284 lines
7.7 KiB
C
284 lines
7.7 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994 Waldorf GMBH
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* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2001 Ralf Baechle
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* Copyright (C) 1996 Paul M. Antoine
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* Copyright (C) 1999 Silicon Graphics, Inc.
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*/
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#ifndef _ASM_PROCESSOR_H
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#define _ASM_PROCESSOR_H
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#include <linux/config.h>
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#include <asm/isadep.h>
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#define current_text_addr() ({ __label__ _l; _l: &&_l;})
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#if !defined (_LANGUAGE_ASSEMBLY)
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#if 0
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#include <linux/threads.h>
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#endif
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#include <asm/cachectl.h>
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#include <asm/mipsregs.h>
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#include <asm/reg.h>
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#include <asm/system.h>
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struct mips_cpuinfo {
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unsigned long udelay_val;
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unsigned long *pgd_quick;
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unsigned long *pte_quick;
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unsigned long pgtable_cache_sz;
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};
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/*
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* System setup and hardware flags..
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* XXX: Should go into mips_cpuinfo.
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*/
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extern void (*cpu_wait)(void); /* only available on R4[26]00 and R3081 */
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extern void r3081_wait(void);
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extern void r4k_wait(void);
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extern char cyclecounter_available; /* only available from R4000 upwards. */
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extern struct mips_cpuinfo boot_cpu_data;
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extern unsigned int vced_count, vcei_count;
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#ifdef CONFIG_SMP
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extern struct mips_cpuinfo cpu_data[];
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#define current_cpu_data cpu_data[smp_processor_id()]
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#else
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#define cpu_data &boot_cpu_data
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#define current_cpu_data boot_cpu_data
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#endif
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/*
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* Bus types (default is ISA, but people can check others with these..)
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* MCA_bus hardcoded to 0 for now.
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*
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* This needs to be extended since MIPS systems are being delivered with
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* numerous different types of bus systems.
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*/
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extern int EISA_bus;
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#define MCA_bus 0
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#define MCA_bus__is_a_macro /* for versions in ksyms.c */
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/*
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* MIPS has no problems with write protection
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*/
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#define wp_works_ok 1
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#define wp_works_ok__is_a_macro /* for versions in ksyms.c */
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/* Lazy FPU handling on uni-processor */
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extern struct task_struct *last_task_used_math;
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/*
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* User space process size: 2GB. This is hardcoded into a few places,
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* so don't change it unless you know what you are doing. TASK_SIZE
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* for a 64 bit kernel expandable to 8192EB, of which the current MIPS
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* implementations will "only" be able to use 1TB ...
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*/
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#define TASK_SIZE (0x7fff8000UL)
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/* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
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/*
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* Size of io_bitmap in longwords: 32 is ports 0-0x3ff.
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*/
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#define IO_BITMAP_SIZE 32
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#define NUM_FPU_REGS 32
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struct mips_fpu_hard_struct {
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double fp_regs[NUM_FPU_REGS];
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unsigned int control;
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};
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/*
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* It would be nice to add some more fields for emulator statistics, but there
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* are a number of fixed offsets in offset.h and elsewhere that would have to
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* be recalculated by hand. So the additional information will be private to
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* the FPU emulator for now. See asm-mips/fpu_emulator.h.
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*/
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typedef u64 fpureg_t;
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struct mips_fpu_soft_struct {
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fpureg_t regs[NUM_FPU_REGS];
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unsigned int sr;
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};
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union mips_fpu_union {
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struct mips_fpu_hard_struct hard;
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struct mips_fpu_soft_struct soft;
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};
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#define INIT_FPU { \
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{{0,},} \
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}
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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/*
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* If you change thread_struct remember to change the #defines below too!
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*/
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struct thread_struct {
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/* Saved main processor registers. */
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unsigned long reg16;
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unsigned long reg17, reg18, reg19, reg20, reg21, reg22, reg23;
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unsigned long reg29, reg30, reg31;
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/* Saved cp0 stuff. */
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unsigned long cp0_status;
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/* Saved fpu/fpu emulator stuff. */
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union mips_fpu_union fpu;
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/* Other stuff associated with the thread. */
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unsigned long cp0_badvaddr; /* Last user fault */
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unsigned long cp0_baduaddr; /* Last kernel fault accessing USEG */
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unsigned long error_code;
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unsigned long trap_no;
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#define MF_FIXADE 1 /* Fix address errors in software */
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#define MF_LOGADE 2 /* Log address errors to syslog */
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unsigned long mflags;
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mm_segment_t current_ds;
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unsigned long irix_trampoline; /* Wheee... */
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unsigned long irix_oldctx;
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/*
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* These are really only needed if the full FPU emulator is configured.
