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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / effcf067df5f986b8f9a2ca5101c74495be700ab / . / arch / x86 / cpu / ivybridge / car.S
blob: dca68e4144cff4f1919bfa7d88cf1d062d9126f4 [file] [log] [blame]
Simon Glass8ef07572014-11-12 22:42:07 -0700[diff] [blame]1/*
2 * Copyright (c) 2014 Google, Inc
3 *
4 * From Coreboot file cpu/intel/model_206ax/cache_as_ram.inc
5 *
6 * Copyright (C) 2000,2007 Ronald G. Minnich <rminnich@gmail.com>
7 * Copyright (C) 2005 Tyan (written by Yinghai Lu for Tyan)
8 * Copyright (C) 2007-2008 coresystems GmbH
9 * Copyright (C) 2012 Kyösti Mälkki <kyosti.malkki@gmail.com>
10 *
11 * SPDX-License-Identifier: GPL-2.0
12 */
13
14#include <common.h>
Simon Glass70a09c62014-11-12 22:42:10 -0700[diff] [blame]15#include <asm/mtrr.h>
16#include <asm/post.h>
17#include <asm/processor-flags.h>
Simon Glass8ef07572014-11-12 22:42:07 -0700[diff] [blame]18
Simon Glass70a09c62014-11-12 22:42:10 -0700[diff] [blame]19#define MTRR_PHYS_BASE_MSR(reg) (0x200 + 2 * (reg))
20#define MTRR_PHYS_MASK_MSR(reg) (0x200 + 2 * (reg) + 1)
21
22#define CACHE_AS_RAM_SIZE CONFIG_DCACHE_RAM_SIZE
23#define CACHE_AS_RAM_BASE CONFIG_DCACHE_RAM_BASE
24
25/* Cache 4GB - MRC_SIZE_KB for MRC */
26#define CACHE_MRC_BYTES ((CONFIG_CACHE_MRC_SIZE_KB << 10) - 1)
27#define CACHE_MRC_BASE (0xFFFFFFFF - CACHE_MRC_BYTES)
28#define CACHE_MRC_MASK (~CACHE_MRC_BYTES)
29
30#define CPU_PHYSMASK_HI (1 << (CONFIG_CPU_ADDR_BITS - 32) - 1)
31
32#define NOEVICTMOD_MSR 0x2e0
33
34 /*
35 * Note: ebp must not be touched in this code as it holds the BIST
36 * value (built-in self test). We preserve this value until it can
37 * be written to global_data when CAR is ready for use.
38 */
Simon Glass8ef07572014-11-12 22:42:07 -0700[diff] [blame]39.globl car_init
40car_init:
Simon Glass70a09c62014-11-12 22:42:10 -0700[diff] [blame]41 post_code(POST_CAR_START)
42
43 /* Send INIT IPI to all excluding ourself */
44 movl $0x000C4500, %eax
45 movl $0xFEE00300, %esi
46 movl %eax, (%esi)
47
48 post_code(POST_CAR_SIPI)
49 /* Zero out all fixed range and variable range MTRRs */
50 movl $mtrr_table, %esi
51 movl $((mtrr_table_end - mtrr_table) / 2), %edi
52 xorl %eax, %eax
53 xorl %edx, %edx
54clear_mtrrs:
55 movw (%esi), %bx
56 movzx %bx, %ecx
57 wrmsr
58 add $2, %esi
59 dec %edi
60 jnz clear_mtrrs
61
62 post_code(POST_CAR_MTRR)
63 /* Configure the default memory type to uncacheable */
64 movl $MTRRdefType_MSR, %ecx
65 rdmsr
66 andl $(~0x00000cff), %eax
67 wrmsr
68
69 post_code(POST_CAR_UNCACHEABLE)
70 /* Set Cache-as-RAM base address */
71 movl $(MTRR_PHYS_BASE_MSR(0)), %ecx
72 movl $(CACHE_AS_RAM_BASE | MTRR_TYPE_WRBACK), %eax
73 xorl %edx, %edx
74 wrmsr
75
