diff options
| author | Hari Bathini <hbathini@linux.ibm.com> | 2020-07-29 17:14:06 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-07-29 23:47:55 +1000 |
| commit | 2e6bd221d96fcfd9bd1eed5cd9c008e7959daed7 (patch) | |
| tree | aece224f682c4aeb57729b9a2866bed79ccaa823 /arch/powerpc/kexec | |
| parent | b5667d13be8d0928a02b46e0c6f7ab891d32f697 (diff) | |
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.c | 20 |
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; } |