45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
/*
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* Copyright (c) 2019 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <platform/cmos.h>
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#include <lk/trace.h>
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#include <lk/debug.h>
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#include <kernel/spinlock.h>
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#include <platform/pc.h>
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static spin_lock_t lock = SPIN_LOCK_INITIAL_VALUE;
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uint8_t cmos_read(uint8_t reg) {
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spin_lock_saved_state_t state;
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spin_lock_irqsave(&lock, state);
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outp(CMOS_CONTROL_REG, reg | 0x80);
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uint8_t val = inp(CMOS_DATA_REG);
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spin_unlock_irqrestore(&lock, state);
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return val;
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}
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