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2066aadd53
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/sparc uses of the __cpuinit macros from
C files and removes __CPUINIT from assembly files. Note that even
though arch/sparc/kernel/trampoline_64.S has instances of ".previous"
in it, they are all paired off against explicit ".section" directives,
and not implicitly paired with __CPUINIT (unlike mips and arm were).
[1] https://lkml.org/lkml/2013/5/20/589
Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
139 lines
2.6 KiB
ArmAsm
139 lines
2.6 KiB
ArmAsm
/* hvtramp.S: Hypervisor start-cpu trampoline code.
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*
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* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
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*/
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#include <linux/init.h>
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#include <asm/thread_info.h>
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#include <asm/hypervisor.h>
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#include <asm/scratchpad.h>
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#include <asm/spitfire.h>
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#include <asm/hvtramp.h>
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#include <asm/pstate.h>
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#include <asm/ptrace.h>
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#include <asm/head.h>
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#include <asm/asi.h>
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#include <asm/pil.h>
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.align 8
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.globl hv_cpu_startup, hv_cpu_startup_end
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/* This code executes directly out of the hypervisor
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* with physical addressing (va==pa). %o0 contains
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* our client argument which for Linux points to
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* a descriptor data structure which defines the
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* MMU entries we need to load up.
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*
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* After we set things up we enable the MMU and call
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* into the kernel.
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*
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* First setup basic privileged cpu state.
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*/
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hv_cpu_startup:
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SET_GL(0)
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wrpr %g0, PIL_NORMAL_MAX, %pil
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wrpr %g0, 0, %canrestore
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wrpr %g0, 0, %otherwin
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wrpr %g0, 6, %cansave
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wrpr %g0, 6, %cleanwin
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wrpr %g0, 0, %cwp
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wrpr %g0, 0, %wstate
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wrpr %g0, 0, %tl
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sethi %hi(sparc64_ttable_tl0), %g1
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wrpr %g1, %tba
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mov %o0, %l0
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lduw [%l0 + HVTRAMP_DESCR_CPU], %g1
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mov SCRATCHPAD_CPUID, %g2
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stxa %g1, [%g2] ASI_SCRATCHPAD
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ldx [%l0 + HVTRAMP_DESCR_FAULT_INFO_VA], %g2
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stxa %g2, [%g0] ASI_SCRATCHPAD
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mov 0, %l1
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lduw [%l0 + HVTRAMP_DESCR_NUM_MAPPINGS], %l2
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add %l0, HVTRAMP_DESCR_MAPS, %l3
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1: ldx [%l3 + HVTRAMP_MAPPING_VADDR], %o0
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clr %o1
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ldx [%l3 + HVTRAMP_MAPPING_TTE], %o2
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mov HV_MMU_IMMU | HV_MMU_DMMU, %o3
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mov HV_FAST_MMU_MAP_PERM_ADDR, %o5
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ta HV_FAST_TRAP
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brnz,pn %o0, 80f
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nop
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add %l1, 1, %l1
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cmp %l1, %l2
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blt,a,pt %xcc, 1b
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add %l3, HVTRAMP_MAPPING_SIZE, %l3
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ldx [%l0 + HVTRAMP_DESCR_FAULT_INFO_PA], %o0
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mov HV_FAST_MMU_FAULT_AREA_CONF, %o5
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ta HV_FAST_TRAP
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brnz,pn %o0, 80f
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nop
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wrpr %g0, (PSTATE_PRIV | PSTATE_PEF), %pstate
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ldx [%l0 + HVTRAMP_DESCR_THREAD_REG], %l6
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mov 1, %o0
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set 1f, %o1
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mov HV_FAST_MMU_ENABLE, %o5
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ta HV_FAST_TRAP
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ba,pt %xcc, 80f
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nop
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1:
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wr %g0, 0, %fprs
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wr %g0, ASI_P, %asi
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mov PRIMARY_CONTEXT, %g7
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stxa %g0, [%g7] ASI_MMU
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membar #Sync
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mov SECONDARY_CONTEXT, %g7
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stxa %g0, [%g7] ASI_MMU
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membar #Sync
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mov %l6, %g6
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ldx [%g6 + TI_TASK], %g4
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mov 1, %g5
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sllx %g5, THREAD_SHIFT, %g5
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sub %g5, (STACKFRAME_SZ + STACK_BIAS), %g5
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add %g6, %g5, %sp
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mov 0, %fp
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call init_irqwork_curcpu
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nop
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call hard_smp_processor_id
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nop
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call sun4v_register_mondo_queues
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nop
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call init_cur_cpu_trap
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mov %g6, %o0
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wrpr %g0, (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE), %pstate
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call smp_callin
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nop
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call cpu_panic
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nop
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80: ba,pt %xcc, 80b
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nop
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.align 8
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hv_cpu_startup_end:
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