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author | peter <peter@FreeBSD.org> | 2007-10-26 03:23:54 +0000 |
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committer | peter <peter@FreeBSD.org> | 2007-10-26 03:23:54 +0000 |
commit | 9c4d4d9a16e6f080b2248887812143e7cc0abf3f (patch) | |
tree | f39a0a61a976bda4b6ff5fcbced8330ff0a6dc72 /sys/isa | |
parent | 6349ab663a1b206161fc89983f0be884809286f7 (diff) | |
download | FreeBSD-src-9c4d4d9a16e6f080b2248887812143e7cc0abf3f.zip FreeBSD-src-9c4d4d9a16e6f080b2248887812143e7cc0abf3f.tar.gz |
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.
Diffstat (limited to 'sys/isa')
-rw-r--r-- | sys/isa/atrtc.c | 97 |
1 files changed, 1 insertions, 96 deletions
diff --git a/sys/isa/atrtc.c b/sys/isa/atrtc.c index 4b848c4..a67db31 100644 --- a/sys/isa/atrtc.c +++ b/sys/isa/atrtc.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 */ |