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linux/arch/ia64/kernel/head.S
Tony Luck 2c86963b09 [IA64] implement ticket locks for Itanium 
Back in January 2008 Nick Piggin implemented "ticket" spinlocks
for X86 (See commit 314cdbefd1).

IA64 implementation has a couple of differences because of the
available atomic operations ... e.g. we have no fetchadd2 instruction
that operates on a 16-bit quantity so we make ticket locks use
a 32-bit word for each of the current ticket and now-serving values.

Performance on uncontended locks is about 8% worse than the previous
implementation, but this seems a good trade for determinism in the
contended case. Performance impact on macro-level benchmarks is in
the noise.

Signed-off-by: Tony Luck <tony.luck@intel.com>
2009-09-25 08:42:16 -07:00

1230 lines
29 KiB
ArmAsm
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/*
* Here is where the ball gets rolling as far as the kernel is concerned.
* When control is transferred to _start, the bootload has already
* loaded us to the correct address. All that's left to do here is
* to set up the kernel's global pointer and jump to the kernel
* entry point.
*
* Copyright (C) 1998-2001, 2003, 2005 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
* Stephane Eranian <eranian@hpl.hp.com>
* Copyright (C) 1999 VA Linux Systems
* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
* Copyright (C) 1999 Intel Corp.
* Copyright (C) 1999 Asit Mallick <Asit.K.Mallick@intel.com>
* Copyright (C) 1999 Don Dugger <Don.Dugger@intel.com>
* Copyright (C) 2002 Fenghua Yu <fenghua.yu@intel.com>
* -Optimize __ia64_save_fpu() and __ia64_load_fpu() for Itanium 2.
* Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
* Support for CPU Hotplug
*/
#include <asm/asmmacro.h>
#include <asm/fpu.h>
#include <asm/kregs.h>
#include <asm/mmu_context.h>
#include <asm/asm-offsets.h>
#include <asm/pal.h>
#include <asm/paravirt.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/mca_asm.h>
#include <linux/init.h>
#include <linux/linkage.h>
#ifdef CONFIG_HOTPLUG_CPU
#define SAL_PSR_BITS_TO_SET \
(IA64_PSR_AC | IA64_PSR_BN | IA64_PSR_MFH | IA64_PSR_MFL)
#define SAVE_FROM_REG(src, ptr, dest) \
mov dest=src;; \
st8 [ptr]=dest,0x08
#define RESTORE_REG(reg, ptr, _tmp) \
ld8 _tmp=[ptr],0x08;; \
mov reg=_tmp
#define SAVE_BREAK_REGS(ptr, _idx, _breg, _dest)\
mov ar.lc=IA64_NUM_DBG_REGS-1;; \
mov _idx=0;; \
1: \
SAVE_FROM_REG(_breg[_idx], ptr, _dest);; \
add _idx=1,_idx;; \
br.cloop.sptk.many 1b
#define RESTORE_BREAK_REGS(ptr, _idx, _breg, _tmp, _lbl)\
mov ar.lc=IA64_NUM_DBG_REGS-1;; \
mov _idx=0;; \
_lbl: RESTORE_REG(_breg[_idx], ptr, _tmp);; \
add _idx=1, _idx;; \
br.cloop.sptk.many _lbl
#define SAVE_ONE_RR(num, _reg, _tmp) \
movl _tmp=(num<<61);; \
mov _reg=rr[_tmp]
#define SAVE_REGION_REGS(_tmp, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \
SAVE_ONE_RR(0,_r0, _tmp);; \
SAVE_ONE_RR(1,_r1, _tmp);; \
SAVE_ONE_RR(2,_r2, _tmp);; \
SAVE_ONE_RR(3,_r3, _tmp);; \
SAVE_ONE_RR(4,_r4, _tmp);; \
SAVE_ONE_RR(5,_r5, _tmp);; \
SAVE_ONE_RR(6,_r6, _tmp);; \
SAVE_ONE_RR(7,_r7, _tmp);;
#define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7) \
st8 [ptr]=_r0, 8;; \
st8 [ptr]=_r1, 8;; \
st8 [ptr]=_r2, 8;; \
st8 [ptr]=_r3, 8;; \
st8 [ptr]=_r4, 8;; \
st8 [ptr]=_r5, 8;; \
st8 [ptr]=_r6, 8;; \
st8 [ptr]=_r7, 8;;
#define RESTORE_REGION_REGS(ptr, _idx1, _idx2, _tmp) \
mov ar.lc=0x08-1;; \
movl _idx1=0x00;; \
RestRR: \
dep.z _idx2=_idx1,61,3;; \
ld8 _tmp=[ptr],8;; \
mov rr[_idx2]=_tmp;; \
srlz.d;; \
add _idx1=1,_idx1;; \
br.cloop.sptk.few RestRR
#define SET_AREA_FOR_BOOTING_CPU(reg1, reg2) \
movl reg1=sal_state_for_booting_cpu;; \
ld8 reg2=[reg1];;
/*
* Adjust region registers saved before starting to save
* break regs and rest of the states that need to be preserved.
