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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env.c (2680B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Author: Huacai Chen <chenhuacai@loongson.cn>
      4 *
      5 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
      6 */
      7#include <linux/acpi.h>
      8#include <linux/efi.h>
      9#include <linux/export.h>
     10#include <linux/memblock.h>
     11#include <linux/of_fdt.h>
     12#include <asm/early_ioremap.h>
     13#include <asm/bootinfo.h>
     14#include <asm/loongson.h>
     15
     16u64 efi_system_table;
     17struct loongson_system_configuration loongson_sysconf;
     18EXPORT_SYMBOL(loongson_sysconf);
     19
     20u64 loongson_chipcfg[MAX_PACKAGES];
     21u64 loongson_chiptemp[MAX_PACKAGES];
     22u64 loongson_freqctrl[MAX_PACKAGES];
     23unsigned long long smp_group[MAX_PACKAGES];
     24
     25static void __init register_addrs_set(u64 *registers, const u64 addr, int num)
     26{
     27	u64 i;
     28
     29	for (i = 0; i < num; i++) {
     30		*registers = (i << 44) | addr;
     31		registers++;
     32	}
     33}
     34
     35void __init init_environ(void)
     36{
     37	int efi_boot = fw_arg0;
     38	struct efi_memory_map_data data;
     39	void *fdt_ptr = early_memremap_ro(fw_arg1, SZ_64K);
     40
     41	if (efi_boot)
     42		set_bit(EFI_BOOT, &efi.flags);
     43	else
     44		clear_bit(EFI_BOOT, &efi.flags);
     45
     46	early_init_dt_scan(fdt_ptr);
     47	early_init_fdt_reserve_self();
     48	efi_system_table = efi_get_fdt_params(&data);
     49
     50	efi_memmap_init_early(&data);
     51	memblock_reserve(data.phys_map & PAGE_MASK,
     52			 PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK)));
     53
     54	register_addrs_set(smp_group, TO_UNCACHE(0x1fe01000), 16);
     55	register_addrs_set(loongson_chipcfg, TO_UNCACHE(0x1fe00180), 16);
     56	register_addrs_set(loongson_chiptemp, TO_UNCACHE(0x1fe0019c), 16);
     57	register_addrs_set(loongson_freqctrl, TO_UNCACHE(0x1fe001d0), 16);
     58}
     59
     60static int __init init_cpu_fullname(void)
     61{
     62	int cpu;
     63
     64	if (loongson_sysconf.cpuname && !strncmp(loongson_sysconf.cpuname, "Loongson", 8)) {
     65		for (cpu = 0; cpu < NR_CPUS; cpu++)
     66			__cpu_full_name[cpu] = loongson_sysconf.cpuname;
     67	}
     68	return 0;
     69}
     70arch_initcall(init_cpu_fullname);
     71
     72static ssize_t boardinfo_show(struct kobject *kobj,
     73			      struct kobj_attribute *attr, char *buf)
     74{
     75	return sprintf(buf,
     76		"BIOS Information\n"
     77		"Vendor\t\t\t: %s\n"
     78		"Version\t\t\t: %s\n"
     79		"ROM Size\t\t: %d KB\n"
     80		"Release Date\t\t: %s\n\n"
     81		"Board Information\n"
     82		"Manufacturer\t\t: %s\n"
     83		"Board Name\t\t: %s\n"
     84		"Family\t\t\t: LOONGSON64\n\n",
     85		b_info.bios_vendor, b_info.bios_version,
     86		b_info.bios_size, b_info.bios_release_date,
     87		b_info.board_vendor, b_info.board_name);
     88}
     89
     90static struct kobj_attribute boardinfo_attr = __ATTR(boardinfo, 0444,
     91						     boardinfo_show, NULL);
     92
     93static int __init boardinfo_init(void)
     94{
     95	struct kobject *loongson_kobj;
     96
     97	loongson_kobj = kobject_create_and_add("loongson", firmware_kobj);
     98
     99	return sysfs_create_file(loongson_kobj, &boardinfo_attr.attr);
    100}
    101late_initcall(boardinfo_init);