[SeaBIOS] [PATCH 1/2] malloc: add on demand ZoneHigh expansion support

Gerd Hoffmann posted 2 patches 7 months, 1 week ago
[SeaBIOS] [PATCH 1/2] malloc: add on demand ZoneHigh expansion support
Posted by Gerd Hoffmann 7 months, 1 week ago
When running out of memory in ZoneHigh go alloc memory from ZoneTmpHigh,
add it as reserved to the e820 map and expand ZoneHigh

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 src/malloc.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/malloc.c b/src/malloc.c
index 3733855caf2c..02067b5370f9 100644
--- a/src/malloc.c
+++ b/src/malloc.c
@@ -226,6 +226,20 @@ zonelow_expand(u32 size, u32 align, struct allocinfo_s *fill)
     return alloc_new(&ZoneLow, size, align, fill);
 }
 
+static u32
+zonehigh_expand(u32 size, u32 align, struct allocinfo_s *fill)
+{
+    u32 xsize = ALIGN(size, BUILD_MAX_HIGHTABLE);
+    u32 xalign = align > PAGE_SIZE ? align : PAGE_SIZE;
+    u32 xdata = malloc_palloc(&ZoneTmpHigh, xsize, xalign);
+    if (!xdata)
+        return 0;
+
+    alloc_add(&ZoneHigh, xdata, xdata + xsize);
+    e820_add(xdata, size, E820_RESERVED);
+    return alloc_new(&ZoneHigh, size, align, fill);
+}
+
 
 /****************************************************************
  * tracked memory allocations
@@ -245,6 +259,8 @@ malloc_palloc(struct zone_s *zone, u32 size, u32 align)
     u32 data = alloc_new(zone, size, align, &tempdetail.datainfo);
     if (!CONFIG_MALLOC_UPPERMEMORY && !data && zone == &ZoneLow)
         data = zonelow_expand(size, align, &tempdetail.datainfo);
+    if (!data && zone == &ZoneHigh)
+        data = zonehigh_expand(size, align, &tempdetail.datainfo);
     if (!data)
         return 0;
 
-- 
2.35.1

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