926 lines
23 KiB
C
926 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* This only handles 32bit MTRR on 32bit hosts. This is strictly wrong
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* because MTRRs can span up to 40 bits (36bits on most modern x86)
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*/
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#define DEBUG
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <asm/processor-flags.h>
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#include <asm/cpufeature.h>
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#include <asm/tlbflush.h>
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#include <asm/mtrr.h>
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#include <asm/msr.h>
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#include <asm/pat.h>
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#include "mtrr.h"
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struct fixed_range_block {
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int base_msr; /* start address of an MTRR block */
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int ranges; /* number of MTRRs in this block */
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};
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static struct fixed_range_block fixed_range_blocks[] = {
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{ MSR_MTRRfix64K_00000, 1 }, /* one 64k MTRR */
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{ MSR_MTRRfix16K_80000, 2 }, /* two 16k MTRRs */
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{ MSR_MTRRfix4K_C0000, 8 }, /* eight 4k MTRRs */
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{}
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};
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static unsigned long smp_changes_mask;
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static int mtrr_state_set;
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u64 mtrr_tom2;
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struct mtrr_state_type mtrr_state;
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EXPORT_SYMBOL_GPL(mtrr_state);
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/*
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* BIOS is expected to clear MtrrFixDramModEn bit, see for example
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* "BIOS and Kernel Developer's Guide for the AMD Athlon 64 and AMD
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* Opteron Processors" (26094 Rev. 3.30 February 2006), section
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* "13.2.1.2 SYSCFG Register": "The MtrrFixDramModEn bit should be set
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* to 1 during BIOS initialization of the fixed MTRRs, then cleared to
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* 0 for operation."
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*/
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static inline void k8_check_syscfg_dram_mod_en(void)
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{
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u32 lo, hi;
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if (!((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
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(boot_cpu_data.x86 >= 0x0f)))
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return;
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rdmsr(MSR_K8_SYSCFG, lo, hi);
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if (lo & K8_MTRRFIXRANGE_DRAM_MODIFY) {
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pr_err(FW_WARN "MTRR: CPU %u: SYSCFG[MtrrFixDramModEn]"
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" not cleared by BIOS, clearing this bit\n",
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smp_processor_id());
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lo &= ~K8_MTRRFIXRANGE_DRAM_MODIFY;
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mtrr_wrmsr(MSR_K8_SYSCFG, lo, hi);
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}
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}
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/* Get the size of contiguous MTRR range */
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static u64 get_mtrr_size(u64 mask)
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{
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u64 size;
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mask >>= PAGE_SHIFT;
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mask |= size_or_mask;
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size = -mask;
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size <<= PAGE_SHIFT;
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return size;
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}
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/*
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* Check and return the effective type for MTRR-MTRR type overlap.
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* Returns 1 if the effective type is UNCACHEABLE, else returns 0
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*/
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static int check_type_overlap(u8 *prev, u8 *curr)
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{
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if (*prev == MTRR_TYPE_UNCACHABLE || *curr == MTRR_TYPE_UNCACHABLE) {
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*prev = MTRR_TYPE_UNCACHABLE;
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*curr = MTRR_TYPE_UNCACHABLE;
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return 1;
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}
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if ((*prev == MTRR_TYPE_WRBACK && *curr == MTRR_TYPE_WRTHROUGH) ||
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(*prev == MTRR_TYPE_WRTHROUGH && *curr == MTRR_TYPE_WRBACK)) {
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*prev = MTRR_TYPE_WRTHROUGH;
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*curr = MTRR_TYPE_WRTHROUGH;
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}
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if (*prev != *curr) {
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*prev = MTRR_TYPE_UNCACHABLE;
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*curr = MTRR_TYPE_UNCACHABLE;
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return 1;
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}
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return 0;
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}
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/**
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* mtrr_type_lookup_fixed - look up memory type in MTRR fixed entries
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*
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* Return the MTRR fixed memory type of 'start'.
