diff options
Diffstat (limited to 'cpu/ixp/start.S')
| -rw-r--r-- | cpu/ixp/start.S | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/cpu/ixp/start.S b/cpu/ixp/start.S index 2726f6597..757cfaa2d 100644 --- a/cpu/ixp/start.S +++ b/cpu/ixp/start.S @@ -211,7 +211,7 @@ reset: /* copy */ mov r0, #0 mov r4, r0 - add r2, r0, #0x40000 + add r2, r0, #CFG_MONITOR_LEN mov r1, #0x10000000 mov r5, r1 @@ -497,3 +497,29 @@ reset_cpu: reset_endless: b reset_endless + +#ifdef CONFIG_USE_IRQ + +.LC0: .word loops_per_jiffy + +/* + * 0 <= r0 <= 2000 + */ +.globl udelay +udelay: + mov r2, #0x6800 + orr r2, r2, #0x00db + mul r0, r2, r0 + ldr r2, .LC0 + ldr r2, [r2] @ max = 0x0fffffff + mov r0, r0, lsr #11 @ max = 0x00003fff + mov r2, r2, lsr #11 @ max = 0x0003ffff + mul r0, r2, r0 @ max = 2^32-1 + movs r0, r0, lsr #6 + +delay_loop: + subs r0, r0, #1 + bne delay_loop + mov pc, lr + +#endif /* CONFIG_USE_IRQ */ |