FreeBSD/Linux Kernel Cross Reference
sys/include/asm-mips64/processor.h

     /*
      * This file is subject to the terms and conditions of the GNU General Public
      * License.  See the file "COPYING" in the main directory of this archive
      * for more details.
      *
      * Copyright (C) 1994 Waldorf GMBH
      * Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001, 2002, 2003 Ralf Baechle
      * Copyright (C) 1996 Paul M. Antoine
      * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
     */
    #ifndef _ASM_PROCESSOR_H
    #define _ASM_PROCESSOR_H
    
    #include <linux/config.h>
    #include <linux/cache.h>
    
    /*
     * Return current * instruction pointer ("program counter").
     */
    #define current_text_addr()                                             \
    ({                                                                      \
            void *_a;                                                       \
                                                                            \
            __asm__ ("bal\t1f\t\t\t# current_text_addr\n"                   \
                    "1:\tmove\t%0, $31"                                     \
                    : "=r" (_a)                                             \
                    :                                                       \
                    : "$31");                                               \
                                                                            \
            _a;                                                             \
    })
    
    #ifndef __ASSEMBLY__
    #include <linux/smp.h>
    
    #include <asm/cachectl.h>
    #include <asm/mipsregs.h>
    #include <asm/reg.h>
    #include <asm/system.h>
    
    #if defined(CONFIG_SGI_IP27)
    #include <asm/sn/types.h>
    #include <asm/sn/intr_public.h>
    #endif
    
    /*
     * Descriptor for a cache
     */
    struct cache_desc {
            unsigned short linesz;  /* Size of line in bytes */
            unsigned short ways;    /* Number of ways */
            unsigned short sets;    /* Number of lines per set */
            unsigned int waysize;   /* Bytes per way */
            unsigned int waybit;    /* Bits to select in a cache set */
            unsigned int flags;     /* Flags describing cache properties */
    };
    
    /*
     * Flag definitions
     */
    #define MIPS_CACHE_NOT_PRESENT  0x00000001
    #define MIPS_CACHE_VTAG         0x00000002      /* Virtually tagged cache */
    #define MIPS_CACHE_ALIASES      0x00000004      /* Cache could have aliases */
    #define MIPS_CACHE_IC_F_DC      0x00000008      /* Ic can refill from D-cache */
    
    struct cpuinfo_mips {
            unsigned long udelay_val;
            unsigned long *pgd_quick;
            unsigned long *pmd_quick;
            unsigned long *pte_quick;
            unsigned long pgtable_cache_sz;
            unsigned long asid_cache;
    #if defined(CONFIG_SGI_IP27)
            cpuid_t         p_cpuid;        /* PROM assigned cpuid */
            cnodeid_t       p_nodeid;       /* my node ID in compact-id-space */
            nasid_t         p_nasid;        /* my node ID in numa-as-id-space */
            unsigned char   p_slice;        /* Physical position on node board */
            hub_intmasks_t  p_intmasks;     /* SN0 per-CPU interrupt masks */
    #endif
    #if 0
            unsigned long loops_per_sec;
            unsigned long pgtable_cache_sz;
            unsigned long ipi_count;
            unsigned long irq_attempt[NR_IRQS];
            unsigned long smp_local_irq_count;
            unsigned long prof_multiplier;
            unsigned long prof_counter;
    #endif
    
            /*
             * Capability and feature descriptor structure for MIPS CPU
             */
            unsigned long options;
            unsigned int processor_id;
            unsigned int fpu_id;
            unsigned int cputype;
            int isa_level;
            int tlbsize;
            struct cache_desc icache;       /* Primary I-cache */
           struct cache_desc dcache;       /* Primary D or combined I/D cache */
           struct cache_desc scache;       /* Secondary cache */
           struct cache_desc tcache;       /* Tertiary/split secondary cache */
   } __attribute__((aligned(SMP_CACHE_BYTES)));
   
