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ide.c: make names more regular

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rsc 2009-05-31 01:29:01 +00:00
parent 7b644318dd
commit c47bc4fd54
1 changed files with 26 additions and 23 deletions
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49
ide.c
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@ -18,14 +18,14 @@
#define IDE_CMD_READ 0x20
#define IDE_CMD_WRITE 0x30
// ide_queue points to the buf now being read/written to the disk.
// ide_queue->qnext points to the next buf to be processed.
// You must hold ide_lock while manipulating queue.
// idequeue points to the buf now being read/written to the disk.
// idequeue->qnext points to the next buf to be processed.
// You must hold idelock while manipulating queue.
static struct spinlock ide_lock;
static struct buf *ide_queue;
static struct spinlock idelock;
static struct buf *idequeue;
static int disk_1_present;
static int havedisk1;
static void idestart(struct buf*);
// Wait for IDE disk to become ready.
@ -34,7 +34,7 @@ idewait(int check_error)
{
int r;
while(((r = inb(0x1f7)) & IDE_BSY) || !(r & IDE_DRDY))
while(((r = inb(0x1f7)) & (IDE_BSY|IDE_DRDY)) != IDE_DRDY)
;
if(check_error && (r & (IDE_DF|IDE_ERR)) != 0)
return -1;
@ -46,7 +46,7 @@ ideinit(void)
{
int i;
initlock(&ide_lock, "ide");
initlock(&idelock, "ide");
picenable(IRQ_IDE);
ioapicenable(IRQ_IDE, ncpu - 1);
idewait(0);
@ -55,7 +55,7 @@ ideinit(void)
outb(0x1f6, 0xe0 | (1<<4));
for(i=0; i<1000; i++){
if(inb(0x1f7) != 0){
disk_1_present = 1;
havedisk1 = 1;
break;
}
}
@ -64,7 +64,7 @@ ideinit(void)
outb(0x1f6, 0xe0 | (0<<4));
}
// Start the request for b. Caller must hold ide_lock.
// Start the request for b. Caller must hold idelock.
static void
idestart(struct buf *b)
{
@ -92,11 +92,14 @@ ideintr(void)
{
struct buf *b;
acquire(&ide_lock);
if((b = ide_queue) == 0){
release(&ide_lock);
// Take first buffer off queue.
acquire(&idelock);
if((b = idequeue) == 0){
release(&idelock);
cprintf("Spurious IDE interrupt.\n");
return;
}
idequeue = b->qnext;
// Read data if needed.
if(!(b->flags & B_DIRTY) && idewait(1) >= 0)
@ -108,10 +111,10 @@ ideintr(void)
wakeup(b);
// Start disk on next buf in queue.
if((ide_queue = b->qnext) != 0)
idestart(ide_queue);
if(idequeue != 0)
idestart(idequeue);
release(&ide_lock);
release(&idelock);
}
//PAGEBREAK!
@ -127,25 +130,25 @@ iderw(struct buf *b)
panic("iderw: buf not busy");
if((b->flags & (B_VALID|B_DIRTY)) == B_VALID)
panic("iderw: nothing to do");
if(b->dev != 0 && !disk_1_present)
if(b->dev != 0 && !havedisk1)
panic("idrw: ide disk 1 not present");
acquire(&ide_lock);
acquire(&idelock);
// Append b to ide_queue.
// Append b to idequeue.
b->qnext = 0;
for(pp=&ide_queue; *pp; pp=&(*pp)->qnext)
for(pp=&idequeue; *pp; pp=&(*pp)->qnext)
;
*pp = b;
// Start disk if necessary.
if(ide_queue == b)
if(idequeue == b)
idestart(b);
// Wait for request to finish.
// Assuming will not sleep too long: ignore cp->killed.
while((b->flags & (B_VALID|B_DIRTY)) != B_VALID)
sleep(b, &ide_lock);
sleep(b, &idelock);
release(&ide_lock);
release(&idelock);
}