667 lines
17 KiB
C
Executable file
667 lines
17 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/alpha/kernel/sys_dp264.c
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*
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* Copyright (C) 1995 David A Rusling
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* Copyright (C) 1996, 1999 Jay A Estabrook
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* Copyright (C) 1998, 1999 Richard Henderson
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*
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* Modified by Christopher C. Chimelis, 2001 to
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* add support for the addition of Shark to the
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* Tsunami family.
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*
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* Code supporting the DP264 (EV6+TSUNAMI).
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <asm/ptrace.h>
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#include <asm/dma.h>
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#include <asm/irq.h>
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#include <asm/mmu_context.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/core_tsunami.h>
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#include <asm/hwrpb.h>
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#include <asm/tlbflush.h>
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#include "proto.h"
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#include "irq_impl.h"
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#include "pci_impl.h"
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#include "machvec_impl.h"
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/* Note mask bit is true for ENABLED irqs. */
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static unsigned long cached_irq_mask;
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/* dp264 boards handle at max four CPUs */
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static unsigned long cpu_irq_affinity[4] = { 0UL, 0UL, 0UL, 0UL };
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DEFINE_SPINLOCK(dp264_irq_lock);
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static void
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tsunami_update_irq_hw(unsigned long mask)
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{
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register tsunami_cchip *cchip = TSUNAMI_cchip;
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unsigned long isa_enable = 1UL << 55;
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register int bcpu = boot_cpuid;
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#ifdef CONFIG_SMP
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volatile unsigned long *dim0, *dim1, *dim2, *dim3;
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unsigned long mask0, mask1, mask2, mask3, dummy;
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mask &= ~isa_enable;
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mask0 = mask & cpu_irq_affinity[0];
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mask1 = mask & cpu_irq_affinity[1];
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mask2 = mask & cpu_irq_affinity[2];
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mask3 = mask & cpu_irq_affinity[3];
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if (bcpu == 0) mask0 |= isa_enable;
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else if (bcpu == 1) mask1 |= isa_enable;
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else if (bcpu == 2) mask2 |= isa_enable;
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else mask3 |= isa_enable;
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dim0 = &cchip->dim0.csr;
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dim1 = &cchip->dim1.csr;
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dim2 = &cchip->dim2.csr;
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dim3 = &cchip->dim3.csr;
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if (!cpu_possible(0)) dim0 = &dummy;
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if (!cpu_possible(1)) dim1 = &dummy;
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if (!cpu_possible(2)) dim2 = &dummy;
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if (!cpu_possible(3)) dim3 = &dummy;
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*dim0 = mask0;
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*dim1 = mask1;
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*dim2 = mask2;
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*dim3 = mask3;
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mb();
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*dim0;
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*dim1;
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*dim2;
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*dim3;
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#else
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volatile unsigned long *dimB;
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if (bcpu == 0) dimB = &cchip->dim0.csr;
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else if (bcpu == 1) dimB = &cchip->dim1.csr;
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else if (bcpu == 2) dimB = &cchip->dim2.csr;
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else dimB = &cchip->dim3.csr;
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*dimB = mask | isa_enable;
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mb();
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*dimB;
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#endif
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}
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static void
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dp264_enable_irq(struct irq_data *d)
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{
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spin_lock(&dp264_irq_lock);
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cached_irq_mask |= 1UL << d->irq;
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tsunami_update_irq_hw(cached_irq_mask);
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spin_unlock(&dp264_irq_lock);
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}
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static void
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dp264_disable_irq(struct irq_data *d)
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{
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spin_lock(&dp264_irq_lock);
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cached_irq_mask &= ~(1UL << d->irq);
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tsunami_update_irq_hw(cached_irq_mask);
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spin_unlock(&dp264_irq_lock);
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}
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static void
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clipper_enable_irq(struct irq_data *d)
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{
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spin_lock(&dp264_irq_lock);
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cached_irq_mask |= 1UL << (d->irq - 16);
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tsunami_update_irq_hw(cached_irq_mask);
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spin_unlock(&dp264_irq_lock);
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}
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static void
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clipper_disable_irq(struct irq_data *d)
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{
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spin_lock(&dp264_irq_lock);
