| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * Copyright 2010 IBM Corp, Benjamin Herrenschmidt <benh@kernel.crashing.org> |
| * |
| * Generic idle routine for Book3E 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 */ |
| #ifdef CONFIG_PPC64 |
| |
| .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(0) |
| 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 book3e_idle BOOK3E_IDLE_LOOP |
| |
| #endif /* CONFIG_PPC64 */ |
