/* * Driver for PowerMac AWACS * Copyright (c) 2001 by Takashi Iwai * based on dmasound.c. * * This program 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 of the License, or * (at your option) any later version. * * This program 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 02111-1307 USA */ #include #include #include #include #include #include #include "pmac.h" #include "awacs.h" #include "burgundy.h" #define CHIP_NAME "PMac" MODULE_DESCRIPTION("PowerMac"); MODULE_SUPPORTED_DEVICE("{{Apple,PowerMac}}"); MODULE_LICENSE("GPL"); static int index = SNDRV_DEFAULT_IDX1; /* Index 0-MAX */ static char *id = SNDRV_DEFAULT_STR1; /* ID for this card */ static bool enable_beep = 1; module_param(index, int, 0444); MODULE_PARM_DESC(index, "Index value for " CHIP_NAME " soundchip."); module_param(id, charp, 0444); MODULE_PARM_DESC(id, "ID string for " CHIP_NAME " soundchip."); module_param(enable_beep, bool, 0444); MODULE_PARM_DESC(enable_beep, "Enable beep using PCM."); static struct platform_device *device; /* */ static int snd_pmac_probe(struct platform_device *devptr) { struct snd_card *card; struct snd_pmac *chip; char *name_ext; int err; err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card); if (err < 0) return err; if ((err = snd_pmac_new(card, &chip)) < 0) goto __error; card->private_data = chip; switch (chip->model) { case PMAC_BURGUNDY: strcpy(card->driver, "PMac Burgundy"); strcpy(card->shortname, "PowerMac Burgundy"); sprintf(card->longname, "%s (Dev %d) Sub-frame %d", card->shortname, chip->device_id, chip->subframe); if ((err = snd_pmac_burgundy_init(chip)) < 0) goto __error; break; case PMAC_DACA: strcpy(card->driver, "PMac DACA"); strcpy(card->shortname, "PowerMac DACA"); sprintf(card->longname, "%s (Dev %d) Sub-frame %d", card->shortname, chip->device_id, chip->subframe); if ((err = snd_pmac_daca_init(chip)) < 0) goto __error; break; case PMAC_TUMBLER: case PMAC_SNAPPER: name_ext = chip->model == PMAC_TUMBLER ? "Tumbler" : "Snapper"; sprintf(card->driver, "PMac %s", name_ext); sprintf(card->shortname, "PowerMac %s", name_ext); sprintf(card->longname, "%s (Dev %d) Sub-frame %d", card->shortname, chip->device_id, chip->subframe); if ( snd_pmac_tumbler_init(chip) < 0 || snd_pmac_tumbler_post_init() < 0) goto __error; break; case PMAC_AWACS: case PMAC_SCREAMER: name_ext = chip->model == PMAC_SCREAMER ? "Screamer" : "AWACS"; sprintf(card->driver, "PMac %s", name_ext); sprintf(card->shortname, "PowerMac %s", name_ext); if (chip->is_pbook_3400) name_ext = " [PB3400]"; else if (chip->is_pbook_G3) name_ext = " [PBG3]"; else name_ext = ""; sprintf(card->longname, "%s%s Rev %d", card->shortname, name_ext, chip->revision); if ((err = snd_pmac_awacs_init(chip)) < 0) goto __error; break; default: snd_printk(KERN_ERR "unsupported hardware %d\n", chip->model); err = -EINVAL; goto __error; } if ((err = snd_pmac_pcm_new(chip)) < 0) goto __error; chip->initialized = 1; if (enable_beep) snd_pmac_attach_beep(chip); if ((err = snd_card_register(card)) < 0) goto __error; platform_set_drvdata(devptr, card); return 0; __error: snd_card_free(card); return err; } static int snd_pmac_remove(struct platform_device *devptr) { snd_card_free(platform_get_drvdata(devptr)); return 0; } #ifdef CONFIG_PM_SLEEP static int snd_pmac_driver_suspend(struct device *dev) { struct snd_card *card = dev_get_drvdata(dev); snd_pmac_suspend(card->private_data); return 0; } static int snd_pmac_driver_resume(struct device *dev) { struct snd_card *card = dev_get_drvdata(dev); snd_pmac_resume(card->private_data); return 0; } static SIMPLE_DEV_PM_OPS(snd_pmac_pm, snd_pmac_driver_suspend, snd_pmac_driver_resume); #define SND_PMAC_PM_OPS &snd_pmac_pm #else #define SND_PMAC_PM_OPS NULL #endif #define SND_PMAC_DRIVER "snd_powermac" static struct platform_driver snd_pmac_driver = { .probe = snd_pmac_probe, .remove = snd_pmac_remove, .driver = { .name = SND_PMAC_DRIVER, .pm = SND_PMAC_PM_OPS, }, }; static int __init alsa_card_pmac_init(void) { int err; if ((err = platform_driver_register(&snd_pmac_driver)) < 0) return err; device = platform_device_register_simple(SND_PMAC_DRIVER, -1, NULL, 0); return 0; } static void __exit alsa_card_pmac_exit(void) { if (!IS_ERR(device)) platform_device_unregister(device); platform_driver_unregister(&snd_pmac_driver); } module_init(alsa_card_pmac_init) module_exit(alsa_card_pmac_exit) it/include/soc/arc?h=nds-private-remove&id=38addce8b600ca335dc86fa3d48c890f1c6fa1f4'>38addce8b600ca335dc86fa3d48c890f1c6fa1f4 (patch) tree6d191ed116f54aebd2e2c3e6c2937992ef86f928 /include/soc/arc parentc8d2bc9bc39ebea8437fd974fdbc21847bb897a3 (diff)
gcc-plugins: Add latent_entropy plugin
This adds a new gcc plugin named "latent_entropy". It is designed to extract as much possible uncertainty from a running system at boot time as possible, hoping to capitalize on any possible variation in CPU operation (due to runtime data differences, hardware differences, SMP ordering, thermal timing variation, cache behavior, etc). At the very least, this plugin is a much more comprehensive example for how to manipulate kernel code using the gcc plugin internals. The need for very-early boot entropy tends to be very architecture or system design specific, so this plugin is more suited for those sorts of special cases. The existing kernel RNG already attempts to extract entropy from reliable runtime variation, but this plugin takes the idea to a logical extreme by permuting a global variable based on any variation in code execution (e.g. a different value (and permutation function) is used to permute the global based on loop count, case statement, if/then/else branching, etc). To do this, the plugin starts by inserting a local variable in every marked function. The plugin then adds logic so that the value of this variable is modified by randomly chosen operations (add, xor and rol) and random values (gcc generates separate static values for each location at compile time and also injects the stack pointer at runtime). The resulting value depends on the control flow path (e.g., loops and branches taken). Before the function returns, the plugin mixes this local variable into the latent_entropy global variable. The value of this global variable is added to the kernel entropy pool in do_one_initcall() and _do_fork(), though it does not credit any bytes of entropy to the pool; the contents of the global are just used to mix the pool. Additionally, the plugin can pre-initialize arrays with build-time random contents, so that two different kernel builds running on identical hardware will not have the same starting values. Signed-off-by: Emese Revfy <re.emese@gmail.com> [kees: expanded commit message and code comments] Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'include/soc/arc')