root/kernel/blk_drv/ramdisk.c~

/* */

/*
 *  linux/kernel/blk_drv/ramdisk.c
 *
 *  Written by Theodore Ts'o
 */

#include <linux/config.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/hdreg.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/segment.h>

#define MAJOR_NR 2
#include "blk.h"

void do_ram_request(void)
{
        int i,r;
        unsigned int block,dev;
        unsigned int sec,head,cyl;
        unsigned int nsect;

        INIT_REQUEST;
        dev = MINOR(CURRENT->dev);
        block = CURRENT->sector;
        if (dev >= 5*NR_HD || block+2 > hd[dev].nr_sects) {
                end_request(0);
                goto repeat;
        }
        block += hd[dev].start_sect;
        dev /= 5;
        __asm__("divl %4":"=a" (block),"=d" (sec):"0" (block),"1" (0),
                "r" (hd_info[dev].sect));
        __asm__("divl %4":"=a" (cyl),"=d" (head):"0" (block),"1" (0),
                "r" (hd_info[dev].head));
        sec++;
        nsect = CURRENT->nr_sectors;
        if (CURRENT->cmd == WRITE) {
                hd_out(dev,nsect,sec,head,cyl,WIN_WRITE,&write_intr);
                for(i=0 ; i<3000 && !(r=inb_p(HD_STATUS)&DRQ_STAT) ; i++)
                        /* nothing */ ;
                if (!r) {
                        reset_hd(CURRENT_DEV);
                        return;
                }
                port_write(HD_DATA,CURRENT->buffer,256);
        } else if (CURRENT->cmd == READ) {
                hd_out(dev,nsect,sec,head,cyl,WIN_READ,&read_intr);
        } else
                panic("unknown hd-command");
}

void ram_init(void)
{

}

/* */