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 (file)
--- a/arch/mips/cpu/mips32/start.S
+++ b/arch/mips/cpu/mips32/start.S
@@ -140,9 +140,31 @@ reset:
 #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

diff --git a/arch/mips/cpu/mips64/start.S b/arch/mips/cpu/mips64/start.S
index 81df923..471bc1e 100644 (file)
--- a/arch/mips/cpu/mips64/start.S
+++ b/arch/mips/cpu/mips64/start.S
@@ -134,9 +134,31 @@ reset:
 #endif
 
        /* Set up temporary stack */
-       dli     sp, CONFIG_SYS_INIT_SP_ADDR
+       dli     t0, -16
+       dli     t1, CONFIG_SYS_INIT_SP_ADDR
+       and     sp, t1, t0              # force 16 byte alignment
+       dsub    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
+       dli     t2, CONFIG_SYS_MALLOC_F_LEN
+       dsub    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
+        daddi  t0, 4
+
+#ifdef CONFIG_SYS_MALLOC_F_LEN
+       daddu   t0, k0, GD_MALLOC_BASE  # gd->malloc_base offset
+       sw      sp, 0(t0)
+#endif
+
        dla     t9, board_init_f
        jr      t9
         move   ra, zero

diff --git a/arch/mips/include/asm/config.h b/arch/mips/include/asm/config.h
index 1c8a42b..3a891ba 100644 (file)
--- a/arch/mips/include/asm/config.h
+++ b/arch/mips/include/asm/config.h
@@ -7,8 +7,6 @@
 #ifndef _ASM_CONFIG_H_
 #define _ASM_CONFIG_H_
 
-#define CONFIG_SYS_GENERIC_GLOBAL_DATA
-
 #define CONFIG_LMB
 #define CONFIG_SYS_BOOT_RAMDISK_HIGH