2 * Copyright (c) 2014 Google, Inc
4 * From Coreboot file of the same name
6 * SPDX-License-Identifier: GPL-2.0+
12 /* MTRR region types */
13 #define MTRR_TYPE_UNCACHEABLE 0
14 #define MTRR_TYPE_WRCOMB 1
15 #define MTRR_TYPE_WRTHROUGH 4
16 #define MTRR_TYPE_WRPROT 5
17 #define MTRR_TYPE_WRBACK 6
19 #define MTRR_TYPE_COUNT 7
21 #define MTRR_CAP_MSR 0x0fe
22 #define MTRR_DEF_TYPE_MSR 0x2ff
24 #define MTRR_CAP_SMRR (1 << 11)
25 #define MTRR_CAP_WC (1 << 10)
26 #define MTRR_CAP_FIX (1 << 8)
27 #define MTRR_CAP_VCNT_MASK 0xff
29 #define MTRR_DEF_TYPE_EN (1 << 11)
30 #define MTRR_DEF_TYPE_FIX_EN (1 << 10)
32 #define MTRR_PHYS_BASE_MSR(reg) (0x200 + 2 * (reg))
33 #define MTRR_PHYS_MASK_MSR(reg) (0x200 + 2 * (reg) + 1)
35 #define MTRR_PHYS_MASK_VALID (1 << 11)
37 #define MTRR_BASE_TYPE_MASK 0x7
39 /* Number of MTRRs supported */
42 #define NUM_FIXED_MTRRS 11
43 #define RANGES_PER_FIXED_MTRR 8
44 #define NUM_FIXED_RANGES (NUM_FIXED_MTRRS * RANGES_PER_FIXED_MTRR)
46 #define MTRR_FIX_64K_00000_MSR 0x250
47 #define MTRR_FIX_16K_80000_MSR 0x258
48 #define MTRR_FIX_16K_A0000_MSR 0x259
49 #define MTRR_FIX_4K_C0000_MSR 0x268
50 #define MTRR_FIX_4K_C8000_MSR 0x269
51 #define MTRR_FIX_4K_D0000_MSR 0x26a
52 #define MTRR_FIX_4K_D8000_MSR 0x26b
53 #define MTRR_FIX_4K_E0000_MSR 0x26c
54 #define MTRR_FIX_4K_E8000_MSR 0x26d
55 #define MTRR_FIX_4K_F0000_MSR 0x26e
56 #define MTRR_FIX_4K_F8000_MSR 0x26f
58 #if !defined(__ASSEMBLER__)
61 * Information about the previous MTRR state, set up by mtrr_open()
63 * @deftype: Previous value of MTRR_DEF_TYPE_MSR
64 * @enable_cache: true if cache was enabled
72 * mtrr_open() - Prepare to adjust MTRRs
74 * Use mtrr_open() passing in a structure - this function will init it. Then
75 * when done, pass the same structure to mtrr_close() to re-enable MTRRs and
78 * @state: Empty structure to pass in to hold settings
80 void mtrr_open(struct mtrr_state *state);
83 * mtrr_open() - Clean up after adjusting MTRRs, and enable them
85 * This uses the structure containing information returned from mtrr_open().
87 * @state: Structure from mtrr_open()
89 void mtrr_close(struct mtrr_state *state);
92 * mtrr_add_request() - Add a new MTRR request
94 * This adds a request for a memory region to be set up in a particular way.
96 * @type: Requested type (MTRR_TYPE_)
97 * @start: Start address
100 * @return: 0 on success, non-zero on failure
102 int mtrr_add_request(int type, uint64_t start, uint64_t size);
105 * mtrr_commit() - set up the MTRR registers based on current requests
107 * This sets up MTRRs for the available DRAM and the requests received so far.
108 * It must be called with caches disabled.
110 * @do_caches: true if caches are currently on
112 * @return: 0 on success, non-zero on failure
114 int mtrr_commit(bool do_caches);
118 #if ((CONFIG_XIP_ROM_SIZE & (CONFIG_XIP_ROM_SIZE - 1)) != 0)
119 # error "CONFIG_XIP_ROM_SIZE is not a power of 2"
122 #if ((CONFIG_CACHE_ROM_SIZE & (CONFIG_CACHE_ROM_SIZE - 1)) != 0)
123 # error "CONFIG_CACHE_ROM_SIZE is not a power of 2"
126 #define CACHE_ROM_BASE (((1 << 20) - (CONFIG_CACHE_ROM_SIZE >> 12)) << 12)