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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treeboot-currituck.c (2855B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Copyright © 2011 Tony Breeds IBM Corporation
      4 *
      5 * Based on earlier code:
      6 *   Copyright (C) Paul Mackerras 1997.
      7 *
      8 *   Matt Porter <mporter@kernel.crashing.org>
      9 *   Copyright 2002-2005 MontaVista Software Inc.
     10 *
     11 *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
     12 *   Copyright (c) 2003, 2004 Zultys Technologies
     13 *
     14 *    Copyright 2007 David Gibson, IBM Corporation.
     15 *    Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
     16 *    Copyright © 2011 David Kleikamp IBM Corporation
     17 */
     18#include <stdarg.h>
     19#include <stddef.h>
     20#include "types.h"
     21#include "elf.h"
     22#include "string.h"
     23#include "stdio.h"
     24#include "page.h"
     25#include "ops.h"
     26#include "reg.h"
     27#include "io.h"
     28#include "dcr.h"
     29#include "4xx.h"
     30#include "44x.h"
     31#include "libfdt.h"
     32
     33BSS_STACK(4096);
     34
     35#define MAX_RANKS	0x4
     36#define DDR3_MR0CF	0x80010011U
     37
     38static unsigned long long ibm_currituck_memsize;
     39static unsigned long long ibm_currituck_detect_memsize(void)
     40{
     41	u32 reg;
     42	unsigned i;
     43	unsigned long long memsize = 0;
     44
     45	for(i = 0; i < MAX_RANKS; i++){
     46		reg = mfdcrx(DDR3_MR0CF + i);
     47
     48		if (!(reg & 1))
     49			continue;
     50
     51		reg &= 0x0000f000;
     52		reg >>= 12;
     53		memsize += (0x800000ULL << reg);
     54	}
     55
     56	return memsize;
     57}
     58
     59static void ibm_currituck_fixups(void)
     60{
     61	void *devp = finddevice("/");
     62	u32 dma_ranges[7];
     63
     64	dt_fixup_memory(0x0ULL,  ibm_currituck_memsize);
     65
     66	while ((devp = find_node_by_devtype(devp, "pci"))) {
     67		if (getprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges)) < 0) {
     68			printf("%s: Failed to get dma-ranges\r\n", __func__);
     69			continue;
     70		}
     71
     72		dma_ranges[5] = ibm_currituck_memsize >> 32;
     73		dma_ranges[6] = ibm_currituck_memsize & 0xffffffffUL;
     74
     75		setprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges));
     76	}
     77}
     78
     79#define SPRN_PIR	0x11E	/* Processor Identification Register */
     80void platform_init(void)
     81{
     82	unsigned long end_of_ram, avail_ram;
     83	u32 pir_reg;
     84	int node, size;
     85	const u32 *timebase;
     86
     87	ibm_currituck_memsize = ibm_currituck_detect_memsize();
     88	if (ibm_currituck_memsize >> 32)
     89		end_of_ram = ~0UL;
     90	else
     91		end_of_ram = ibm_currituck_memsize;
     92	avail_ram = end_of_ram - (unsigned long)_end;
     93
     94	simple_alloc_init(_end, avail_ram, 128, 64);
     95	platform_ops.fixups = ibm_currituck_fixups;
     96	platform_ops.exit = ibm44x_dbcr_reset;
     97	pir_reg = mfspr(SPRN_PIR);
     98
     99	/* Make sure FDT blob is sane */
    100	if (fdt_check_header(_dtb_start) != 0)
    101		fatal("Invalid device tree blob\n");
    102
    103	node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
    104	                                     "cpu", sizeof("cpu"));
    105	if (!node)
    106		fatal("Cannot find cpu node\n");
    107	timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
    108	if (timebase && (size == 4))
    109		timebase_period_ns = 1000000000 / *timebase;
    110
    111	fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
    112	fdt_init(_dtb_start);
    113
    114	serial_console_init();
    115}