[PATCH 2/5] powerpc: dtb and purgatory support for ppc32
Sebastian Andrzej Siewior
sebastian at breakpoint.cc
Tue Jan 19 17:59:42 EST 2010
From: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
Some code dtb scanning & filling has been borrowed from ppc64.
The old behavior is still available if compiled with GameCube,
other PowerPC platform use the can purgatory and specify a new
dtb.
Booting a self contained elf image (incl. dtb / without the need
for a bd sturct or the like) can be booted. The dtb support is currently
optional. That means if the elf image does not contain a dtb file then
the user has to supply a complete dtb (including mem size, command line,
bus freq., mac addr, ...)
Signed-off-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
---
kexec/arch/ppc/kexec-elf-ppc.c | 108 +++++++---
kexec/arch/ppc/kexec-elf-rel-ppc.c | 4 +
kexec/arch/ppc/kexec-ppc.c | 447 +++++++++++++++++++++++++++++++++++-
kexec/arch/ppc/kexec-ppc.h | 7 +
purgatory/arch/ppc/Makefile | 1 +
purgatory/arch/ppc/purgatory-ppc.c | 6 +
purgatory/arch/ppc/v2wrap.S | 66 ++++++
7 files changed, 608 insertions(+), 31 deletions(-)
create mode 100644 purgatory/arch/ppc/v2wrap.S
diff --git a/kexec/arch/ppc/kexec-elf-ppc.c b/kexec/arch/ppc/kexec-elf-ppc.c
index 530e501..03b8a94 100644
--- a/kexec/arch/ppc/kexec-elf-ppc.c
+++ b/kexec/arch/ppc/kexec-elf-ppc.c
@@ -91,16 +91,6 @@ int elf_ppc_probe(const char *buf, off_t len)
return result;
}
-void elf_ppc_usage(void)
-{
- printf
- (
- " --command-line=STRING Set the kernel command line to STRING.\n"
- " --append=STRING Set the kernel command line to STRING.\n"
- " --gamecube=1|0 Enable/disable support for ELFs with changed\n"
- " addresses suitable for the GameCube.\n");
-}
-
static void gamecube_hack_addresses(struct mem_ehdr *ehdr)
{
struct mem_phdr *phdr, *phdr_end;
@@ -122,39 +112,56 @@ static void gamecube_hack_addresses(struct mem_ehdr *ehdr)
}
}
+#define OPT_APPEND (OPT_ARCH_MAX+0)
+#define OPT_GAMECUBE (OPT_ARCH_MAX+1)
+#define OPT_DTB (OPT_ARCH_MAX+2)
+static const struct option options[] = {
+ KEXEC_ARCH_OPTIONS
+ {"command-line", 1, 0, OPT_APPEND},
+ {"append", 1, 0, OPT_APPEND},
+ {"gamecube", 1, 0, OPT_GAMECUBE},
+ {"dtb", 1, 0, OPT_DTB},
+ {0, 0, 0, 0},
+};
+static const char short_options[] = KEXEC_ARCH_OPT_STR "d";
+
+void elf_ppc_usage(void)
+{
+ printf(
+ " --command-line=STRING Set the kernel command line to STRING.\n"
+ " --append=STRING Set the kernel command line to STRING.\n"
+ " --gamecube=1|0 Enable/disable support for ELFs with changed\n"
+ " addresses suitable for the GameCube.\n"
+ " --dtb=<filename> Specify device tree blob file.\n"
+ );
+}
+
int elf_ppc_load(int argc, char **argv, const char *buf, off_t len,
struct kexec_info *info)
{
struct mem_ehdr ehdr;
+ char *command_line;
+ int command_line_len;
+ char *dtb;
+ int result;
+#ifdef WITH_GAMECUBE
+ int target_is_gamecube = 1;
char *arg_buf;
size_t arg_bytes;
unsigned long arg_base;
struct boot_notes *notes;
size_t note_bytes;
- const char *command_line;
- int command_line_len;
unsigned char *setup_start;
uint32_t setup_size;
- int result;
