forked from luck/tmp_suning_uos_patched
ef3e035c3a
Meelis Roos reported that kernels built with gcc-4.9 do not boot, we eventually narrowed this down to only impacting machines using UltraSPARC-III and derivitive cpus. The crash happens right when the first user process is spawned: [ 54.451346] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004 [ 54.451346] [ 54.571516] CPU: 1 PID: 1 Comm: init Not tainted 3.16.0-rc2-00211-gd7933ab #96 [ 54.666431] Call Trace: [ 54.698453] [0000000000762f8c] panic+0xb0/0x224 [ 54.759071] [000000000045cf68] do_exit+0x948/0x960 [ 54.823123] [000000000042cbc0] fault_in_user_windows+0xe0/0x100 [ 54.902036] [0000000000404ad0] __handle_user_windows+0x0/0x10 [ 54.978662] Press Stop-A (L1-A) to return to the boot prom [ 55.050713] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004 Further investigation showed that compiling only per_cpu_patch() with an older compiler fixes the boot. Detailed analysis showed that the function is not being miscompiled by gcc-4.9, but it is using a different register allocation ordering. With the gcc-4.9 compiled function, something during the code patching causes some of the %i* input registers to get corrupted. Perhaps we have a TLB miss path into the firmware that is deep enough to cause a register window spill and subsequent restore when we get back from the TLB miss trap. Let's plug this up by doing two things: 1) Stop using the firmware stack for client interface calls into the firmware. Just use the kernel's stack. 2) As soon as we can, call into a new function "start_early_boot()" to put a one-register-window buffer between the firmware's deepest stack frame and the top-most initial kernel one. Reported-by: Meelis Roos <mroos@linux.ee> Tested-by: Meelis Roos <mroos@linux.ee> Signed-off-by: David S. Miller <davem@davemloft.net>
414 lines
9.1 KiB
ArmAsm
414 lines
9.1 KiB
ArmAsm
/*
|
|
* trampoline.S: Jump start slave processors on sparc64.
|
|
*
|
|
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
|
|
*/
|
|
|
|
|
|
#include <asm/head.h>
|
|
#include <asm/asi.h>
|
|
#include <asm/lsu.h>
|
|
#include <asm/dcr.h>
|
|
#include <asm/dcu.h>
|
|
#include <asm/pstate.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/spitfire.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/hypervisor.h>
|
|
#include <asm/cpudata.h>
|
|
|
|
.data
|
|
.align 8
|
|
call_method:
|
|
.asciz "call-method"
|
|
.align 8
|
|
itlb_load:
|
|
.asciz "SUNW,itlb-load"
|
|
.align 8
|
|
dtlb_load:
|
|
.asciz "SUNW,dtlb-load"
|
|
|
|
#define TRAMP_STACK_SIZE 1024
|
|
.align 16
|
|
tramp_stack:
|
|
.skip TRAMP_STACK_SIZE
|
|
|
|
.align 8
|
|
.globl sparc64_cpu_startup, sparc64_cpu_startup_end
|
|
sparc64_cpu_startup:
|
|
BRANCH_IF_SUN4V(g1, niagara_startup)
|
|
BRANCH_IF_CHEETAH_BASE(g1, g5, cheetah_startup)
|
|
BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1, g5, cheetah_plus_startup)
|
|
|
|
ba,pt %xcc, spitfire_startup
|
|
nop
|
|
|
|
cheetah_plus_startup:
|
|
/* Preserve OBP chosen DCU and DCR register settings. */
|
|
ba,pt %xcc, cheetah_generic_startup
|
|
nop
|
|
|
|
cheetah_startup:
|
|
mov DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
|
|
wr %g1, %asr18
|
|
|
|
sethi %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g5
|
|
or %g5, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g5
|
|
sllx %g5, 32, %g5
|
|
or %g5, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g5
|
|
stxa %g5, [%g0] ASI_DCU_CONTROL_REG
|
|
membar #Sync
|
|
/* fallthru */
|
|
|
|
cheetah_generic_startup:
|
|
mov TSB_EXTENSION_P, %g3
|
|
stxa %g0, [%g3] ASI_DMMU
|
|
stxa %g0, [%g3] ASI_IMMU
|
|
membar #Sync
|
|
|
|
mov TSB_EXTENSION_S, %g3
|
|
stxa %g0, [%g3] ASI_DMMU
|
|
membar #Sync
|
|
|
|
mov TSB_EXTENSION_N, %g3
|
|
stxa %g0, [%g3] ASI_DMMU
|
|
stxa %g0, [%g3] ASI_IMMU
|
|
membar #Sync
|
|
/* fallthru */
|
|
|
|
niagara_startup:
|
|
/* Disable STICK_INT interrupts. */
|
|
sethi %hi(0x80000000), %g5
|
|
sllx %g5, 32, %g5
|
|
wr %g5, %asr25
|
|
|
|
ba,pt %xcc, startup_continue
|
|
nop
|
|
|
|
spitfire_startup:
|
|
mov (LSU_CONTROL_IC | LSU_CONTROL_DC | LSU_CONTROL_IM | LSU_CONTROL_DM), %g1
|
|
stxa %g1, [%g0] ASI_LSU_CONTROL
|
|
membar #Sync
|
|
|
|
startup_continue:
|
|
mov %o0, %l0
|
|
BRANCH_IF_SUN4V(g1, niagara_lock_tlb)
|
|
|
|
sethi %hi(0x80000000), %g2
|
|
sllx %g2, 32, %g2
|
|
wr %g2, 0, %tick_cmpr
|
|
|
|
/* Call OBP by hand to lock KERNBASE into i/d tlbs.
