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Detect if kernel doesn't have kexec syscall enabled

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This commit is contained in:
Vojtech Bocek
2015-05-28 23:59:48 +02:00
parent d8daf27d8d
commit 4b3da31b90
1 changed files with 52 additions and 45 deletions
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97
multirom.c
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@@ -1469,60 +1469,67 @@ int multirom_has_kexec(void)
#if MR_DEVICE_HOOKS >= 5
has_kexec = mrom_hook_has_kexec();
if(has_kexec != -1)
return has_kexec;
#endif
if(access("/proc/config.gz", F_OK) >= 0)
if(has_kexec == -1)
{
char *cmd_cp[] = { busybox_path, "cp", "/proc/config.gz", "/ikconfig.gz", NULL };
run_cmd(cmd_cp);
char *cmd_gzip[] = { busybox_path, "gzip", "-d", "/ikconfig.gz", NULL };
run_cmd(cmd_gzip);
has_kexec = 1;
uint32_t i;
static const char *checks[] = {
"CONFIG_KEXEC_HARDBOOT=y",
#ifndef MR_KEXEC_DTB
"CONFIG_ATAGS_PROC=y",
#else
"CONFIG_PROC_DEVICETREE=y",
#endif
};
// 0 1 2 3
char *cmd_grep[] = { busybox_path, "grep", NULL, "/ikconfig", NULL };
for(i = 0; i < ARRAY_SIZE(checks); ++i)
if(access("/proc/config.gz", F_OK) >= 0)
{
cmd_grep[2] = (char*)checks[i];
if(run_cmd(cmd_grep) != 0)
char *cmd_cp[] = { busybox_path, "cp", "/proc/config.gz", "/ikconfig.gz", NULL };
run_cmd(cmd_cp);
char *cmd_gzip[] = { busybox_path, "gzip", "-d", "/ikconfig.gz", NULL };
run_cmd(cmd_gzip);
has_kexec = 1;
uint32_t i;
static const char *checks[] = {
"CONFIG_KEXEC_HARDBOOT=y",
#ifndef MR_KEXEC_DTB
"CONFIG_ATAGS_PROC=y",
#else
"CONFIG_PROC_DEVICETREE=y",
#endif
};
// 0 1 2 3
char *cmd_grep[] = { busybox_path, "grep", NULL, "/ikconfig", NULL };
for(i = 0; i < ARRAY_SIZE(checks); ++i)
{
has_kexec = 0;
ERROR("%s not found in /proc/config.gz!\n", checks[i]);
cmd_grep[2] = (char*)checks[i];
if(run_cmd(cmd_grep) != 0)
{
has_kexec = 0;
ERROR("%s not found in /proc/config.gz!\n", checks[i]);
}
}
}
remove("/ikconfig");
}
else
{
// Kernel without /proc/config.gz enabled - check for /proc/atags file,
// if it is present, there is good change kexec-hardboot is enabled too.
ERROR("/proc/config.gz is not available!\n");
#ifndef MR_KEXEC_DTB
const char *checkfile = "/proc/atags";
#else
const char *checkfile = "/proc/device-tree";
#endif
if(access(checkfile, R_OK) < 0)
{
ERROR("%s was not found!\n", checkfile);
has_kexec = 0;
remove("/ikconfig");
}
else
has_kexec = 1;
{
// Kernel without /proc/config.gz enabled - check for /proc/atags file,
// if it is present, there is good change kexec-hardboot is enabled too.
ERROR("/proc/config.gz is not available!\n");
#ifndef MR_KEXEC_DTB
const char *checkfile = "/proc/atags";
#else
const char *checkfile = "/proc/device-tree";
#endif
if(access(checkfile, R_OK) < 0)
{
ERROR("%s was not found!\n", checkfile);
has_kexec = 0;
}
else
has_kexec = 1;
}
}
if(has_kexec && mr_system("%s -u", kexec_path) != 0)
{
ERROR("kexec -u test has failed, kernel doesn't have kexec-hardboot patch enabled in config!\n");
has_kexec = 0;
}
return has_kexec;