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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setup.c (3118B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Arch related setup for Hexagon
      4 *
      5 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
      6 */
      7
      8#include <linux/init.h>
      9#include <linux/delay.h>
     10#include <linux/memblock.h>
     11#include <linux/mmzone.h>
     12#include <linux/mm.h>
     13#include <linux/seq_file.h>
     14#include <linux/console.h>
     15#include <linux/of_fdt.h>
     16#include <asm/io.h>
     17#include <asm/sections.h>
     18#include <asm/setup.h>
     19#include <asm/processor.h>
     20#include <asm/hexagon_vm.h>
     21#include <asm/vm_mmu.h>
     22#include <asm/time.h>
     23
     24char cmd_line[COMMAND_LINE_SIZE];
     25static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
     26
     27int on_simulator;
     28
     29void calibrate_delay(void)
     30{
     31	loops_per_jiffy = thread_freq_mhz * 1000000 / HZ;
     32}
     33
     34/*
     35 * setup_arch -  high level architectural setup routine
     36 * @cmdline_p: pointer to pointer to command-line arguments
     37 */
     38
     39void __init setup_arch(char **cmdline_p)
     40{
     41	char *p = &external_cmdline_buffer;
     42
     43	/*
     44	 * These will eventually be pulled in via either some hypervisor
     45	 * or devicetree description.  Hardwiring for now.
     46	 */
     47	pcycle_freq_mhz = 600;
     48	thread_freq_mhz = 100;
     49	sleep_clk_freq = 32000;
     50
     51	/*
     52	 * Set up event bindings to handle exceptions and interrupts.
     53	 */
     54	__vmsetvec(_K_VM_event_vector);
     55
     56	printk(KERN_INFO "PHYS_OFFSET=0x%08lx\n", PHYS_OFFSET);
     57
     58	/*
     59	 * Simulator has a few differences from the hardware.
     60	 * For now, check uninitialized-but-mapped memory
     61	 * prior to invoking setup_arch_memory().
     62	 */
     63	if (*(int *)((unsigned long)_end + 8) == 0x1f1f1f1f)
     64		on_simulator = 1;
     65	else
     66		on_simulator = 0;
     67
     68	if (p[0] != '\0')
     69		strlcpy(boot_command_line, p, COMMAND_LINE_SIZE);
     70	else
     71		strlcpy(boot_command_line, default_command_line,
     72			COMMAND_LINE_SIZE);
     73
     74	/*
     75	 * boot_command_line and the value set up by setup_arch
     76	 * are both picked up by the init code. If no reason to
     77	 * make them different, pass the same pointer back.
     78	 */
     79	strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
     80	*cmdline_p = cmd_line;
     81
     82	parse_early_param();
     83
     84	setup_arch_memory();
     85
     86#ifdef CONFIG_SMP
     87	smp_start_cpus();
     88#endif
     89}
     90
     91/*
     92 * Functions for dumping CPU info via /proc
     93 * Probably should move to kernel/proc.c or something.
     94 */
     95static void *c_start(struct seq_file *m, loff_t *pos)
     96{
     97	return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
     98}
     99
    100static void *c_next(struct seq_file *m, void *v, loff_t *pos)
    101{
    102	++*pos;
    103	return c_start(m, pos);
    104}
    105
    106static void c_stop(struct seq_file *m, void *v)
    107{
    108}
    109
    110/*
    111 * Eventually this will dump information about
    112 * CPU properties like ISA level, TLB size, etc.
    113 */
    114static int show_cpuinfo(struct seq_file *m, void *v)
    115{
    116	int cpu = (unsigned long) v - 1;
    117
    118#ifdef CONFIG_SMP
    119	if (!cpu_online(cpu))
    120		return 0;
    121#endif
    122
    123	seq_printf(m, "processor\t: %d\n", cpu);
    124	seq_printf(m, "model name\t: Hexagon Virtual Machine\n");
    125	seq_printf(m, "BogoMips\t: %lu.%02lu\n",
    126		(loops_per_jiffy * HZ) / 500000,
    127		((loops_per_jiffy * HZ) / 5000) % 100);
    128	seq_printf(m, "\n");
    129	return 0;
    130}
    131
    132const struct seq_operations cpuinfo_op = {
    133	.start  = &c_start,
    134	.next   = &c_next,
    135	.stop   = &c_stop,
    136	.show   = &show_cpuinfo,
    137};