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/purgatory | |
| 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/purgatory')
| -rw-r--r-- | arch/powerpc/purgatory/trampoline_64.S | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/powerpc/purgatory/trampoline_64.S b/arch/powerpc/purgatory/trampoline_64.S index b567da56dde1..d956b8a35fd1 100644 --- a/arch/powerpc/purgatory/trampoline_64.S +++ b/arch/powerpc/purgatory/trampoline_64.S @@ -87,6 +87,10 @@ master: li %r4,28 STWX_BE %r17,%r3,%r4 /* Store my cpu as __be32 at byte 28 */ 1: + /* Load opal base and entry values in r8 & r9 respectively */ + ld %r8,(opal_base - 0b)(%r18) + ld %r9,(opal_entry - 0b)(%r18) + /* load the kernel address */ ld %r4,(kernel - 0b)(%r18) @@ -133,6 +137,18 @@ backup_start: .8byte 0x0 .size backup_start, . - backup_start + .balign 8 + .globl opal_base +opal_base: + .8byte 0x0 + .size opal_base, . - opal_base + + .balign 8 + .globl opal_entry +opal_entry: + .8byte 0x0 + .size opal_entry, . - opal_entry + .data .balign 8 .globl purgatory_sha256_digest |