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acpi-processor.c

/*
 * arch/ia64/kernel/acpi-processor.c
 *
 * Copyright (C) 2005 Intel Corporation
 *    Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
 *    - Added _PDC for platforms with Intel CPUs
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/acpi.h>

#include <acpi/processor.h>
#include <asm/acpi.h>

static void init_intel_pdc(struct acpi_processor *pr)
{
      struct acpi_object_list *obj_list;
      union acpi_object *obj;
      u32 *buf;

      /* allocate and initialize pdc. It will be used later. */
      obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
      if (!obj_list) {
            printk(KERN_ERR "Memory allocation error\n");
            return;
      }

      obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
      if (!obj) {
            printk(KERN_ERR "Memory allocation error\n");
            kfree(obj_list);
            return;
      }

      buf = kmalloc(12, GFP_KERNEL);
      if (!buf) {
            printk(KERN_ERR "Memory allocation error\n");
            kfree(obj);
            kfree(obj_list);
            return;
      }

      buf[0] = ACPI_PDC_REVISION_ID;
      buf[1] = 1;
      buf[2] = ACPI_PDC_EST_CAPABILITY_SMP;
      /*
       * The default of PDC_SMP_T_SWCOORD bit is set for IA64 cpu so
       * that OSPM is capable of native ACPI throttling software
       * coordination using BIOS supplied _TSD info.
       */
      buf[2] |= ACPI_PDC_SMP_T_SWCOORD;

      obj->type = ACPI_TYPE_BUFFER;
      obj->buffer.length = 12;
      obj->buffer.pointer = (u8 *) buf;
      obj_list->count = 1;
      obj_list->pointer = obj;
      pr->pdc = obj_list;

      return;
}

/* Initialize _PDC data based on the CPU vendor */
void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
{
      pr->pdc = NULL;
      init_intel_pdc(pr);
      return;
}

EXPORT_SYMBOL(arch_acpi_processor_init_pdc);

void arch_acpi_processor_cleanup_pdc(struct acpi_processor *pr)
{
      if (pr->pdc) {
            kfree(pr->pdc->pointer->buffer.pointer);
            kfree(pr->pdc->pointer);
            kfree(pr->pdc);
            pr->pdc = NULL;
      }
}

EXPORT_SYMBOL(arch_acpi_processor_cleanup_pdc);

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