Split /dev/nvram driver out of isa/clock.c for i386 and amd64. I have not

refactored it to be a generic device.
Instead of being part of the standard kernel, there is now a 'nvram' device
for i386/amd64.  It is in DEFAULTS like io and mem, and can be turned off
with 'nodevice nvram'.  This matches the previous behavior when it was
first committed.

1 files changed, 1 insertions, 96 deletions

diff --git a/sys/i386/isa/clock.c b/sys/i386/isa/clock.c
index 4b848c4e20a4..a67db3173a5b 100644
--- a/sys/i386/isa/clock.c
+++ b/sys/i386/isa/clock.c
@@ -438,7 +438,7 @@ rtcin(reg)
 	return (val);
 }
 
-static void
+void
 writertc(int reg, u_char val)
 {
 
@@ -938,99 +938,4 @@ static devclass_t attimer_devclass;
 DRIVER_MODULE(attimer, isa, attimer_driver, attimer_devclass, 0, 0);
 DRIVER_MODULE(attimer, acpi, attimer_driver, attimer_devclass, 0, 0);
 
-/*
- * Linux-style /dev/nvram driver
- *
- * cmos ram starts at bytes 14 through 128, for a total of 114 bytes.
- * bytes 16 through 31 are checksummed at byte 32.
- * Unlike Linux, you have to take care of the checksums yourself.
- * The driver exposes byte 14 as file offset 0.
- */
-
-#define NVRAM_FIRST	RTC_DIAG	/* 14 */
-#define NVRAM_LAST	128
-
-static d_open_t		nvram_open;
-static d_read_t		nvram_read;
-static d_write_t	nvram_write;
-
-static struct cdev *nvram_dev;
-
-static struct cdevsw nvram_cdevsw = {
-	.d_version =	D_VERSION,
-	.d_flags =	D_NEEDGIANT,
-	.d_open =	nvram_open,
-	.d_read =	nvram_read,
-	.d_write =	nvram_write,
-	.d_name =	"nvram",
-};
-
-static int
-nvram_open(struct cdev *dev __unused, int flags, int fmt __unused,
-    struct thread *td)
-{
-	int error = 0;
-
-	if (flags & FWRITE)
-		error = securelevel_gt(td->td_ucred, 0);
-
-	return (error);
-}
-
-static int
-nvram_read(struct cdev *dev, struct uio *uio, int flags)
-{
-	int nv_off;
-	u_char v;
-	int error = 0;
-
-	while (uio->uio_resid > 0 && error == 0) {
-		nv_off = uio->uio_offset + NVRAM_FIRST;
-		if (nv_off < NVRAM_FIRST || nv_off >= NVRAM_LAST)
-			return (0);	/* Signal EOF */
-		/* Single byte at a time */
-		v = rtcin(nv_off);
-		error = uiomove(&v, 1, uio);
-	}
-	return (error);
-
-}
-
-static int
-nvram_write(struct cdev *dev, struct uio *uio, int flags)
-{
-	int nv_off;
-	u_char v;
-	int error = 0;
-
-	while (uio->uio_resid > 0 && error == 0) {
-		nv_off = uio->uio_offset + NVRAM_FIRST;
-		if (nv_off < NVRAM_FIRST || nv_off >= NVRAM_LAST)
-			return (0);	/* Signal EOF */
-		/* Single byte at a time */
-		error = uiomove(&v, 1, uio);
-		writertc(nv_off, v);
-	}
-	return (error);
-}
-
-static int
-nvram_modevent(module_t mod __unused, int type, void *data __unused)
-{
-	switch (type) {
-	case MOD_LOAD:
-		nvram_dev = make_dev(&nvram_cdevsw, 0,
-		    UID_ROOT, GID_KMEM, 0640, "nvram");
-		break;
-	case MOD_UNLOAD:
-	case MOD_SHUTDOWN:
-		destroy_dev(nvram_dev);
-		break;
-	default:
-		return (EOPNOTSUPP);
-	}
-	return (0);
-}
-DEV_MODULE(nvram, nvram_modevent, NULL);
-
 #endif /* DEV_ISA */