* Associate a virtual page frame with a given physical page frame
* and protection flags for that frame.
*/
-static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
+void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
{
pgd_t *pgd;
pud_t *pud;
return;
}
pte = pte_offset_kernel(pmd, vaddr);
- if (pgprot_val(flags))
- set_pte_present(&init_mm, vaddr, pte, pfn_pte(pfn, flags));
+ if (pte_val(pteval))
+ set_pte_present(&init_mm, vaddr, pte, pteval);
else
pte_clear(&init_mm, vaddr, pte);
__flush_tlb_one(vaddr);
}
-static int fixmaps;
unsigned long __FIXADDR_TOP = 0xfffff000;
EXPORT_SYMBOL(__FIXADDR_TOP);
-void __set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t flags)
-{
- unsigned long address = __fix_to_virt(idx);
-
- if (idx >= __end_of_fixed_addresses) {
- BUG();
- return;
- }
- set_pte_pfn(address, phys >> PAGE_SHIFT, flags);
- fixmaps++;
-}
-
/**
* reserve_top_address - reserves a hole in the top of kernel address space
* @reserve - size of hole to reserve
* Can be used to relocate the fixmap area and poke a hole in the top
* of kernel address space to make room for a hypervisor.
*/
-void reserve_top_address(unsigned long reserve)
+void __init reserve_top_address(unsigned long reserve)
{
- BUG_ON(fixmaps > 0);
+ BUG_ON(fixmaps_set > 0);
printk(KERN_INFO "Reserving virtual address space above 0x%08x\n",
(int)-reserve);
__FIXADDR_TOP = -reserve - PAGE_SIZE;
__VMALLOC_RESERVE += reserve;
}
-pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
-{
- return (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
-}
-
-pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
-{
- struct page *pte;
-
-#ifdef CONFIG_HIGHPTE
- pte = alloc_pages(GFP_KERNEL|__GFP_HIGHMEM|__GFP_REPEAT|__GFP_ZERO, 0);
-#else
- pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
-#endif
- if (pte)
- pgtable_page_ctor(pte);
- return pte;
-}
-
-/*
- * List of all pgd's needed for non-PAE so it can invalidate entries
- * in both cached and uncached pgd's; not needed for PAE since the
- * kernel pmd is shared. If PAE were not to share the pmd a similar
- * tactic would be needed. This is essentially codepath-based locking
- * against pageattr.c; it is the unique case in which a valid change
- * of kernel pagetables can't be lazily synchronized by vmalloc faults.
- * vmalloc faults work because attached pagetables are never freed.
- * -- wli
- */
-static inline void pgd_list_add(pgd_t *pgd)
-{
- struct page *page = virt_to_page(pgd);
-
- list_add(&page->lru, &pgd_list);
-}
-
-static inline void pgd_list_del(pgd_t *pgd)
-{
- struct page *page = virt_to_page(pgd);
-
- list_del(&page->lru);
-}
-
-#define UNSHARED_PTRS_PER_PGD \
- (SHARED_KERNEL_PMD ? USER_PTRS_PER_PGD : PTRS_PER_PGD)
-
-static void pgd_ctor(void *p)
-{
- pgd_t *pgd = p;
- unsigned long flags;
-
- /* Clear usermode parts of PGD */
- memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t));
-
- spin_lock_irqsave(&pgd_lock, flags);
-
- /* If the pgd points to a shared pagetable level (either the
- ptes in non-PAE, or shared PMD in PAE), then just copy the
- references from swapper_pg_dir. */
- if (PAGETABLE_LEVELS == 2 ||
- (PAGETABLE_LEVELS == 3 && SHARED_KERNEL_PMD)) {
- clone_pgd_range(pgd + USER_PTRS_PER_PGD,
- swapper_pg_dir + USER_PTRS_PER_PGD,
- KERNEL_PGD_PTRS);
- paravirt_alloc_pd_clone(__pa(pgd) >> PAGE_SHIFT,
- __pa(swapper_pg_dir) >> PAGE_SHIFT,
- USER_PTRS_PER_PGD,
- KERNEL_PGD_PTRS);
- }
-
- /* list required to sync kernel mapping updates */
- if (!SHARED_KERNEL_PMD)
- pgd_list_add(pgd);
-
- spin_unlock_irqrestore(&pgd_lock, flags);
-}
-
-static void pgd_dtor(void *pgd)
-{
- unsigned long flags; /* can be called from interrupt context */
-
- if (SHARED_KERNEL_PMD)
- return;
-
- spin_lock_irqsave(&pgd_lock, flags);
- pgd_list_del(pgd);
- spin_unlock_irqrestore(&pgd_lock, flags);
-}
-
-#ifdef CONFIG_X86_PAE
/*
- * Mop up any pmd pages which may still be attached to the pgd.
