mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 18:26:40 +07:00
36a7eeaff7
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
258 lines
7.4 KiB
C
258 lines
7.4 KiB
C
/*
|
|
* PowerPC atomic bit operations.
|
|
*
|
|
* Merged version by David Gibson <david@gibson.dropbear.id.au>.
|
|
* Based on ppc64 versions by: Dave Engebretsen, Todd Inglett, Don
|
|
* Reed, Pat McCarthy, Peter Bergner, Anton Blanchard. They
|
|
* originally took it from the ppc32 code.
|
|
*
|
|
* Within a word, bits are numbered LSB first. Lot's of places make
|
|
* this assumption by directly testing bits with (val & (1<<nr)).
|
|
* This can cause confusion for large (> 1 word) bitmaps on a
|
|
* big-endian system because, unlike little endian, the number of each
|
|
* bit depends on the word size.
|
|
*
|
|
* The bitop functions are defined to work on unsigned longs, so for a
|
|
* ppc64 system the bits end up numbered:
|
|
* |63..............0|127............64|191...........128|255...........192|
|
|
* and on ppc32:
|
|
* |31.....0|63....32|95....64|127...96|159..128|191..160|223..192|255..224|
|
|
*
|
|
* There are a few little-endian macros used mostly for filesystem
|
|
* bitmaps, these work on similar bit arrays layouts, but
|
|
* byte-oriented:
|
|
* |7...0|15...8|23...16|31...24|39...32|47...40|55...48|63...56|
|
|
*
|
|
* The main difference is that bit 3-5 (64b) or 3-4 (32b) in the bit
|
|
* number field needs to be reversed compared to the big-endian bit
|
|
* fields. This can be achieved by XOR with 0x38 (64b) or 0x18 (32b).
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef _ASM_POWERPC_BITOPS_H
|
|
#define _ASM_POWERPC_BITOPS_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#ifndef _LINUX_BITOPS_H
|
|
#error only <linux/bitops.h> can be included directly
|
|
#endif
|
|
|
|
#include <linux/compiler.h>
|
|
#include <asm/asm-compat.h>
|
|
#include <asm/synch.h>
|
|
#include <asm/asm-405.h>
|
|
|
|
/* PPC bit number conversion */
|
|
#define PPC_BITLSHIFT(be) (BITS_PER_LONG - 1 - (be))
|
|
#define PPC_BIT(bit) (1UL << PPC_BITLSHIFT(bit))
|
|
#define PPC_BITMASK(bs, be) ((PPC_BIT(bs) - PPC_BIT(be)) | PPC_BIT(bs))
|
|
|
|
/* Put a PPC bit into a "normal" bit position */
|
|
#define PPC_BITEXTRACT(bits, ppc_bit, dst_bit) \
|
|
((((bits) >> PPC_BITLSHIFT(ppc_bit)) & 1) << (dst_bit))
|
|
|
|
#define PPC_BITLSHIFT32(be) (32 - 1 - (be))
|
|
#define PPC_BIT32(bit) (1UL << PPC_BITLSHIFT32(bit))
|
|
#define PPC_BITMASK32(bs, be) ((PPC_BIT32(bs) - PPC_BIT32(be))|PPC_BIT32(bs))
|
|
|
|
#define PPC_BITLSHIFT8(be) (8 - 1 - (be))
|
|
#define PPC_BIT8(bit) (1UL << PPC_BITLSHIFT8(bit))
|
|
#define PPC_BITMASK8(bs, be) ((PPC_BIT8(bs) - PPC_BIT8(be))|PPC_BIT8(bs))
|
|
|
|
#include <asm/barrier.h>
|
|
|
|