-#ifdef WITH_GAMECUBE
- int target_is_gamecube = 1;
#else
int target_is_gamecube = 0;
+ unsigned int addr;
+ unsigned long dtb_addr;
#endif
int opt;
-#define OPT_APPEND (OPT_ARCH_MAX+0)
-#define OPT_GAMECUBE (OPT_ARCH_MAX+1)
- static const struct option options[] = {
- KEXEC_ARCH_OPTIONS
- {"command-line", 1, 0, OPT_APPEND},
- {"append", 1, 0, OPT_APPEND},
- {"gamecube", 1, 0, OPT_GAMECUBE},
- {0, 0, 0, 0},
- };
- static const char short_options[] = KEXEC_ARCH_OPT_STR "d";
-
- command_line = 0;
+ command_line = NULL;
+ dtb = NULL;
while ((opt = getopt_long(argc, argv, short_options, options, 0)) != -1) {
switch (opt) {
default:
@@ -171,6 +178,10 @@ int elf_ppc_load(int argc, char **argv, const char *buf, off_t len,
case OPT_GAMECUBE:
target_is_gamecube = atoi(optarg);
break;
+
+ case OPT_DTB:
+ dtb = optarg;
+ break;
}
}
command_line_len = 0;
@@ -194,6 +205,12 @@ int elf_ppc_load(int argc, char **argv, const char *buf, off_t len,
return result;
}
+ /*
+ * In case of a toy we take the hardcoded things and an easy setup via
+ * one of the assembly startups. Every thing else should be grown up
+ * and go through the purgatory.
+ */
+#ifdef WITH_GAMECUBE
if (target_is_gamecube) {
setup_start = setup_dol_start;
setup_size = setup_dol_size;
@@ -220,5 +237,42 @@ int elf_ppc_load(int argc, char **argv, const char *buf, off_t len,
notes->hdr.b_checksum = compute_ip_checksum(notes, note_bytes);
info->entry = (void *)arg_base;
+#else
+ elf_rel_build_load(info, &info->rhdr, (const char *)purgatory,
+ purgatory_size, 0, elf_max_addr(&ehdr), 1, 0);
+
+ if (dtb) {
+ char *blob_buf;
+ off_t blob_size = 0;
+
+ /* Grab device tree from buffer */
+ blob_buf = slurp_file(dtb, &blob_size);
+ dtb_addr = add_buffer(info, blob_buf, blob_size, blob_size, 0, 0,
+ KERNEL_ACCESS_TOP, -1);
+ if (command_line)
+ die("Don't consider command line because dtb is supplied\n");
+ } else {
+ die("Missing dtb.\n");
+ }
+
+ /* set various variables for the purgatory */
+ addr = ehdr.e_entry;
+ elf_rel_set_symbol(&info->rhdr, "kernel", &addr, sizeof(addr));
+
+ addr = dtb_addr;
+ elf_rel_set_symbol(&info->rhdr, "dt_offset", &addr, sizeof(addr));
+
+ addr = rmo_top;
+ elf_rel_set_symbol(&info->rhdr, "mem_size", &addr, sizeof(addr));
+
+#define PUL_STACK_SIZE (16 * 1024)
+ addr = locate_hole(info, PUL_STACK_SIZE, 0, 0, elf_max_addr(&ehdr), 1);
+ addr += PUL_STACK_SIZE;
+ elf_rel_set_symbol(&info->rhdr, "pul_stack", &addr, sizeof(addr));
+#undef PUL_STACK_SIZE
+
+ addr = elf_rel_get_addr(&info->rhdr, "purgatory_start");
+ info->entry = (void *)addr;
+#endif
return 0;
}
diff --git a/kexec/arch/ppc/kexec-elf-rel-ppc.c b/kexec/arch/ppc/kexec-elf-rel-ppc.c
index e711f3b..9a66bed 100644
--- a/kexec/arch/ppc/kexec-elf-rel-ppc.c
+++ b/kexec/arch/ppc/kexec-elf-rel-ppc.c
@@ -31,6 +31,10 @@ void machine_apply_elf_rel(struct mem_ehdr *ehdr, unsigned long r_type,
*(uint16_t *)location = value;
break;
+ case R_PPC_ADDR16_HI:
+ *(uint16_t *)location = (value>>16) & 0xffff;
+ break;
+
case R_PPC_ADDR16_HA:
/* Sign-adjusted lower 16 bits: PPC ELF ABI says:
(((x >> 16) + ((x & 0x8000) ? 1 : 0))) & 0xFFFF.
