diff options
Diffstat (limited to 'arch/powerpc/cpu/mpc83xx/start.S')
| -rw-r--r-- | arch/powerpc/cpu/mpc83xx/start.S | 36 |
1 files changed, 31 insertions, 5 deletions
diff --git a/arch/powerpc/cpu/mpc83xx/start.S b/arch/powerpc/cpu/mpc83xx/start.S index 00016877030..ff312892bc1 100644 --- a/arch/powerpc/cpu/mpc83xx/start.S +++ b/arch/powerpc/cpu/mpc83xx/start.S @@ -258,14 +258,40 @@ in_flash: #endif /* set up the stack pointer in our newly created - * cache-ram (r1) */ - lis r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@h - ori r1, r1, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@l + * cache-ram; use r3 to keep the new SP for now to + * avoid overiding the SP it uselessly */ + lis r3, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@h + ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@l + /* r4 = end of GD area */ + addi r4, r3, GENERATED_GBL_DATA_SIZE + + /* Zero GD area */ + li r0, 0 +1: + subi r4, r4, 1 + stb r0, 0(r4) + cmplw r3, r4 + bne 1b + +#ifdef CONFIG_SYS_MALLOC_F_LEN + +#if CONFIG_SYS_MALLOC_F_LEN + GENERATED_GBL_DATA_SIZE > CONFIG_SYS_INIT_RAM_SIZE +#error "CONFIG_SYS_MALLOC_F_LEN too large to fit into initial RAM." +#endif + + /* r3 = new stack pointer / pre-reloc malloc area */ + subi r3, r3, CONFIG_SYS_MALLOC_F_LEN + + /* Set pointer to pre-reloc malloc area in GD */ + stw r3, GD_MALLOC_BASE(r4) +#endif li r0, 0 /* Make room for stack frame header and */ - stwu r0, -4(r1) /* clear final stack frame so that */ - stwu r0, -4(r1) /* stack backtraces terminate cleanly */ + stwu r0, -4(r3) /* clear final stack frame so that */ + stwu r0, -4(r3) /* stack backtraces terminate cleanly */ + /* Finally, actually set SP */ + mr r1, r3 /* let the C-code set up the rest */ /* */ |