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https://github.com/compute-blade-community/compute-blade-agent.git
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28 lines
565 B
Go
28 lines
565 B
Go
package bcm2711
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import (
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"os"
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"reflect"
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"syscall"
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"unsafe"
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)
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func mmap(file *os.File, base int64, lenght int) ([]uint32, []uint8, error) {
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mem8, err := syscall.Mmap(
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int(file.Fd()),
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base,
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lenght,
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syscall.PROT_READ|syscall.PROT_WRITE,
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syscall.MAP_SHARED,
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)
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if err != nil {
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return nil, nil, err
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}
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// We'll have to work with 32 bit registers, so let's convert it.
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header := *(*reflect.SliceHeader)(unsafe.Pointer(&mem8))
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header.Len /= (32 / 8)
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header.Cap /= (32 / 8)
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mem32 := *(*[]uint32)(unsafe.Pointer(&header))
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return mem32, mem8, nil
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}
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