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kvisc/vm/dv/devctl.c
2019-06-07 22:23:38 +02:00

108 lines
1.8 KiB
C

// The OS/K Team licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include <dv/dev.h>
#include <in/instrs.h>
//
// code common to devctl and iocall
//
dev_t *devctl_common(ctx_t *ctx, ulong v1, ulong v2)
{
dev_t *dev = devget(ctx, v1);
if (!dev)
rax = -2;
else if (dev->state == DEVPWOF)
rax = -3;
else if (dev->state == DEVFERR)
rax = -4;
else if (dev->state == DEVPLUG)
rax = -5;
else
return dev;
return NULL;
}
void copystr(ctx_t *ctx, ulong addr, ulong maxn, char *str)
{
for (; *str && maxn > 0; str++, addr++, maxn--) {
writemem8(ctx, *str, addr);
}
writemem8(ctx, 0, addr);
}
IMPL_START_2(devctl)
{
CHK_SUPERV();
dev_t *dev = devctl_common(ctx, v1, v2);
if (dev == NULL)
return 0;
switch (v2) {
case 0:
copystr(ctx, ax0, DEVLEN, dev->type);
break;
case 1:
copystr(ctx, ax0, DEVLEN, dev->name);
break;
case 2:
copystr(ctx, ax0, DEVLEN, dev->modl);
break;
case 3:
copystr(ctx, ax0, DEVLEN, dev->vend);
break;
case 4:
rax = dev->major;
rdx = dev->minor;
break;
case 5:
rax = dev->feats;
rdx = dev->revis;
break;
default:
rax = -6;
break;
}
}
IMPL_END;
IMPL_START_2(iocall)
{
CHK_SUPERV();
long rc;
dev_t *dev = devctl_common(ctx, v1, v2);
if (dev == NULL)
return 0;
if (v2 >= DEVSLOTS)
rax = -6;
else if (dev->fslots[v2] == NULL)
rax = -6;
else {
rc = dev->fslots[v2](ctx, dev);
if (rc < 0) rax = rc;
}
}
IMPL_END;