| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* |
| 3 | * IRQ flags handling |
| 4 | */ |
| 5 | #ifndef _ASM_IRQFLAGS_H |
| 6 | #define _ASM_IRQFLAGS_H |
| 7 | |
| 8 | #ifndef __ASSEMBLY__ |
| 9 | /* |
| 10 | * Get definitions for arch_local_save_flags(x), etc. |
| 11 | */ |
| 12 | #include <asm/hw_irq.h> |
| 13 | |
| 14 | #else |
| 15 | #ifdef CONFIG_TRACE_IRQFLAGS |
| 16 | #ifdef CONFIG_IRQSOFF_TRACER |
| 17 | /* |
| 18 | * Since the ftrace irqsoff latency trace checks CALLER_ADDR1, |
| 19 | * which is the stack frame here, we need to force a stack frame |
| 20 | * in case we came from user space. |
| 21 | */ |
| 22 | #define TRACE_WITH_FRAME_BUFFER(func) \ |
| 23 | mflr r0; \ |
| 24 | stdu r1, -STACK_FRAME_OVERHEAD(r1); \ |
| 25 | std r0, 16(r1); \ |
| 26 | stdu r1, -STACK_FRAME_OVERHEAD(r1); \ |
| 27 | bl func; \ |
| 28 | ld r1, 0(r1); \ |
| 29 | ld r1, 0(r1); |
| 30 | #else |
| 31 | #define TRACE_WITH_FRAME_BUFFER(func) \ |
| 32 | bl func; |
| 33 | #endif |
| 34 | |
| 35 | /* |
| 36 | * These are calls to C code, so the caller must be prepared for volatiles to |
| 37 | * be clobbered. |
| 38 | */ |
| 39 | #define TRACE_ENABLE_INTS TRACE_WITH_FRAME_BUFFER(trace_hardirqs_on) |
| 40 | #define TRACE_DISABLE_INTS TRACE_WITH_FRAME_BUFFER(trace_hardirqs_off) |
| 41 | |
| 42 | /* |
| 43 | * This is used by assembly code to soft-disable interrupts first and |
| 44 | * reconcile irq state. |
| 45 | * |
| 46 | * NB: This may call C code, so the caller must be prepared for volatiles to |
| 47 | * be clobbered. |
| 48 | */ |
| 49 | #define RECONCILE_IRQ_STATE(__rA, __rB) \ |
| 50 | lbz __rA,PACAIRQSOFTMASK(r13); \ |
| 51 | lbz __rB,PACAIRQHAPPENED(r13); \ |
| 52 | andi. __rA,__rA,IRQS_DISABLED; \ |
| 53 | li __rA,IRQS_DISABLED; \ |
| 54 | ori __rB,__rB,PACA_IRQ_HARD_DIS; \ |
| 55 | stb __rB,PACAIRQHAPPENED(r13); \ |
| 56 | bne 44f; \ |
| 57 | stb __rA,PACAIRQSOFTMASK(r13); \ |
| 58 | TRACE_DISABLE_INTS; \ |
| 59 | 44: |
| 60 | |
| 61 | #else |
| 62 | #define TRACE_ENABLE_INTS |
| 63 | #define TRACE_DISABLE_INTS |
| 64 | |
| 65 | #define RECONCILE_IRQ_STATE(__rA, __rB) \ |
| 66 | lbz __rA,PACAIRQHAPPENED(r13); \ |
| 67 | li __rB,IRQS_DISABLED; \ |
| 68 | ori __rA,__rA,PACA_IRQ_HARD_DIS; \ |
| 69 | stb __rB,PACAIRQSOFTMASK(r13); \ |
| 70 | stb __rA,PACAIRQHAPPENED(r13) |
| 71 | #endif |
| 72 | #endif |
| 73 | |
| 74 | #endif |