mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-02 18:26:39 +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!
461 lines
10 KiB
C
461 lines
10 KiB
C
/*
|
|
* bitops.h: Bit string operations on the ppc
|
|
*/
|
|
|
|
#ifdef __KERNEL__
|
|
#ifndef _PPC_BITOPS_H
|
|
#define _PPC_BITOPS_H
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/compiler.h>
|
|
#include <asm/byteorder.h>
|
|
#include <asm/atomic.h>
|
|
|
|
/*
|
|
* The test_and_*_bit operations are taken to imply a memory barrier
|
|
* on SMP systems.
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
#define SMP_WMB "eieio\n"
|
|
#define SMP_MB "\nsync"
|
|
#else
|
|
#define SMP_WMB
|
|
#define SMP_MB
|
|
#endif /* CONFIG_SMP */
|
|
|
|
static __inline__ void set_bit(int nr, volatile unsigned long * addr)
|
|
{
|
|
unsigned long old;
|
|
unsigned long mask = 1 << (nr & 0x1f);
|
|
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
|
|
|
|
__asm__ __volatile__("\n\
|
|
1: lwarx %0,0,%3 \n\
|
|
or %0,%0,%2 \n"
|
|
PPC405_ERR77(0,%3)
|
|
" stwcx. %0,0,%3 \n\
|
|
bne- 1b"
|
|
: "=&r" (old), "=m" (*p)
|
|
: "r" (mask), "r" (p), "m" (*p)
|
|
: "cc" );
|
|
}
|
|
|
|
/*
|
|
* non-atomic version
|
|
*/
|
|
static __inline__ void __set_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = 1 << (nr & 0x1f);
|
|
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
|
|
|
|
*p |= mask;
|
|
}
|
|
|
|
/*
|
|
* clear_bit doesn't imply a memory barrier
|
|
*/
|
|
#define smp_mb__before_clear_bit() smp_mb()
|
|
#define smp_mb__after_clear_bit() smp_mb()
|
|
|
|
static __inline__ void clear_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long old;
|
|
unsigned long mask = 1 << (nr & 0x1f);
|
|
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
|
|
|
|
__asm__ __volatile__("\n\
|
|
1: lwarx %0,0,%3 \n\
|
|
andc %0,%0,%2 \n"
|
|
PPC405_ERR77(0,%3)
|
|
" stwcx. %0,0,%3 \n\
|
|
bne- 1b"
|
|
: "=&r" (old), "=m" (*p)
|
|
: "r" (mask), "r" (p), "m" (*p)
|
|
: "cc");
|
|
}
|
|
|
|
/*
|
|
* non-atomic version
|
|
*/
|
|
static __inline__ void __clear_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = 1 << (nr & 0x1f);
|
|
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
|
|
|
|
*p &= ~mask;
|
|
}
|
|
|
|
static __inline__ void change_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long old;
|
|
unsigned long mask = 1 << (nr & 0x1f);
|
|
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
|
|
|
|
__asm__ __volatile__("\n\
|
|
1: lwarx %0,0,%3 \n\
|
|
xor %0,%0,%2 \n"
|
|
PPC405_ERR77(0,%3)
|
|
" stwcx. %0,0,%3 \n\
|
|
bne- 1b"
|
|
: "=&r" (old), "=m" (*p)
|
|
: "r" (mask), "r" (p), "m" (*p)
|
|
: "cc");
|
|
}
|
|
|
|
/*
|
|
* non-atomic version
|
|
*/
|
|
static __inline__ void __change_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = 1 << (nr & 0x1f);
|
|
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
|
|
|
|
*p ^= mask;
|
|
}
|
|
|
|
/*
|
|
* test_and_*_bit do imply a memory barrier (?)
