diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/setup_32.c | 3 | ||||
| -rw-r--r-- | arch/powerpc/lib/copy_32.S | 5 |
2 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c index bb02e9f6944e..b316ab787a3b 100644 --- a/arch/powerpc/kernel/setup_32.c +++ b/arch/powerpc/kernel/setup_32.c @@ -38,6 +38,7 @@ #include <asm/udbg.h> #include <asm/mmu_context.h> #include <asm/epapr_hcalls.h> +#include <asm/code-patching.h> #define DBG(fmt...) @@ -116,6 +117,8 @@ notrace void __init machine_init(u64 dt_ptr) /* Enable early debugging if any specified (see udbg.h) */ udbg_early_init(); + patch_instruction((unsigned int *)&memcpy, PPC_INST_NOP); + /* Do some early initialization based on the flat device tree */ early_init_devtree(__va(dt_ptr)); diff --git a/arch/powerpc/lib/copy_32.S b/arch/powerpc/lib/copy_32.S index 2ef50c629470..da5847d09718 100644 --- a/arch/powerpc/lib/copy_32.S +++ b/arch/powerpc/lib/copy_32.S @@ -128,6 +128,10 @@ _GLOBAL(memset) * the destination area is cacheable. * We only use this version if the source and dest don't overlap. * -- paulus. + * + * During early init, cache might not be active yet, so dcbz cannot be used. + * We therefore jump to generic_memcpy which doesn't use dcbz. This jump is + * replaced by a nop once cache is active. This is done in machine_init() */ _GLOBAL(memmove) cmplw 0,r3,r4 @@ -135,6 +139,7 @@ _GLOBAL(memmove) /* fall through */ _GLOBAL(memcpy) + b generic_memcpy add r7,r3,r5 /* test if the src & dst overlap */ add r8,r4,r5 cmplw 0,r4,r7 |