/* $Id: system.h,v 1.86 2001/10/30 04:57:10 davem Exp $ */ #ifndef __SPARC_SYSTEM_H #define __SPARC_SYSTEM_H #include <linux/kernel.h> #include <linux/threads.h> /* NR_CPUS */ #include <linux/thread_info.h> #include <asm/page.h> #include <asm/psr.h> #include <asm/ptrace.h> #include <asm/btfixup.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 */ }; /* Really, userland should not be looking at any of this... */ #ifdef __KERNEL__ extern enum sparc_cpu sparc_cpu_model; #ifndef CONFIG_SUN4 #define ARCH_SUN4C_SUN4 (sparc_cpu_model==sun4c) #define ARCH_SUN4 0 #else #define ARCH_SUN4C_SUN4 1 #define ARCH_SUN4 1 #endif #define SUN4M_NCPUS 4 /* Architectural limit of sun4m. */ extern struct thread_info *current_set[NR_CPUS]; extern unsigned long empty_bad_page; extern unsigned long empty_bad_page_table; extern unsigned long empty_zero_page; 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; } /* When a context switch happens we must flush all user windows so that * the windows of the current process are flushed onto its stack. This * way the windows are all clean for the next process and the stack * frames are up to date. */ extern void flush_user_windows(void); extern void kill_user_windows(void); extern void synchronize_user_stack(void); extern void fpsave(unsigned long *fpregs, unsigned long *fsr, void *fpqueue, unsigned long *fpqdepth); #ifdef CONFIG_SMP #define SWITCH_ENTER(prv) \ do { \ if (test_tsk_thread_flag(prv, TIF_USEDFPU)) { \ put_psr(get_psr() | PSR_EF); \ fpsave(&(prv)->thread.float_regs[0], &(prv)->thread.fsr, \ &(prv)->thread.fpqueue[0], &(prv)->thread.fpqdepth); \ clear_tsk_thread_flag(prv, TIF_USEDFPU); \ (prv)->thread.kregs->psr &= ~PSR_EF; \ } \ } while(0) #define SWITCH_DO_LAZY_FPU(next) /* */ #else #define SWITCH_ENTER(prv) /* */ #define SWITCH_DO_LAZY_FPU(nxt) \ do { \ if (last_task_used_math != (nxt)) \ (nxt)->thread.kregs->psr&=~PSR_EF; \ } while(0) #endif /* * Flush windows so that the VM switch which follows * would not pull the stack from under us. * * SWITCH_ENTER and SWITH_DO_LAZY_FPU do not work yet (e.g. SMP does not work) * XXX WTF is the above comment? Found in late teen 2.4.x. */ #define prepare_arch_switch(next) do { \ __asm__ __volatile__( \ ".globl\tflush_patch_switch\nflush_patch_switch:\n\t" \ "save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \ "save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \ "save %sp, -0x40, %sp\n\t" \ "restore; restore; restore; restore; restore; restore; restore"); \ } while(0) /* Much care has gone into this code, do not touch it. * * We need to loadup regs l0/l1 for the newly forked child * case because the trap return path relies on those registers * holding certain values, gcc is told that they are clobbered. * Gcc needs registers for 3 values in and 1 value out, so we * clobber every non-fixed-usage register besides l2/l3/o4/o5. -DaveM * * Hey Dave, that do not touch sign is too much of an incentive * - Anton & Pete */ #define switch_to(prev, next, last) do { \ SWITCH_ENTER(prev); \ SWITCH_DO_LAZY_FPU(next); \ cpu_set(smp_processor_id(), next->active_mm->cpu_vm_mask); \ __asm__ __volatile__( \ "sethi %%hi(here - 0x8), %%o7\n\t" \ "mov %%g6, %%g3\n\t" \ "or %%o7, %%lo(here - 0x8), %%o7\n\t" \ "rd %%psr, %%g4\n\t" \ "std %%sp, [%%g6 + %4]\n\t" \ "rd %%wim, %%g5\n\t" \ "wr %%g4, 0x20, %%psr\n\t" \ "nop\n\t" \ "std %%g4, [%%g6 + %3]\n\t" \ "ldd [%2 + %3], %%g4\n\t" \ "mov %2, %%g6\n\t" \ ".globl patchme_store_new_current\n" \ "patchme_store_new_current:\n\t" \ "st %2, [%1]\n\t" \ "wr %%g4, 0x20, %%psr\n\t" \ "nop\n\t" \ "nop\n\t" \ "nop\n\t" /* LEON needs all 3 nops: load to %sp depends on CWP. */ \ "ldd [%%g6 + %4], %%sp\n\t" \ "wr %%g5, 0x0, %%wim\n\t" \ "ldd [%%sp + 0x00], %%l0\n\t" \ "ldd [%%sp + 0x38], %%i6\n\t" \ "wr %%g4, 0x0, %%psr\n\t" \ "nop\n\t" \ "nop\n\t" \ "jmpl %%o7 + 0x8, %%g0\n\t" \ " ld [%%g3 + %5], %0\n\t" \ "here:\n" \ : "=&r" (last) \ : "r" (&(current_set[hard_smp_processor_id()])), \ "r" (task_thread_info(next)), \ "i" (TI_KPSR), \ "i" (TI_KSP), \ "i" (TI_TASK) \ : "g1", "g2", "g3", "g4", "g5", "g7", \ "l0", "l1", "l3", "l4", "l5", "l6", "l7", \ "i0", "i1", "i2", "i3", "i4", "i5", \ "o0", "o1", "o2", "o3", "o7"); \ } while(0) /* * On SMP systems, when the scheduler does migration-cost autodetection, * it needs a way to flush as much of the CPU's caches as possible. * * TODO: fill this in! */ static inline void sched_cacheflush(void) { } /* * Changing the IRQ level on the Sparc. */ extern void local_irq_restore(unsigned long); extern unsigned long __local_irq_save(void); extern void local_irq_enable(void); static inline unsigned long getipl(void) { unsigned long retval; __asm__ __volatile__("rd %%psr, %0" : "=r" (retval)); return retval; } #define local_save_flags(flags) ((flags) = getipl()) #define local_irq_save(flags) ((flags) = __local_irq_save()) #define local_irq_disable() ((void) __local_irq_save()) #define irqs_disabled() ((getipl() & PSR_PIL) != 0) /* XXX Change this if we ever use a PSO mode kernel. */ #define mb() __asm__ __volatile__ ("" : : : "memory") #define rmb() mb() #define wmb() mb() #define read_barrier_depends() do { } while(0) #define set_mb(__var, __value) do { __var = __value; mb(); } while(0) #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) #define nop() __asm__ __volatile__ ("nop") /* This has special calling conventions */ #ifndef CONFIG_SMP BTFIXUPDEF_CALL(void, ___xchg32, void) #endif static inline unsigned long xchg_u32(__volatile__ unsigned long *m, unsigned long val) { #ifdef CONFIG_SMP __asm__ __volatile__("swap [%2], %0" : "=&r" (val) : "0" (val), "r" (m) : "memory"); return val; #else register unsigned long *ptr asm("g1"); register unsigned long ret asm("g2"); ptr = (unsigned long *) m; ret = val; /* Note: this is magic and the nop there is really needed. */ __asm__ __volatile__( "mov %%o7, %%g4\n\t" "call ___f____xchg32\n\t" " nop\n\t" : "=&r" (ret) : "0" (ret), "r" (ptr) : "g3", "g4", "g7", "memory", "cc"); return ret; #endif } #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 xchg_u32(ptr, x); }; __xchg_called_with_bad_pointer(); return x; } extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn)); #endif /* __KERNEL__ */ #endif /* __ASSEMBLY__ */ #define arch_align_stack(x) (x) #endif /* !(__SPARC_SYSTEM_H) */