/*
+ * Copyright (c) 2014 Advanced Micro Devices, Inc.
* Copyright (c) 2003 The Regents of The University of Michigan
* All rights reserved.
*
/**
* @file
- * Declaration of a non-full system Page Table.
+ * Declarations of a non-full system Page Table.
*/
#ifndef __MEM_PAGE_TABLE_HH__
#include "config/the_isa.hh"
#include "mem/request.hh"
#include "sim/serialize.hh"
+#include "sim/system.hh"
+
+class ThreadContext;
/**
- * Page Table Declaration.
+ * Declaration of base class for page table
*/
-class PageTable
+class PageTableBase : public Serializable
{
protected:
- typedef m5::hash_map<Addr, TheISA::TlbEntry> PTable;
- typedef PTable::iterator PTableItr;
- PTable pTable;
-
struct cacheElement {
+ bool valid;
Addr vaddr;
TheISA::TlbEntry entry;
};
public:
- PageTable(const std::string &__name, uint64_t _pid,
- Addr _pageSize = TheISA::VMPageSize);
+ PageTableBase(const std::string &__name, uint64_t _pid,
+ Addr _pageSize = TheISA::PageBytes)
+ : pageSize(_pageSize), offsetMask(mask(floorLog2(_pageSize))),
+ pid(_pid), _name(__name)
+ {
+ assert(isPowerOf2(pageSize));
+ pTableCache[0].valid = false;
+ pTableCache[1].valid = false;
+ pTableCache[2].valid = false;
+ }
- ~PageTable();
+ virtual ~PageTableBase() {};
+
+ /* generic page table mapping flags
+ * unset | set
+ * bit 0 - no-clobber | clobber
+ * bit 1 - present | not-present
+ * bit 2 - cacheable | uncacheable
+ * bit 3 - read-write | read-only
+ */
+ enum MappingFlags : uint32_t {
+ Clobber = 1,
+ NotPresent = 2,
+ Uncacheable = 4,
+ ReadOnly = 8,
+ };
+
+ virtual void initState(ThreadContext* tc) = 0;
// for DPRINTF compatibility
const std::string name() const { return _name; }
Addr pageAlign(Addr a) { return (a & ~offsetMask); }
Addr pageOffset(Addr a) { return (a & offsetMask); }
- void map(Addr vaddr, Addr paddr, int64_t size, bool clobber = false);
- void remap(Addr vaddr, int64_t size, Addr new_vaddr);
- void unmap(Addr vaddr, int64_t size);
+ /**
+ * Maps a virtual memory region to a physical memory region.
+ * @param vaddr The starting virtual address of the region.
+ * @param paddr The starting physical address where the region is mapped.
+ * @param size The length of the region.
+ * @param flags Generic mapping flags that can be set by or-ing values
+ * from MappingFlags enum.
+ */
+ virtual void map(Addr vaddr, Addr paddr, int64_t size,
+ uint64_t flags = 0) = 0;
+ virtual void remap(Addr vaddr, int64_t size, Addr new_vaddr) = 0;
+ virtual void unmap(Addr vaddr, int64_t size) = 0;
/**
* Check if any pages in a region are already allocated
* @param size The length of the region.
* @return True if no pages in the region are mapped.
*/
- bool isUnmapped(Addr vaddr, int64_t size);
+ virtual bool isUnmapped(Addr vaddr, int64_t size) = 0;
/**
* Lookup function
* @param vaddr The virtual address.
* @return entry The page table entry corresponding to vaddr.
*/
- bool lookup(Addr vaddr, TheISA::TlbEntry &entry);
+ virtual bool lookup(Addr vaddr, TheISA::TlbEntry &entry) = 0;
/**
* Translate function
{
pTableCache[2].entry = pTableCache[1].entry;
pTableCache[2].vaddr = pTableCache[1].vaddr;
+ pTableCache[2].valid = pTableCache[1].valid;
+
pTableCache[1].entry = pTableCache[0].entry;
pTableCache[1].vaddr = pTableCache[0].vaddr;
+ pTableCache[1].valid = pTableCache[0].valid;
+
pTableCache[0].entry = entry;
pTableCache[0].vaddr = vaddr;
+ pTableCache[0].valid = true;
+ }
+
+ /**
+ * Erase an entry from the page table cache.
+ * @param vaddr virtual address (page aligned) to check
+ */
+ inline void eraseCacheEntry(Addr vaddr)
+ {
+ // Invalidate cached entries if necessary
+ if (pTableCache[0].valid && pTableCache[0].vaddr == vaddr) {
+ pTableCache[0].valid = false;
+ } else if (pTableCache[1].valid && pTableCache[1].vaddr == vaddr) {
+ pTableCache[1].valid = false;
+ } else if (pTableCache[2].valid && pTableCache[2].vaddr == vaddr) {
+ pTableCache[2].valid = false;
+ }
+ }
+};
+
+/**
+ * Declaration of functional page table.
+ */
+class FuncPageTable : public PageTableBase
+{
+ private:
+ typedef m5::hash_map<Addr, TheISA::TlbEntry> PTable;
+ typedef PTable::iterator PTableItr;
+ PTable pTable;
+
+ public:
+
+ FuncPageTable(const std::string &__name, uint64_t _pid,
+ Addr _pageSize = TheISA::PageBytes);
+
+ ~FuncPageTable();
+
+ void initState(ThreadContext* tc)
+ {
}
+ void map(Addr vaddr, Addr paddr, int64_t size,
+ uint64_t flags = 0);
+ void remap(Addr vaddr, int64_t size, Addr new_vaddr);
+ void unmap(Addr vaddr, int64_t size);
- void serialize(std::ostream &os);
+ /**
+ * Check if any pages in a region are already allocated
+ * @param vaddr The starting virtual address of the region.
+ * @param size The length of the region.
+ * @return True if no pages in the region are mapped.
+ */
+ bool isUnmapped(Addr vaddr, int64_t size);
+
+ /**
+ * Lookup function
+ * @param vaddr The virtual address.
+ * @return entry The page table entry corresponding to vaddr.
+ */
+ bool lookup(Addr vaddr, TheISA::TlbEntry &entry);
- void unserialize(Checkpoint *cp, const std::string §ion);
+ void serialize(CheckpointOut &cp) const M5_ATTR_OVERRIDE;
+ void unserialize(CheckpointIn &cp) M5_ATTR_OVERRIDE;
+};
+
+/**
+ * Faux page table class indended to stop the usage of
+ * an architectural page table, when there is none defined
+ * for a particular ISA.
+ */
+class NoArchPageTable : public FuncPageTable
+{
+ public:
+ NoArchPageTable(const std::string &__name, uint64_t _pid, System *_sys,
+ Addr _pageSize = TheISA::PageBytes) : FuncPageTable(__name, _pid)
+ {
+ fatal("No architectural page table defined for this ISA.\n");
+ }
};
#endif // __MEM_PAGE_TABLE_HH__