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/*
* Copyright (c) 2014 Google, Inc
*
* From Coreboot file of the same name
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _ASM_MTRR_H
#define _ASM_MTRR_H
/* MTRR region types */
#define MTRR_TYPE_UNCACHEABLE 0
#define MTRR_TYPE_WRCOMB 1
#define MTRR_TYPE_WRTHROUGH 4
#define MTRR_TYPE_WRPROT 5
#define MTRR_TYPE_WRBACK 6
#define MTRR_TYPE_COUNT 7
#define MTRR_CAP_MSR 0x0fe
#define MTRR_DEF_TYPE_MSR 0x2ff
#define MTRR_DEF_TYPE_EN (1 << 11)
#define MTRR_DEF_TYPE_FIX_EN (1 << 10)
#define MTRR_PHYS_BASE_MSR(reg) (0x200 + 2 * (reg))
#define MTRR_PHYS_MASK_MSR(reg) (0x200 + 2 * (reg) + 1)
#define MTRR_PHYS_MASK_VALID (1 << 11)
#define MTRR_BASE_TYPE_MASK 0x7
/* Number of MTRRs supported */
#define MTRR_COUNT 8
#if !defined(__ASSEMBLER__)
/**
* Information about the previous MTRR state, set up by mtrr_open()
*
* @deftype: Previous value of MTRR_DEF_TYPE_MSR
* @enable_cache: true if cache was enabled
*/
struct mtrr_state {
uint64_t deftype;
bool enable_cache;
};
/**
* mtrr_open() - Prepare to adjust MTRRs
*
* Use mtrr_open() passing in a structure - this function will init it. Then
* when done, pass the same structure to mtrr_close() to re-enable MTRRs and
* possibly the cache.
*
* @state: Empty structure to pass in to hold settings
*/
void mtrr_open(struct mtrr_state *state);
/**
* mtrr_open() - Clean up after adjusting MTRRs, and enable them
*
* This uses the structure containing information returned from mtrr_open().
*
* @state: Structure from mtrr_open()
*/
void mtrr_close(struct mtrr_state *state);
/**
* mtrr_add_request() - Add a new MTRR request
*
* This adds a request for a memory region to be set up in a particular way.
*
* @type: Requested type (MTRR_TYPE_)
* @start: Start address
* @size: Size
*
* @return: 0 on success, non-zero on failure
*/
int mtrr_add_request(int type, uint64_t start, uint64_t size);
/**
* mtrr_commit() - set up the MTRR registers based on current requests
*
* This sets up MTRRs for the available DRAM and the requests received so far.
* It must be called with caches disabled.
*
* @do_caches: true if caches are currently on
*
* @return: 0 on success, non-zero on failure
*/
int mtrr_commit(bool do_caches);
#endif
#if ((CONFIG_XIP_ROM_SIZE & (CONFIG_XIP_ROM_SIZE - 1)) != 0)
# error "CONFIG_XIP_ROM_SIZE is not a power of 2"
#endif
#if ((CONFIG_CACHE_ROM_SIZE & (CONFIG_CACHE_ROM_SIZE - 1)) != 0)
# error "CONFIG_CACHE_ROM_SIZE is not a power of 2"
#endif
#define CACHE_ROM_BASE (((1 << 20) - (CONFIG_CACHE_ROM_SIZE >> 12)) << 12)
#endif
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