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processor.h

#ifndef _ASM_POWERPC_PROCESSOR_H
#define _ASM_POWERPC_PROCESSOR_H

/*
 * Copyright (C) 2001 PPC 64 Team, IBM Corp
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <asm/reg.h>

#ifdef CONFIG_VSX
#define TS_FPRWIDTH 2
#else
#define TS_FPRWIDTH 1
#endif

#ifndef __ASSEMBLY__
#include <linux/compiler.h>
#include <asm/ptrace.h>
#include <asm/types.h>

/* We do _not_ want to define new machine types at all, those must die
 * in favor of using the device-tree
 * -- BenH.
 */

/* PREP sub-platform types see residual.h for these */
#define _PREP_Motorola  0x01  /* motorola prep */
#define _PREP_Firm      0x02  /* firmworks prep */
#define _PREP_IBM 0x00  /* ibm prep */
#define _PREP_Bull      0x03  /* bull prep */

/* CHRP sub-platform types. These are arbitrary */
#define _CHRP_Motorola  0x04  /* motorola chrp, the cobra */
#define _CHRP_IBM 0x05  /* IBM chrp, the longtrail and longtrail 2 */
#define _CHRP_Pegasos   0x06  /* Genesi/bplan's Pegasos and Pegasos2 */
#define _CHRP_briq      0x07  /* TotalImpact's briQ */

#if defined(__KERNEL__) && defined(CONFIG_PPC32)

extern int _chrp_type;

#ifdef CONFIG_PPC_PREP

/* what kind of prep workstation we are */
extern int _prep_type;

#endif /* CONFIG_PPC_PREP */

#endif /* defined(__KERNEL__) && defined(CONFIG_PPC32) */

/*
 * Default implementation of macro that returns current
 * instruction pointer ("program counter").
 */
#define current_text_addr() ({ __label__ _l; _l: &&_l;})

/* Macros for adjusting thread priority (hardware multi-threading) */
#define HMT_very_low()   asm volatile("or 31,31,31   # very low priority")
#define HMT_low()  asm volatile("or 1,1,1      # low priority")
#define HMT_medium_low() asm volatile("or 6,6,6      # medium low priority")
#define HMT_medium()     asm volatile("or 2,2,2      # medium priority")
#define HMT_medium_high() asm volatile("or 5,5,5      # medium high priority")
#define HMT_high()       asm volatile("or 3,3,3      # high priority")

#ifdef __KERNEL__

extern int have_of;

struct task_struct;
void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp);
void release_thread(struct task_struct *);

/* Prepare to copy thread state - unlazy all lazy status */
extern void prepare_to_copy(struct task_struct *tsk);

/* Create a new kernel thread. */
extern long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);

/* Lazy FPU handling on uni-processor */
extern struct task_struct *last_task_used_math;
extern struct task_struct *last_task_used_altivec;
extern struct task_struct *last_task_used_vsx;
extern struct task_struct *last_task_used_spe;

#ifdef CONFIG_PPC32

#if CONFIG_TASK_SIZE > CONFIG_KERNEL_START
#error User TASK_SIZE overlaps with KERNEL_START address
#endif
#define TASK_SIZE (CONFIG_TASK_SIZE)

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE    (TASK_SIZE / 8 * 3)
#endif

#ifdef CONFIG_PPC64
/* 64-bit user address space is 44-bits (16TB user VM) */
#define TASK_SIZE_USER64 (0x0000100000000000UL)

/* 
 * 32-bit user address space is 4GB - 1 page 
 * (this 1 page is needed so referencing of 0xFFFFFFFF generates EFAULT
 */
#define TASK_SIZE_USER32 (0x0000000100000000UL - (1*PAGE_SIZE))

#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
            TASK_SIZE_USER32 : TASK_SIZE_USER64)
#define TASK_SIZE   TASK_SIZE_OF(current)

/* This decides where the kernel will search for a free chunk of vm
 * space during mmap's.
 */
#define TASK_UNMAPPED_BASE_USER32 (PAGE_ALIGN(TASK_SIZE_USER32 / 4))
#define TASK_UNMAPPED_BASE_USER64 (PAGE_ALIGN(TASK_SIZE_USER64 / 4))

#define TASK_UNMAPPED_BASE ((test_thread_flag(TIF_32BIT)) ? \
            TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
#endif

#ifdef __KERNEL__
#ifdef __powerpc64__

#define STACK_TOP_USER64 TASK_SIZE_USER64
#define STACK_TOP_USER32 TASK_SIZE_USER32

#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
               STACK_TOP_USER32 : STACK_TOP_USER64)

#define STACK_TOP_MAX STACK_TOP_USER64

#else /* __powerpc64__ */

#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX   STACK_TOP

#endif /* __powerpc64__ */
#endif /* __KERNEL__ */

typedef struct {
      unsigned long seg;
} mm_segment_t;

#define TS_FPROFFSET 0
#define TS_VSRLOWOFFSET 1
#define TS_FPR(i) fpr[i][TS_FPROFFSET]

struct thread_struct {
      unsigned long     ksp;        /* Kernel stack pointer */
      unsigned long     ksp_limit;  /* if ksp <= ksp_limit stack overflow */