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cached_irq_mask &= ~(1UL << (d->irq - 16));
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tsunami_update_irq_hw(cached_irq_mask);
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spin_unlock(&dp264_irq_lock);
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}
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static void
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cpu_set_irq_affinity(unsigned int irq, cpumask_t affinity)
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{
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int cpu;
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for (cpu = 0; cpu < 4; cpu++) {
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unsigned long aff = cpu_irq_affinity[cpu];
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if (cpumask_test_cpu(cpu, &affinity))
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aff |= 1UL << irq;
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else
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aff &= ~(1UL << irq);
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cpu_irq_affinity[cpu] = aff;
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}
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}
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static int
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dp264_set_affinity(struct irq_data *d, const struct cpumask *affinity,
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bool force)
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{
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spin_lock(&dp264_irq_lock);
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cpu_set_irq_affinity(d->irq, *affinity);
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tsunami_update_irq_hw(cached_irq_mask);
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spin_unlock(&dp264_irq_lock);
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return 0;
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}
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static int
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clipper_set_affinity(struct irq_data *d, const struct cpumask *affinity,
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bool force)
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{
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spin_lock(&dp264_irq_lock);
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cpu_set_irq_affinity(d->irq - 16, *affinity);
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tsunami_update_irq_hw(cached_irq_mask);
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spin_unlock(&dp264_irq_lock);
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return 0;
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}
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static struct irq_chip dp264_irq_type = {
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.name = "DP264",
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.irq_unmask = dp264_enable_irq,
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.irq_mask = dp264_disable_irq,
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.irq_mask_ack = dp264_disable_irq,
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.irq_set_affinity = dp264_set_affinity,
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};
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static struct irq_chip clipper_irq_type = {
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.name = "CLIPPER",
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.irq_unmask = clipper_enable_irq,
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.irq_mask = clipper_disable_irq,
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.irq_mask_ack = clipper_disable_irq,
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.irq_set_affinity = clipper_set_affinity,
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};
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static void
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dp264_device_interrupt(unsigned long vector)
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{
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unsigned long pld;
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unsigned int i;
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/* Read the interrupt summary register of TSUNAMI */
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pld = TSUNAMI_cchip->dir0.csr;
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/*
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* Now for every possible bit set, work through them and call
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* the appropriate interrupt handler.
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*/
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while (pld) {
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i = ffz(~pld);
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pld &= pld - 1; /* clear least bit set */
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if (i == 55)
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isa_device_interrupt(vector);
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else
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handle_irq(16 + i);
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}
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}
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static void
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dp264_srm_device_interrupt(unsigned long vector)
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{
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int irq;
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irq = (vector - 0x800) >> 4;
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/*
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* The SRM console reports PCI interrupts with a vector calculated by:
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*
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* 0x900 + (0x10 * DRIR-bit)
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*
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* So bit 16 shows up as IRQ 32, etc.
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*
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* On DP264/BRICK/MONET, we adjust it down by 16 because at least
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* that many of the low order bits of the DRIR are not used, and
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* so we don't count them.
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*/
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if (irq >= 32)
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irq -= 16;
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handle_irq(irq);
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}
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static void
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clipper_srm_device_interrupt(unsigned long vector)
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{
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int irq;
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irq = (vector - 0x800) >> 4;
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/*
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* The SRM console reports PCI interrupts with a vector calculated by:
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*
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* 0x900 + (0x10 * DRIR-bit)
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*
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* So bit 16 shows up as IRQ 32, etc.
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*
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* CLIPPER uses bits 8-47 for PCI interrupts, so we do not need
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* to scale down the vector reported, we just use it.
