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Use separate data-in and data-out buffers.

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Increase code simplicity at the expense of around 64 bytes.
This commit is contained in:
Michael Brown
2006-05-28 23:26:42 +00:00
parent 6d6252067f
commit 6f998cecb3
2 changed files with 72 additions and 74 deletions
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66
src/include/gpxe/ata.h
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@@ -56,9 +56,9 @@ union ata_lba {
uint8_t low_prev;
uint8_t mid_prev;
uint8_t high_prev;
uint8_t pad[2];
uint16_t pad;
#elif __BYTE_ORDER == __BIG_ENDIAN
uint8_t pad[2];
uint16_t pad;
uint8_t high_prev;
uint8_t mid_prev;
uint8_t low_prev;
@@ -101,52 +101,55 @@ struct ata_cb {
uint8_t device;
/** Command/status register */
uint8_t cmd_stat;
/** Flags
*
* This field does not correspond to any ATA register.
*/
uint8_t flags;
/** LBA48 addressing flag */
int lba48;
};
/** LBA48 extended addressing */
#define ATA_FL_LBA48 0x40
/** Device 1 ("slave") */
#define ATA_FL_SLAVE 0x10
/** Write command */
#define ATA_FL_WRITE 0x01
/** Obsolete bits in the ATA device register */
#define ATA_DEV_OBSOLETE 0xa0
/** LBA flag in the ATA device register */
#define ATA_DEV_LBA 0x40
/** Slave ("device 1") flag in the ATA device register */
#define ATA_DEV_SLAVE 0x10
/** Master ("device 0") flag in the ATA device register */
#define ATA_DEV_MASTER 0x00
/** "Read sectors" command */
#define ATA_CMD_READ 0x20
/** "Read sectors (ext)" command */
#define ATA_CMD_READ_EXT 0x24
/** "Write sectors" command */
#define ATA_CMD_WRITE 0x30
/** "Write sectors (ext)" command */
#define ATA_CMD_WRITE_EXT 0x34
/** "Identify" command */
#define ATA_CMD_IDENTIFY 0xec
/** "Extended (LBA48)" command modifier
*
* This doesn't apply to all ATA commands, but it does for @c
* ATA_CMD_READ and @c ATA_CMD_WRITE.
*/
#define ATA_CMD_EXT 0x04
/** An ATA command */
struct ata_command {
/** ATA command block */
struct ata_cb cb;
/** Data buffer */
userptr_t data;
/** Data buffer length */
size_t data_len;
/** Data-out buffer (may be NULL) */
userptr_t data_out;
/** Data-out buffer length
*
* Must be zero if @c data_out is NULL
*/
size_t data_out_len;
/** Data-in buffer (may be NULL) */
userptr_t data_in;
/** Data-in buffer length
*
* Must be zero if @c data_in is NULL
*/
size_t data_in_len;
};
/**
@@ -175,8 +178,13 @@ struct ata_identity {
struct ata_device {
/** Block device interface */
struct block_device blockdev;
/** Flags */
int flags;
/** Device number
*
* Must be ATA_DEV_MASTER or ATA_DEV_SLAVE.
*/
int device;
/** LBA48 extended addressing */
int lba48;
/**
* Issue ATA command
*