Change in coreboot[master]: [WIP]acpigen: Always return buffer with requested size

[Patrick Rudolph (Code Review)]

Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/25999

Change subject: [WIP]acpigen: Always return buffer with requested size
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[WIP]acpigen: Always return buffer with requested size

Pad a buffer with zero bytes to return the exact requested size.
Might be requied for nouveau.

Needs test on real hardware.

Change-Id: I3f0ecc42a21945f66eb67f73e511bd516acf0fa9
Signed-off-by: Patrick Rudolph 
---
M src/arch/x86/acpigen.c
1 file changed, 10 insertions(+), 3 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/99/25999/1

diff --git a/src/arch/x86/acpigen.c b/src/arch/x86/acpigen.c
index fc6cc66..d73f03a 100644
--- a/src/arch/x86/acpigen.c
+++ b/src/arch/x86/acpigen.c
@@ -1340,6 +1340,8 @@
  *		Store (0x1000, Local1)
  *	}
  *
+ *	Store (Local1, Local3)
+ *
  *	If (LGreater (Local0, 0x10000))
  *	{
  *		Return(Buffer(Local1){0})
@@ -1354,7 +1356,7 @@
  *		}
  *	}
  *
- *	Name (ROM1, Buffer (Local1) {0})
+ *	Name (ROM1, Buffer (Local3) {0})
  *
  *	Multiply (Local0, 0x08, Local0)
  *	Multiply (Local1, 0x08, Local1)
@@ -1416,6 +1418,11 @@
    /* Pop if */
    acpigen_pop_len();

+	/* Store (Local1, Local3) */
+	acpigen_write_store();
+	acpigen_emit_byte(LOCAL1_OP);
+	acpigen_emit_byte(LOCAL3_OP);
+
    /* If (LGreater (Local0, length)) */
    acpigen_write_if();
    acpigen_emit_byte(LGREATER_OP);
@@ -1462,11 +1469,11 @@
    /* Pop if */
    acpigen_pop_len();

-	/* Name (ROM1, Buffer (Local1) {0}) */
+	/* Name (ROM1, Buffer (Local3) {0}) */
    acpigen_write_name("ROM1");
    acpigen_emit_byte(BUFFER_OP);
    acpigen_write_len_f();
-	acpigen_emit_byte(LOCAL1_OP);
+	acpigen_emit_byte(LOCAL3_OP);
    acpigen_emit_byte(0);
    acpigen_pop_len();