struct task_struct *__sched _switch_to(struct task_struct *prev,
struct task_struct *next)
{
/* DMA state is already saved; save off other arch state. */
save_arch_state(&prev->thread);
#if CHIP_HAS_TILE_DMA()
/*
* Restore DMA in new task if desired.
* Note that it is only safe to restart here since interrupts
* are disabled, so we can't take any DMATLB miss or access
* interrupts before we have finished switching stacks.
*/
if (next->thread.tile_dma_state.enabled) {
restore_tile_dma_state(&next->thread);
grant_dma_mpls();
} else {
restrict_dma_mpls();
}
#endif
/* Restore other arch state. */
restore_arch_state(&next->thread);
#if CHIP_HAS_SN_PROC()
/*
* Restart static network processor in the new process
* if it was running before.
*/
if (next->thread.sn_proc_running) {
int snctl = __insn_mfspr(SPR_SNCTL);
__insn_mtspr(SPR_SNCTL, snctl & ~SPR_SNCTL__FRZPROC_MASK);
}
#endif
#ifdef CONFIG_HARDWALL
/* Enable or disable access to the network registers appropriately. */
if (prev->thread.hardwall != NULL) {
if (next->thread.hardwall == NULL)
restrict_network_mpls();
} else if (next->thread.hardwall != NULL) {
grant_network_mpls();
}
#endif
/*
* Switch kernel SP, PC, and callee-saved registers.
* In the context of the new task, return the old task pointer
* (i.e. the task that actually called __switch_to).
* Pass the value to use for SYSTEM_SAVE_K_0 when we reset our sp.
*/
return __switch_to(prev, next, next_current_ksp0(next));
}
static void switch_to(struct task_struct *prev, struct task_struct *next) {
struct thread_info *prev_thread = task_thread_info(prev);
struct thread_info *next_thread = task_thread_info(next);
printk(PR_SS_PROC, PR_LVL_DBG5, "%s, prev_thread = %x, next_thread = %x\n", __func__, prev_thread, next_thread);
__switch_to(prev,task_thread_info(prev), task_thread_info(next));
}
