324 lines
6.3 KiB
C
324 lines
6.3 KiB
C
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/kconfig.h>
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#include <sys/kassert.h>
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#include <sys/kdebug.h>
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#include <sys/kmem.h>
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#include <sys/mp.h>
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#include <machine/cpu.h>
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#include <machine/cpuop.h>
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#include <machine/pmap.h>
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AS systemAS;
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AS *currentAS[MAX_CPUS];
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void
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PMap_Init()
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{
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int i, j;
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kprintf("Initializing PMAP ... ");
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// Setup global state
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for (i = 0; i < MAX_CPUS; i++) {
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currentAS[i] = 0;
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}
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// Allocate system page table
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systemAS.root = PAlloc_AllocPage();
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systemAS.tables = PAGETABLE_ENTRIES / 2 + 1;
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systemAS.mappings = 0;
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if (!systemAS.root)
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PANIC("Cannot allocate system page table");
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// Setup system mappings
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PMap_SystemLMap(0x0, MEM_DIRECTMAP_BASE + 0x0,
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3*512, 0); // 3GB RWX
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PMap_SystemLMap(0xC0000000, MEM_DIRECTMAP_BASE + 0xC0000000,
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512, 0); // 1GB RW + PCD
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PMap_SystemLMap(0x100000000, MEM_DIRECTMAP_BASE + 0x100000000,
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60*512, 0); // 60GB RWX
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PMap_LoadAS(&systemAS);
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kprintf("Done!\n");
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}
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void
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PMap_InitAP()
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{
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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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int i;
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AS *as = PAlloc_AllocPage();
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if (!as)
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return NULL;
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as->root = PAlloc_AllocPage();
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as->tables = 1;
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as->mappings = 0;
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// NOT IMPLEMENTED
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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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}
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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[CPU()];
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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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// Flush TLB
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currentAS[CPU()] = 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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NOT_IMPLEMENTED();
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return NULL;
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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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NOT_IMPLEMENTED();
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return 0;
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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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NOT_IMPLEMENTED();
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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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NOT_IMPLEMENTED();
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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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NOT_IMPLEMENTED();
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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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NOT_IMPLEMENTED();
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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 (64MB) 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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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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NOT_IMPLEMENTED();
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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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NOT_IMPLEMENTED();
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return false;
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}
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// static uint64_t
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// AddrFromIJKL(uint64_t i, uint64_t j, uint64_t k, uint64_t l)
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// {
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// return (i << 39) | (j << HUGE_PGSHIFT) | (k << LARGE_PGSHIFT) | (l << PGSHIFT);
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// }
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void
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PMap_Dump(AS *space)
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{
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return;
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}
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static void
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Debug_PMapDump(int argc, const char *argv[])
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{
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PMap_Dump(currentAS[CPU()]);
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}
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REGISTER_DBGCMD(pmapdump, "Dump memory mappings", Debug_PMapDump);
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