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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>
170 lines
4.5 KiB
C
170 lines
4.5 KiB
C
#ifndef __ASM_SH_ATOMIC_GRB_H
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#define __ASM_SH_ATOMIC_GRB_H
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static inline void atomic_add(int i, atomic_t *v)
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{
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int tmp;
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__asm__ __volatile__ (
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" .align 2 \n\t"
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" mova 1f, r0 \n\t" /* r0 = end point */
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" mov r15, r1 \n\t" /* r1 = saved sp */
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" mov #-6, r15 \n\t" /* LOGIN: r15 = size */
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" mov.l @%1, %0 \n\t" /* load old value */
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" add %2, %0 \n\t" /* add */
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" mov.l %0, @%1 \n\t" /* store new value */
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"1: mov r1, r15 \n\t" /* LOGOUT */
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: "=&r" (tmp),
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"+r" (v)
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: "r" (i)
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: "memory" , "r0", "r1");
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}
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static inline void atomic_sub(int i, atomic_t *v)
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{
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int tmp;
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__asm__ __volatile__ (
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" .align 2 \n\t"
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" mova 1f, r0 \n\t" /* r0 = end point */
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" mov r15, r1 \n\t" /* r1 = saved sp */
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" mov #-6, r15 \n\t" /* LOGIN: r15 = size */
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" mov.l @%1, %0 \n\t" /* load old value */
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" sub %2, %0 \n\t" /* sub */
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" mov.l %0, @%1 \n\t" /* store new value */
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"1: mov r1, r15 \n\t" /* LOGOUT */
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: "=&r" (tmp),
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"+r" (v)
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: "r" (i)
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: "memory" , "r0", "r1");
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}
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static inline int atomic_add_return(int i, atomic_t *v)
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{
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int tmp;
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__asm__ __volatile__ (
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" .align 2 \n\t"
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" mova 1f, r0 \n\t" /* r0 = end point */
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" mov r15, r1 \n\t" /* r1 = saved sp */
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" mov #-6, r15 \n\t" /* LOGIN: r15 = size */
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" mov.l @%1, %0 \n\t" /* load old value */
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" add %2, %0 \n\t" /* add */
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" mov.l %0, @%1 \n\t" /* store new value */
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"1: mov r1, r15 \n\t" /* LOGOUT */
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: "=&r" (tmp),
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"+r" (v)
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: "r" (i)
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: "memory" , "r0", "r1");
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return tmp;
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}
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static inline int atomic_sub_return(int i, atomic_t *v)
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{
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int tmp;
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__asm__ __volatile__ (
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" .align 2 \n\t"
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" mova 1f, r0 \n\t" /* r0 = end point */
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" mov r15, r1 \n\t" /* r1 = saved sp */
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" mov #-6, r15 \n\t" /* LOGIN: r15 = size */
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" mov.l @%1, %0 \n\t" /* load old value */
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" sub %2, %0 \n\t" /* sub */
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" mov.l %0, @%1 \n\t" /* store new value */
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"1: mov r1, r15 \n\t" /* LOGOUT */
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: "=&r" (tmp),
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"+r" (v)
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: "r" (i)
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: "memory", "r0", "r1");
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return tmp;
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}
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static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
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{
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int tmp;
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unsigned int _mask = ~mask;
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__asm__ __volatile__ (
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" .align 2 \n\t"
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" mova 1f, r0 \n\t" /* r0 = end point */
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" mov r15, r1 \n\t" /* r1 = saved sp */
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" mov #-6, r15 \n\t" /* LOGIN: r15 = size */
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" mov.l @%1, %0 \n\t" /* load old value */
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" and %2, %0 \n\t" /* add */
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" mov.l %0, @%1 \n\t" /* store new value */
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"1: mov r1, r15 \n\t" /* LOGOUT */
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: "=&r" (tmp),
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"+r" (v)
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: "r" (_mask)
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: "memory" , "r0", "r1");
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}
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static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
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{
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int tmp;
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__asm__ __volatile__ (
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" .align 2 \n\t"
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" mova 1f, r0 \n\t" /* r0 = end point */
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" mov r15, r1 \n\t" /* r1 = saved sp */
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" mov #-6, r15 \n\t" /* LOGIN: r15 = size */
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" mov.l @%1, %0 \n\t" /* load old value */
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" or %2, %0 \n\t" /* or */
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" mov.l %0, @%1 \n\t" /* store new value */
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"1: mov r1, r15 \n\t" /* LOGOUT */
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: "=&r" (tmp),
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"+r" (v)
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: "r" (mask)
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: "memory" , "r0", "r1");
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}
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static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
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{
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int ret;
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__asm__ __volatile__ (
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" .align 2 \n\t"
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" mova 1f, r0 \n\t"
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" nop \n\t"
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" mov r15, r1 \n\t"
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" mov #-8, r15 \n\t"
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" mov.l @%1, %0 \n\t"
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" cmp/eq %2, %0 \n\t"
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" bf 1f \n\t"
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" mov.l %3, @%1 \n\t"
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"1: mov r1, r15 \n\t"
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: "=&r" (ret)
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: "r" (v), "r" (old), "r" (new)
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: "memory" , "r0", "r1" , "t");
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return ret;
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}
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static inline int atomic_add_unless(atomic_t *v, int a, int u)
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{
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int ret;
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unsigned long tmp;
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__asm__ __volatile__ (
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" .align 2 \n\t"
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" mova 1f, r0 \n\t"
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" nop \n\t"
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" mov r15, r1 \n\t"
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" mov #-12, r15 \n\t"
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" mov.l @%2, %1 \n\t"
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" mov %1, %0 \n\t"
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" cmp/eq %4, %0 \n\t"
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" bt/s 1f \n\t"
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" add %3, %1 \n\t"
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" mov.l %1, @%2 \n\t"
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"1: mov r1, r15 \n\t"
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: "=&r" (ret), "=&r" (tmp)
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: "r" (v), "r" (a), "r" (u)
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: "memory" , "r0", "r1" , "t");
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return ret != u;
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}
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#endif /* __ASM_SH_ATOMIC_GRB_H */
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