pmap
This commit is contained in:
Ali Mashtizadeh
parent
631603cab3
commit
ddab13b829
140
sys/amd64/pmap.c
140
sys/amd64/pmap.c
@ -69,6 +69,13 @@ PMap_InitAP()
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PMap_LoadAS(&systemAS);
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}
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/**
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* PMap_NewAS --
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*
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* Create a new address space.
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*
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* @return Newly created address space.
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*/
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AS*
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PMap_NewAS()
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{
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@ -98,6 +105,13 @@ PMap_NewAS()
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return as;
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}
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/**
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* PMap_DestroyAS --
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*
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* Destroys an address space and releases the physical pages.
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*
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* @param [in] space Address space to destroy.
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*/
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void
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PMap_DestroyAS(AS *space)
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{
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@ -143,12 +157,27 @@ PMap_DestroyAS(AS *space)
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PAlloc_Release(space);
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}
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/**
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* PMap_CurrentAS --
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*
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* Get the current address space on this CPU.
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*
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* @return Current address space.
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*/
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AS *
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PMap_CurrentAS()
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{
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return currentAS[THISCPU()];
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}
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/**
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* PMap_LoadAS --
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*
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* Load an address space into the CPU. Reloads the CR3 register in x86-64 that
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* points the physical page tables and flushes the TLB entries.
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*
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* @param [in] space Address space to load.
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*/
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void
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PMap_LoadAS(AS *space)
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{
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@ -156,6 +185,13 @@ PMap_LoadAS(AS *space)
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currentAS[THISCPU()] = space;
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}
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/**
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* PMapAllocPageTable --
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*
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* Allocates and initializes a page table.
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*
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* @return Newly created PageTable.
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*/
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static PageTable *
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PMapAllocPageTable()
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{
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@ -172,6 +208,14 @@ PMapAllocPageTable()
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return pgtbl;
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}
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/**
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* PMap_Translate --
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*
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* Translates a virtual address to physical address for a given address space.
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*
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* @param [in] space Address space we wish to lookup a mapping in.
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* @param [in] va Virtual address we wish to translate.
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*/
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uintptr_t
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PMap_Translate(AS *space, uintptr_t va)
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{
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@ -218,6 +262,18 @@ PMap_Translate(AS *space, uintptr_t va)
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return (*entry & ~(PGMASK | PTE_NX)) + (va & PGMASK);
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}
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/**
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* PMapLookupEntry --
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*
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* Lookup a virtual address in a page table and return a pointer to the page
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* entry. This function allocates page tables as necessary to fill in the
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* 4-level heirarchy.
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*
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* @param [in] space Address space to search.
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* @param [in] va Virtual address to lookup.
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* @param [out] entry Pointer will point to the PageEntry.
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* @param [in] size Page size we want to use.
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*/
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static void
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PMapLookupEntry(AS *space, uint64_t va, PageEntry **entry, int size)
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{
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@ -281,6 +337,20 @@ PMapLookupEntry(AS *space, uint64_t va, PageEntry **entry, int size)
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return;
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}
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/**
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* PMap_Map --
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*
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* Map a physical to virtual mapping in an address space.
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*
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* @param [in] as Address space.
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* @param [in] phys Physical address.
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* @param [in] virt Virtual address.
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* @param [in] pages Pages to map in.
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* @param [in] flags Flags to apply to the mapping.
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*
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* @retval true On success
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* @retval false On failure
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*/
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bool
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PMap_Map(AS *as, uint64_t phys, uint64_t virt, uint64_t pages, uint64_t flags)
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{
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@ -301,6 +371,18 @@ PMap_Map(AS *as, uint64_t phys, uint64_t virt, uint64_t pages, uint64_t flags)
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return true;
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}
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/**
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* PMap_Unmap --
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*
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* Unmap a range of addresses.
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*
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* @param [in] as Address space.
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* @param [in] va Virtual address.
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* @param [in] pages Pages to map in.
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*
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* @retval true On success
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* @retval false On failure
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*/
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bool
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PMap_Unmap(AS *as, uint64_t va, uint64_t pages)
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{
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@ -323,6 +405,20 @@ PMap_Unmap(AS *as, uint64_t va, uint64_t pages)
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return true;
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}
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/**
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* PMap_AllocMap --
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*
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* Map a virtual mapping in an address space and back it by newly allocated
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* memory.
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*
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* @param [in] as Address space.
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* @param [in] virt Virtual address.
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* @param [in] pages Pages to map in.
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* @param [in] flags Flags to apply to the mapping.
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*
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* @retval true On success
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* @retval false On failure
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*/
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bool
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PMap_AllocMap(AS *as, uint64_t virt, uint64_t len, uint64_t flags)
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{
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@ -349,12 +445,37 @@ PMap_AllocMap(AS *as, uint64_t virt, uint64_t len, uint64_t flags)
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return true;
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}
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/**
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* PMap_SystemLookup --
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*
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* Lookup a kernel virtual address in a page table and return a pointer to the
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* page entry. This function allocates page tables as necessary to fill in the
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* 4-level heirarchy.
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*
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* @param [in] va Virtual address to lookup.
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* @param [out] entry Pointer will point to the PageEntry.
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* @param [in] size Page size we want to use.
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*/
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void
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PMap_SystemLookup(uint64_t va, PageEntry **entry, int size)
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{
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PMapLookupEntry(&systemAS, va, entry, size);
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}
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/**
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* PMap_SystemLMap --
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*
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* Map a range of large (2MB) physical pages to virtual pages in the kernel
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* address space that is shared by all processes.
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*
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* @param [in] phys Physical address.
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* @param [in] virt Virtual address.
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* @param [in] lpages Large pages to map in.
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* @param [in] flags Flags to apply to the mapping.
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*
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* @retval true On success
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* @retval false On failure
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*/
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bool
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PMap_SystemLMap(uint64_t phys, uint64_t virt, uint64_t lpages, uint64_t flags)
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{
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@ -375,6 +496,20 @@ PMap_SystemLMap(uint64_t phys, uint64_t virt, uint64_t lpages, uint64_t flags)
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return true;
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}
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/**
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* PMap_SystemLMap --
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*
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* Map a range of physical pages to virtual pages in the kernel address space
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* that is shared by all processes.
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*
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* @param [in] phys Physical address.
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* @param [in] virt Virtual address.
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* @param [in] pages Pages to map in.
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* @param [in] flags Flags to apply to the mapping.
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*
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* @retval true On success
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* @retval false On failure
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*/
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bool
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PMap_SystemMap(uint64_t phys, uint64_t virt, uint64_t pages, uint64_t flags)
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{
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@ -395,6 +530,11 @@ PMap_SystemMap(uint64_t phys, uint64_t virt, uint64_t pages, uint64_t flags)
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return true;
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}
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/**
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* PMap_SystemUnmap --
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*
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* We do not currently use this!
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*/
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bool
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PMap_SystemUnmap(uint64_t virt, uint64_t pages)
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{
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