diff options
Diffstat (limited to 'include/asm-parisc/system.h')
| -rw-r--r-- | include/asm-parisc/system.h | 48 |
1 files changed, 23 insertions, 25 deletions
diff --git a/include/asm-parisc/system.h b/include/asm-parisc/system.h index 26ff844a21c..f3928d3a80c 100644 --- a/include/asm-parisc/system.h +++ b/include/asm-parisc/system.h @@ -138,13 +138,7 @@ static inline void set_eiem(unsigned long val) #define set_wmb(var, value) do { var = value; wmb(); } while (0) -/* LDCW, the only atomic read-write operation PA-RISC has. *sigh*. */ -#define __ldcw(a) ({ \ - unsigned __ret; \ - __asm__ __volatile__("ldcw 0(%1),%0" : "=r" (__ret) : "r" (a)); \ - __ret; \ -}) - +#ifndef CONFIG_PA20 /* Because kmalloc only guarantees 8-byte alignment for kmalloc'd data, and GCC only guarantees 8-byte alignment for stack locals, we can't be assured of 16-byte alignment for atomic lock data even if we @@ -152,37 +146,41 @@ static inline void set_eiem(unsigned long val) we use a struct containing an array of four ints for the atomic lock type and dynamically select the 16-byte aligned int from the array for the semaphore. */ + #define __PA_LDCW_ALIGNMENT 16 #define __ldcw_align(a) ({ \ unsigned long __ret = (unsigned long) &(a)->lock[0]; \ __ret = (__ret + __PA_LDCW_ALIGNMENT - 1) & ~(__PA_LDCW_ALIGNMENT - 1); \ (volatile unsigned int *) __ret; \ }) +#define LDCW "ldcw" -#ifdef CONFIG_SMP -# define __lock_aligned __attribute__((__section__(".data.lock_aligned"))) -#endif +#else /*CONFIG_PA20*/ +/* From: "Jim Hull" <jim.hull of hp.com> + I've attached a summary of the change, but basically, for PA 2.0, as + long as the ",CO" (coherent operation) completer is specified, then the + 16-byte alignment requirement for ldcw and ldcd is relaxed, and instead + they only require "natural" alignment (4-byte for ldcw, 8-byte for + ldcd). */ -#define KERNEL_START (0x10100000 - 0x1000) +#define __PA_LDCW_ALIGNMENT 4 +#define __ldcw_align(a) ((volatile unsigned int *)a) +#define LDCW "ldcw,co" -/* This is for the serialisation of PxTLB broadcasts. At least on the - * N class systems, only one PxTLB inter processor broadcast can be - * active at any one time on the Merced bus. This tlb purge - * synchronisation is fairly lightweight and harmless so we activate - * it on all SMP systems not just the N class. */ -#ifdef CONFIG_SMP -extern spinlock_t pa_tlb_lock; +#endif /*!CONFIG_PA20*/ -#define purge_tlb_start(x) spin_lock(&pa_tlb_lock) -#define purge_tlb_end(x) spin_unlock(&pa_tlb_lock) - -#else - -#define purge_tlb_start(x) do { } while(0) -#define purge_tlb_end(x) do { } while (0) +/* LDCW, the only atomic read-write operation PA-RISC has. *sigh*. */ +#define __ldcw(a) ({ \ + unsigned __ret; \ + __asm__ __volatile__(LDCW " 0(%1),%0" : "=r" (__ret) : "r" (a)); \ + __ret; \ +}) +#ifdef CONFIG_SMP +# define __lock_aligned __attribute__((__section__(".data.lock_aligned"))) #endif +#define KERNEL_START (0x10100000 - 0x1000) #define arch_align_stack(x) (x) #endif |