system.h
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- /* $Id: system.h,v 1.68 2001/11/18 00:12:56 davem Exp $ */
- #ifndef __SPARC64_SYSTEM_H
- #define __SPARC64_SYSTEM_H
- #include <linux/config.h>
- #include <asm/ptrace.h>
- #include <asm/processor.h>
- #include <asm/asm_offsets.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 __cli()
- __asm__ __volatile__("wrpr 15, %%pil" : : : "memory")
- #define __sti()
- __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, %0nt"
- "wrpr %1, %%pil"
- : "=&r" (retval)
- : "r" (__new_pil)
- : "memory");
- retval;
- })
- #define read_pil_and_cli()
- ({ unsigned long retval;
- __asm__ __volatile__("rdpr %%pil, %0nt"
- "wrpr 15, %%pil"
- : "=r" (retval)
- : : "memory");
- retval;
- })
- #define __save_flags(flags) ((flags) = getipl())
- #define __save_and_cli(flags) ((flags) = read_pil_and_cli())
- #define __restore_flags(flags) setipl((flags))
- #define local_irq_disable() __cli()
- #define local_irq_enable() __sti()
- #define local_irq_save(flags) __save_and_cli(flags)
- #define local_irq_restore(flags) __restore_flags(flags)
- #ifndef CONFIG_SMP
- #define cli() __cli()
- #define sti() __sti()
- #define save_flags(x) __save_flags(x)
- #define restore_flags(x) __restore_flags(x)
- #define save_and_cli(x) __save_and_cli(x)
- #else
- #ifndef __ASSEMBLY__
- extern void __global_cli(void);
- extern void __global_sti(void);
- extern unsigned long __global_save_flags(void);
- extern void __global_restore_flags(unsigned long flags);
- #endif
- #define cli() __global_cli()
- #define sti() __global_sti()
- #define save_flags(x) ((x) = __global_save_flags())
- #define restore_flags(flags) __global_restore_flags(flags)
- #define save_and_cli(flags) do { save_flags(flags); cli(); } while(0)
- #endif
- #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 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()
- #else
- #define smp_mb() __asm__ __volatile__("":::"memory");
- #define smp_rmb() __asm__ __volatile__("":::"memory");
- #define smp_wmb() __asm__ __volatile__("":::"memory");
- #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, 99fnt"
- ".align 64n"
- "99:wr %g0, 0x0, %picnt"
- "rd %pic, %g0")
- #ifndef __ASSEMBLY__
- 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_to_switch flushw_all
- #ifndef CONFIG_DEBUG_SPINLOCk
- #define CHECK_LOCKS(PREV) do { } while(0)
- #else /* CONFIG_DEBUG_SPINLOCk */
- #define CHECK_LOCKS(PREV)
- if ((PREV)->thread.smp_lock_count) {
- unsigned long rpc;
- __asm__ __volatile__("mov %%i7, %0" : "=r" (rpc));
- printk(KERN_CRIT "(%s)[%d]: Sleeping with %d locks held!n",
- (PREV)->comm, (PREV)->pid,
- (PREV)->thread.smp_lock_count);
- printk(KERN_CRIT "(%s)[%d]: Last lock at %08xn",
- (PREV)->comm, (PREV)->pid,
- (PREV)->thread.smp_lock_pc);
- printk(KERN_CRIT "(%s)[%d]: Sched caller %016lxn",
- (PREV)->comm, (PREV)->pid, rpc);
- }
- #endif /* !(CONFIG_DEBUG_SPINLOCk) */
- /* 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
- */
- #define switch_to(prev, next, last)
- do { CHECK_LOCKS(prev);
