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// IBM_PROLOG_BEGIN_TAG
// This is an automatically generated prolog.
//
// $Source: src/kernel/basesegment.C $
//
// IBM CONFIDENTIAL
//
// COPYRIGHT International Business Machines Corp. 2011
//
// p1
//
// Object Code Only (OCO) source materials
// Licensed Internal Code Source Materials
// IBM HostBoot Licensed Internal Code
//
// The source code for this program is not published or other-
// wise divested of its trade secrets, irrespective of what has
// been deposited with the U.S. Copyright Office.
//
// Origin: 30
//
// IBM_PROLOG_END
#include <limits.h>
#include <errno.h>
#include <util/singleton.H>
#include <util/align.H>
#include <kernel/basesegment.H>
#include <kernel/segmentmgr.H>
#include <kernel/block.H>
#include <kernel/cpuid.H>
#include <kernel/console.H>
BaseSegment::~BaseSegment()
{
delete iv_block;
}
void BaseSegment::init()
{
Singleton<BaseSegment>::instance()._init();
}
void BaseSegment::_init()
{
// Assign segment to segment manager.
SegmentManager::addSegment(this, SegmentManager::BASE_SEGMENT_ID);
// Create initial static 3 or 8MB block.
switch (CpuID::getCpuType())
{
case CORE_POWER7:
case CORE_POWER7_PLUS:
case CORE_POWER8_VENICE:
iv_physMemSize = (8*MEGABYTE);
break;
case CORE_POWER8_SALERNO:
default:
iv_physMemSize = (4*MEGABYTE);
break;
}
// Base block is L3 cache physical memory size
iv_block = new Block(0x0, iv_physMemSize);
iv_block->setParent(this);
// TODO iv_physMemSize needs to be recalculated when DIMM memory is avail.
// Set default page permissions on block.
for (uint64_t i = 0; i < 0x800000; i += PAGESIZE)
{
// External address filled in by linker as start of kernel's
// data pages.
extern void* data_load_address;
// Don't map in the 0 (NULL) page.
if (i == 0) continue;
// Set pages in kernel text section to be read-only / executable.
if (((uint64_t)&data_load_address) > i)
{
iv_block->setPhysicalPage(i, i, VmmManager::RO_EXE_ACCESS);
}
// Set all other pages to initially be read/write. VFS will set
// permissions on pages outside kernel.
// (@TODO: Future Sprint, for now keep NORMAL_ACCESS as RWX, not RW.)
else
{
iv_block->setPhysicalPage(i, i, VmmManager::NORMAL_ACCESS);
}
}
}
bool BaseSegment::handlePageFault(task_t* i_task, uint64_t i_addr)
{
// Tail recursion to block chain.
return iv_block->handlePageFault(i_task, i_addr);
}
/**
* STATIC
* Allocates a block of virtual memory of the given size
*/
int BaseSegment::mmAllocBlock(MessageQueue* i_mq,void* i_va,uint64_t i_size)
{
return Singleton<BaseSegment>::instance()._mmAllocBlock(i_mq,i_va,i_size);
}
/**
* Allocates a block of virtual memory of the given size
*/
int BaseSegment::_mmAllocBlock(MessageQueue* i_mq,void* i_va,uint64_t i_size)
{
uint64_t l_vaddr = reinterpret_cast<uint64_t>(i_va);
uint64_t l_blockSizeTotal = 0;
iv_block->totalBlocksAlloc(l_blockSizeTotal);
//Verify input address and size falls within this segment's address range
if (l_vaddr < this->getBaseAddress() ||
l_vaddr >= (this->getBaseAddress() + (1ull << SLBE_s)) ||
(l_blockSizeTotal + ALIGN_PAGE(i_size)) >= (1ull << SLBE_s))
{
return -EINVAL;
}
Block* l_block = new Block(l_vaddr, ALIGN_PAGE(i_size), i_mq);
l_block->setParent(this);
iv_block->appendBlock(l_block);
return 0;
}
uint64_t BaseSegment::findPhysicalAddress(uint64_t i_vaddr) const
{
if(i_vaddr < iv_physMemSize) return i_vaddr;
return (iv_block ? iv_block->findPhysicalAddress(i_vaddr) : -EFAULT);
}
void BaseSegment::updateRefCount( uint64_t i_vaddr,
PageTableManager::UsageStats_t i_stats )
{
// Just call over to block chain
iv_block->updateRefCount(i_vaddr, i_stats);
}
/**
* STATIC
* Sets the Page Permissions for a given page via virtual address
*/
int BaseSegment::mmSetPermission(void* i_va, uint64_t i_size, uint64_t i_access_type)
{
return Singleton<BaseSegment>::instance()._mmSetPermission(i_va,i_size,i_access_type);
}
/**
* Sets the Page Permissions for a given page via virtual address
*/
int BaseSegment::_mmSetPermission(void* i_va, uint64_t i_size, uint64_t i_access_type)
{
int l_rc = 0;
Block *l_block = iv_block;
uint64_t l_va = reinterpret_cast<uint64_t>(i_va);
do
{
// If the va is not part of this block
if (!(l_block->isContained(l_va)))
{
// Check to see if there is a next block
if (l_block->iv_nextBlock)
{
// set local block to the next block
l_block = l_block->iv_nextBlock;
}
else
{
// address passed in does not fall into a block
return -EINVAL;
}
}
// The virtual address falls within this block
else
{
// Set the permission on the the current block.
return(l_block->mmSetPermission(l_va, i_size, i_access_type));
}
} while (l_block->iv_nextBlock);
return l_rc;
}
void BaseSegment::castOutPages(uint64_t i_type)
{
size_t cast_out = 0;
cast_out = iv_block->castOutPages(i_type);
// Could try again with a more agressive constraint if cast_out == 0 ????
if(cast_out) printkd("Cast out %ld pages,Type=%ld\n",cast_out,i_type);
}
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