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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lowlevel.c (1736B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * IBM ASM Service Processor Device Driver
      4 *
      5 * Copyright (C) IBM Corporation, 2004
      6 *
      7 * Author: Max Asböck <amax@us.ibm.com>
      8 */
      9
     10#include "ibmasm.h"
     11#include "lowlevel.h"
     12#include "i2o.h"
     13#include "dot_command.h"
     14#include "remote.h"
     15
     16static struct i2o_header header = I2O_HEADER_TEMPLATE;
     17
     18
     19int ibmasm_send_i2o_message(struct service_processor *sp)
     20{
     21	u32 mfa;
     22	unsigned int command_size;
     23	struct i2o_message *message;
     24	struct command *command = sp->current_command;
     25
     26	mfa = get_mfa_inbound(sp->base_address);
     27	if (!mfa)
     28		return 1;
     29
     30	command_size = get_dot_command_size(command->buffer);
     31	header.message_size = outgoing_message_size(command_size);
     32
     33	message = get_i2o_message(sp->base_address, mfa);
     34
     35	memcpy_toio(&message->header, &header, sizeof(struct i2o_header));
     36	memcpy_toio(&message->data, command->buffer, command_size);
     37
     38	set_mfa_inbound(sp->base_address, mfa);
     39
     40	return 0;
     41}
     42
     43irqreturn_t ibmasm_interrupt_handler(int irq, void * dev_id)
     44{
     45	u32	mfa;
     46	struct service_processor *sp = (struct service_processor *)dev_id;
     47	void __iomem *base_address = sp->base_address;
     48	char tsbuf[32];
     49
     50	if (!sp_interrupt_pending(base_address))
     51		return IRQ_NONE;
     52
     53	dbg("respond to interrupt at %s\n", get_timestamp(tsbuf));
     54
     55	if (mouse_interrupt_pending(sp)) {
     56		ibmasm_handle_mouse_interrupt(sp);
     57		clear_mouse_interrupt(sp);
     58	}
     59
     60	mfa = get_mfa_outbound(base_address);
     61	if (valid_mfa(mfa)) {
     62		struct i2o_message *msg = get_i2o_message(base_address, mfa);
     63		ibmasm_receive_message(sp, &msg->data, incoming_data_size(msg));
     64	} else
     65		dbg("didn't get a valid MFA\n");
     66
     67	set_mfa_outbound(base_address, mfa);
     68	dbg("finished interrupt at   %s\n", get_timestamp(tsbuf));
     69
     70	return IRQ_HANDLED;
     71}