mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 12:30:55 +07:00
384 lines
11 KiB
C
384 lines
11 KiB
C
/* $Id: system.h,v 1.69 2002/02/09 19:49:31 davem Exp $ */
|
|
#ifndef __SPARC64_SYSTEM_H
|
|
#define __SPARC64_SYSTEM_H
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/visasm.h>
|
|
|
|
#ifndef __ASSEMBLY__
|
|
/*
|
|
* 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 */
|
|
};
|
|
|
|
#define sparc_cpu_model sun4u
|
|
|
|
/* This cannot ever be a sun4c nor sun4 :) That's just history. */
|
|
#define ARCH_SUN4C_SUN4 0
|
|
#define ARCH_SUN4 0
|
|
|
|
/* These are here in an effort to more fully work around Spitfire Errata
|
|
* #51. Essentially, if a memory barrier occurs soon after a mispredicted
|
|
* branch, the chip can stop executing instructions until a trap occurs.
|
|
* Therefore, if interrupts are disabled, the chip can hang forever.
|
|
*
|
|
* It used to be believed that the memory barrier had to be right in the
|
|
* delay slot, but a case has been traced recently wherein the memory barrier
|
|
* was one instruction after the branch delay slot and the chip still hung.
|
|
* The offending sequence was the following in sym_wakeup_done() of the
|
|
* sym53c8xx_2 driver:
|
|
*
|
|
* call sym_ccb_from_dsa, 0
|
|
* movge %icc, 0, %l0
|
|
* brz,pn %o0, .LL1303
|
|
* mov %o0, %l2
|
|
* membar #LoadLoad
|
|
*
|
|
* The branch has to be mispredicted for the bug to occur. Therefore, we put
|
|
* the memory barrier explicitly into a "branch always, predicted taken"
|
|
* delay slot to avoid the problem case.
|
|
*/
|
|
#define membar_safe(type) \
|
|
do { __asm__ __volatile__("ba,pt %%xcc, 1f\n\t" \
|
|
" membar " type "\n" \
|
|
"1:\n" \
|
|
: : : "memory"); \
|
|
} while (0)
|
|
|
|
#define mb() \
|
|
membar_safe("#LoadLoad | #LoadStore | #StoreStore | #StoreLoad")
|
|
#define rmb() \
|
|
membar_safe("#LoadLoad")
|
|
#define wmb() \
|
|
membar_safe("#StoreStore")
|
|
#define membar_storeload() \
|
|
membar_safe("#StoreLoad")
|
|
#define membar_storeload_storestore() \
|
|
membar_safe("#StoreLoad | #StoreStore")
|
|
#define membar_storeload_loadload() \
|
|
membar_safe("#StoreLoad | #LoadLoad")
|
|
#define membar_storestore_loadstore() \
|
|
membar_safe("#StoreStore | #LoadStore")
|
|
|
|
#endif
|
|
|
|
#define setipl(__new_ipl) \
|
|
__asm__ __volatile__("wrpr %0, %%pil" : : "r" (__new_ipl) : "memory")
|
|
|
|
#define local_irq_disable() \
|
|
__asm__ __volatile__("wrpr 15, %%pil" : : : "memory")
|
|
|
|
#define local_irq_enable() \
|
|
__asm__ __volatile__("wrpr 0, %%pil" : : : "memory")
|
|
|
|
#define getipl() \
|
|
({ unsigned long retval; __asm__ __volatile__("rdpr %%pil, %0" : "=r" (retval)); retval; })
|
|
|
|
#define swap_pil(__new_pil) \
|
|
({ unsigned long retval; \
|
|
__asm__ __volatile__("rdpr %%pil, %0\n\t" \
|
|
"wrpr %1, %%pil" \
|
|
: "=&r" (retval) \
|
|
: "r" (__new_pil) \
|
|
: "memory"); \
|
|
retval; \
|
|
})
|
|
|
|
#define read_pil_and_cli() \
|
|
({ unsigned long retval; \
|
|
__asm__ __volatile__("rdpr %%pil, %0\n\t" \
|
|
"wrpr 15, %%pil" \
|
|
: "=r" (retval) \
|
|
: : "memory"); \
|
|
retval; \
|
|
})
|
|
|
|
#define local_save_flags(flags) ((flags) = getipl())
|
|
#define local_irq_save(flags) ((flags) = read_pil_and_cli())
|
|
#define local_irq_restore(flags) setipl((flags))
|
|
|
|
/* On sparc64 IRQ flags are the PIL register. A value of zero
|
|
* means all interrupt levels are enabled, any other value means
|
|
* only IRQ levels greater than that value will be received.
