Changes between Version 50 and Version 51 of boot_procedure


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Timestamp:
Feb 28, 2019, 11:13:33 AM (5 months ago)
Author:
alain
Comment:

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  • boot_procedure

    v50 v51  
    7777but not at the same time, because in this phase, only core [0][0] is running, while all other cores are blocked in the preloaded, waiting to be activated by an IPI.
    7878
    79 This assembly code makes the assuption that the CP0 register containing the core gid (global hardware identifier) has a fixed format:                              *
    80  
    81 '''gid == (((x << Y_WIDTH) + y) << P_WIDTH) + lid'''                                          *
    82                                                                                            *
     79This assembly code makes the assuption that the CP0 register containing the core gid (global hardware identifier) has a fixed format:   '''gid''' == ('''cxy''' << 2) + '''lid'''
     80
    8381Each core running this code makes the 3 following actions:                                                                          *
    8482   * It initializes the core stack pointer depending on the '''lid''' value extracted from the '''gid''', using the BOOT_STACK_BASE and BOOT_STACK_SIZE parameters defined in the  ''boot_config.h'' file,                                                                    *
     
    8684   * It jumps to the boot_loader() C function defined in the ''boot.c'' file, passing the two (cxy , lid) arguments.
    8785
    88 In this sequencial phase, the core[0][0]  executes the following actions:
    89 
     86In this sequencial phase, the core[0][0]  executing this C function makes the following actions:
    9087   * The core[0][0] initializes 2 peripherals: The '''TTY''' terminal (channel 0)  to display log messages, and the '''IOC''' peripheral to access the disk.
    9188   * The core[0][0] initializes the boot-loader private FAT32 structure, allowing the boot loader to access files stored in the FAT32 file system on disk.