2005-04-17 06:20:36 +08:00
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/*
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* Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
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*/
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#ifndef __PPC_SYSTEM_H
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#define __PPC_SYSTEM_H
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#include <linux/kernel.h>
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#include <asm/hw_irq.h>
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/*
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* Memory barrier.
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* The sync instruction guarantees that all memory accesses initiated
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* by this processor have been performed (with respect to all other
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* mechanisms that access memory). The eieio instruction is a barrier
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* providing an ordering (separately) for (a) cacheable stores and (b)
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* loads and stores to non-cacheable memory (e.g. I/O devices).
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*
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* mb() prevents loads and stores being reordered across this point.
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* rmb() prevents loads being reordered across this point.
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* wmb() prevents stores being reordered across this point.
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* read_barrier_depends() prevents data-dependent loads being reordered
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* across this point (nop on PPC).
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*
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* We can use the eieio instruction for wmb, but since it doesn't
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* give any ordering guarantees about loads, we have to use the
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* stronger but slower sync instruction for mb and rmb.
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*/
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#define mb() __asm__ __volatile__ ("sync" : : : "memory")
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#define rmb() __asm__ __volatile__ ("sync" : : : "memory")
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#define wmb() __asm__ __volatile__ ("eieio" : : : "memory")
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#define read_barrier_depends() do { } while(0)
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#define set_mb(var, value) do { var = value; mb(); } while (0)
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#ifdef CONFIG_SMP
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#define smp_mb() mb()
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#define smp_rmb() rmb()
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2006-01-12 18:22:34 +08:00
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#define smp_wmb() __asm__ __volatile__ ("eieio" : : : "memory")
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2005-04-17 06:20:36 +08:00
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#define smp_read_barrier_depends() read_barrier_depends()
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#else
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#define smp_mb() barrier()
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#define smp_rmb() barrier()
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#define smp_wmb() barrier()
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#define smp_read_barrier_depends() do { } while(0)
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#endif /* CONFIG_SMP */
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#ifdef __KERNEL__
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struct task_struct;
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struct pt_regs;
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extern void print_backtrace(unsigned long *);
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extern void show_regs(struct pt_regs * regs);
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extern void flush_instruction_cache(void);
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extern void hard_reset_now(void);
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extern void poweroff_now(void);
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#ifdef CONFIG_6xx
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extern long _get_L2CR(void);
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extern long _get_L3CR(void);
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extern void _set_L2CR(unsigned long);
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extern void _set_L3CR(unsigned long);
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#else
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#define _get_L2CR() 0L
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#define _get_L3CR() 0L
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#define _set_L2CR(val) do { } while(0)
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#define _set_L3CR(val) do { } while(0)
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#endif
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extern void via_cuda_init(void);
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extern void pmac_nvram_init(void);
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2005-10-29 08:46:19 +08:00
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extern void chrp_nvram_init(void);
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2005-04-17 06:20:36 +08:00
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extern void read_rtc_time(void);
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extern void pmac_find_display(void);
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extern void giveup_fpu(struct task_struct *);
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2006-01-12 18:22:34 +08:00
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extern void disable_kernel_fp(void);
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2005-04-17 06:20:36 +08:00
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extern void enable_kernel_fp(void);
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2005-10-17 18:12:39 +08:00
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extern void flush_fp_to_thread(struct task_struct *);
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2005-04-17 06:20:36 +08:00
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extern void enable_kernel_altivec(void);
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extern void giveup_altivec(struct task_struct *);
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extern void load_up_altivec(struct task_struct *);
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2005-10-11 20:08:12 +08:00
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extern int emulate_altivec(struct pt_regs *);
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2005-04-17 06:20:36 +08:00
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extern void giveup_spe(struct task_struct *);
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extern void load_up_spe(struct task_struct *);
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extern int fix_alignment(struct pt_regs *);
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[PATCH] powerpc: Fix handling of fpscr on 64-bit
The recent merge of fpu.S broken the handling of fpscr for
ARCH=powerpc and CONFIG_PPC64=y. FP registers could be corrupted,
leading to strange random application crashes.
The confusion arises, because the thread_struct has (and requires) a
64-bit area to save the fpscr, because we use load/store double
instructions to get it in to/out of the FPU. However, only the low
32-bits are actually used, so we want to treat it as a 32-bit quantity
when manipulating its bits to avoid extra load/stores on 32-bit. This
patch replaces the current definition with a structure of two 32-bit
quantities (pad and val), to clarify things as much as is possible.
The 'val' field is used when manipulating bits, the structure itself
is used when obtaining the address for loading/unloading the value
from the FPU.
While we're at it, consolidate the 4 (!) almost identical versions of
cvt_fd() and cvt_df() (arch/ppc/kernel/misc.S,
arch/ppc64/kernel/misc.S, arch/powerpc/kernel/misc_32.S,
arch/powerpc/kernel/misc_64.S) into a single version in fpu.S. The
new version takes a pointer to thread_struct and applies the correct
offset itself, rather than a pointer to the fpscr field itself, again
to avoid confusion as to which is the correct field to use.
Finally, this patch makes ARCH=ppc64 also use the consolidated fpu.S
code, which it previously did not.
Built for G5 (ARCH=ppc64 and ARCH=powerpc), 32-bit powermac (ARCH=ppc
and ARCH=powerpc) and Walnut (ARCH=ppc, CONFIG_MATH_EMULATION=y).
