| for (; addr < end; addr += PAGE_SIZE) {
| ClearPageReserved(virt_to_page(addr));
| init_page_count(virt_to_page(addr));
| memset((void *)(addr & ~(PAGE_SIZE-1)),
| POISON_FREE_INITMEM, PAGE_SIZE);
| free_page(addr);
| totalram_pages++;
| }
last half page could be used as one whole free page.
So page align the boundaries.
-v2: make the original initramdisk to be aligned, according to
Johannes, otherwise we have the chance to lose one page.
we still need to keep initrd_end not aligned, otherwise it could
confuse decompressor.
-v3: change to WARN_ON instead, suggested by Johannes.
-v4: use PAGE_ALIGN, suggested by Johannes.
We may fix that macro name later to PAGE_ALIGN_UP, and PAGE_ALIGN_DOWN
Add comments about assuming ramdisk start is aligned
in relocate_initrd(), change to re get ramdisk_image instead of save it
to make diff smaller. Add warning for wrong range, suggested by Johannes.
-v6: remove one WARN()
We need to align beginning in free_init_pages()
do not copy more than ramdisk_size, noticed by Johannes
Reported-by: Stanislaw Gruszka <sgruszka@redhat.com>
Tested-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: David Miller <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <1269830604-26214-3-git-send-email-yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-03-29 09:42:55 +07:00
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#include <linux/mm.h>
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2010-08-26 03:39:17 +07:00
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#include <linux/memblock.h>
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2008-02-23 15:58:20 +07:00
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2008-05-18 15:18:57 +07:00
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#include <asm/setup.h>
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#include <asm/sections.h>
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#include <asm/e820.h>
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2009-08-19 19:36:27 +07:00
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#include <asm/page.h>
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2009-08-20 14:27:29 +07:00
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#include <asm/apic.h>
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#include <asm/io_apic.h>
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2009-08-29 20:03:59 +07:00
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#include <asm/bios_ebda.h>
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2010-08-28 20:58:33 +07:00
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#include <asm/tlbflush.h>
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2013-01-29 16:05:24 +07:00
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#include <asm/bootparam_utils.h>
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2009-08-29 20:03:59 +07:00
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static void __init i386_default_early_setup(void)
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{
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2010-06-11 17:17:00 +07:00
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/* Initialize 32bit specific setup functions */
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2009-08-29 20:03:59 +07:00
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x86_init.resources.reserve_resources = i386_reserve_resources;
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x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
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}
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2008-05-18 15:18:57 +07:00
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2014-05-02 05:44:37 +07:00
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asmlinkage __visible void __init i386_start_kernel(void)
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2008-02-23 15:58:20 +07:00
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{
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2014-10-25 05:58:08 +07:00
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cr4_init_shadow();
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2013-01-29 16:05:24 +07:00
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sanitize_boot_params(&boot_params);
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2016-04-14 07:04:34 +07:00
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x86_early_init_platform_quirks();
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2009-08-29 20:03:59 +07:00
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/* Call the subarch specific early setup function */
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switch (boot_params.hdr.hardware_subarch) {
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2013-10-18 05:35:29 +07:00
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case X86_SUBARCH_INTEL_MID:
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x86_intel_mid_early_setup();
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2009-08-29 19:54:20 +07:00
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break;
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2010-11-10 03:08:04 +07:00
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case X86_SUBARCH_CE4100:
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x86_ce4100_early_setup();
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break;
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2009-08-29 20:03:59 +07:00
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default:
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i386_default_early_setup();
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break;
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}
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2008-05-18 15:18:57 +07:00
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2008-02-23 15:58:20 +07:00
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start_kernel();
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}
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2016-12-08 23:44:31 +07:00
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/*
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* Initialize page tables. This creates a PDE and a set of page
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* tables, which are located immediately beyond __brk_base. The variable
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* _brk_end is set up to point to the first "safe" location.
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* Mappings are created both at virtual address 0 (identity mapping)
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* and PAGE_OFFSET for up to _end.
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*
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* In PAE mode initial_page_table is statically defined to contain
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* enough entries to cover the VMSPLIT option (that is the top 1, 2 or 3
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* entries). The identity mapping is handled by pointing two PGD entries
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* to the first kernel PMD. Note the upper half of each PMD or PTE are
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* always zero at this stage.
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*/
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void __init mk_early_pgtbl_32(void)
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{
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#ifdef __pa
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#undef __pa
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#endif
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#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
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pte_t pte, *ptep;
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int i;
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unsigned long *ptr;
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/* Enough space to fit pagetables for the low memory linear map */
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const unsigned long limit = __pa(_end) +
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(PAGE_TABLE_SIZE(LOWMEM_PAGES) << PAGE_SHIFT);
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#ifdef CONFIG_X86_PAE
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pmd_t pl2, *pl2p = (pmd_t *)__pa(initial_pg_pmd);
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#define SET_PL2(pl2, val) { (pl2).pmd = (val); }
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#else
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pgd_t pl2, *pl2p = (pgd_t *)__pa(initial_page_table);
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#define SET_PL2(pl2, val) { (pl2).pgd = (val); }
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#endif
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ptep = (pte_t *)__pa(__brk_base);
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pte.pte = PTE_IDENT_ATTR;
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while ((pte.pte & PTE_PFN_MASK) < limit) {
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SET_PL2(pl2, (unsigned long)ptep | PDE_IDENT_ATTR);
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*pl2p = pl2;
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#ifndef CONFIG_X86_PAE
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/* Kernel PDE entry */
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*(pl2p + ((PAGE_OFFSET >> PGDIR_SHIFT))) = pl2;
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#endif
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for (i = 0; i < PTRS_PER_PTE; i++) {
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*ptep = pte;
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pte.pte += PAGE_SIZE;
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ptep++;
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}
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pl2p++;
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}
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ptr = (unsigned long *)__pa(&max_pfn_mapped);
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/* Can't use pte_pfn() since it's a call with CONFIG_PARAVIRT */
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*ptr = (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT;
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ptr = (unsigned long *)__pa(&_brk_end);
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*ptr = (unsigned long)ptep + PAGE_OFFSET;
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}
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