| /* |
| * (C) Copyright 2000, 2001 |
| * Erik Theisen, Wave 7 Optics, etheisen@mindspring.com. |
| * base on code by |
| * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
| * MA 02110-1301 USA |
| */ |
| #include <ppc_asm.tmpl> |
| |
| .text |
| /* |
| * unsigned long long _get_ticks(void); |
| */ |
| .globl _get_ticks |
| _get_ticks: |
| 1: mftbu r3 |
| mftb r4 |
| mftbu r5 |
| cmpw 0,r3,r5 |
| bne 1b |
| blr |
| |
| /* |
| * Delay for a number of ticks |
| */ |
| .globl _wait_ticks |
| _wait_ticks: |
| mflr r8 /* save link register */ |
| mr r7, r3 /* save tick count */ |
| bl _get_ticks /* Get start time */ |
| |
| /* Calculate end time */ |
| addc r7, r4, r7 /* Compute end time lower */ |
| addze r6, r3 /* and end time upper */ |
| |
| 1: bl _get_ticks /* Get current time */ |
| subfc r4, r4, r7 /* Subtract current time from end time */ |
| subfe. r3, r3, r6 |
| bge 1b /* Loop until time expired */ |
| |
| mtlr r8 /* restore link register */ |
| blr |
| |