Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hpa/linux-2.6-x86setup
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hpa/linux-2.6-x86setup:
[x86 setup] Handle case of improperly terminated E820 chain
+23
-7
arch/i386/boot/memory.c
+23
-7
arch/i386/boot/memory.c
···
20
21
static int detect_memory_e820(void)
22
{
23
u32 next = 0;
24
u32 size, id;
25
u8 err;
···
34
"=m" (*desc)
35
: "D" (desc), "a" (0xe820));
36
37
-
if (err || id != SMAP)
38
break;
39
40
-
boot_params.e820_entries++;
41
desc++;
42
-
} while (next && boot_params.e820_entries < E820MAX);
43
44
-
return boot_params.e820_entries;
45
}
46
47
static int detect_memory_e801(void)
···
100
101
int detect_memory(void)
102
{
103
if (detect_memory_e820() > 0)
104
-
return 0;
105
106
if (!detect_memory_e801())
107
-
return 0;
108
109
-
return detect_memory_88();
110
}
···
20
21
static int detect_memory_e820(void)
22
{
23
+
int count = 0;
24
u32 next = 0;
25
u32 size, id;
26
u8 err;
···
33
"=m" (*desc)
34
: "D" (desc), "a" (0xe820));
35
36
+
/* Some BIOSes stop returning SMAP in the middle of
37
+
the search loop. We don't know exactly how the BIOS
38
+
screwed up the map at that point, we might have a
39
+
partial map, the full map, or complete garbage, so
40
+
just return failure. */
41
+
if (id != SMAP) {
42
+
count = 0;
43
+
break;
44
+
}
45
+
46
+
if (err)
47
break;
48
49
+
count++;
50
desc++;
51
+
} while (next && count < E820MAX);
52
53
+
return boot_params.e820_entries = count;
54
}
55
56
static int detect_memory_e801(void)
···
89
90
int detect_memory(void)
91
{
92
+
int err = -1;
93
+
94
if (detect_memory_e820() > 0)
95
+
err = 0;
96
97
if (!detect_memory_e801())
98
+
err = 0;
99
100
+
if (!detect_memory_88())
101
+
err = 0;
102
+
103
+
return err;
104
}