/*

• Copyright © 2015-2020, ARM Limited and Contributors. All rights reserved.
• SPDX-License-Identifier: BSD-3-Clause
  */

#include <assert.h>

#include <drivers/arm/gic_common.h>
#include <lib/mmio.h>

#include “…/common/gic_common_private.h”

1-GIC分发器接口访问器，用于读取整个寄存器

/*******************************************************************************

• GIC Distributor interface accessors for reading entire registers
  *****************************************************************************/
  /

• Accessor to read the GIC Distributor IGROUPR corresponding to the interrupt

• id, 32 interrupt ids at a time.
  */
  unsigned int gicd_read_igroupr(uintptr_t base, unsigned int id)
  {
  unsigned int n = id >> IGROUPR_SHIFT;

  return mmio_read_32(base + GICD_IGROUPR + (n << 2));
  }

1-gicd_read_isenabler

访问器读取与中断“id”对应的GIC分发器ISENABLER，一次32个中断id。
/
/

• Accessor to read the GIC Distributor ISENABLER corresponding to the

• interrupt id, 32 interrupt ids at a time.
  */
  unsigned int gicd_read_isenabler(uintptr_t base, unsigned int id)
  {
  unsigned int n = id >> ISENABLER_SHIFT;

  return mmio_read_32(base + GICD_ISENABLER + (n << 2));
  }

/*

• Accessor to read the GIC Distributor ICENABLER corresponding to the

• interrupt id, 32 interrupt IDs at a time.
  */
  unsigned int gicd_read_icenabler(uintptr_t base, unsigned int id)
  {
  unsigned int n = id >> ICENABLER_SHIFT;

  return mmio_read_32(base + GICD_ICENABLER + (n << 2));
  }

/*

• Accessor to read the GIC Distributor ISPENDR corresponding to the

• interrupt id, 32 interrupt IDs at a time.
  */
  unsigned int gicd_read_ispendr(uintptr_t base, unsigned int id)
  {
  unsigned int n = id >> ISPENDR_SHIFT;

  return mmio_read_32(base + GICD_ISPENDR + (n << 2));
  }

/*

• Accessor to read the GIC Distributor ICPENDR corresponding to the

• interrupt id, 32 interrupt IDs at a time.
  */
  unsigned int gicd_read_icpendr(uintptr_t base, unsigned int id)
  {
  unsigned int n = id >> ICPENDR_SHIFT;

  return mmio_read_32(base + GICD_ICPENDR + (n << 2));
  }

/*

• Accessor to read the GIC Distributor ISACTIVER corresponding to the

• interrupt id, 32 interrupt IDs at a time.
  */
  unsigned int gicd_read_isactiver(uintptr_t base, unsigned int id)
  {
  unsigned int n = id >> ISACTIVER_SHIFT;

  return mmio_read_32(base + GICD_ISACTIVER + (n << 2));
  }

/*

• Accessor to read the GIC Distributor ICACTIVER corresponding to the

• interrupt id, 32 interrupt IDs at a time.
  */
  unsigned int gicd_read_icactiver(uintptr_t base, unsigned int id)
  {
  unsigned int n = id >> ICACTIVER_SHIFT;

  return mmio_read_32(base + GICD_ICACTIVER + (n << 2));
  }

/*

• Accessor to read the GIC Distributor IPRIORITYR corresponding to the

• interrupt id, 4 interrupt IDs at a time.
  */
  unsigned int gicd_read_ipriorityr(uintptr_t base, unsigned int id)
  {
  unsigned int n = id >> IPRIORITYR_SHIFT;

  return mmio_read_32(base + GICD_IPRIORITYR + (n << 2));
  }

/*

• Accessor to read the GIC Distributor ICGFR corresponding to the

• interrupt id, 16 interrupt IDs at a time.
  */
  unsigned int gicd_read_icfgr(uintptr_t base, unsigned int id)
  {
  unsigned int n = id >> ICFGR_SHIFT;

  return mmio_read_32(base + GICD_ICFGR + (n << 2));
  }

/*

• Accessor to read the GIC Distributor NSACR corresponding to the

• interrupt id, 16 interrupt IDs at a time.
  */
  unsigned int gicd_read_nsacr(uintptr_t base, unsigned int id)
  {
  unsigned int n = id >> NSACR_SHIFT;

  return mmio_read_32(base + GICD_NSACR + (n << 2));
  }

2-GIC分发器接口访问器，用于写入整个寄存器

/*******************************************************************************

• GIC Distributor interface accessors for writing entire registers
  *****************************************************************************/
  /

