https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8 authored by Linus Torvalds on 01 March 2021, 00:05:19 UTC
Linux 5.12-rc1
Linux 5.12-rc1
Tip revision: fe07bfd
util.S
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copied from <file:arch/powerpc/kernel/misc_32.S>
*
* This file contains miscellaneous low-level functions.
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
* and Paul Mackerras.
*
* kexec bits:
* Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
* GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
*/
#include "ppc_asm.h"
#define SPRN_PVR 0x11F /* Processor Version Register */
.text
/* udelay needs to know the period of the
* timebase in nanoseconds. This used to be hardcoded to be 60ns
* (period of 66MHz/4). Now a variable is used that is initialized to
* 60 for backward compatibility, but it can be overridden as necessary
* with code something like this:
* extern unsigned long timebase_period_ns;
* timebase_period_ns = 1000000000 / bd->bi_tbfreq;
*/
.data
.globl timebase_period_ns
timebase_period_ns:
.long 60
.text
/*
* Delay for a number of microseconds
*/
.globl udelay
udelay:
mulli r4,r3,1000 /* nanoseconds */
/* Change r4 to be the number of ticks using:
* (nanoseconds + (timebase_period_ns - 1 )) / timebase_period_ns
* timebase_period_ns defaults to 60 (16.6MHz) */
mflr r5
bcl 20,31,0f
0: mflr r6
mtlr r5
addis r5,r6,(timebase_period_ns-0b)@ha
lwz r5,(timebase_period_ns-0b)@l(r5)
add r4,r4,r5
addi r4,r4,-1
divw r4,r4,r5 /* BUS ticks */
1: MFTBU(r5)
MFTBL(r6)
MFTBU(r7)
cmpw 0,r5,r7
bne 1b /* Get [synced] base time */
addc r9,r6,r4 /* Compute end time */
addze r8,r5
2: MFTBU(r5)
cmpw 0,r5,r8
blt 2b
bgt 3f
MFTBL(r6)
cmpw 0,r6,r9
blt 2b
3: blr