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Diffstat (limited to 'arch/x86/mm/init_32.c')
-rw-r--r--arch/x86/mm/init_32.c68
1 files changed, 25 insertions, 43 deletions
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 030bfed10a6c..f34d275ee201 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -56,8 +56,6 @@
unsigned long highstart_pfn, highend_pfn;
-static noinline int do_test_wp_bit(void);
-
bool __read_mostly __vmalloc_start_set = false;
/*
@@ -67,6 +65,7 @@ bool __read_mostly __vmalloc_start_set = false;
*/
static pmd_t * __init one_md_table_init(pgd_t *pgd)
{
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd_table;
@@ -75,13 +74,15 @@ static pmd_t * __init one_md_table_init(pgd_t *pgd)
pmd_table = (pmd_t *)alloc_low_page();
paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
- pud = pud_offset(pgd, 0);
+ p4d = p4d_offset(pgd, 0);
+ pud = pud_offset(p4d, 0);
BUG_ON(pmd_table != pmd_offset(pud, 0));
return pmd_table;
}
#endif
- pud = pud_offset(pgd, 0);
+ p4d = p4d_offset(pgd, 0);
+ pud = pud_offset(p4d, 0);
pmd_table = pmd_offset(pud, 0);
return pmd_table;
@@ -390,8 +391,11 @@ pte_t *kmap_pte;
static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr)
{
- return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
- vaddr), vaddr), vaddr);
+ pgd_t *pgd = pgd_offset_k(vaddr);
+ p4d_t *p4d = p4d_offset(pgd, vaddr);
+ pud_t *pud = pud_offset(p4d, vaddr);
+ pmd_t *pmd = pmd_offset(pud, vaddr);
+ return pte_offset_kernel(pmd, vaddr);
}
static void __init kmap_init(void)
@@ -410,6 +414,7 @@ static void __init permanent_kmaps_init(pgd_t *pgd_base)
{
unsigned long vaddr;
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -418,7 +423,8 @@ static void __init permanent_kmaps_init(pgd_t *pgd_base)
page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
pgd = swapper_pg_dir + pgd_index(vaddr);
- pud = pud_offset(pgd, vaddr);
+ p4d = p4d_offset(pgd, vaddr);
+ pud = pud_offset(p4d, vaddr);
pmd = pmd_offset(pud, vaddr);
pte = pte_offset_kernel(pmd, vaddr);
pkmap_page_table = pte;
@@ -450,6 +456,7 @@ void __init native_pagetable_init(void)
{
unsigned long pfn, va;
pgd_t *pgd, *base = swapper_pg_dir;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -469,7 +476,8 @@ void __init native_pagetable_init(void)
if (!pgd_present(*pgd))
break;
- pud = pud_offset(pgd, va);
+ p4d = p4d_offset(pgd, va);
+ pud = pud_offset(p4d, va);
pmd = pmd_offset(pud, va);
if (!pmd_present(*pmd))
break;
@@ -716,22 +724,20 @@ void __init paging_init(void)
*/
static void __init test_wp_bit(void)
{
- int wp_works_ok;
+ char z = 0;
- printk(KERN_INFO
- "Checking if this processor honours the WP bit even in supervisor mode...");
+ printk(KERN_INFO "Checking if this processor honours the WP bit even in supervisor mode...");
- /* Any page-aligned address will do, the test is non-destructive */
- __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_KERNEL_RO);
- wp_works_ok = do_test_wp_bit();
- clear_fixmap(FIX_WP_TEST);
+ __set_fixmap(FIX_WP_TEST, __pa_symbol(empty_zero_page), PAGE_KERNEL_RO);
- if (!wp_works_ok) {
- printk(KERN_CONT "No.\n");
- panic("Linux doesn't support CPUs with broken WP.");
- } else {
+ if (probe_kernel_write((char *)fix_to_virt(FIX_WP_TEST), &z, 1)) {
+ clear_fixmap(FIX_WP_TEST);
printk(KERN_CONT "Ok.\n");
+ return;
}
+
+ printk(KERN_CONT "No.\n");
+ panic("Linux doesn't support CPUs with broken WP.");
}
void __init mem_init(void)
@@ -841,30 +847,6 @@ int arch_remove_memory(u64 start, u64 size)
#endif
#endif
-/*
- * This function cannot be __init, since exceptions don't work in that
- * section. Put this after the callers, so that it cannot be inlined.
- */
-static noinline int do_test_wp_bit(void)
-{
- char tmp_reg;
- int flag;
-
- __asm__ __volatile__(
- " movb %0, %1 \n"
- "1: movb %1, %0 \n"
- " xorl %2, %2 \n"
- "2: \n"
- _ASM_EXTABLE(1b,2b)
- :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)),
- "=q" (tmp_reg),
- "=r" (flag)
- :"2" (1)
- :"memory");
-
- return flag;
-}
-
int kernel_set_to_readonly __read_mostly;
void set_kernel_text_rw(void)