/* * 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 #include #include /* * Return current * instruction pointer ("program counter"). */ #define current_text_addr() ({ __label__ _l; _l: &&_l;}) #ifndef __ASSEMBLY__ #include #include #include #include #include #include #include /* * 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 *pte_quick; unsigned long pgtable_cache_sz; unsigned long asid_cache; /* * 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_p (cpu_data[0].options & MIPS_CPU_CACHE_CDEX_P) #define cpu_has_cache_cdex_s (cpu_data[0].options & MIPS_CPU_CACHE_CDEX_S) #define cpu_has_prefetch (cpu_data[0].options & MIPS_CPU_PREFETCH) #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 (cpu_data[0].isa_level & MIPS_CPU_ISA_64BIT) #define cpu_has_64bit_zero_reg (cpu_data[0].isa_level & MIPS_CPU_ISA_64BIT) #define cpu_has_64bit_gp_regs 0 #define cpu_has_64bit_addresses 0 #define cpu_has_subset_pcaches (cpu_data[0].options & MIPS_CPU_SUBSET_CACHES) #define cpu_dcache_line_size() current_cpu_data.dcache.linesz #define cpu_icache_line_size() current_cpu_data.icache.linesz #define cpu_scache_line_size() current_cpu_data.scache.linesz 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: 2GB. This is hardcoded into a few places, * so don't change it unless you know what you are doing. TASK_SIZE * for a 64 bit kernel expandable to 8192EB, of which the current MIPS * implementations will "only" be able to use 1TB ... */ #define TASK_SIZE 0x7fff8000UL /* This decides where the kernel will search for a free chunk of vm * space during mmap's. */ #define TASK_UNMAPPED_BASE (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 { double 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 */ unsigned long mflags; mm_segment_t current_ds; unsigned long irix_trampoline; /* Wheee... */ unsigned long irix_oldctx; }; #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, { 0 }, 0, 0 \ } #ifdef __KERNEL__ #define KERNEL_STACK_SIZE 0x2000 #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_fork(void); /* New born processes are a special case */ if (t->reg31 == (unsigned long) ret_from_fork) return t->reg31; if (schedule_frame.pc_offset < 0) return 0; return ((unsigned long *)t->reg29)[schedule_frame.pc_offset]; } /* * 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_ORDER (PAGE_SHIFT >= 14 ? 0 : 1) #define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER) #define THREAD_MASK (THREAD_SIZE - 1UL) #define alloc_task_struct() \ ((struct task_struct *) __get_free_pages(GFP_KERNEL,1)) #define free_task_struct(p) free_pages((unsigned long)(p),1) #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 */