- * Normally they will be freed by munmap/exit_mmap, but any pmd we
- * preallocate which never got a corresponding vma will need to be
- * freed manually.
+ * vmalloc=size forces the vmalloc area to be exactly 'size'
+ * bytes. This can be used to increase (or decrease) the
+ * vmalloc area - the default is 128m.
*/
-static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)
+static int __init parse_vmalloc(char *arg)
{
- int i;
-
- for(i = 0; i < UNSHARED_PTRS_PER_PGD; i++) {
- pgd_t pgd = pgdp[i];
-
- if (pgd_val(pgd) != 0) {
- pmd_t *pmd = (pmd_t *)pgd_page_vaddr(pgd);
+ if (!arg)
+ return -EINVAL;
- pgdp[i] = native_make_pgd(0);
-
- paravirt_release_pd(pgd_val(pgd) >> PAGE_SHIFT);
- pmd_free(mm, pmd);
- }
- }
+ __VMALLOC_RESERVE = memparse(arg, &arg);
+ return 0;
}
+early_param("vmalloc", parse_vmalloc);
/*
- * In PAE mode, we need to do a cr3 reload (=tlb flush) when
- * updating the top-level pagetable entries to guarantee the
- * processor notices the update. Since this is expensive, and
- * all 4 top-level entries are used almost immediately in a
- * new process's life, we just pre-populate them here.
- *
- * Also, if we're in a paravirt environment where the kernel pmd is
- * not shared between pagetables (!SHARED_KERNEL_PMDS), we allocate
- * and initialize the kernel pmds here.
+ * reservetop=size reserves a hole at the top of the kernel address space which
+ * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
+ * so relocating the fixmap can be done before paging initialization.
*/
-static int pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd)
-{
- pud_t *pud;
- unsigned long addr;
- int i;
-
- pud = pud_offset(pgd, 0);
- for (addr = i = 0; i < UNSHARED_PTRS_PER_PGD;
- i++, pud++, addr += PUD_SIZE) {
- pmd_t *pmd = pmd_alloc_one(mm, addr);
-
- if (!pmd) {
- pgd_mop_up_pmds(mm, pgd);
- return 0;
- }
-
- if (i >= USER_PTRS_PER_PGD)
- memcpy(pmd, (pmd_t *)pgd_page_vaddr(swapper_pg_dir[i]),
- sizeof(pmd_t) * PTRS_PER_PMD);
-
- pud_populate(mm, pud, pmd);
- }
-
- return 1;
-}
-#else /* !CONFIG_X86_PAE */
-/* No need to prepopulate any pagetable entries in non-PAE modes. */
-static int pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd)
-{
- return 1;
-}
-
-static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)
+static int __init parse_reservetop(char *arg)
{
-}
-#endif /* CONFIG_X86_PAE */
-
-pgd_t *pgd_alloc(struct mm_struct *mm)
-{
- pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
-
- /* so that alloc_pd can use it */
- mm->pgd = pgd;
- if (pgd)
- pgd_ctor(pgd);
-
- if (pgd && !pgd_prepopulate_pmd(mm, pgd)) {
- pgd_dtor(pgd);
- free_page((unsigned long)pgd);
- pgd = NULL;
- }
-
- return pgd;
-}
-
-void pgd_free(struct mm_struct *mm, pgd_t *pgd)
-{
- pgd_mop_up_pmds(mm, pgd);
- pgd_dtor(pgd);
- free_page((unsigned long)pgd);
-}
-
-void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
-{
- pgtable_page_dtor(pte);
- paravirt_release_pt(page_to_pfn(pte));
- tlb_remove_page(tlb, pte);
-}
-
-#ifdef CONFIG_X86_PAE
+ unsigned long address;
-void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
-{
- paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT);
- tlb_remove_page(tlb, virt_to_page(pmd));
-}
-
-#endif
-
-int pmd_bad(pmd_t pmd)
-{
- WARN_ON_ONCE(pmd_bad_v1(pmd) != pmd_bad_v2(pmd));
+ if (!arg)
+ return -EINVAL;
- return pmd_bad_v1(pmd);
+ address = memparse(arg, &arg);
+ reserve_top_address(address);
+ return 0;
}
+early_param("reservetop", parse_reservetop);
projects / cascardo / linux.git / blobdiff