1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <cpu/x86/post_code.h>
#define CBFS_FILE_MAGIC 0
#define CBFS_FILE_LEN (CBFS_FILE_MAGIC + 8)
#define CBFS_FILE_TYPE (CBFS_FILE_LEN + 4)
#define CBFS_FILE_CHECKSUM (CBFS_FILE_TYPE + 4)
#define CBFS_FILE_OFFSET (CBFS_FILE_CHECKSUM + 4)
.section .init, "ax", @progbits
.code32
.global bootblock_pre_c_entry
bootblock_pre_c_entry:
cache_as_ram:
post_code(0x20)
/*
* Nothing to do here on qemu, RAM works just fine without any
* initialization.
*/
/* Clear the cache memory region. This will also clear CAR GLOBAL */
movl $_car_region_start, %edi
movl $_car_region_end, %ecx
sub %edi, %ecx
shr $2, %ecx
xorl %eax, %eax
rep stosl
post_code(0x21)
#if defined(__x86_64__)
/*
* Copy page tables to final location in DRAM. This prevents some strange
* bugs when running KVM enabled:
* Accessing MMX instructions in long mode causes an abort
* Some physical addresses aren't properly translated
* Emulation fault on every instruction fetched due to page tables in ROM
* Enabling or disabling paging causes a fault
*
* First, find page tables in CBFS:
*/
lea pagetables_name, %esi
mov $1f, %esp
jmp walkcbfs_asm
1:
cmpl $0, %eax
je .Lhlt
/* Test if page tables are memory-mapped and skip relocation */
cmpl $(CONFIG_ARCH_X86_64_PGTBL_LOC), %eax
je pages_done
movl CBFS_FILE_OFFSET(%eax), %ebx
bswap %ebx
addl %eax, %ebx
movl %ebx, %esi
movl CBFS_FILE_LEN(%eax), %ecx
bswap %ecx
shr $2, %ecx
movl $(CONFIG_ARCH_X86_64_PGTBL_LOC), %edi
loop:
movl (%esi), %eax
movl %eax, (%edi)
addl $4, %esi
addl $4, %edi
decl %ecx
jnz loop
pages_done:
#endif
movl $_ecar_stack, %esp
/* Align the stack and keep aligned for call to bootblock_c_entry() */
and $0xfffffff0, %esp
/* entry64.inc preserves ebx. */
#include <cpu/x86/64bit/entry64.inc>
/* Restore the BIST result and timestamps. */
#if ENV_X86_64
movd %mm2, %rdi
shlq $32, %rdi
movd %mm1, %rsi
or %rsi, %rdi
movd %mm0, %rsi
#else
sub $4, %esp
movd %mm0, %ebx
movd %mm1, %eax
movd %mm2, %edx
pushl %ebx
pushl %edx
pushl %eax
#endif
before_c_entry:
post_code(0x29)
call bootblock_c_entry_bist
/* Never returns */
.Lhlt:
post_code(POST_DEAD_CODE)
hlt
jmp .Lhlt
pagetables_name:
.string "pagetables"
|
