• Miodrag Dinic's avatar
    MIPS: cmdline: Add support for 'memmap' parameter · 296a7624
    Miodrag Dinic authored
    Implement support for parsing 'memmap' kernel command line parameter.
    
    This patch covers parsing of the following two formats for 'memmap'
    parameter values:
    
      - nn[KMG]@ss[KMG]
      - nn[KMG]$ss[KMG]
    
      ([KMG] = K M or G (kilo, mega, giga))
    
    These two allowed formats for parameter value are already documented
    in file kernel-parameters.txt in Documentation/admin-guide folder.
    Some architectures already support them, but Mips did not prior to
    this patch.
    
    Excerpt from Documentation/admin-guide/kernel-parameters.txt:
    
    memmap=nn[KMG]@ss[KMG]
        [KNL] Force usage of a specific region of memory.
        Region of memory to be used is from ss to ss+nn.
    
    memmap=nn[KMG]$ss[KMG]
        Mark specific memory as reserved.
        Region of memory to be reserved is from ss to ss+nn.
        Example: Exclude memory from 0x18690000-0x1869ffff
            memmap=64K$0x18690000
            or
            memmap=0x10000$0x18690000
    
    There is no need to update this documentation file with respect to
    this patch.
    Signed-off-by: default avatarMiodrag Dinic <miodrag.dinic@imgtec.com>
    Signed-off-by: default avatarGoran Ferenc <goran.ferenc@imgtec.com>
    Signed-off-by: default avatarAleksandar Markovic <aleksandar.markovic@imgtec.com>
    Cc: James.Hogan@imgtec.com
    Cc: Paul.Burton@imgtec.com
    Cc: Raghu.Gandham@imgtec.com
    Cc: Leonid.Yegoshin@imgtec.com
    Cc: Douglas.Leung@imgtec.com
    Cc: Petar.Jovanovic@imgtec.com
    Cc: linux-mips@linux-mips.org
    Patchwork: https://patchwork.linux-mips.org/patch/16508/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
    296a7624
setup.c 25.1 KB