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