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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pc873xx.c (1740B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/ioport.h>
      3#include <asm/io.h>
      4
      5#include "pc873xx.h"
      6
      7static unsigned pc873xx_probelist[] = {0x398, 0x26e, 0};
      8
      9static char *pc873xx_names[] = {
     10	"PC87303", "PC87306", "PC87312", "PC87332", "PC87334"
     11};
     12
     13static unsigned int base, model;
     14
     15
     16unsigned int __init pc873xx_get_base(void)
     17{
     18	return base;
     19}
     20
     21char *__init pc873xx_get_model(void)
     22{
     23	return pc873xx_names[model];
     24}
     25
     26static unsigned char __init pc873xx_read(unsigned int base, int reg)
     27{
     28	outb(reg, base);
     29	return inb(base + 1);
     30}
     31
     32static void __init pc873xx_write(unsigned int base, int reg, unsigned char data)
     33{
     34	unsigned long flags;
     35
     36	local_irq_save(flags);
     37	outb(reg, base);
     38	outb(data, base + 1);
     39	outb(data, base + 1);		/* Must be written twice */
     40	local_irq_restore(flags);
     41}
     42
     43int __init pc873xx_probe(void)
     44{
     45	int val, index = 0;
     46
     47	while ((base = pc873xx_probelist[index++])) {
     48
     49		if (request_region(base, 2, "Super IO PC873xx") == NULL)
     50			continue;
     51
     52		val = pc873xx_read(base, REG_SID);
     53		if ((val & 0xf0) == 0x10) {
     54			model = PC87332;
     55			break;
     56		} else if ((val & 0xf8) == 0x70) {
     57			model = PC87306;
     58			break;
     59		} else if ((val & 0xf8) == 0x50) {
     60			model = PC87334;
     61			break;
     62		} else if ((val & 0xf8) == 0x40) {
     63			model = PC87303;
     64			break;
     65		}
     66
     67		release_region(base, 2);
     68	}
     69
     70	return (base == 0) ? -1 : 1;
     71}
     72
     73void __init pc873xx_enable_epp19(void)
     74{
     75	unsigned char data;
     76
     77	printk(KERN_INFO "PC873xx enabling EPP v1.9\n");
     78	data = pc873xx_read(base, REG_PCR);
     79	pc873xx_write(base, REG_PCR, (data & 0xFC) | 0x02);
     80}
     81
     82void __init pc873xx_enable_ide(void)
     83{
     84	unsigned char data;
     85
     86	printk(KERN_INFO "PC873xx enabling IDE interrupt\n");
     87	data = pc873xx_read(base, REG_FER);
     88	pc873xx_write(base, REG_FER, data | 0x40);
     89}