|
|
* We lock 'num_kernel_image_mappings' consequetive entries.
|
|
*/
|
|
sethi %hi(prom_entry_lock), %g2
|
|
1: ldstub [%g2 + %lo(prom_entry_lock)], %g1
|
|
brnz,pn %g1, 1b
|
|
nop
|
|
|
|
/* Get onto temporary stack which will be in the locked
|
|
* kernel image.
|
|
*/
|
|
sethi %hi(tramp_stack), %g1
|
|
or %g1, %lo(tramp_stack), %g1
|
|
add %g1, TRAMP_STACK_SIZE, %g1
|
|
sub %g1, STACKFRAME_SZ + STACK_BIAS + 256, %sp
|
|
flushw
|
|
|
|
/* Setup the loop variables:
|
|
* %l3: VADDR base
|
|
* %l4: TTE base
|
|
* %l5: Loop iterator, iterates from 0 to 'num_kernel_image_mappings'
|
|
* %l6: Number of TTE entries to map
|
|
* %l7: Highest TTE entry number, we count down
|
|
*/
|
|
sethi %hi(KERNBASE), %l3
|
|
sethi %hi(kern_locked_tte_data), %l4
|
|
ldx [%l4 + %lo(kern_locked_tte_data)], %l4
|
|
clr %l5
|
|
sethi %hi(num_kernel_image_mappings), %l6
|
|
lduw [%l6 + %lo(num_kernel_image_mappings)], %l6
|
|
|
|
mov 15, %l7
|
|
BRANCH_IF_ANY_CHEETAH(g1,g5,2f)
|
|
|
|
mov 63, %l7
|
|
2:
|
|
|
|
3:
|
|
/* Lock into I-MMU */
|
|
sethi %hi(call_method), %g2
|
|
or %g2, %lo(call_method), %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x00]
|
|
mov 5, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x08]
|
|
mov 1, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x10]
|
|
sethi %hi(itlb_load), %g2
|
|
or %g2, %lo(itlb_load), %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x18]
|
|
sethi %hi(prom_mmu_ihandle_cache), %g2
|
|
lduw [%g2 + %lo(prom_mmu_ihandle_cache)], %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x20]
|
|
|
|
/* Each TTE maps 4MB, convert index to offset. */
|
|
sllx %l5, 22, %g1
|
|
|
|
add %l3, %g1, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x28] ! VADDR
|
|
add %l4, %g1, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x30] ! TTE
|
|
|
|
/* TTE index is highest minus loop index. */
|
|
sub %l7, %l5, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x38]
|
|
|
|
sethi %hi(p1275buf), %g2
|
|
or %g2, %lo(p1275buf), %g2
|
|
ldx [%g2 + 0x08], %o1
|
|
call %o1
|
|
add %sp, (2047 + 128), %o0
|
|
|
|
/* Lock into D-MMU */
|
|
sethi %hi(call_method), %g2
|
|
or %g2, %lo(call_method), %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x00]
|
|
mov 5, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x08]
|
|
mov 1, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x10]
|
|
sethi %hi(dtlb_load), %g2
|
|
or %g2, %lo(dtlb_load), %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x18]