#ifdef CONFIG_PPC64
      unsigned long     ksp_vsid;
#endif
      struct pt_regs    *regs;            /* Pointer to saved register state */
      mm_segment_t      fs;         /* for get_fs() validation */
#ifdef CONFIG_PPC32
      void        *pgdir;           /* root of page-table tree */
#endif
#if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
      unsigned long     dbcr0;            /* debug control register values */
      unsigned long     dbcr1;
#endif
      /* FP and VSX 0-31 register set */
      double            fpr[32][TS_FPRWIDTH];
      struct {

            unsigned int pad;
            unsigned int val; /* Floating point status */
      } fpscr;
      int         fpexc_mode; /* floating-point exception mode */
      unsigned int      align_ctl;  /* alignment handling control */
#ifdef CONFIG_PPC64
      unsigned long     start_tb;   /* Start purr when proc switched in */
      unsigned long     accum_tb;   /* Total accumilated purr for process */
#endif
      unsigned long     dabr;       /* Data address breakpoint register */
#ifdef CONFIG_ALTIVEC
      /* Complete AltiVec register set */
      vector128   vr[32] __attribute__((aligned(16)));
      /* AltiVec status */
      vector128   vscr __attribute__((aligned(16)));
      unsigned long     vrsave;
      int         used_vr;    /* set if process has used altivec */
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_VSX
      /* VSR status */
      int         used_vsr;   /* set if process has used altivec */
#endif /* CONFIG_VSX */
#ifdef CONFIG_SPE
      unsigned long     evr[32];    /* upper 32-bits of SPE regs */
      u64         acc;        /* Accumulator */
      unsigned long     spefscr;    /* SPE & eFP status */
      int         used_spe;   /* set if process has used spe */
#endif /* CONFIG_SPE */
};

#define ARCH_MIN_TASKALIGN 16

#define INIT_SP         (sizeof(init_stack) + (unsigned long) &init_stack)
#define INIT_SP_LIMIT \
      (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)


#ifdef CONFIG_PPC32
#define INIT_THREAD { \
      .ksp = INIT_SP, \
      .ksp_limit = INIT_SP_LIMIT, \
      .fs = KERNEL_DS, \
      .pgdir = swapper_pg_dir, \
      .fpexc_mode = MSR_FE0 | MSR_FE1, \
}
#else
#define INIT_THREAD  { \
      .ksp = INIT_SP, \
      .ksp_limit = INIT_SP_LIMIT, \
      .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
      .fs = KERNEL_DS, \
      .fpr = {{0}}, \
      .fpscr = { .val = 0, }, \
      .fpexc_mode = 0, \
}
#endif

/*
 * Return saved PC of a blocked thread. For now, this is the "user" PC
 */
#define thread_saved_pc(tsk)    \
        ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)

#define task_pt_regs(tsk)     ((struct pt_regs *)(tsk)->thread.regs)

unsigned long get_wchan(struct task_struct *p);

#define KSTK_EIP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->nip: 0)
#define KSTK_ESP(tsk)  ((tsk)->thread.regs? (tsk)->thread.regs->gpr[1]: 0)

/* Get/set floating-point exception mode */
#define GET_FPEXC_CTL(tsk, adr) get_fpexc_mode((tsk), (adr))
#define SET_FPEXC_CTL(tsk, val) set_fpexc_mode((tsk), (val))

extern int get_fpexc_mode(struct task_struct *tsk, unsigned long adr);
extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);

#define GET_ENDIAN(tsk, adr) get_endian((tsk), (adr))
#define SET_ENDIAN(tsk, val) set_endian((tsk), (val))

extern int get_endian(struct task_struct *tsk, unsigned long adr);
extern int set_endian(struct task_struct *tsk, unsigned int val);

#define GET_UNALIGN_CTL(tsk, adr)   get_unalign_ctl((tsk), (adr))
#define SET_UNALIGN_CTL(tsk, val)   set_unalign_ctl((tsk), (val))

extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);

static inline unsigned int __unpack_fe01(unsigned long msr_bits)
{
      return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);
}

static inline unsigned long __pack_fe01(unsigned int fpmode)
{
      return ((fpmode << 10) & MSR_FE0) | ((fpmode << 8) & MSR_FE1);
}

#ifdef CONFIG_PPC64
#define cpu_relax()     do { HMT_low(); HMT_medium(); barrier(); } while (0)
#else
#define cpu_relax()     barrier()
#endif

/* Check that a certain kernel stack pointer is valid in task_struct p */
int validate_sp(unsigned long sp, struct task_struct *p,
                       unsigned long nbytes);

/*
 * Prefetch macros.
 */
#define ARCH_HAS_PREFETCH
#define ARCH_HAS_PREFETCHW
#define ARCH_HAS_SPINLOCK_PREFETCH

static inline void prefetch(const void *x)
{
      if (unlikely(!x))
            return;

      __asm__ __volatile__ ("dcbt 0,%0" : : "r" (x));
}

static inline void prefetchw(const void *x)
{
      if (unlikely(!x))
            return;

      __asm__ __volatile__ ("dcbtst 0,%0" : : "r" (x));
}

#define spin_lock_prefetch(x) prefetchw(x)

#ifdef CONFIG_PPC64
#define HAVE_ARCH_PICK_MMAP_LAYOUT
#endif

#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_PROCESSOR_H */

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