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documentation: implement on-demand paging for RISC-V devices

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It documents how the on-demand paging was implemented for RISC-V
devices and how it can be extended to other architectures.
This commit is contained in:
Tiago Medicci Serrano
2024-03-01 14:45:07 -03:00
committed by Xiang Xiao
parent c67502d9b4
commit e287ed9090
2 changed files with 95 additions and 19 deletions
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Documentation/platforms/risc-v/qemu-rv/boards/rv-virt/index.rst
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@@ -154,6 +154,22 @@ In `nsh`, applications can be run from the `/system/bin` directory::
nsh> /system/bin/hello
.. _knsh32_paging:
knsh32_paging
-------------
Similar to ``knsh32_romfs``, but enabling on-demand paging: this
configuration simulates a 4MiB device (using QEMU), but sets the number of
heap pages equal to ``CONFIG_ARCH_HEAP_NPAGES=2048``. This means that each
process's heap is 8MiB, whereas ``CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE`` is
``1048576`` (1MiB) represents the stack size of the processes (which is
allocated from the process's heap). This configuration is used for 32-bit
RISC-V which implements the Sv32 MMU specification and enables processes
to have their own address space larger than the available physical memory.
This is particularly useful for implementing a set of programming language
interpreters.
knsh32_romfs
------------