mirror of
https://github.com/tinygo-org/tinygo.git
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Matthew Hiles
259842dc2e
* add support for UEFI time and UEFI events; fix STOP \n -> \r\n conversion * apply EFI timezone offset
105 lines
2.2 KiB
Go
105 lines
2.2 KiB
Go
package uefi
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type EFI_TIME struct {
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Year uint16
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Month byte
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Day byte
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Hour byte
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Minute byte
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Second byte
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Pad1 byte
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Nanosecond uint32
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TimeZone int16
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Daylight byte
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Pad2 byte
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}
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type EFI_TIME_CAPABILITIES struct {
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Resolution uint32
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Accuracy uint32
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SetsToZero BOOLEAN
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}
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func GetTime() (EFI_TIME, EFI_STATUS) {
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var time EFI_TIME
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status := ST().RuntimeServices.GetTime(&time, nil)
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return time, status
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}
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func (t *EFI_TIME) GetEpoch() (sec int64, nsec int32) {
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if t.TimeZone != 0x07FF { // EFI_UNSPECIFIED_TIMEZONE
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sec -= int64(t.TimeZone) * 60
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}
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year := int(t.Year)
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month := int(t.Month)
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d := daysSinceEpoch(year)
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d += uint64(daysBefore[month-1])
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if isLeap(year) && month > 2 {
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d++
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}
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d += uint64(t.Day - 1)
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abs := d * secondsPerDay
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abs += uint64(uint64(t.Hour)*uint64(secondsPerHour) + uint64(t.Minute)*uint64(secondsPerMinute) + uint64(t.Second))
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sec = int64(abs) + (absoluteToInternal + internalToUnix)
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nsec = int32(t.Nanosecond)
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return
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}
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const (
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secondsPerMinute = 60
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secondsPerHour = 60 * secondsPerMinute
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secondsPerDay = 24 * secondsPerHour
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daysPer400Years = 365*400 + 97
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daysPer100Years = 365*100 + 24
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daysPer4Years = 365*4 + 1
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absoluteZeroYear = -292277022399
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internalYear = 1
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absoluteToInternal int64 = (absoluteZeroYear - internalYear) * 365.2425 * secondsPerDay
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unixToInternal int64 = (1969*365 + 1969/4 - 1969/100 + 1969/400) * secondsPerDay
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internalToUnix int64 = -unixToInternal
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)
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var daysBefore = [...]int32{
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0,
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31,
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31 + 28,
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31 + 28 + 31,
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31 + 28 + 31 + 30,
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31 + 28 + 31 + 30 + 31,
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31 + 28 + 31 + 30 + 31 + 30,
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31 + 28 + 31 + 30 + 31 + 30 + 31,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
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31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31,
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}
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func daysSinceEpoch(year int) uint64 {
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y := uint64(int64(year) - absoluteZeroYear)
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n := y / 400
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y -= 400 * n
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d := daysPer400Years * n
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n = y / 100
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y -= 100 * n
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d += daysPer100Years * n
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n = y / 4
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y -= 4 * n
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d += daysPer4Years * n
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d += 365 * y
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return d
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}
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func isLeap(year int) bool {
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return year%4 == 0 && (year%100 != 0 || year%400 == 0)
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}
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