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Diffstat (limited to 'include/asm-mips/processor.h')
| -rw-r--r-- | include/asm-mips/processor.h | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/include/asm-mips/processor.h b/include/asm-mips/processor.h new file mode 100644 index 0000000..8c3de90 --- /dev/null +++ b/include/asm-mips/processor.h @@ -0,0 +1,283 @@ +/* + * 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 Ralf Baechle + * Copyright (C) 1996 Paul M. Antoine + * Copyright (C) 1999 Silicon Graphics, Inc. + */ +#ifndef _ASM_PROCESSOR_H +#define _ASM_PROCESSOR_H + +#include <linux/config.h> + +#include <asm/isadep.h> + +/* + * Default implementation of macro that returns current + * instruction pointer ("program counter"). + */ +#define current_text_addr() ({ __label__ _l; _l: &&_l;}) + +#if !defined (_LANGUAGE_ASSEMBLY) +#if 0 +#include <linux/threads.h> +#endif +#include <asm/cachectl.h> +#include <asm/mipsregs.h> +#include <asm/reg.h> +#include <asm/system.h> + +struct mips_cpuinfo { + unsigned long udelay_val; + unsigned long *pgd_quick; + unsigned long *pte_quick; + unsigned long pgtable_cache_sz; +}; + +/* + * System setup and hardware flags.. + * XXX: Should go into mips_cpuinfo. + */ +extern void (*cpu_wait)(void); /* only available on R4[26]00 and R3081 */ +extern void r3081_wait(void); +extern void r4k_wait(void); +extern char cyclecounter_available; /* only available from R4000 upwards. */ + +extern struct mips_cpuinfo boot_cpu_data; +extern unsigned int vced_count, vcei_count; + +#ifdef CONFIG_SMP +extern struct mips_cpuinfo cpu_data[]; +#define current_cpu_data cpu_data[smp_processor_id()] +#else +#define cpu_data &boot_cpu_data +#define current_cpu_data boot_cpu_data +#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; + +/* + * 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; + + /* + * These are really only needed if the full FPU emulator is configured. + * Would be made conditional on MIPS_FPU_EMULATOR if it weren't for the + * fact that having offset.h rebuilt differently for different config + * options would be asking for trouble. + * + * Saved EPC during delay-slot emulation (see math-emu/cp1emu.c) + */ + unsigned long dsemul_epc; + + /* + * Pointer to instruction used to induce address error + */ + unsigned long dsemul_aerpc; +}; + +#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, \ + /* \ + * dsemul_epc and dsemul_aerpc should never be used uninitialized, \ + * but... \ + */ \ + 0 ,0 \ +} + +#ifdef __KERNEL__ + +#define KERNEL_STACK_SIZE 8192 + +#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. + */ +extern 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; + + return ((unsigned long *)t->reg29)[10]; +} + +/* + * Do necessary setup to start up a newly executed thread. + */ +#define start_thread(regs, new_pc, new_sp) do { \ + /* New thread looses kernel privileges. */ \ + regs->cp0_status = (regs->cp0_status & ~(ST0_CU0|ST0_KSU)) | KU_USER;\ + regs->cp0_epc = new_pc; \ + regs->regs[29] = new_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,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() 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. + * + * __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 */ |