02407baaeb
The early vt220 sclp printk code added an extra new line to each printed multi-line text. If used for the early sclp console this will lead to numerous extra new lines. Therefore get rid of this semantic and require that each to be printed string contains a line feed character if a new line is wanted. Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
128 lines
3 KiB
C
128 lines
3 KiB
C
/*
|
|
* Copyright IBM Corp. 2016
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/facility.h>
|
|
#include <asm/lowcore.h>
|
|
#include <asm/sclp.h>
|
|
#include "entry.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[] __initdata = { FACILITIES_ALS };
|
|
|
|
static void __init 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 __init print_machine_type(void)
|
|
{
|
|
static char mach_str[80] __initdata = "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 __init 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';
|
|
}
|
|
|
|
static void __init print_missing_facilities(void)
|
|
{
|
|
static char als_str[80] __initdata = "Missing facilities: ";
|
|
unsigned long val;
|
|
char val_str[6];
|
|
int i, j, first;
|
|
|
|
first = 1;
|
|
for (i = 0; i < ARRAY_SIZE(als); i++) {
|
|
val = ~S390_lowcore.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);
|
|
sclp_early_printk("See Principles of Operations for facility bits\n");
|
|
}
|
|
|
|
static void __init facility_mismatch(void)
|
|
{
|
|
sclp_early_printk("The Linux kernel requires more recent processor hardware\n");
|
|
print_machine_type();
|
|
print_missing_facilities();
|
|
disabled_wait(0x8badcccc);
|
|
}
|
|
|
|
void __init verify_facilities(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(S390_lowcore.stfle_fac_list); i++)
|
|
S390_lowcore.stfle_fac_list[i] = 0;
|
|
asm volatile(
|
|
" stfl 0(0)\n"
|
|
: "=m" (S390_lowcore.stfl_fac_list));
|
|
S390_lowcore.stfle_fac_list[0] = (u64)S390_lowcore.stfl_fac_list << 32;
|
|
if (S390_lowcore.stfl_fac_list & 0x01000000) {
|
|
register unsigned long reg0 asm("0") = ARRAY_SIZE(als) - 1;
|
|
|
|
asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */
|
|
: "+d" (reg0)
|
|
: "a" (&S390_lowcore.stfle_fac_list)
|
|
: "memory", "cc");
|
|
}
|
|
for (i = 0; i < ARRAY_SIZE(als); i++) {
|
|
if ((S390_lowcore.stfle_fac_list[i] & als[i]) != als[i])
|
|
facility_mismatch();
|
|
}
|
|
}
|