68125bc441
Removed data_in_len and data_out_len from ata_command structure; the lengths are implied by the sector count and the presence of the data_in or data_out pointers. Changed AoE code to use subcommands by default, and made aoe_issue() nonblocking (with completion via async_wait()).
63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
#ifndef _GPXE_ASYNC_H
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#define _GPXE_ASYNC_H
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/** @file
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*
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* Asynchronous operations
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*
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*/
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#include <errno.h>
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#include <assert.h>
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/** An asynchronous operation */
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struct async_operation {
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/** Operation status
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*
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* This is an error code as defined in errno.h, plus an offset
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* of EINPROGRESS. This means that a status value of 0
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* corresponds to a return status code of -EINPROGRESS,
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* i.e. that the default state of an asynchronous operation is
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* "not yet completed".
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*/
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int status;
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};
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/**
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* Set asynchronous operation status
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*
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* @v aop Asynchronous operation
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* @v rc Return status code
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*/
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static inline __attribute__ (( always_inline )) void
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async_set_status ( struct async_operation *aop, int rc ) {
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aop->status = ( rc + EINPROGRESS );
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}
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/**
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* Get asynchronous operation status
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*
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* @v aop Asynchronous operation
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* @ret rc Return status code
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*/
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static inline __attribute__ (( always_inline )) int
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async_status ( struct async_operation *aop ) {
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return ( aop->status - EINPROGRESS );
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}
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/**
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* Flag asynchronous operation as complete
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*
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* @v aop Asynchronous operation
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* @v rc Return status code
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*/
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static inline __attribute__ (( always_inline )) void
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async_done ( struct async_operation *aop, int rc ) {
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assert ( rc != -EINPROGRESS );
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async_set_status ( aop, rc );
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}
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extern int async_wait ( struct async_operation *aop );
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#endif /* _GPXE_ASYNC_H */
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