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/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright 2010 IBM Corp, Benjamin Herrenschmidt <benh@kernel.crashing.org> * * Generic idle routine for 64 bits e500 processors */ #include <linux/threads.h> #include <asm/reg.h> #include <asm/ppc_asm.h> #include <asm/asm-offsets.h> #include <asm/ppc-opcode.h> #include <asm/processor.h> #include <asm/thread_info.h> #include <asm/epapr_hcalls.h> #include <asm/hw_irq.h> /* 64-bit version only for now */ .macro BOOK3E_IDLE name loop _GLOBAL(\name) /* Save LR for later */ mflr r0 std r0,16(r1) /* Hard disable interrupts */ wrteei 0 /* Now check if an interrupt came in while we were soft disabled * since we may otherwise lose it (doorbells etc...). */ lbz r3,PACAIRQHAPPENED(r13) cmpwi cr0,r3,0 bne 2f /* Now we are going to mark ourselves as soft and hard enabled in * order to be able to take interrupts while asleep. We inform lockdep * of that. We don't actually turn interrupts on just yet tho. */ #ifdef CONFIG_TRACE_IRQFLAGS stdu r1,-128(r1) bl trace_hardirqs_on addi r1,r1,128 #endif li r0,IRQS_ENABLED stb r0,PACAIRQSOFTMASK(r13) /* Interrupts will make use return to LR, so get something we want * in there */ bl 1f /* And return (interrupts are on) */ ld r0,16(r1) mtlr r0 blr 1: /* Let's set the _TLF_NAPPING flag so interrupts make us return * to the right spot */ ld r11, PACACURRENT(r13) ld r10,TI_LOCAL_FLAGS(r11) ori r10,r10,_TLF_NAPPING std r10,TI_LOCAL_FLAGS(r11) /* We can now re-enable hard interrupts and go to sleep */ wrteei 1 \loop 2: lbz r10,PACAIRQHAPPENED(r13) ori r10,r10,PACA_IRQ_HARD_DIS stb r10,PACAIRQHAPPENED(r13) blr .endm .macro BOOK3E_IDLE_LOOP 1: PPC_WAIT_v203 b 1b .endm /* epapr_ev_idle_start below is patched with the proper hcall opcodes during kernel initialization */ .macro EPAPR_EV_IDLE_LOOP idle_loop: LOAD_REG_IMMEDIATE(r11, EV_HCALL_TOKEN(EV_IDLE)) .global epapr_ev_idle_start epapr_ev_idle_start: li r3, -1 nop nop nop b idle_loop .endm BOOK3E_IDLE epapr_ev_idle EPAPR_EV_IDLE_LOOP BOOK3E_IDLE e500_idle BOOK3E_IDLE_LOOP |