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*
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* Eg IRQ 24 is DRIR bit 8, etc, etc
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*/
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handle_irq(irq);
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}
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static void __init
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init_tsunami_irqs(struct irq_chip * ops, int imin, int imax)
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{
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long i;
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for (i = imin; i <= imax; ++i) {
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irq_set_chip_and_handler(i, ops, handle_level_irq);
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irq_set_status_flags(i, IRQ_LEVEL);
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}
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}
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static void __init
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dp264_init_irq(void)
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{
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outb(0, DMA1_RESET_REG);
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outb(0, DMA2_RESET_REG);
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outb(DMA_MODE_CASCADE, DMA2_MODE_REG);
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outb(0, DMA2_MASK_REG);
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if (alpha_using_srm)
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alpha_mv.device_interrupt = dp264_srm_device_interrupt;
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tsunami_update_irq_hw(0);
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init_i8259a_irqs();
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init_tsunami_irqs(&dp264_irq_type, 16, 47);
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}
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static void __init
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clipper_init_irq(void)
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{
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outb(0, DMA1_RESET_REG);
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outb(0, DMA2_RESET_REG);
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outb(DMA_MODE_CASCADE, DMA2_MODE_REG);
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outb(0, DMA2_MASK_REG);
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if (alpha_using_srm)
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alpha_mv.device_interrupt = clipper_srm_device_interrupt;
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tsunami_update_irq_hw(0);
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init_i8259a_irqs();
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init_tsunami_irqs(&clipper_irq_type, 24, 63);
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}
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/*
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* PCI Fixup configuration.
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*
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* Summary @ TSUNAMI_CSR_DIM0:
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* Bit Meaning
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* 0-17 Unused
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*18 Interrupt SCSI B (Adaptec 7895 builtin)
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*19 Interrupt SCSI A (Adaptec 7895 builtin)
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*20 Interrupt Line D from slot 2 PCI0
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*21 Interrupt Line C from slot 2 PCI0
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*22 Interrupt Line B from slot 2 PCI0
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*23 Interrupt Line A from slot 2 PCI0
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*24 Interrupt Line D from slot 1 PCI0
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*25 Interrupt Line C from slot 1 PCI0
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*26 Interrupt Line B from slot 1 PCI0
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*27 Interrupt Line A from slot 1 PCI0
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*28 Interrupt Line D from slot 0 PCI0
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*29 Interrupt Line C from slot 0 PCI0
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*30 Interrupt Line B from slot 0 PCI0
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*31 Interrupt Line A from slot 0 PCI0
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*
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*32 Interrupt Line D from slot 3 PCI1
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*33 Interrupt Line C from slot 3 PCI1
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*34 Interrupt Line B from slot 3 PCI1
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*35 Interrupt Line A from slot 3 PCI1
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*36 Interrupt Line D from slot 2 PCI1
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*37 Interrupt Line C from slot 2 PCI1
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*38 Interrupt Line B from slot 2 PCI1
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*39 Interrupt Line A from slot 2 PCI1
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*40 Interrupt Line D from slot 1 PCI1