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*
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* MTRR fixed entries are divided into the following ways:
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* 0x00000 - 0x7FFFF : This range is divided into eight 64KB sub-ranges
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* 0x80000 - 0xBFFFF : This range is divided into sixteen 16KB sub-ranges
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* 0xC0000 - 0xFFFFF : This range is divided into sixty-four 4KB sub-ranges
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*
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* Return Values:
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* MTRR_TYPE_(type) - Matched memory type
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* MTRR_TYPE_INVALID - Unmatched
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*/
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static u8 mtrr_type_lookup_fixed(u64 start, u64 end)
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{
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int idx;
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if (start >= 0x100000)
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return MTRR_TYPE_INVALID;
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/* 0x0 - 0x7FFFF */
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if (start < 0x80000) {
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idx = 0;
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idx += (start >> 16);
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return mtrr_state.fixed_ranges[idx];
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/* 0x80000 - 0xBFFFF */
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} else if (start < 0xC0000) {
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idx = 1 * 8;
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idx += ((start - 0x80000) >> 14);
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return mtrr_state.fixed_ranges[idx];
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}
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/* 0xC0000 - 0xFFFFF */
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idx = 3 * 8;
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idx += ((start - 0xC0000) >> 12);
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return mtrr_state.fixed_ranges[idx];
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}
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/**
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* mtrr_type_lookup_variable - look up memory type in MTRR variable entries
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*
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* Return Value:
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* MTRR_TYPE_(type) - Matched memory type or default memory type (unmatched)
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*
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* Output Arguments:
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* repeat - Set to 1 when [start:end] spanned across MTRR range and type
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* returned corresponds only to [start:*partial_end]. Caller has
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* to lookup again for [*partial_end:end].
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*
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* uniform - Set to 1 when an MTRR covers the region uniformly, i.e. the
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* region is fully covered by a single MTRR entry or the default
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* type.
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*/
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static u8 mtrr_type_lookup_variable(u64 start, u64 end, u64 *partial_end,
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int *repeat, u8 *uniform)
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{
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int i;
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u64 base, mask;
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u8 prev_match, curr_match;
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*repeat = 0;
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*uniform = 1;
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/* Make end inclusive instead of exclusive */
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end--;
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prev_match = MTRR_TYPE_INVALID;
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for (i = 0; i < num_var_ranges; ++i) {
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unsigned short start_state, end_state, inclusive;
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if (!(mtrr_state.var_ranges[i].mask_lo & (1 << 11)))
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continue;
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base = (((u64)mtrr_state.var_ranges[i].base_hi) << 32) +
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(mtrr_state.var_ranges[i].base_lo & PAGE_MASK);
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mask = (((u64)mtrr_state.var_ranges[i].mask_hi) << 32) +
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(mtrr_state.var_ranges[i].mask_lo & PAGE_MASK);
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start_state = ((start & mask) == (base & mask));
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end_state = ((end & mask) == (base & mask));
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inclusive = ((start < base) && (end > base));
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if ((start_state != end_state) || inclusive) {
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/*
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* We have start:end spanning across an MTRR.
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* We split the region into either
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*
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* - start_state:1
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* (start:mtrr_end)(mtrr_end:end)
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* - end_state:1
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* (start:mtrr_start)(mtrr_start:end)
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* - inclusive:1
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* (start:mtrr_start)(mtrr_start:mtrr_end)(mtrr_end:end)
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*
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* depending on kind of overlap.
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*
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* Return the type of the first region and a pointer
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* to the start of next region so that caller will be
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* advised to lookup again after having adjusted start
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* and end.
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*
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* Note: This way we handle overlaps with multiple
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* entries and the default type properly.
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*/
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if (start_state)
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*partial_end = base + get_mtrr_size(mask);
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else
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*partial_end = base;
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if (unlikely(*partial_end <= start)) {
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WARN_ON(1);
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*partial_end = start + PAGE_SIZE;
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}
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end = *partial_end - 1; /* end is inclusive */
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*repeat = 1;
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*uniform = 0;
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}
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if ((start & mask) != (base & mask))
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continue;
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curr_match = mtrr_state.var_ranges[i].base_lo & 0xff;
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if (prev_match == MTRR_TYPE_INVALID) {
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prev_match = curr_match;
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continue;
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}
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*uniform = 0;
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if (check_type_overlap(&prev_match, &curr_match))
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return curr_match;
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}
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if (prev_match != MTRR_TYPE_INVALID)
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return prev_match;
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return mtrr_state.def_type;
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}
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/**
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* mtrr_type_lookup - look up memory type in MTRR
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*
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* Return Values:
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* MTRR_TYPE_(type) - The effective MTRR type for the region
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* MTRR_TYPE_INVALID - MTRR is disabled
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*
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* Output Argument:
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* uniform - Set to 1 when an MTRR covers the region uniformly, i.e. the
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* region is fully covered by a single MTRR entry or the default
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* type.
