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add a R_PREV_IDX macro

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mjacob 2000-01-18 01:42:11 +00:00
parent e8eebed1f3
commit 7d5f58b26b
1 changed files with 1 additions and 0 deletions
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sys/pci/if_wxvar.h
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@ -314,3 +314,4 @@ typedef struct wx_softc {
#define T_NXT_IDX(x) ((x + 1) & (WX_MAX_TDESC - 1))
#define WX_MAX_RDESC 64 /* number of receive descriptors */
#define R_NXT_IDX(x) ((x + 1) & (WX_MAX_RDESC - 1))
#define R_PREV_IDX(x) ((x - 1) & (WX_MAX_RDESC - 1))