- 根目录:
- arch
- sparc
- include
- asm
- system_32.h
#ifndef __SPARC_SYSTEM_H
#define __SPARC_SYSTEM_H
#include <linux/kernel.h>
#include <linux/threads.h> /* NR_CPUS */
#include <linux/thread_info.h>
#include <asm/page.h>
#include <asm/psr.h>
#include <asm/ptrace.h>
#include <asm/btfixup.h>
#include <asm/smp.h>
#ifndef __ASSEMBLY__
#include <linux/irqflags.h>
/*
* Sparc (general) CPU types
*/
enum sparc_cpu {
sun4 = 0x00,
sun4c = 0x01,
sun4m = 0x02,
sun4d = 0x03,
sun4e = 0x04,
sun4u = 0x05, /* V8 ploos ploos */
sun_unknown = 0x06,
ap1000 = 0x07, /* almost a sun4m */
sparc_leon = 0x08, /* Leon SoC */
};
/* Really, userland should not be looking at any of this... */
#ifdef __KERNEL__
extern enum sparc_cpu sparc_cpu_model;
#define ARCH_SUN4C (sparc_cpu_model==sun4c)
#define SUN4M_NCPUS 4 /* Architectural limit of sun4m. */
extern char reboot_command[];
extern struct thread_info *current_set[NR_CPUS];
extern unsigned long empty_bad_page;
extern unsigned long empty_bad_page_table;
extern unsigned long empty_zero_page;
extern void sun_do_break(void);
extern int serial_console;
extern int stop_a_enabled;
extern int scons_pwroff;
static inline int con_is_present(void)
{
return serial_console ? 0 : 1;
}
/* When a context switch happens we must flush all user windows so that
* the windows of the current process are flushed onto its stack. This
* way the windows are all clean for the next process and the stack
* frames are up to date.
*/
extern void flush_user_windows(void);
extern void kill_user_windows(void);
extern void synchronize_user_stack(void);
extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
void *fpqueue, unsigned long *fpqdepth);
#ifdef CONFIG_SMP
#define SWITCH_ENTER(prv) \
do { \
if (test_tsk_thread_flag(prv, TIF_USEDFPU)) { \
put_psr(get_psr() | PSR_EF); \
fpsave(&(prv)->thread.float_regs[0], &(prv)->thread.fsr, \
&(prv)->thread.fpqueue[0], &(prv)->thread.fpqdepth); \
clear_tsk_thread_flag(prv, TIF_USEDFPU); \
(prv)->thread.kregs->psr &= ~PSR_EF; \
} \
} while(0)
#define SWITCH_DO_LAZY_FPU(next) /* */
#else
#define SWITCH_ENTER(prv) /* */
#define SWITCH_DO_LAZY_FPU(nxt) \
do { \
if (last_task_used_math != (nxt)) \
(nxt)->thread.kregs->psr&=~PSR_EF; \
} while(0)
#endif
extern void flushw_all(void);
/*
* Flush windows so that the VM switch which follows
* would not pull the stack from under us.
*
* SWITCH_ENTER and SWITH_DO_LAZY_FPU do not work yet (e.g. SMP does not work)
* XXX WTF is the above comment? Found in late teen 2.4.x.
*/
#define prepare_arch_switch(next) do { \
__asm__ __volatile__( \
".globl\tflush_patch_switch\nflush_patch_switch:\n\t" \
"save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
"save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
"save %sp, -0x40, %sp\n\t" \
"restore; restore; restore; restore; restore; restore; restore"); \
} while(0)
/* Much care has gone into this code, do not touch it.
*
* We need to loadup regs l0/l1 for the newly forked child
* case because the trap return path relies on those registers
* holding certain values, gcc is told that they are clobbered.
