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Small change to support RWMUL and WRMUL. Now xv6 truly works with a block size

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that is a multiple of the sector size.
This commit is contained in:
Frans Kaashoek 2016-08-18 07:39:03 -04:00
parent 19f65413bd
commit 4a3576b810
1 changed files with 7 additions and 3 deletions
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8
ide.c
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@ -20,6 +20,8 @@
#define IDE_CMD_READ 0x20
#define IDE_CMD_WRITE 0x30
#define IDE_CMD_RDMUL 0xc4
#define IDE_CMD_WRMUL 0xc5
// idequeue points to the buf now being read/written to the disk.
// idequeue->qnext points to the next buf to be processed.
@ -77,6 +79,8 @@ idestart(struct buf *b)
panic("incorrect blockno");
int sector_per_block = BSIZE/SECTOR_SIZE;
int sector = b->blockno * sector_per_block;
int read_cmd = (sector_per_block == 1) ? IDE_CMD_READ : IDE_CMD_RDMUL;
int write_cmd = (sector_per_block == 1) ? IDE_CMD_WRITE : IDE_CMD_WRMUL;
if (sector_per_block > 7) panic("idestart");
@ -88,10 +92,10 @@ idestart(struct buf *b)
outb(0x1f5, (sector >> 16) & 0xff);
outb(0x1f6, 0xe0 | ((b->dev&1)<<4) | ((sector>>24)&0x0f));
if(b->flags & B_DIRTY){
outb(0x1f7, IDE_CMD_WRITE);
outb(0x1f7, write_cmd);
outsl(0x1f0, b->data, BSIZE/4);
} else {
outb(0x1f7, IDE_CMD_READ);
outb(0x1f7, read_cmd);
}
}