add malloc

Allocate the e820 map in the E-segment.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/malloc.c b/malloc.c
new file mode 100644
index 0000000..3ab95ed
--- /dev/null
+++ b/malloc.c
@@ -0,0 +1,21 @@
+#include <inttypes.h>
+#include "string.h"
+
+extern uint8_t edata;
+static uint8_t *fseg_base = &edata;
+
+extern uint8_t stext;
+static uint8_t *malloc_top = &stext;
+
+void *malloc(int n)
+{
+	malloc_top -= (n + 15) & -16;
+	return malloc_top;
+}
+
+void *malloc_fseg(int n)
+{
+	void *p = fseg_base;
+	fseg_base += (n + 15) & -16;
+	return p;
+}