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*/
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u8 mtrr_type_lookup(u64 start, u64 end, u8 *uniform)
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{
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u8 type, prev_type, is_uniform = 1, dummy;
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int repeat;
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u64 partial_end;
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if (!mtrr_state_set)
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return MTRR_TYPE_INVALID;
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if (!(mtrr_state.enabled & MTRR_STATE_MTRR_ENABLED))
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return MTRR_TYPE_INVALID;
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/*
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* Look up the fixed ranges first, which take priority over
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* the variable ranges.
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*/
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if ((start < 0x100000) &&
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(mtrr_state.have_fixed) &&
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(mtrr_state.enabled & MTRR_STATE_MTRR_FIXED_ENABLED)) {
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is_uniform = 0;
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type = mtrr_type_lookup_fixed(start, end);
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goto out;
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}
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/*
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* Look up the variable ranges. Look of multiple ranges matching
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* this address and pick type as per MTRR precedence.
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*/
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type = mtrr_type_lookup_variable(start, end, &partial_end,
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&repeat, &is_uniform);
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/*
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* Common path is with repeat = 0.
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* However, we can have cases where [start:end] spans across some
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* MTRR ranges and/or the default type. Do repeated lookups for
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* that case here.
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*/
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while (repeat) {
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prev_type = type;
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start = partial_end;
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is_uniform = 0;
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type = mtrr_type_lookup_variable(start, end, &partial_end,
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&repeat, &dummy);
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if (check_type_overlap(&prev_type, &type))
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goto out;
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}
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if (mtrr_tom2 && (start >= (1ULL<<32)) && (end < mtrr_tom2))
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type = MTRR_TYPE_WRBACK;
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out:
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*uniform = is_uniform;
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return type;
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}
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/* Get the MSR pair relating to a var range */
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static void
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get_mtrr_var_range(unsigned int index, struct mtrr_var_range *vr)
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{
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rdmsr(MTRRphysBase_MSR(index), vr->base_lo, vr->base_hi);
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rdmsr(MTRRphysMask_MSR(index), vr->mask_lo, vr->mask_hi);
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}
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/* Fill the MSR pair relating to a var range */
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void fill_mtrr_var_range(unsigned int index,
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u32 base_lo, u32 base_hi, u32 mask_lo, u32 mask_hi)
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{
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struct mtrr_var_range *vr;
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vr = mtrr_state.var_ranges;
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vr[index].base_lo = base_lo;
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vr[index].base_hi = base_hi;
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vr[index].mask_lo = mask_lo;
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vr[index].mask_hi = mask_hi;
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}
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static void get_fixed_ranges(mtrr_type *frs)
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{
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unsigned int *p = (unsigned int *)frs;
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int i;
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k8_check_syscfg_dram_mod_en();
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rdmsr(MSR_MTRRfix64K_00000, p[0], p[1]);
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for (i = 0; i < 2; i++)
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rdmsr(MSR_MTRRfix16K_80000 + i, p[2 + i * 2], p[3 + i * 2]);
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for (i = 0; i < 8; i++)
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rdmsr(MSR_MTRRfix4K_C0000 + i, p[6 + i * 2], p[7 + i * 2]);
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}
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void mtrr_save_fixed_ranges(void *info)
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{
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if (boot_cpu_has(X86_FEATURE_MTRR))
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get_fixed_ranges(mtrr_state.fixed_ranges);
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}
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static unsigned __initdata last_fixed_start;
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static unsigned __initdata last_fixed_end;
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static mtrr_type __initdata last_fixed_type;
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static void __init print_fixed_last(void)
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{
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if (!last_fixed_end)
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return;
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pr_debug(" %05X-%05X %s\n", last_fixed_start,
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last_fixed_end - 1, mtrr_attrib_to_str(last_fixed_type));
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last_fixed_end = 0;
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}
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static void __init update_fixed_last(unsigned base, unsigned end,
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mtrr_type type)
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{
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last_fixed_start = base;
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last_fixed_end = end;
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last_fixed_type = type;
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}
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static void __init
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print_fixed(unsigned base, unsigned step, const mtrr_type *types)
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{
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unsigned i;
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for (i = 0; i < 8; ++i, ++types, base += step) {
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if (last_fixed_end == 0) {
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update_fixed_last(base, base + step, *types);
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continue;
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}
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if (last_fixed_end == base && last_fixed_type == *types) {
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last_fixed_end = base + step;
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continue;
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}
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/* new segments: gap or different type */
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print_fixed_last();
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update_fixed_last(base, base + step, *types);
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}
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}
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static void prepare_set(void);
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static void post_set(void);
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static void __init print_mtrr_state(void)
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{
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unsigned int i;
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int high_width;
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pr_debug("MTRR default type: %s\n",
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mtrr_attrib_to_str(mtrr_state.def_type));
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if (mtrr_state.have_fixed) {
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pr_debug("MTRR fixed ranges %sabled:\n",
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((mtrr_state.enabled & MTRR_STATE_MTRR_ENABLED) &&
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(mtrr_state.enabled & MTRR_STATE_MTRR_FIXED_ENABLED)) ?