• Accessor to write the GIC Distributor IGROUPR corresponding to the

• interrupt id, 32 interrupt IDs at a time.
  */
  void gicd_write_igroupr(uintptr_t base, unsigned int id, unsigned int val)
  {
  unsigned int n = id >> IGROUPR_SHIFT;

  mmio_write_32(base + GICD_IGROUPR + (n << 2), val);
  }

/*

• Accessor to write the GIC Distributor ISENABLER corresponding to the

• interrupt id, 32 interrupt IDs at a time.
  */
  void gicd_write_isenabler(uintptr_t base, unsigned int id, unsigned int val)
  {
  unsigned int n = id >> ISENABLER_SHIFT;

  mmio_write_32(base + GICD_ISENABLER + (n << 2), val);
  }

/*

• Accessor to write the GIC Distributor ICENABLER corresponding to the

• interrupt id, 32 interrupt IDs at a time.
  */
  void gicd_write_icenabler(uintptr_t base, unsigned int id, unsigned int val)
  {
  unsigned int n = id >> ICENABLER_SHIFT;

  mmio_write_32(base + GICD_ICENABLER + (n << 2), val);
  }

/*

• Accessor to write the GIC Distributor ISPENDR corresponding to the

• interrupt id, 32 interrupt IDs at a time.
  */
  void gicd_write_ispendr(uintptr_t base, unsigned int id, unsigned int val)
  {
  unsigned int n = id >> ISPENDR_SHIFT;

  mmio_write_32(base + GICD_ISPENDR + (n << 2), val);
  }

/*

• Accessor to write the GIC Distributor ICPENDR corresponding to the

• interrupt id, 32 interrupt IDs at a time.
  */
  void gicd_write_icpendr(uintptr_t base, unsigned int id, unsigned int val)
  {
  unsigned int n = id >> ICPENDR_SHIFT;

  mmio_write_32(base + GICD_ICPENDR + (n << 2), val);
  }

/*

• Accessor to write the GIC Distributor ISACTIVER corresponding to the

• interrupt id, 32 interrupt IDs at a time.
  */
  void gicd_write_isactiver(uintptr_t base, unsigned int id, unsigned int val)
  {
  unsigned int n = id >> ISACTIVER_SHIFT;

  mmio_write_32(base + GICD_ISACTIVER + (n << 2), val);
  }

/*

• Accessor to write the GIC Distributor ICACTIVER corresponding to the

• interrupt id, 32 interrupt IDs at a time.
  */
  void gicd_write_icactiver(uintptr_t base, unsigned int id, unsigned int val)
  {
  unsigned int n = id >> ICACTIVER_SHIFT;

  mmio_write_32(base + GICD_ICACTIVER + (n << 2), val);
  }

/*

• Accessor to write the GIC Distributor IPRIORITYR corresponding to the

• interrupt id, 4 interrupt IDs at a time.
  */
  void gicd_write_ipriorityr(uintptr_t base, unsigned int id, unsigned int val)
  {
  unsigned int n = id >> IPRIORITYR_SHIFT;

  mmio_write_32(base + GICD_IPRIORITYR + (n << 2), val);
  }

/*

• Accessor to write the GIC Distributor ICFGR corresponding to the

• interrupt id, 16 interrupt IDs at a time.
  */
  void gicd_write_icfgr(uintptr_t base, unsigned int id, unsigned int val)
  {
  unsigned int n = id >> ICFGR_SHIFT;

  mmio_write_32(base + GICD_ICFGR + (n << 2), val);
  }

/*

• Accessor to write the GIC Distributor NSACR corresponding to the

• interrupt id, 16 interrupt IDs at a time.
  */
  void gicd_write_nsacr(uintptr_t base, unsigned int id, unsigned int val)
  {
  unsigned int n = id >> NSACR_SHIFT;

  mmio_write_32(base + GICD_NSACR + (n << 2), val);
  }

3-GIC分配器用于访问与单个中断ID相对应的GIC寄存器的功能

GIC分配器用于访问与单个中断ID相对应的GIC寄存器的功能。这些功能使用按位操作或适当的寄存器访问来修改或返回与单个中断标识相对应的位字段。
/******************************************************************************