- if (current->thread.flags & SPARC_FLAG_PERFCTR) {
- unsigned long __tmp;
- read_pcr(__tmp);
- current->thread.pcr_reg = __tmp;
- read_pic(__tmp);
- current->thread.kernel_cntd0 += (unsigned int)(__tmp);
- current->thread.kernel_cntd1 += ((__tmp) >> 32);
- }
- 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" (next->thread.current_ds.seg));
- __asm__ __volatile__(
- "mov %%g6, %%g5nt"
- "wrpr %%g0, 0x95, %%pstatent"
- "stx %%i6, [%%sp + 2047 + 0x70]nt"
- "stx %%i7, [%%sp + 2047 + 0x78]nt"
- "rdpr %%wstate, %%o5nt"
- "stx %%o6, [%%g6 + %3]nt"
- "stb %%o5, [%%g6 + %2]nt"
- "rdpr %%cwp, %%o5nt"
- "stb %%o5, [%%g6 + %5]nt"
- "mov %1, %%g6nt"
- "ldub [%1 + %5], %%g1nt"
- "wrpr %%g1, %%cwpnt"
- "ldx [%%g6 + %3], %%o6nt"
- "ldub [%%g6 + %2], %%o5nt"
- "ldub [%%g6 + %4], %%o7nt"
- "mov %%g6, %%l2nt"
- "wrpr %%o5, 0x0, %%wstatent"
- "ldx [%%sp + 2047 + 0x70], %%i6nt"
- "ldx [%%sp + 2047 + 0x78], %%i7nt"
- "wrpr %%g0, 0x94, %%pstatent"
- "mov %%l2, %%g6nt"
- "wrpr %%g0, 0x96, %%pstatent"
- "andcc %%o7, %6, %%g0nt"
- "bne,pn %%icc, ret_from_syscallnt"
- " mov %%g5, %0nt"
- : "=&r" (last)
- : "r" (next),
- "i" ((const unsigned long)(&((struct task_struct *)0)->thread.wstate)),
- "i" ((const unsigned long)(&((struct task_struct *)0)->thread.ksp)),
- "i" ((const unsigned long)(&((struct task_struct *)0)->thread.flags)),
- "i" ((const unsigned long)(&((struct task_struct *)0)->thread.cwp)),
- "i" (SPARC_FLAG_NEWCHILD)
- : "cc", "g1", "g2", "g3", "g5", "g7",
- "l2", "l3", "l4", "l5", "l6", "l7",
- "i0", "i1", "i2", "i3", "i4", "i5",
- "o0", "o1", "o2", "o3", "o4", "o5", "o7");
- /* If you fuck with this, update ret_from_syscall code too. */
- if (current->thread.flags & SPARC_FLAG_PERFCTR) {
- write_pcr(current->thread.pcr_reg);
- reset_pic();
- }
- } while(0)
- extern __inline__ unsigned long xchg32(__volatile__ unsigned int *m, unsigned int val)
- {
- __asm__ __volatile__(
- " mov %0, %%g5n"
- "1: lduw [%2], %%g7n"
- " cas [%2], %%g7, %0n"
- " cmp %%g7, %0n"
- " bne,a,pn %%icc, 1bn"
- " mov %%g5, %0n"
- " membar #StoreLoad | #StoreStoren"
- : "=&r" (val)
- : "0" (val), "r" (m)
- : "g5", "g7", "cc", "memory");
- return val;
- }
- extern __inline__ unsigned long xchg64(__volatile__ unsigned long *m, unsigned long val)
- {
- __asm__ __volatile__(
- " mov %0, %%g5n"
- "1: ldx [%2], %%g7n"
- " casx [%2], %%g7, %0n"
- " cmp %%g7, %0n"
- " bne,a,pn %%xcc, 1bn"
- " mov %%g5, %0n"
- " membar #StoreLoad | #StoreStoren"
- : "=&r" (val)
- : "0" (val), "r" (m)
- : "g5", "g7", "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
- extern __inline__ unsigned long
- __cmpxchg_u32(volatile int *m, int old, int new)
- {
- __asm__ __volatile__("cas [%2], %3, %0nt"
- "membar #StoreLoad | #StoreStore"
- : "=&r" (new)
- : "0" (new), "r" (m), "r" (old)
- : "memory");
- return new;
- }
- extern __inline__ unsigned long
- __cmpxchg_u64(volatile long *m, unsigned long old, unsigned long new)
- {
- __asm__ __volatile__("casx [%2], %3, %0nt"
- "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__) */
- #endif /* !(__SPARC64_SYSTEM_H) */