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"en" : "dis");
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print_fixed(0x00000, 0x10000, mtrr_state.fixed_ranges + 0);
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for (i = 0; i < 2; ++i)
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print_fixed(0x80000 + i * 0x20000, 0x04000,
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mtrr_state.fixed_ranges + (i + 1) * 8);
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for (i = 0; i < 8; ++i)
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print_fixed(0xC0000 + i * 0x08000, 0x01000,
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mtrr_state.fixed_ranges + (i + 3) * 8);
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/* tail */
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print_fixed_last();
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}
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pr_debug("MTRR variable ranges %sabled:\n",
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mtrr_state.enabled & MTRR_STATE_MTRR_ENABLED ? "en" : "dis");
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high_width = (__ffs64(size_or_mask) - (32 - PAGE_SHIFT) + 3) / 4;
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for (i = 0; i < num_var_ranges; ++i) {
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if (mtrr_state.var_ranges[i].mask_lo & (1 << 11))
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pr_debug(" %u base %0*X%05X000 mask %0*X%05X000 %s\n",
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i,
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high_width,
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mtrr_state.var_ranges[i].base_hi,
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mtrr_state.var_ranges[i].base_lo >> 12,
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high_width,
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mtrr_state.var_ranges[i].mask_hi,
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mtrr_state.var_ranges[i].mask_lo >> 12,
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mtrr_attrib_to_str(mtrr_state.var_ranges[i].base_lo & 0xff));
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else
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pr_debug(" %u disabled\n", i);
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}
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if (mtrr_tom2)
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pr_debug("TOM2: %016llx aka %lldM\n", mtrr_tom2, mtrr_tom2>>20);
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}
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/* PAT setup for BP. We need to go through sync steps here */
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void __init mtrr_bp_pat_init(void)
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{
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unsigned long flags;
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local_irq_save(flags);
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prepare_set();
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pat_init();
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post_set();
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local_irq_restore(flags);
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}
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/* Grab all of the MTRR state for this CPU into *state */
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bool __init get_mtrr_state(void)
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{
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struct mtrr_var_range *vrs;
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unsigned lo, dummy;
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unsigned int i;
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vrs = mtrr_state.var_ranges;
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rdmsr(MSR_MTRRcap, lo, dummy);
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mtrr_state.have_fixed = (lo >> 8) & 1;
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for (i = 0; i < num_var_ranges; i++)
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get_mtrr_var_range(i, &vrs[i]);
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if (mtrr_state.have_fixed)
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get_fixed_ranges(mtrr_state.fixed_ranges);
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rdmsr(MSR_MTRRdefType, lo, dummy);
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mtrr_state.def_type = (lo & 0xff);
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mtrr_state.enabled = (lo & 0xc00) >> 10;
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if (amd_special_default_mtrr()) {
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unsigned low, high;
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/* TOP_MEM2 */
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rdmsr(MSR_K8_TOP_MEM2, low, high);
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mtrr_tom2 = high;
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mtrr_tom2 <<= 32;
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mtrr_tom2 |= low;
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mtrr_tom2 &= 0xffffff800000ULL;
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}
|
|
|
|
print_mtrr_state();
|
|
|
|
mtrr_state_set = 1;
|
|
|
|
return !!(mtrr_state.enabled & MTRR_STATE_MTRR_ENABLED);
|
|
}
|
|
|
|
/* Some BIOS's are messed up and don't set all MTRRs the same! */
|
|
void __init mtrr_state_warn(void)
|
|
{
|
|
unsigned long mask = smp_changes_mask;
|
|
|
|
if (!mask)
|
|
return;
|
|
if (mask & MTRR_CHANGE_MASK_FIXED)
|
|
pr_warn("mtrr: your CPUs had inconsistent fixed MTRR settings\n");
|
|
if (mask & MTRR_CHANGE_MASK_VARIABLE)
|
|
pr_warn("mtrr: your CPUs had inconsistent variable MTRR settings\n");
|
|
if (mask & MTRR_CHANGE_MASK_DEFTYPE)
|
|
pr_warn("mtrr: your CPUs had inconsistent MTRRdefType settings\n");
|
|
|
|
pr_info("mtrr: probably your BIOS does not setup all CPUs.\n");
|
|
pr_info("mtrr: corrected configuration.\n");
|
|
}
|
|
|
|
/*
|
|
* Doesn't attempt to pass an error out to MTRR users
|
|
* because it's quite complicated in some cases and probably not
|
|
* worth it because the best error handling is to ignore it.
