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Diffstat (limited to 'include/asm-sparc64/system.h')
| -rw-r--r-- | include/asm-sparc64/system.h | 350 |
1 files changed, 350 insertions, 0 deletions
diff --git a/include/asm-sparc64/system.h b/include/asm-sparc64/system.h new file mode 100644 index 00000000000..fd12ca386f4 --- /dev/null +++ b/include/asm-sparc64/system.h @@ -0,0 +1,350 @@ +/* $Id: system.h,v 1.69 2002/02/09 19:49:31 davem Exp $ */ +#ifndef __SPARC64_SYSTEM_H +#define __SPARC64_SYSTEM_H + +#include <linux/config.h> +#include <asm/ptrace.h> +#include <asm/processor.h> +#include <asm/visasm.h> + +#ifndef __ASSEMBLY__ +/* + * Sparc (general) CPU types + */ +enum sparc_cpu { + sun4 = 0x00, + sun4c = 0x01, + sun4m = 0x02, + sun4d = 0x03, + sun4e = 0x04, + sun4u = 0x05, /* V8 ploos ploos */ + sun_unknown = 0x06, + ap1000 = 0x07, /* almost a sun4m */ +}; + +#define sparc_cpu_model sun4u + +/* This cannot ever be a sun4c nor sun4 :) That's just history. */ +#define ARCH_SUN4C_SUN4 0 +#define ARCH_SUN4 0 + +#endif + +#define setipl(__new_ipl) \ + __asm__ __volatile__("wrpr %0, %%pil" : : "r" (__new_ipl) : "memory") + +#define local_irq_disable() \ + __asm__ __volatile__("wrpr 15, %%pil" : : : "memory") + +#define local_irq_enable() \ + __asm__ __volatile__("wrpr 0, %%pil" : : : "memory") + +#define getipl() \ +({ unsigned long retval; __asm__ __volatile__("rdpr %%pil, %0" : "=r" (retval)); retval; }) + +#define swap_pil(__new_pil) \ +({ unsigned long retval; \ + __asm__ __volatile__("rdpr %%pil, %0\n\t" \ + "wrpr %1, %%pil" \ + : "=&r" (retval) \ + : "r" (__new_pil) \ + : "memory"); \ + retval; \ +}) + +#define read_pil_and_cli() \ +({ unsigned long retval; \ + __asm__ __volatile__("rdpr %%pil, %0\n\t" \ + "wrpr 15, %%pil" \ + : "=r" (retval) \ + : : "memory"); \ + retval; \ +}) + +#define local_save_flags(flags) ((flags) = getipl()) +#define local_irq_save(flags) ((flags) = read_pil_and_cli()) +#define local_irq_restore(flags) setipl((flags)) + +/* On sparc64 IRQ flags are the PIL register. A value of zero + * means all interrupt levels are enabled, any other value means + * only IRQ levels greater than that value will be received. + * Consequently this means that the lowest IRQ level is one. + */ +#define irqs_disabled() \ +({ unsigned long flags; \ + local_save_flags(flags);\ + (flags > 0); \ +}) + +#define nop() __asm__ __volatile__ ("nop") + +#define membar(type) __asm__ __volatile__ ("membar " type : : : "memory") +#define mb() \ + membar("#LoadLoad | #LoadStore | #StoreStore | #StoreLoad") +#define rmb() membar("#LoadLoad") +#define wmb() membar("#StoreStore") +#define read_barrier_depends() do { } while(0) +#define set_mb(__var, __value) \ + do { __var = __value; membar("#StoreLoad | #StoreStore"); } while(0) +#define set_wmb(__var, __value) \ + do { __var = __value; membar("#StoreStore"); } while(0) + +#ifdef CONFIG_SMP +#define smp_mb() mb() +#define smp_rmb() rmb() +#define smp_wmb() wmb() +#define smp_read_barrier_depends() read_barrier_depends() +#else +#define smp_mb() __asm__ __volatile__("":::"memory") +#define smp_rmb() __asm__ __volatile__("":::"memory") +#define smp_wmb() __asm__ __volatile__("":::"memory") +#define smp_read_barrier_depends() do { } while(0) +#endif + +#define flushi(addr) __asm__ __volatile__ ("flush %0" : : "r" (addr) : "memory") + +#define flushw_all() __asm__ __volatile__("flushw") + +/* Performance