diff --git a/kexec/arch/ppc/kexec-ppc.c b/kexec/arch/ppc/kexec-ppc.c
index ef4fe35..ef22c3d 100644
--- a/kexec/arch/ppc/kexec-ppc.c
+++ b/kexec/arch/ppc/kexec-ppc.c
@@ -12,6 +12,12 @@
#include <stdint.h>
#include <string.h>
#include <getopt.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
#include "../../kexec.h"
#include "../../kexec-syscall.h"
#include "kexec-ppc.h"
@@ -19,14 +25,13 @@
#include "config.h"
+#ifdef WITH_GAMECUBE
#define MAX_MEMORY_RANGES 64
static struct memory_range memory_range[MAX_MEMORY_RANGES];
-/* Return a sorted list of memory ranges. */
-int get_memory_ranges(struct memory_range **range, int *ranges,
+static int get_memory_ranges_gc(struct memory_range **range, int *ranges,
unsigned long kexec_flags)
{
-#ifdef WITH_GAMECUBE
int memory_ranges = 0;
/* RAM - lowmem used by DOLs - framebuffer */
@@ -37,9 +42,443 @@ int get_memory_ranges(struct memory_range **range, int *ranges,
*range = memory_range;
*ranges = memory_ranges;
return 0;
+}
#else
- fprintf(stderr, "%s(): Unsupported platform\n", __func__);
+static int use_new_dtb;
+static int max_memory_ranges;
+static int nr_memory_ranges, nr_exclude_ranges;
+static struct memory_range *exclude_range;
+static struct memory_range *memory_range;
+static struct memory_range *base_memory_range;
+static uint64_t memory_max;
+uint64_t rmo_top;
+unsigned int rtas_base, rtas_size;
+
+/*
+ * Count the memory nodes under /proc/device-tree and populate the
+ * max_memory_ranges variable. This variable replaces MAX_MEMORY_RANGES
+ * macro used earlier.
+ */
+static int count_memory_ranges(void)
+{
+ char device_tree[256] = "/proc/device-tree/";
+ struct dirent *dentry;
+ DIR *dir;
+
+ if ((dir = opendir(device_tree)) == NULL) {
+ perror(device_tree);
+ return -1;
+ }
+
+ while ((dentry = readdir(dir)) != NULL) {
+ if (strncmp(dentry->d_name, "memory@", 7) &&
+ strcmp(dentry->d_name, "memory"))
+ continue;
+ max_memory_ranges++;
+ }
+
+ /* need to add extra region for retained initrd */
+ if (use_new_dtb) {
+ max_memory_ranges++;
+ }
+
+ closedir(dir);
+ return 0;
+
+}
+
+ static void cleanup_memory_ranges(void)
+ {
+ free(memory_range);
+ free(base_memory_range);
+ free(exclude_range);
+ }
+
+/*
+ * Allocate memory for various data structures used to hold
+ * values of different memory ranges
+ */
+static int alloc_memory_ranges(void)
+{
+ int memory_range_len;
+
+ memory_range_len = sizeof(struct memory_range) * max_memory_ranges;
+
+ memory_range = malloc(memory_range_len);
+ if (!memory_range)
+ return -1;
+
+ base_memory_range = malloc(memory_range_len);
+ if (!base_memory_range)
+ goto err1;
+
+ exclude_range = malloc(memory_range_len);
+ if (!exclude_range)
+ goto err1;
+
+ memset(memory_range, 0, memory_range_len);
+ memset(base_memory_range, 0, memory_range_len);
+ memset(exclude_range, 0, memory_range_len);
+ return 0;
+
+err1:
+ fprintf(stderr, "memory range structure allocation failure\n");
+ cleanup_memory_ranges();
return -1;
+}
+
+/* Sort the exclude ranges in memory */
+static int sort_ranges(void)
+{
+ int i, j;
+ uint64_t tstart, tend;
+ for (i = 0; i < nr_exclude_ranges - 1; i++) {