• GIC Distributor functions for accessing the GIC registers

• corresponding to a single interrupt ID. These functions use bitwise

• operations or appropriate register accesses to modify or return

• the bit-field corresponding the single interrupt ID.
  ******************************************************************************/
  unsigned int gicd_get_igroupr(uintptr_t base, unsigned int id)
  {
  unsigned int bit_num = id & ((1U << IGROUPR_SHIFT) - 1U);
  unsigned int reg_val = gicd_read_igroupr(base, id);

  return (reg_val >> bit_num) & 0x1U;
  }

void gicd_set_igroupr(uintptr_t base, unsigned int id)
{
unsigned int bit_num = id & ((1U << IGROUPR_SHIFT) - 1U);
unsigned int reg_val = gicd_read_igroupr(base, id);

gicd_write_igroupr(base, id, reg_val | (1U << bit_num));

}

void gicd_clr_igroupr(uintptr_t base, unsigned int id)
{
unsigned int bit_num = id & ((1U << IGROUPR_SHIFT) - 1U);
unsigned int reg_val = gicd_read_igroupr(base, id);

gicd_write_igroupr(base, id, reg_val & ~(1U << bit_num));

}

void gicd_set_isenabler(uintptr_t base, unsigned int id)
{
unsigned int bit_num = id & ((1U << ISENABLER_SHIFT) - 1U);

gicd_write_isenabler(base, id, (1U << bit_num));

}

void gicd_set_icenabler(uintptr_t base, unsigned int id)
{
unsigned int bit_num = id & ((1U << ICENABLER_SHIFT) - 1U);

gicd_write_icenabler(base, id, (1U << bit_num));

}

void gicd_set_ispendr(uintptr_t base, unsigned int id)
{
unsigned int bit_num = id & ((1U << ISPENDR_SHIFT) - 1U);

gicd_write_ispendr(base, id, (1U << bit_num));

}

void gicd_set_icpendr(uintptr_t base, unsigned int id)
{
unsigned int bit_num = id & ((1U << ICPENDR_SHIFT) - 1U);

gicd_write_icpendr(base, id, (1U << bit_num));

}

unsigned int gicd_get_isactiver(uintptr_t base, unsigned int id)
{
unsigned int bit_num = id & ((1U << ISACTIVER_SHIFT) - 1U);
unsigned int reg_val = gicd_read_isactiver(base, id);

return (reg_val >> bit_num) & 0x1U;

}

void gicd_set_isactiver(uintptr_t base, unsigned int id)
{
unsigned int bit_num = id & ((1U << ISACTIVER_SHIFT) - 1U);

gicd_write_isactiver(base, id, (1U << bit_num));

}

void gicd_set_icactiver(uintptr_t base, unsigned int id)
{
unsigned int bit_num = id & ((1U << ICACTIVER_SHIFT) - 1U);

gicd_write_icactiver(base, id, (1U << bit_num));

}

void gicd_set_ipriorityr(uintptr_t base, unsigned int id, unsigned int pri)
{
uint8_t val = pri & GIC_PRI_MASK;

mmio_write_8(base + GICD_IPRIORITYR + id, val);

}

void gicd_set_icfgr(uintptr_t base, unsigned int id, unsigned int cfg)
{
/* Interrupt configuration is a 2-bit field */
unsigned int bit_num = id & ((1U << ICFGR_SHIFT) - 1U);
unsigned int bit_shift = bit_num << 1;

uint32_t reg_val = gicd_read_icfgr(base, id);/* Clear the field, and insert required configuration */
reg_val &= ~(GIC_CFG_MASK << bit_shift);
reg_val |= ((cfg & GIC_CFG_MASK) << bit_shift);gicd_write_icfgr(base, id, reg_val);

}

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