diff options
Diffstat (limited to 'src/include/kernel/ptmgr.H')
| -rw-r--r-- | src/include/kernel/ptmgr.H | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/src/include/kernel/ptmgr.H b/src/include/kernel/ptmgr.H index 918e4211f..b570e0d14 100644 --- a/src/include/kernel/ptmgr.H +++ b/src/include/kernel/ptmgr.H @@ -59,12 +59,12 @@ class PageTableManager { PT_SIZE = (1 << 18), /**< Size of Page Table in bytes */ PTE_SIZE = /**< Size of 1 Page Table Entry in bytes */ - 2*sizeof(uint64_t), + 2*sizeof(uint64_t), PTEG_SIZE = 8, /**< Number of PTEs in a single PTE Group */ PTEG_COUNT = /**< Number of PTEGs in the Page Table */ (PT_SIZE / PTE_SIZE) / PTEG_SIZE, INVALID_PN = /**< Error value for a Page Number return */ - 0xFFFFFFFFFFFFFFFF, + 0xFFFFFFFFFFFFFFFF, }; /** @@ -72,7 +72,7 @@ class PageTableManager */ struct UsageStats_t { union { - struct { + struct { uint64_t C:1; /**< Page has been modified */ uint64_t R:1; /**< Page has been referenced */ uint64_t LRU:2; /**< Current value of LRU */ @@ -299,6 +299,11 @@ class PageTableManager /** * @brief Write a PTE to memory and update caches appropriately * + * @note This function should only be used to change a PTE from valid to + * invalid or from invalid to valid, unless modifying the permissions + * on an existing PTE (without changing addresses). Use in two + * stages otherwise. + * * @param[in] i_pte Local pointer to PTE data * @param[in] i_dest Real Address inside page table to write i_pte data into * @param[in] i_valid true=set Valid bit, false=clear Valid bit @@ -371,11 +376,21 @@ class PageTableManager uint64_t getStatus( PageTableEntry* i_pte ); /** - * @brief Update the LRU statistics for other PTEs in the same PTEG as the target + * @brief Update the LRU statistics for other PTEs in the same PTEG as the + * target + * + * @param[in] i_newPTE Real address of PTE that is being added to the + * Page Table + */ + void updateLRUGroup( const PageTableEntry* i_newPTE ); + + /** + * @brief Update the LRU statistics for a specific PTE. * - * @param[in] i_newPTE Real address of PTE that is being added to the Page Table + * @param[in] i_newPTE Real address of PTE to update. */ - void updateLRU( const PageTableEntry* i_newPTE ); + void updateLRUEntry( PageTableEntry* i_newPTE ); + /** * @brief Invalidate TLB for a PTE @@ -449,7 +464,7 @@ class PageTableManager * * @param[out] o_pte PTE to modify */ - static void setupDefaultPTE( PageTableEntry* o_pte ); + static void setupDefaultPTE( PageTableEntry* o_pte ) ALWAYS_INLINE; /** * @brief Push C/R/LRU bits to the VMM |
