/* Drop into the prom, with the chance to continue with the 'go'
* prom command.
*/
void
prom_cmdline(void)
{
unsigned long flags;
__save_and_cli(flags);
#ifdef CONFIG_SUN_CONSOLE
if(!serial_console && prom_palette)
prom_palette (1);
#endif
#ifdef CONFIG_SMP
smp_capture();
#endif
p1275_cmd ("enter", P1275_INOUT(0,0));
#ifdef CONFIG_SMP
smp_release();
spin_unlock_wait(&__br_write_locks[BR_GLOBALIRQ_LOCK].lock);
#endif
#ifdef CONFIG_SUN_CONSOLE
if(!serial_console && prom_palette)
prom_palette (0);
#endif
__restore_flags(flags);
}
/* guest side */
int add_inbuf(unsigned len, void *buf, void *datap)
{
unsigned head, avail;
struct vring_desc *desc;
if (!guest.num_free)
return -1;
head = guest.free_head;
guest.num_free--;
desc = ring.desc;
desc[head].flags = VRING_DESC_F_NEXT;
desc[head].addr = (unsigned long)(void *)buf;
desc[head].len = len;
/* We do it like this to simulate the way
* we'd have to flip it if we had multiple
* descriptors.
*/
desc[head].flags &= ~VRING_DESC_F_NEXT;
guest.free_head = desc[head].next;
data[head].data = datap;
#ifdef RING_POLL
/* Barrier A (for pairing) */
smp_release();
avail = guest.avail_idx++;
ring.avail->ring[avail & (ring_size - 1)] =
(head | (avail & ~(ring_size - 1))) ^ 0x8000;
#else
avail = (ring_size - 1) & (guest.avail_idx++);
ring.avail->ring[avail] = head;
/* Barrier A (for pairing) */
smp_release();
#endif
ring.avail->idx = guest.avail_idx;
return 0;
}
/* Drop into the prom, with the chance to continue with the 'go'
* prom command.
*/
void prom_cmdline(void)
{
unsigned long flags;
local_irq_save(flags);
#ifdef CONFIG_SMP
smp_capture();
#endif
p1275_cmd("enter", P1275_INOUT(0, 0));
#ifdef CONFIG_SMP
smp_release();
#endif
local_irq_restore(flags);
}
/* Drop into the prom, with the chance to continue with the 'go'
* prom command.
*/
void
prom_cmdline(void)
{
unsigned long flags;
__save_and_cli(flags);
#ifdef CONFIG_SUN_CONSOLE
if(!serial_console && prom_palette)
prom_palette (1);
#endif
/* We always arrive here via a serial interrupt.
* So in order for everything to work reliably, even
* on SMP, we need to drop the IRQ locks we hold.
*/
#ifdef CONFIG_SMP
irq_exit(smp_processor_id(), 0);
smp_capture();
#else
local_irq_count(smp_processor_id())--;
#endif
p1275_cmd ("enter", P1275_INOUT(0,0));
#ifdef CONFIG_SMP
smp_release();
irq_enter(smp_processor_id(), 0);
spin_unlock_wait(&__br_write_locks[BR_GLOBALIRQ_LOCK].lock);
#else
local_irq_count(smp_processor_id())++;
#endif
#ifdef CONFIG_SUN_CONSOLE
if(!serial_console && prom_palette)
prom_palette (0);
#endif
__restore_flags(flags);
}
bool use_buf(unsigned *lenp, void **bufp)
{
unsigned used_idx = host.used_idx;
struct vring_desc *desc;
unsigned head;
#ifdef RING_POLL
head = ring.avail->ring[used_idx & (ring_size - 1)];
if ((used_idx ^ head ^ 0x8000) & ~(ring_size - 1))
return false;
/* Barrier A (for pairing) */
smp_acquire();
used_idx &= ring_size - 1;
desc = &ring.desc[head & (ring_size - 1)];
#else
if (used_idx == ring.avail->idx)
return false;
/* Barrier A (for pairing) */
smp_acquire();
used_idx &= ring_size - 1;
head = ring.avail->ring[used_idx];
desc = &ring.desc[head];
#endif
*lenp = desc->len;
*bufp = (void *)(unsigned long)desc->addr;
/* now update used ring */
ring.used->ring[used_idx].id = head;
ring.used->ring[used_idx].len = desc->len - 1;
/* Barrier B (for pairing) */
smp_release();
host.used_idx++;
ring.used->idx = host.used_idx;
return true;
}
/* Drop into the prom, with the chance to continue with the 'go'
* prom command.
*/
void prom_cmdline(void)
{
unsigned long args[3];
unsigned long flags;
local_irq_save(flags);
#ifdef CONFIG_SMP
smp_capture();
#endif
args[0] = (unsigned long) "enter";
args[1] = 0;
args[2] = 0;
p1275_cmd_direct(args);
#ifdef CONFIG_SMP
smp_release();
#endif
local_irq_restore(flags);
}
/* Drop into the prom, with the chance to continue with the 'go'
* prom command.
*/
void prom_cmdline(void)
{
unsigned long flags;
local_irq_save(flags);
if (!serial_console && prom_palette)
prom_palette(1);
#ifdef CONFIG_SMP
smp_capture();
#endif
p1275_cmd("enter", P1275_INOUT(0, 0));
#ifdef CONFIG_SMP
smp_release();
#endif
if (!serial_console && prom_palette)
prom_palette(0);
local_irq_restore(flags);
}