|
|
* Consequently this means that the lowest IRQ level is one.
|
|
*/
|
|
#define irqs_disabled() \
|
|
({ unsigned long flags; \
|
|
local_save_flags(flags);\
|
|
(flags > 0); \
|
|
})
|
|
|
|
#define nop() __asm__ __volatile__ ("nop")
|
|
|
|
#define read_barrier_depends() do { } while(0)
|
|
#define set_mb(__var, __value) \
|
|
do { __var = __value; membar_storeload_storestore(); } while(0)
|
|
#define set_wmb(__var, __value) \
|
|
do { __var = __value; wmb(); } while(0)
|
|
|
|
#ifdef CONFIG_SMP
|
|
#define smp_mb() mb()
|
|
#define smp_rmb() rmb()
|
|
#define smp_wmb() wmb()
|
|
#define smp_read_barrier_depends() read_barrier_depends()
|
|
#else
|
|
#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)
|
|
#endif
|
|
|
|
#define flushi(addr) __asm__ __volatile__ ("flush %0" : : "r" (addr) : "memory")
|
|
|
|
#define flushw_all() __asm__ __volatile__("flushw")
|
|
|
|
/* Performance counter register access. */
|
|
#define read_pcr(__p) __asm__ __volatile__("rd %%pcr, %0" : "=r" (__p))
|
|
#define write_pcr(__p) __asm__ __volatile__("wr %0, 0x0, %%pcr" : : "r" (__p))
|
|
#define read_pic(__p) __asm__ __volatile__("rd %%pic, %0" : "=r" (__p))
|
|
|
|
/* Blackbird errata workaround. See commentary in
|
|
* arch/sparc64/kernel/smp.c:smp_percpu_timer_interrupt()
|
|
* for more information.
|
|
*/
|
|
#define reset_pic() \
|
|
__asm__ __volatile__("ba,pt %xcc, 99f\n\t" \
|
|
".align 64\n" \
|
|
"99:wr %g0, 0x0, %pic\n\t" \
|
|
"rd %pic, %g0")
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
extern void sun_do_break(void);
|
|
extern int serial_console;
|
|
extern int stop_a_enabled;
|
|
|
|
static __inline__ int con_is_present(void)
|
|
{
|
|
return serial_console ? 0 : 1;
|
|
}
|
|
|
|
extern void synchronize_user_stack(void);
|
|
|
|
extern void __flushw_user(void);
|
|
#define flushw_user() __flushw_user()
|
|
|
|
#define flush_user_windows flushw_user
|
|
#define flush_register_windows flushw_all
|
|
|
|
/* Don't hold the runqueue lock over context switch */
|
|
#define __ARCH_WANT_UNLOCKED_CTXSW
|
|
#define prepare_arch_switch(next) \
|
|
do { \
|
|
flushw_all(); \
|
|
} while (0)
|
|
|
|
/* See what happens when you design the chip correctly?
