ec150c7e09
Back in 2016, we discussed[1] rules for headers, and these were
generally liked:
1. Have a carefully curated header that's included everywhere first. We
got that already thanks to Peter: osdep.h.
2. Headers should normally include everything they need beyond osdep.h.
If exceptions are needed for some reason, they must be documented in
the header. If all that's needed from a header is typedefs, put
those into qemu/typedefs.h instead of including the header.
3. Cyclic inclusion is forbidden.
This patch gets include/ closer to obeying 2.
It's actually extracted from my "[RFC] Baby steps towards saner
headers" series[2], which demonstrates a possible path towards
checking 2 automatically. It passes the RFC test there.
[1] Message-ID: <87h9g8j57d.fsf@blackfin.pond.sub.org>
https://lists.nongnu.org/archive/html/qemu-devel/2016-03/msg03345.html
[2] Message-Id: <20190711122827.18970-1-armbru@redhat.com>
https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg02715.html
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20190812052359.30071-2-armbru@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
/*
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* QEMU MC146818 RTC emulation
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*
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* Copyright (c) 2003-2004 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* 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, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef MC146818RTC_REGS_H
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#define MC146818RTC_REGS_H
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#include "qemu/timer.h"
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#define RTC_ISA_IRQ 8
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#define RTC_SECONDS 0
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#define RTC_SECONDS_ALARM 1
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#define RTC_MINUTES 2
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#define RTC_MINUTES_ALARM 3
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#define RTC_HOURS 4
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#define RTC_HOURS_ALARM 5
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#define RTC_ALARM_DONT_CARE 0xC0
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#define RTC_DAY_OF_WEEK 6
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#define RTC_DAY_OF_MONTH 7
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#define RTC_MONTH 8
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#define RTC_YEAR 9
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#define RTC_REG_A 10
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#define RTC_REG_B 11
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#define RTC_REG_C 12
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#define RTC_REG_D 13
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/* PC cmos mappings */
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#define RTC_CENTURY 0x32
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#define RTC_IBM_PS2_CENTURY_BYTE 0x37
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#define REG_A_UIP 0x80
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#define REG_B_SET 0x80
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#define REG_B_PIE 0x40
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#define REG_B_AIE 0x20
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#define REG_B_UIE 0x10
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#define REG_B_SQWE 0x08
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#define REG_B_DM 0x04
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#define REG_B_24H 0x02
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#define REG_C_UF 0x10
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#define REG_C_IRQF 0x80
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#define REG_C_PF 0x40
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#define REG_C_AF 0x20
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#define REG_C_MASK 0x70
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static inline uint32_t periodic_period_to_clock(int period_code)
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{
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if (!period_code) {
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return 0;
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}
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if (period_code <= 2) {
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period_code += 7;
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}
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/* period in 32 Khz cycles */
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return 1 << (period_code - 1);
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}
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#define RTC_CLOCK_RATE 32768
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static inline int64_t periodic_clock_to_ns(int64_t clocks)
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{
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return muldiv64(clocks, NANOSECONDS_PER_SECOND, RTC_CLOCK_RATE);
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}
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#endif
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