115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
|
// 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"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The code within this file will be called very early. It may _not_
|
||
|
|
* access anything within the bss section, since that is not cleared
|
||
|
|
* yet and may contain data (e.g. initrd) that must be saved by other
|
||
|
|
* code.
|
||
|
|
* For temporary objects the stack (16k) should be used.
|
||
|
|
*/
|
||
|
|
|
||
|
|
static unsigned long als[] = { FACILITIES_ALS };
|
||
|
|
|
||
|
|
static void u16_to_hex(char *str, u16 val)
|
||
|
|
{
|
||
|
|
int i, num;
|
||
|
|
|
||
|
|
for (i = 1; i <= 4; i++) {
|
||
|
|
num = (val >> (16 - 4 * i)) & 0xf;
|
||
|
|
if (num >= 10)
|
||
|
|
num += 7;
|
||
|
|
*str++ = '0' + num;
|
||
|
|
}
|
||
|
|
*str = '\0';
|
||
|
|
}
|
||
|
|
|
||
|
|
static void print_machine_type(void)
|
||
|
|
{
|
||
|
|
static char mach_str[80] = "Detected machine-type number: ";
|
||
|
|
char type_str[5];
|
||
|
|
struct cpuid id;
|
||
|
|
|
||
|
|
get_cpu_id(&id);
|
||
|
|
u16_to_hex(type_str, id.machine);
|
||
|
|
strcat(mach_str, type_str);
|
||
|
|
strcat(mach_str, "\n");
|
||
|
|
sclp_early_printk(mach_str);
|
||
|
|
}
|
||
|
|
|
||
|
|
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) {
|
||
|
|
strcat(als_str, "\n");
|
||
|
|
sclp_early_printk(als_str);
|
||
|
|
*als_str = '\0';
|
||
|
|
}
|
||
|
|
u16_to_decimal(val_str, i * BITS_PER_LONG + j);
|
||
|
|
strcat(als_str, val_str);
|
||
|
|
first = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
strcat(als_str, "\n");
|
||
|
|
sclp_early_printk(als_str);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void facility_mismatch(void)
|
||
|
|
{
|
||
|
|
sclp_early_printk("The Linux kernel requires more recent processor hardware\n");
|
||
|
|
print_machine_type();
|
||
|
|
print_missing_facilities();
|
||
|
|
sclp_early_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();
|
||
|
|
}
|
||
|
|
}
|