xnu-2782.20.48.tar.gz

[apple/xnu.git] / bsd / dev / memdev.c

diff --git a/bsd/dev/memdev.c b/bsd/dev/memdev.c
index 58fecce01b4ae9b9dc857cf9e932c3ad4f9a7e86..5a659bebd3039b815e168024abc104721e8e304a 100644 (file)
--- a/bsd/dev/memdev.c
+++ b/bsd/dev/memdev.c
@@ -354,6 +354,7 @@ static int mdevioctl(dev_t dev, u_long cmd, caddr_t data, __unused int flag,
        u_int32_t *f;
        u_int64_t *o;
        int devid;
+       dk_memdev_info_t * memdev_info;
 
        devid = minor(dev);                                                                     /* Get minor device number */
 
@@ -364,6 +365,7 @@ static int mdevioctl(dev_t dev, u_long cmd, caddr_t data, __unused int flag,
 
        f = (u_int32_t*)data;
        o = (u_int64_t *)data;
+       memdev_info = (dk_memdev_info_t *) data;
 
        switch (cmd) {
 
@@ -408,7 +410,22 @@ static int mdevioctl(dev_t dev, u_long cmd, caddr_t data, __unused int flag,
                        if(!(mdev[devid].mdFlags & mdInited)) return (ENXIO);
                        *o = ((mdev[devid].mdSize << 12) + mdev[devid].mdSecsize - 1) / mdev[devid].mdSecsize;
                        break;
-                       
+
+               /*
+                * We're interested in the following bits of information:
+                *   Are you a memory-backed device (always yes, in this case)?
+                *   Physical memory (mdPhys)?
+                *   What is your base page?
+                *   What is your size?
+                */
+               case DKIOCGETMEMDEVINFO:
+                       if (!(mdev[devid].mdFlags & mdInited)) return (ENXIO);
+                       memdev_info->mi_mdev = TRUE;
+                       memdev_info->mi_phys = (mdev[devid].mdFlags & mdPhys) ? TRUE : FALSE;
+                       memdev_info->mi_base = mdev[devid].mdBase;
+                       memdev_info->mi_size = mdev[devid].mdSize;
+                       break;
+
                default:
                        error = ENOTTY;
                        break;