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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prom.c (2800B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  RouterBoard 500 specific prom routines
      4 *
      5 *  Copyright (C) 2003, Peter Sadik <peter.sadik@idt.com>
      6 *  Copyright (C) 2005-2006, P.Christeas <p_christ@hol.gr>
      7 *  Copyright (C) 2007, Gabor Juhos <juhosg@openwrt.org>
      8 *			Felix Fietkau <nbd@openwrt.org>
      9 *			Florian Fainelli <florian@openwrt.org>
     10 */
     11
     12#include <linux/init.h>
     13#include <linux/mm.h>
     14#include <linux/export.h>
     15#include <linux/string.h>
     16#include <linux/console.h>
     17#include <linux/memblock.h>
     18#include <linux/ioport.h>
     19
     20#include <asm/bootinfo.h>
     21#include <asm/mach-rc32434/ddr.h>
     22#include <asm/mach-rc32434/prom.h>
     23
     24unsigned int idt_cpu_freq = 132000000;
     25EXPORT_SYMBOL(idt_cpu_freq);
     26
     27static struct resource ddr_reg[] = {
     28	{
     29		.name = "ddr-reg",
     30		.start = DDR0_PHYS_ADDR,
     31		.end = DDR0_PHYS_ADDR + sizeof(struct ddr_ram),
     32		.flags = IORESOURCE_MEM,
     33	}
     34};
     35
     36static inline int match_tag(char *arg, const char *tag)
     37{
     38	return strncmp(arg, tag, strlen(tag)) == 0;
     39}
     40
     41static inline unsigned long tag2ul(char *arg, const char *tag)
     42{
     43	char *num;
     44
     45	num = arg + strlen(tag);
     46	return simple_strtoul(num, 0, 10);
     47}
     48
     49void __init prom_setup_cmdline(void)
     50{
     51	static char cmd_line[COMMAND_LINE_SIZE] __initdata;
     52	char *cp, *board;
     53	int prom_argc;
     54	char **prom_argv;
     55	int i;
     56
     57	prom_argc = fw_arg0;
     58	prom_argv = (char **) fw_arg1;
     59
     60	cp = cmd_line;
     61		/* Note: it is common that parameters start
     62		 * at argv[1] and not argv[0],
     63		 * however, our elf loader starts at [0] */
     64	for (i = 0; i < prom_argc; i++) {
     65		if (match_tag(prom_argv[i], FREQ_TAG)) {
     66			idt_cpu_freq = tag2ul(prom_argv[i], FREQ_TAG);
     67			continue;
     68		}
     69#ifdef IGNORE_CMDLINE_MEM
     70		/* parses out the "mem=xx" arg */
     71		if (match_tag(prom_argv[i], MEM_TAG))
     72			continue;
     73#endif
     74		if (i > 0)
     75			*(cp++) = ' ';
     76		if (match_tag(prom_argv[i], BOARD_TAG)) {
     77			board = prom_argv[i] + strlen(BOARD_TAG);
     78
     79			if (match_tag(board, BOARD_RB532A))
     80				mips_machtype = MACH_MIKROTIK_RB532A;
     81			else
     82				mips_machtype = MACH_MIKROTIK_RB532;
     83		}
     84
     85		strcpy(cp, prom_argv[i]);
     86		cp += strlen(prom_argv[i]);
     87	}
     88	*(cp++) = ' ';
     89
     90	i = strlen(arcs_cmdline);
     91	if (i > 0) {
     92		*(cp++) = ' ';
     93		strcpy(cp, arcs_cmdline);
     94		cp += strlen(arcs_cmdline);
     95	}
     96	cmd_line[COMMAND_LINE_SIZE - 1] = '\0';
     97
     98	strcpy(arcs_cmdline, cmd_line);
     99}
    100
    101void __init prom_init(void)
    102{
    103	struct ddr_ram __iomem *ddr;
    104	phys_addr_t memsize;
    105	phys_addr_t ddrbase;
    106
    107	ddr = ioremap(ddr_reg[0].start,
    108			ddr_reg[0].end - ddr_reg[0].start);
    109
    110	if (!ddr) {
    111		printk(KERN_ERR "Unable to remap DDR register\n");
    112		return;
    113	}
    114
    115	ddrbase = (phys_addr_t)&ddr->ddrbase;
    116	memsize = (phys_addr_t)&ddr->ddrmask;
    117	memsize = 0 - memsize;
    118
    119	prom_setup_cmdline();
    120
    121	/* give all RAM to boot allocator,
    122	 * except for the first 0x400 and the last 0x200 bytes */
    123	memblock_add(ddrbase + 0x400, memsize - 0x600);
    124}