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 #define _CHRP_Pegasos   0x06    /* Genesi/bplan's Pegasos and Pegasos2 */
  38
  39 #define _GLOBAL(n)\
  40         .stabs __stringify(n:F-1),N_FUN,0,0,n;\
  41         .globl n;\
  42 n:
  43
  44 /*
  45  * this is the minimum allowable io space due to the location
  46  * of the io areas on prep (first one at 0x80000000) but
  47  * as soon as I get around to remapping the io areas with the BATs
  48  * to match the mac we can raise this. -- Cort
  49  */
  50 #define TASK_SIZE       (CONFIG_TASK_SIZE)
  51
  52 #ifndef __ASSEMBLY__
  53 #ifdef CONFIG_PPC_MULTIPLATFORM
  54 extern int _machine;
  55
  56 /* what kind of prep workstation we are */
  57 extern int _prep_type;
  58 extern int _chrp_type;
  59
  60 /*
  61  * This is used to identify the board type from a given PReP board
  62  * vendor. Board revision is also made available.
  63  */
  64 extern unsigned char ucSystemType;
  65 extern unsigned char ucBoardRev;
  66 extern unsigned char ucBoardRevMaj, ucBoardRevMin;
  67 #else
  68 #define _machine 0
  69 #endif /* CONFIG_PPC_MULTIPLATFORM */
  70
  71 struct task_struct;
  72 void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
  73 void release_thread(struct task_struct *);
  74
  75 /* Prepare to copy thread state - unlazy all lazy status */
  76 extern void prepare_to_copy(struct task_struct *tsk);
  77
  78 /*
  79  * Create a new kernel thread.
  80  */
  81 extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  82
  83 /* Lazy FPU handling on uni-processor */
  84 extern struct task_struct *last_task_used_math;
  85 extern struct task_struct *last_task_used_altivec;
  86 extern struct task_struct *last_task_used_spe;
  87
  88 /* This decides where the kernel will search for a free chunk of vm
  89  * space during mmap's.
  90  */
  91 #define TASK_UNMAPPED_BASE      (TASK_SIZE / 8 * 3)
  92
  93 typedef struct {
  94         unsigned long seg;
  95 } mm_segment_t;
  96
  97 struct thread_struct {
  98         unsigned long   ksp;            /* Kernel stack pointer */
  99         struct pt_regs  *regs;          /* Pointer to saved register state */
 100         mm_segment_t    fs;             /* for get_fs() validation */
 101         void            *pgdir;         /* root of page-table tree */
 102         int             fpexc_mode;     /* floating-point exception mode */
 103         signed long     last_syscall;
 104 #if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
 105         unsigned long   dbcr0;          /* debug control register values */
 106         unsigned long   dbcr1;
 107 #endif
 108         double          fpr[32];        /* Complete floating point set */
 109         unsigned long   fpscr_pad;      /* fpr ... fpscr must be contiguous */
 110         unsigned long   fpscr;          /* Floating point status */
 111 #ifdef CONFIG_ALTIVEC
 112         /* Complete AltiVec register set */
 113         vector128       vr[32] __attribute((aligned(16)));
 114         /* AltiVec status */
 115         vector128       vscr __attribute((aligned(16)));
 116         unsigned long   vrsave;
 117         int             used_vr;        /* set if process has used altivec */
 118 #endif /* CONFIG_ALTIVEC */
 119 #ifdef CONFIG_SPE
 120         unsigned long   evr[32];        /* upper 32-bits of SPE regs */
 121         u64             acc;            /* Accumulator */
 122         unsigned long   spefscr;        /* SPE & eFP status */
 123         int             used_spe;       /* set if process has used spe */
 124 #endif /* CONFIG_SPE */
 125 };
 126
 127 #define ARCH_MIN_TASKALIGN 16
 128
 129 #define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
 130
 131 #define INIT_THREAD { \
 132         .ksp = INIT_SP, \
 133         .fs = KERNEL_DS, \
 134         .pgdir = swapper_pg_dir, \
 135         .fpexc_mode = MSR_FE0 | MSR_FE1, \
 136 }
 137
 138 /*
 139  * Return saved PC of a blocked thread. For now, this is the "user" PC
 140  */
 141 #define thread_saved_pc(tsk)    \
 142         ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 143
 144 unsigned long get_wchan(struct task_struct *p);
 145
 146 #define KSTK_EIP(tsk)   ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
 147 #define KSTK_ESP(tsk)   ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)
 148
 149 /* Get/set floating-point exception mode */
 150 #define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
 151 #define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))
 152
 153 extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
 154 extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 155
 156 static inline unsigned int __unpack_fe01(unsigned int msr_bits)
 157 {
 158         return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
 159 }
 160
 161 static inline unsigned int __pack_fe01(unsigned int fpmode)
 162 {
 163         return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
 164 }
 165
 166 /* in process.c - for early bootup debug -- Cort */
 167 int ll_printk(const char *, ...);
 168 void ll_puts(const char *);
 169
 170 /* In misc.c */
 171 void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
 172
 173 #define have_of (_machine == _MACH_chrp || _machine == _MACH_Pmac)
 174
 175 #define cpu_relax()     barrier()
 176
 177 /*
 178  * Prefetch macros.
 179  */
 180 #define ARCH_HAS_PREFETCH
 181 #define ARCH_HAS_PREFETCHW
 182 #define ARCH_HAS_SPINLOCK_PREFETCH
 183
 184 extern inline void prefetch(const void *x)
 185 {
 186          __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
 187 }
 188
 189 extern inline void prefetchw(const void *x)
 190 {
 191          __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
 192 }
 193
 194 #define spin_lock_prefetch(x)   prefetchw(x)
 195
 196 extern int emulate_altivec(struct pt_regs *regs);
 197
 198 #endif /* !__ASSEMBLY__ */
 199
 200 #endif /* __ASM_PPC_PROCESSOR_H */
 201 #endif /* __KERNEL__ */