|
|
*/
|
|
void mtrr_wrmsr(unsigned msr, unsigned a, unsigned b)
|
|
{
|
|
if (wrmsr_safe(msr, a, b) < 0) {
|
|
pr_err("MTRR: CPU %u: Writing MSR %x to %x:%x failed\n",
|
|
smp_processor_id(), msr, a, b);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* set_fixed_range - checks & updates a fixed-range MTRR if it
|
|
* differs from the value it should have
|
|
* @msr: MSR address of the MTTR which should be checked and updated
|
|
* @changed: pointer which indicates whether the MTRR needed to be changed
|
|
* @msrwords: pointer to the MSR values which the MSR should have
|
|
*/
|
|
static void set_fixed_range(int msr, bool *changed, unsigned int *msrwords)
|
|
{
|
|
unsigned lo, hi;
|
|
|
|
rdmsr(msr, lo, hi);
|
|
|
|
if (lo != msrwords[0] || hi != msrwords[1]) {
|
|
mtrr_wrmsr(msr, msrwords[0], msrwords[1]);
|
|
*changed = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* generic_get_free_region - Get a free MTRR.
|
|
* @base: The starting (base) address of the region.
|
|
* @size: The size (in bytes) of the region.
|
|
* @replace_reg: mtrr index to be replaced; set to invalid value if none.
|
|
*
|
|
* Returns: The index of the region on success, else negative on error.
|
|
*/
|
|
int
|
|
generic_get_free_region(unsigned long base, unsigned long size, int replace_reg)
|
|
{
|
|
unsigned long lbase, lsize;
|
|
mtrr_type ltype;
|
|
int i, max;
|
|
|
|
max = num_var_ranges;
|
|
if (replace_reg >= 0 && replace_reg < max)
|
|
return replace_reg;
|
|
|
|
for (i = 0; i < max; ++i) {
|
|
mtrr_if->get(i, &lbase, &lsize, <ype);
|
|
if (lsize == 0)
|
|
return i;
|
|
}
|
|
|
|
return -ENOSPC;
|
|
}
|
|
|
|
static void generic_get_mtrr(unsigned int reg, unsigned long *base,
|
|
unsigned long *size, mtrr_type *type)
|
|
{
|
|
u32 mask_lo, mask_hi, base_lo, base_hi;
|
|
unsigned int hi;
|
|
u64 tmp, mask;
|
|
|
|
/*
|
|
* get_mtrr doesn't need to update mtrr_state, also it could be called
|
|
* from any cpu, so try to print it out directly.