|
|
sethi %hi(prom_mmu_ihandle_cache), %g2
|
|
lduw [%g2 + %lo(prom_mmu_ihandle_cache)], %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x20]
|
|
|
|
/* Each TTE maps 4MB, convert index to offset. */
|
|
sllx %l5, 22, %g1
|
|
|
|
add %l3, %g1, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x28] ! VADDR
|
|
add %l4, %g1, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x30] ! TTE
|
|
|
|
/* TTE index is highest minus loop index. */
|
|
sub %l7, %l5, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x38]
|
|
|
|
sethi %hi(p1275buf), %g2
|
|
or %g2, %lo(p1275buf), %g2
|
|
ldx [%g2 + 0x08], %o1
|
|
call %o1
|
|
add %sp, (2047 + 128), %o0
|
|
|
|
add %l5, 1, %l5
|
|
cmp %l5, %l6
|
|
bne,pt %xcc, 3b
|
|
nop
|
|
|
|
sethi %hi(prom_entry_lock), %g2
|
|
stb %g0, [%g2 + %lo(prom_entry_lock)]
|
|
|
|
ba,pt %xcc, after_lock_tlb
|
|
nop
|
|
|
|
niagara_lock_tlb:
|
|
sethi %hi(KERNBASE), %l3
|
|
sethi %hi(kern_locked_tte_data), %l4
|
|
ldx [%l4 + %lo(kern_locked_tte_data)], %l4
|
|
clr %l5
|
|
sethi %hi(num_kernel_image_mappings), %l6
|
|
lduw [%l6 + %lo(num_kernel_image_mappings)], %l6
|
|
|
|
1:
|
|
mov HV_FAST_MMU_MAP_PERM_ADDR, %o5
|
|
sllx %l5, 22, %g2
|
|
add %l3, %g2, %o0
|
|
clr %o1
|
|
add %l4, %g2, %o2
|
|
mov HV_MMU_IMMU, %o3
|
|
ta HV_FAST_TRAP
|
|
|
|
mov HV_FAST_MMU_MAP_PERM_ADDR, %o5
|
|
sllx %l5, 22, %g2
|
|
add %l3, %g2, %o0
|
|
clr %o1
|
|
add %l4, %g2, %o2
|
|
mov HV_MMU_DMMU, %o3
|
|
ta HV_FAST_TRAP
|
|
|
|
add %l5, 1, %l5
|
|
cmp %l5, %l6
|
|
bne,pt %xcc, 1b
|
|
nop
|
|
|
|
after_lock_tlb:
|
|
wrpr %g0, (PSTATE_PRIV | PSTATE_PEF), %pstate
|
|
wr %g0, 0, %fprs
|
|
|
|
wr %g0, ASI_P, %asi
|
|
|
|
mov PRIMARY_CONTEXT, %g7
|
|
|
|
661: stxa %g0, [%g7] ASI_DMMU
|
|
.section .sun4v_1insn_patch, "ax"
|
|
.word 661b
|
|
stxa %g0, [%g7] ASI_MMU
|
|
.previous
|
|
|
|
membar #Sync
|
|
mov SECONDARY_CONTEXT, %g7
|
|
|
|
661: stxa %g0, [%g7] ASI_DMMU
|
|
.section .sun4v_1insn_patch, "ax"
|
|
.word 661b
|
|
stxa %g0, [%g7] ASI_MMU
|
|
.previous
|
|
|
|
membar #Sync
|
|
|
|
/* Everything we do here, until we properly take over the
|
|
* trap table, must be done with extreme care. We cannot
|
|
* make any references to %g6 (current thread pointer),
|
|
* %g4 (current task pointer), or %g5 (base of current cpu's
|
|
* per-cpu area) until we properly take over the trap table
|
|
* from the firmware and hypervisor.
|
|
*
|
|
* Get onto temporary stack which is in the locked kernel image.
