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Diffstat (limited to 'include/asm-s390x/idals.h')
| -rw-r--r-- | include/asm-s390x/idals.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/include/asm-s390x/idals.h b/include/asm-s390x/idals.h new file mode 100644 index 000000000..277489692 --- /dev/null +++ b/include/asm-s390x/idals.h @@ -0,0 +1,57 @@ +/* + * File...........: linux/include/asm-s390x/idals.h + * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> + * Bugreports.to..: <Linux390@de.ibm.com> + * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000a + + * History of changes + * 07/24/00 new file + */ +#include <linux/config.h> +#include <asm/irq.h> + +typedef unsigned long idaw_t; + +static inline idaw_t * +idal_alloc ( int nridaws ) +{ + if ( nridaws > 33 ) + BUG(); + return kmalloc(nridaws * sizeof(idaw_t), GFP_ATOMIC | GFP_DMA ); +} + +static inline void +idal_free ( idaw_t *idal ) +{ + kfree (idal); +} + +/* + * Function: set_normalized_cda + * sets the address of the data in CCW + * if necessary it allocates an IDAL and sets sthe appropriate flags + */ +#if defined (CONFIG_ARCH_S390X) +extern void set_normalized_cda(ccw1_t * ccw, unsigned long address); +#else +static inline void +set_normalized_cda(ccw1_t * ccw, unsigned long address) +{ + ccw->cda = address; +} +#endif + +/* + * Function: clear_normalized_cda + * releases any allocated IDAL related to the CCW + */ +static inline void +clear_normalized_cda ( ccw1_t * ccw ) +{ + if ( ccw -> flags & CCW_FLAG_IDA ) { + idal_free ( (idaw_t *)(unsigned long) (ccw -> cda )); + ccw -> flags &= ~CCW_FLAG_IDA; + } + ccw -> cda = 0; +} + |