MIPS: add support for pre-relocation malloc
Implement MIPS specific setup of the gd_t structure to support
pre-relocation malloc. If CONFIG_SYS_MALLOC_F_LEN is specified,
a memory area will be reserved after the initial stack area and
the gd->malloc_base pointer will be initialized.
After this patch the new driver model can be used on MIPS.
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/mips/cpu/mips32/start.S b/arch/mips/cpu/mips32/start.S
index 5946859..36b92cc 100644
--- a/arch/mips/cpu/mips32/start.S
+++ b/arch/mips/cpu/mips32/start.S
@@ -140,9 +140,31 @@
#endif
/* Set up temporary stack */
- li sp, CONFIG_SYS_INIT_SP_ADDR
+ li t0, -16
+ li t1, CONFIG_SYS_INIT_SP_ADDR
+ and sp, t1, t0 # force 16 byte alignment
+ sub sp, sp, GD_SIZE # reserve space for gd
+ and sp, sp, t0 # force 16 byte alignment
+ move k0, sp # save gd pointer
+#ifdef CONFIG_SYS_MALLOC_F_LEN
+ li t2, CONFIG_SYS_MALLOC_F_LEN
+ sub sp, sp, t2 # reserve space for early malloc
+ and sp, sp, t0 # force 16 byte alignment
+#endif
move fp, sp
+ /* Clear gd */
+ move t0, k0
+1:
+ sw zero, 0(t0)
+ blt t0, t1, 1b
+ addi t0, 4
+
+#ifdef CONFIG_SYS_MALLOC_F_LEN
+ addu t0, k0, GD_MALLOC_BASE # gd->malloc_base offset
+ sw sp, 0(t0)
+#endif
+
la t9, board_init_f
jr t9
move ra, zero