|
|
*/
|
|
sethi %hi(tramp_stack), %g1
|
|
or %g1, %lo(tramp_stack), %g1
|
|
add %g1, TRAMP_STACK_SIZE, %g1
|
|
sub %g1, STACKFRAME_SZ + STACK_BIAS + 256, %sp
|
|
mov 0, %fp
|
|
|
|
/* Put garbage in these registers to trap any access to them. */
|
|
set 0xdeadbeef, %g4
|
|
set 0xdeadbeef, %g5
|
|
set 0xdeadbeef, %g6
|
|
|
|
call init_irqwork_curcpu
|
|
nop
|
|
|
|
sethi %hi(tlb_type), %g3
|
|
lduw [%g3 + %lo(tlb_type)], %g2
|
|
cmp %g2, 3
|
|
bne,pt %icc, 1f
|
|
nop
|
|
|
|
call hard_smp_processor_id
|
|
nop
|
|
|
|
call sun4v_register_mondo_queues
|
|
nop
|
|
|
|
1: call init_cur_cpu_trap
|
|
ldx [%l0], %o0
|
|
|
|
/* Start using proper page size encodings in ctx register. */
|
|
sethi %hi(sparc64_kern_pri_context), %g3
|
|
ldx [%g3 + %lo(sparc64_kern_pri_context)], %g2
|
|
mov PRIMARY_CONTEXT, %g1
|
|
|
|
661: stxa %g2, [%g1] ASI_DMMU
|
|
.section .sun4v_1insn_patch, "ax"
|
|
.word 661b
|
|
stxa %g2, [%g1] ASI_MMU
|
|
.previous
|
|
|
|
membar #Sync
|
|
|
|
wrpr %g0, 0, %wstate
|
|
|
|
sethi %hi(prom_entry_lock), %g2
|
|
1: ldstub [%g2 + %lo(prom_entry_lock)], %g1
|
|
brnz,pn %g1, 1b
|
|
nop
|
|
|
|
/* As a hack, put &init_thread_union into %g6.
|
|
* prom_world() loads from here to restore the %asi
|
|
* register.
|
|
*/
|
|
sethi %hi(init_thread_union), %g6
|
|
or %g6, %lo(init_thread_union), %g6
|
|
|
|
sethi %hi(is_sun4v), %o0
|
|
lduw [%o0 + %lo(is_sun4v)], %o0
|
|
brz,pt %o0, 2f
|
|
nop
|
|
|
|
TRAP_LOAD_TRAP_BLOCK(%g2, %g3)
|
|
add %g2, TRAP_PER_CPU_FAULT_INFO, %g2
|
|
stxa %g2, [%g0] ASI_SCRATCHPAD
|
|
|
|
/* Compute physical address:
|
|
*
|
|
* paddr = kern_base + (mmfsa_vaddr - KERNBASE)
|
|
*/
|
|
sethi %hi(KERNBASE), %g3
|
|
sub %g2, %g3, %g2
|
|
sethi %hi(kern_base), %g3
|
|
ldx [%g3 + %lo(kern_base)], %g3
|
|
add %g2, %g3, %o1
|
|
sethi %hi(sparc64_ttable_tl0), %o0
|
|
|
|
set prom_set_trap_table_name, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x00]
|
|
mov 2, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x08]
|
|
mov 0, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x10]
|
|
stx %o0, [%sp + 2047 + 128 + 0x18]
|
|
stx %o1, [%sp + 2047 + 128 + 0x20]
|
|
sethi %hi(p1275buf), %g2
|
|
or %g2, %lo(p1275buf), %g2
|
|
ldx [%g2 + 0x08], %o1
|
|
call %o1
|
|
add %sp, (2047 + 128), %o0
|
|
|
|
ba,pt %xcc, 3f
|
|
nop
|
|
|
|
2: sethi %hi(sparc64_ttable_tl0), %o0
|
|
set prom_set_trap_table_name, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x00]
|
|
mov 1, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x08]
|
|
mov 0, %g2
|
|
stx %g2, [%sp + 2047 + 128 + 0x10]
|
|
stx %o0, [%sp + 2047 + 128 + 0x18]
|
|
sethi %hi(p1275buf), %g2
|
|
or %g2, %lo(p1275buf), %g2
|
|
ldx [%g2 + 0x08], %o1
|
|
call %o1
|
|
add %sp, (2047 + 128), %o0
|
|
|
|
3: sethi %hi(prom_entry_lock), %g2
|
|
stb %g0, [%g2 + %lo(prom_entry_lock)]
|
|
|
|
ldx [%l0], %g6
|
|
ldx [%g6 + TI_TASK], %g4
|
|
|
|
mov 1, %g5
|
|
sllx %g5, THREAD_SHIFT, %g5
|
|
sub %g5, (STACKFRAME_SZ + STACK_BIAS), %g5
|
|
add %g6, %g5, %sp
|
|
|
|
rdpr %pstate, %o1
|
|
or %o1, PSTATE_IE, %o1
|
|
wrpr %o1, 0, %pstate
|
|
|
|
call smp_callin
|
|
nop
|
|
|
|
call cpu_panic
|
|
nop
|
|
1: b,a,pt %xcc, 1b
|
|
|
|
.align 8
|
|
sparc64_cpu_startup_end:
|