| Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 1 | #ifndef _ASM_ARM_XEN_EVENTS_H |
| 2 | #define _ASM_ARM_XEN_EVENTS_H |
| 3 | |
| 4 | #include <asm/ptrace.h> |
| 5 | |
| 6 | enum ipi_vector { |
| 7 | XEN_PLACEHOLDER_VECTOR, |
| 8 | |
| 9 | /* Xen IPIs go here */ |
| 10 | XEN_NR_IPIS, |
| 11 | }; |
| 12 | |
| 13 | static inline int xen_irqs_disabled(struct pt_regs *regs) |
| 14 | { |
| 15 | return raw_irqs_disabled_flags(regs->ARM_cpsr); |
| 16 | } |
| 17 | |
| Ian Campbell | c81611c | 2013-02-20 11:48:06 +0000 | [diff] [blame] | 18 | /* |
| 19 | * We cannot use xchg because it does not support 8-byte |
| 20 | * values. However it is safe to use {ldr,dtd}exd directly because all |
| 21 | * platforms which Xen can run on support those instructions. |
| 22 | */ |
| 23 | static inline xen_ulong_t xchg_xen_ulong(xen_ulong_t *ptr, xen_ulong_t val) |
| 24 | { |
| 25 | xen_ulong_t oldval; |
| 26 | unsigned int tmp; |
| 27 | |
| 28 | wmb(); |
| 29 | asm volatile("@ xchg_xen_ulong\n" |
| 30 | "1: ldrexd %0, %H0, [%3]\n" |
| 31 | " strexd %1, %2, %H2, [%3]\n" |
| 32 | " teq %1, #0\n" |
| 33 | " bne 1b" |
| 34 | : "=&r" (oldval), "=&r" (tmp) |
| 35 | : "r" (val), "r" (ptr) |
| 36 | : "memory", "cc"); |
| 37 | return oldval; |
| 38 | } |
| 39 | |
| Stefano Stabellini | 0ec53ec | 2012-09-14 13:37:32 +0000 | [diff] [blame] | 40 | #endif /* _ASM_ARM_XEN_EVENTS_H */ |