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Subject[RFC PATCH v1 00/41] powerpc/32: Switch to interrupt entry/exit in C
This series aims at porting interrupt entry/exit in C on PPC32, using
the work already merged for PPC64.

First part do minimal changes in 40x in order to be able to enable MMU
earlier in exception entry.

Second part prepares and switches interrupt exit in C.

Third part moves more and more things in C, ending with KUAP management.

v1 is boot tested on 8xx and 83xx, releasing it as an RFC to get early feedback.

This series applies on top of the one switching ppc32 syscall entry/exit in C.

First patch is a bug fix already submitted but not yet merged that interracts with the series.

Christophe Leroy (41):
powerpc/32: Preserve cr1 in exception prolog stack check to fix build
powerpc/40x: Don't use SPRN_SPRG_SCRATCH0/1 in TLB miss handlers
powerpc/40x: Change CRITICAL_EXCEPTION_PROLOG macro to a gas macro
powerpc/40x: Save SRR0/SRR1 and r10/r11 earlier in critical exception
powerpc/40x: Reorder a few instructions in critical exception prolog
powerpc/40x: Prepare for enabling MMU in critical exception prolog
powerpc/40x: Prepare normal exception handler for enabling MMU early
powerpc/32: Reconcile interrupts in C
powerpc/32: Entry cpu time accounting in C
powerpc/32: Handle bookE debugging in C in exception entry
powerpc/32: Use fast instruction to set MSR RI in exception prolog on
powerpc/32: Remove ksp_limit
powerpc/32: Always enable data translation in exception prolog
powerpc/32: Tag DAR in EXCEPTION_PROLOG_2 for the 8xx
powerpc/32: Enable instruction translation at the same time as data
powerpc/32: Statically initialise first emergency context
powerpc/32: Add vmap_stack_overflow label inside the macro
powerpc/32: Use START_EXCEPTION() as much as possible
powerpc/32: Move exception prolog code into .text once MMU is back on
powerpc/32: Provide a name to exception prolog continuation in virtual
powerpc/32: Refactor booke critical registers saving
powerpc/32: Perform normal function call in exception entry
powerpc/32: Always save non volatile registers on exception entry
powerpc/32: Replace ASM exception exit by C exception exit from ppc64
powerpc/32: Set regs parameter in r3 in transfer_to_handler
powerpc/32: Remove handle_page_fault()
powerpc/32: Save trap number on stack in exception prolog
powerpc/32: Add a prepare_transfer_to_handler macro for exception
powerpc/32: Only restore non volatile registers when required
powerpc/32: Dismantle EXC_XFER_STD/LITE/TEMPLATE
powerpc/32: Remove the xfer parameter in EXCEPTION() macro
powerpc/32: Refactor saving of volatile registers in exception prologs
powerpc/32: Save remaining registers in exception prolog
powerpc/32: Set current->thread.regs in C interrupt entry
powerpc/32: Return directly from power_save_ppc32_restore()
powerpc/32: Only use prepare_transfer_to_handler function on book3s/32
and e500
powerpc/32s: Move KUEP locking/unlocking in C
powerpc/64s: Make kuap_check_amr() and kuap_get_and_check_amr()
powerpc/32s: Create C version of kuap save/restore/check helpers
powerpc/8xx: Create C version of kuap save/restore/check helpers
powerpc/32: Manage KUAP in C

arch/powerpc/include/asm/book3s/32/kup.h | 126 ++-
arch/powerpc/include/asm/book3s/64/kup.h | 24 +-
arch/powerpc/include/asm/interrupt.h | 21 +
arch/powerpc/include/asm/kup.h | 37 +-
arch/powerpc/include/asm/nohash/32/kup-8xx.h | 58 +-
arch/powerpc/include/asm/ppc_asm.h | 10 -
arch/powerpc/include/asm/processor.h | 6 +-
arch/powerpc/include/asm/ptrace.h | 13 +-
arch/powerpc/kernel/asm-offsets.c | 4 -
arch/powerpc/kernel/entry_32.S | 810 ++++---------------
arch/powerpc/kernel/fpu.S | 2 -
arch/powerpc/kernel/head_32.h | 197 ++---
arch/powerpc/kernel/head_40x.S | 271 ++++---
arch/powerpc/kernel/head_44x.S | 10 +-
arch/powerpc/kernel/head_8xx.S | 151 ++--
arch/powerpc/kernel/head_book3s_32.S | 239 +++---
arch/powerpc/kernel/head_booke.h | 188 +++--
arch/powerpc/kernel/head_fsl_booke.S | 64 +-
arch/powerpc/kernel/idle_6xx.S | 14 +-
arch/powerpc/kernel/idle_e500.S | 14 +-
arch/powerpc/kernel/interrupt.c | 35 +-
arch/powerpc/kernel/misc_32.S | 14 -
arch/powerpc/kernel/process.c | 6 +-
arch/powerpc/kernel/setup_32.c | 2 +-
arch/powerpc/kernel/traps.c | 9 -
arch/powerpc/kernel/vector.S | 2 -
arch/powerpc/lib/sstep.c | 9 -
arch/powerpc/mm/book3s32/Makefile | 1 +
arch/powerpc/mm/book3s32/hash_low.S | 14 -
arch/powerpc/mm/book3s32/kuep.c | 38 +
arch/powerpc/mm/fault.c | 4 +-
31 files changed, 875 insertions(+), 1518 deletions(-)
create mode 100644 arch/powerpc/mm/book3s32/kuep.c


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