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authorChasel, Chiu <chasel.chiu@intel.com>2019-01-23 16:12:38 +0800
committerChasel, Chiu <chasel.chiu@intel.com>2019-01-28 15:49:13 +0800
commit12a0a80b4aeeb9a8435ee785e685e33eb7ee451c (patch)
treeae71ffe34866958bcf99660e9c996b71cfb5fe60 /IntelFsp2Pkg/IntelFsp2Pkg.dec
parent35897da27ed289f086d2b528800fa60d6ef2407d (diff)
downloadedk2-12a0a80b4aeeb9a8435ee785e685e33eb7ee451c.tar.gz
IntelFsp2Pkg: FSP can utilize bootloader stack
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1485 Current FSP utilizes pre-allocated temporary memory from boot loader for both heap and stack. To reduce overall temporary memory usage FSP may share the same stack with boot loader and only needs a smaller memory for heap, no separate memory required for stack. Setting PcdFspHeapSizePercentage to 0 to enable FSP sharing stack with boot loader, in this case boot loader stack has to be large enough for FSP to use. Default is 50 (half memory heap and half memory stack) for backward compatible with original model. Test: Verified on internal platform and booting successfully with both modes. Cc: Nate DeSimone <nathaniel.l.desimone@intel.com> Cc: Star Zeng <star.zeng@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Chasel Chiu <chasel.chiu@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
Diffstat (limited to 'IntelFsp2Pkg/IntelFsp2Pkg.dec')
-rw-r--r--IntelFsp2Pkg/IntelFsp2Pkg.dec4
1 files changed, 4 insertions, 0 deletions
diff --git a/IntelFsp2Pkg/IntelFsp2Pkg.dec b/IntelFsp2Pkg/IntelFsp2Pkg.dec
index 64a31b3505..d4c6d221a1 100644
--- a/IntelFsp2Pkg/IntelFsp2Pkg.dec
+++ b/IntelFsp2Pkg/IntelFsp2Pkg.dec
@@ -86,8 +86,12 @@
gIntelFsp2PkgTokenSpaceGuid.PcdFspBootFirmwareVolumeBase|0xFFF80000|UINT32|0x10000003
gIntelFsp2PkgTokenSpaceGuid.PcdFspHeaderSpecVersion | 0x20| UINT8|0x00000002
+ #
# x % of FSP temporary memory will be used for heap
# (100 - x) % of FSP temporary memory will be used for stack
+ # 0 means FSP will share the stack with boot loader and FSP temporary memory is heap
+ # Note: This mode assumes boot loader stack is large enough for FSP to use.
+ #
gIntelFsp2PkgTokenSpaceGuid.PcdFspHeapSizePercentage | 50| UINT8|0x10000004
#
# Maximal Interrupt supported in IDT table.