When the kernel is built with CONFIG_PPC_EARLY_DEBUG_OPAL set, it is
expecting to get r8 and r9 filled respectively with OPAL base address and
OPAL entry address (arc/power/head_64.S).
On the new powernv platform, having these 2 registers set allows the kernel
to perform OPAL calls before it parse the device tree.
Signed-off-by: Laurent Dufour <ldufour at linux.vnet.ibm.com>
---
kexec/arch/ppc64/kexec-elf-ppc64.c | 43 ++++++++++++++++++++++++++++++++
purgatory/arch/ppc64/purgatory-ppc64.c | 2 +
purgatory/arch/ppc64/v2wrap.S | 4 +++
3 files changed, 49 insertions(+)
diff --git a/kexec/arch/ppc64/kexec-elf-ppc64.c b/kexec/arch/ppc64/kexec-elf-ppc64.c
index 7d49d8a..ce10367 100644
--- a/kexec/arch/ppc64/kexec-elf-ppc64.c
+++ b/kexec/arch/ppc64/kexec-elf-ppc64.c
@@ -71,6 +71,26 @@ void arch_reuse_initrd(void)
reuse_initrd = 1;
}
+static int read_prop(char *name, void *value, size_t len)
+{
+ int fd;
+ size_t rlen;
+
+ fd = open(name, O_RDONLY);
+ if (fd == -1)
+ return -1;
+
+ rlen = read(fd, value, len);
+ if (rlen < 0)
+ fprintf(stderr, "Warning : Can't read %s : %s",
+ name, strerror(errno));
+ else if (rlen != len)
+ fprintf(stderr, "Warning : short read from %s", name);
+
+ close(fd);
+ return 0;
+}
+
int elf_ppc64_load(int argc, char **argv, const char *buf, off_t len,
struct kexec_info *info)
{
@@ -90,6 +110,7 @@ int elf_ppc64_load(int argc, char **argv, const char *buf, off_t len,
int i;
int result, opt;
uint64_t my_kernel, my_dt_offset;
+ uint64_t my_opal_base = 0, my_opal_entry = 0;
unsigned int my_panic_kernel;
uint64_t my_stack, my_backup_start;
uint64_t toc_addr;
@@ -246,6 +267,20 @@ int elf_ppc64_load(int argc, char **argv, const char *buf, off_t len,
*rsvmap_ptr = cpu_to_be64((uint64_t)be32_to_cpu(bb_ptr->totalsize));
#endif
+ if (read_prop("/proc/device-tree/ibm,opal/opal-base-address",
+ &my_opal_base, sizeof(my_opal_base)) == 0) {
+ my_opal_base = be64_to_cpu(my_opal_base);
+ elf_rel_set_symbol(&info->rhdr, "opal_base",
+ &my_opal_base, sizeof(my_opal_base));
+ }
+
+ if (read_prop("/proc/device-tree/ibm,opal/opal-entry-address",
+ &my_opal_entry, sizeof(my_opal_entry)) == 0) {
+ my_opal_entry = be64_to_cpu(my_opal_entry);
+ elf_rel_set_symbol(&info->rhdr, "opal_entry",
+ &my_opal_entry, sizeof(my_opal_entry));
+ }
+
/* Set kernel */
elf_rel_set_symbol(&info->rhdr, "kernel", &my_kernel, sizeof(my_kernel));
@@ -306,7 +341,13 @@ int elf_ppc64_load(int argc, char **argv, const char *buf, off_t len,
toc_addr = 0;
my_run_at_load = 0;
my_debug = 0;
+ my_opal_base = 0;
+ my_opal_entry = 0;
+ elf_rel_get_symbol(&info->rhdr, "opal_base", &my_opal_base,
+ sizeof(my_opal_base));
+ elf_rel_get_symbol(&info->rhdr, "opal_entry", &my_opal_entry,
+ sizeof(my_opal_entry));
elf_rel_get_symbol(&info->rhdr, "kernel", &my_kernel, sizeof(my_kernel));
elf_rel_get_symbol(&info->rhdr, "dt_offset", &my_dt_offset,
sizeof(my_dt_offset));
@@ -333,6 +374,8 @@ int elf_ppc64_load(int argc, char **argv, const char *buf, off_t len,
dbgprintf("toc_addr is %llx\n", (unsigned long long)toc_addr);
dbgprintf("purgatory size is %zu\n", purgatory_size);
dbgprintf("debug is %d\n", my_debug);
+ dbgprintf("opal_base is %llx\n", (unsigned long long) my_opal_base);
+ dbgprintf("opal_entry is %llx\n", (unsigned long long) my_opal_entry);
for (i = 0; i < info->nr_segments; i++)
fprintf(stderr, "segment[%d].mem:%p memsz:%zu\n", i,
diff --git a/purgatory/arch/ppc64/purgatory-ppc64.c b/purgatory/arch/ppc64/purgatory-ppc64.c
index 0b6d326..7248ac8 100644
--- a/purgatory/arch/ppc64/purgatory-ppc64.c
+++ b/purgatory/arch/ppc64/purgatory-ppc64.c
@@ -29,6 +29,8 @@ unsigned long dt_offset = 0;
unsigned long my_toc = 0;
unsigned long kernel = 0;
unsigned int debug = 0;
+unsigned long opal_base = 0;
+unsigned long opal_entry = 0;
void setup_arch(void)
{
diff --git a/purgatory/arch/ppc64/v2wrap.S b/purgatory/arch/ppc64/v2wrap.S
index 2761c14..6fc62e3 100644
--- a/purgatory/arch/ppc64/v2wrap.S
+++ b/purgatory/arch/ppc64/v2wrap.S
@@ -95,6 +95,10 @@ master:
blt 80f
stw 17,28(3) # save my cpu number as boot_cpu_phys
80:
+ LOADADDR(6,opal_base) # For OPAL early debug
+ ld 8,0(6) # load the OPAL base address in r8
+ LOADADDR(6,opal_entry) # For OPAL early debug
+ ld 9,0(6) # load the OPAL entry address in r9
LOADADDR(6,kernel)
ld 4,0(6) # load the kernel address
LOADADDR(6,run_at_load) # the load flag
