hvcall.c

来自「是关于linux2.5.1的完全源码」· C语言 代码 · 共 128 行

/*
 * HvCall.c
 * Copyright (C) 2001  Mike Corrigan IBM Corporation
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <asm/system.h>
#include <asm/page.h>
#include <asm/iSeries/HvCall.h>
#include <asm/iSeries/HvCallEvent.h>
#ifndef  _HVCALLSC_H
#include <asm/iSeries/HvCallSc.h>
#endif
#include <asm/iSeries/LparData.h>

#ifndef  _HVTYPES_H
#include <asm/iSeries/HvTypes.h>
#endif

//=====================================================================
// Note that this call takes at MOST one page worth of data
int HvCall_readLogBuffer(HvLpIndex lpIndex, void *buffer, u64 bufLen)
{
  struct HvLpBufferList *bufList;
  u64 bytesLeft = bufLen;
  u64 leftThisPage;
  u64 curPtr = (unsigned long) buffer;
  u64 retVal;
  int npages;
  int i;

  npages = 0;
  while (bytesLeft)
    {
      npages++;
      leftThisPage = ((curPtr & PAGE_MASK) + PAGE_SIZE) - curPtr;

      if (leftThisPage > bytesLeft)
	bytesLeft = 0;
      else
	bytesLeft -= leftThisPage;

      curPtr = (curPtr & PAGE_MASK) + PAGE_SIZE;
    }

  if (npages == 0)
    return 0;

  bufList = (struct HvLpBufferList *)kmalloc(npages * sizeof(struct HvLpBufferList), GFP_ATOMIC);
  bytesLeft = bufLen;
  curPtr = (unsigned long) buffer;
  for(i=0; i<npages; i++)
    {
      bufList[i].addr = virt_to_absolute(curPtr);
      
      leftThisPage = ((curPtr & PAGE_MASK) + PAGE_SIZE) - curPtr;

      if (leftThisPage > bytesLeft)
	{
	  bufList[i].len = bytesLeft;
	  bytesLeft = 0;
	}
      else
	{
	  bufList[i].len = leftThisPage;
	  bytesLeft -= leftThisPage;
	}

      curPtr = (curPtr & PAGE_MASK) + PAGE_SIZE;
    }


  retVal = HvCall3(HvCallBaseReadLogBuffer,lpIndex, virt_to_absolute((unsigned long)bufList), bufLen);

  kfree(bufList);

  return (int)retVal;
}

//=====================================================================
void HvCall_writeLogBuffer(const void *buffer, u64 bufLen)
{
  struct HvLpBufferList bufList;
  u64 bytesLeft = bufLen;
  u64 leftThisPage;
  u64 curPtr = (unsigned long) buffer;

  while (bytesLeft)
    {
      bufList.addr = virt_to_absolute( curPtr );
      
      leftThisPage = ((curPtr & PAGE_MASK) + PAGE_SIZE) - curPtr;

      if (leftThisPage > bytesLeft)
	{
	  bufList.len = bytesLeft;
	  bytesLeft = 0;
	}
      else
	{
	  bufList.len = leftThisPage;
	  bytesLeft -= leftThisPage;
	}

      HvCall2(HvCallBaseWriteLogBuffer, virt_to_absolute((unsigned long)&bufList), bufList.len);

      curPtr = (curPtr & PAGE_MASK) + PAGE_SIZE;
    }
}