cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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apm_emu.c (2775B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * APM emulation for PMU-based machines
      4 *
      5 * Copyright 2001 Benjamin Herrenschmidt (benh@kernel.crashing.org)
      6 */
      7
      8#include <linux/kernel.h>
      9#include <linux/module.h>
     10#include <linux/apm-emulation.h>
     11#include <linux/adb.h>
     12#include <linux/pmu.h>
     13
     14#define APM_CRITICAL		10
     15#define APM_LOW			30
     16
     17static void pmu_apm_get_power_status(struct apm_power_info *info)
     18{
     19	int percentage = -1;
     20	int batteries = 0;
     21	int time_units = -1;
     22	int real_count = 0;
     23	int i;
     24	char charging = 0;
     25	long charge = -1;
     26	long amperage = 0;
     27	unsigned long btype = 0;
     28
     29	info->battery_status = APM_BATTERY_STATUS_UNKNOWN;
     30	info->battery_flag = APM_BATTERY_FLAG_UNKNOWN;
     31	info->units = APM_UNITS_MINS;
     32
     33	if (pmu_power_flags & PMU_PWR_AC_PRESENT)
     34		info->ac_line_status = APM_AC_ONLINE;
     35	else
     36		info->ac_line_status = APM_AC_OFFLINE;
     37
     38	for (i=0; i<pmu_battery_count; i++) {
     39		if (pmu_batteries[i].flags & PMU_BATT_PRESENT) {
     40			batteries++;
     41			if (percentage < 0)
     42				percentage = 0;
     43			if (charge < 0)
     44				charge = 0;
     45			percentage += (pmu_batteries[i].charge * 100) /
     46				pmu_batteries[i].max_charge;
     47			charge += pmu_batteries[i].charge;
     48			amperage += pmu_batteries[i].amperage;
     49			if (btype == 0)
     50				btype = (pmu_batteries[i].flags & PMU_BATT_TYPE_MASK);
     51			real_count++;
     52			if ((pmu_batteries[i].flags & PMU_BATT_CHARGING))
     53				charging++;
     54		}
     55	}
     56	if (batteries == 0)
     57		info->ac_line_status = APM_AC_ONLINE;
     58
     59	if (real_count) {
     60		if (amperage < 0) {
     61			if (btype == PMU_BATT_TYPE_SMART)
     62				time_units = (charge * 59) / (amperage * -1);
     63			else
     64				time_units = (charge * 16440) / (amperage * -60);
     65		}
     66		percentage /= real_count;
     67		if (charging > 0) {
     68			info->battery_status = APM_BATTERY_STATUS_CHARGING;
     69			info->battery_flag = APM_BATTERY_FLAG_CHARGING;
     70		} else if (percentage <= APM_CRITICAL) {
     71			info->battery_status = APM_BATTERY_STATUS_CRITICAL;
     72			info->battery_flag = APM_BATTERY_FLAG_CRITICAL;
     73		} else if (percentage <= APM_LOW) {
     74			info->battery_status = APM_BATTERY_STATUS_LOW;
     75			info->battery_flag = APM_BATTERY_FLAG_LOW;
     76		} else {
     77			info->battery_status = APM_BATTERY_STATUS_HIGH;
     78			info->battery_flag = APM_BATTERY_FLAG_HIGH;
     79		}
     80	}
     81
     82	info->battery_life = percentage;
     83	info->time = time_units;
     84}
     85
     86static int __init apm_emu_init(void)
     87{
     88	apm_get_power_status = pmu_apm_get_power_status;
     89
     90	printk(KERN_INFO "apm_emu: PMU APM Emulation initialized.\n");
     91
     92	return 0;
     93}
     94
     95static void __exit apm_emu_exit(void)
     96{
     97	if (apm_get_power_status == pmu_apm_get_power_status)
     98		apm_get_power_status = NULL;
     99
    100	printk(KERN_INFO "apm_emu: PMU APM Emulation removed.\n");
    101}
    102
    103module_init(apm_emu_init);
    104module_exit(apm_emu_exit);
    105
    106MODULE_AUTHOR("Benjamin Herrenschmidt");
    107MODULE_DESCRIPTION("APM emulation for PowerMac");
    108MODULE_LICENSE("GPL");