From 4d5f2c28a88f83d390e80407f55a8a02ead33878 Mon Sep 17 00:00:00 2001 From: Steve Reinhardt Date: Sat, 22 Oct 2011 22:30:07 -0700 Subject: syscall_emul: implement MAP_FIXED option to mmap() --- src/mem/page_table.cc | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) (limited to 'src/mem/page_table.cc') diff --git a/src/mem/page_table.cc b/src/mem/page_table.cc index a94d92480..745872319 100644 --- a/src/mem/page_table.cc +++ b/src/mem/page_table.cc @@ -67,7 +67,7 @@ PageTable::~PageTable() } void -PageTable::allocate(Addr vaddr, int64_t size) +PageTable::allocate(Addr vaddr, int64_t size, bool clobber) { // starting address must be page aligned assert(pageOffset(vaddr) == 0); @@ -75,16 +75,13 @@ PageTable::allocate(Addr vaddr, int64_t size) DPRINTF(MMU, "Allocating Page: %#x-%#x\n", vaddr, vaddr+ size); for (; size > 0; size -= pageSize, vaddr += pageSize) { - PTableItr iter = pTable.find(vaddr); - - if (iter != pTable.end()) { + if (!clobber && (pTable.find(vaddr) != pTable.end())) { // already mapped - fatal("PageTable::allocate: address 0x%x already mapped", - vaddr); + fatal("PageTable::allocate: address 0x%x already mapped", vaddr); } pTable[vaddr] = TheISA::TlbEntry(process->M5_pid, vaddr, - process->system->new_page()); + process->system->new_page()); updateCache(vaddr, pTable[vaddr]); } } @@ -127,6 +124,21 @@ PageTable::deallocate(Addr vaddr, int64_t size) } +bool +PageTable::isUnmapped(Addr vaddr, int64_t size) +{ + // starting address must be page aligned + assert(pageOffset(vaddr) == 0); + + for (; size > 0; size -= pageSize, vaddr += pageSize) { + if (pTable.find(vaddr) != pTable.end()) { + return false; + } + } + + return true; +} + bool PageTable::lookup(Addr vaddr, TheISA::TlbEntry &entry) { -- cgit v1.2.3 From 6f9d294e8685f49d91af48065736ac1d67e53718 Mon Sep 17 00:00:00 2001 From: Steve Reinhardt Date: Sat, 22 Oct 2011 22:30:08 -0700 Subject: SE: move page allocation from PageTable to Process PageTable supported an allocate() call that called back through the Process to allocate memory, but did not have a method to map addresses without allocating new pages. It makes more sense for Process to do the allocation, so this method was renamed allocateMem() and moved to Process, and uses a new map() call on PageTable. The remaining uses of the process pointer in PageTable were only to get the name and the PID, so by passing these in directly in the constructor, we can make PageTable completely independent of Process. --- src/mem/page_table.cc | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-) (limited to 'src/mem/page_table.cc') diff --git a/src/mem/page_table.cc b/src/mem/page_table.cc index 745872319..7622c2d48 100644 --- a/src/mem/page_table.cc +++ b/src/mem/page_table.cc @@ -45,16 +45,14 @@ #include "debug/MMU.hh" #include "mem/page_table.hh" #include "sim/faults.hh" -#include "sim/process.hh" #include "sim/sim_object.hh" -#include "sim/system.hh" using namespace std; using namespace TheISA; -PageTable::PageTable(Process *_process, Addr _pageSize) +PageTable::PageTable(const std::string &__name, uint64_t _pid, Addr _pageSize) : pageSize(_pageSize), offsetMask(mask(floorLog2(_pageSize))), - process(_process) + pid(_pid), _name(__name) { assert(isPowerOf2(pageSize)); pTableCache[0].vaddr = 0; @@ -67,21 +65,20 @@ PageTable::~PageTable() } void -PageTable::allocate(Addr vaddr, int64_t size, bool clobber) +PageTable::map(Addr vaddr, Addr paddr, int64_t size, bool clobber) { // starting address must be page aligned assert(pageOffset(vaddr) == 0); DPRINTF(MMU, "Allocating Page: %#x-%#x\n", vaddr, vaddr+ size); - for (; size > 0; size -= pageSize, vaddr += pageSize) { + for (; size > 0; size -= pageSize, vaddr += pageSize, paddr += pageSize) { if (!clobber && (pTable.find(vaddr) != pTable.end())) { // already mapped fatal("PageTable::allocate: address 0x%x already mapped", vaddr); } - pTable[vaddr] = TheISA::TlbEntry(process->M5_pid, vaddr, - process->system->new_page()); + pTable[vaddr] = TheISA::TlbEntry(pid, vaddr, paddr); updateCache(vaddr, pTable[vaddr]); } } @@ -108,11 +105,11 @@ PageTable::remap(Addr vaddr, int64_t size, Addr new_vaddr) } void -PageTable::deallocate(Addr vaddr, int64_t size) +PageTable::unmap(Addr vaddr, int64_t size) { assert(pageOffset(vaddr) == 0); - DPRINTF(MMU, "Deallocating page: %#x-%#x\n", vaddr, vaddr+ size); + DPRINTF(MMU, "Unmapping page: %#x-%#x\n", vaddr, vaddr+ size); for (; size > 0; size -= pageSize, vaddr += pageSize) { PTableItr iter = pTable.find(vaddr); @@ -208,7 +205,7 @@ PageTable::serialize(std::ostream &os) PTableItr iter = pTable.begin(); PTableItr end = pTable.end(); while (iter != end) { - os << "\n[" << csprintf("%s.Entry%d", process->name(), count) << "]\n"; + os << "\n[" << csprintf("%s.Entry%d", name(), count) << "]\n"; paramOut(os, "vaddr", iter->first); iter->second.serialize(os); @@ -230,9 +227,9 @@ PageTable::unserialize(Checkpoint *cp, const std::string §ion) pTable.clear(); while(i < count) { - paramIn(cp, csprintf("%s.Entry%d", process->name(), i), "vaddr", vaddr); + paramIn(cp, csprintf("%s.Entry%d", name(), i), "vaddr", vaddr); entry = new TheISA::TlbEntry(); - entry->unserialize(cp, csprintf("%s.Entry%d", process->name(), i)); + entry->unserialize(cp, csprintf("%s.Entry%d", name(), i)); pTable[vaddr] = *entry; ++i; } -- cgit v1.2.3