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*41 Interrupt Line C from slot 1 PCI1
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*42 Interrupt Line B from slot 1 PCI1
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*43 Interrupt Line A from slot 1 PCI1
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*44 Interrupt Line D from slot 0 PCI1
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*45 Interrupt Line C from slot 0 PCI1
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*46 Interrupt Line B from slot 0 PCI1
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*47 Interrupt Line A from slot 0 PCI1
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*48-52 Unused
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*53 PCI0 NMI (from Cypress)
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*54 PCI0 SMI INT (from Cypress)
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*55 PCI0 ISA Interrupt (from Cypress)
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*56-60 Unused
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*61 PCI1 Bus Error
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*62 PCI0 Bus Error
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*63 Reserved
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*
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* IdSel
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* 5 Cypress Bridge I/O
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* 6 SCSI Adaptec builtin
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* 7 64 bit PCI option slot 0 (all busses)
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* 8 64 bit PCI option slot 1 (all busses)
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* 9 64 bit PCI option slot 2 (all busses)
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* 10 64 bit PCI option slot 3 (not bus 0)
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*/
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static int
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isa_irq_fixup(const struct pci_dev *dev, int irq)
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{
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u8 irq8;
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if (irq > 0)
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return irq;
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/* This interrupt is routed via ISA bridge, so we'll
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just have to trust whatever value the console might
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have assigned. */
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pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq8);
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return irq8 & 0xf;
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}
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static int
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dp264_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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static char irq_tab[6][5] = {
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/*INT INTA INTB INTC INTD */
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{ -1, -1, -1, -1, -1}, /* IdSel 5 ISA Bridge */
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{ 16+ 3, 16+ 3, 16+ 2, 16+ 2, 16+ 2}, /* IdSel 6 SCSI builtin*/
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{ 16+15, 16+15, 16+14, 16+13, 16+12}, /* IdSel 7 slot 0 */
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{ 16+11, 16+11, 16+10, 16+ 9, 16+ 8}, /* IdSel 8 slot 1 */
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{ 16+ 7, 16+ 7, 16+ 6, 16+ 5, 16+ 4}, /* IdSel 9 slot 2 */
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{ 16+ 3, 16+ 3, 16+ 2, 16+ 1, 16+ 0} /* IdSel 10 slot 3 */
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};
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const long min_idsel = 5, max_idsel = 10, irqs_per_slot = 5;
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struct pci_controller *hose = dev->sysdata;
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int irq = COMMON_TABLE_LOOKUP;
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if (irq > 0)
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irq += 16 * hose->index;
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return isa_irq_fixup(dev, irq);
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}
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static int
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monet_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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static char irq_tab[13][5] = {
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/*INT INTA INTB INTC INTD */
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{ 45, 45, 45, 45, 45}, /* IdSel 3 21143 PCI1 */
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{ -1, -1, -1, -1, -1}, /* IdSel 4 unused */
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{ -1, -1, -1, -1, -1}, /* IdSel 5 unused */
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{ 47, 47, 47, 47, 47}, /* IdSel 6 SCSI PCI1 */
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{ -1, -1, -1, -1, -1}, /* IdSel 7 ISA Bridge */
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{ -1, -1, -1, -1, -1}, /* IdSel 8 P2P PCI1 */
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#if 1
