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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memory.c (1047B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
      4 * Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
      5 */
      6#include <linux/memblock.h>
      7#include <linux/init.h>
      8#include <linux/mm.h>
      9#include <linux/pfn.h>
     10#include <linux/proc_fs.h>
     11#include <linux/string.h>
     12#include <linux/swap.h>
     13
     14#include <asm/bootinfo.h>
     15#include <asm/page.h>
     16#include <asm/sections.h>
     17
     18#include <asm/mach-ar7/ar7.h>
     19
     20static int __init memsize(void)
     21{
     22	u32 size = (64 << 20);
     23	u32 *addr = (u32 *)KSEG1ADDR(AR7_SDRAM_BASE + size - 4);
     24	u32 *kernel_end = (u32 *)KSEG1ADDR(CPHYSADDR((u32)&_end));
     25	u32 *tmpaddr = addr;
     26
     27	while (tmpaddr > kernel_end) {
     28		*tmpaddr = (u32)tmpaddr;
     29		size >>= 1;
     30		tmpaddr -= size >> 2;
     31	}
     32
     33	do {
     34		tmpaddr += size >> 2;
     35		if (*tmpaddr != (u32)tmpaddr)
     36			break;
     37		size <<= 1;
     38	} while (size < (64 << 20));
     39
     40	writel((u32)tmpaddr, &addr);
     41
     42	return size;
     43}
     44
     45void __init prom_meminit(void)
     46{
     47	unsigned long pages;
     48
     49	pages = memsize() >> PAGE_SHIFT;
     50	memblock_add(PHYS_OFFSET, pages << PAGE_SHIFT);
     51}