1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright 2010 IBM Corp, Benjamin Herrenschmidt <benh@kernel.crashing.org>
5 * Generic idle routine for 64 bits e500 processors
8 #include <linux/threads.h>
10 #include <asm/ppc_asm.h>
11 #include <asm/asm-offsets.h>
12 #include <asm/ppc-opcode.h>
13 #include <asm/processor.h>
14 #include <asm/thread_info.h>
15 #include <asm/epapr_hcalls.h>
16 #include <asm/hw_irq.h>
18 /* 64-bit version only for now */
19 .macro BOOK3E_IDLE name loop
21 /* Save LR for later */
25 /* Hard disable interrupts */
28 /* Now check if an interrupt came in while we were soft disabled
29 * since we may otherwise lose it (doorbells etc...).
31 lbz r3,PACAIRQHAPPENED(r13)
35 /* Now we are going to mark ourselves as soft and hard enabled in
36 * order to be able to take interrupts while asleep. We inform lockdep
37 * of that. We don't actually turn interrupts on just yet tho.
39 #ifdef CONFIG_TRACE_IRQFLAGS
45 stb r0,PACAIRQSOFTMASK(r13)
47 /* Interrupts will make use return to LR, so get something we want
52 /* And return (interrupts are on) */
57 1: /* Let's set the _TLF_NAPPING flag so interrupts make us return
60 ld r11, PACACURRENT(r13)
61 ld r10,TI_LOCAL_FLAGS(r11)
62 ori r10,r10,_TLF_NAPPING
63 std r10,TI_LOCAL_FLAGS(r11)
65 /* We can now re-enable hard interrupts and go to sleep */
70 lbz r10,PACAIRQHAPPENED(r13)
71 ori r10,r10,PACA_IRQ_HARD_DIS
72 stb r10,PACAIRQHAPPENED(r13)
76 .macro BOOK3E_IDLE_LOOP
82 /* epapr_ev_idle_start below is patched with the proper hcall
83 opcodes during kernel initialization */
84 .macro EPAPR_EV_IDLE_LOOP
86 LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE))
88 .global epapr_ev_idle_start
97 BOOK3E_IDLE epapr_ev_idle EPAPR_EV_IDLE_LOOP
99 BOOK3E_IDLE e500_idle BOOK3E_IDLE_LOOP