/* Macro for generating the ***_bits() functions */
|
|
#define DEFINE_BITOP(fn, op, prefix) \
|
|
static __inline__ void fn(unsigned long mask, \
|
|
volatile unsigned long *_p) \
|
|
{ \
|
|
unsigned long old; \
|
|
unsigned long *p = (unsigned long *)_p; \
|
|
__asm__ __volatile__ ( \
|
|
prefix \
|
|
"1:" PPC_LLARX(%0,0,%3,0) "\n" \
|
|
stringify_in_c(op) "%0,%0,%2\n" \
|
|
PPC405_ERR77(0,%3) \
|
|
PPC_STLCX "%0,0,%3\n" \
|
|
"bne- 1b\n" \
|
|
: "=&r" (old), "+m" (*p) \
|
|
: "r" (mask), "r" (p) \
|
|
: "cc", "memory"); \
|
|
}
|
|
|
|
DEFINE_BITOP(set_bits, or, "")
|
|
DEFINE_BITOP(clear_bits, andc, "")
|
|
DEFINE_BITOP(clear_bits_unlock, andc, PPC_RELEASE_BARRIER)
|
|
DEFINE_BITOP(change_bits, xor, "")
|
|
|
|
static __inline__ void set_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
set_bits(BIT_MASK(nr), addr + BIT_WORD(nr));
|
|
}
|
|
|
|
static __inline__ void clear_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
clear_bits(BIT_MASK(nr), addr + BIT_WORD(nr));
|
|
}
|
|
|
|
static __inline__ void clear_bit_unlock(int nr, volatile unsigned long *addr)
|
|
{
|
|
clear_bits_unlock(BIT_MASK(nr), addr + BIT_WORD(nr));
|
|
}
|
|
|
|
static __inline__ void change_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
change_bits(BIT_MASK(nr), addr + BIT_WORD(nr));
|
|
}
|
|
|
|
/* Like DEFINE_BITOP(), with changes to the arguments to 'op' and the output
|
|
* operands. */
|
|
#define DEFINE_TESTOP(fn, op, prefix, postfix, eh) \
|
|
static __inline__ unsigned long fn( \
|
|
unsigned long mask, \
|
|
volatile unsigned long *_p) \
|
|
{ \
|
|
unsigned long old, t; \
|
|
unsigned long *p = (unsigned long *)_p; \
|
|
__asm__ __volatile__ ( \
|
|
prefix \
|
|
"1:" PPC_LLARX(%0,0,%3,eh) "\n" \
|
|
stringify_in_c(op) "%1,%0,%2\n" \
|
|
PPC405_ERR77(0,%3) \
|
|
PPC_STLCX "%1,0,%3\n" \
|
|
"bne- 1b\n" \
|
|
postfix \
|
|
: "=&r" (old), "=&r" (t) \
|
|
: "r" (mask), "r" (p) \
|
|
: "cc", "memory"); \
|
|
return (old & mask); \
|
|
}
|
|
|
|
DEFINE_TESTOP(test_and_set_bits, or, PPC_ATOMIC_ENTRY_BARRIER,
|
|
PPC_ATOMIC_EXIT_BARRIER, 0)
|
|
DEFINE_TESTOP(test_and_set_bits_lock, or, "",
|
|
PPC_ACQUIRE_BARRIER, 1)
|
|
DEFINE_TESTOP(test_and_clear_bits, andc, PPC_ATOMIC_ENTRY_BARRIER,
|
|
PPC_ATOMIC_EXIT_BARRIER, 0)
|
|
DEFINE_TESTOP(test_and_change_bits, xor, PPC_ATOMIC_ENTRY_BARRIER,
|
|
PPC_ATOMIC_EXIT_BARRIER, 0)
|
|
|
|
static __inline__ int test_and_set_bit(unsigned long nr,
|
|
volatile unsigned long *addr)
|
|
{
|
|
return test_and_set_bits(BIT_MASK(nr), addr + BIT_WORD(nr)) != 0;
|
|
}
|
|
|
|
static __inline__ int test_and_set_bit_lock(unsigned long nr,
|
|
volatile unsigned long *addr)
|
|
{
|
|
return test_and_set_bits_lock(BIT_MASK(nr),
|
|
addr + BIT_WORD(nr)) != 0;
|
|
}
|
|
|
|