+ for (j = 0; j < nr_exclude_ranges - i - 1; j++) {
+ if (exclude_range[j].start > exclude_range[j+1].start) {
+ tstart = exclude_range[j].start;
+ tend = exclude_range[j].end;
+ exclude_range[j].start = exclude_range[j+1].start;
+ exclude_range[j].end = exclude_range[j+1].end;
+ exclude_range[j+1].start = tstart;
+ exclude_range[j+1].end = tend;
+ }
+ }
+ }
+ return 0;
+}
+
+/* Sort the base ranges in memory - this is useful for ensuring that our
+ * ranges are in ascending order, even if device-tree read of memory nodes
+ * is done differently. Also, could be used for other range coalescing later
+ */
+static int sort_base_ranges(void)
+{
+ int i, j;
+ unsigned long long tstart, tend;
+
+ for (i = 0; i < nr_memory_ranges - 1; i++) {
+ for (j = 0; j < nr_memory_ranges - i - 1; j++) {
+ if (base_memory_range[j].start > base_memory_range[j+1].start) {
+ tstart = base_memory_range[j].start;
+ tend = base_memory_range[j].end;
+ base_memory_range[j].start = base_memory_range[j+1].start;
+ base_memory_range[j].end = base_memory_range[j+1].end;
+ base_memory_range[j+1].start = tstart;
+ base_memory_range[j+1].end = tend;
+ }
+ }
+ }
+ return 0;
+}
+
+
+#define MAXBYTES 128
+
+/* Get base memory ranges */
+static int get_base_ranges(void)
+{
+ int local_memory_ranges = 0;
+ char device_tree[256] = "/proc/device-tree/";
+ char fname[256];
+ char buf[MAXBYTES];
+ DIR *dir, *dmem;
+ FILE *file;
+ struct dirent *dentry, *mentry;
+ int n;
+
+ if ((dir = opendir(device_tree)) == NULL) {
+ perror(device_tree);
+ return -1;
+ }
+ while ((dentry = readdir(dir)) != NULL) {
+ if (strncmp(dentry->d_name, "memory@", 7) &&
+ strcmp(dentry->d_name, "memory"))
+ continue;
+ strcpy(fname, device_tree);
+ strcat(fname, dentry->d_name);
+ if ((dmem = opendir(fname)) == NULL) {
+ perror(fname);
+ closedir(dir);
+ return -1;
+ }
+ while ((mentry = readdir(dmem)) != NULL) {
+ if (strcmp(mentry->d_name, "reg"))
+ continue;
+ strcat(fname, "/reg");
+ if ((file = fopen(fname, "r")) == NULL) {
+ perror(fname);
+ closedir(dmem);
+ closedir(dir);
+ return -1;
+ }
+ if ((n = fread(buf, 1, MAXBYTES, file)) < 0) {
+ perror(fname);
+ fclose(file);
+ closedir(dmem);
+ closedir(dir);
+ return -1;
+ }
+ if (local_memory_ranges >= max_memory_ranges) {
+ fclose(file);
+ break;
+ }
+ base_memory_range[local_memory_ranges].start =
+ ((uint32_t *)buf)[0];
+ base_memory_range[local_memory_ranges].end =
+ base_memory_range[local_memory_ranges].start +
+ ((uint32_t *)buf)[1];
+ base_memory_range[local_memory_ranges].type = RANGE_RAM;
+ local_memory_ranges++;
+ dbgprintf("%016llx-%016llx : %x\n",
+ base_memory_range[local_memory_ranges-1].start,
+ base_memory_range[local_memory_ranges-1].end,
+ base_memory_range[local_memory_ranges-1].type);
+ fclose(file);
+ }
+ closedir(dmem);
+ }
+ closedir(dir);
+ nr_memory_ranges = local_memory_ranges;
+ sort_base_ranges();
+ memory_max = base_memory_range[nr_memory_ranges - 1].end;
+#ifdef DEBUG
+ fprintf(stderr, "get base memory ranges:%d\n", nr_memory_ranges);
+#endif
+ return 0;
+}
+
+/* Get devtree details and create exclude_range array
+ * Also create usablemem_ranges for KEXEC_ON_CRASH