   /*
    * Assumption: Options of CPU 0 are a superset of all processors.
    * This is true for all known MIPS systems.
    */
   #define cpu_has_tlb             (cpu_data[0].options & MIPS_CPU_TLB)
   #define cpu_has_4kex            (cpu_data[0].options & MIPS_CPU_4KEX)
   #define cpu_has_4ktlb           (cpu_data[0].options & MIPS_CPU_4KTLB)
   #define cpu_has_fpu             (cpu_data[0].options & MIPS_CPU_FPU)
   #define cpu_has_32fpr           (cpu_data[0].options & MIPS_CPU_32FPR)
   #define cpu_has_counter         (cpu_data[0].options & MIPS_CPU_COUNTER)
   #define cpu_has_watch           (cpu_data[0].options & MIPS_CPU_WATCH)
   #define cpu_has_mips16          (cpu_data[0].options & MIPS_CPU_MIPS16)
   #define cpu_has_divec           (cpu_data[0].options & MIPS_CPU_DIVEC)
   #define cpu_has_vce             (cpu_data[0].options & MIPS_CPU_VCE)
   #define cpu_has_cache_cdex      (cpu_data[0].options & MIPS_CPU_CACHE_CDEX)
   #define cpu_has_mcheck          (cpu_data[0].options & MIPS_CPU_MCHECK)
   #define cpu_has_ejtag           (cpu_data[0].options & MIPS_CPU_EJTAG)
   #define cpu_has_nofpuex         (cpu_data[0].options & MIPS_CPU_NOFPUEX)
   #define cpu_has_llsc            (cpu_data[0].options & MIPS_CPU_LLSC)
   #define cpu_has_vtag_icache     (cpu_data[0].icache.flags & MIPS_CACHE_VTAG)
   #define cpu_has_dc_aliases      (cpu_data[0].dcache.flags & MIPS_CACHE_ALIASES)
   #define cpu_has_ic_fills_f_dc   (cpu_data[0].dcache.flags & MIPS_CACHE_IC_F_DC)
   #define cpu_has_64bits          1
   #define cpu_has_subset_pcaches  (cpu_data[0].options & MIPS_CPU_SUBSET_CACHES)
   
   extern struct cpuinfo_mips cpu_data[];
   #define current_cpu_data cpu_data[smp_processor_id()]
   
   extern void cpu_probe(void);
   extern void cpu_report(void);
   
   /*
    * System setup and hardware flags..
    */
   extern void (*cpu_wait)(void);
   
   extern unsigned int vced_count, vcei_count;
   
   /*
    * Bus types (default is ISA, but people can check others with these..)
    */
   #ifdef CONFIG_EISA
   extern int EISA_bus;
   #else
   #define EISA_bus (0)
   #endif
   
   #define MCA_bus 0
   #define MCA_bus__is_a_macro /* for versions in ksyms.c */
   
   /*
    * User space process size: 1TB. This is hardcoded into a few places,
    * so don't change it unless you know what you are doing.  TASK_SIZE
    * is limited to 1TB by the R4000 architecture; R10000 and better can
    * support 16TB.
    */
   #define TASK_SIZE32        0x7fff8000UL
   #define TASK_SIZE       0x10000000000UL
   
   /* This decides where the kernel will search for a free chunk of vm
    * space during mmap's.
    */
   #define TASK_UNMAPPED_BASE      ((current->thread.mflags & MF_32BIT_ADDR) ? \
           (TASK_SIZE32 / 3) : (TASK_SIZE / 3))
   
   /*
    * Size of io_bitmap in longwords: 32 is ports 0-0x3ff.
    */
   #define IO_BITMAP_SIZE  32
   
   #define NUM_FPU_REGS    32
   
   struct mips_fpu_hard_struct {
           unsigned long fp_regs[NUM_FPU_REGS];
           unsigned int control;
   };
   
   /*
    * It would be nice to add some more fields for emulator statistics, but there
    * are a number of fixed offsets in offset.h and elsewhere that would have to
    * be recalculated by hand.  So the additional information will be private to
    * the FPU emulator for now.  See asm-mips/fpu_emulator.h.
    */
   typedef u64 fpureg_t;
   struct mips_fpu_soft_struct {
           fpureg_t        regs[NUM_FPU_REGS];
           unsigned int    sr;
   };
   
   union mips_fpu_union {
           struct mips_fpu_hard_struct hard;
           struct mips_fpu_soft_struct soft;
   };
   
   #define INIT_FPU { \
           {{0,},} \
   }
   
   typedef struct {
           unsigned long seg;
   } mm_segment_t;
   
   /*
    * If you change thread_struct remember to change the #defines below too!
    */
   struct thread_struct {
           /* Saved main processor registers. */
           unsigned long reg16;
           unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
           unsigned long reg29, reg30, reg31;
   
           /* Saved cp0 stuff. */
           unsigned long cp0_status;
   
           /* Saved fpu/fpu emulator stuff. */
           union mips_fpu_union fpu;
   