static __inline__ int test_and_clear_bit(unsigned long nr,
|
|
volatile unsigned long *addr)
|
|
{
|
|
return test_and_clear_bits(BIT_MASK(nr), addr + BIT_WORD(nr)) != 0;
|
|
}
|
|
|
|
static __inline__ int test_and_change_bit(unsigned long nr,
|
|
volatile unsigned long *addr)
|
|
{
|
|
return test_and_change_bits(BIT_MASK(nr), addr + BIT_WORD(nr)) != 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PPC64
|
|
static __inline__ unsigned long clear_bit_unlock_return_word(int nr,
|
|
volatile unsigned long *addr)
|
|
{
|
|
unsigned long old, t;
|
|
unsigned long *p = (unsigned long *)addr + BIT_WORD(nr);
|
|
unsigned long mask = BIT_MASK(nr);
|
|
|
|
__asm__ __volatile__ (
|
|
PPC_RELEASE_BARRIER
|
|
"1:" PPC_LLARX(%0,0,%3,0) "\n"
|
|
"andc %1,%0,%2\n"
|
|
PPC405_ERR77(0,%3)
|
|
PPC_STLCX "%1,0,%3\n"
|
|
"bne- 1b\n"
|
|
: "=&r" (old), "=&r" (t)
|
|
: "r" (mask), "r" (p)
|
|
: "cc", "memory");
|
|
|
|
return old;
|
|
}
|
|
|
|
/* This is a special function for mm/filemap.c */
|
|
#define clear_bit_unlock_is_negative_byte(nr, addr) \
|
|
(clear_bit_unlock_return_word(nr, addr) & BIT_MASK(PG_waiters))
|
|
|
|
#endif /* CONFIG_PPC64 */
|
|
|
|
#include <asm-generic/bitops/non-atomic.h>
|
|
|
|
static __inline__ void __clear_bit_unlock(int nr, volatile unsigned long *addr)
|
|
{
|
|
__asm__ __volatile__(PPC_RELEASE_BARRIER "" ::: "memory");
|
|
__clear_bit(nr, addr);
|
|
}
|
|
|
|
/*
|
|
* Return the zero-based bit position (LE, not IBM bit numbering) of
|
|
* the most significant 1-bit in a double word.
|
|
*/
|
|
#define __ilog2(x) ilog2(x)
|
|
|
|
#include <asm-generic/bitops/ffz.h>
|
|
|
|
#include <asm-generic/bitops/builtin-__ffs.h>
|
|
|
|
#include <asm-generic/bitops/builtin-ffs.h>
|
|
|
|
/*
|
|
* fls: find last (most-significant) bit set.
|
|
* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
|
|
*/
|
|
static __inline__ int fls(unsigned int x)
|
|
{
|
|
return 32 - __builtin_clz(x);
|
|
}
|
|
|
|
#include <asm-generic/bitops/builtin-__fls.h>
|
|
|
|
static __inline__ int fls64(__u64 x)
|
|
{
|
|
return 64 - __builtin_clzll(x);
|
|
}
|
|
|
|
#ifdef CONFIG_PPC64
|
|
unsigned int __arch_hweight8(unsigned int w);
|
|
unsigned int __arch_hweight16(unsigned int w);
|
|
unsigned int __arch_hweight32(unsigned int w);
|
|
unsigned long __arch_hweight64(__u64 w);
|
|
#include <asm-generic/bitops/const_hweight.h>
|
|
#else
|
|
#include <asm-generic/bitops/hweight.h>
|
|
#endif
|
|
|
|
#include <asm-generic/bitops/find.h>
|
|
|
|
/* Little-endian versions */
|
|
#include <asm-generic/bitops/le.h>
|
|
|
|
/* Bitmap functions for the ext2 filesystem */
|
|
|
|
#include <asm-generic/bitops/ext2-atomic-setbit.h>
|
|
|
|
#include <asm-generic/bitops/sched.h>
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_POWERPC_BITOPS_H */
|