| #include <linux/sched.h> |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/mm.h> |
| #include <linux/nmi.h> |
| #include <linux/swap.h> |
| #include <linux/smp.h> |
| #include <linux/highmem.h> |
| #include <linux/slab.h> |
| #include <linux/pagemap.h> |
| #include <linux/spinlock.h> |
| #include <linux/module.h> |
| #include <linux/quicklist.h> |
| |
| #include <asm/system.h> |
| #include <asm/pgtable.h> |
| #include <asm/pgalloc.h> |
| #include <asm/fixmap.h> |
| #include <asm/e820.h> |
| #include <asm/tlb.h> |
| #include <asm/tlbflush.h> |
| |
| void show_mem(void) |
| { |
| int total = 0, reserved = 0; |
| int shared = 0, cached = 0; |
| int highmem = 0; |
| struct page *page; |
| pg_data_t *pgdat; |
| unsigned long i; |
| unsigned long flags; |
| |
| printk(KERN_INFO "Mem-info:\n"); |
| show_free_areas(); |
| for_each_online_pgdat(pgdat) { |
| pgdat_resize_lock(pgdat, &flags); |
| for (i = 0; i < pgdat->node_spanned_pages; ++i) { |
| if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) |
| touch_nmi_watchdog(); |
| page = pgdat_page_nr(pgdat, i); |
| total++; |
| if (PageHighMem(page)) |
| highmem++; |
| if (PageReserved(page)) |
| reserved++; |
| else if (PageSwapCache(page)) |
| cached++; |
| else if (page_count(page)) |
| shared += page_count(page) - 1; |
| } |
| pgdat_resize_unlock(pgdat, &flags); |
| } |
| printk(KERN_INFO "%d pages of RAM\n", total); |
| printk(KERN_INFO "%d pages of HIGHMEM\n", highmem); |
| printk(KERN_INFO "%d reserved pages\n", reserved); |
| printk(KERN_INFO "%d pages shared\n", shared); |
| printk(KERN_INFO "%d pages swap cached\n", cached); |
| |
| printk(KERN_INFO "%lu pages dirty\n", global_page_state(NR_FILE_DIRTY)); |
| printk(KERN_INFO "%lu pages writeback\n", |
| global_page_state(NR_WRITEBACK)); |
| printk(KERN_INFO "%lu pages mapped\n", global_page_state(NR_FILE_MAPPED)); |
| printk(KERN_INFO "%lu pages slab\n", |
| global_page_state(NR_SLAB_RECLAIMABLE) + |
| global_page_state(NR_SLAB_UNRECLAIMABLE)); |
| printk(KERN_INFO "%lu pages pagetables\n", |
| global_page_state(NR_PAGETABLE)); |
| } |
| |
| /* |
| * 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) |
| { |
| pgd_t *pgd; |
| pud_t *pud; |
| pmd_t *pmd; |
| pte_t *pte; |
| |
| pgd = swapper_pg_dir + pgd_index(vaddr); |
| if (pgd_none(*pgd)) { |
| BUG(); |
| return; |
| } |
| pud = pud_offset(pgd, vaddr); |
| if (pud_none(*pud)) { |
| BUG(); |
| return; |
| } |
| pmd = pmd_offset(pud, vaddr); |
| if (pmd_none(*pmd)) { |
| BUG(); |
| return; |
| } |
| pte = pte_offset_kernel(pmd, vaddr); |
| if (pgprot_val(flags)) |
| set_pte_present(&init_mm, vaddr, pte, pfn_pte(pfn, flags)); |
| else |
| pte_clear(&init_mm, vaddr, pte); |
| |
| /* |
| * It's enough to flush this one mapping. |
| * (PGE mappings get flushed as well) |
| */ |
| __flush_tlb_one(vaddr); |
| } |
| |
| /* |
| * Associate a large virtual page frame with a given physical page frame |
| * and protection flags for that frame. pfn is for the base of the page, |
| * vaddr is what the page gets mapped to - both must be properly aligned. |
| * The pmd must already be instantiated. Assumes PAE mode. |
| */ |
| void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags) |
| { |
| pgd_t *pgd; |
| pud_t *pud; |
| pmd_t *pmd; |
| |
| if (vaddr & (PMD_SIZE-1)) { /* vaddr is misaligned */ |
| printk(KERN_WARNING "set_pmd_pfn: vaddr misaligned\n"); |
| return; /* BUG(); */ |
| } |
| if (pfn & (PTRS_PER_PTE-1)) { /* pfn is misaligned */ |
| printk(KERN_WARNING "set_pmd_pfn: pfn misaligned\n"); |
| return; /* BUG(); */ |
| } |
| pgd = swapper_pg_dir + pgd_index(vaddr); |
| if (pgd_none(*pgd)) { |
| printk(KERN_WARNING "set_pmd_pfn: pgd_none\n"); |
| return; /* BUG(); */ |
| } |
| pud = pud_offset(pgd, vaddr); |
| pmd = pmd_offset(pud, vaddr); |
| set_pmd(pmd, pfn_pmd(pfn, flags)); |
| /* |
| * It's enough to flush this one mapping. |
| * (PGE mappings get flushed as well) |
| */ |
| __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) |
| { |
| BUG_ON(fixmaps > 0); |
| printk(KERN_INFO "Reserving virtual address space above 0x%08x\n", |
| (int)-reserve); |
| __FIXADDR_TOP = -reserve - PAGE_SIZE; |
| __VMALLOC_RESERVE += reserve; |
| } |
| |
| #ifdef CONFIG_X86_PAE |
| |
| 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)); |
| |
| return pmd_bad_v1(pmd); |
| } |