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doc: add two diagrams to user mode documentation

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One shows how globals are routed for automatic memory
domains. The other illustrates control flow when making
system calls.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
This commit is contained in:
Andrew Boie 2019-11-13 11:28:53 -08:00 • committed by Andrew Boie
commit cb87cc8fd6
4 changed files with 13 additions and 0 deletions
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7
doc/reference/usermode/syscalls.rst
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@ -170,6 +170,13 @@ necessary privilege elevation. In this layer, all arguments are treated as an
unsigned 32-bit type. There is always a 32-bit unsigned return value, which
may or may not be used.
.. figure:: syscall_flow.png
:alt: System Call execution flow
:width: 80%
:align: center
System Call execution flow
Some system calls may have more than six arguments. The number of
arguments passed via registers is limited to six for all
architectures. Additional arguments will need to be passed in an array