|
|
*/
|
|
static __inline__ int test_and_set_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned int old, t;
|
|
unsigned int mask = 1 << (nr & 0x1f);
|
|
volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
|
|
|
|
__asm__ __volatile__(SMP_WMB "\n\
|
|
1: lwarx %0,0,%4 \n\
|
|
or %1,%0,%3 \n"
|
|
PPC405_ERR77(0,%4)
|
|
" stwcx. %1,0,%4 \n\
|
|
bne 1b"
|
|
SMP_MB
|
|
: "=&r" (old), "=&r" (t), "=m" (*p)
|
|
: "r" (mask), "r" (p), "m" (*p)
|
|
: "cc", "memory");
|
|
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
/*
|
|
* non-atomic version
|
|
*/
|
|
static __inline__ int __test_and_set_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = 1 << (nr & 0x1f);
|
|
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
|
|
unsigned long old = *p;
|
|
|
|
*p = old | mask;
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
static __inline__ int test_and_clear_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned int old, t;
|
|
unsigned int mask = 1 << (nr & 0x1f);
|
|
volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
|
|
|
|
__asm__ __volatile__(SMP_WMB "\n\
|
|
1: lwarx %0,0,%4 \n\
|
|
andc %1,%0,%3 \n"
|
|
PPC405_ERR77(0,%4)
|
|
" stwcx. %1,0,%4 \n\
|
|
bne 1b"
|
|
SMP_MB
|
|
: "=&r" (old), "=&r" (t), "=m" (*p)
|
|
: "r" (mask), "r" (p), "m" (*p)
|
|
: "cc", "memory");
|
|
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
/*
|
|
* non-atomic version
|
|
*/
|
|
static __inline__ int __test_and_clear_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = 1 << (nr & 0x1f);
|
|
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
|
|
unsigned long old = *p;
|
|
|
|
*p = old & ~mask;
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
static __inline__ int test_and_change_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned int old, t;
|
|
unsigned int mask = 1 << (nr & 0x1f);
|
|
volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);
|
|
|
|
__asm__ __volatile__(SMP_WMB "\n\
|
|
1: lwarx %0,0,%4 \n\
|
|
xor %1,%0,%3 \n"
|
|
PPC405_ERR77(0,%4)
|
|
" stwcx. %1,0,%4 \n\
|
|
bne 1b"
|
|
SMP_MB
|
|
: "=&r" (old), "=&r" (t), "=m" (*p)
|
|
: "r" (mask), "r" (p), "m" (*p)
|
|
: "cc", "memory");
|
|
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
/*
|
|
* non-atomic version
|
|
*/
|
|
static __inline__ int __test_and_change_bit(int nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long mask = 1 << (nr & 0x1f);
|
|
unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
|
|
unsigned long old = *p;
|
|
|
|
*p = old ^ mask;
|
|
return (old & mask) != 0;
|
|
}
|
|
|
|
static __inline__ int test_bit(int nr, __const__ volatile unsigned long *addr)
|
|
{
|
|
return ((addr[nr >> 5] >> (nr & 0x1f)) & 1) != 0;
|
|
}
|
|
|
|
/* Return the bit position of the most significant 1 bit in a word */
|
|
static __inline__ int __ilog2(unsigned long x)
|
|
{
|
|
int lz;
|
|
|
|
asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
|
|
return 31 - lz;
|
|
}
|
|
|
|
static __inline__ int ffz(unsigned long x)
|
|
{
|
|
if ((x = ~x) == 0)
|
|
return 32;
|
|
return __ilog2(x & -x);
|
|
}
|
|
|
|
static inline int __ffs(unsigned long x)
|
|
{
|
|
return __ilog2(x & -x);
|
|
}
|
|
|
|
/*
|
|
* ffs: find first bit set. This is defined the same way as
|
|
* the libc and compiler builtin ffs routines, therefore
|
|
* differs in spirit from the above ffz (man ffs).
|
|
*/
|
|
static __inline__ int ffs(int x)
|
|
{
|
|
return __ilog2(x & -x) + 1;
|
|
}
|
|
|
|
/*
|
|
* fls: find last (most-significant) bit set.