|
|
*
|
|
* We tell gcc we clobber all non-fixed-usage registers except
|
|
* for l0/l1. It will use one for 'next' and the other to hold
|
|
* the output value of 'last'. 'next' is not referenced again
|
|
* past the invocation of switch_to in the scheduler, so we need
|
|
* not preserve it's value. Hairy, but it lets us remove 2 loads
|
|
* and 2 stores in this critical code path. -DaveM
|
|
*/
|
|
#define EXTRA_CLOBBER ,"%l1"
|
|
#define switch_to(prev, next, last) \
|
|
do { if (test_thread_flag(TIF_PERFCTR)) { \
|
|
unsigned long __tmp; \
|
|
read_pcr(__tmp); \
|
|
current_thread_info()->pcr_reg = __tmp; \
|
|
read_pic(__tmp); \
|
|
current_thread_info()->kernel_cntd0 += (unsigned int)(__tmp);\
|
|
current_thread_info()->kernel_cntd1 += ((__tmp) >> 32); \
|
|
} \
|
|
flush_tlb_pending(); \
|
|
save_and_clear_fpu(); \
|
|
/* If you are tempted to conditionalize the following */ \
|
|
/* so that ASI is only written if it changes, think again. */ \
|
|
__asm__ __volatile__("wr %%g0, %0, %%asi" \
|
|
: : "r" (__thread_flag_byte_ptr(task_thread_info(next))[TI_FLAG_BYTE_CURRENT_DS]));\
|
|
trap_block[current_thread_info()->cpu].thread = \
|
|
task_thread_info(next); \
|
|
__asm__ __volatile__( \
|
|
"mov %%g4, %%g7\n\t" \
|
|
"stx %%i6, [%%sp + 2047 + 0x70]\n\t" \
|
|
"stx %%i7, [%%sp + 2047 + 0x78]\n\t" \
|
|
"rdpr %%wstate, %%o5\n\t" \
|
|
"stx %%o6, [%%g6 + %3]\n\t" \
|
|
"stb %%o5, [%%g6 + %2]\n\t" \
|
|
"rdpr %%cwp, %%o5\n\t" \
|
|
"stb %%o5, [%%g6 + %5]\n\t" \
|
|
"mov %1, %%g6\n\t" \
|
|
"ldub [%1 + %5], %%g1\n\t" \
|
|
"wrpr %%g1, %%cwp\n\t" \
|
|
"ldx [%%g6 + %3], %%o6\n\t" \
|
|
"ldub [%%g6 + %2], %%o5\n\t" \
|
|
"ldub [%%g6 + %4], %%o7\n\t" \
|
|
"wrpr %%o5, 0x0, %%wstate\n\t" \
|
|
"ldx [%%sp + 2047 + 0x70], %%i6\n\t" \
|
|
"ldx [%%sp + 2047 + 0x78], %%i7\n\t" \
|
|
"ldx [%%g6 + %6], %%g4\n\t" \
|
|
"brz,pt %%o7, 1f\n\t" \
|
|
" mov %%g7, %0\n\t" \
|
|
"b,a ret_from_syscall\n\t" \
|
|
"1:\n\t" \
|
|
: "=&r" (last) \
|
|
: "0" (task_thread_info(next)), \
|
|
"i" (TI_WSTATE), "i" (TI_KSP), "i" (TI_NEW_CHILD), \
|
|
"i" (TI_CWP), "i" (TI_TASK) \
|
|
: "cc", \
|
|
"g1", "g2", "g3", "g7", \
|
|
"l2", "l3", "l4", "l5", "l6", "l7", \
|
|
"i0", "i1", "i2", "i3", "i4", "i5", \
|
|
"o0", "o1", "o2", "o3", "o4", "o5", "o7" EXTRA_CLOBBER);\
|
|
/* If you fuck with this, update ret_from_syscall code too. */ \
|
|
if (test_thread_flag(TIF_PERFCTR)) { \
|
|
write_pcr(current_thread_info()->pcr_reg); \
|
|
reset_pic(); \
|
|
} \
|
|
} while(0)
|
|
|
|
/*
|
|
* On SMP systems, when the scheduler does migration-cost autodetection,
|
|
* it needs a way to flush as much of the CPU's caches as possible.
|
|
*
|
|
* TODO: fill this in!