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{ 28, 28, 29, 30, 31}, /* IdSel 14 slot 4 PCI2*/
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{ 24, 24, 25, 26, 27}, /* IdSel 15 slot 5 PCI2*/
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#else
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{ -1, -1, -1, -1, -1}, /* IdSel 9 unused */
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{ -1, -1, -1, -1, -1}, /* IdSel 10 unused */
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#endif
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{ 40, 40, 41, 42, 43}, /* IdSel 11 slot 1 PCI0*/
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{ 36, 36, 37, 38, 39}, /* IdSel 12 slot 2 PCI0*/
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{ 32, 32, 33, 34, 35}, /* IdSel 13 slot 3 PCI0*/
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{ 28, 28, 29, 30, 31}, /* IdSel 14 slot 4 PCI2*/
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{ 24, 24, 25, 26, 27} /* IdSel 15 slot 5 PCI2*/
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};
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const long min_idsel = 3, max_idsel = 15, irqs_per_slot = 5;
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return isa_irq_fixup(dev, COMMON_TABLE_LOOKUP);
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}
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static u8
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monet_swizzle(struct pci_dev *dev, u8 *pinp)
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{
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struct pci_controller *hose = dev->sysdata;
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int slot, pin = *pinp;
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if (!dev->bus->parent) {
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slot = PCI_SLOT(dev->devfn);
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}
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/* Check for the built-in bridge on hose 1. */
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else if (hose->index == 1 && PCI_SLOT(dev->bus->self->devfn) == 8) {
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slot = PCI_SLOT(dev->devfn);
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} else {
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/* Must be a card-based bridge. */
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do {
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/* Check for built-in bridge on hose 1. */
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if (hose->index == 1 &&
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PCI_SLOT(dev->bus->self->devfn) == 8) {
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slot = PCI_SLOT(dev->devfn);
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break;
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}
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pin = pci_swizzle_interrupt_pin(dev, pin);
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/* Move up the chain of bridges. */
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dev = dev->bus->self;
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/* Slot of the next bridge. */
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slot = PCI_SLOT(dev->devfn);
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} while (dev->bus->self);
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}
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*pinp = pin;
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return slot;
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}
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static int
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webbrick_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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static char irq_tab[13][5] = {
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/*INT INTA INTB INTC INTD */
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{ -1, -1, -1, -1, -1}, /* IdSel 7 ISA Bridge */
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{ -1, -1, -1, -1, -1}, /* IdSel 8 unused */
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{ 29, 29, 29, 29, 29}, /* IdSel 9 21143 #1 */
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{ -1, -1, -1, -1, -1}, /* IdSel 10 unused */
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{ 30, 30, 30, 30, 30}, /* IdSel 11 21143 #2 */
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{ -1, -1, -1, -1, -1}, /* IdSel 12 unused */
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{ -1, -1, -1, -1, -1}, /* IdSel 13 unused */
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{ 35, 35, 34, 33, 32}, /* IdSel 14 slot 0 */
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{ 39, 39, 38, 37, 36}, /* IdSel 15 slot 1 */
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{ 43, 43, 42, 41, 40}, /* IdSel 16 slot 2 */
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{ 47, 47, 46, 45, 44}, /* IdSel 17 slot 3 */
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};
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const long min_idsel = 7, max_idsel = 17, irqs_per_slot = 5;
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return isa_irq_fixup(dev, COMMON_TABLE_LOOKUP);
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}
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static int
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clipper_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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{