76 post_code(POST_CAR_BASE_ADDRESS)
77 /* Set Cache-as-RAM mask */
78 movl $(MTRR_PHYS_MASK_MSR(0)), %ecx
79 movl $(~(CACHE_AS_RAM_SIZE - 1) | MTRRphysMaskValid), %eax
80 movl $CPU_PHYSMASK_HI, %edx
81 wrmsr
82
83 post_code(POST_CAR_MASK)
84
85 /* Enable MTRR */
86 movl $MTRRdefType_MSR, %ecx
87 rdmsr
88 orl $MTRRdefTypeEn, %eax
89 wrmsr
90
91 /* Enable cache (CR0.CD = 0, CR0.NW = 0) */
92 movl %cr0, %eax
93 andl $(~(X86_CR0_CD | X86_CR0_NW)), %eax
94 invd
95 movl %eax, %cr0
96
97 /* enable the 'no eviction' mode */
98 movl $NOEVICTMOD_MSR, %ecx
99 rdmsr
100 orl $1, %eax
101 andl $~2, %eax
102 wrmsr
103
104 /* Clear the cache memory region. This will also fill up the cache */
105 movl $CACHE_AS_RAM_BASE, %esi
106 movl %esi, %edi
107 movl $(CACHE_AS_RAM_SIZE / 4), %ecx
108 xorl %eax, %eax
109 rep stosl
110
111 /* enable the 'no eviction run' state */
112 movl $NOEVICTMOD_MSR, %ecx
113 rdmsr
114 orl $3, %eax
115 wrmsr
116
117 post_code(POST_CAR_FILL)
118 /* Enable Cache-as-RAM mode by disabling cache */
119 movl %cr0, %eax
120 orl $X86_CR0_CD, %eax
121 movl %eax, %cr0
122
123 /* Enable cache for our code in Flash because we do XIP here */
124 movl $MTRR_PHYS_BASE_MSR(1), %ecx
125 xorl %edx, %edx
126 movl $car_init_ret, %eax
127 andl $(~(CONFIG_XIP_ROM_SIZE - 1)), %eax
128 orl $MTRR_TYPE_WRPROT, %eax
129 wrmsr
130
131 movl $MTRR_PHYS_MASK_MSR(1), %ecx
132 movl $CPU_PHYSMASK_HI, %edx
133 movl $(~(CONFIG_XIP_ROM_SIZE - 1) | MTRRphysMaskValid), %eax
134 wrmsr
135
136 post_code(POST_CAR_ROM_CACHE)
137#ifdef CONFIG_CACHE_MRC_BIN
138 /* Enable caching for ram init code to run faster */
139 movl $MTRR_PHYS_BASE_MSR(2), %ecx
140 movl $(CACHE_MRC_BASE | MTRR_TYPE_WRPROT), %eax
141 xorl %edx, %edx
142 wrmsr
143 movl $MTRR_PHYS_MASK_MSR(2), %ecx
144 movl $(CACHE_MRC_MASK | MTRRphysMaskValid), %eax
145 movl $CPU_PHYSMASK_HI, %edx
146 wrmsr
147#endif
148
149 post_code(POST_CAR_MRC_CACHE)
150 /* Enable cache */
151 movl %cr0, %eax
152 andl $(~(X86_CR0_CD | X86_CR0_NW)), %eax
153 movl %eax, %cr0
154
155 post_code(POST_CAR_CPU_CACHE)
156
157 /* All CPUs need to be in Wait for SIPI state */
158wait_for_sipi:
159 movl (%esi), %eax
160 bt $12, %eax
161 jc wait_for_sipi
162
163 /* return */
Simon Glass8ef07572014-11-12 22:42:07 -0700[diff] [blame]164 jmp car_init_ret
Simon Glass70a09c62014-11-12 22:42:10 -0700[diff] [blame]165
166mtrr_table:
167 /* Fixed MTRRs */
168 .word 0x250, 0x258, 0x259
169 .word 0x268, 0x269, 0x26A
170 .word 0x26B, 0x26C, 0x26D
171 .word 0x26E, 0x26F
172 /* Variable MTRRs */
173 .word 0x200, 0x201, 0x202, 0x203
174 .word 0x204, 0x205, 0x206, 0x207
175 .word 0x208, 0x209, 0x20A, 0x20B
176 .word 0x20C, 0x20D, 0x20E, 0x20F
177 .word 0x210, 0x211, 0x212, 0x213
178mtrr_table_end: