dm: x86: Support pre-reloc malloc()

Add support for this by reserving a block of memory below global_data.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index 71cab22e2a95008a4b72ad0b95dfbe79f13a066d..338bab19e471fdd3f4ab088aa999afeb2e10145e 100644 (file)
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -97,6 +97,13 @@ car_init_ret:
        /* Reserve space for global descriptor table */
        subl    $X86_GDT_SIZE, %esp
 
+#if defined(CONFIG_SYS_MALLOC_F_LEN)
+       subl    $CONFIG_SYS_MALLOC_F_LEN, %esp
+       movl    %eax, %edx
+       addl    $GD_MALLOC_BASE, %edx
+       movl    %esp, (%edx)
+#endif
+
        /* Align temporary global descriptor table to 16-byte boundary */
        andl    $0xfffffff0, %esp