|
|
*/
|
|
static inline void sched_cacheflush(void)
|
|
{
|
|
}
|
|
|
|
static inline unsigned long xchg32(__volatile__ unsigned int *m, unsigned int val)
|
|
{
|
|
unsigned long tmp1, tmp2;
|
|
|
|
__asm__ __volatile__(
|
|
" membar #StoreLoad | #LoadLoad\n"
|
|
" mov %0, %1\n"
|
|
"1: lduw [%4], %2\n"
|
|
" cas [%4], %2, %0\n"
|
|
" cmp %2, %0\n"
|
|
" bne,a,pn %%icc, 1b\n"
|
|
" mov %1, %0\n"
|
|
" membar #StoreLoad | #StoreStore\n"
|
|
: "=&r" (val), "=&r" (tmp1), "=&r" (tmp2)
|
|
: "0" (val), "r" (m)
|
|
: "cc", "memory");
|
|
return val;
|
|
}
|
|
|
|
static inline unsigned long xchg64(__volatile__ unsigned long *m, unsigned long val)
|
|
{
|
|
unsigned long tmp1, tmp2;
|
|
|
|
__asm__ __volatile__(
|
|
" membar #StoreLoad | #LoadLoad\n"
|
|
" mov %0, %1\n"
|
|
"1: ldx [%4], %2\n"
|
|
" casx [%4], %2, %0\n"
|
|
" cmp %2, %0\n"
|
|
" bne,a,pn %%xcc, 1b\n"
|
|
" mov %1, %0\n"
|
|
" membar #StoreLoad | #StoreStore\n"
|
|
: "=&r" (val), "=&r" (tmp1), "=&r" (tmp2)
|
|
: "0" (val), "r" (m)
|
|
: "cc", "memory");
|
|
return val;
|
|
}
|
|
|
|
#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
|
|
#define tas(ptr) (xchg((ptr),1))
|
|
|
|
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 xchg32(ptr, x);
|
|
case 8:
|
|
return xchg64(ptr, x);
|
|
};
|
|
__xchg_called_with_bad_pointer();
|
|
return x;
|
|
}
|
|
|
|
extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn));
|
|
|
|
/*
|
|
* Atomic compare and exchange. Compare OLD with MEM, if identical,
|
|
* store NEW in MEM. Return the initial value in MEM. Success is
|
|
* indicated by comparing RETURN with OLD.
|
|
*/
|
|
|
|
#define __HAVE_ARCH_CMPXCHG 1
|
|
|
|
static __inline__ unsigned long
|
|
__cmpxchg_u32(volatile int *m, int old, int new)
|
|
{
|
|
__asm__ __volatile__("membar #StoreLoad | #LoadLoad\n"
|
|
"cas [%2], %3, %0\n\t"
|
|
"membar #StoreLoad | #StoreStore"
|
|
: "=&r" (new)
|
|
: "0" (new), "r" (m), "r" (old)
|
|
: "memory");
|
|
|
|
return new;
|
|
}
|
|
|
|
static __inline__ unsigned long
|
|
__cmpxchg_u64(volatile long *m, unsigned long old, unsigned long new)
|
|
{
|
|
__asm__ __volatile__("membar #StoreLoad | #LoadLoad\n"
|
|
"casx [%2], %3, %0\n\t"
|
|
"membar #StoreLoad | #StoreStore"
|
|
: "=&r" (new)
|
|
: "0" (new), "r" (m), "r" (old)
|
|
: "memory");
|
|
|
|
return new;
|
|
}
|
|
|
|
/* This function doesn't exist, so you'll get a linker error
|
|
if something tries to do an invalid cmpxchg(). */
|
|
extern void __cmpxchg_called_with_bad_pointer(void);
|
|
|
|
static __inline__ unsigned long
|
|
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
|
|
{
|
|
switch (size) {
|
|
case 4:
|
|
return __cmpxchg_u32(ptr, old, new);
|
|
case 8:
|
|
return __cmpxchg_u64(ptr, old, new);
|
|
}
|
|
__cmpxchg_called_with_bad_pointer();
|
|
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))); \
|
|
})
|
|
|
|
#endif /* !(__ASSEMBLY__) */
|
|
|
|
#define arch_align_stack(x) (x)
|
|
|
|
#endif /* !(__SPARC64_SYSTEM_H) */
|