b4d909d415
This patch separates the character and block driver communication protocols. The old character protocol remains the same, but a new block protocol is introduced. The libdriver library is replaced by two new libraries: libchardriver and libblockdriver. Their exposed API, and drivers that use them, have been updated accordingly. Together, libbdev and libblockdriver now completely abstract away the message format used by the block protocol. As the memory driver is both a character and a block device driver, it now implements its own message loop. The most important semantic change made to the block protocol is that it is no longer possible to return both partial results and an error for a single transfer. This simplifies the interaction between the caller and the driver, as the I/O vector no longer needs to be copied back. Also, drivers are now no longer supposed to decide based on the layout of the I/O vector when a transfer should be cut short. Put simply, transfers are now supposed to either succeed completely, or result in an error. After this patch, the state of the various pieces is as follows: - block protocol: stable - libbdev API: stable for synchronous communication - libblockdriver API: needs slight revision (the drvlib/partition API in particular; the threading API will also change shortly) - character protocol: needs cleanup - libchardriver API: needs cleanup accordingly - driver restarts: largely unsupported until endpoint changes are reintroduced As a side effect, this patch eliminates several bugs, hacks, and gcc -Wall and -W warnings all over the place. It probably introduces a few new ones, too. Update warning: this patch changes the protocol between MFS and disk drivers, so in order to use old/new images, the MFS from the ramdisk must be used to mount all file systems.
91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
#ifndef AUDIO_FW_H
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#define AUDIO_FW_H
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#include <minix/drivers.h>
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#include <minix/chardriver.h>
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#include <sys/ioc_sound.h>
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_PROTOTYPE( int drv_init, (void) );
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_PROTOTYPE( int drv_init_hw, (void) );
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_PROTOTYPE( int drv_reset, (void) );
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_PROTOTYPE( int drv_start, (int sub_dev, int DmaMode) );
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_PROTOTYPE( int drv_stop, (int sub_dev) );
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_PROTOTYPE( int drv_set_dma, (u32_t dma, u32_t length, int chan) );
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_PROTOTYPE( int drv_reenable_int, (int chan) );
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_PROTOTYPE( int drv_int_sum, (void) );
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_PROTOTYPE( int drv_int, (int sub_dev) );
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_PROTOTYPE( int drv_pause, (int chan) );
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_PROTOTYPE( int drv_resume, (int chan) );
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_PROTOTYPE( int drv_io_ctl, (int request, void * val, int * len, int sub_dev) );
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_PROTOTYPE( int drv_get_irq, (char *irq) );
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_PROTOTYPE( int drv_get_frag_size, (u32_t *frag_size, int sub_dev) );
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/* runtime status fields */
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typedef struct {
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int readable;
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int writable;
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int DmaSize;
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int NrOfDmaFragments;
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int MinFragmentSize;
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int NrOfExtraBuffers;
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int Nr; /* sub device number */
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int Opened; /* sub device opened */
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int DmaBusy; /* is dma busy? */
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int DmaMode; /* DEV_WRITE / DEV_READ */
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int DmaReadNext; /* current dma buffer */
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int DmaFillNext; /* next dma buffer to fill */
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int DmaLength;
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int BufReadNext; /* start of extra circular buffer */
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int BufFillNext; /* end of extra circular buffer */
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int BufLength;
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int RevivePending; /* process waiting for this dev? */
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int ReviveStatus; /* return val when proc unblocked */
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endpoint_t ReviveProcNr; /* the process to unblock */
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cp_grant_id_t ReviveGrant; /* grant id associated with io */
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void *UserBuf; /* address of user's data buffer */
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int ReadyToRevive; /* are we ready to revive process?*/
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endpoint_t SourceProcNr; /* process to send notify to (FS) */
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u32_t FragSize; /* dma fragment size */
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char *DmaBuf; /* the dma buffer; extra space for
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page alignment */
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phys_bytes DmaPhys; /* physical address of dma buffer */
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char* DmaPtr; /* pointer to aligned dma buffer */
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int OutOfData; /* all buffers empty? */
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char *ExtraBuf; /* don't use extra buffer;just
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declare a pointer to supress
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error messages */
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} sub_dev_t;
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typedef struct {
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int minor_dev_nr;
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int read_chan;
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int write_chan;
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int io_ctl;
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} special_file_t;
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typedef struct {
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char* DriverName;
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int NrOfSubDevices;
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int NrOfSpecialFiles;
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} drv_t;
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EXTERN drv_t drv;
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EXTERN sub_dev_t sub_dev[];
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EXTERN special_file_t special_file[];
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/* Number of bytes you can DMA before hitting a 64K boundary: */
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#define dma_bytes_left(phys) \
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((unsigned) (sizeof(int) == 2 ? 0 : 0x10000) - (unsigned) ((phys) & 0xFFFF))
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#define NO_CHANNEL -1
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#define TRUE 1
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#define FALSE 0
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#define NO_DMA 0
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#endif /* AUDIO_FW_H */
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