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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
// SPDX-License-Identifier: GPL-2.0-only
#define pr_fmt(fmt) "efi: " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/efi.h>
#include <linux/libfdt.h>
#include <linux/of_fdt.h>
#include <asm/unaligned.h>
enum {
SYSTAB,
MMBASE,
MMSIZE,
DCSIZE,
DCVERS,
PARAMCOUNT
};
static __initconst const char name[][22] = {
[SYSTAB] = "System Table ",
[MMBASE] = "MemMap Address ",
[MMSIZE] = "MemMap Size ",
[DCSIZE] = "MemMap Desc. Size ",
[DCVERS] = "MemMap Desc. Version ",
};
static __initconst const struct {
const char path[17];
u8 paravirt;
const char params[PARAMCOUNT][26];
} dt_params[] = {
{
#ifdef CONFIG_XEN // <-------17------>
.path = "/hypervisor/uefi",
.paravirt = 1,
.params = {
[SYSTAB] = "xen,uefi-system-table",
[MMBASE] = "xen,uefi-mmap-start",
[MMSIZE] = "xen,uefi-mmap-size",
[DCSIZE] = "xen,uefi-mmap-desc-size",
[DCVERS] = "xen,uefi-mmap-desc-ver",
}
}, {
#endif
.path = "/chosen",
.params = { // <-----------26----------->
[SYSTAB] = "linux,uefi-system-table",
[MMBASE] = "linux,uefi-mmap-start",
[MMSIZE] = "linux,uefi-mmap-size",
[DCSIZE] = "linux,uefi-mmap-desc-size",
[DCVERS] = "linux,uefi-mmap-desc-ver",
}
}
};
static int __init efi_get_fdt_prop(const void *fdt, int node, const char *pname,
const char *rname, void *var, int size)
{
const void *prop;
int len;
u64 val;
prop = fdt_getprop(fdt, node, pname, &len);
if (!prop)
return 1;
val = (len == 4) ? (u64)be32_to_cpup(prop) : get_unaligned_be64(prop);
if (size == 8)
*(u64 *)var = val;
else
*(u32 *)var = (val < U32_MAX) ? val : U32_MAX; // saturate
if (efi_enabled(EFI_DBG))
pr_info(" %s: 0x%0*llx\n", rname, size * 2, val);
return 0;
}
u64 __init efi_get_fdt_params(struct efi_memory_map_data *mm)
{
const void *fdt = initial_boot_params;
unsigned long systab;
int i, j, node;
struct {
void *var;
int size;
} target[] = {
[SYSTAB] = { &systab, sizeof(systab) },
[MMBASE] = { &mm->phys_map, sizeof(mm->phys_map) },
[MMSIZE] = { &mm->size, sizeof(mm->size) },
[DCSIZE] = { &mm->desc_size, sizeof(mm->desc_size) },
[DCVERS] = { &mm->desc_version, sizeof(mm->desc_version) },
};
BUILD_BUG_ON(ARRAY_SIZE(target) != ARRAY_SIZE(name));
BUILD_BUG_ON(ARRAY_SIZE(target) != ARRAY_SIZE(dt_params[0].params));
if (!fdt)
return 0;
for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
node = fdt_path_offset(fdt, dt_params[i].path);
if (node < 0)
continue;
if (efi_enabled(EFI_DBG))
pr_info("Getting UEFI parameters from %s in DT:\n",
dt_params[i].path);
for (j = 0; j < ARRAY_SIZE(target); j++) {
const char *pname = dt_params[i].params[j];
if (!efi_get_fdt_prop(fdt, node, pname, name[j],
target[j].var, target[j].size))
continue;
if (!j)
goto notfound;
pr_err("Can't find property '%s' in DT!\n", pname);
return 0;
}
if (dt_params[i].paravirt)
set_bit(EFI_PARAVIRT, &efi.flags);
return systab;
}
notfound:
pr_info("UEFI not found.\n");
return 0;
}
|
