/* $OpenBSD: mem.c,v 1.15 2007/10/14 17:29:04 kettenis Exp $ */ /* $NetBSD: mem.c,v 1.1 1996/09/30 16:34:50 ws Exp $ */ /* * Copyright (c) 1988 University of Utah. * Copyright (c) 1982, 1986, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)mem.c 8.3 (Berkeley) 1/12/94 */ /* * Memory special file */ #include #include #include #include #include #include #include #include #include #include /* open counter for aperture */ #ifdef APERTURE static int ap_open_count = 0; extern int allowaperture; #endif #ifndef SMALL_KERNEL /* * The EEPROMs for Serial Presence Detect don't show up in the * OpenFirmware tree, but their contents are available through the * "dimm-info" property of the "/memory" node. To make the * information available, we fake up an I2C bus with EEPROMs * containing the appropriate slices of the "dimm-info" property. */ #include #include #include struct mem_softc { struct device sc_dev; uint8_t *sc_buf; int sc_len; }; /* Size of a single SPD entry in "dimm-info" property. */ #define SPD_SIZE 128 int mem_match(struct device *, void *, void *); void mem_attach(struct device *, struct device *, void *); struct cfdriver mem_cd = { NULL, "mem", DV_DULL }; struct cfattach mem_ca = { sizeof(struct mem_softc), mem_match, mem_attach }; int mem_i2c_acquire_bus(void *, int); void mem_i2c_release_bus(void *, int); int mem_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t, void *, size_t, int); int mem_match(struct device *parent, void *cf, void *aux) { struct confargs *ca = aux; if (strcmp(ca->ca_name, "mem") == 0) return (1); return (0); } void mem_attach(struct device *parent, struct device *self, void *aux) { struct mem_softc *sc = (struct mem_softc *)self; struct confargs *ca = aux; struct i2c_controller ic; struct i2c_attach_args ia; sc->sc_len = OF_getproplen(ca->ca_node, "dimm-info"); if (sc->sc_len > 0) { sc->sc_buf = malloc(sc->sc_len, M_DEVBUF, M_NOWAIT); if (sc->sc_buf == NULL) { printf("%s: can't allocate memory\n"); return; } } printf("\n"); if (sc->sc_len > 0) { OF_getprop(ca->ca_node, "dimm-info", sc->sc_buf, sc->sc_len); memset(&ic, 0, sizeof ic); ic.ic_cookie = sc; ic.ic_acquire_bus = mem_i2c_acquire_bus; ic.ic_release_bus = mem_i2c_release_bus; ic.ic_exec = mem_i2c_exec; memset(&ia, 0, sizeof ia); ia.ia_tag = ⁣ ia.ia_name = "spd"; ia.ia_addr = 0; while (ia.ia_addr * SPD_SIZE < sc->sc_len) { /* Skip entries that have not been filled in. */ if (sc->sc_buf[ia.ia_addr * SPD_SIZE] != 0) config_found(self, &ia, NULL); ia.ia_addr++; } /* No need to keep the "dimm-info" contents around. */ free(sc->sc_buf, M_DEVBUF); sc->sc_len = -1; } } int mem_i2c_acquire_bus(void *cookie, int flags) { return (0); } void mem_i2c_release_bus(void *cookie, int flags) { } int mem_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *cmdbuf, size_t cmdlen, void *buf, size_t len, int flags) { struct mem_softc *sc = cookie; size_t off; if (op != I2C_OP_READ_WITH_STOP || cmdlen != 1) return (EINVAL); off = addr * SPD_SIZE + *(uint8_t *)cmdbuf; if (off + len > sc->sc_len) return (EIO); memcpy(buf, &sc->sc_buf[off], len); return (0); } #endif /* SMALL_KERNEL */ /*ARGSUSED*/ int mmopen(dev_t dev, int flag, int mode, struct proc *p) { switch (minor(dev)) { case 0: case 1: case 2: case 12: break; #ifdef APERTURE case 4: if (suser(p, 0) != 0 || !allowaperture) return (EPERM); /* authorize only one simultaneous open() */ if (ap_open_count > 0) return(EPERM); ap_open_count++; break; #endif default: return (ENXIO); } return (0); } /*ARGSUSED*/ int mmclose(dev_t dev, int flag, int mode, struct proc *p) { #ifdef APERTURE if (minor(dev) == 4) ap_open_count--; #endif return 0; } /*ARGSUSED*/ int mmrw(dev_t dev, struct uio *uio, int flags) { vaddr_t v; vsize_t c; struct iovec *iov; int error = 0; static caddr_t zeropage; while (uio->uio_resid > 0 && error == 0) { iov = uio->uio_iov; if (iov->iov_len == 0) { uio->uio_iov++; uio->uio_iovcnt--; if (uio->uio_iovcnt < 0) panic("mmrw"); continue; } switch (minor(dev)) { /* minor device 0 is physical memory */ case 0: v = uio->uio_offset; c = uio->uio_resid; /* This doesn't allow device mapping! XXX */ pmap_real_memory(&v, &c); error = uiomove((caddr_t)v, c, uio); continue; /* minor device 1 is kernel memory */ case 1: v = uio->uio_offset; c = min(iov->iov_len, MAXPHYS); error = uiomove((caddr_t)v, c, uio); continue; /* minor device 2 is EOF/RATHOLE */ case 2: if (uio->uio_rw == UIO_WRITE) uio->uio_resid = 0; return 0; /* minor device 12 (/dev/zero) is source of nulls on read, * rathole on write */ case 12: if (uio->uio_rw == UIO_WRITE) { c = iov->iov_len; break; } if (zeropage == NULL) zeropage = malloc(PAGE_SIZE, M_TEMP, M_WAITOK | M_ZERO); c = min(iov->iov_len, PAGE_SIZE); error = uiomove(zeropage, c, uio); continue; default: return ENXIO; } if (error) break; iov->iov_base += c; iov->iov_len -= c; uio->uio_offset += c; uio->uio_resid -= c; } return error; } paddr_t mmmmap(dev_t dev, off_t off, int prot) { return (-1); } /*ARGSUSED*/ int mmioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) { return (EOPNOTSUPP); }