[PATCH 2/2] kexec ppc64: Add arch specific --reuseinitrd hooks
Michael Neuling
mikey at neuling.org
Fri Apr 27 00:53:19 EDT 2007
Adds ppc64 specific hooks for the --reuseinitrd option.
Signed-off-by: Michael Neuling <mikey at neuling.org>
---
kexec/arch/ppc64/fs2dt.c | 30 +++++++++++-----
kexec/arch/ppc64/kexec-elf-ppc64.c | 12 +++++-
kexec/arch/ppc64/kexec-ppc64.c | 69 +++++++++++++++++++++++++++++++++++++
kexec/arch/ppc64/kexec-ppc64.h | 1
4 files changed, 103 insertions(+), 9 deletions(-)
Index: kexec-tools-testing/kexec/arch/ppc64/fs2dt.c
===================================================================
--- kexec-tools-testing.orig/kexec/arch/ppc64/fs2dt.c
+++ kexec-tools-testing/kexec/arch/ppc64/fs2dt.c
@@ -66,11 +66,11 @@ void reserve(unsigned long long where, u
}
/* look for properties we need to reserve memory space for */
-static void checkprop(char *name, unsigned *data)
+static void checkprop(char *name, unsigned *data, int len)
{
- static unsigned long long base, size;
+ static unsigned long long base, size, end;
- if ((data == NULL) && (base || size))
+ if ((data == NULL) && (base || size || end))
die("unrecoverable error: no property data");
else if (!strcmp(name, "linux,rtas-base"))
base = *data;
@@ -79,11 +79,24 @@ static void checkprop(char *name, unsign
else if (!strcmp(name, "rtas-size") ||
!strcmp(name, "linux,tce-size"))
size = *data;
+ else if (reuse_initrd && !strcmp(name, "linux,initrd-start"))
+ if (len == 8)
+ base = *(unsigned long long *) data;
+ else
+ base = *data;
+ else if (reuse_initrd && !strcmp(name, "linux,initrd-end"))
+ end = *(unsigned long long *) data;
+ if (size && end)
+ die("unrecoverable error: size and end set at same time\n");
if (base && size) {
reserve(base, size);
base = size = 0;
}
+ if (base && end) {
+ reserve(base, end-base);
+ base = end = 0;
+ }
}
/*
@@ -213,10 +226,11 @@ static void putprops(char *fn, struct di
continue;
/* This property will be created/modified later in putnode()
- * So ignore it.
+ * So ignore it, unless we are reusing the initrd.
*/
- if (!strcmp(dp->d_name, "linux,initrd-start") ||
- !strcmp(dp->d_name, "linux,initrd-end"))
+ if ((!strcmp(dp->d_name, "linux,initrd-start") ||
+ !strcmp(dp->d_name, "linux,initrd-end")) &&
+ !reuse_initrd)
continue;
if (! S_ISREG(statbuf.st_mode))
@@ -241,7 +255,7 @@ static void putprops(char *fn, struct di
die("unrecoverable error: could not read \"%s\": %s\n",
pathname, strerror(errno));
- checkprop(fn, dt);
+ checkprop(fn, dt, len);
/* Get the cmdline from the device-tree and modify it */
if (!strcmp(dp->d_name, "bootargs")) {
@@ -282,7 +296,7 @@ static void putprops(char *fn, struct di
}
fn[0] = '\0';
- checkprop(pathname, NULL);
+ checkprop(pathname, NULL, 0);
}
/*
Index: kexec-tools-testing/kexec/arch/ppc64/kexec-elf-ppc64.c
===================================================================
--- kexec-tools-testing.orig/kexec/arch/ppc64/kexec-elf-ppc64.c
+++ kexec-tools-testing/kexec/arch/ppc64/kexec-elf-ppc64.c
@@ -43,6 +43,8 @@
#define BOOTLOADER_VERSION VERSION
unsigned long initrd_base, initrd_size;
+unsigned char reuse_initrd = 0;
+const char *ramdisk;
int create_flatten_tree(struct kexec_info *, unsigned char **, unsigned long *,
char *);
@@ -69,12 +71,17 @@ int elf_ppc64_probe(const char *buf, off
return result;
}
+void arch_reuse_initrd(void)
+{
+ reuse_initrd = 1;
+}
+
int elf_ppc64_load(int argc, char **argv, const char *buf, off_t len,
struct kexec_info *info)
{
struct mem_ehdr ehdr;
char *cmdline, *modified_cmdline;
- const char *ramdisk, *devicetreeblob;
