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x86: construct 32-bit boot time page tables in native format.

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Specifically the boot time page tables in a CONFIG_X86_PAE=y enabled
kernel are in PAE format.

early_ioremap is updated to use the standard page table accessors.

Clear any mappings beyond max_low_pfn from the boot page tables in
native_pagetable_setup_start because the initial mappings can extend
beyond the range of physical memory and into the vmalloc area.

Derived from patches by Eric Biederman and H. Peter Anvin.

[ jeremy@goop.org: PAE swapper_pg_dir needs to be page-sized fix ]

Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Mika Penttilä <mika.penttila@kolumbus.fi>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ian Campbell
2008-02-09 23:24:09 +01:00
committed by Thomas Gleixner
parent 185c045c24
commit 551889a6e2
6 changed files with 177 additions and 108 deletions
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55
arch/x86/mm/ioremap.c
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@@ -260,41 +260,46 @@ static int __init early_ioremap_debug_setup(char *str)
early_param("early_ioremap_debug", early_ioremap_debug_setup);
static __initdata int after_paging_init;
static __initdata unsigned long bm_pte[1024]
static __initdata pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)]
__attribute__((aligned(PAGE_SIZE)));
static inline unsigned long * __init early_ioremap_pgd(unsigned long addr)
static inline pmd_t * __init early_ioremap_pmd(unsigned long addr)
{
return (unsigned long *)swapper_pg_dir + ((addr >> 22) & 1023);
pgd_t *pgd = &swapper_pg_dir[pgd_index(addr)];
pud_t *pud = pud_offset(pgd, addr);
pmd_t *pmd = pmd_offset(pud, addr);
return pmd;
}
static inline unsigned long * __init early_ioremap_pte(unsigned long addr)
static inline pte_t * __init early_ioremap_pte(unsigned long addr)
{
return bm_pte + ((addr >> PAGE_SHIFT) & 1023);
return &bm_pte[pte_index(addr)];
}
void __init early_ioremap_init(void)
{
unsigned long *pgd;
pmd_t *pmd;
if (early_ioremap_debug)
printk(KERN_INFO "early_ioremap_init()\n");
pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
*pgd = __pa(bm_pte) | _PAGE_TABLE;
pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
memset(bm_pte, 0, sizeof(bm_pte));
set_pmd(pmd, __pmd(__pa(bm_pte) | _PAGE_TABLE));
/*
* The boot-ioremap range spans multiple pgds, for which
* The boot-ioremap range spans multiple pmds, for which
* we are not prepared:
*/
if (pgd != early_ioremap_pgd(fix_to_virt(FIX_BTMAP_END))) {
if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) {
WARN_ON(1);
printk(KERN_WARNING "pgd %p != %p\n",
pgd, early_ioremap_pgd(fix_to_virt(FIX_BTMAP_END)));
printk(KERN_WARNING "pmd %p != %p\n",
pmd, early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END)));
printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
fix_to_virt(FIX_BTMAP_BEGIN));
fix_to_virt(FIX_BTMAP_BEGIN));
printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END): %08lx\n",
fix_to_virt(FIX_BTMAP_END));
fix_to_virt(FIX_BTMAP_END));
printk(KERN_WARNING "FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
printk(KERN_WARNING "FIX_BTMAP_BEGIN: %d\n",
@@ -304,28 +309,29 @@ void __init early_ioremap_init(void)
void __init early_ioremap_clear(void)
{
unsigned long *pgd;
pmd_t *pmd;
if (early_ioremap_debug)
printk(KERN_INFO "early_ioremap_clear()\n");
pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
*pgd = 0;
paravirt_release_pt(__pa(pgd) >> PAGE_SHIFT);
pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
pmd_clear(pmd);
paravirt_release_pt(__pa(pmd) >> PAGE_SHIFT);
__flush_tlb_all();
}
void __init early_ioremap_reset(void)
{
enum fixed_addresses idx;
unsigned long *pte, phys, addr;
unsigned long addr, phys;
pte_t *pte;
after_paging_init = 1;
for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) {
addr = fix_to_virt(idx);
pte = early_ioremap_pte(addr);
if (*pte & _PAGE_PRESENT) {
phys = *pte & PAGE_MASK;
if (pte_present(*pte)) {
phys = pte_val(*pte) & PAGE_MASK;
set_fixmap(idx, phys);
}
}
@@ -334,7 +340,8 @@ void __init early_ioremap_reset(void)
static void __init __early_set_fixmap(enum fixed_addresses idx,
unsigned long phys, pgprot_t flags)
{
unsigned long *pte, addr = __fix_to_virt(idx);
unsigned long addr = __fix_to_virt(idx);
pte_t *pte;
if (idx >= __end_of_fixed_addresses) {
BUG();
@@ -342,9 +349,9 @@ static void __init __early_set_fixmap(enum fixed_addresses idx,
}
pte = early_ioremap_pte(addr);
if (pgprot_val(flags))
*pte = (phys & PAGE_MASK) | pgprot_val(flags);
set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
else
*pte = 0;
pte_clear(NULL, addr, pte);
__flush_tlb_one(addr);
}