[SeaBIOS] [PATCH v3 2/2] malloc: use large ZoneHigh when there is enough memory

[Gerd Hoffmann]

In case there is enough memory installed use a large ZoneHigh.

Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
 src/config.h | 3 ++-
 src/malloc.c | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/config.h b/src/config.h
index 93c8dbc2d530..9abe355b6c47 100644
--- a/src/config.h
+++ b/src/config.h
@@ -17,7 +17,8 @@
 // Maximum number of map entries in the e820 map
 #define BUILD_MAX_E820 32
 // Space to reserve in high-memory for tables
-#define BUILD_MAX_HIGHTABLE (256*1024)
+#define BUILD_MIN_HIGHTABLE (256*1024)
+#define BUILD_MAX_HIGHTABLE (16*1024*1024)
 // Largest supported externaly facing drive id
 #define BUILD_MAX_EXTDRIVE 16
 // Number of bytes the smbios may be and still live in the f-segment
diff --git a/src/malloc.c b/src/malloc.c
index 7fa50a85595b..967e000f51ba 100644
--- a/src/malloc.c
+++ b/src/malloc.c
@@ -423,7 +423,7 @@ malloc_preinit(void)
 
     // Populate temp high ram
     u32 highram_start = 0;
-    u32 highram_size = BUILD_MAX_HIGHTABLE;
+    u32 highram_size = BUILD_MIN_HIGHTABLE;
     int i;
     for (i=e820_count-1; i>=0; i--) {
         struct e820entry *en = &e820_list[i];
@@ -434,6 +434,8 @@ malloc_preinit(void)
             continue;
         u32 s = en->start, e = end;
         if (!highram_start) {
+            if (e - s > BUILD_MAX_HIGHTABLE * 16)
+                highram_size = BUILD_MAX_HIGHTABLE;
             u32 newe = ALIGN_DOWN(e - highram_size, MALLOC_MIN_ALIGN);
             if (newe <= e && newe >= s) {
                 highram_start = newe;
-- 
2.35.1

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