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- /* $Id: system.h,v 1.72 1999/01/02 16:50:21 davem Exp $ */
- #include <linux/config.h>
-
- #ifndef __SPARC_SYSTEM_H
- #define __SPARC_SYSTEM_H
-
- #include <linux/kernel.h>
-
- #include <asm/segment.h>
-
- #ifdef __KERNEL__
- #include <asm/page.h>
- #include <asm/oplib.h>
- #include <asm/psr.h>
- #include <asm/ptrace.h>
- #include <asm/btfixup.h>
-
- #define EMPTY_PGT (&empty_bad_page)
- #define EMPTY_PGE (&empty_bad_page_table)
- #endif /* __KERNEL__ */
-
- #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
-
- extern unsigned long empty_bad_page;
- extern unsigned long empty_bad_page_table;
- extern unsigned long empty_zero_page;
-
- extern struct linux_romvec *romvec;
- #define halt() romvec->pv_halt()
-
- /* 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 __SMP__
- #define SWITCH_ENTER \
- if(prev->flags & PF_USEDFPU) { \
- put_psr(get_psr() | PSR_EF); \
- fpsave(&prev->tss.float_regs[0], &prev->tss.fsr, \
- &prev->tss.fpqueue[0], &prev->tss.fpqdepth); \
- prev->flags &= ~PF_USEDFPU; \
- prev->tss.kregs->psr &= ~PSR_EF; \
- }
-
- #define SWITCH_DO_LAZY_FPU
- #else
- #define SWITCH_ENTER
- #define SWITCH_DO_LAZY_FPU if(last_task_used_math != next) next->tss.kregs->psr&=~PSR_EF;
- #endif
-
- /* Much care has gone into this code, do not touch it. */
- #define switch_to(prev, next) do { \
- __label__ here; \
- register unsigned long task_pc asm("o7"); \
- extern struct task_struct *current_set[NR_CPUS]; \
- SWITCH_ENTER \
- SWITCH_DO_LAZY_FPU \
- __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"); \
- if(!(next->tss.flags & SPARC_FLAG_KTHREAD) && \
- !(next->flags & PF_EXITING)) \
- switch_to_context(next); \
- next->mm->cpu_vm_mask |= (1 << smp_processor_id()); \
- task_pc = ((unsigned long) &&here) - 0x8; \
- __asm__ __volatile__( \
- "rd %%psr, %%g4\n\t" \
- "std %%sp, [%%g6 + %3]\n\t" \
- "rd %%wim, %%g5\n\t" \
- "wr %%g4, 0x20, %%psr\n\t" \
- "nop\n\t" \
- "std %%g4, [%%g6 + %2]\n\t" \
- "ldd [%1 + %2], %%g4\n\t" \
- "mov %1, %%g6\n\t" \
- ".globl patchme_store_new_current\n" \
- "patchme_store_new_current:\n\t" \
- "st %1, [%0]\n\t" \
- "wr %%g4, 0x20, %%psr\n\t" \
- "nop\n\t" \
- "nop\n\t" \
- "ldd [%%g6 + %3], %%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" \
- " nop\n\t" : : "r" (&(current_set[hard_smp_processor_id()])), "r" (next), \
- "i" ((const unsigned long)(&((struct task_struct *)0)->tss.kpsr)), \
- "i" ((const unsigned long)(&((struct task_struct *)0)->tss.ksp)), \
- "r" (task_pc) \
- : "g1", "g2", "g3", "g4", "g5", "g7", "l2", "l3", \
- "l4", "l5", "l6", "l7", "i0", "i1", "i2", "i3", "i4", "i5", "o0", "o1", "o2", \
- "o3"); \
- here: } while(0)
-
- /* Changing the IRQ level on the Sparc. We now avoid writing the psr
- * whenever possible.
