Currently, there is not a good way to control script flow based on
bitwise values. This initially led to NI adding the ability to read
a specific bit from a port-mapped register to control bootflow.
Here, we add a more generic ability to test the bitwise AND of a
value available to the grub scripting environment. This obviates the
need for the inbit command (which is currently OOT).
Signed-off-by: Brad Mouring <brad.mour...@ni.com>
---
docs/grub.texi | 2 ++
grub-core/commands/test.c | 10 ++++++++++
2 files changed, 12 insertions(+)
diff --git a/docs/grub.texi b/docs/grub.texi
index 82f6fa4..f28063e 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -5019,6 +5019,8 @@ the strings are not equal
@var{integer1} is less than @var{integer2}
@item @var{integer1} @code{-ne} @var{integer2}
@var{integer1} is not equal to @var{integer2}
+@item @var{integer1} @code{-bwa} @var{integer2}
+Performs a bitwise AND between @var{integer1} and @var{integer2}
@item @var{prefix}@var{integer1} @code{-pgt} @var{prefix}@var{integer2}
@var{integer1} is greater than @var{integer2} after stripping off common
non-numeric @var{prefix}.
@item @var{prefix}@var{integer1} @code{-plt} @var{prefix}@var{integer2}
diff --git a/grub-core/commands/test.c b/grub-core/commands/test.c
index 5f06642..af4fad7 100644
--- a/grub-core/commands/test.c
+++ b/grub-core/commands/test.c
@@ -290,6 +290,16 @@ test_parse (char **args, int *argn, int argc)
continue;
}
+ /* GRUB extension: bitwise AND */
+ if (grub_strcmp (args[*argn + 1], "-bwa") == 0)
+ {
+ update_val (grub_strtoul (args[*argn], 0, 0)
+ & grub_strtoul (args[*argn + 2], 0, 0), &ctx);
+ (*argn) += 3;
+ continue;
+ }
+
+
/* -nt and -ot tests. GRUB extension: when doing -?t<bias> bias
will be added to the first mtime. */
if (grub_memcmp (args[*argn + 1], "-nt", 3) == 0
--
2.9.0
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