|
|
* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
|
|
*/
|
|
static __inline__ int fls(unsigned int x)
|
|
{
|
|
int lz;
|
|
|
|
asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
|
|
return 32 - lz;
|
|
}
|
|
|
|
/*
|
|
* hweightN: returns the hamming weight (i.e. the number
|
|
* of bits set) of a N-bit word
|
|
*/
|
|
|
|
#define hweight32(x) generic_hweight32(x)
|
|
#define hweight16(x) generic_hweight16(x)
|
|
#define hweight8(x) generic_hweight8(x)
|
|
|
|
/*
|
|
* Find the first bit set in a 140-bit bitmap.
|
|
* The first 100 bits are unlikely to be set.
|
|
*/
|
|
static inline int sched_find_first_bit(const unsigned long *b)
|
|
{
|
|
if (unlikely(b[0]))
|
|
return __ffs(b[0]);
|
|
if (unlikely(b[1]))
|
|
return __ffs(b[1]) + 32;
|
|
if (unlikely(b[2]))
|
|
return __ffs(b[2]) + 64;
|
|
if (b[3])
|
|
return __ffs(b[3]) + 96;
|
|
return __ffs(b[4]) + 128;
|
|
}
|
|
|
|
/**
|
|
* find_next_bit - find the next set bit in a memory region
|
|
* @addr: The address to base the search on
|
|
* @offset: The bitnumber to start searching at
|
|
* @size: The maximum size to search
|
|
*/
|
|
static __inline__ unsigned long find_next_bit(const unsigned long *addr,
|
|
unsigned long size, unsigned long offset)
|
|
{
|
|
unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
|
|
unsigned int result = offset & ~31UL;
|
|
unsigned int tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= 31UL;
|
|
if (offset) {
|
|
tmp = *p++;
|
|
tmp &= ~0UL << offset;
|
|
if (size < 32)
|
|
goto found_first;
|
|
if (tmp)
|
|
goto found_middle;
|
|
size -= 32;
|
|
result += 32;
|
|
}
|
|
while (size >= 32) {
|
|
if ((tmp = *p++) != 0)
|
|
goto found_middle;
|
|
result += 32;
|
|
size -= 32;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = *p;
|
|
|
|
found_first:
|
|
tmp &= ~0UL >> (32 - size);
|
|
if (tmp == 0UL) /* Are any bits set? */
|
|
return result + size; /* Nope. */
|
|
found_middle:
|
|
return result + __ffs(tmp);
|
|
}
|
|
|
|
/**
|
|
* find_first_bit - find the first set bit in a memory region
|
|
* @addr: The address to start the search at
|
|
* @size: The maximum size to search
|
|
*
|
|
* Returns the bit-number of the first set bit, not the number of the byte
|
|
* containing a bit.
|
|
*/
|
|
#define find_first_bit(addr, size) \
|
|
find_next_bit((addr), (size), 0)
|
|
|
|
/*
|
|
* This implementation of find_{first,next}_zero_bit was stolen from
|
|
* Linus' asm-alpha/bitops.h.
