/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright 2003 Vivien Chappelier * Copyright 2008 Thomas Bogendoerfer */ #ifndef __SOUND_AD1843_H #define __SOUND_AD1843_H struct snd_ad1843 { void *chip; int (*read)(void *chip, int reg); int (*write)(void *chip, int reg, int val); }; #define AD1843_GAIN_RECLEV 0 #define AD1843_GAIN_LINE 1 #define AD1843_GAIN_LINE_2 2 #define AD1843_GAIN_MIC 3 #define AD1843_GAIN_PCM_0 4 #define AD1843_GAIN_PCM_1 5 #define AD1843_GAIN_SIZE (AD1843_GAIN_PCM_1+1) int ad1843_get_gain_max(struct snd_ad1843 *ad1843, int id); int ad1843_get_gain(struct snd_ad1843 *ad1843, int id); int ad1843_set_gain(struct snd_ad1843 *ad1843, int id, int newval); int ad1843_get_recsrc(struct snd_ad1843 *ad1843); int ad1843_set_recsrc(struct snd_ad1843 *ad1843, int newsrc); void ad1843_setup_dac(struct snd_ad1843 *ad1843, unsigned int id, unsigned int framerate, snd_pcm_format_t fmt, unsigned int channels); void ad1843_shutdown_dac(struct snd_ad1843 *ad1843, unsigned int id); void ad1843_setup_adc(struct snd_ad1843 *ad1843, unsigned int framerate, snd_pcm_format_t fmt, unsigned int channels); void ad1843_shutdown_adc(struct snd_ad1843 *ad1843); int ad1843_init(struct snd_ad1843 *ad1843); #endif /* __SOUND_AD1843_H */ s'> summaryrefslogtreecommitdiff
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authorEmese Revfy <re.emese@gmail.com>2016-06-20 20:41:19 +0200
committerKees Cook <keescook@chromium.org>2016-10-10 14:51:44 -0700
commit38addce8b600ca335dc86fa3d48c890f1c6fa1f4 (patch)
tree6d191ed116f54aebd2e2c3e6c2937992ef86f928 /sound/soc/kirkwood/kirkwood.h
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 'sound/soc/kirkwood/kirkwood.h')