mpc83xx: use r4 instead of r2 in lock_ram_in_cache and unlock_ram_in_cache

This is needed in unlock_ram_in_cache() because it is called from C and
will corrupt the small data area anchor that is kept in R2.

lock_ram_in_cache() is modified similarly as good coding practice, but
is not called from C.

Signed-off-by: Nick Spence <nick.spence@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

diff --git a/cpu/mpc83xx/start.S b/cpu/mpc83xx/start.S
index 16ed494..75ad36c 100644 (file)
--- a/cpu/mpc83xx/start.S
+++ b/cpu/mpc83xx/start.S
@@ -1060,9 +1060,9 @@ lock_ram_in_cache:
         */
        lis     r3, (CFG_INIT_RAM_ADDR & ~31)@h
        ori     r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l
-       li      r2, ((CFG_INIT_RAM_END & ~31) + \
+       li      r4, ((CFG_INIT_RAM_END & ~31) + \
                     (CFG_INIT_RAM_ADDR & 31) + 31) / 32
-       mtctr   r2
+       mtctr   r4
 1:
        dcbz    r0, r3
        addi    r3, r3, 32
@@ -1082,8 +1082,9 @@ unlock_ram_in_cache:
        /* invalidate the INIT_RAM section */
        lis     r3, (CFG_INIT_RAM_ADDR & ~31)@h
        ori     r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l
-       li      r2,512
-       mtctr   r2
+       li      r4, ((CFG_INIT_RAM_END & ~31) + \
+                    (CFG_INIT_RAM_ADDR & 31) + 31) / 32
+       mtctr   r4
 1:     icbi    r0, r3
        dcbi    r0, r3
        addi    r3, r3, 32