*/
#define SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(_reg1,_reg2,_pred) \
SAVE_FROM_REG(b0,_reg1,_reg2);; \
SAVE_FROM_REG(b1,_reg1,_reg2);; \
SAVE_FROM_REG(b2,_reg1,_reg2);; \
SAVE_FROM_REG(b3,_reg1,_reg2);; \
SAVE_FROM_REG(b4,_reg1,_reg2);; \
SAVE_FROM_REG(b5,_reg1,_reg2);; \
st8 [_reg1]=r1,0x08;; \
st8 [_reg1]=r12,0x08;; \
st8 [_reg1]=r13,0x08;; \
SAVE_FROM_REG(ar.fpsr,_reg1,_reg2);; \
SAVE_FROM_REG(ar.pfs,_reg1,_reg2);; \
SAVE_FROM_REG(ar.rnat,_reg1,_reg2);; \
SAVE_FROM_REG(ar.unat,_reg1,_reg2);; \
SAVE_FROM_REG(ar.bspstore,_reg1,_reg2);; \
SAVE_FROM_REG(cr.dcr,_reg1,_reg2);; \
SAVE_FROM_REG(cr.iva,_reg1,_reg2);; \
SAVE_FROM_REG(cr.pta,_reg1,_reg2);; \
SAVE_FROM_REG(cr.itv,_reg1,_reg2);; \
SAVE_FROM_REG(cr.pmv,_reg1,_reg2);; \
SAVE_FROM_REG(cr.cmcv,_reg1,_reg2);; \
SAVE_FROM_REG(cr.lrr0,_reg1,_reg2);; \
SAVE_FROM_REG(cr.lrr1,_reg1,_reg2);; \
st8 [_reg1]=r4,0x08;; \
st8 [_reg1]=r5,0x08;; \
st8 [_reg1]=r6,0x08;; \
st8 [_reg1]=r7,0x08;; \
st8 [_reg1]=_pred,0x08;; \
SAVE_FROM_REG(ar.lc, _reg1, _reg2);; \
stf.spill.nta [_reg1]=f2,16;; \
stf.spill.nta [_reg1]=f3,16;; \
stf.spill.nta [_reg1]=f4,16;; \
stf.spill.nta [_reg1]=f5,16;; \
stf.spill.nta [_reg1]=f16,16;; \
stf.spill.nta [_reg1]=f17,16;; \
stf.spill.nta [_reg1]=f18,16;; \
stf.spill.nta [_reg1]=f19,16;; \
stf.spill.nta [_reg1]=f20,16;; \
stf.spill.nta [_reg1]=f21,16;; \
stf.spill.nta [_reg1]=f22,16;; \
stf.spill.nta [_reg1]=f23,16;; \
stf.spill.nta [_reg1]=f24,16;; \
stf.spill.nta [_reg1]=f25,16;; \
stf.spill.nta [_reg1]=f26,16;; \
stf.spill.nta [_reg1]=f27,16;; \
stf.spill.nta [_reg1]=f28,16;; \
stf.spill.nta [_reg1]=f29,16;; \
stf.spill.nta [_reg1]=f30,16;; \
stf.spill.nta [_reg1]=f31,16;;
#else
#define SET_AREA_FOR_BOOTING_CPU(a1, a2)
#define SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(a1,a2, a3)
#define SAVE_REGION_REGS(_tmp, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7)
#define STORE_REGION_REGS(ptr, _r0, _r1, _r2, _r3, _r4, _r5, _r6, _r7)
#endif
#define SET_ONE_RR(num, pgsize, _tmp1, _tmp2, vhpt) \
movl _tmp1=(num << 61);; \
mov _tmp2=((ia64_rid(IA64_REGION_ID_KERNEL, (num<<61)) << 8) | (pgsize << 2) | vhpt);; \
mov rr[_tmp1]=_tmp2
__PAGE_ALIGNED_DATA
.global empty_zero_page
empty_zero_page:
.skip PAGE_SIZE
.global swapper_pg_dir
swapper_pg_dir:
.skip PAGE_SIZE
.rodata
halt_msg:
stringz "Halting kernel\n"
__REF
.global start_ap
/*
* Start the kernel. When the bootloader passes control to _start(), r28
* points to the address of the boot parameter area. Execution reaches
* here in physical mode.
