Changes in Memory Routines

[Sunil Kumar <skumar@cisunix.unh.edu>]

Hi All

I am porting a memory routine written in 2.2.12 version of linux to 2.4.0
version.
The routine maps a page into the user page table. The routine was using
couple of functions like mk_pte and MAP_NR. However while using these
functions in 2.4.0 causes compilation errors/warnings.
It looks MAP_NR is now replaced by virt_to_page function. And mk_pte
function which was earlier expecting an unsigned long as its first
parameter is now expecting struct *page as its first parameter in 2.4.0
version.

Any help in this matter will be appreciated.

Here is the code used in 2.2.12 version.

/*  this function maps the page used for dbuffer into the user page tables
at
    the correct linear address.

    argument:       the physical address of the page

    return value:   phy_address for OK, -1 for error
*/
static unsigned long put_dbuff_page_into_pt( struct task_struct *tsp,
                                                    unsigned long phy_addr
)
    {
    pte_t           *page_table;
    unsigned long   linear_address = TO_VIRTUAL(phy_addr);
    int             repeat = 10;
    unsigned long   new_phys = phy_addr;


    do  {/* calculating the position of the page table entry in page table */
        if( (page_table = get_empty_pgtable(tsp, linear_address)) == NULL)
            {
            printk("put_dbuff_page_into_pt: Out of mem for pt.\n");
            return -1;
            }

        if( !pte_none(*page_table) )
            {
            printk("put_dbuff_page_into_pt: PTE_VAL = %lx\n",
		pte_val(*page_table));
            dirty_pages[dp_count] = linear_address;
            dp_count++;
            if(!(new_phys = __get_free_page(GFP_KERNEL)))
                {
                printk("put_dbuff_page_into_pt: No free pages.\n");
                return -1;
                }
            linear_address = TO_VIRTUAL(new_phys);
            repeat--;
            }
        else
            repeat = 0;
        } while(repeat);

    *page_table = mk_pte(new_phys, PAGE_SHARED);
    mem_map_reserve(MAP_NR(new_phys));
    printk("p_d: l_a=%x\n", linear_address);

    return new_phys;
    }

Sunil Kumar
Dept of Computer Science
U of New Hampshire
Email:	skumar@cs.unh.edu
Voice:	603-295-4618 (R)


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