mpc83xx: use r4 instead of r2 in lock_ram_in_cache and unlock_ram_in_cache
PATCH 1/1 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 <[email protected]>
--- cpu/mpc83xx/start.S | 9 +++++---- 1 files changed, 5 insertions(+), 4 deletions(-)
cpu/mpc83xx/start.S +5 -4
@@ -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
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1.5.2.2