/* * 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, 2000 Ralf Baechle * Modified further for R[236]000 compatibility by Paul M. Antoine * Copyright (C) 1999, 2000 Silicon Graphics, Inc. */ #ifndef _ASM_PROCESSOR_H #define _ASM_PROCESSOR_H #include /* * Return current * instruction pointer ("program counter"). * * Two implementations. The ``la'' version results in shorter code for * the kernel which we assume to reside in the 32-bit compat address space. * The ``jal'' version is for use by modules which live in outer space. * This is just a single instruction unlike the long dla macro expansion. */ #ifdef MODULE #define current_text_addr() \ ({ \ void *_a; \ \ __asm__ ("jal\t1f, %0\n\t" \ "1:" \ : "=r" (_a)); \ \ _a; \ }) #else #define current_text_addr() \ ({ \ void *_a; \ \ __asm__ ("dla\t%0, 1f\n\t" \ "1:" \ : "=r" (_a)); \ \ _a; \ }) #endif #if !defined (_LANGUAGE_ASSEMBLY) #include #include #include #include #if (defined(CONFIG_SGI_IP27)) #include #include #endif 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 last_asn; 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 } __attribute__((aligned(128))); /* * System setup and hardware flags.. * XXX: Should go into mips_cpuinfo. */ extern void (*cpu_wait)(void); extern void r3081_wait(void); extern void r39xx_wait(void); extern void r4k_wait(void); extern unsigned int vced_count, vcei_count; extern struct cpuinfo_mips cpu_data[]; #ifdef CONFIG_SMP #define current_cpu_data cpu_data[smp_processor_id()] #else #define current_cpu_data cpu_data[0] #endif /* * Bus types (default is ISA, but people can check others with these..) * MCA_bus hardcoded to 0 for now. * * This needs to be extended since MIPS systems are being delivered with * numerous different types of bus systems. */ extern int EISA_bus; #define MCA_bus 0 #define MCA_bus__is_a_macro /* for versions in ksyms.c */ /* * MIPS has no problems with write protection */ #define wp_works_ok 1 #define wp_works_ok__is_a_macro /* for versions in ksyms.c */ /* Lazy FPU handling on uni-processor */ extern struct task_struct *last_task_used_math; #ifndef CONFIG_SMP #define IS_FPU_OWNER() (last_task_used_math == current) #define CLEAR_FPU_OWNER() last_task_used_math = NULL; #else #define IS_FPU_OWNER() (current->flags & PF_USEDFPU) #define CLEAR_FPU_OWNER() current->flags &= ~PF_USEDFPU; #endif /* * 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 0x80000000UL #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) ? \ (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 4 /* Process is in 32-bit compat mode */ unsigned long mflags; mm_segment_t current_ds; unsigned long irix_trampoline; /* Wheee... */ unsigned long irix_oldctx; }; #endif /* !defined (_LANGUAGE_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 0x4000 #if !defined (_LANGUAGE_ASSEMBLY) /* Free all resources held by a thread. */ #define release_thread(thread) do { } while(0) extern int 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) /* * 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; return ((unsigned long*)t->reg29)[11]; } #define user_mode(regs) (((regs)->cp0_status & ST0_KSU) == KSU_USER) /* * Do necessary setup to start up a newly executed thread. */ #define start_thread(regs, pc, sp) \ do { \ unsigned long __status; \ \ /* New thread looses kernel privileges. */ \ __status = regs->cp0_status & ~(ST0_CU0|ST0_FR|ST0_KSU); \ __status |= KSU_USER; \ __status |= (current->thread.mflags & MF_32BIT) ? 0 : ST0_FR; \ regs->cp0_status = __status; \ regs->cp0_epc = pc; \ regs->regs[29] = sp; \ current->thread.current_ds = USER_DS; \ } while(0) 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]))) /* 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() do { } while (0) #endif /* !defined (_LANGUAGE_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. * * In gcc 2.8 and newer __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 */