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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mem.c (845B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 */
      4#include <linux/fs.h>
      5#include <linux/fcntl.h>
      6#include <linux/memblock.h>
      7#include <linux/mm.h>
      8
      9#include <asm/bootinfo.h>
     10
     11#include <loongson.h>
     12#include <mem.h>
     13#include <pci.h>
     14
     15
     16u32 memsize, highmemsize;
     17
     18void __init prom_init_memory(void)
     19{
     20	memblock_add(0x0, (memsize << 20));
     21
     22#ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
     23	{
     24		int bit;
     25
     26		bit = fls(memsize + highmemsize);
     27		if (bit != ffs(memsize + highmemsize))
     28			bit += 20;
     29		else
     30			bit = bit + 20 - 1;
     31
     32		/* set cpu window3 to map CPU to DDR: 2G -> 2G */
     33		LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
     34					  0x80000000ul, (1 << bit));
     35		mmiowb();
     36	}
     37#endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
     38
     39#ifdef CONFIG_64BIT
     40	if (highmemsize > 0)
     41		memblock_add(LOONGSON_HIGHMEM_START, highmemsize << 20);
     42#endif /* !CONFIG_64BIT */
     43}