+ */
+static int get_devtree_details(unsigned long kexec_flags)
+{
+ uint64_t rmo_base;
+ char buf[MAXBYTES];
+ char device_tree[256] = "/proc/device-tree/";
+ char fname[256];
+ DIR *dir, *cdir;
+ FILE *file;
+ struct dirent *dentry;
+ int n, i = 0;
+
+ if ((dir = opendir(device_tree)) == NULL) {
+ perror(device_tree);
+ return -1;
+ }
+
+ while ((dentry = readdir(dir)) != NULL) {
+ if (strncmp(dentry->d_name, "chosen", 6) &&
+ strncmp(dentry->d_name, "memory@", 7) &&
+ strcmp(dentry->d_name, "memory") &&
+ strncmp(dentry->d_name, "rtas", 4))
+ continue;
+
+ strcpy(fname, device_tree);
+ strcat(fname, dentry->d_name);
+ if ((cdir = opendir(fname)) == NULL) {
+ perror(fname);
+ goto error_opendir;
+ }
+
+ if (strncmp(dentry->d_name, "rtas", 4) == 0) {
+ strcat(fname, "/linux,rtas-base");
+ if ((file = fopen(fname, "r")) == NULL) {
+ perror(fname);
+ goto error_opencdir;
+ }
+ if (fread(&rtas_base, sizeof(unsigned int), 1, file) != 1) {
+ perror(fname);
+ goto error_openfile;
+ }
+ memset(fname, 0, sizeof(fname));
+ strcpy(fname, device_tree);
+ strcat(fname, dentry->d_name);
+ strcat(fname, "/rtas-size");
+ if ((file = fopen(fname, "r")) == NULL) {
+ perror(fname);
+ goto error_opencdir;
+ }
+ if (fread(&rtas_size, sizeof(unsigned int), 1, file) != 1) {
+ perror(fname);
+ goto error_openfile;
+ }
+ closedir(cdir);
+ /* Add rtas to exclude_range */
+ exclude_range[i].start = rtas_base;
+ exclude_range[i].end = rtas_base + rtas_size;
+ i++;
+ } /* rtas */
+
+ if (!strncmp(dentry->d_name, "memory@", 7) ||
+ !strcmp(dentry->d_name, "memory")) {
+ strcat(fname, "/reg");
+ if ((file = fopen(fname, "r")) == NULL) {
+ perror(fname);
+ goto error_opencdir;
+ }
+ if ((n = fread(buf, 1, MAXBYTES, file)) < 0) {
+ perror(fname);
+ goto error_openfile;
+ }
+ if (n == 8) {
+ rmo_base = ((uint32_t *)buf)[0];
+ rmo_top = rmo_base + ((uint32_t *)buf)[1];
+ } else if (n == 16) {
+ rmo_base = ((uint64_t *)buf)[0];
+ rmo_top = rmo_base + ((uint64_t *)buf)[1];
+ } else {
+ fprintf(stderr, "Mem node has invalid size: %d\n", n);
+ goto error_openfile;
+ }
+ if (rmo_top > 0x30000000UL)
+ rmo_top = 0x30000000UL;
+
+ fclose(file);
+ closedir(cdir);
+ } /* memory */
+ }
+ closedir(dir);
+
+ nr_exclude_ranges = i;
+
+ sort_ranges();
+
+#ifdef DEBUG
+ int k;
+ for (k = 0; k < i; k++)
+ fprintf(stderr, "exclude_range sorted exclude_range[%d] "
+ "start:%llx, end:%llx\n", k, exclude_range[k].start,
+ exclude_range[k].end);
+#endif
+ return 0;
+
+error_openfile:
+ fclose(file);
+error_opencdir:
+ closedir(cdir);
+error_opendir:
+ closedir(dir);
+ return -1;
+}
+
+
+/* Setup a sorted list of memory ranges. */
+static int setup_memory_ranges(unsigned long kexec_flags)
+{
+ int i, j = 0;
+
+ /* Get the base list of memory ranges from /proc/device-tree/memory
+ * nodes. Build list of ranges to be excluded from valid memory
+ */
+
+ if (get_base_ranges())
+ goto out;
+ if (get_devtree_details(kexec_flags))
+ goto out;
+
+ for (i = 0; i < nr_exclude_ranges; i++) {
+ /* If first exclude range does not start with 0, include the
+ * first hole of valid memory from 0 - exclude_range[0].start
+ */
