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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2016
*/
#include <linux/kernel.h>
#include <asm/processor.h>
#include <asm/facility.h>
#include <asm/lowcore.h>
#include <asm/sclp.h>
#include "boot.h"
static unsigned long als[] = { FACILITIES_ALS };
static void u16_to_decimal(char *str, u16 val)
{
int div = 1;
while (div * 10 <= val)
div *= 10;
while (div) {
*str++ = '0' + val / div;
val %= div;
div /= 10;
}
*str = '\0';
}
void print_missing_facilities(void)
{
static char als_str[80] = "Missing facilities: ";
unsigned long val;
char val_str[6];
int i, j, first;
first = 1;
for (i = 0; i < ARRAY_SIZE(als); i++) {
val = ~stfle_fac_list[i] & als[i];
for (j = 0; j < BITS_PER_LONG; j++) {
if (!(val & (1UL << (BITS_PER_LONG - 1 - j))))
continue;
if (!first)
strcat(als_str, ",");
/*
* Make sure we stay within one line. Consider that
* each facility bit adds up to five characters and
* z/VM adds a four character prefix.
*/
if (strlen(als_str) > 70) {
boot_printk("%s\n", als_str);
*als_str = '\0';
}
u16_to_decimal(val_str, i * BITS_PER_LONG + j);
strcat(als_str, val_str);
first = 0;
}
}
boot_printk("%s\n", als_str);
}
static void facility_mismatch(void)
{
struct cpuid id;
get_cpu_id(&id);
boot_printk("The Linux kernel requires more recent processor hardware\n");
boot_printk("Detected machine-type number: %4x\n", id.machine);
print_missing_facilities();
boot_printk("See Principles of Operations for facility bits\n");
disabled_wait();
}
void verify_facilities(void)
{
int i;
__stfle(stfle_fac_list, ARRAY_SIZE(stfle_fac_list));
for (i = 0; i < ARRAY_SIZE(als); i++) {
if ((stfle_fac_list[i] & als[i]) != als[i])
facility_mismatch();
}
}
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