elks-enhanced - XT-Emporium

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/*
 * ELKS Solid State Disk test subdriver
 *
 * June 2020 Greg Haerr
 *
 * Use ramdisk utility for testing: (block argument = half of NUM_SECTS below)
 *      ramdisk /dev/ssd make 96
 *      mkfs /dev/ssd 96
 *      sync
 *      fsck -lvf /dev/ssd
 *      mount /dev/ssd /mnt
 *      cp /bin/ls /mnt
 *      /mnt/ls
 *      sync
 *      df /dev/ssd
 *      umount /dev/ssd
 *      fsck -lvf /dev/ssd
 */
#include <linuxmt/config.h>
#include <linuxmt/rd.h>
#include <linuxmt/major.h>
#include <linuxmt/fs.h>
#include <linuxmt/sched.h>
#include <linuxmt/kernel.h>
#include <linuxmt/mm.h>
#include <linuxmt/errno.h>
#include <linuxmt/debug.h>
#include "ssd.h"

#define NUM_SECTS       192             /* set to max # sectors on SSD device */

static segment_s *ssd_seg = 0;

/* initialize SSD device */
sector_t ssddev_init(void)
{
    return NUM_SECTS;   /* return max # 512-byte sectors on device */
}

int ssddev_ioctl(struct inode *inode, struct file *file,
                        unsigned int cmd, unsigned int arg)
{
    unsigned int sector;

    if (!suser())
        return -EPERM;

    switch (cmd) {
    case RDCREATE:
        debug_blk("SSD: ioctl make %d\n", arg); /* size ignored, always NUM_SECTS */
        if (ssd_seg)
            return -EBUSY;
        ssd_seg = seg_alloc((segext_t)NUM_SECTS << 5, SEG_FLAG_RAMDSK);
        if (!ssd_seg)
            return -ENOMEM;

        for (sector = 0; sector < NUM_SECTS; sector++) {
            unsigned long offset = (unsigned long)sector << 9;
            fmemsetw(0, ssd_seg->base + (unsigned int)(offset >> 4), 0, 256);
        }
        ssd_initialized = 1;
        return 0;

    case RDDESTROY:
        debug_blk("SSD: ioctl kill\n");
        if (ssd_seg) {
            invalidate_inodes(inode->i_rdev);
            invalidate_buffers(inode->i_rdev);
            seg_put(ssd_seg);
            ssd_seg = NULL;
            ssd_initialized = 0;
            return 0;
        }
        return -ENXIO;          /* return separate error if ramdisk not inited */
    }
    return -EINVAL;
}

/* write one sector to SSD */
int ssddev_write(sector_t start, char *buf, ramdesc_t seg)
{
    unsigned long offset = start << 9;

    xms_fmemcpyw(0, ssd_seg->base + (unsigned int)(offset >> 4), buf, seg,
        SD_FIXED_SECTOR_SIZE/2);
    return 1;   /* # sectors written */
}

/* read one sector from SSD */
int ssddev_read(sector_t start, char *buf, ramdesc_t seg)
{
    unsigned long offset = start << 9;

    xms_fmemcpyw(buf, seg, 0, ssd_seg->base + (unsigned int)(offset >> 4),
        SD_FIXED_SECTOR_SIZE/2);
    return 1;   /* # sectors read */
}
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