/* * 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/threads.h> #include <asm/cachectl.h> #include <asm/cpu.h> #include <asm/cpu-info.h> #include <asm/mipsregs.h> #include <asm/prefetch.h> #include <asm/system.h> /* * Return current * instruction pointer ("program counter"). */ #define current_text_addr() ({ __label__ _l; _l: &&_l;}) /* * System setup and hardware flags.. */ extern void (*cpu_wait)(void); extern unsigned int vced_count, vcei_count; #ifdef CONFIG_32BIT /* * User space process size: 2GB. This is hardcoded into a few places, * so don't change it unless you know what you are doing. */ #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 (PAGE_ALIGN(TASK_SIZE / 3)) #endif #ifdef CONFIG_64BIT /* * 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; the architectural reserve for future expansion is * 8192EB ... */ #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) ? \ PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3)) #endif #define NUM_FPU_REGS 32 typedef __u64 fpureg_t; struct mips_fpu_hard_struct { fpureg_t fpr[NUM_FPU_REGS]; unsigned int fcr31; }; /* * 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. */ struct mips_fpu_soft_struct { fpureg_t fpr[NUM_FPU_REGS]; unsigned int fcr31; }; union mips_fpu_union { struct mips_fpu_hard_struct hard; struct mips_fpu_soft_struct soft; }; #define INIT_FPU { \ {{0,},} \ } #define NUM_DSP_REGS 6 typedef __u32 dspreg_t; struct mips_dsp_state { dspreg_t dspr[NUM_DSP_REGS]; unsigned int dspcontrol; }; #define INIT_DSP {{0,},} typedef struct { unsigned long seg; } mm_segment_t; #define ARCH_MIN_TASKALIGN 8 struct mips_abi; /* * 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; /* Saved state of the DSP ASE, if available. */ struct mips_dsp_state dsp; /* 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; unsigned long irix_trampoline; /* Wheee... */ unsigned long irix_oldctx; struct mips_abi *abi; }; #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 #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, \ /* \ * saved dsp/dsp emulator stuff \ */ \ INIT_DSP, \ /* \ * Other stuff associated with the process \ */ \ 0, 0, 0, 0, \ /* \ * For now the default is to fix address errors \ */ \ MF_FIXADE, 0, 0 \ } struct task_struct; /* Free all resources held by a thread. */ #define release_thread(thread) do { } while(0) /* Prepare to copy thread state - unlazy all lazy status */ #define prepare_to_copy(tsk) do { } while (0) extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); extern unsigned long thread_saved_pc(struct task_struct *tsk); /* * Do necessary setup to start up a newly executed thread. */ extern void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp); unsigned long get_wchan(struct task_struct *p); #define __KSTK_TOS(tsk) ((unsigned long)task_stack_page(tsk) + THREAD_SIZE - 32) #define task_pt_regs(tsk) ((struct pt_regs *)__KSTK_TOS(tsk) - 1) #define KSTK_EIP(tsk) (task_pt_regs(tsk)->cp0_epc) #define KSTK_ESP(tsk) (task_pt_regs(tsk)->regs[29]) #define KSTK_STATUS(tsk) (task_pt_regs(tsk)->cp0_status) #define cpu_relax() barrier() /* * 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);}) #ifdef CONFIG_CPU_HAS_PREFETCH #define ARCH_HAS_PREFETCH extern inline void prefetch(const void *addr) { __asm__ __volatile__( " .set mips4 \n" " pref %0, (%1) \n" " .set mips0 \n" : : "i" (Pref_Load), "r" (addr)); } #endif #endif /* _ASM_PROCESSOR_H */