Marc Zyngier | fb9bd7d6 | 2012-03-05 11:49:29 +0000 | [diff] [blame] | 1 | #ifndef __ASM_IRQ_H |
| 2 | #define __ASM_IRQ_H |
| 3 | |
AKASHI Takahiro | 132cd88 | 2015-12-04 11:02:26 +0000 | [diff] [blame] | 4 | #define IRQ_STACK_SIZE THREAD_SIZE |
| 5 | #define IRQ_STACK_START_SP THREAD_START_SP |
| 6 | |
| 7 | #ifndef __ASSEMBLER__ |
| 8 | |
| 9 | #include <linux/percpu.h> |
| 10 | |
Marc Zyngier | fb9bd7d6 | 2012-03-05 11:49:29 +0000 | [diff] [blame] | 11 | #include <asm-generic/irq.h> |
AKASHI Takahiro | 132cd88 | 2015-12-04 11:02:26 +0000 | [diff] [blame] | 12 | #include <asm/thread_info.h> |
Marc Zyngier | fb9bd7d6 | 2012-03-05 11:49:29 +0000 | [diff] [blame] | 13 | |
Chunyan Zhang | af2c632 | 2014-12-04 06:29:35 +0000 | [diff] [blame] | 14 | struct pt_regs; |
| 15 | |
AKASHI Takahiro | 132cd88 | 2015-12-04 11:02:26 +0000 | [diff] [blame] | 16 | DECLARE_PER_CPU(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack); |
| 17 | |
| 18 | /* |
| 19 | * The highest address on the stack, and the first to be used. Used to |
Will Deacon | 7596abf | 2015-12-09 13:58:42 +0000 | [diff] [blame] | 20 | * find the dummy-stack frame put down by el?_irq() in entry.S, which |
| 21 | * is structured as follows: |
| 22 | * |
| 23 | * ------------ |
| 24 | * | | <- irq_stack_ptr |
| 25 | * top ------------ |
James Morse | 971c67c | 2015-12-15 11:21:25 +0000 | [diff] [blame] | 26 | * | x19 | <- irq_stack_ptr - 0x08 |
Will Deacon | 7596abf | 2015-12-09 13:58:42 +0000 | [diff] [blame] | 27 | * ------------ |
| 28 | * | x29 | <- irq_stack_ptr - 0x10 |
| 29 | * ------------ |
Will Deacon | 7596abf | 2015-12-09 13:58:42 +0000 | [diff] [blame] | 30 | * |
James Morse | 971c67c | 2015-12-15 11:21:25 +0000 | [diff] [blame] | 31 | * where x19 holds a copy of the task stack pointer where the struct pt_regs |
| 32 | * from kernel_entry can be found. |
Will Deacon | 7596abf | 2015-12-09 13:58:42 +0000 | [diff] [blame] | 33 | * |
AKASHI Takahiro | 132cd88 | 2015-12-04 11:02:26 +0000 | [diff] [blame] | 34 | */ |
| 35 | #define IRQ_STACK_PTR(cpu) ((unsigned long)per_cpu(irq_stack, cpu) + IRQ_STACK_START_SP) |
| 36 | |
| 37 | /* |
| 38 | * The offset from irq_stack_ptr where entry.S will store the original |
| 39 | * stack pointer. Used by unwind_frame() and dump_backtrace(). |
| 40 | */ |
James Morse | 971c67c | 2015-12-15 11:21:25 +0000 | [diff] [blame] | 41 | #define IRQ_STACK_TO_TASK_STACK(ptr) (*((unsigned long *)((ptr) - 0x08))) |
AKASHI Takahiro | 132cd88 | 2015-12-04 11:02:26 +0000 | [diff] [blame] | 42 | |
Catalin Marinas | e851b58 | 2013-01-14 12:39:31 +0000 | [diff] [blame] | 43 | extern void set_handle_irq(void (*handle_irq)(struct pt_regs *)); |
Marc Zyngier | fb9bd7d6 | 2012-03-05 11:49:29 +0000 | [diff] [blame] | 44 | |
Boris Ostrovsky | b4ff838 | 2015-11-20 11:25:04 -0500 | [diff] [blame] | 45 | static inline int nr_legacy_irqs(void) |
| 46 | { |
| 47 | return 0; |
| 48 | } |
| 49 | |
AKASHI Takahiro | 132cd88 | 2015-12-04 11:02:26 +0000 | [diff] [blame] | 50 | static inline bool on_irq_stack(unsigned long sp, int cpu) |
| 51 | { |
| 52 | /* variable names the same as kernel/stacktrace.c */ |
| 53 | unsigned long low = (unsigned long)per_cpu(irq_stack, cpu); |
| 54 | unsigned long high = low + IRQ_STACK_START_SP; |
| 55 | |
| 56 | return (low <= sp && sp <= high); |
| 57 | } |
| 58 | |
| 59 | #endif /* !__ASSEMBLER__ */ |
Marc Zyngier | fb9bd7d6 | 2012-03-05 11:49:29 +0000 | [diff] [blame] | 60 | #endif |