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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p1275.c (1177B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * p1275.c: Sun IEEE 1275 PROM low level interface routines
      4 *
      5 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
      6 */
      7
      8#include <linux/kernel.h>
      9#include <linux/sched.h>
     10#include <linux/smp.h>
     11#include <linux/string.h>
     12#include <linux/spinlock.h>
     13#include <linux/irqflags.h>
     14
     15#include <asm/openprom.h>
     16#include <asm/oplib.h>
     17#include <asm/spitfire.h>
     18#include <asm/pstate.h>
     19#include <asm/ldc.h>
     20
     21struct {
     22	long prom_callback;			/* 0x00 */
     23	void (*prom_cif_handler)(long *);	/* 0x08 */
     24} p1275buf;
     25
     26extern void prom_world(int);
     27
     28extern void prom_cif_direct(unsigned long *args);
     29extern void prom_cif_callback(void);
     30
     31/*
     32 * This provides SMP safety on the p1275buf.
     33 */
     34DEFINE_RAW_SPINLOCK(prom_entry_lock);
     35
     36void p1275_cmd_direct(unsigned long *args)
     37{
     38	unsigned long flags;
     39
     40	local_save_flags(flags);
     41	local_irq_restore((unsigned long)PIL_NMI);
     42	raw_spin_lock(&prom_entry_lock);
     43
     44	prom_world(1);
     45	prom_cif_direct(args);
     46	prom_world(0);
     47
     48	raw_spin_unlock(&prom_entry_lock);
     49	local_irq_restore(flags);
     50}
     51
     52void prom_cif_init(void *cif_handler, void *cif_stack)
     53{
     54	p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
     55}