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Fix interlock implementation on x86_64 and x86.

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This commit is contained in:
Jonas 'Sortie' Termansen 2013-01-04 00:50:28 +01:00
parent 986d331d39
commit aea6aefea9
5 changed files with 13 additions and 126 deletions
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1
sortix/Makefile
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@ -87,7 +87,6 @@ bga.o \
calltrace.o \
com.o \
$(CPU)/calltrace.o \
$(CPU)/interlock.o \
$(CPU)/kthread.o \
crc32.o \
descriptors.o \

4
sortix/include/sortix/kernel/interlock.h
View file

@ -1,6 +1,6 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012.
Copyright(C) Jonas 'Sortie' Termansen 2012, 2013.
This file is part of Sortix.
@ -34,7 +34,7 @@ typedef struct
unsigned long n; // new value
} ilret_t;
// These atomicly modifies a value and return the previous value.
// These atomically modifies a value and return the previous value.
ilret_t InterlockedModify(unsigned long* ptr,
ilockfunc f,
unsigned long user = 0);

17
sortix/interlock.cpp
View file

@ -1,6 +1,6 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012.
Copyright(C) Jonas 'Sortie' Termansen 2012, 2013.
This file is part of Sortix.
@ -29,15 +29,20 @@ namespace Sortix {
// TODO: This is likely not the most optimal way to perform these operations.
extern "C" ilret_t asm_interlocked_modify(unsigned long* val,
ilockfunc f,
unsigned long user);
ilret_t InterlockedModify(unsigned long* ptr,
ilockfunc f,
unsigned long user)
{
return asm_interlocked_modify(ptr, f, user);
unsigned long old_value, new_value;
do
{
old_value = *((volatile unsigned long*) ptr); /* TODO: Need volatile? */
new_value = f(old_value, user);
} while ( !__sync_bool_compare_and_swap(ptr, old_value, new_value) );
ilret_t ret;
ret.o = old_value;
ret.n = new_value;
return ret;
}
static unsigned long AddFunction(unsigned long val, unsigned long arg)

56
sortix/x64/interlock.s
View file

@ -1,56 +0,0 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012.
This file is part of Sortix.
Sortix 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 3 of the License, or (at your option) any later
version.
Sortix 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
Sortix. If not, see <http://www.gnu.org/licenses/>.
x64/interlock.s
Functions that perform non-atomic operations in an atomic manner.
*******************************************************************************/
.section .text
# Atomicly runs a function on a value and returns the unmodified value.
# ilret_t
# asm_interlocked_modify(unsigned long* val,
# unsigned long (*func)(unsigned long, unsigned long),
# unsigned long user);
.global asm_interlocked_modify
.type asm_interlocked_modify, @function
asm_interlocked_modify:
pushq %rbp
movq %rsp, %rbp
asm_interlocked_modify_retry:
# Save our parameters in case we need to retry.
pushq %rdi
pushq %rsi
pushq %rdx
# Read the current value and calculate the replacement.
movq (%rdi), %rdi
movq %rdx, %rsi
callq *%rsi
movq %rax, %rdx
popq %rax
popq %rdi
popq %rsi
# Atomicly assign the replacement if the value is unchanged.
cmpxchgq %rdx, (%rdi)
# Retry if the value was modified by someone else.
jnz asm_interlocked_modify_retry
# Return the old value in %rax, new one in %rdx.
leaveq
retq

61
sortix/x86/interlock.s
View file

@ -1,61 +0,0 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2012.
This file is part of Sortix.
Sortix 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 3 of the License, or (at your option) any later
version.
Sortix 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
Sortix. If not, see <http://www.gnu.org/licenses/>.
x86/interlock.s
Functions that perform non-atomic operations in an atomic manner.
*******************************************************************************/
.section .text
# Atomicly runs a function on a value and returns the unmodified value.
# ilret_t
# asm_interlocked_modify(unsigned long* val,
# unsigned long (*func)(unsigned long, unsigned long),
# unsigned long user);
.global asm_interlocked_modify
.type asm_interlocked_modify, @function
asm_interlocked_modify:
pushl %ebp
movl %esp, %ebp
pushl %ebx
asm_interlocked_modify_retry:
# Read the current value and calculate the replacement.
movl 20(%ebp), %ecx # user
movl 16(%ebp), %edx # func
movl 12(%ebp), %ebx # val
movl (%ebx), %ebx # *val
pushl %ecx
pushl %ebx
call *%edx
# Atomicly assign the replacement if the value is unchanged.
movl %eax, %edx # New value in %edx
movl %ebx, %eax # Old value in %eax
movl 8(%ebp), %ebx # val
cmpxchgl %edx, (%ebx)
# Retry if the value was modified by someone else.
jnz asm_interlocked_modify_retry
# According to the calling convention, the first parameter is secretly a
# pointer to where we store the result, the old value first, then the new.
movl 8(%ebp), %ebx
movl %eax, 0(%ebx)
movl %edx, 4(%ebx)
popl %ebx
leavel
retl $0x4