arch/sparc/include/asm/mmu_64.h

   1 #ifndef __MMU_H
   2 #define __MMU_H
   3
   4 #include <linux/const.h>
   5 #include <asm/page.h>
   6 #include <asm/hypervisor.h>
   7
   8 #define CTX_NR_BITS             13
   9
  10 #define TAG_CONTEXT_BITS        ((_AC(1,UL) << CTX_NR_BITS) - _AC(1,UL))
  11
  12 /* UltraSPARC-III+ and later have a feature whereby you can
  13  * select what page size the various Data-TLB instances in the
  14  * chip.  In order to gracefully support this, we put the version
  15  * field in a spot outside of the areas of the context register
  16  * where this parameter is specified.
  17  */
  18 #define CTX_VERSION_SHIFT       22
  19 #define CTX_VERSION_MASK        ((~0UL) << CTX_VERSION_SHIFT)
  20
  21 #define CTX_PGSZ_8KB            _AC(0x0,UL)
  22 #define CTX_PGSZ_64KB           _AC(0x1,UL)
  23 #define CTX_PGSZ_512KB          _AC(0x2,UL)
  24 #define CTX_PGSZ_4MB            _AC(0x3,UL)
  25 #define CTX_PGSZ_BITS           _AC(0x7,UL)
  26 #define CTX_PGSZ0_NUC_SHIFT     61
  27 #define CTX_PGSZ1_NUC_SHIFT     58
  28 #define CTX_PGSZ0_SHIFT         16
  29 #define CTX_PGSZ1_SHIFT         19
  30 #define CTX_PGSZ_MASK           ((CTX_PGSZ_BITS << CTX_PGSZ0_SHIFT) | \
  31                                  (CTX_PGSZ_BITS << CTX_PGSZ1_SHIFT))
  32
  33 #define CTX_PGSZ_BASE   CTX_PGSZ_8KB
  34 #define CTX_PGSZ_HUGE   CTX_PGSZ_4MB
  35 #define CTX_PGSZ_KERN   CTX_PGSZ_4MB
  36
  37 /* Thus, when running on UltraSPARC-III+ and later, we use the following
  38  * PRIMARY_CONTEXT register values for the kernel context.
  39  */
  40 #define CTX_CHEETAH_PLUS_NUC \
  41         ((CTX_PGSZ_KERN << CTX_PGSZ0_NUC_SHIFT) | \
  42          (CTX_PGSZ_BASE << CTX_PGSZ1_NUC_SHIFT))
  43
  44 #define CTX_CHEETAH_PLUS_CTX0 \
  45         ((CTX_PGSZ_KERN << CTX_PGSZ0_SHIFT) | \
  46          (CTX_PGSZ_BASE << CTX_PGSZ1_SHIFT))
  47
  48 /* If you want "the TLB context number" use CTX_NR_MASK.  If you
  49  * want "the bits I program into the context registers" use
  50  * CTX_HW_MASK.
  51  */
  52 #define CTX_NR_MASK             TAG_CONTEXT_BITS
  53 #define CTX_HW_MASK             (CTX_NR_MASK | CTX_PGSZ_MASK)
  54
  55 #define CTX_FIRST_VERSION       BIT(CTX_VERSION_SHIFT)
  56 #define CTX_VALID(__ctx)        \
  57          (!(((__ctx.sparc64_ctx_val) ^ tlb_context_cache) & CTX_VERSION_MASK))
  58 #define CTX_HWBITS(__ctx)       ((__ctx.sparc64_ctx_val) & CTX_HW_MASK)
  59 #define CTX_NRBITS(__ctx)       ((__ctx.sparc64_ctx_val) & CTX_NR_MASK)
  60
  61 #ifndef __ASSEMBLY__
  62
  63 #define TSB_ENTRY_ALIGNMENT     16
  64
  65 struct tsb {
  66         unsigned long tag;
  67         unsigned long pte;
  68 } __attribute__((aligned(TSB_ENTRY_ALIGNMENT)));
  69
  70 void __tsb_insert(unsigned long ent, unsigned long tag, unsigned long pte);
  71 void tsb_flush(unsigned long ent, unsigned long tag);
  72 void tsb_init(struct tsb *tsb, unsigned long size);
  73
  74 struct tsb_config {
  75         struct tsb              *tsb;
  76         unsigned long           tsb_rss_limit;
  77         unsigned long           tsb_nentries;
  78         unsigned long           tsb_reg_val;
  79         unsigned long           tsb_map_vaddr;
  80         unsigned long           tsb_map_pte;
  81 };
  82
  83 #define MM_TSB_BASE     0
  84
  85 #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
  86 #define MM_TSB_HUGE     1
  87 #define MM_NUM_TSBS     2
  88 #else
  89 #define MM_NUM_TSBS     1
  90 #endif
  91
  92 typedef struct {
  93         spinlock_t              lock;
  94         unsigned long           sparc64_ctx_val;
  95         unsigned long           hugetlb_pte_count;
  96         unsigned long           thp_pte_count;
  97         struct tsb_config       tsb_block[MM_NUM_TSBS];
  98         struct hv_tsb_descr     tsb_descr[MM_NUM_TSBS];
  99 } mm_context_t;
 100
 101 #endif /* !__ASSEMBLY__ */
 102
 103 #define TSB_CONFIG_TSB          0x00
 104 #define TSB_CONFIG_RSS_LIMIT    0x08
 105 #define TSB_CONFIG_NENTRIES     0x10
 106 #define TSB_CONFIG_REG_VAL      0x18
 107 #define TSB_CONFIG_MAP_VADDR    0x20
 108 #define TSB_CONFIG_MAP_PTE      0x28
 109
 110 #endif /* __MMU_H */