/*
 * Atomic operations on 64-bit quantities.
 *
 * Copyright (C) 2017 Red Hat, Inc.
 *
 * Author: Paolo Bonzini <pbonzini@redhat.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 */

#include "qemu/osdep.h"
#include "qemu/atomic.h"
#include "qemu/stats64.h"
#include "qemu/processor.h"

#ifndef CONFIG_ATOMIC64
static inline void stat64_rdlock(Stat64 *s)
{
    /* Keep out incoming writers to avoid them starving us. */
    atomic_add(&s->lock, 2);

    /* If there is a concurrent writer, wait for it.  */
    while (atomic_read(&s->lock) & 1) {
        cpu_relax();
    }
}

static inline void stat64_rdunlock(Stat64 *s)
{
    atomic_sub(&s->lock, 2);
}

static inline bool stat64_wrtrylock(Stat64 *s)
{
    return atomic_cmpxchg(&s->lock, 0, 1) == 0;
}

static inline void stat64_wrunlock(Stat64 *s)
{
    atomic_dec(&s->lock);
}

uint64_t stat64_get(const Stat64 *s)
{
    uint32_t high, low;

    stat64_rdlock((Stat64 *)s);

    /* 64-bit writes always take the lock, so we can read in
     * any order.
     */
    high = atomic_read(&s->high);
    low = atomic_read(&s->low);
    stat64_rdunlock((Stat64 *)s);

    return ((uint64_t)high << 32) | low;
}

bool stat64_add32_carry(Stat64 *s, uint32_t low, uint32_t high)
{
    uint32_t old;

    if (!stat64_wrtrylock(s)) {
        cpu_relax();
        return false;
    }
  default y


   #### RTE-CB platform-specific config

   # Boards in the RTE-x-CB series
   config RTE_CB
   	  bool
	  depends RTE_CB_MA1 || RTE_CB_NB85E || RTE_CB_ME2
	  default y

   config RTE_CB_MULTI
   	  bool
	  # RTE_CB_NB85E can either have multi ROM support or not, but
	  # other platforms (currently only RTE_CB_MA1) require it.
	  prompt "Multi monitor ROM support" if RTE_CB_NB85E
	  depends RTE_CB_MA1 || RTE_CB_NB85E
	  default y

   config RTE_CB_MULTI_DBTRAP
   	  bool "Pass illegal insn trap / dbtrap to kernel"
	  depends RTE_CB_MULTI
	  default n

   config RTE_CB_MA1_KSRAM
   	  bool "Kernel in SRAM (limits size of kernel)"
	  depends RTE_CB_MA1 && RTE_CB_MULTI
	  default n

   config RTE_MB_A_PCI
   	  bool "Mother-A PCI support"
	  depends RTE_CB
	  default y

   # The GBUS is used to talk to the RTE-MOTHER-A board
   config RTE_GBUS_INT
   	  bool
	  depends RTE_MB_A_PCI
	  default y

   # The only PCI bus we support is on the RTE-MOTHER-A board
   config PCI
   	  bool
	  default RTE_MB_A_PCI

   #### Some feature-specific configs

   # Everything except for the GDB simulator uses the same interrupt controller
   config V850E_INTC
   	  bool
	  default !V850E_SIM

   # Everything except for the various simulators uses the "Timer D" unit
   config V850E_TIMER_D
   	  bool
	  default !V850E_SIM && !V850E2_SIM85E2

   # Cache control used on some v850e1 processors
   config V850E_CACHE
          bool
	  default V850E_TEG || V850E_ME2

   # Cache control used on v850e2 processors; I think this should
   # actually apply to more, but currently only the SIM85E2S uses it
   config V850E2_CACHE
   	  bool
	  default V850E2_SIM85E2S

   config NO_CACHE
   	  bool
	  default !V850E_CACHE && !V850E2_CACHE

   #### Misc config

   config ROM_KERNEL
   	  bool "Kernel in ROM"
	  depends V850E2_ANNA || V850E_AS85EP1 || RTE_CB_ME2

   # Some platforms pre-zero memory, in which case the kernel doesn't need to
   config ZERO_BSS
   	  bool
	  depends !V850E2_SIM85E2C
	  default y

   # The crappy-ass zone allocator requires that the start of allocatable
   # memory be aligned to the largest possible allocation.
   config FORCE_MAX_ZONEORDER
   	  int
	  default 8 if V850E2_SIM85E2C || V850E2_FPGA85E2C

   config V850E_HIGHRES_TIMER
   	  bool "High resolution timer support"
	  depends V850E_TIMER_D
   config TIME_BOOTUP
   	  bool "Time bootup"
	  depends V850E_HIGHRES_TIMER

   config RESET_GUARD
   	  bool "Reset Guard"

   config LARGE_ALLOCS
	  bool "Allow allocating large blocks (> 1MB) of memory"
	  help
	     Allow the slab memory allocator to keep chains for very large
	     memory sizes - upto 32MB. You may need this if your system has
	     a lot of RAM, and you need to able to allocate very large
	     contiguous chunks. If unsure, say N.

endmenu


#############################################################################

source init/Kconfig

#############################################################################

menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"

#    config PCI
# 	   bool "PCI support"
# 	   help
# 	     Support for PCI bus.

source "drivers/pci/Kconfig"

source "drivers/pcmcia/Kconfig"

source "drivers/pci/hotplug/Kconfig"

endmenu

menu "Executable file formats"

source "fs/Kconfig.binfmt"

endmenu

#############################################################################

source "drivers/base/Kconfig"

source drivers/mtd/Kconfig

source drivers/parport/Kconfig

#source drivers/pnp/Kconfig

source drivers/block/Kconfig

#############################################################################

menu "Disk device support"

source "drivers/ide/Kconfig"

source "drivers/scsi/Kconfig"

endmenu

#############################################################################


source "drivers/md/Kconfig"

source "drivers/message/fusion/Kconfig"

source "drivers/ieee1394/Kconfig"

source "drivers/message/i2o/Kconfig"

source "net/Kconfig"

source "drivers/isdn/Kconfig"

#source "drivers/telephony/Kconfig"

#
# input before char - char/joystick depends on it. As does USB.
#
source "drivers/input/Kconfig"

source "drivers/char/Kconfig"

#source drivers/misc/Config.in
source "drivers/media/Kconfig"

source "fs/Kconfig"

source "drivers/video/Kconfig"

source "sound/Kconfig"

source "drivers/usb/Kconfig"

source "arch/v850/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"

source "lib/Kconfig"

#############################################################################