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[Xen-changelog] Add arch/i386/mm/pgtable.c to sparse tree.



# HG changeset patch
# User cl349@xxxxxxxxxxxxxxxxxxxx
# Node ID bf594e88f0467520b7b646ffe3e862c6ca335bf6
# Parent  55f597e929f341eade781048db9da77a0352820d
Add arch/i386/mm/pgtable.c to sparse tree.

Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>

diff -r 55f597e929f3 -r bf594e88f046 linux-2.6-xen-sparse/arch/i386/mm/pgtable.c
--- /dev/null   Mon Feb 27 10:27:57 2006
+++ b/linux-2.6-xen-sparse/arch/i386/mm/pgtable.c       Mon Feb 27 10:31:30 2006
@@ -0,0 +1,271 @@
+/*
+ *  linux/arch/i386/mm/pgtable.c
+ */
+
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/mm.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 <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;
+       struct page_state ps;
+       unsigned long flags;
+
+       printk(KERN_INFO "Mem-info:\n");
+       show_free_areas();
+       printk(KERN_INFO "Free swap:       %6ldkB\n", 
nr_swap_pages<<(PAGE_SHIFT-10));
+       for_each_pgdat(pgdat) {
+               pgdat_resize_lock(pgdat, &flags);
+               for (i = 0; i < pgdat->node_spanned_pages; ++i) {
+                       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);
+
+       get_page_state(&ps);
+       printk(KERN_INFO "%lu pages dirty\n", ps.nr_dirty);
+       printk(KERN_INFO "%lu pages writeback\n", ps.nr_writeback);
+       printk(KERN_INFO "%lu pages mapped\n", ps.nr_mapped);
+       printk(KERN_INFO "%lu pages slab\n", ps.nr_slab);
+       printk(KERN_INFO "%lu pages pagetables\n", ps.nr_page_table_pages);
+}
+
+/*
+ * 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);
+       /* <pfn,flags> stored as-is, to permit clearing entries */
+       set_pte(pte, pfn_pte(pfn, flags));
+
+       /*
+        * 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);
+}
+
+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);
+}
+
+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);
+}
+
+struct page *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
+       return pte;
+}
+
+void pmd_ctor(void *pmd, kmem_cache_t *cache, unsigned long flags)
+{
+       memset(pmd, 0, PTRS_PER_PMD*sizeof(pmd_t));
+}
+
+/*
+ * 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.
+ * The locking scheme was chosen on the basis of manfred's
+ * recommendations and having no core impact whatsoever.
+ * -- wli
+ */
+DEFINE_SPINLOCK(pgd_lock);
+struct page *pgd_list;
+
+static inline void pgd_list_add(pgd_t *pgd)
+{
+       struct page *page = virt_to_page(pgd);
+       page->index = (unsigned long)pgd_list;
+       if (pgd_list)
+               set_page_private(pgd_list, (unsigned long)&page->index);
+       pgd_list = page;
+       set_page_private(page, (unsigned long)&pgd_list);
+}
+
+static inline void pgd_list_del(pgd_t *pgd)
+{
+       struct page *next, **pprev, *page = virt_to_page(pgd);
+       next = (struct page *)page->index;
+       pprev = (struct page **)page_private(page);
+       *pprev = next;
+       if (next)
+               set_page_private(next, (unsigned long)pprev);
+}
+
+void pgd_ctor(void *pgd, kmem_cache_t *cache, unsigned long unused)
+{
+       unsigned long flags;
+
+       if (PTRS_PER_PMD == 1) {
+               memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t));
+               spin_lock_irqsave(&pgd_lock, flags);
+       }
+
+       clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD,
+                       swapper_pg_dir + USER_PTRS_PER_PGD,
+                       KERNEL_PGD_PTRS);
+       if (PTRS_PER_PMD > 1)
+               return;
+
+       pgd_list_add(pgd);
+       spin_unlock_irqrestore(&pgd_lock, flags);
+}
+
+/* never called when PTRS_PER_PMD > 1 */
+void pgd_dtor(void *pgd, kmem_cache_t *cache, unsigned long unused)
+{
+       unsigned long flags; /* can be called from interrupt context */
+
+       spin_lock_irqsave(&pgd_lock, flags);
+       pgd_list_del(pgd);
+       spin_unlock_irqrestore(&pgd_lock, flags);
+}
+
+pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+       int i;
+       pgd_t *pgd = kmem_cache_alloc(pgd_cache, GFP_KERNEL);
+
+       if (PTRS_PER_PMD == 1 || !pgd)
+               return pgd;
+
+       for (i = 0; i < USER_PTRS_PER_PGD; ++i) {
+               pmd_t *pmd = kmem_cache_alloc(pmd_cache, GFP_KERNEL);
+               if (!pmd)
+                       goto out_oom;
+               set_pgd(&pgd[i], __pgd(1 + __pa(pmd)));
+       }
+       return pgd;
+
+out_oom:
+       for (i--; i >= 0; i--)
+               kmem_cache_free(pmd_cache, (void *)__va(pgd_val(pgd[i])-1));
+       kmem_cache_free(pgd_cache, pgd);
+       return NULL;
+}
+
+void pgd_free(pgd_t *pgd)
+{
+       int i;
+
+       /* in the PAE case user pgd entries are overwritten before usage */
+       if (PTRS_PER_PMD > 1)
+               for (i = 0; i < USER_PTRS_PER_PGD; ++i)
+                       kmem_cache_free(pmd_cache, (void 
*)__va(pgd_val(pgd[i])-1));
+       /* in the non-PAE case, free_pgtables() clears user pgd entries */
+       kmem_cache_free(pgd_cache, pgd);
+}

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