/* Mach device store backend Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc. Written by Miles Bader This file is part of the GNU Hurd. The GNU Hurd is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. The GNU Hurd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */ #include #include #include #include #include #include "store.h" static error_t dev_read (struct store *store, off_t addr, size_t index, mach_msg_type_number_t amount, void **buf, mach_msg_type_number_t *len) { return device_read (store->port, 0, addr, amount, (io_buf_ptr_t *)buf, len); } static error_t dev_write (struct store *store, off_t addr, size_t index, void *buf, mach_msg_type_number_t len, mach_msg_type_number_t *amount) { return device_write (store->port, 0, addr, (io_buf_ptr_t)buf, len, amount); } static error_t dev_decode (struct store_enc *enc, const struct store_class *const *classes, struct store **store) { return store_std_leaf_decode (enc, _store_device_create, store); } static error_t dev_open (const char *name, int flags, const struct store_class *const *classes, struct store **store) { return store_device_open (name, flags, store); } static error_t dopen (const char *name, device_t *device, int *mod_flags) { device_t dev_master; error_t err = get_privileged_ports (0, &dev_master); if (! err) { if (*mod_flags & STORE_HARD_READONLY) err = device_open (dev_master, D_READ, (char *)name, device); else { err = device_open (dev_master, D_WRITE | D_READ, (char *)name, device); if (err == ED_READ_ONLY) { err = device_open (dev_master, D_READ, (char *)name, device); if (! err) *mod_flags |= STORE_HARD_READONLY; } else if (! err) *mod_flags &= ~STORE_HARD_READONLY; } mach_port_deallocate (mach_task_self (), dev_master); } return err; } static void dclose (struct store *store) { mach_port_deallocate (mach_task_self (), store->port); store->port = MACH_PORT_NULL; } /* Return 0 if STORE's range is enforce by the kernel, otherwise an error. */ static error_t enforced (struct store *store) { if (store->num_runs != 1 || store->runs[0].start != 0) /* Can't enforce non-contiguous ranges, or one not starting at 0. */ return EINVAL; else /* See if the the current (one) range is that the kernel is enforcing. */ { size_t sizes[DEV_GET_SIZE_COUNT]; size_t sizes_len = DEV_GET_SIZE_COUNT; error_t err = device_get_status (store->port, DEV_GET_SIZE, sizes, &sizes_len); if (err) return err; assert (sizes_len == DEV_GET_SIZE_COUNT); if (sizes[DEV_GET_SIZE_RECORD_SIZE] != store->block_size || (store->runs[0].length != sizes[DEV_GET_SIZE_DEVICE_SIZE] >> store->log2_block_size)) return EINVAL; return 0; } } static error_t dev_set_flags (struct store *store, int flags) { if ((flags & ~(STORE_INACTIVE | STORE_ENFORCED)) != 0) /* Trying to set flags we don't support. */ return EINVAL; if (! ((store->flags | flags) & STORE_INACTIVE)) /* Currently active and staying that way, so we must be trying to set the STORE_ENFORCED flag. */ { error_t err = enforced (store); if (err) return err; } if (flags & STORE_INACTIVE) dclose (store); store->flags |= flags; /* When inactive, anything goes. */ return 0; } static error_t dev_clear_flags (struct store *store, int flags) { error_t err = 0; if ((flags & ~(STORE_INACTIVE | STORE_ENFORCED)) != 0) err = EINVAL; if (!err && (flags & STORE_INACTIVE)) err = store->name ? dopen (store->name, &store->port, &store->flags) : ENODEV; if (! err) store->flags &= ~flags; return err; } static error_t dev_map (const struct store *store, vm_prot_t prot, mach_port_t *memobj) { if (store->num_runs != 1) return EOPNOTSUPP; else { error_t err = device_map (store->port, prot, store->runs[0].start, store->runs[0].length, memobj, 0); if (err == ED_INVALID_OPERATION) err = EOPNOTSUPP; /* This device doesn't support paging. */ return err; } } struct store_class store_device_class = { STORAGE_DEVICE, "device", dev_read, dev_write, store_std_leaf_allocate_encoding, store_std_leaf_encode, dev_decode, dev_set_flags, dev_clear_flags, 0, 0, 0, dev_open, 0, dev_map }; /* Return a new store in STORE referring to the mach device DEVICE. Consumes the send right DEVICE. */ error_t store_device_create (device_t device, int flags, struct store **store) { struct store_run run; size_t sizes[DEV_GET_SIZE_COUNT], block_size; size_t sizes_len = DEV_GET_SIZE_COUNT; error_t err = device_get_status (device, DEV_GET_SIZE, sizes, &sizes_len); if (err) return err; assert (sizes_len == DEV_GET_SIZE_COUNT); block_size = sizes[DEV_GET_SIZE_RECORD_SIZE]; run.start = 0; run.length = sizes[DEV_GET_SIZE_DEVICE_SIZE] / block_size; flags |= STORE_ENFORCED; /* 'cause it's the whole device. */ return _store_device_create (device, flags, block_size, &run, 1, store); } /* Like store_device_create, but doesn't query the device for information. */ error_t _store_device_create (device_t device, int flags, size_t block_size, const struct store_run *runs, size_t num_runs, struct store **store) { return _store_create (&store_device_class, device, flags, block_size, runs, num_runs, 0, store); } /* Open the device NAME, and return the corresponding store in STORE. */ error_t store_device_open (const char *name, int flags, struct store **store) { device_t device; error_t err = dopen (name, &device, &flags); if (! err) { err = store_device_create (device, flags, store); if (! err) { err = store_set_name (*store, name); if (err) store_free (*store); } if (err) mach_port_deallocate (mach_task_self (), device); } return err; }