diff options
Diffstat (limited to 'arch/sparc/lib/atomic.S')
| -rw-r--r-- | arch/sparc/lib/atomic.S | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/arch/sparc/lib/atomic.S b/arch/sparc/lib/atomic.S new file mode 100644 index 000000000000..f48ad0c4dadb --- /dev/null +++ b/arch/sparc/lib/atomic.S | |||
| @@ -0,0 +1,100 @@ | |||
| 1 | /* atomic.S: Move this stuff here for better ICACHE hit rates. | ||
| 2 | * | ||
| 3 | * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu) | ||
| 4 | */ | ||
| 5 | |||
| 6 | #include <linux/config.h> | ||
| 7 | #include <asm/ptrace.h> | ||
| 8 | #include <asm/psr.h> | ||
| 9 | |||
| 10 | .text | ||
| 11 | .align 4 | ||
| 12 | |||
| 13 | .globl __atomic_begin | ||
| 14 | __atomic_begin: | ||
| 15 | |||
| 16 | #ifndef CONFIG_SMP | ||
| 17 | .globl ___xchg32_sun4c | ||
| 18 | ___xchg32_sun4c: | ||
| 19 | rd %psr, %g3 | ||
| 20 | andcc %g3, PSR_PIL, %g0 | ||
| 21 | bne 1f | ||
| 22 | nop | ||
| 23 | wr %g3, PSR_PIL, %psr | ||
| 24 | nop; nop; nop | ||
| 25 | 1: | ||
| 26 | andcc %g3, PSR_PIL, %g0 | ||
| 27 | ld [%g1], %g7 | ||
| 28 | bne 1f | ||
| 29 | st %g2, [%g1] | ||
| 30 | wr %g3, 0x0, %psr | ||
| 31 | nop; nop; nop | ||
| 32 | 1: | ||
| 33 | mov %g7, %g2 | ||
| 34 | jmpl %o7 + 8, %g0 | ||
| 35 | mov %g4, %o7 | ||
| 36 | |||
| 37 | .globl ___xchg32_sun4md | ||
| 38 | ___xchg32_sun4md: | ||
| 39 | swap [%g1], %g2 | ||
| 40 | jmpl %o7 + 8, %g0 | ||
| 41 | mov %g4, %o7 | ||
| 42 | #endif | ||
| 43 | |||
| 44 | /* Read asm-sparc/atomic.h carefully to understand how this works for SMP. | ||
| 45 | * Really, some things here for SMP are overly clever, go read the header. | ||
| 46 | */ | ||
| 47 | .globl ___atomic24_add | ||
| 48 | ___atomic24_add: | ||
| 49 | rd %psr, %g3 ! Keep the code small, old way was stupid | ||
| 50 | nop; nop; nop; ! Let the bits set | ||
| 51 | or %g3, PSR_PIL, %g7 ! Disable interrupts | ||
| 52 | wr %g7, 0x0, %psr ! Set %psr | ||
| 53 | nop; nop; nop; ! Let the bits set | ||
| 54 | #ifdef CONFIG_SMP | ||
| 55 | 1: ldstub [%g1 + 3], %g7 ! Spin on the byte lock for SMP. | ||
| 56 | orcc %g7, 0x0, %g0 ! Did we get it? | ||
| 57 | bne 1b ! Nope... | ||
| 58 | ld [%g1], %g7 ! Load locked atomic24_t | ||
| 59 | sra %g7, 8, %g7 ! Get signed 24-bit integer | ||
| 60 | add %g7, %g2, %g2 ! Add in argument | ||
| 61 | sll %g2, 8, %g7 ! Transpose back to atomic24_t | ||
| 62 | st %g7, [%g1] ! Clever: This releases the lock as well. | ||
| 63 | #else | ||
| 64 | ld [%g1], %g7 ! Load locked atomic24_t | ||
| 65 | add %g7, %g2, %g2 ! Add in argument | ||
| 66 | st %g2, [%g1] ! Store it back | ||
| 67 | #endif | ||
| 68 | wr %g3, 0x0, %psr ! Restore original PSR_PIL | ||
| 69 | nop; nop; nop; ! Let the bits set | ||
| 70 | jmpl %o7, %g0 ! NOTE: not + 8, see callers in atomic.h | ||
| 71 | mov %g4, %o7 ! Restore %o7 | ||
| 72 | |||
| 73 | .globl ___atomic24_sub | ||
| 74 | ___atomic24_sub: | ||
| 75 | rd %psr, %g3 ! Keep the code small, old way was stupid | ||
| 76 | nop; nop; nop; ! Let the bits set | ||
| 77 | or %g3, PSR_PIL, %g7 ! Disable interrupts | ||
| 78 | wr %g7, 0x0, %psr ! Set %psr | ||
| 79 | nop; nop; nop; ! Let the bits set | ||
| 80 | #ifdef CONFIG_SMP | ||
| 81 | 1: ldstub [%g1 + 3], %g7 ! Spin on the byte lock for SMP. | ||
| 82 | orcc %g7, 0x0, %g0 ! Did we get it? | ||
| 83 | bne 1b ! Nope... | ||
| 84 | ld [%g1], %g7 ! Load locked atomic24_t | ||
| 85 | sra %g7, 8, %g7 ! Get signed 24-bit integer | ||
| 86 | sub %g7, %g2, %g2 ! Subtract argument | ||
| 87 | sll %g2, 8, %g7 ! Transpose back to atomic24_t | ||
| 88 | st %g7, [%g1] ! Clever: This releases the lock as well | ||
| 89 | #else | ||
| 90 | ld [%g1], %g7 ! Load locked atomic24_t | ||
| 91 | sub %g7, %g2, %g2 ! Subtract argument | ||
| 92 | st %g2, [%g1] ! Store it back | ||
| 93 | #endif | ||
| 94 | wr %g3, 0x0, %psr ! Restore original PSR_PIL | ||
| 95 | nop; nop; nop; ! Let the bits set | ||
| 96 | jmpl %o7, %g0 ! NOTE: not + 8, see callers in atomic.h | ||
| 97 | mov %g4, %o7 ! Restore %o7 | ||
| 98 | |||
| 99 | .globl __atomic_end | ||
| 100 | __atomic_end: | ||