From 4f18b9e6ca58440394e86a53bf1be0d8a1920bcd Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Sat, 8 Apr 2023 12:17:47 +1000 Subject: [PATCH] powerpc/64: Move initial base and TOC pointer calculation A later change moves the non-prom case to run at the virtual address earlier, which calls for virtual TOC and kernel base. Split these two calculations for prom and non-prom to make that change simpler. Signed-off-by: Nicholas Piggin [mpe: Retain relative_toc call for start_initialization_book3e] Signed-off-by: Michael Ellerman Link: https://msgid.link/20230408021752.862660-2-npiggin@gmail.com --- arch/powerpc/kernel/head_64.S | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index 1febb56..00ac592 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -515,15 +515,6 @@ __start_initialization_multiplatform: /* Zero r13 (paca) so early program check / mce don't use it */ li r13,0 - /* Get TOC pointer (current runtime address) */ - bl relative_toc - - /* find out where we are now */ - bcl 20,31,$+4 -0: mflr r26 /* r26 = runtime addr here */ - addis r26,r26,(_stext - 0b)@ha - addi r26,r26,(_stext - 0b)@l /* current runtime base addr */ - /* * Are we booted from a PROM Of-type client-interface ? */ @@ -540,16 +531,38 @@ __start_initialization_multiplatform: mr r29,r9 #endif + /* Get TOC pointer (current runtime address) */ + bl relative_toc + #ifdef CONFIG_PPC_BOOK3E_64 bl start_initialization_book3e #else bl start_initialization_book3s #endif /* CONFIG_PPC_BOOK3E_64 */ + + /* Get TOC pointer */ + bl relative_toc + + /* find out where we are now */ + bcl 20,31,$+4 +0: mflr r26 /* r26 = runtime addr here */ + addis r26,r26,(_stext - 0b)@ha + addi r26,r26,(_stext - 0b)@l /* current runtime base addr */ + b __after_prom_start __REF __boot_from_prom: #ifdef CONFIG_PPC_OF_BOOT_TRAMPOLINE + /* Get TOC pointer */ + bl relative_toc + + /* find out where we are now */ + bcl 20,31,$+4 +0: mflr r26 /* r26 = runtime addr here */ + addis r26,r26,(_stext - 0b)@ha + addi r26,r26,(_stext - 0b)@l /* current runtime base addr */ + /* Save parameters */ mr r31,r3 mr r30,r4 -- 2.7.4