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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uclinux.c (2911B)


      1/****************************************************************************/
      2
      3/*
      4 *	uclinux.c -- generic memory mapped MTD driver for uclinux
      5 *
      6 *	(C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)
      7 *
      8 *      License: GPL
      9 */
     10
     11/****************************************************************************/
     12
     13#include <linux/moduleparam.h>
     14#include <linux/types.h>
     15#include <linux/init.h>
     16#include <linux/kernel.h>
     17#include <linux/fs.h>
     18#include <linux/mm.h>
     19#include <linux/major.h>
     20#include <linux/mtd/mtd.h>
     21#include <linux/mtd/map.h>
     22#include <linux/mtd/partitions.h>
     23#include <asm/io.h>
     24#include <asm/sections.h>
     25
     26/****************************************************************************/
     27
     28#ifdef CONFIG_MTD_ROM
     29#define MAP_NAME "rom"
     30#else
     31#define MAP_NAME "ram"
     32#endif
     33
     34static struct map_info uclinux_ram_map = {
     35	.name = MAP_NAME,
     36	.size = 0,
     37};
     38
     39static unsigned long physaddr = -1;
     40module_param(physaddr, ulong, S_IRUGO);
     41
     42static struct mtd_info *uclinux_ram_mtdinfo;
     43
     44/****************************************************************************/
     45
     46static const struct mtd_partition uclinux_romfs[] = {
     47	{ .name = "ROMfs" }
     48};
     49
     50#define	NUM_PARTITIONS	ARRAY_SIZE(uclinux_romfs)
     51
     52/****************************************************************************/
     53
     54static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
     55	size_t *retlen, void **virt, resource_size_t *phys)
     56{
     57	struct map_info *map = mtd->priv;
     58	*virt = map->virt + from;
     59	if (phys)
     60		*phys = map->phys + from;
     61	*retlen = len;
     62	return(0);
     63}
     64
     65/****************************************************************************/
     66
     67static int __init uclinux_mtd_init(void)
     68{
     69	struct mtd_info *mtd;
     70	struct map_info *mapp;
     71
     72	mapp = &uclinux_ram_map;
     73
     74	if (physaddr == -1)
     75		mapp->phys = (resource_size_t)__bss_stop;
     76	else
     77		mapp->phys = physaddr;
     78
     79	if (!mapp->size)
     80		mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
     81	mapp->bankwidth = 4;
     82
     83	printk("uclinux[mtd]: probe address=0x%x size=0x%x\n",
     84	       	(int) mapp->phys, (int) mapp->size);
     85
     86	/*
     87	 * The filesystem is guaranteed to be in direct mapped memory. It is
     88	 * directly following the kernels own bss region. Following the same
     89	 * mechanism used by architectures setting up traditional initrds we
     90	 * use phys_to_virt to get the virtual address of its start.
     91	 */
     92	mapp->virt = phys_to_virt(mapp->phys);
     93
     94	if (mapp->virt == 0) {
     95		printk("uclinux[mtd]: no virtual mapping?\n");
     96		return(-EIO);
     97	}
     98
     99	simple_map_init(mapp);
    100
    101	mtd = do_map_probe("map_" MAP_NAME, mapp);
    102	if (!mtd) {
    103		printk("uclinux[mtd]: failed to find a mapping?\n");
    104		return(-ENXIO);
    105	}
    106
    107	mtd->owner = THIS_MODULE;
    108	mtd->_point = uclinux_point;
    109	mtd->priv = mapp;
    110
    111	uclinux_ram_mtdinfo = mtd;
    112	mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS);
    113
    114	return(0);
    115}
    116device_initcall(uclinux_mtd_init);
    117
    118/****************************************************************************/