|
|
*/
|
|
get_cpu();
|
|
|
|
rdmsr(MTRRphysMask_MSR(reg), mask_lo, mask_hi);
|
|
|
|
if ((mask_lo & 0x800) == 0) {
|
|
/* Invalid (i.e. free) range */
|
|
*base = 0;
|
|
*size = 0;
|
|
*type = 0;
|
|
goto out_put_cpu;
|
|
}
|
|
|
|
rdmsr(MTRRphysBase_MSR(reg), base_lo, base_hi);
|
|
|
|
/* Work out the shifted address mask: */
|
|
tmp = (u64)mask_hi << (32 - PAGE_SHIFT) | mask_lo >> PAGE_SHIFT;
|
|
mask = size_or_mask | tmp;
|
|
|
|
/* Expand tmp with high bits to all 1s: */
|
|
hi = fls64(tmp);
|
|
if (hi > 0) {
|
|
tmp |= ~((1ULL<<(hi - 1)) - 1);
|
|
|
|
if (tmp != mask) {
|
|
pr_warn("mtrr: your BIOS has configured an incorrect mask, fixing it.\n");
|
|
add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
|
|
mask = tmp;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This works correctly if size is a power of two, i.e. a
|
|
* contiguous range:
|
|
*/
|
|
*size = -mask;
|
|
*base = (u64)base_hi << (32 - PAGE_SHIFT) | base_lo >> PAGE_SHIFT;
|
|
*type = base_lo & 0xff;
|
|
|
|
out_put_cpu:
|
|
put_cpu();
|
|
}
|
|
|
|
/**
|
|
* set_fixed_ranges - checks & updates the fixed-range MTRRs if they
|
|
* differ from the saved set
|
|
* @frs: pointer to fixed-range MTRR values, saved by get_fixed_ranges()
|
|
*/
|
|
static int set_fixed_ranges(mtrr_type *frs)
|
|
{
|
|
unsigned long long *saved = (unsigned long long *)frs;
|
|
bool changed = false;
|
|
int block = -1, range;
|
|
|
|
k8_check_syscfg_dram_mod_en();
|
|
|
|
while (fixed_range_blocks[++block].ranges) {
|
|
for (range = 0; range < fixed_range_blocks[block].ranges; range++)
|
|
set_fixed_range(fixed_range_blocks[block].base_msr + range,
|
|
&changed, (unsigned int *)saved++);
|
|
}
|
|
|
|
return changed;
|
|
}
|
|
|
|
/*
|
|
* Set the MSR pair relating to a var range.
|
|
* Returns true if changes are made.
|
|
*/
|
|
static bool set_mtrr_var_ranges(unsigned int index, struct mtrr_var_range *vr)
|
|
{
|
|
unsigned int lo, hi;
|
|
bool changed = false;
|
|
|
|
rdmsr(MTRRphysBase_MSR(index), lo, hi);
|
|
if ((vr->base_lo & 0xfffff0ffUL) != (lo & 0xfffff0ffUL)
|
|
|| (vr->base_hi & (size_and_mask >> (32 - PAGE_SHIFT))) !=
|
|
(hi & (size_and_mask >> (32 - PAGE_SHIFT)))) {
|
|
|
|
mtrr_wrmsr(MTRRphysBase_MSR(index), vr->base_lo, vr->base_hi);
|
|
changed = true;
|
|
}
|
|
|
|
rdmsr(MTRRphysMask_MSR(index), lo, hi);
|
|
|
|
if ((vr->mask_lo & 0xfffff800UL) != (lo & 0xfffff800UL)
|
|
|| (vr->mask_hi & (size_and_mask >> (32 - PAGE_SHIFT))) !=
|
|
(hi & (size_and_mask >> (32 - PAGE_SHIFT)))) {
|
|
mtrr_wrmsr(MTRRphysMask_MSR(index), vr->mask_lo, vr->mask_hi);
|
|
changed = true;
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
static u32 deftype_lo, deftype_hi;
|
|
|
|
/**
|
|
* set_mtrr_state - Set the MTRR state for this CPU.
|
|
*
|
|
* NOTE: The CPU must already be in a safe state for MTRR changes.
|
|
* RETURNS: 0 if no changes made, else a mask indicating what was changed.