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static char irq_tab[7][5] = {
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/*INT INTA INTB INTC INTD */
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{ 16+ 8, 16+ 8, 16+ 9, 16+10, 16+11}, /* IdSel 1 slot 1 */
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{ 16+12, 16+12, 16+13, 16+14, 16+15}, /* IdSel 2 slot 2 */
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{ 16+16, 16+16, 16+17, 16+18, 16+19}, /* IdSel 3 slot 3 */
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{ 16+20, 16+20, 16+21, 16+22, 16+23}, /* IdSel 4 slot 4 */
|
|
{ 16+24, 16+24, 16+25, 16+26, 16+27}, /* IdSel 5 slot 5 */
|
|
{ 16+28, 16+28, 16+29, 16+30, 16+31}, /* IdSel 6 slot 6 */
|
|
{ -1, -1, -1, -1, -1} /* IdSel 7 ISA Bridge */
|
|
};
|
|
const long min_idsel = 1, max_idsel = 7, irqs_per_slot = 5;
|
|
struct pci_controller *hose = dev->sysdata;
|
|
int irq = COMMON_TABLE_LOOKUP;
|
|
|
|
if (irq > 0)
|
|
irq += 16 * hose->index;
|
|
|
|
return isa_irq_fixup(dev, irq);
|
|
}
|
|
|
|
static void __init
|
|
dp264_init_pci(void)
|
|
{
|
|
common_init_pci();
|
|
SMC669_Init(0);
|
|
locate_and_init_vga(NULL);
|
|
}
|
|
|
|
static void __init
|
|
monet_init_pci(void)
|
|
{
|
|
common_init_pci();
|
|
SMC669_Init(1);
|
|
es1888_init();
|
|
locate_and_init_vga(NULL);
|
|
}
|
|
|
|
static void __init
|
|
clipper_init_pci(void)
|
|
{
|
|
common_init_pci();
|
|
locate_and_init_vga(NULL);
|
|
}
|
|
|
|
static void __init
|
|
webbrick_init_arch(void)
|
|
{
|
|
tsunami_init_arch();
|
|
|
|
/* Tsunami caches 4 PTEs at a time; DS10 has only 1 hose. */
|
|
hose_head->sg_isa->align_entry = 4;
|
|
hose_head->sg_pci->align_entry = 4;
|
|
}
|
|
|
|
|
|
/*
|
|
* The System Vectors
|
|
*/
|
|
|
|
struct alpha_machine_vector dp264_mv __initmv = {
|
|
.vector_name = "DP264",
|
|
DO_EV6_MMU,
|
|
DO_DEFAULT_RTC,
|
|
DO_TSUNAMI_IO,
|
|
.machine_check = tsunami_machine_check,
|
|
.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
|
|
.min_io_address = DEFAULT_IO_BASE,
|
|
.min_mem_address = DEFAULT_MEM_BASE,
|
|
.pci_dac_offset = TSUNAMI_DAC_OFFSET,
|
|
|
|
.nr_irqs = 64,
|
|
.device_interrupt = dp264_device_interrupt,
|
|
|
|
.init_arch = tsunami_init_arch,
|
|
.init_irq = dp264_init_irq,
|
|
.init_rtc = common_init_rtc,
|
|
.init_pci = dp264_init_pci,
|
|
.kill_arch = tsunami_kill_arch,
|
|
.pci_map_irq = dp264_map_irq,
|
|
.pci_swizzle = common_swizzle,
|
|
};
|
|
ALIAS_MV(dp264)
|
|
|
|
struct alpha_machine_vector monet_mv __initmv = {
|
|
.vector_name = "Monet",
|
|
DO_EV6_MMU,
|
|
DO_DEFAULT_RTC,
|
|
DO_TSUNAMI_IO,
|
|
.machine_check = tsunami_machine_check,
|
|
.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
|
|
.min_io_address = DEFAULT_IO_BASE,
|
|
.min_mem_address = DEFAULT_MEM_BASE,
|
|
.pci_dac_offset = TSUNAMI_DAC_OFFSET,
|
|
|
|
.nr_irqs = 64,
|
|
.device_interrupt = dp264_device_interrupt,
|
|
|
|
.init_arch = tsunami_init_arch,
|
|
.init_irq = dp264_init_irq,
|
|
.init_rtc = common_init_rtc,
|
|
.init_pci = monet_init_pci,
|
|
.kill_arch = tsunami_kill_arch,
|
|
.pci_map_irq = monet_map_irq,
|
|
.pci_swizzle = monet_swizzle,
|
|
};
|
|
|
|
struct alpha_machine_vector webbrick_mv __initmv = {
|
|
.vector_name = "Webbrick",
|
|
DO_EV6_MMU,
|
|
DO_DEFAULT_RTC,
|
|
DO_TSUNAMI_IO,
|
|
.machine_check = tsunami_machine_check,
|
|
.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
|
|
.min_io_address = DEFAULT_IO_BASE,
|
|
.min_mem_address = DEFAULT_MEM_BASE,
|
|
.pci_dac_offset = TSUNAMI_DAC_OFFSET,
|
|
|
|
.nr_irqs = 64,
|
|
.device_interrupt = dp264_device_interrupt,
|
|
|
|
.init_arch = webbrick_init_arch,
|
|
.init_irq = dp264_init_irq,
|
|
.init_rtc = common_init_rtc,
|
|
.init_pci = common_init_pci,
|
|
.kill_arch = tsunami_kill_arch,
|
|
.pci_map_irq = webbrick_map_irq,
|
|
.pci_swizzle = common_swizzle,
|
|
};
|
|
|
|
struct alpha_machine_vector clipper_mv __initmv = {
|
|
.vector_name = "Clipper",
|
|
DO_EV6_MMU,
|
|
DO_DEFAULT_RTC,
|
|
DO_TSUNAMI_IO,
|
|
.machine_check = tsunami_machine_check,
|
|
.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
|
|
.min_io_address = DEFAULT_IO_BASE,
|
|
.min_mem_address = DEFAULT_MEM_BASE,
|
|
.pci_dac_offset = TSUNAMI_DAC_OFFSET,
|
|
|
|
.nr_irqs = 64,
|
|
.device_interrupt = dp264_device_interrupt,
|
|
|
|
.init_arch = tsunami_init_arch,
|
|
.init_irq = clipper_init_irq,
|
|
.init_rtc = common_init_rtc,
|
|
.init_pci = clipper_init_pci,
|
|
.kill_arch = tsunami_kill_arch,
|
|
.pci_map_irq = clipper_map_irq,
|
|
.pci_swizzle = common_swizzle,
|
|
};
|
|
|
|
/* Sharks strongly resemble Clipper, at least as far
|
|
* as interrupt routing, etc, so we're using the
|
|
* same functions as Clipper does
|
|
*/
|
|
|
|
struct alpha_machine_vector shark_mv __initmv = {
|
|
.vector_name = "Shark",
|
|
DO_EV6_MMU,
|
|
DO_DEFAULT_RTC,
|
|
DO_TSUNAMI_IO,
|
|
.machine_check = tsunami_machine_check,
|
|
.max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
|
|
.min_io_address = DEFAULT_IO_BASE,
|
|
.min_mem_address = DEFAULT_MEM_BASE,
|
|
.pci_dac_offset = TSUNAMI_DAC_OFFSET,
|
|
|
|
.nr_irqs = 64,
|
|
.device_interrupt = dp264_device_interrupt,
|
|
|
|
.init_arch = tsunami_init_arch,
|
|
.init_irq = clipper_init_irq,
|
|
.init_rtc = common_init_rtc,
|
|
.init_pci = common_init_pci,
|
|
.kill_arch = tsunami_kill_arch,
|
|
.pci_map_irq = clipper_map_irq,
|
|
.pci_swizzle = common_swizzle,
|
|
};
|
|
|
|
/* No alpha_mv alias for webbrick/monet/clipper, since we compile them
|
|
in unconditionally with DP264; setup_arch knows how to cope. */
|