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authorHari Bathini <hbathini@linux.ibm.com>2020-07-29 14:44:06 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2020-07-29 16:47:55 +0300
commit2e6bd221d96fcfd9bd1eed5cd9c008e7959daed7 (patch)
treeaece224f682c4aeb57729b9a2866bed79ccaa823 /arch/powerpc/kexec
parentb5667d13be8d0928a02b46e0c6f7ab891d32f697 (diff)
downloadlinux-2e6bd221d96fcfd9bd1eed5cd9c008e7959daed7.tar.xz
powerpc/kexec_file: Enable early kernel OPAL calls
Kernels built with CONFIG_PPC_EARLY_DEBUG_OPAL enabled expects r8 & r9 to be filled with OPAL base & entry addresses respectively. Setting these registers allows the kernel to perform OPAL calls before the device tree is parsed. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/159602303975.575379.5032301944162937479.stgit@hbathini
Diffstat (limited to 'arch/powerpc/kexec')
-rw-r--r--arch/powerpc/kexec/file_load_64.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index c6a37ad5a0a4..53bb71e3a2e1 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -876,6 +876,7 @@ int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
const void *fdt, unsigned long kernel_load_addr,
unsigned long fdt_load_addr)
{
+ struct device_node *dn = NULL;
int ret;
ret = setup_purgatory(image, slave_code, fdt, kernel_load_addr,
@@ -903,9 +904,28 @@ int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
&image->arch.backup_start,
sizeof(image->arch.backup_start),
false);
+ if (ret)
+ goto out;
+
+ /* Setup OPAL base & entry values */
+ dn = of_find_node_by_path("/ibm,opal");
+ if (dn) {
+ u64 val;
+
+ of_property_read_u64(dn, "opal-base-address", &val);
+ ret = kexec_purgatory_get_set_symbol(image, "opal_base", &val,
+ sizeof(val), false);
+ if (ret)
+ goto out;
+
+ of_property_read_u64(dn, "opal-entry-address", &val);
+ ret = kexec_purgatory_get_set_symbol(image, "opal_entry", &val,
+ sizeof(val), false);
+ }
out:
if (ret)
pr_err("Failed to setup purgatory symbols");
+ of_node_put(dn);
return ret;
}