[SeaBIOS] [PATCH] docs: Add info on MODE16/MODESEGMENT compile time flags

Kevin O'Connor kevin at koconnor.net
Mon Dec 29 15:22:56 CET 2014

Signed-off-by: Kevin O'Connor <kevin at koconnor.net>
 docs/Memory_Model.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/docs/Memory_Model.md b/docs/Memory_Model.md
index c77fc22..196b57b 100644
--- a/docs/Memory_Model.md
+++ b/docs/Memory_Model.md
@@ -108,6 +108,15 @@ assembled using ".code16gcc". SeaBIOS is careful to use segment
 registers properly so that the same code can run in the different
 16bit modes that it needs to support.
+C code mode flags
+Two compile time flags are available to determine the memory model the
+code is intended for: MODE16 and MODESEGMENT. When compiling for the
+16 bit modes, MODE16 is true and MODESEGMENT is true. In 32bit
+segmented mode, MODE16 is false and MODESEGMENT is true. In 32bit flat
+mode both MODE16 and MODESEGMENT are false.
 Common memory used at run-time

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