1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright (c) 2014 Google, Inc
4  *
5  * From Coreboot file of the same name
6  */
7 
8 #ifndef _ASM_MTRR_H
9 #define _ASM_MTRR_H
10 
11 /* MTRR region types */
12 #define MTRR_TYPE_UNCACHEABLE	0
13 #define MTRR_TYPE_WRCOMB	1
14 #define MTRR_TYPE_WRTHROUGH	4
15 #define MTRR_TYPE_WRPROT	5
16 #define MTRR_TYPE_WRBACK	6
17 
18 #define MTRR_TYPE_COUNT		7
19 
20 #define MTRR_CAP_MSR		0x0fe
21 #define MTRR_DEF_TYPE_MSR	0x2ff
22 
23 #define MTRR_CAP_SMRR		(1 << 11)
24 #define MTRR_CAP_WC		(1 << 10)
25 #define MTRR_CAP_FIX		(1 << 8)
26 #define MTRR_CAP_VCNT_MASK	0xff
27 
28 #define MTRR_DEF_TYPE_MASK	0xff
29 #define MTRR_DEF_TYPE_EN	(1 << 11)
30 #define MTRR_DEF_TYPE_FIX_EN	(1 << 10)
31 
32 #define MTRR_PHYS_BASE_MSR(reg)	(0x200 + 2 * (reg))
33 #define MTRR_PHYS_MASK_MSR(reg)	(0x200 + 2 * (reg) + 1)
34 
35 #define MTRR_PHYS_MASK_VALID	(1 << 11)
36 
37 #define MTRR_BASE_TYPE_MASK	0x7
38 
39 /* Maximum number of MTRRs supported - see also mtrr_get_var_count() */
40 #define MTRR_MAX_COUNT		10
41 
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)
45 
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
57 
58 #define MTRR_FIX_TYPE(t)	((t << 24) | (t << 16) | (t << 8) | t)
59 
60 #if !defined(__ASSEMBLY__)
61 
62 /**
63  * Information about the previous MTRR state, set up by mtrr_open()
64  *
65  * @deftype:		Previous value of MTRR_DEF_TYPE_MSR
66  * @enable_cache:	true if cache was enabled
67  */
68 struct mtrr_state {
69 	uint64_t deftype;
70 	bool enable_cache;
71 };
72 
73 /**
74  * struct mtrr - Information about a single MTRR
75  *
76  * @base: Base address and MTRR_BASE_TYPE_MASK
77  * @mask: Mask and MTRR_PHYS_MASK_VALID
78  */
79 struct mtrr {
80 	u64 base;
81 	u64 mask;
82 };
83 
84 /**
85  * struct mtrr_info - Information about all MTRRs
86  *
87  * @mtrr: Information about each mtrr
88  */
89 struct mtrr_info {
90 	struct mtrr mtrr[MTRR_MAX_COUNT];
91 };
92 
93 /**
94  * mtrr_open() - Prepare to adjust MTRRs
95  *
96  * Use mtrr_open() passing in a structure - this function will init it. Then
97  * when done, pass the same structure to mtrr_close() to re-enable MTRRs and
98  * possibly the cache.
99  *
100  * @state:	Empty structure to pass in to hold settings
101  * @do_caches:	true to disable caches before opening
102  */
103 void mtrr_open(struct mtrr_state *state, bool do_caches);
104 
105 /**
106  * mtrr_open() - Clean up after adjusting MTRRs, and enable them
107  *
108  * This uses the structure containing information returned from mtrr_open().
109  *
110  * @state:	Structure from mtrr_open()
111  * @state:	true to restore cache state to that before mtrr_open()
112  */
113 void mtrr_close(struct mtrr_state *state, bool do_caches);
114 
115 /**
116  * mtrr_add_request() - Add a new MTRR request
117  *
118  * This adds a request for a memory region to be set up in a particular way.
119  *
120  * @type:	Requested type (MTRR_TYPE_)
121  * @start:	Start address
122  * @size:	Size
123  *
124  * @return:	0 on success, non-zero on failure
125  */
126 int mtrr_add_request(int type, uint64_t start, uint64_t size);
127 
128 /**
129  * mtrr_commit() - set up the MTRR registers based on current requests
130  *
131  * This sets up MTRRs for the available DRAM and the requests received so far.
132  * It must be called with caches disabled.
133  *
134  * @do_caches:	true if caches are currently on
135  *
136  * @return:	0 on success, non-zero on failure
137  */
138 int mtrr_commit(bool do_caches);
139 
140 /**
141  * mtrr_set_next_var() - set up a variable MTRR
142  *
143  * This finds the first free variable MTRR and sets to the given area
144  *
145  * @type:	Requested type (MTRR_TYPE_)
146  * @start:	Start address
147  * @size:	Size
148  * @return 0 on success, -ENOSPC if there are no more MTRRs
149  */
150 int mtrr_set_next_var(uint type, uint64_t base, uint64_t size);
151 
152 /**
153  * mtrr_read_all() - Save all the MTRRs
154  *
155  * This reads all MTRRs from the boot CPU into a struct so they can be loaded
156  * onto other CPUs
157  *
158  * @info: Place to put the MTRR info
159  */
160 void mtrr_read_all(struct mtrr_info *info);
161 
162 /**
163  * mtrr_set_valid() - Set the valid flag for a selected MTRR and CPU(s)
164  *
165  * @cpu_select: Selected CPUs (either a CPU number or MP_SELECT_...)
166  * @reg: MTRR register to write (0-7)
167  * @valid: Valid flag to write
168  * @return 0 on success, -ve on error
169  */
170 int mtrr_set_valid(int cpu_select, int reg, bool valid);
171 
172 /**
173  * mtrr_set() - Set the valid flag for a selected MTRR and CPU(s)
174  *
175  * @cpu_select: Selected CPUs (either a CPU number or MP_SELECT_...)
176  * @reg: MTRR register to write (0-7)
177  * @base: Base address and MTRR_BASE_TYPE_MASK
178  * @mask: Mask and MTRR_PHYS_MASK_VALID
179  * @return 0 on success, -ve on error
180  */
181 int mtrr_set(int cpu_select, int reg, u64 base, u64 mask);
182 
183 /**
184  * mtrr_get_var_count() - Get the number of variable MTRRs
185  *
186  * Some CPUs have more than 8 MTRRs. This function returns the actual number
187  *
188  * @return number of variable MTRRs
189  */
190 int mtrr_get_var_count(void);
191 
192 #endif
193 
194 #if ((CONFIG_XIP_ROM_SIZE & (CONFIG_XIP_ROM_SIZE - 1)) != 0)
195 # error "CONFIG_XIP_ROM_SIZE is not a power of 2"
196 #endif
197 
198 #if ((CONFIG_CACHE_ROM_SIZE & (CONFIG_CACHE_ROM_SIZE - 1)) != 0)
199 # error "CONFIG_CACHE_ROM_SIZE is not a power of 2"
200 #endif
201 
202 #define CACHE_ROM_BASE	(((1 << 20) - (CONFIG_CACHE_ROM_SIZE >> 12)) << 12)
203 
204 #endif
205