+ if (i == 0) {
+ if (exclude_range[i].start != 0) {
+ memory_range[j].start = 0;
+ memory_range[j].end = exclude_range[i].start - 1;
+ memory_range[j].type = RANGE_RAM;
+ j++;
+ }
+ } /* i == 0 */
+ /* If the last exclude range does not end at memory_max, include
+ * the last hole of valid memory from exclude_range[last].end -
+ * memory_max
+ */
+ if (i == nr_exclude_ranges - 1) {
+ if (exclude_range[i].end < memory_max) {
+ memory_range[j].start = exclude_range[i].end + 1;
+ memory_range[j].end = memory_max;
+ memory_range[j].type = RANGE_RAM;
+ j++;
+ /* Limit the end to rmo_top */
+ if (memory_range[j-1].start >= rmo_top) {
+ j--;
+ break;
+ }
+ if ((memory_range[j-1].start < rmo_top) &&
+ (memory_range[j-1].end >= rmo_top)) {
+ memory_range[j-1].end = rmo_top;
+ break;
+ }
+ continue;
+ }
+ } /* i == nr_exclude_ranges - 1 */
+ /* contiguous exclude ranges - skip */
+ if (exclude_range[i+1].start == exclude_range[i].end + 1)
+ continue;
+ memory_range[j].start = exclude_range[i].end + 1;
+ memory_range[j].end = exclude_range[i+1].start - 1;
+ memory_range[j].type = RANGE_RAM;
+ j++;
+ /* Limit range to rmo_top */
+ if (memory_range[j-1].start >= rmo_top) {
+ j--;
+ break;
+ }
+ if ((memory_range[j-1].start < rmo_top) &&
+ (memory_range[j-1].end >= rmo_top)) {
+ memory_range[j-1].end = rmo_top;
+ break;
+ }
+ }
+
+ /* fixup in case we have no exclude regions */
+ if (!j) {
+ memory_range[0].start = base_memory_range[0].start;
+ memory_range[0].end = rmo_top;
+ memory_range[0].type = RANGE_RAM;
+ nr_memory_ranges = 1;
+ } else
+ nr_memory_ranges = j;
+
+#ifdef DEBUG
+ int k;
+ for (k = 0; k < j; k++)
+ fprintf(stderr, "setup_memory_ranges memory_range[%d] "
+ "start:%llx, end:%llx\n", k, memory_range[k].start,
+ memory_range[k].end);
+#endif
+ return 0;
+
+out:
+ cleanup_memory_ranges();
+ return -1;
+}
+
+
+/* Return a list of valid memory ranges */
+int get_memory_ranges_dt(struct memory_range **range, int *ranges,
+ unsigned long kexec_flags)
+{
+ if (count_memory_ranges())
+ return -1;
+ if (alloc_memory_ranges())
+ return -1;
+ if (setup_memory_ranges(kexec_flags))
+ return -1;
+
+ *range = memory_range;
+ *ranges = nr_memory_ranges;
+ return 0;
+}
+#endif
+
+/* Return a sorted list of memory ranges. */
+int get_memory_ranges(struct memory_range **range, int *ranges,
+ unsigned long kexec_flags)
+{
+#ifdef WITH_GAMECUBE
+ return get_memory_ranges_gc(range, ranges, kexec_flags);
+#else
+ return get_memory_ranges_dt(range, ranges, kexec_flags);
#endif
}
diff --git a/kexec/arch/ppc/kexec-ppc.h b/kexec/arch/ppc/kexec-ppc.h
index 6a40cc8..1b2b015 100644
--- a/kexec/arch/ppc/kexec-ppc.h
+++ b/kexec/arch/ppc/kexec-ppc.h
@@ -10,6 +10,7 @@ extern struct {
extern unsigned char setup_dol_start[];
extern uint32_t setup_dol_size;
+extern uint64_t rmo_top;
extern struct {
uint32_t spr8;
@@ -25,4 +26,10 @@ int dol_ppc_load(int argc, char **argv, const char *buf, off_t len,
struct kexec_info *info);
void dol_ppc_usage(void);
+/*
+ * During inital setup the kernel does not map the whole memory but a part of
+ * it. On Book-E that is 64MiB, 601 24MiB or 256MiB (if possible).