counter register access. */ +#define read_pcr(__p) __asm__ __volatile__("rd %%pcr, %0" : "=r" (__p)) +#define write_pcr(__p) __asm__ __volatile__("wr %0, 0x0, %%pcr" : : "r" (__p)) +#define read_pic(__p) __asm__ __volatile__("rd %%pic, %0" : "=r" (__p)) + +/* Blackbird errata workaround. See commentary in + * arch/sparc64/kernel/smp.c:smp_percpu_timer_interrupt() + * for more information. + */ +#define reset_pic() \ + __asm__ __volatile__("ba,pt %xcc, 99f\n\t" \ + ".align 64\n" \ + "99:wr %g0, 0x0, %pic\n\t" \ + "rd %pic, %g0") + +#ifndef __ASSEMBLY__ + +extern void sun_do_break(void); +extern int serial_console; +extern int stop_a_enabled; + +static __inline__ int con_is_present(void) +{ + return serial_console ? 0 : 1; +} + +extern void synchronize_user_stack(void); + +extern void __flushw_user(void); +#define flushw_user() __flushw_user() + +#define flush_user_windows flushw_user +#define flush_register_windows flushw_all + +#define prepare_arch_switch(rq, next) \ +do { spin_lock(&(next)->switch_lock); \ + spin_unlock(&(rq)->lock); \ + flushw_all(); \ +} while (0) + +#define finish_arch_switch(rq, prev) \ +do { spin_unlock_irq(&(prev)->switch_lock); \ +} while (0) + +#define task_running(rq, p) \ + ((rq)->curr == (p) || spin_is_locked(&(p)->switch_lock)) + + /* See what happens when you design the chip correctly? + * + * We tell gcc we clobber all non-fixed-usage registers except + * for l0/l1. It will use one for 'next' and the other to hold + * the output value of 'last'. 'next' is not referenced again + * past the invocation of switch_to in the scheduler, so we need + * not preserve it's value. Hairy, but it lets us remove 2 loads + * and 2 stores in this critical code path. -DaveM + */ +#if __GNUC__ >= 3 +#define EXTRA_CLOBBER ,"%l1" +#else +#define EXTRA_CLOBBER +#endif +#define switch_to(prev, next, last) \ +do { if (test_thread_flag(TIF_PERFCTR)) { \ + unsigned long __tmp; \ + read_pcr(__tmp); \ + current_thread_info()->pcr_reg = __tmp; \ + read_pic(__tmp); \ + current_thread_info()->kernel_cntd0 += (unsigned int)(__tmp);\ + current_thread_info()->kernel_cntd1 += ((__tmp) >> 32); \ + } \ + flush_tlb_pending(); \ + save_and_clear_fpu(); \ + /* If you are tempted to conditionalize the following */ \ + /* so that ASI is only written if it changes, think again. */ \ + __asm__ __volatile__("wr %%g0, %0, %%asi" \ + : : "r" (__thread_flag_byte_ptr(next->thread_info)[TI_FLAG_BYTE_CURRENT_DS]));\ + __asm__ __volatile__( \ + "mov %%g4, %%g7\n\t" \ + "wrpr %%g0, 0x95, %%pstate\n\t" \ + "stx %%i6, [%%sp + 2047 + 0x70]\n\t" \ + "stx %%i7, [%%sp + 2047 + 0x78]\n\t" \ + "rdpr %%wstate, %%o5\n\t" \ + "stx %%o6, [%%g6 + %3]\n\t" \ + "stb %%o5, [%%g6 + %2]\n\t" \ + "rdpr %%cwp, %%o5\n\t" \ + "stb %%o5, [%%g6 + %5]\n\t" \ + "mov %1, %%g6\n\t" \ + "ldub [%1 + %5], %%g1\n\t" \ + "wrpr %%g1, %%cwp\n\t" \ + "ldx [%%g6 + %3], %%o6\n\t" \ + "ldub [%%g6 + %2], %%o5\n\t" \ + "ldx [%%g6 + %4], %%o7\n\t" \ + "mov %%g6, %%l2\n\t" \ + "wrpr %%o5, 0x0, %%wstate\n\t" \ + "ldx [%%sp + 2047 + 0x70], %%i6\n\t" \ + "ldx [%%sp + 2047 + 0x78], %%i7\n\t" \ + "wrpr %%g0, 0x94, %%pstate\n\t" \ + "mov %%l2, %%g6\n\t" \ + "ldx [%%g6 + %7], %%g4\n\t" \ + "wrpr %%g0, 0x96, %%pstate\n\t" \ + "andcc %%o7, %6, %%g0\n\t" \ + "beq,pt %%icc, 1f\n\t" \ + " mov %%g7, %0\n\t" \ + "b,a ret_from_syscall\n\t" \ + "1:\n\t" \ + : "=&r" (last) \ + : "0" (next->thread_info), \ + "i" (TI_WSTATE), "i" (TI_KSP), "i" (TI_FLAGS), "i" (TI_CWP), \ + "i" (_TIF_NEWCHILD), "i" (TI_TASK) \ + : "cc", \ + "g1", "g2", "g3", "g7", \ + "l2", "l3", "l4", "l5", "l6", "l7", \ + "i0", "i1", "i2", "i3", "i4", "i5", \ + "o0", "o1", "o2", "o3", "o4", "o5", "o7" EXTRA_CLOBBER);\ + /* If you fuck with this, update ret_from_syscall code too. */ \ + if (test_thread_flag(TIF_PERFCTR)) { \ + write_pcr(current_thread_info()->pcr_reg); \ + reset_pic(); \ + } \ +} while(0) + +static inline unsigned long xchg32(__volatile__ unsigned int *m, unsigned int val) +{ + unsigned long tmp1, tmp2; + + __asm__ __volatile__( +" membar #StoreLoad | #LoadLoad\n" +" mov %0, %1\n" +"1: lduw [%4], %2\n" +" cas [%4], %2, %0\n" +" cmp %2, %0\n" +" bne,a,pn %%icc, 1b\n" +" mov %1, %0\n" +" membar #StoreLoad | #StoreStore\n" + : "=&r" (val), "=&r" (tmp1), "=&r" (tmp2) + : "0" (val), "r" (m) + : "cc", "memory"); + return val; +} + +static inline unsigned long xchg64(__volatile__ unsigned long *m, unsigned long val) +{ + unsigned long tmp1, tmp2; + + __asm__ __volatile__( +" membar #StoreLoad | #LoadLoad\n" +" mov %0, %1\n" +"1: ldx [%4], %2\n" +" casx [%4], %2, %0\n" +" cmp %2, %0\n" +" bne,a,pn %%xcc, 1b\n" +" mov %1, %0\n" +" membar #StoreLoad | #StoreStore\n" + : "=&r" (val), "=&r" (tmp1), "=&r" (tmp2) + : "0" (val), "r" (m) + : "cc", "memory"); + return val; +} + +#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) +#define tas(ptr) (xchg((ptr),1)) + +extern void __xchg_called_with_bad_pointer(void); + +static __inline__ unsigned long __xchg(unsigned long x, __volatile__ void * ptr, + int size) +{ + switch (size) { + case 4: + return xchg32(ptr, x); + case 8: + return xchg64(ptr, x); + }; + __xchg_called_with_bad_pointer(); + return x; +} + +extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn)); + +/* + * Atomic compare and exchange. Compare OLD with MEM, if identical, + * store NEW in MEM. Return the initial value in MEM. Success is + * indicated by comparing RETURN with OLD. + */ + +#define __HAVE_ARCH_CMPXCHG 1 + +static __inline__ unsigned long +__cmpxchg_u32(volatile int *m, int old, int new) +{ + __asm__ __volatile__("membar #StoreLoad | #LoadLoad\n" + "cas [%2], %3, %0\n\t" + "membar #StoreLoad | #StoreStore" + : "=&r" (new) + : "0" (new), "r" (m), "r" (old) + : "memory"); + + return new; +} + +static __inline__ unsigned long +__cmpxchg_u64(volatile long *m, unsigned long old, unsigned long new) +{ + __asm__ __volatile__("membar #StoreLoad | #LoadLoad\n" + "casx [%2], %3, %0\n\t" + "membar #StoreLoad | #StoreStore" + : "=&r" (new) + : "0" (new), "r" (m), "r" (old) + : "memory"); + + return new; +} + +/* This function doesn't exist, so you'll get a linker error + if something tries to do an invalid cmpxchg(). */ +extern void __cmpxchg_called_with_bad_pointer(void); + +static __inline__ unsigned long +__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) +{ + switch (size) { + case 4: + return __cmpxchg_u32(ptr, old, new); + case 8: + return __cmpxchg_u64(ptr, old, new); + } + __cmpxchg_called_with_bad_pointer(); + return old; +} + +#define cmpxchg(ptr,o,n) \ + ({ \ + __typeof__(*(ptr)) _o_ = (o); \ + __typeof__(*(ptr)) _n_ = (n); \ + (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ + (unsigned long)_n_, sizeof(*(ptr))); \ + }) + +#endif /* !(__ASSEMBLY__) */ + +#define arch_align_stack(x) (x) + +#endif /* !(__SPARC64_SYSTEM_H) */ |