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/*
* 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 };
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])
continue;
_sclp_print_early("The Linux kernel requires more recent processor hardware");
disabled_wait(0x8badcccc);
}
}
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