/
hvtramp.S
140 lines (110 loc) · 2.68 KB
/
hvtramp.S
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/* hvtramp.S: Hypervisor start-cpu trampoline code.
*
* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
*/
#include <linux/init.h>
#include <asm/thread_info.h>
#include <asm/hypervisor.h>
#include <asm/scratchpad.h>
#include <asm/spitfire.h>
#include <asm/hvtramp.h>
#include <asm/pstate.h>
#include <asm/ptrace.h>
#include <asm/head.h>
#include <asm/asi.h>
#include <asm/pil.h>
__CPUINIT
.align 8
.globl hv_cpu_startup, hv_cpu_startup_end
/* This code executes directly out of the hypervisor
* with physical addressing (va==pa). %o0 contains
* our client argument which for Linux points to
* a descriptor data structure which defines the
* MMU entries we need to load up.
*
* After we set things up we enable the MMU and call
* into the kernel.
*
* First setup basic privileged cpu state.
*/
hv_cpu_startup:
SET_GL(0)
wrpr %g0, PIL_NORMAL_MAX, %pil
wrpr %g0, 0, %canrestore
wrpr %g0, 0, %otherwin
wrpr %g0, 6, %cansave
wrpr %g0, 6, %cleanwin
wrpr %g0, 0, %cwp
wrpr %g0, 0, %wstate
wrpr %g0, 0, %tl
sethi %hi(sparc64_ttable_tl0), %g1
wrpr %g1, %tba
mov %o0, %l0
lduw [%l0 + HVTRAMP_DESCR_CPU], %g1
mov SCRATCHPAD_CPUID, %g2
stxa %g1, [%g2] ASI_SCRATCHPAD
ldx [%l0 + HVTRAMP_DESCR_FAULT_INFO_VA], %g2
stxa %g2, [%g0] ASI_SCRATCHPAD
mov 0, %l1
lduw [%l0 + HVTRAMP_DESCR_NUM_MAPPINGS], %l2
add %l0, HVTRAMP_DESCR_MAPS, %l3
1: ldx [%l3 + HVTRAMP_MAPPING_VADDR], %o0
clr %o1
ldx [%l3 + HVTRAMP_MAPPING_TTE], %o2
mov HV_MMU_IMMU | HV_MMU_DMMU, %o3
mov HV_FAST_MMU_MAP_PERM_ADDR, %o5
ta HV_FAST_TRAP
brnz,pn %o0, 80f
nop
add %l1, 1, %l1
cmp %l1, %l2
blt,a,pt %xcc, 1b
add %l3, HVTRAMP_MAPPING_SIZE, %l3
ldx [%l0 + HVTRAMP_DESCR_FAULT_INFO_PA], %o0
mov HV_FAST_MMU_FAULT_AREA_CONF, %o5
ta HV_FAST_TRAP
brnz,pn %o0, 80f
nop
wrpr %g0, (PSTATE_PRIV | PSTATE_PEF), %pstate
ldx [%l0 + HVTRAMP_DESCR_THREAD_REG], %l6
mov 1, %o0
set 1f, %o1
mov HV_FAST_MMU_ENABLE, %o5
ta HV_FAST_TRAP
ba,pt %xcc, 80f
nop
1:
wr %g0, 0, %fprs
wr %g0, ASI_P, %asi
mov PRIMARY_CONTEXT, %g7
stxa %g0, [%g7] ASI_MMU
membar #Sync
mov SECONDARY_CONTEXT, %g7
stxa %g0, [%g7] ASI_MMU
membar #Sync
mov %l6, %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
mov 0, %fp
call init_irqwork_curcpu
nop
call hard_smp_processor_id
nop
call sun4v_register_mondo_queues
nop
call init_cur_cpu_trap
mov %g6, %o0
wrpr %g0, (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE), %pstate
call smp_callin
nop
call cpu_idle
mov 0, %o0
call cpu_panic
nop
80: ba,pt %xcc, 80b
nop
.align 8
hv_cpu_startup_end: