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This implements kernel-level atomic rollback built on top of gUSA, as an alternative non-IRQ based atomicity method. This is generally a faster method for platforms that are lacking the LL/SC pairs that SH-4A and later use, and is only supportable on legacy cores. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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Stuart Menefy
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| #ifndef __ASM_SH_ATOMIC_GRB_H | ||
| #define __ASM_SH_ATOMIC_GRB_H | ||
|
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| static inline void atomic_add(int i, atomic_t *v) | ||
| { | ||
| int tmp; | ||
|
|
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| __asm__ __volatile__ ( | ||
| " .align 2 \n\t" | ||
| " mova 1f, r0 \n\t" /* r0 = end point */ | ||
| " mov r15, r1 \n\t" /* r1 = saved sp */ | ||
| " mov #-6, r15 \n\t" /* LOGIN: r15 = size */ | ||
| " mov.l @%1, %0 \n\t" /* load old value */ | ||
| " add %2, %0 \n\t" /* add */ | ||
| " mov.l %0, @%1 \n\t" /* store new value */ | ||
| "1: mov r1, r15 \n\t" /* LOGOUT */ | ||
| : "=&r" (tmp), | ||
| "+r" (v) | ||
| : "r" (i) | ||
| : "memory" , "r0", "r1"); | ||
| } | ||
|
|
||
| static inline void atomic_sub(int i, atomic_t *v) | ||
| { | ||
| int tmp; | ||
|
|
||
| __asm__ __volatile__ ( | ||
| " .align 2 \n\t" | ||
| " mova 1f, r0 \n\t" /* r0 = end point */ | ||
| " mov r15, r1 \n\t" /* r1 = saved sp */ | ||
| " mov #-6, r15 \n\t" /* LOGIN: r15 = size */ | ||
| " mov.l @%1, %0 \n\t" /* load old value */ | ||
| " sub %2, %0 \n\t" /* sub */ | ||
| " mov.l %0, @%1 \n\t" /* store new value */ | ||
| "1: mov r1, r15 \n\t" /* LOGOUT */ | ||
| : "=&r" (tmp), | ||
| "+r" (v) | ||
| : "r" (i) | ||
| : "memory" , "r0", "r1"); | ||
| } | ||
|
|
||
| static inline int atomic_add_return(int i, atomic_t *v) | ||
| { | ||
| int tmp; | ||
|
|
||
| __asm__ __volatile__ ( | ||
| " .align 2 \n\t" | ||
| " mova 1f, r0 \n\t" /* r0 = end point */ | ||
| " mov r15, r1 \n\t" /* r1 = saved sp */ | ||
| " mov #-6, r15 \n\t" /* LOGIN: r15 = size */ | ||
| " mov.l @%1, %0 \n\t" /* load old value */ | ||
| " add %2, %0 \n\t" /* add */ | ||
| " mov.l %0, @%1 \n\t" /* store new value */ | ||
| "1: mov r1, r15 \n\t" /* LOGOUT */ | ||
| : "=&r" (tmp), | ||
| "+r" (v) | ||
| : "r" (i) | ||
| : "memory" , "r0", "r1"); | ||
|
|
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| return tmp; | ||
| } | ||
|
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| static inline int atomic_sub_return(int i, atomic_t *v) | ||
| { | ||
| int tmp; | ||
|
|
||
| __asm__ __volatile__ ( | ||
| " .align 2 \n\t" | ||
| " mova 1f, r0 \n\t" /* r0 = end point */ | ||
| " mov r15, r1 \n\t" /* r1 = saved sp */ | ||
| " mov #-6, r15 \n\t" /* LOGIN: r15 = size */ | ||
| " mov.l @%1, %0 \n\t" /* load old value */ | ||
| " sub %2, %0 \n\t" /* sub */ | ||
| " mov.l %0, @%1 \n\t" /* store new value */ | ||
| "1: mov r1, r15 \n\t" /* LOGOUT */ | ||
| : "=&r" (tmp), | ||
| "+r" (v) | ||
| : "r" (i) | ||
| : "memory", "r0", "r1"); | ||
|
|
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| return tmp; | ||
| } | ||
|
|
||
| static inline void atomic_clear_mask(unsigned int mask, atomic_t *v) | ||
| { | ||
| int tmp; | ||
| unsigned int _mask = ~mask; | ||
|
|
||
| __asm__ __volatile__ ( | ||
| " .align 2 \n\t" | ||
| " mova 1f, r0 \n\t" /* r0 = end point */ | ||
| " mov r15, r1 \n\t" /* r1 = saved sp */ | ||
| " mov #-6, r15 \n\t" /* LOGIN: r15 = size */ | ||
| " mov.l @%1, %0 \n\t" /* load old value */ | ||
| " and %2, %0 \n\t" /* add */ | ||
| " mov.l %0, @%1 \n\t" /* store new value */ | ||
| "1: mov r1, r15 \n\t" /* LOGOUT */ | ||
| : "=&r" (tmp), | ||
| "+r" (v) | ||
| : "r" (_mask) | ||
| : "memory" , "r0", "r1"); | ||
| } | ||
|
|
||
| static inline void atomic_set_mask(unsigned int mask, atomic_t *v) | ||
| { | ||
| int tmp; | ||
|
|
||
| __asm__ __volatile__ ( | ||
| " .align 2 \n\t" | ||
| " mova 1f, r0 \n\t" /* r0 = end point */ | ||
| " mov r15, r1 \n\t" /* r1 = saved sp */ | ||
| " mov #-6, r15 \n\t" /* LOGIN: r15 = size */ | ||
| " mov.l @%1, %0 \n\t" /* load old value */ | ||
| " or %2, %0 \n\t" /* or */ | ||
| " mov.l %0, @%1 \n\t" /* store new value */ | ||
| "1: mov r1, r15 \n\t" /* LOGOUT */ | ||
| : "=&r" (tmp), | ||
| "+r" (v) | ||
| : "r" (mask) | ||
| : "memory" , "r0", "r1"); | ||
| } | ||
|
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| static inline int atomic_cmpxchg(atomic_t *v, int old, int new) | ||
| { | ||
| int ret; | ||
|
|
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| __asm__ __volatile__ ( | ||
| " .align 2 \n\t" | ||
| " mova 1f, r0 \n\t" | ||
| " nop \n\t" | ||
| " mov r15, r1 \n\t" | ||
| " mov #-8, r15 \n\t" | ||
| " mov.l @%1, %0 \n\t" | ||
| " cmp/eq %2, %0 \n\t" | ||
| " bf 1f \n\t" | ||
| " mov.l %3, @%1 \n\t" | ||
| "1: mov r1, r15 \n\t" | ||
| : "=&r" (ret) | ||
| : "r" (v), "r" (old), "r" (new) | ||
| : "memory" , "r0", "r1" , "t"); | ||
|
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| return ret; | ||
| } | ||
|
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| static inline int atomic_add_unless(atomic_t *v, int a, int u) | ||
| { | ||
| int ret; | ||
| unsigned long tmp; | ||
|
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| __asm__ __volatile__ ( | ||
| " .align 2 \n\t" | ||
| " mova 1f, r0 \n\t" | ||
| " nop \n\t" | ||
| " mov r15, r1 \n\t" | ||
| " mov #-12, r15 \n\t" | ||
| " mov.l @%2, %1 \n\t" | ||
| " mov %1, %0 \n\t" | ||
| " cmp/eq %4, %0 \n\t" | ||
| " bt/s 1f \n\t" | ||
| " add %3, %1 \n\t" | ||
| " mov.l %1, @%2 \n\t" | ||
| "1: mov r1, r15 \n\t" | ||
| : "=&r" (ret), "=&r" (tmp) | ||
| : "r" (v), "r" (a), "r" (u) | ||
| : "memory" , "r0", "r1" , "t"); | ||
|
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| return ret != u; | ||
| } | ||
| #endif /* __ASM_SH_ATOMIC_GRB_H */ |
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