|
|
*/
|
|
static unsigned long set_mtrr_state(void)
|
|
{
|
|
unsigned long change_mask = 0;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < num_var_ranges; i++) {
|
|
if (set_mtrr_var_ranges(i, &mtrr_state.var_ranges[i]))
|
|
change_mask |= MTRR_CHANGE_MASK_VARIABLE;
|
|
}
|
|
|
|
if (mtrr_state.have_fixed && set_fixed_ranges(mtrr_state.fixed_ranges))
|
|
change_mask |= MTRR_CHANGE_MASK_FIXED;
|
|
|
|
/*
|
|
* Set_mtrr_restore restores the old value of MTRRdefType,
|
|
* so to set it we fiddle with the saved value:
|
|
*/
|
|
if ((deftype_lo & 0xff) != mtrr_state.def_type
|
|
|| ((deftype_lo & 0xc00) >> 10) != mtrr_state.enabled) {
|
|
|
|
deftype_lo = (deftype_lo & ~0xcff) | mtrr_state.def_type |
|
|
(mtrr_state.enabled << 10);
|
|
change_mask |= MTRR_CHANGE_MASK_DEFTYPE;
|
|
}
|
|
|
|
return change_mask;
|
|
}
|
|
|
|
|
|
static unsigned long cr4;
|
|
static DEFINE_RAW_SPINLOCK(set_atomicity_lock);
|
|
|
|
/*
|
|
* Since we are disabling the cache don't allow any interrupts,
|
|
* they would run extremely slow and would only increase the pain.
|
|
*
|
|
* The caller must ensure that local interrupts are disabled and
|
|
* are reenabled after post_set() has been called.
|
|
*/
|
|
static void prepare_set(void) __acquires(set_atomicity_lock)
|
|
{
|
|
unsigned long cr0;
|
|
|
|
/*
|
|
* Note that this is not ideal
|
|
* since the cache is only flushed/disabled for this CPU while the
|
|
* MTRRs are changed, but changing this requires more invasive
|
|
* changes to the way the kernel boots
|
|
*/
|
|
|
|
raw_spin_lock(&set_atomicity_lock);
|
|
|
|
/* Enter the no-fill (CD=1, NW=0) cache mode and flush caches. */
|
|
cr0 = read_cr0() | X86_CR0_CD;
|
|
write_cr0(cr0);
|
|
|
|
/*
|
|
* Cache flushing is the most time-consuming step when programming
|
|
* the MTRRs. Fortunately, as per the Intel Software Development
|
|
* Manual, we can skip it if the processor supports cache self-
|
|
* snooping.
|
|
*/
|
|
if (!static_cpu_has(X86_FEATURE_SELFSNOOP))
|
|
wbinvd();
|
|
|
|
/* Save value of CR4 and clear Page Global Enable (bit 7) */
|
|
if (boot_cpu_has(X86_FEATURE_PGE)) {
|
|
cr4 = __read_cr4();
|
|
__write_cr4(cr4 & ~X86_CR4_PGE);
|
|
}
|
|
|
|
/* Flush all TLBs via a mov %cr3, %reg; mov %reg, %cr3 */
|
|
count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
|
|
__flush_tlb();
|
|
|
|
/* Save MTRR state */
|
|
rdmsr(MSR_MTRRdefType, deftype_lo, deftype_hi);
|
|
|
|
/* Disable MTRRs, and set the default type to uncached */
|
|
mtrr_wrmsr(MSR_MTRRdefType, deftype_lo & ~0xcff, deftype_hi);
|
|
|
|
/* Again, only flush caches if we have to. */
|
|
if (!static_cpu_has(X86_FEATURE_SELFSNOOP))
|
|
wbinvd();
|
|
}
|
|
|
|
static void post_set(void) __releases(set_atomicity_lock)
|
|
{
|
|
/* Flush TLBs (no need to flush caches - they are disabled) */
|
|
count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
|
|
__flush_tlb();
|
|
|
|
/* Intel (P6) standard MTRRs */
|
|
mtrr_wrmsr(MSR_MTRRdefType, deftype_lo, deftype_hi);
|
|
|
|
/* Enable caches */
|
|
write_cr0(read_cr0() & ~X86_CR0_CD);
|
|
|
|
/* Restore value of CR4 */
|
|
if (boot_cpu_has(X86_FEATURE_PGE))
|
|
__write_cr4(cr4);
|
|
raw_spin_unlock(&set_atomicity_lock);
|
|
}
|
|
|
|
static void generic_set_all(void)
|
|
{
|
|
unsigned long mask, count;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
prepare_set();
|
|
|
|
/* Actually set the state */
|
|
mask = set_mtrr_state();
|
|
|
|
/* also set PAT */
|
|
pat_init();
|
|
|
|
post_set();
|
|
local_irq_restore(flags);
|
|
|
|
/* Use the atomic bitops to update the global mask */
|
|
for (count = 0; count < sizeof(mask) * 8; ++count) {
|
|
if (mask & 0x01)
|
|
set_bit(count, &smp_changes_mask);
|
|
mask >>= 1;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* generic_set_mtrr - set variable MTRR register on the local CPU.
