diff options
| author |  Nicholas Piggin <npiggin@gmail.com>
| 2023-02-03 21:38:57 +1000 |
|---|---|---|
| committer |  Michael Ellerman <mpe@ellerman.id.au>
| 2023-02-10 22:17:36 +1100 |
| commit | 58f24eea5278cb6078552e16063fdd8b0a1b9676 (patch) | |
| tree | be1267af2bc43a1cc2974df26bd5539331127b22 /arch | |
| parent | crypto: powerpc - Use address generation helper for asm (diff) | |
| download | linux-58f24eea5278.tar.gz linux-58f24eea5278.tar.bz2 linux-58f24eea5278.zip | |
powerpc/64s: Refactor initialisation after prom
Move some basic Book3S initialisation after prom to a function similar
to what Book3E looks like. Book3E returns from this function at the
virtual address mapping, and Book3S will do the same in a later change,
so making them look similar helps with that.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230203113858.1152093-3-npiggin@gmail.com
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/head_64.S | 44 |
1 files changed, 25 insertions, 19 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index 7558ba4eb864..5af2e473b195 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -475,8 +475,30 @@ SYM_FUNC_START_LOCAL(__mmu_off) rfid b . /* prevent speculative execution */ SYM_FUNC_END(__mmu_off) -#endif +start_initialization_book3s: + mflr r25 + + /* Setup some critical 970 SPRs before switching MMU off */ + mfspr r0,SPRN_PVR + srwi r0,r0,16 + cmpwi r0,0x39 /* 970 */ + beq 1f + cmpwi r0,0x3c /* 970FX */ + beq 1f + cmpwi r0,0x44 /* 970MP */ + beq 1f + cmpwi r0,0x45 /* 970GX */ + bne 2f +1: bl __cpu_preinit_ppc970 +2: + + /* Switch off MMU if not already off */ + bl __mmu_off + + mtlr r25 + blr +#endif /* * Here is our main kernel entry point. We support currently 2 kind of entries @@ -523,26 +545,10 @@ __start_initialization_multiplatform: #ifdef CONFIG_PPC_BOOK3E_64 bl start_initialization_book3e - b __after_prom_start #else - /* Setup some critical 970 SPRs before switching MMU off */ - mfspr r0,SPRN_PVR - srwi r0,r0,16 - cmpwi r0,0x39 /* 970 */ - beq 1f - cmpwi r0,0x3c /* 970FX */ - beq 1f - cmpwi r0,0x44 /* 970MP */ - beq 1f - cmpwi r0,0x45 /* 970GX */ - bne 2f -1: bl __cpu_preinit_ppc970 -2: - - /* Switch off MMU if not already off */ - bl __mmu_off - b __after_prom_start + bl start_initialization_book3s #endif /* CONFIG_PPC_BOOK3E_64 */ + b __after_prom_start __REF __boot_from_prom: |