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/*

 * 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.

 */

#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>

#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 = virt_to_absolute( (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 = virt_to_absolute( (unsigned long) buffer );

        for(i=0; i<npages; i++) {

                bufList[i].addr = 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 = virt_to_absolute((unsigned long) buffer);

        while (bytesLeft) {

                bufList.addr = 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;

        }

}