|
|
*/
|
|
#define find_first_zero_bit(addr, size) \
|
|
find_next_zero_bit((addr), (size), 0)
|
|
|
|
static __inline__ unsigned long find_next_zero_bit(const unsigned long *addr,
|
|
unsigned long size, unsigned long offset)
|
|
{
|
|
unsigned int * p = ((unsigned int *) addr) + (offset >> 5);
|
|
unsigned int result = offset & ~31UL;
|
|
unsigned int tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= 31UL;
|
|
if (offset) {
|
|
tmp = *p++;
|
|
tmp |= ~0UL >> (32-offset);
|
|
if (size < 32)
|
|
goto found_first;
|
|
if (tmp != ~0U)
|
|
goto found_middle;
|
|
size -= 32;
|
|
result += 32;
|
|
}
|
|
while (size >= 32) {
|
|
if ((tmp = *p++) != ~0U)
|
|
goto found_middle;
|
|
result += 32;
|
|
size -= 32;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = *p;
|
|
found_first:
|
|
tmp |= ~0UL << size;
|
|
if (tmp == ~0UL) /* Are any bits zero? */
|
|
return result + size; /* Nope. */
|
|
found_middle:
|
|
return result + ffz(tmp);
|
|
}
|
|
|
|
|
|
#define ext2_set_bit(nr, addr) __test_and_set_bit((nr) ^ 0x18, (unsigned long *)(addr))
|
|
#define ext2_set_bit_atomic(lock, nr, addr) test_and_set_bit((nr) ^ 0x18, (unsigned long *)(addr))
|
|
#define ext2_clear_bit(nr, addr) __test_and_clear_bit((nr) ^ 0x18, (unsigned long *)(addr))
|
|
#define ext2_clear_bit_atomic(lock, nr, addr) test_and_clear_bit((nr) ^ 0x18, (unsigned long *)(addr))
|
|
|
|
static __inline__ int ext2_test_bit(int nr, __const__ void * addr)
|
|
{
|
|
__const__ unsigned char *ADDR = (__const__ unsigned char *) addr;
|
|
|
|
return (ADDR[nr >> 3] >> (nr & 7)) & 1;
|
|
}
|
|
|
|
/*
|
|
* This implementation of ext2_find_{first,next}_zero_bit was stolen from
|
|
* Linus' asm-alpha/bitops.h and modified for a big-endian machine.
|
|
*/
|
|
|
|
#define ext2_find_first_zero_bit(addr, size) \
|
|
ext2_find_next_zero_bit((addr), (size), 0)
|
|
|
|
static __inline__ unsigned long ext2_find_next_zero_bit(const void *addr,
|
|
unsigned long size, unsigned long offset)
|
|
{
|
|
unsigned int *p = ((unsigned int *) addr) + (offset >> 5);
|
|
unsigned int result = offset & ~31UL;
|
|
unsigned int tmp;
|
|
|
|
if (offset >= size)
|
|
return size;
|
|
size -= result;
|
|
offset &= 31UL;
|
|
if (offset) {
|
|
tmp = cpu_to_le32p(p++);
|
|
tmp |= ~0UL >> (32-offset);
|
|
if (size < 32)
|
|
goto found_first;
|
|
if (tmp != ~0U)
|
|
goto found_middle;
|
|
size -= 32;
|
|
result += 32;
|
|
}
|
|
while (size >= 32) {
|
|
if ((tmp = cpu_to_le32p(p++)) != ~0U)
|
|
goto found_middle;
|
|
result += 32;
|
|
size -= 32;
|
|
}
|
|
if (!size)
|
|
return result;
|
|
tmp = cpu_to_le32p(p);
|
|
found_first:
|
|
tmp |= ~0U << size;
|
|
if (tmp == ~0UL) /* Are any bits zero? */
|
|
return result + size; /* Nope. */
|
|
found_middle:
|
|
return result + ffz(tmp);
|
|
}
|
|
|
|
/* Bitmap functions for the minix filesystem. */
|
|
#define minix_test_and_set_bit(nr,addr) ext2_set_bit(nr,addr)
|
|
#define minix_set_bit(nr,addr) ((void)ext2_set_bit(nr,addr))
|
|
#define minix_test_and_clear_bit(nr,addr) ext2_clear_bit(nr,addr)
|
|
#define minix_test_bit(nr,addr) ext2_test_bit(nr,addr)
|
|
#define minix_find_first_zero_bit(addr,size) ext2_find_first_zero_bit(addr,size)
|
|
|
|
#endif /* _PPC_BITOPS_H */
|
|
#endif /* __KERNEL__ */
|