- */
- extern __inline__ void setipl(unsigned long __orig_psr)
- {
- __asm__ __volatile__("
- wr %0, 0x0, %%psr
- nop; nop; nop
- " : /* no outputs */
- : "r" (__orig_psr)
- : "memory", "cc");
- }
-
- extern __inline__ void __cli(void)
- {
- unsigned long tmp;
-
- __asm__ __volatile__("
- rd %%psr, %0
- nop; nop; nop; /* Sun4m + Cypress + SMP bug */
- or %0, %1, %0
- wr %0, 0x0, %%psr
- nop; nop; nop
- " : "=r" (tmp)
- : "i" (PSR_PIL)
- : "memory");
- }
-
- extern __inline__ void __sti(void)
- {
- unsigned long tmp;
-
- __asm__ __volatile__("
- rd %%psr, %0
- nop; nop; nop; /* Sun4m + Cypress + SMP bug */
- andn %0, %1, %0
- wr %0, 0x0, %%psr
- nop; nop; nop
- " : "=r" (tmp)
- : "i" (PSR_PIL)
- : "memory");
- }
-
- extern __inline__ unsigned long getipl(void)
- {
- unsigned long retval;
-
- __asm__ __volatile__("rd %%psr, %0" : "=r" (retval));
- return retval;
- }
-
- extern __inline__ unsigned long swap_pil(unsigned long __new_psr)
- {
- unsigned long retval;
-
- __asm__ __volatile__("
- rd %%psr, %0
- nop; nop; nop; /* Sun4m + Cypress + SMP bug */
- and %0, %2, %%g1
- and %1, %2, %%g2
- xorcc %%g1, %%g2, %%g0
- be 1f
- nop
- wr %0, %2, %%psr
- nop; nop; nop;
- 1:
- " : "=r" (retval)
- : "r" (__new_psr), "i" (PSR_PIL)
- : "g1", "g2", "memory", "cc");
-
- return retval;
- }
-
- extern __inline__ unsigned long read_psr_and_cli(void)
- {
- unsigned long retval;
-
- __asm__ __volatile__("
- rd %%psr, %0
- nop; nop; nop; /* Sun4m + Cypress + SMP bug */
- or %0, %1, %%g1
- wr %%g1, 0x0, %%psr
- nop; nop; nop
- " : "=r" (retval)
- : "i" (PSR_PIL)
- : "g1", "memory");
-
- return retval;
- }
-
- #define __save_flags(flags) ((flags) = getipl())
- #define __save_and_cli(flags) ((flags) = read_psr_and_cli())
- #define __restore_flags(flags) setipl((flags))
-
- #ifdef __SMP__
-
- /* This goes away after lockups have been found... */
- #ifndef DEBUG_IRQLOCK
- #define DEBUG_IRQLOCK
- #endif
-
- extern unsigned char global_irq_holder;
-
- #define save_and_cli(flags) do { save_flags(flags); cli(); } while(0)
-
- #ifdef DEBUG_IRQLOCK
- 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);
- #define cli() __global_cli()
- #define sti() __global_sti()
- #define save_flags(flags) ((flags)=__global_save_flags())
- #define restore_flags(flags) __global_restore_flags(flags)
- #else
-
- #error For combined sun4[md] smp, we need to get rid of the rdtbr.
-
- /* Visit arch/sparc/lib/irqlock.S for all the fun details... */
- #define cli() __asm__ __volatile__("mov %%o7, %%g4\n\t" \
- "call ___f_global_cli\n\t" \
- " rd %%tbr, %%g7" : : \
- : "g1", "g2", "g3", "g4", "g5", "g7", \
- "memory", "cc")
-
- #define sti() \
- do { register unsigned long bits asm("g7"); \
- bits = 0; \
- __asm__ __volatile__("mov %%o7, %%g4\n\t" \
- "call ___f_global_sti\n\t" \
- " rd %%tbr, %%g2" \
- : /* no outputs */ \
- : "r" (bits) \
- : "g1", "g2", "g3", "g4", "g5", \
- "memory", "cc"); \
- } while(0)
-
- #define restore_flags(flags) \
- do { register unsigned long bits asm("g7"); \
- bits = flags; \
- __asm__ __volatile__("mov %%o7, %%g4\n\t" \
- "call ___f_global_restore_flags\n\t" \
- " andcc %%g7, 0x1, %%g0" \
- : "=&r" (bits) \
- : "0" (bits) \
- : "g1", "g2", "g3", "g4", "g5", \
- "memory", "cc"); \
- } while(0)
-
- #endif /* DEBUG_IRQLOCK */
-
- #else
-
- #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)
-
- #endif
-
- /* XXX Change this if we ever use a PSO mode kernel. */
- #define mb() __asm__ __volatile__ ("" : : : "memory")
- #define rmb() mb()
- #define wmb() mb()
-
- #define nop() __asm__ __volatile__ ("nop");
-
- /* This has special calling conventions */
- #ifndef __SMP__
- BTFIXUPDEF_CALL(void, ___xchg32, void)
- #endif
-
- extern __inline__ unsigned long xchg_u32(__volatile__ unsigned long *m, unsigned long val)
- {
- #ifdef __SMP__
- __asm__ __volatile__("swap [%2], %0"
- : "=&r" (val)
- : "0" (val), "r" (m));
- 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
- call ___f____xchg32
- nop
- " : "=&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__ */
-
- #endif /* !(__SPARC_SYSTEM_H) */
-