+ */
+#define KERNEL_ACCESS_TOP (24 * 1024 * 1024)
+
#endif /* KEXEC_PPC_H */
diff --git a/purgatory/arch/ppc/Makefile b/purgatory/arch/ppc/Makefile
index 69fd46c..0dd18b6 100644
--- a/purgatory/arch/ppc/Makefile
+++ b/purgatory/arch/ppc/Makefile
@@ -2,6 +2,7 @@
# Purgatory ppc
#
+ppc_PURGATORY_SRCS += purgatory/arch/ppc/v2wrap.S
ppc_PURGATORY_SRCS += purgatory/arch/ppc/misc.S
ppc_PURGATORY_SRCS += purgatory/arch/ppc/purgatory-ppc.c
ppc_PURGATORY_SRCS += purgatory/arch/ppc/console-ppc.c
diff --git a/purgatory/arch/ppc/purgatory-ppc.c b/purgatory/arch/ppc/purgatory-ppc.c
index 077f495..01d0f38 100644
--- a/purgatory/arch/ppc/purgatory-ppc.c
+++ b/purgatory/arch/ppc/purgatory-ppc.c
@@ -1,6 +1,12 @@
#include <purgatory.h>
#include "purgatory-ppc.h"
+unsigned int pul_stack = 0;
+unsigned int dt_offset = 0;
+unsigned int kernel = 0;
+unsigned int epapr_magic = 0;
+unsigned int mem_size = 0;
+
void setup_arch(void)
{
/* Nothing for now */
diff --git a/purgatory/arch/ppc/v2wrap.S b/purgatory/arch/ppc/v2wrap.S
new file mode 100644
index 0000000..79d188f
--- /dev/null
+++ b/purgatory/arch/ppc/v2wrap.S
@@ -0,0 +1,66 @@
+#
+# kexec: Linux boots Linux
+#
+# Copyright (C) 2004 - 2005, Milton D Miller II, IBM Corporation
+# Copyright (C) 2006, Mohan Kumar M (mohan at in.ibm.com), IBM Corporation
+# Copyright (C) 2008, Sebastian Andrzej Siewior (bigeasy at linutronix.de), linutronix
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation (version 2 of the License).
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+#
+
+#include "ppc_asm.h"
+
+# v2wrap.S
+# a wrapper to call purgatory code
+# Invokes ppc kernel with the arguments according to ePAPR v1.0
+# It assumes that the MSR is allready correct.
+
+# calling convention:
+# no register are considred
+#
+
+#define LOADADDR(rn,name) \
+ lis rn,name##@h; \
+ ori rn,rn,name##@l; \
+
+ .globl purgatory_start
+purgatory_start:
+
+ LOADADDR(r6,pul_stack)
+ lwz r1,0(r6) #setup stack
+
+ subi r1, r1, 112
+ bl purgatory
+ nop
+
+ LOADADDR(r6,kernel)
+ lwz r4,0(r6) # load the kernel address
+ mtlr r4 # prepare branch too
+
+ LOADADDR(r6, dt_offset)
+ lwz r3, 0(r6) # load device-tree address
+
+ li r4, 0
+ li r5, 0
+
+ LOADADDR(r6, epapr_magic) # ePAPR magic value
+ lwz r6, 0(r6)
+
+ LOADADDR(r7, mem_size) # the Initial Mapped Area
+ lwz r7, 0(r6)
+
+ li r8, 0
+ li r9, 0
+
+ blr # start kernel
--
1.6.5.2
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