diff options
Diffstat (limited to 'arch/arc/lib/start.S')
-rw-r--r-- | arch/arc/lib/start.S | 82 |
1 files changed, 18 insertions, 64 deletions
diff --git a/arch/arc/lib/start.S b/arch/arc/lib/start.S index 3408f45..82045ae 100644 --- a/arch/arc/lib/start.S +++ b/arch/arc/lib/start.S @@ -13,17 +13,14 @@ ENTRY(_start) /* Setup interrupt vector base that matches "__text_start" */ sr __ivt_start, [ARC_AUX_INTR_VEC_BASE] - /* Setup stack pointer */ + /* Setup stack- and frame-pointers */ mov %sp, CONFIG_SYS_INIT_SP_ADDR mov %fp, %sp - /* Clear bss */ - mov %r0, __bss_start - mov %r1, __bss_end - -clear_bss: - st.ab 0, [%r0, 4] - brlt %r0, %r1, clear_bss + /* Unconditionally disable caches */ + bl flush_dcache_all + bl dcache_disable + bl icache_disable /* Zero the one and only argument of "board_init_f" */ mov_s %r0, 0 @@ -31,67 +28,24 @@ clear_bss: ENDPROC(_start) /* - * void relocate_code (addr_sp, gd, addr_moni) + * void board_init_f_r_trampoline(stack-pointer address) * * This "function" does not return, instead it continues in RAM * after relocating the monitor code. * - * r0 = start_addr_sp - * r1 = new__gd - * r2 = relocaddr + * r0 = new stack-pointer */ -ENTRY(relocate_code) - /* - * r0-r12 might be clobbered by C functions - * so we use r13-r16 for storage here - */ - mov %r13, %r0 /* save addr_sp */ - mov %r14, %r1 /* save addr of gd */ - mov %r15, %r2 /* save addr of destination */ - - mov %r16, %r2 /* %r9 - relocation offset */ - sub %r16, %r16, __image_copy_start - -/* Set up the stack */ -stack_setup: - mov %sp, %r13 +ENTRY(board_init_f_r_trampoline) + /* Set up the stack- and frame-pointers */ + mov %sp, %r0 mov %fp, %sp -/* Check if monitor is loaded right in place for relocation */ - mov %r0, __image_copy_start - cmp %r0, %r15 /* skip relocation if code loaded */ - bz do_board_init_r /* in target location already */ - -/* Copy data (__image_copy_start - __image_copy_end) to new location */ - mov %r1, %r15 - mov %r2, __image_copy_end - sub %r2, %r2, %r0 /* r3 <- amount of bytes to copy */ - asr %r2, %r2, 2 /* r3 <- amount of words to copy */ - mov %lp_count, %r2 - lp copy_end - ld.ab %r2,[%r0,4] - st.ab %r2,[%r1,4] -copy_end: - -/* Fix relocations related issues */ - bl do_elf_reloc_fixups -#ifndef CONFIG_SYS_ICACHE_OFF - bl invalidate_icache_all -#endif -#ifndef CONFIG_SYS_DCACHE_OFF - bl flush_dcache_all -#endif - -/* Update position of intterupt vector table */ - lr %r0, [ARC_AUX_INTR_VEC_BASE] /* Read current position */ - add %r0, %r0, %r16 /* Update address */ - sr %r0, [ARC_AUX_INTR_VEC_BASE] /* Write new position */ + /* Update position of intterupt vector table */ + lr %r0, [ARC_AUX_INTR_VEC_BASE] + ld %r1, [%r25, GD_RELOC_OFF] + add %r0, %r0, %r1 + sr %r0, [ARC_AUX_INTR_VEC_BASE] -do_board_init_r: -/* Prepare for exection of "board_init_r" in relocated monitor */ - mov %r2, board_init_r /* old address of "board_init_r()" */ - add %r2, %r2, %r16 /* new address of "board_init_r()" */ - mov %r0, %r14 /* 1-st parameter: gd_t */ - mov %r1, %r15 /* 2-nd parameter: dest_addr */ - j [%r2] -ENDPROC(relocate_code) + /* Re-enter U-Boot by calling board_init_f_r */ + j board_init_f_r +ENDPROC(board_init_f_r_trampoline) |