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/* -*- c -*- */
/*
* Copyright 2007 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <gcell/gc_jd_stack.h>
#include <gcell/memory_barrier.h>
/*
* begin extract from ppu_intrinics.h
* FIXME handle this a different way
*/
#if !defined(__PPU__) && !defined(__ppc__) && !defined(__ppc64__)
&& !defined(__GNUC__)
#error ppu_intrinsics.h included on wrong platform/compiler
#endif
#define __lwarx(base) __extension__ \
({unsigned int result; \
typedef struct {char a[4];} wordsize; \
wordsize *ptrp = (wordsize*)(base); \
__asm__ volatile ("lwarx %0,%y1" \
: "=r" (result) \
: "Z" (*ptrp)); \
result; })
#ifdef __powerpc64__
#define __ldarx(base) __extension__ \
({unsigned long long result; \
typedef struct {char a[8];} doublewordsize; \
doublewordsize *ptrp = (doublewordsize*)(base); \
__asm__ volatile ("ldarx %0,%y1" \
: "=r" (result) \
: "Z" (*ptrp)); \
result; })
#endif /* __powerpc64__ */
#define __stwcx(base, value) __extension__ \
({unsigned int result; \
typedef struct {char a[4];} wordsize; \
wordsize *ptrp = (wordsize*)(base); \
__asm__ volatile ("stwcx. %2,%y1\n" \
"\tmfocrf %0,0x80" \
: "=r" (result), \
"=Z" (*ptrp) \
: "r" (value)); \
((result & 0x20000000) >> 29); })
#ifdef __powerpc64__
#define __stdcx(base, value) __extension__ \
({unsigned long long result; \
typedef struct {char a[8];} doublewordsize; \
doublewordsize *ptrp = (doublewordsize*)(base); \
__asm__ volatile ("stdcx. %2,%y1\n" \
"\tmfocrf %0,0x80" \
: "=r" (result), \
"=Z" (*ptrp) \
: "r" (value)); \
((result & 0x20000000) >> 29); })
#endif /* __powerpc64__ */
/*
* --- end extract from ppu_intrinics.h --
*/
void
gc_jd_stack_init(gc_jd_stack_t *stack)
{
stack->top = 0;
}
#ifdef __powerpc64__ // 64-bit mode
void
gc_jd_stack_push(gc_jd_stack_t *stack, gc_job_desc_t *item)
{
gc_eaddr_t top;
gc_eaddr_t item_ea = ptr_to_ea(item);
unsigned int done;
do {
top = __ldarx(&stack->top);
item->sys.next = top;
smp_wmb(); // order store of item->next before store of stack->top
done = __stdcx(&stack->top, item_ea);
} while (unlikely(done == 0));
}
gc_job_desc_t *
gc_jd_stack_pop(gc_jd_stack_t *stack)
{
gc_eaddr_t s;
gc_eaddr_t t;
unsigned int done;
do {
s = __ldarx(&stack->top);
if (s == 0) /* stack's empty */
return 0;
t = ((gc_job_desc_t *) ea_to_ptr(s))->sys.next;
done = __stdcx(&stack->top, t);
} while (unlikely(done == 0));
return ea_to_ptr(s);
}
#else // 32-bit mode
/*
* In 32-bit mode, gc_eaddr's will have the top 32-bits zero.
* The ldarx/stdcx instructions aren't available in 32-bit mode,
* thus we use lwarx/stwcx on the low 32-bits of the 64-bit addresses.
* Since we're big-endian, the low 32-bits are at word offset 1.
*/
void
gc_jd_stack_push(gc_jd_stack_t *stack, gc_job_desc_t *item)
{
gc_eaddr_t top;
unsigned int done;
do {
top = __lwarx((int32_t *)(&stack->top) + 1);
item->sys.next = top;
smp_wmb(); // order store of item->sys.next before store of stack->top
done = __stwcx((int32_t *)(&stack->top) + 1, item);
} while (unlikely(done == 0));
}
gc_job_desc_t *
gc_jd_stack_pop(gc_jd_stack_t *stack)
{
gc_eaddr_t s;
gc_eaddr_t t;
unsigned int done;
do {
s = __lwarx((int32_t *)(&stack->top) + 1);
if (s == 0) /* stack's empty */
return 0;
t = ((gc_job_desc_t *) ea_to_ptr(s))->sys.next;
done = __stwcx((int32_t *)(&stack->top) + 1, (uint32_t) t);
} while (unlikely(done == 0));
return ea_to_ptr(s);
}
#endif
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