+ const char *devicetreeblob;
int cmdline_len, modified_cmdline_len;
unsigned long long max_addr, hole_addr;
unsigned char *seg_buf = NULL;
@@ -148,6 +155,9 @@ int elf_ppc64_load(int argc, char **argv
else
fprintf(stdout, "Warning: append= option is not passed. Using the first kernel root partition\n");
+ if (ramdisk && reuse_initrd)
+ die("Can't specify --ramdisk or --initrd with --reuseinitrd\n");
+
setup_memory_ranges(info->kexec_flags);
/* Need to append some command line parameters internally in case of
Index: kexec-tools-testing/kexec/arch/ppc64/kexec-ppc64.c
===================================================================
--- kexec-tools-testing.orig/kexec/arch/ppc64/kexec-ppc64.c
+++ kexec-tools-testing/kexec/arch/ppc64/kexec-ppc64.c
@@ -122,6 +122,11 @@ static int count_memory_ranges()
continue;
max_memory_ranges++;
}
+ /* need to add extra region for retained initrd */
+ if (reuse_initrd) {
+ max_memory_ranges++;
+ }
+
closedir(dir);
return 0;
@@ -253,12 +258,14 @@ static int get_devtree_details(unsigned
unsigned int tce_size;
unsigned long long htab_base, htab_size;
unsigned long long kernel_end;
+ unsigned long long initrd_start, initrd_end;
char buf[MAXBYTES-1];
char device_tree[256] = "/proc/device-tree/";
char fname[256];
DIR *dir, *cdir;
FILE *file;
struct dirent *dentry;
+ struct stat *fstat = malloc(sizeof(struct stat));
int n, i = 0;
if ((dir = opendir(device_tree)) == NULL) {
@@ -394,6 +401,68 @@ static int get_devtree_details(unsigned
exclude_range[i].start = htab_base;
exclude_range[i].end = htab_base + htab_size;
i++;
+
+ /* reserve the initrd_start and end locations. */
+ if (reuse_initrd) {
+ memset(fname, 0, sizeof(fname));
+ strcpy(fname, device_tree);
+ strcat(fname, dentry->d_name);
+ strcat(fname, "/linux,initrd-start");
+ if ((file = fopen(fname, "r")) == NULL) {
+ perror(fname);
+ closedir(cdir);
+ closedir(dir);
+ return -1;
+ }
+ /* check for 4 and 8 byte initrd offset sizes */
+ if (stat(fname, fstat) != 0) {
+ perror(fname);
+ fclose(file);
+ closedir(cdir);
+ closedir(dir);
+ return -1;
+ }
+ if (fread(&initrd_start, fstat->st_size, 1, file) != 1) {
+ perror(fname);
+ fclose(file);
+ closedir(cdir);
+ closedir(dir);
+ return -1;
+ }
+ fclose(file);
+
+ memset(fname, 0, sizeof(fname));
+ strcpy(fname, device_tree);
+ strcat(fname, dentry->d_name);
+ strcat(fname, "/linux,initrd-end");
+ if ((file = fopen(fname, "r")) == NULL) {
+ perror(fname);
+ closedir(cdir);
+ closedir(dir);
+ return -1;
+ }
+ /* check for 4 and 8 byte initrd offset sizes */
+ if (stat(fname, fstat) != 0) {
+ perror(fname);
+ fclose(file);
+ closedir(cdir);
+ closedir(dir);
+ return -1;
+ }
+ if (fread(&initrd_end, fstat->st_size, 1, file) != 1) {
+ perror(fname);
+ fclose(file);
+ closedir(cdir);
+ closedir(dir);
+ return -1;
+ }
+ fclose(file);
+
+ /* Add initrd address to exclude_range */
+ exclude_range[i].start = initrd_start;
+ exclude_range[i].end = initrd_end;
+ i++;
+ }
} /* chosen */
if (strncmp(dentry->d_name, "rtas", 4) == 0) {
Index: kexec-tools-testing/kexec/arch/ppc64/kexec-ppc64.h
===================================================================
--- kexec-tools-testing.orig/kexec/arch/ppc64/kexec-ppc64.h
+++ kexec-tools-testing/kexec/arch/ppc64/kexec-ppc64.h
@@ -16,6 +16,7 @@ void reserve(unsigned long long where, u
extern unsigned long initrd_base, initrd_size;
extern int max_memory_ranges;
+extern unsigned char reuse_initrd;
/* boot block version 2 as defined by the linux kernel */
struct bootblock {
More information about the kexec
mailing list