*/
GLOBAL_ENTRY(_start)
start_ap:
.prologue
.save rp, r0 // terminate unwind chain with a NULL rp
.body
rsm psr.i | psr.ic
;;
srlz.i
;;
{
flushrs // must be first insn in group
srlz.i
}
;;
/*
* Save the region registers, predicate before they get clobbered
*/
SAVE_REGION_REGS(r2, r8,r9,r10,r11,r12,r13,r14,r15);
mov r25=pr;;
/*
* Initialize kernel region registers:
* rr[0]: VHPT enabled, page size = PAGE_SHIFT
* rr[1]: VHPT enabled, page size = PAGE_SHIFT
* rr[2]: VHPT enabled, page size = PAGE_SHIFT
* rr[3]: VHPT enabled, page size = PAGE_SHIFT
* rr[4]: VHPT enabled, page size = PAGE_SHIFT
* rr[5]: VHPT enabled, page size = PAGE_SHIFT
* rr[6]: VHPT disabled, page size = IA64_GRANULE_SHIFT
* rr[7]: VHPT disabled, page size = IA64_GRANULE_SHIFT
* We initialize all of them to prevent inadvertently assuming
* something about the state of address translation early in boot.
*/
SET_ONE_RR(0, PAGE_SHIFT, r2, r16, 1);;
SET_ONE_RR(1, PAGE_SHIFT, r2, r16, 1);;
SET_ONE_RR(2, PAGE_SHIFT, r2, r16, 1);;
SET_ONE_RR(3, PAGE_SHIFT, r2, r16, 1);;
SET_ONE_RR(4, PAGE_SHIFT, r2, r16, 1);;
SET_ONE_RR(5, PAGE_SHIFT, r2, r16, 1);;
SET_ONE_RR(6, IA64_GRANULE_SHIFT, r2, r16, 0);;
SET_ONE_RR(7, IA64_GRANULE_SHIFT, r2, r16, 0);;
/*
* Now pin mappings into the TLB for kernel text and data
*/
mov r18=KERNEL_TR_PAGE_SHIFT<<2
movl r17=KERNEL_START
;;
mov cr.itir=r18
mov cr.ifa=r17
mov r16=IA64_TR_KERNEL
mov r3=ip
movl r18=PAGE_KERNEL
;;
dep r2=0,r3,0,KERNEL_TR_PAGE_SHIFT
;;
or r18=r2,r18
;;
srlz.i
;;
itr.i itr[r16]=r18
;;
itr.d dtr[r16]=r18
;;
srlz.i
/*
* Switch into virtual mode:
*/
movl r16=(IA64_PSR_IT|IA64_PSR_IC|IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_DFH|IA64_PSR_BN \
|IA64_PSR_DI|IA64_PSR_AC)
;;
mov cr.ipsr=r16
movl r17=1f
;;
mov cr.iip=r17
mov cr.ifs=r0
;;
rfi
;;
1: // now we are in virtual mode
SET_AREA_FOR_BOOTING_CPU(r2, r16);
STORE_REGION_REGS(r16, r8,r9,r10,r11,r12,r13,r14,r15);
SAL_TO_OS_BOOT_HANDOFF_STATE_SAVE(r16,r17,r25)
;;
// set IVT entry point---can't access I/O ports without it
movl r3=ia64_ivt
;;
mov cr.iva=r3
movl r2=FPSR_DEFAULT
;;
srlz.i
movl gp=__gp
mov ar.fpsr=r2
;;
#define isAP p2 // are we an Application Processor?
#define isBP p3 // are we the Bootstrap Processor?
#ifdef CONFIG_SMP
/*
* Find the init_task for the currently booting CPU. At poweron, and in
* UP mode, task_for_booting_cpu is NULL.
*/
movl r3=task_for_booting_cpu
;;
ld8 r3=[r3]
movl r2=init_task
;;
cmp.eq isBP,isAP=r3,r0
;;
(isAP) mov r2=r3
#else
movl r2=init_task
cmp.eq isBP,isAP=r0,r0
#endif
;;
tpa r3=r2 // r3 == phys addr of task struct
mov r16=-1
(isBP) br.cond.dpnt .load_current // BP stack is on region 5 --- no need to map it
// load mapping for stack (virtaddr in r2, physaddr in r3)
rsm psr.ic
movl r17=PAGE_KERNEL
;;
srlz.d
dep r18=0,r3,0,12
;;
or r18=r17,r18
dep r2=-1,r3,61,3 // IMVA of task
;;
mov r17=rr[r2]
shr.u r16=r3,IA64_GRANULE_SHIFT
;;
dep r17=0,r17,8,24
;;
mov cr.itir=r17
mov cr.ifa=r2
mov r19=IA64_TR_CURRENT_STACK
;;
itr.d dtr[r19]=r18
;;
ssm psr.ic
srlz.d
;;
.load_current:
// load the "current" pointer (r13) and ar.k6 with the current task
mov IA64_KR(CURRENT)=r2 // virtual address
mov IA64_KR(CURRENT_STACK)=r16
mov r13=r2
/*
* Reserve space at the top of the stack for "struct pt_regs". Kernel
* threads don't store interesting values in that structure, but the space
* still needs to be there because time-critical stuff such as the context
* switching can be implemented more efficiently (for example, __switch_to()
* always sets the psr.dfh bit of the task it is switching to).