Booted on G5 (ARCH=powerpc) and things which previously fell over no
longer do.
Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-10-27 14:27:25 +08:00
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extern void cvt_fd(float *from, double *to, struct thread_struct *thread);
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extern void cvt_df(double *from, float *to, struct thread_struct *thread);
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2005-10-17 18:12:39 +08:00
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2006-01-12 18:22:34 +08:00
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#ifndef CONFIG_SMP
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extern void discard_lazy_cpu_state(void);
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#else
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static inline void discard_lazy_cpu_state(void)
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{
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}
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#endif
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2005-10-17 18:12:39 +08:00
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#ifdef CONFIG_ALTIVEC
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extern void flush_altivec_to_thread(struct task_struct *);
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#else
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static inline void flush_altivec_to_thread(struct task_struct *t)
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{
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}
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#endif
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#ifdef CONFIG_SPE
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extern void flush_spe_to_thread(struct task_struct *);
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#else
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static inline void flush_spe_to_thread(struct task_struct *t)
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{
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}
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#endif
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2005-04-17 06:20:36 +08:00
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extern int call_rtas(const char *, int, int, unsigned long *, ...);
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extern void cacheable_memzero(void *p, unsigned int nb);
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2005-09-04 06:55:54 +08:00
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extern void *cacheable_memcpy(void *, const void *, unsigned int);
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2005-04-17 06:20:36 +08:00
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extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
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extern void bad_page_fault(struct pt_regs *, unsigned long, int);
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2005-10-01 16:43:42 +08:00
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extern int die(const char *, struct pt_regs *, long);
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2005-09-10 19:13:11 +08:00
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extern void _exception(int, struct pt_regs *, int, unsigned long);
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2005-10-11 20:08:12 +08:00
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void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val);
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2005-09-04 06:55:39 +08:00
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#ifdef CONFIG_BOOKE_WDT
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extern u32 booke_wdt_enabled;
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extern u32 booke_wdt_period;
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#endif /* CONFIG_BOOKE_WDT */
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2005-04-17 06:20:36 +08:00
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struct device_node;
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extern void note_scsi_host(struct device_node *, void *);
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extern struct task_struct *__switch_to(struct task_struct *,
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struct task_struct *);
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#define switch_to(prev, next, last) ((last) = __switch_to((prev), (next)))
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struct thread_struct;
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extern struct task_struct *_switch(struct thread_struct *prev,
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struct thread_struct *next);
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extern unsigned int rtas_data;
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static __inline__ unsigned long
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xchg_u32(volatile void *p, unsigned long val)
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{
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unsigned long prev;
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__asm__ __volatile__ ("\n\
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1: lwarx %0,0,%2 \n"
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PPC405_ERR77(0,%2)
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" stwcx. %3,0,%2 \n\
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bne- 1b"
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: "=&r" (prev), "=m" (*(volatile unsigned long *)p)
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: "r" (p), "r" (val), "m" (*(volatile unsigned long *)p)
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: "cc", "memory");
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return prev;
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}
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/*
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* This function doesn't exist, so you'll get a linker error
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* if something tries to do an invalid xchg().
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*/
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extern void __xchg_called_with_bad_pointer(void);
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#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
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static inline unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
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{
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switch (size) {
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case 4:
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return (unsigned long) xchg_u32(ptr, x);
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#if 0 /* xchg_u64 doesn't exist on 32-bit PPC */
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case 8:
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return (unsigned long) xchg_u64(ptr, x);
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#endif /* 0 */
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}
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__xchg_called_with_bad_pointer();
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return x;
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}
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extern inline void * xchg_ptr(void * m, void * val)
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{
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return (void *) xchg_u32(m, (unsigned long) val);
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}
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#define __HAVE_ARCH_CMPXCHG 1
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static __inline__ unsigned long
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__cmpxchg_u32(volatile unsigned int *p, unsigned int old, unsigned int new)
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{
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unsigned int prev;
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__asm__ __volatile__ ("\n\
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1: lwarx %0,0,%2 \n\
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cmpw 0,%0,%3 \n\
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bne 2f \n"
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PPC405_ERR77(0,%2)
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" stwcx. %4,0,%2 \n\
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bne- 1b\n"
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#ifdef CONFIG_SMP
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" sync\n"
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#endif /* CONFIG_SMP */
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"2:"
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: "=&r" (prev), "=m" (*p)
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: "r" (p), "r" (old), "r" (new), "m" (*p)
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: "cc", "memory");
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return prev;
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}
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/* This function doesn't exist, so you'll get a linker error
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if something tries to do an invalid cmpxchg(). */
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extern void __cmpxchg_called_with_bad_pointer(void);
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static __inline__ unsigned long
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__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
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{
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switch (size) {
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case 4:
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return __cmpxchg_u32(ptr, old, new);
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#if 0 /* we don't have __cmpxchg_u64 on 32-bit PPC */
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case 8:
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return __cmpxchg_u64(ptr, old, new);
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#endif /* 0 */
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}
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__cmpxchg_called_with_bad_pointer();
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return old;
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}
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#define cmpxchg(ptr,o,n) \
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({ \
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__typeof__(*(ptr)) _o_ = (o); \
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__typeof__(*(ptr)) _n_ = (n); \
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(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
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(unsigned long)_n_, sizeof(*(ptr))); \
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})
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#define arch_align_stack(x) (x)
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#endif /* __KERNEL__ */
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#endif /* __PPC_SYSTEM_H */
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