* Gcc needs registers for 3 values in and 1 value out, so we
* clobber every non-fixed-usage register besides l2/l3/o4/o5. -DaveM
*
* Hey Dave, that do not touch sign is too much of an incentive
* - Anton & Pete
*/
#define switch_to(prev, next, last) do { \
SWITCH_ENTER(prev); \
SWITCH_DO_LAZY_FPU(next); \
cpumask_set_cpu(smp_processor_id(), mm_cpumask(next->active_mm)); \
__asm__ __volatile__( \
"sethi %%hi(here - 0x8), %%o7\n\t" \
"mov %%g6, %%g3\n\t" \
"or %%o7, %%lo(here - 0x8), %%o7\n\t" \
"rd %%psr, %%g4\n\t" \
"std %%sp, [%%g6 + %4]\n\t" \
"rd %%wim, %%g5\n\t" \
"wr %%g4, 0x20, %%psr\n\t" \
"nop\n\t" \
"std %%g4, [%%g6 + %3]\n\t" \
"ldd [%2 + %3], %%g4\n\t" \
"mov %2, %%g6\n\t" \
".globl patchme_store_new_current\n" \
"patchme_store_new_current:\n\t" \
"st %2, [%1]\n\t" \
"wr %%g4, 0x20, %%psr\n\t" \
"nop\n\t" \
"nop\n\t" \
"nop\n\t" /* LEON needs all 3 nops: load to %sp depends on CWP. */ \
"ldd [%%g6 + %4], %%sp\n\t" \
"wr %%g5, 0x0, %%wim\n\t" \
"ldd [%%sp + 0x00], %%l0\n\t" \
"ldd [%%sp + 0x38], %%i6\n\t" \
"wr %%g4, 0x0, %%psr\n\t" \
"nop\n\t" \
"nop\n\t" \
"jmpl %%o7 + 0x8, %%g0\n\t" \
" ld [%%g3 + %5], %0\n\t" \
"here:\n" \
: "=&r" (last) \
: "r" (&(current_set[hard_smp_processor_id()])), \
"r" (task_thread_info(next)), \
"i" (TI_KPSR), \
"i" (TI_KSP), \
"i" (TI_TASK) \
: "g1", "g2", "g3", "g4", "g5", "g7", \
"l0", "l1", "l3", "l4", "l5", "l6", "l7", \
"i0", "i1", "i2", "i3", "i4", "i5", \
"o0", "o1", "o2", "o3", "o7"); \
} while(0)
/* XXX Change this if we ever use a PSO mode kernel. */
#define mb() __asm__ __volatile__ ("" : : : "memory")
#define rmb() mb()
#define wmb() mb()
#define read_barrier_depends() do { } while(0)
#define set_mb(__var, __value) do { __var = __value; mb(); } while(0)
#define smp_mb() __asm__ __volatile__("":::"memory")
#define smp_rmb() __asm__ __volatile__("":::"memory")
#define smp_wmb() __asm__ __volatile__("":::"memory")
#define smp_read_barrier_depends() do { } while(0)
#define nop() __asm__ __volatile__ ("nop")
/* This has special calling conventions */
#ifndef CONFIG_SMP
BTFIXUPDEF_CALL(void, ___xchg32, void)
#endif
static inline unsigned long xchg_u32(__volatile__ unsigned long *m, unsigned long val)
{
#ifdef CONFIG_SMP
__asm__ __volatile__("swap [%2], %0"
: "=&r" (val)
: "0" (val), "r" (m)
: "memory");
return val;
#else
register unsigned long *ptr asm("g1");
register unsigned long ret asm("g2");
ptr = (unsigned long *) m;
ret = val;
/* Note: this is magic and the nop there is
really needed. */
__asm__ __volatile__(
"mov %%o7, %%g4\n\t"
"call ___f____xchg32\n\t"
" nop\n\t"
: "=&r" (ret)
: "0" (ret), "r" (ptr)
: "g3", "g4", "g7", "memory", "cc");
return ret;
#endif
}
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
extern void __xchg_called_with_bad_pointer(void);
static inline unsigned long __xchg(unsigned long x, __volatile__ void * ptr, int size)
{
switch (size) {
case 4:
return xchg_u32(ptr, x);
}
__xchg_called_with_bad_pointer();
return x;
}
/* Emulate cmpxchg() the same way we emulate atomics,
* by hashing the object address and indexing into an array
* of spinlocks to get a bit of performance...
*
* See arch/sparc/lib/atomic32.c for implementation.
*
* Cribbed from <asm-parisc/atomic.h>
*/
#define __HAVE_ARCH_CMPXCHG 1
/* bug catcher for when unsupported size is used - won't link */
extern void __cmpxchg_called_with_bad_pointer(void);
/* we only need to support cmpxchg of a u32 on sparc */
extern unsigned long __cmpxchg_u32(volatile u32 *m, u32 old, u32 new_);
/* don't worry...optimizer will get rid of most of this */
static inline unsigned long
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
{
switch (size) {
case 4:
return __cmpxchg_u32((u32 *)ptr, (u32)old, (u32)new_);
default:
__cmpxchg_called_with_bad_pointer();
break;
}
return old;
}
#define cmpxchg(ptr, o, n) \
({ \
__typeof__(*(ptr)) _o_ = (o); \
__typeof__(*(ptr)) _n_ = (n); \
(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
(unsigned long)_n_, sizeof(*(ptr))); \
})
#include <asm-generic/cmpxchg-local.h>
/*
* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
* them available.
*/
#define cmpxchg_local(ptr, o, n) \
((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
(unsigned long)(n), sizeof(*(ptr))))
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn));
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
#define arch_align_stack(x) (x)
#endif /* !(__SPARC_SYSTEM_H) */