1efe4ce3ca
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>
169 lines
6.1 KiB
C
169 lines
6.1 KiB
C
#ifndef __ASM_SH_BITOPS_GRB_H
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#define __ASM_SH_BITOPS_GRB_H
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static inline void set_bit(int nr, volatile void * addr)
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{
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int mask;
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volatile unsigned int *a = addr;
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unsigned long tmp;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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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" (a)
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: "r" (mask)
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: "memory" , "r0", "r1");
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}
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static inline void clear_bit(int nr, volatile void * addr)
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{
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int mask;
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volatile unsigned int *a = addr;
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unsigned long tmp;
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a += nr >> 5;
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mask = ~(1 << (nr & 0x1f));
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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" /* and */
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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" (a)
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: "r" (mask)
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: "memory" , "r0", "r1");
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}
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static inline void change_bit(int nr, volatile void * addr)
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{
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int mask;
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volatile unsigned int *a = addr;
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unsigned long tmp;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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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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" xor %2, %0 \n\t" /* xor */
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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" (a)
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: "r" (mask)
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: "memory" , "r0", "r1");
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}
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static inline int test_and_set_bit(int nr, volatile void * addr)
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{
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int mask, retval;
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volatile unsigned int *a = addr;
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unsigned long tmp;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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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 #-14, r15 \n\t" /* LOGIN: r15 = size */
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" mov.l @%2, %0 \n\t" /* load old value */
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" mov %0, %1 \n\t"
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" tst %1, %3 \n\t" /* T = ((*a & mask) == 0) */
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" mov #-1, %1 \n\t" /* retvat = -1 */
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" negc %1, %1 \n\t" /* retval = (mask & *a) != 0 */
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" or %3, %0 \n\t"
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" mov.l %0, @%2 \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" (retval),
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"+r" (a)
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: "r" (mask)
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: "memory" , "r0", "r1" ,"t");
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return retval;
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}
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static inline int test_and_clear_bit(int nr, volatile void * addr)
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{
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int mask, retval,not_mask;
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volatile unsigned int *a = addr;
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unsigned long tmp;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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not_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 #-14, r15 \n\t" /* LOGIN */
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" mov.l @%2, %0 \n\t" /* load old value */
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" mov %0, %1 \n\t" /* %1 = *a */
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" tst %1, %3 \n\t" /* T = ((*a & mask) == 0) */
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" mov #-1, %1 \n\t" /* retvat = -1 */
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" negc %1, %1 \n\t" /* retval = (mask & *a) != 0 */
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" and %4, %0 \n\t"
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" mov.l %0, @%2 \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" (retval),
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"+r" (a)
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: "r" (mask),
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"r" (not_mask)
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: "memory" , "r0", "r1", "t");
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return retval;
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}
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static inline int test_and_change_bit(int nr, volatile void * addr)
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{
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int mask, retval;
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volatile unsigned int *a = addr;
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unsigned long tmp;
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a += nr >> 5;
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mask = 1 << (nr & 0x1f);
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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 #-14, r15 \n\t" /* LOGIN */
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" mov.l @%2, %0 \n\t" /* load old value */
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" mov %0, %1 \n\t" /* %1 = *a */
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" tst %1, %3 \n\t" /* T = ((*a & mask) == 0) */
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" mov #-1, %1 \n\t" /* retvat = -1 */
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" negc %1, %1 \n\t" /* retval = (mask & *a) != 0 */
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" xor %3, %0 \n\t"
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" mov.l %0, @%2 \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" (retval),
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"+r" (a)
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: "r" (mask)
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: "memory" , "r0", "r1", "t");
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return retval;
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}
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#endif /* __ASM_SH_BITOPS_GRB_H */
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