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   1 /* $Id: pgalloc.h,v 1.30 2001/12/21 04:56:17 davem Exp $ */
   2 #ifndef _SPARC64_PGALLOC_H
   3 #define _SPARC64_PGALLOC_H
   4
   5 #include <linux/config.h>
   6 #include <linux/kernel.h>
   7 #include <linux/sched.h>
   8 #include <linux/mm.h>
   9
  10 #include <asm/spitfire.h>
  11 #include <asm/cpudata.h>
  12 #include <asm/cacheflush.h>
  13 #include <asm/page.h>
  14
  15 /* Page table allocation/freeing. */
  16 #ifdef CONFIG_SMP
  17 /* Sliiiicck */
  18 #define pgt_quicklists  local_cpu_data()
  19 #else
  20 extern struct pgtable_cache_struct {
  21         unsigned long *pgd_cache;
  22         unsigned long *pte_cache[2];
  23         unsigned int pgcache_size;
  24 } pgt_quicklists;
  25 #endif
  26 #define pgd_quicklist           (pgt_quicklists.pgd_cache)
  27 #define pmd_quicklist           ((unsigned long *)0)
  28 #define pte_quicklist           (pgt_quicklists.pte_cache)
  29 #define pgtable_cache_size      (pgt_quicklists.pgcache_size)
  30
  31 static __inline__ void free_pgd_fast(pgd_t *pgd)
  32 {
  33         preempt_disable();
  34         *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
  35         pgd_quicklist = (unsigned long *) pgd;
  36         pgtable_cache_size++;
  37         preempt_enable();
  38 }
  39
  40 static __inline__ pgd_t *get_pgd_fast(void)
  41 {
  42         unsigned long *ret;
  43
  44         preempt_disable();
  45         if((ret = pgd_quicklist) != NULL) {
  46                 pgd_quicklist = (unsigned long *)(*ret);
  47                 ret[0] = 0;
  48                 pgtable_cache_size--;
  49                 preempt_enable();
  50         } else {
  51                 preempt_enable();
  52                 ret = (unsigned long *) __get_free_page(GFP_KERNEL|__GFP_REPEAT);
  53                 if(ret)
  54                         memset(ret, 0, PAGE_SIZE);
  55         }
  56         return (pgd_t *)ret;
  57 }
  58
  59 static __inline__ void free_pgd_slow(pgd_t *pgd)
  60 {
  61         free_page((unsigned long)pgd);
  62 }
  63
  64 #ifdef DCACHE_ALIASING_POSSIBLE
  65 #define VPTE_COLOR(address)             (((address) >> (PAGE_SHIFT + 10)) & 1UL)
  66 #define DCACHE_COLOR(address)           (((address) >> PAGE_SHIFT) & 1UL)
  67 #else
  68 #define VPTE_COLOR(address)             0
  69 #define DCACHE_COLOR(address)           0
  70 #endif
  71
  72 #define pud_populate(MM, PUD, PMD)      pud_set(PUD, PMD)
  73
  74 static __inline__ pmd_t *pmd_alloc_one_fast(struct mm_struct *mm, unsigned long address)
  75 {
  76         unsigned long *ret;
  77         int color = 0;
  78
  79         preempt_disable();
  80         if (pte_quicklist[color] == NULL)
  81                 color = 1;
  82
  83         if((ret = (unsigned long *)pte_quicklist[color]) != NULL) {
  84                 pte_quicklist[color] = (unsigned long *)(*ret);
  85                 ret[0] = 0;
  86                 pgtable_cache_size--;
  87         }
  88         preempt_enable();
  89
  90         return (pmd_t *)ret;
  91 }
  92
  93 static __inline__ pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  94 {
  95         pmd_t *pmd;
  96
  97         pmd = pmd_alloc_one_fast(mm, address);
  98         if (!pmd) {
  99                 pmd = (pmd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
 100                 if (pmd)
 101                         memset(pmd, 0, PAGE_SIZE);
 102         }
 103         return pmd;
 104 }
 105
 106 static __inline__ void free_pmd_fast(pmd_t *pmd)
 107 {
 108         unsigned long color = DCACHE_COLOR((unsigned long)pmd);
 109
 110         preempt_disable();
 111         *(unsigned long *)pmd = (unsigned long) pte_quicklist[color];
 112         pte_quicklist[color] = (unsigned long *) pmd;
 113         pgtable_cache_size++;
 114         preempt_enable();
 115 }
 116
 117 static __inline__ void free_pmd_slow(pmd_t *pmd)
 118 {
 119         free_page((unsigned long)pmd);
 120 }
 121
 122 #define pmd_populate_kernel(MM, PMD, PTE)       pmd_set(PMD, PTE)
 123 #define pmd_populate(MM,PMD,PTE_PAGE)           \
 124         pmd_populate_kernel(MM,PMD,page_address(PTE_PAGE))
 125
 126 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address);
 127
 128 static inline struct page *
 129 pte_alloc_one(struct mm_struct *mm, unsigned long addr)
 130 {
 131         pte_t *pte = pte_alloc_one_kernel(mm, addr);
 132
 133         if (pte)
 134                 return virt_to_page(pte);
 135
 136         return NULL;
 137 }
 138
 139 static __inline__ pte_t *pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
 140 {
 141         unsigned long color = VPTE_COLOR(address);
 142         unsigned long *ret;
 143
 144         preempt_disable();
 145         if((ret = (unsigned long *)pte_quicklist[color]) != NULL) {
 146                 pte_quicklist[color] = (unsigned long *)(*ret);
 147                 ret[0] = 0;
 148                 pgtable_cache_size--;
 149         }
 150         preempt_enable();
 151         return (pte_t *)ret;
 152 }
 153
 154 static __inline__ void free_pte_fast(pte_t *pte)
 155 {
 156         unsigned long color = DCACHE_COLOR((unsigned long)pte);
 157
 158         preempt_disable();
 159         *(unsigned long *)pte = (unsigned long) pte_quicklist[color];
 160         pte_quicklist[color] = (unsigned long *) pte;
 161         pgtable_cache_size++;
 162         preempt_enable();
 163 }
 164
 165 static __inline__ void free_pte_slow(pte_t *pte)
 166 {
 167         free_page((unsigned long)pte);
 168 }
 169
 170 static inline void pte_free_kernel(pte_t *pte)
 171 {
 172         free_pte_fast(pte);
 173 }
 174
 175 static inline void pte_free(struct page *ptepage)
 176 {
 177         free_pte_fast(page_address(ptepage));
 178 }
 179
 180 #define pmd_free(pmd)           free_pmd_fast(pmd)
 181 #define pgd_free(pgd)           free_pgd_fast(pgd)
 182 #define pgd_alloc(mm)           get_pgd_fast()
 183
 184 #endif /* _SPARC64_PGALLOC_H */