The alignment constraint is defined in the CSM specifications as "Bit mapped. First non-zero bit from the right is the alignment."
Use __fls() to sanitise the alignment given that definition, since
passing a non-power-of-two alignment to _malloc() isn't going to work
well. And cope with being passed zero, which was happening for the
E820 table allocation from EDK2.
Signed-off-by: David Woodhouse <dw...@infradead.org>
---
src/fw/csm.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/fw/csm.c b/src/fw/csm.c
index 03b4bb8..bf7b8f5 100644
--- a/src/fw/csm.c
+++ b/src/fw/csm.c
@@ -264,6 +264,13 @@ handle_csm_0006(struct bregs *regs)
dprintf(3, "Legacy16GetTableAddress size %x align %x region %d\n",
size, align, region);
+ // DX = Required address alignment. Bit mapped.
+ // First non-zero bit from the right is the alignment.*/
+ if (align)
+ align = 1 << __ffs(align);
+ else
+ align = 1;
+
if (region & 2)
chunk = _malloc(&ZoneLow, size, align);
if (!chunk && (region & 1))
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