[SCM] GNU Mach branch, master, updated. v1.8-299-gb1f537b

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit b1f537b5e058512a263036b74d3b755301adaf96
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sat Aug 28 13:19:02 2021 +0200

    linux block: allow loading data up to 4GiB limit
    
    Linux drivers are only limited by the DMA32 constraint, not by the directmap
    constraint. But our segment order is currently set to
    DMA < DMA32 < DIRECTMAP < HIGHMEM (since that is what we will have in 64bit
    mode). In PAE mode this makes DMA32 limited to 800MiB.  Ideally we'd have
    DMA < DIRECTMAP < DMA32 < HIGHMEM but that'd make the memory code more
    complex, and we are to remove the Linux drivers anyway.  In the
    meanwhile, In non-PAE mode we can just use HIGHMEM which is already
    limited to 4GiB, that will do the work.
    
    * linux/dev/glue/block.c (VM_PAGE_LINUX): New macro.
    (device_read): Use VM_PAGE_LINUX instead of VM_PAGE_DMA32.

-----------------------------------------------------------------------

Summary of changes:
 linux/dev/glue/block.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)


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