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// IBM_PROLOG_BEGIN_TAG
// This is an automatically generated prolog.
//
// $Source: src/include/kernel/vmmmgr.H $
//
// IBM CONFIDENTIAL
//
// COPYRIGHT International Business Machines Corp. 2010 - 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
#ifndef __KERNEL_VMMMGR_H
#define __KERNEL_VMMMGR_H
#include <limits.h>
#include <sys/mmio.h>
#include <sys/mm.h>
#include <kernel/types.h>
#include <kernel/spinlock.H>
class MessageQueue;
class VmmManager
{
public:
/**
* Constants used throughout the virtual memory management classes
*/
enum VMM_CONSTS
{
FULL_MEM_SIZE = 4*MEGABYTE,
// put the Page Table at the end of our memory space
PTSIZE = (1 << 18),
HTABORG = (FULL_MEM_SIZE - PTSIZE),
};
enum ACCESS_TYPES
{
NO_USER_ACCESS,
READ_O_ACCESS,
NORMAL_ACCESS,
CI_ACCESS,
RO_EXE_ACCESS,
};
enum castout_t
{
NORMAL,
CRITICAL,
};
/**
* Kernel mapped page removal operations
*
* RELEASE : Writes dirty&write-tracked pages out to a storage device
* and removes other pages
* FLUSH : Only writes dirty&write-tracked pages out to a storage
* device
* EVICT : (Kernel) Writes dirty&write-tracked pages out to a storage
* device and removes other pages
*/
enum PAGE_REMOVAL_OPS
{
RELEASE = 0,
FLUSH = 1,
EVICT = 2,
};
static void init();
static void init_slb();
/**
* @brief Responsible for handling PTE misses.
*
* @param[in] t - Task causing the page fault.
* @param[in] effAddr - Effective address accessed to cause fault.
*
* @return true - PTE miss was successfully handled.
*
* If the PTE miss is not successfully handled, the exception
* handler should collect debug information and kill the task.
*/
static bool pteMiss(task_t* t, uint64_t effAddr);
static void* mmioMap(void*, size_t);
static int mmioUnmap(void*, size_t);
/**
* @brief Map a device into the device segment(2TB)
* @param ra[in] - Void pointer to real address to be mapped in
* @param i_devDataSize[in] - Size of device segment block
* @return void* - Pointer to beginning virtual address, NULL otherwise
*/
static void* devMap(void* ra, SEG_DATA_SIZES i_devDataSize);
/**
* @brief Unmap a device from the device segment(2TB)
* @param ea[in] - Void pointer to effective address
* @return int - 0 for successful unmap, non-zero otherwise
*/
static int devUnmap(void* ea);
/**
* @brief Allocates a block of virtual memory of the given size
* @param i_mq[in] - Message queue to be associated with the block
* @param i_va[in] - Page aligned base virtual address of the block
* to be allocated
* @param i_size[in] - Requested virtual memory size of the block
* @return int - 0 for successful block allocation, non-zero otherwise
*/
static int mmAllocBlock(MessageQueue* i_mq,void* i_va,uint64_t i_size);
/**
* @brief Find the phyiscal address bound to the given address
* @param[in] i_vaddr The address
* @return the physical address or -EFAULT @see errno.h
*/
static uint64_t findPhysicalAddress(uint64_t i_vaddr);
/**
* @brief Cast out older physical memory pages
* @param[in] castout constraint
*/
static void castOutPages(castout_t i_ct);
/**
* @brief Flush pagetable, Update shadow page info
*/
static void flushPageTable( void);
/**
* @brief Remove pages by a specified operation of the given size
* @param[in] i_op - Page removal operation to perform
* @param[in] i_vaddr - Virtual address associated to page(s)
* @param[in] i_size - Size of memory to perform page removal on
* @param[in] i_task - OPTIONAL:Task requesting page removal.
* @return int - 0 for successful page removal, non-zero otherwise
*
* The given virtual address will be 'rounded' down to the nearest page
* boundary, along with the given size will be 'rounded' up to the
* nearest divisible page size.
*
* When a task is given, it will be deferred until all pages requested
* for removal have completed.
*/
static int mmRemovePages(VmmManager::PAGE_REMOVAL_OPS i_op,
void* i_vaddr, uint64_t i_size,
task_t* i_task = NULL);
/**
* @brief Sets the permissions for a given page or range of pages
* @param i_va[in] - Virtual address of the page to update permission
* @param i_size[in] - range of memory that needs permissions updated...
* if i_size equals 0 then we only need to update an
* individual page.
* @return int - 0 for successful permission update, non-zero otherwise
*
* The given virtual address will be 'rounded' down to the nearest page
* boundary, along with the given size will be 'rounded' up to the
* nearest divisible page size.
*/
static int mmSetPermission(void* i_va,uint64_t i_size, uint64_t i_access_type);
protected:
VmmManager();
~VmmManager() {};
/** @brief Get spinlock for memory subsystem.
* This is useful for passing to a deferred user-space message
* handler so that the subsystem code is SMP-safe when the message
* response is obtained.
*/
static Spinlock* getLock();
private:
Spinlock lock;
void initPTEs();
void initSDR1();
bool _pteMiss(task_t*, uint64_t);
/** See findPhysicalAddress */
uint64_t _findPhysicalAddress(uint64_t i_vaddr);
/* See mmSetPermission */
int _mmSetPermission(void* i_va,uint64_t i_size, uint64_t i_access_type);
/** See castOutPages */
void _castOutPages(castout_t i_ct);
/** See flushPageTable */
void _flushPageTable( void );
/** See mmAllocBlock */
int _mmAllocBlock(MessageQueue* i_mq,void* i_va,uint64_t i_size);
/** See mmRemovePages */
int _mmRemovePages(VmmManager::PAGE_REMOVAL_OPS i_op,void* i_vaddr,
uint64_t i_size,task_t* i_task);
public:
friend class Block;
};
#endif
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