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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bats.c (2765B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Copyright 2018, Christophe Leroy CS S.I.
      4 * <christophe.leroy@c-s.fr>
      5 *
      6 * This dumps the content of BATS
      7 */
      8
      9#include <linux/pgtable.h>
     10#include <linux/debugfs.h>
     11#include <asm/cpu_has_feature.h>
     12
     13#include "ptdump.h"
     14
     15static void bat_show_603(struct seq_file *m, int idx, u32 lower, u32 upper, bool is_d)
     16{
     17	u32 bepi = upper & 0xfffe0000;
     18	u32 bl = (upper >> 2) & 0x7ff;
     19	u32 k = upper & 3;
     20	phys_addr_t brpn = PHYS_BAT_ADDR(lower);
     21	u32 size = (bl + 1) << 17;
     22
     23	seq_printf(m, "%d: ", idx);
     24	if (k == 0) {
     25		seq_puts(m, "        -\n");
     26		return;
     27	}
     28
     29	seq_printf(m, "0x%08x-0x%08x ", bepi, bepi + size - 1);
     30#ifdef CONFIG_PHYS_64BIT
     31	seq_printf(m, "0x%016llx ", brpn);
     32#else
     33	seq_printf(m, "0x%08x ", brpn);
     34#endif
     35	pt_dump_size(m, size);
     36
     37	if (k == 1)
     38		seq_puts(m, "User ");
     39	else if (k == 2)
     40		seq_puts(m, "Kernel ");
     41	else
     42		seq_puts(m, "Kernel/User ");
     43
     44	if (lower & BPP_RX)
     45		seq_puts(m, is_d ? "r   " : "  x ");
     46	else if (lower & BPP_RW)
     47		seq_puts(m, is_d ? "rw  " : "  x ");
     48	else
     49		seq_puts(m, is_d ? "    " : "    ");
     50
     51	seq_puts(m, lower & _PAGE_WRITETHRU ? "w " : "  ");
     52	seq_puts(m, lower & _PAGE_NO_CACHE ? "i " : "  ");
     53	seq_puts(m, lower & _PAGE_COHERENT ? "m " : "  ");
     54	seq_puts(m, lower & _PAGE_GUARDED ? "g " : "  ");
     55	seq_puts(m, "\n");
     56}
     57
     58#define BAT_SHOW_603(_m, _n, _l, _u, _d) bat_show_603(_m, _n, mfspr(_l), mfspr(_u), _d)
     59
     60static int bats_show(struct seq_file *m, void *v)
     61{
     62	seq_puts(m, "---[ Instruction Block Address Translation ]---\n");
     63
     64	BAT_SHOW_603(m, 0, SPRN_IBAT0L, SPRN_IBAT0U, false);
     65	BAT_SHOW_603(m, 1, SPRN_IBAT1L, SPRN_IBAT1U, false);
     66	BAT_SHOW_603(m, 2, SPRN_IBAT2L, SPRN_IBAT2U, false);
     67	BAT_SHOW_603(m, 3, SPRN_IBAT3L, SPRN_IBAT3U, false);
     68	if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {
     69		BAT_SHOW_603(m, 4, SPRN_IBAT4L, SPRN_IBAT4U, false);
     70		BAT_SHOW_603(m, 5, SPRN_IBAT5L, SPRN_IBAT5U, false);
     71		BAT_SHOW_603(m, 6, SPRN_IBAT6L, SPRN_IBAT6U, false);
     72		BAT_SHOW_603(m, 7, SPRN_IBAT7L, SPRN_IBAT7U, false);
     73	}
     74
     75	seq_puts(m, "\n---[ Data Block Address Translation ]---\n");
     76
     77	BAT_SHOW_603(m, 0, SPRN_DBAT0L, SPRN_DBAT0U, true);
     78	BAT_SHOW_603(m, 1, SPRN_DBAT1L, SPRN_DBAT1U, true);
     79	BAT_SHOW_603(m, 2, SPRN_DBAT2L, SPRN_DBAT2U, true);
     80	BAT_SHOW_603(m, 3, SPRN_DBAT3L, SPRN_DBAT3U, true);
     81	if (mmu_has_feature(MMU_FTR_USE_HIGH_BATS)) {
     82		BAT_SHOW_603(m, 4, SPRN_DBAT4L, SPRN_DBAT4U, true);
     83		BAT_SHOW_603(m, 5, SPRN_DBAT5L, SPRN_DBAT5U, true);
     84		BAT_SHOW_603(m, 6, SPRN_DBAT6L, SPRN_DBAT6U, true);
     85		BAT_SHOW_603(m, 7, SPRN_DBAT7L, SPRN_DBAT7U, true);
     86	}
     87
     88	return 0;
     89}
     90
     91DEFINE_SHOW_ATTRIBUTE(bats);
     92
     93static int __init bats_init(void)
     94{
     95	debugfs_create_file("block_address_translation", 0400,
     96			    arch_debugfs_dir, NULL, &bats_fops);
     97	return 0;
     98}
     99device_initcall(bats_init);