Changes between Version 50 and Version 51 of io_operations


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Timestamp:
Jan 22, 2018, 2:49:20 PM (4 years ago)
Author:
alain
Comment:

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  • io_operations

    v50 v51  
    140140The target hardware architectures generally provide a variable - but bounded - number of text terminals (called TXT channels in ALMOS-MKH). The  actual number of terminals (NB_TXT_CHANNELS) is defined in the ''arch_info.bin'' file. We describe here how ALMOS-MKH uses these terminals:
    141141
    142 '''1)''' The TXT[0] terminal is reserved for the kernel. It is normally used by the kernel to display log and/or debug messages. It can only be used by the user processes for debug, through some specific system calls such as the panic() or display_xxx() functions, that should not be used in normal exploitation.
     142'''1)''' The TXT[0] terminal is reserved for the kernel. It is normally used by the kernel to display log and/or debug messages. It can also be used by user processes for debug, through the specific display_xxx() system calls, that should not be used in normal exploitation.
    143143
    144144'''2)''' The other (NB_TXT_CHANNELS - 1) terminals TXT[i] are shared resources used by user processes. During kernel initialization,  ALMOS-MKH creates the first INIT user process, that creates itself (NB_TXT_CHANNELS -1) KSH user processes (one shell per user text terminal). All processes created by a KSH[i] process share the same TXT[i] terminal as the parent process, and belong to the same group of process.