/**
* Enable access to Octeon's COP2 crypto hardware for kernel use.
* Wrap any crypto operations in calls to
* octeon_crypto_enable/disable in order to make sure the state of
* COP2 isn't corrupted if userspace is also performing hardware
* crypto operations. Allocate the state parameter on the stack.
*
* @param state State structure to store current COP2 state in
*
* @return Flags to be passed to octeon_crypto_disable()
*/
unsigned long octeon_crypto_enable(struct octeon_cop2_state *state)
{
int status;
unsigned long flags;
local_irq_save(flags);
status = read_c0_status();
write_c0_status(status | ST0_CU2);
if (KSTK_STATUS(current) & ST0_CU2) {
octeon_cop2_save(&(current->thread.cp2));
KSTK_STATUS(current) &= ~ST0_CU2;
status &= ~ST0_CU2;
} else if (status & ST0_CU2)
octeon_cop2_save(state);
local_irq_restore(flags);
return status & ST0_CU2;
}
static int cnmips_cu2_call(struct notifier_block *nfb, unsigned long action,
void *data)
{
unsigned long flags;
unsigned int status;
switch (action) {
case CU2_EXCEPTION:
prefetch(¤t->thread.cp2);
local_irq_save(flags);
KSTK_STATUS(current) |= ST0_CU2;
status = read_c0_status();
write_c0_status(status | ST0_CU2);
octeon_cop2_restore(&(current->thread.cp2));
write_c0_status(status & ~ST0_CU2);
local_irq_restore(flags);
return NOTIFY_BAD; /* Don't call default notifier */
}
return NOTIFY_OK; /* Let default notifier send signals */
}
