cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

treeboot-akebono.c (3905B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Copyright © 2013 Tony Breeds IBM Corporation
      4 * Copyright © 2013 Alistair Popple IBM Corporation
      5 *
      6 * Based on earlier code:
      7 *   Copyright (C) Paul Mackerras 1997.
      8 *
      9 *   Matt Porter <mporter@kernel.crashing.org>
     10 *   Copyright 2002-2005 MontaVista Software Inc.
     11 *
     12 *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
     13 *   Copyright (c) 2003, 2004 Zultys Technologies
     14 *
     15 *    Copyright 2007 David Gibson, IBM Corporation.
     16 *    Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
     17 *    Copyright © 2011 David Kleikamp IBM Corporation
     18 */
     19#include <stdarg.h>
     20#include <stddef.h>
     21#include "types.h"
     22#include "elf.h"
     23#include "string.h"
     24#include "stdlib.h"
     25#include "stdio.h"
     26#include "page.h"
     27#include "ops.h"
     28#include "reg.h"
     29#include "io.h"
     30#include "dcr.h"
     31#include "4xx.h"
     32#include "44x.h"
     33#include "libfdt.h"
     34
     35BSS_STACK(4096);
     36
     37#define SPRN_PIR	0x11E	/* Processor Identification Register */
     38#define USERDATA_LEN	256	/* Length of userdata passed in by PIBS */
     39#define MAX_RANKS	0x4
     40#define DDR3_MR0CF	0x80010011U
     41#define CCTL0_MCO2	0x8000080FU
     42#define CCTL0_MCO3	0x80000810U
     43#define CCTL0_MCO4	0x80000811U
     44#define CCTL0_MCO5	0x80000812U
     45#define CCTL0_MCO6	0x80000813U
     46
     47static unsigned long long ibm_akebono_memsize;
     48static long long unsigned mac_addr;
     49
     50static unsigned long long ibm_akebono_detect_memsize(void)
     51{
     52	u32 reg;
     53	unsigned i;
     54	unsigned long long memsize = 0;
     55
     56	for (i = 0; i < MAX_RANKS; i++) {
     57		reg = mfdcrx(DDR3_MR0CF + i);
     58
     59		if (!(reg & 1))
     60			continue;
     61
     62		reg &= 0x0000f000;
     63		reg >>= 12;
     64		memsize += (0x800000ULL << reg);
     65	}
     66
     67	return memsize;
     68}
     69
     70static void ibm_akebono_fixups(void)
     71{
     72	void *emac;
     73	u32 reg;
     74
     75	dt_fixup_memory(0x0ULL,  ibm_akebono_memsize);
     76
     77	/* Fixup the SD timeout frequency */
     78	mtdcrx(CCTL0_MCO4, 0x1);
     79
     80	/* Disable SD high-speed mode (which seems to be broken) */
     81	reg = mfdcrx(CCTL0_MCO2) & ~0x2;
     82	mtdcrx(CCTL0_MCO2, reg);
     83
     84	/* Set the MAC address */
     85	emac = finddevice("/plb/opb/ethernet");
     86	if (emac > 0) {
     87		if (mac_addr)
     88			setprop(emac, "local-mac-address",
     89				((u8 *) &mac_addr) + 2 , 6);
     90	}
     91}
     92
     93void platform_init(char *userdata)
     94{
     95	unsigned long end_of_ram, avail_ram;
     96	u32 pir_reg;
     97	int node, size;
     98	const u32 *timebase;
     99	int len, i, userdata_len;
    100	char *end;
    101
    102	userdata[USERDATA_LEN - 1] = '\0';
    103	userdata_len = strlen(userdata);
    104	for (i = 0; i < userdata_len - 15; i++) {
    105		if (strncmp(&userdata[i], "local-mac-addr=", 15) == 0) {
    106			if (i > 0 && userdata[i - 1] != ' ') {
    107				/* We've only found a substring ending
    108				 * with local-mac-addr so this isn't
    109				 * our mac address. */
    110				continue;
    111			}
    112
    113			mac_addr = strtoull(&userdata[i + 15], &end, 16);
    114
    115			/* Remove the "local-mac-addr=<...>" from the kernel
    116			 * command line, including the tailing space if
    117			 * present. */
    118			if (*end == ' ')
    119				end++;
    120
    121			len = ((int) end) - ((int) &userdata[i]);
    122			memmove(&userdata[i], end,
    123				userdata_len - (len + i) + 1);
    124			break;
    125		}
    126	}
    127
    128	loader_info.cmdline = userdata;
    129	loader_info.cmdline_len = 256;
    130
    131	ibm_akebono_memsize = ibm_akebono_detect_memsize();
    132	if (ibm_akebono_memsize >> 32)
    133		end_of_ram = ~0UL;
    134	else
    135		end_of_ram = ibm_akebono_memsize;
    136	avail_ram = end_of_ram - (unsigned long)_end;
    137
    138	simple_alloc_init(_end, avail_ram, 128, 64);
    139	platform_ops.fixups = ibm_akebono_fixups;
    140	platform_ops.exit = ibm44x_dbcr_reset;
    141	pir_reg = mfspr(SPRN_PIR);
    142
    143	/* Make sure FDT blob is sane */
    144	if (fdt_check_header(_dtb_start) != 0)
    145		fatal("Invalid device tree blob\n");
    146
    147	node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
    148					     "cpu", sizeof("cpu"));
    149	if (!node)
    150		fatal("Cannot find cpu node\n");
    151	timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
    152	if (timebase && (size == 4))
    153		timebase_period_ns = 1000000000 / *timebase;
    154
    155	fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
    156	fdt_init(_dtb_start);
    157
    158	serial_console_init();
    159}