mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 10:16:49 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
78 lines
2.0 KiB
ArmAsm
78 lines
2.0 KiB
ArmAsm
/* kernel_thread.S: kernel thread creation
|
|
*
|
|
* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/unistd.h>
|
|
|
|
#define CLONE_VM 0x00000100 /* set if VM shared between processes */
|
|
#define KERN_ERR "<3>"
|
|
|
|
.section .rodata
|
|
kernel_thread_emsg:
|
|
.asciz KERN_ERR "failed to create kernel thread: error=%d\n"
|
|
|
|
.text
|
|
.balign 4
|
|
|
|
###############################################################################
|
|
#
|
|
# Create a kernel thread
|
|
#
|
|
# int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
|
|
#
|
|
###############################################################################
|
|
.globl kernel_thread
|
|
.type kernel_thread,@function
|
|
kernel_thread:
|
|
or.p gr8,gr0,gr4
|
|
or gr9,gr0,gr5
|
|
|
|
# start by forking the current process, but with shared VM
|
|
setlos.p #__NR_clone,gr7 ; syscall number
|
|
ori gr10,#CLONE_VM,gr8 ; first syscall arg [clone_flags]
|
|
sethi.p #0xe4e4,gr9 ; second syscall arg [newsp]
|
|
setlo #0xe4e4,gr9
|
|
setlos.p #0,gr10 ; third syscall arg [parent_tidptr]
|
|
setlos #0,gr11 ; fourth syscall arg [child_tidptr]
|
|
tira gr0,#0
|
|
setlos.p #4095,gr7
|
|
andcc gr8,gr8,gr0,icc0
|
|
addcc.p gr8,gr7,gr0,icc1
|
|
bnelr icc0,#2
|
|
bc icc1,#0,kernel_thread_error
|
|
|
|
# now invoke the work function
|
|
or gr5,gr0,gr8
|
|
calll @(gr4,gr0)
|
|
|
|
# and finally exit the thread
|
|
setlos #__NR_exit,gr7 ; syscall number
|
|
tira gr0,#0
|
|
|
|
kernel_thread_error:
|
|
subi sp,#8,sp
|
|
movsg lr,gr4
|
|
sti gr8,@(sp,#0)
|
|
sti.p gr4,@(sp,#4)
|
|
|
|
or gr8,gr0,gr9
|
|
sethi.p %hi(kernel_thread_emsg),gr8
|
|
setlo %lo(kernel_thread_emsg),gr8
|
|
|
|
call printk
|
|
|
|
ldi @(sp,#4),gr4
|
|
ldi @(sp,#0),gr8
|
|
subi sp,#8,sp
|
|
jmpl @(gr4,gr0)
|
|
|
|
.size kernel_thread,.-kernel_thread
|