linux/arch/sparc/kernel/hvtramp.S
Sam Ravnborg a88b5ba8bd sparc,sparc64: unify kernel/
o Move all files from sparc64/kernel/ to sparc/kernel
  - rename as appropriate
o Update sparc/Makefile to the changes
o Update sparc/kernel/Makefile to include the sparc64 files

NOTE: This commit changes link order on sparc64!

Link order had to change for either of sparc32 and sparc64.
And assuming sparc64 see more testing than sparc32 change link
order on sparc64 where issues will be caught faster.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-12-04 09:17:21 -08:00

140 lines
2.7 KiB
ArmAsm

/* 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: