LXR linux-bk/include/asm-ppc/processor.h

   1#ifdef __KERNEL__
   2#ifndef __ASM_PPC_PROCESSOR_H
   3#define __ASM_PPC_PROCESSOR_H
   4
   5/*
   6 * Default implementation of macro that returns current
   7 * instruction pointer ("program counter").
   8 */
   9#define current_text_addr() ({ __label__ _l; _l: &&_l;})
  10
  11#include <linux/config.h>
  12#include <linux/stringify.h>
  13
  14#include <asm/ptrace.h>
  15#include <asm/types.h>
  16#include <asm/mpc8xx.h>
  17#include <asm/reg.h>
  18
  19/* We only need to define a new _MACH_xxx for machines which are part of
  20 * a configuration which supports more than one type of different machine.
  21 * This is currently limited to CONFIG_PPC_MULTIPLATFORM and CHRP/PReP/PMac.
  22 * -- Tom
  23 */
  24#define _MACH_prep      0x00000001
  25#define _MACH_Pmac      0x00000002      /* pmac or pmac clone (non-chrp) */
  26#define _MACH_chrp      0x00000004      /* chrp machine */
  27
  28/* see residual.h for these */
  29#define _PREP_Motorola  0x01    /* motorola prep */
  30#define _PREP_Firm      0x02    /* firmworks prep */
  31#define _PREP_IBM       0x00    /* ibm prep */
  32#define _PREP_Bull      0x03    /* bull prep */
  33
  34/* these are arbitrary */
  35#define _CHRP_Motorola  0x04    /* motorola chrp, the cobra */
  36#define _CHRP_IBM       0x05    /* IBM chrp, the longtrail and longtrail 2 */
  37
  38#define _GLOBAL(n)\
  39        .stabs __stringify(n:F-1),N_FUN,0,0,n;\
  40        .globl n;\
  41n:
  42
  43/*
  44 * this is the minimum allowable io space due to the location
  45 * of the io areas on prep (first one at 0x80000000) but
  46 * as soon as I get around to remapping the io areas with the BATs
  47 * to match the mac we can raise this. -- Cort
  48 */
  49#define TASK_SIZE       (CONFIG_TASK_SIZE)
  50
  51#ifndef __ASSEMBLY__
  52#ifdef CONFIG_PPC_MULTIPLATFORM
  53extern int _machine;
  54
  55/* what kind of prep workstation we are */
  56extern int _prep_type;
  57
  58/*
  59 * This is used to identify the board type from a given PReP board
  60 * vendor. Board revision is also made available.
  61 */
  62extern unsigned char ucSystemType;
  63extern unsigned char ucBoardRev;
  64extern unsigned char ucBoardRevMaj, ucBoardRevMin;
  65#else
  66#define _machine 0
  67#endif /* CONFIG_PPC_MULTIPLATFORM */
  68
  69struct task_struct;
  70void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
  71void release_thread(struct task_struct *);
  72
  73/* Prepare to copy thread state - unlazy all lazy status */
  74extern void prepare_to_copy(struct task_struct *tsk);
  75
  76/*
  77 * Create a new kernel thread.
  78 */
  79extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  80
  81/*
  82 * Bus types
  83 */
  84#define MCA_bus 0
  85#define MCA_bus__is_a_macro
  86
  87/* Lazy FPU handling on uni-processor */
  88extern struct task_struct *last_task_used_math;
  89extern struct task_struct *last_task_used_altivec;
  90extern struct task_struct *last_task_used_spe;
  91
  92/* This decides where the kernel will search for a free chunk of vm
  93 * space during mmap's.
  94 */
  95#define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
  96
  97typedef struct {
  98        unsigned long seg;
  99} mm_segment_t;
 100
 101struct thread_struct {
 102        unsigned long   ksp;            /* Kernel stack pointer */
 103        struct pt_regs  *regs;          /* Pointer to saved register state */
 104        mm_segment_t    fs;             /* for get_fs() validation */
 105        void            *pgdir;         /* root of page-table tree */
 106        int             fpexc_mode;     /* floating-point exception mode */
 107        signed long     last_syscall;
 108#if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
 109        unsigned long   dbcr0;          /* debug control register values */
 110        unsigned long   dbcr1;
 111#endif
 112        double          fpr[32];        /* Complete floating point set */
 113        unsigned long   fpscr_pad;      /* fpr ... fpscr must be contiguous */
 114        unsigned long   fpscr;          /* Floating point status */
 115#ifdef CONFIG_ALTIVEC
 116        /* Complete AltiVec register set */
 117        vector128       vr[32] __attribute((aligned(16)));
 118        /* AltiVec status */
 119        vector128       vscr __attribute((aligned(16)));
 120        unsigned long   vrsave;
 121        int             used_vr;        /* set if process has used altivec */
 122#endif /* CONFIG_ALTIVEC */
 123#ifdef CONFIG_SPE
 124        unsigned long   evr[32];        /* upper 32-bits of SPE regs */
 125        u64             acc;            /* Accumulator */
 126        unsigned long   spefscr;        /* SPE & eFP status */
 127        int             used_spe;       /* set if process has used spe */
 128#endif /* CONFIG_SPE */
 129};
 130
 131#define ARCH_MIN_TASKALIGN 16
 132
 133#define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 134
 135#define INIT_THREAD { \
 136        .ksp = INIT_SP, \
 137        .fs = KERNEL_DS, \
 138        .pgdir = swapper_pg_dir, \
 139        .fpexc_mode = MSR_FE0 | MSR_FE1, \
 140}
 141
 142/*
 143 * Return saved PC of a blocked thread. For now, this is the "user" PC
 144 */
 145#define thread_saved_pc(tsk)    \
 146        ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 147
 148unsigned long get_wchan(struct task_struct *p);
 149
 150#define KSTK_EIP(tsk)   ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 151#define KSTK_ESP(tsk)   ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 152
 153/* Get/set floating-point exception mode */
 154#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
 155#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
 156
 157extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 158extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 159
 160static inline unsigned int __unpack_fe01(unsigned int msr_bits)
 161{
 162        return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
 163}
 164
 165static inline unsigned int __pack_fe01(unsigned int fpmode)
 166{
 167        return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
 168}
 169
 170/* in process.c - for early bootup debug -- Cort */
 171int ll_printk(const char *, ...);
 172void ll_puts(const char *);
 173
 174/* In misc.c */
 175void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
 176
 177#define have_of (_machine == _MACH_chrp || _machine == _MACH_Pmac)
 178
 179#define cpu_relax()     barrier()
 180
 181/*
 182 * Prefetch macros.
 183 */
 184#define ARCH_HAS_PREFETCH
 185#define ARCH_HAS_PREFETCHW
 186#define ARCH_HAS_SPINLOCK_PREFETCH
 187
 188extern inline void prefetch(const void *x)
 189{
 190         __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
 191}
 192
 193extern inline void prefetchw(const void *x)
 194{
 195         __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
 196}
 197
 198#define spin_lock_prefetch(x)   prefetchw(x)
 199
 200extern int emulate_altivec(struct pt_regs *regs);
 201
 202#endif /* !__ASSEMBLY__ */
 203
 204#endif /* __ASM_PPC_PROCESSOR_H */
 205#endif /* __KERNEL__ */
 206