           /* Other stuff associated with the thread. */
           unsigned long cp0_badvaddr;     /* Last user fault */
           unsigned long cp0_baduaddr;     /* Last kernel fault accessing USEG */
           unsigned long error_code;
           unsigned long trap_no;
   #define MF_FIXADE       1               /* Fix address errors in software */
   #define MF_LOGADE       2               /* Log address errors to syslog */
   #define MF_32BIT_REGS   4               /* also implies 16/32 fprs */
   #define MF_32BIT_ADDR   8               /* 32-bit address space (o32/n32) */
           unsigned long mflags;
           mm_segment_t current_ds;
           unsigned long irix_trampoline;  /* Wheee... */
           unsigned long irix_oldctx;
   };
   
   #define MF_ABI_MASK     (MF_32BIT_REGS | MF_32BIT_ADDR)
   #define MF_O32          (MF_32BIT_REGS | MF_32BIT_ADDR)
   #define MF_N32          MF_32BIT_ADDR
   #define MF_N64          0
   
   #endif /* !__ASSEMBLY__ */
   
   #define INIT_THREAD  { \
           /* \
            * saved main processor registers \
            */ \
           0, 0, 0, 0, 0, 0, 0, 0, \
                          0, 0, 0, \
           /* \
            * saved cp0 stuff \
            */ \
           0, \
           /* \
            * saved fpu/fpu emulator stuff \
            */ \
           INIT_FPU, \
           /* \
            * Other stuff associated with the process \
            */ \
           0, 0, 0, 0, \
           /* \
            * For now the default is to fix address errors \
            */ \
           MF_FIXADE, KERNEL_DS, 0, 0 \
   }
   
   #ifdef __KERNEL__
   
   #define KERNEL_STACK_SIZE       0x4000
   
   #ifndef __ASSEMBLY__
   
   /* Free all resources held by a thread. */
   #define release_thread(thread) do { } while(0)
   
   extern int arch_kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
   
   /* Copy and release all segment info associated with a VM */
   #define copy_segments(p, mm) do { } while(0)
   #define release_segments(mm) do { } while(0)
   
   struct mips_frame_info {
           int frame_offset;
           int pc_offset;
   };
   extern struct mips_frame_info schedule_frame;
   /*
    * Return saved PC of a blocked thread.
    */
   static inline unsigned long thread_saved_pc(struct thread_struct *t)
   {
           extern void ret_from_sys_call(void);
   
           /* New born processes are a special case */
           if (t->reg31 == (unsigned long) ret_from_sys_call)
                   return t->reg31;
   
           if (schedule_frame.pc_offset < 0)
                   return 0;
           return ((unsigned long *)t->reg29)[schedule_frame.pc_offset];
   }
   
   #define user_mode(regs) (((regs)->cp0_status & ST0_KSU) == KSU_USER)
   
   /*
    * Do necessary setup to start up a newly executed thread.
    */
   extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp);
   
   struct task_struct;
   unsigned long get_wchan(struct task_struct *p);
   
   #define __PT_REG(reg) ((long)&((struct pt_regs *)0)->reg - sizeof(struct pt_regs))
   #define __KSTK_TOS(tsk) ((unsigned long)(tsk) + KERNEL_STACK_SIZE - 32)
   #define KSTK_EIP(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(cp0_epc)))
   #define KSTK_ESP(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(regs[29])))
   #define KSTK_STATUS(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(cp0_status)))
   
   /* Allocation and freeing of basic task resources. */
   /*
    * NOTE! The task struct and the stack go together
    */
   #define THREAD_SIZE (2*PAGE_SIZE)
   #define alloc_task_struct() \
           ((struct task_struct *) __get_free_pages(GFP_KERNEL, 2))
   #define free_task_struct(p)     free_pages((unsigned long)(p), 2)
   #define get_task_struct(tsk)    atomic_inc(&virt_to_page(tsk)->count)
   
   #define init_task       (init_task_union.task)
   #define init_stack      (init_task_union.stack)
   
   #define cpu_relax()     barrier()
   
   #endif /* !__ASSEMBLY__ */
   #endif /* __KERNEL__ */
   
   /*
    * Return_address is a replacement for __builtin_return_address(count)
    * which on certain architectures cannot reasonably be implemented in GCC
    * (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
    * Note that __builtin_return_address(x>=1) is forbidden because GCC
    * aborts compilation on some CPUs.  It's simply not possible to unwind
    * some CPU's stackframes.
    *
    * __builtin_return_address works only for non-leaf functions.  We avoid the
    * overhead of a function call by forcing the compiler to save the return
    * address register on the stack.
    */
   #define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
   
   #endif /* _ASM_PROCESSOR_H */

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