|
|
*
|
|
* @reg: The register to set.
|
|
* @base: The base address of the region.
|
|
* @size: The size of the region. If this is 0 the region is disabled.
|
|
* @type: The type of the region.
|
|
*
|
|
* Returns nothing.
|
|
*/
|
|
static void generic_set_mtrr(unsigned int reg, unsigned long base,
|
|
unsigned long size, mtrr_type type)
|
|
{
|
|
unsigned long flags;
|
|
struct mtrr_var_range *vr;
|
|
|
|
vr = &mtrr_state.var_ranges[reg];
|
|
|
|
local_irq_save(flags);
|
|
prepare_set();
|
|
|
|
if (size == 0) {
|
|
/*
|
|
* The invalid bit is kept in the mask, so we simply
|
|
* clear the relevant mask register to disable a range.
|
|
*/
|
|
mtrr_wrmsr(MTRRphysMask_MSR(reg), 0, 0);
|
|
memset(vr, 0, sizeof(struct mtrr_var_range));
|
|
} else {
|
|
vr->base_lo = base << PAGE_SHIFT | type;
|
|
vr->base_hi = (base & size_and_mask) >> (32 - PAGE_SHIFT);
|
|
vr->mask_lo = -size << PAGE_SHIFT | 0x800;
|
|
vr->mask_hi = (-size & size_and_mask) >> (32 - PAGE_SHIFT);
|
|
|
|
mtrr_wrmsr(MTRRphysBase_MSR(reg), vr->base_lo, vr->base_hi);
|
|
mtrr_wrmsr(MTRRphysMask_MSR(reg), vr->mask_lo, vr->mask_hi);
|
|
}
|
|
|
|
post_set();
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
int generic_validate_add_page(unsigned long base, unsigned long size,
|
|
unsigned int type)
|
|
{
|
|
unsigned long lbase, last;
|
|
|
|
/*
|
|
* For Intel PPro stepping <= 7
|
|
* must be 4 MiB aligned and not touch 0x70000000 -> 0x7003FFFF
|
|
*/
|
|
if (is_cpu(INTEL) && boot_cpu_data.x86 == 6 &&
|
|
boot_cpu_data.x86_model == 1 &&
|
|
boot_cpu_data.x86_stepping <= 7) {
|
|
if (base & ((1 << (22 - PAGE_SHIFT)) - 1)) {
|
|
pr_warn("mtrr: base(0x%lx000) is not 4 MiB aligned\n", base);
|
|
return -EINVAL;
|
|
}
|
|
if (!(base + size < 0x70000 || base > 0x7003F) &&
|
|
(type == MTRR_TYPE_WRCOMB
|
|
|| type == MTRR_TYPE_WRBACK)) {
|
|
pr_warn("mtrr: writable mtrr between 0x70000000 and 0x7003FFFF may hang the CPU.\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check upper bits of base and last are equal and lower bits are 0
|
|
* for base and 1 for last
|
|
*/
|
|
last = base + size - 1;
|
|
for (lbase = base; !(lbase & 1) && (last & 1);
|
|
lbase = lbase >> 1, last = last >> 1)
|
|
;
|
|
if (lbase != last) {
|
|
pr_warn("mtrr: base(0x%lx000) is not aligned on a size(0x%lx000) boundary\n", base, size);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int generic_have_wrcomb(void)
|
|
{
|
|
unsigned long config, dummy;
|
|
rdmsr(MSR_MTRRcap, config, dummy);
|
|
return config & (1 << 10);
|
|
}
|
|
|
|
int positive_have_wrcomb(void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Generic structure...
|
|
*/
|
|
const struct mtrr_ops generic_mtrr_ops = {
|
|
.use_intel_if = 1,
|
|
.set_all = generic_set_all,
|
|
.get = generic_get_mtrr,
|
|
.get_free_region = generic_get_free_region,
|
|
.set = generic_set_mtrr,
|
|
.validate_add_page = generic_validate_add_page,
|
|
.have_wrcomb = generic_have_wrcomb,
|
|
};
|