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* Would be made conditional on MIPS_FPU_EMULATOR if it weren't for the
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* fact that having offset.h rebuilt differently for different config
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* options would be asking for trouble.
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*
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* Saved EPC during delay-slot emulation (see math-emu/cp1emu.c)
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*/
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unsigned long dsemul_epc;
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/*
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* Pointer to instruction used to induce address error
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*/
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unsigned long dsemul_aerpc;
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};
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#endif /* !defined (_LANGUAGE_ASSEMBLY) */
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#define INIT_THREAD { \
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/* \
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* saved main processor registers \
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*/ \
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0, 0, 0, 0, 0, 0, 0, 0, \
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0, 0, 0, \
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/* \
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* saved cp0 stuff \
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*/ \
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0, \
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/* \
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* saved fpu/fpu emulator stuff \
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*/ \
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INIT_FPU, \
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/* \
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* Other stuff associated with the process \
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*/ \
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0, 0, 0, 0, \
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/* \
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* For now the default is to fix address errors \
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*/ \
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MF_FIXADE, { 0 }, 0, 0, \
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/* \
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* dsemul_epc and dsemul_aerpc should never be used uninitialized, \
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* but... \
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*/ \
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0 ,0 \
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}
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#ifdef __KERNEL__
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#define KERNEL_STACK_SIZE 8192
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#if !defined (_LANGUAGE_ASSEMBLY)
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/* Free all resources held by a thread. */
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#define release_thread(thread) do { } while(0)
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extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
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/* Copy and release all segment info associated with a VM */
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#define copy_segments(p, mm) do { } while(0)
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#define release_segments(mm) do { } while(0)
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/*
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* Return saved PC of a blocked thread.
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*/
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extern inline unsigned long thread_saved_pc(struct thread_struct *t)
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{
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extern void ret_from_fork(void);
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/* New born processes are a special case */
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if (t->reg31 == (unsigned long) ret_from_fork)
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return t->reg31;
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return ((unsigned long *)t->reg29)[10];
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}
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/*
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* Do necessary setup to start up a newly executed thread.
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*/
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#define start_thread(regs, new_pc, new_sp) do { \
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/* New thread looses kernel privileges. */ \
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regs->cp0_status = (regs->cp0_status & ~(ST0_CU0|ST0_KSU)) | KU_USER;\
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regs->cp0_epc = new_pc; \
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regs->regs[29] = new_sp; \
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current->thread.current_ds = USER_DS; \
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} while (0)
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unsigned long get_wchan(struct task_struct *p);
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#define __PT_REG(reg) ((long)&((struct pt_regs *)0)->reg - sizeof(struct pt_regs))
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#define __KSTK_TOS(tsk) ((unsigned long)(tsk) + KERNEL_STACK_SIZE - 32)
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#define KSTK_EIP(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(cp0_epc)))
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#define KSTK_ESP(tsk) (*(unsigned long *)(__KSTK_TOS(tsk) + __PT_REG(regs[29])))
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/* Allocation and freeing of basic task resources. */
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/*
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* NOTE! The task struct and the stack go together
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*/
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#define THREAD_SIZE (2*PAGE_SIZE)
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#define alloc_task_struct() \
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((struct task_struct *) __get_free_pages(GFP_KERNEL,1))
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#define free_task_struct(p) free_pages((unsigned long)(p),1)
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#define get_task_struct(tsk) atomic_inc(&virt_to_page(tsk)->count)
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#define init_task (init_task_union.task)
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#define init_stack (init_task_union.stack)
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#define cpu_relax() do { } while (0)
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#endif /* !defined (_LANGUAGE_ASSEMBLY) */
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#endif /* __KERNEL__ */
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/*
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* Return_address is a replacement for __builtin_return_address(count)
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* which on certain architectures cannot reasonably be implemented in GCC
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* (MIPS, Alpha) or is unuseable with -fomit-frame-pointer (i386).
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* Note that __builtin_return_address(x>=1) is forbidden because GCC
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* aborts compilation on some CPUs. It's simply not possible to unwind
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* some CPU's stackframes.
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*
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* __builtin_return_address works only for non-leaf functions. We avoid the
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* overhead of a function call by forcing the compiler to save the return
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* address register on the stack.
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*/
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#define return_address() ({__asm__ __volatile__("":::"$31");__builtin_return_address(0);})
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#endif /* _ASM_PROCESSOR_H */
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