*/
addl r12=IA64_STK_OFFSET-IA64_PT_REGS_SIZE-16,r2
addl r2=IA64_RBS_OFFSET,r2 // initialize the RSE
mov ar.rsc=0 // place RSE in enforced lazy mode
;;
loadrs // clear the dirty partition
movl r19=__phys_per_cpu_start
mov r18=PERCPU_PAGE_SIZE
;;
#ifndef CONFIG_SMP
add r19=r19,r18
;;
#else
(isAP) br.few 2f
movl r20=__cpu0_per_cpu
;;
shr.u r18=r18,3
1:
ld8 r21=[r19],8;;
st8[r20]=r21,8
adds r18=-1,r18;;
cmp4.lt p7,p6=0,r18
(p7) br.cond.dptk.few 1b
mov r19=r20
;;
2:
#endif
tpa r19=r19
;;
.pred.rel.mutex isBP,isAP
(isBP) mov IA64_KR(PER_CPU_DATA)=r19 // per-CPU base for cpu0
(isAP) mov IA64_KR(PER_CPU_DATA)=r0 // clear physical per-CPU base
;;
mov ar.bspstore=r2 // establish the new RSE stack
;;
mov ar.rsc=0x3 // place RSE in eager mode
(isBP) dep r28=-1,r28,61,3 // make address virtual
(isBP) movl r2=ia64_boot_param
;;
(isBP) st8 [r2]=r28 // save the address of the boot param area passed by the bootloader
#ifdef CONFIG_PARAVIRT
movl r14=hypervisor_setup_hooks
movl r15=hypervisor_type
mov r16=num_hypervisor_hooks
;;
ld8 r2=[r15]
;;
cmp.ltu p7,p0=r2,r16 // array size check
shladd r8=r2,3,r14
;;
(p7) ld8 r9=[r8]
;;
(p7) mov b1=r9
(p7) cmp.ne.unc p7,p0=r9,r0 // no actual branch to NULL
;;
(p7) br.call.sptk.many rp=b1
__INITDATA
default_setup_hook = 0 // Currently nothing needs to be done.
.weak xen_setup_hook
.global hypervisor_type
hypervisor_type:
data8 PARAVIRT_HYPERVISOR_TYPE_DEFAULT
// must have the same order with PARAVIRT_HYPERVISOR_TYPE_xxx
hypervisor_setup_hooks:
data8 default_setup_hook
data8 xen_setup_hook
num_hypervisor_hooks = (. - hypervisor_setup_hooks) / 8
.previous
#endif
#ifdef CONFIG_SMP
(isAP) br.call.sptk.many rp=start_secondary
.ret0:
(isAP) br.cond.sptk self
#endif
// This is executed by the bootstrap processor (bsp) only:
#ifdef CONFIG_IA64_FW_EMU
// initialize PAL & SAL emulator:
br.call.sptk.many rp=sys_fw_init
.ret1:
#endif
br.call.sptk.many rp=start_kernel
.ret2: addl r3=@ltoff(halt_msg),gp
;;
alloc r2=ar.pfs,8,0,2,0
;;
ld8 out0=[r3]
br.call.sptk.many b0=console_print
self: hint @pause
br.sptk.many self // endless loop
END(_start)
.text
GLOBAL_ENTRY(ia64_save_debug_regs)
alloc r16=ar.pfs,1,0,0,0
mov r20=ar.lc // preserve ar.lc
mov ar.lc=IA64_NUM_DBG_REGS-1
mov r18=0
add r19=IA64_NUM_DBG_REGS*8,in0
;;
1: mov r16=dbr[r18]
#ifdef CONFIG_ITANIUM
;;
srlz.d
#endif
mov r17=ibr[r18]
add r18=1,r18
;;
st8.nta [in0]=r16,8
st8.nta [r19]=r17,8
br.cloop.sptk.many 1b
;;
mov ar.lc=r20 // restore ar.lc
br.ret.sptk.many rp
END(ia64_save_debug_regs)
GLOBAL_ENTRY(ia64_load_debug_regs)
alloc r16=ar.pfs,1,0,0,0
lfetch.nta [in0]
mov r20=ar.lc // preserve ar.lc
add r19=IA64_NUM_DBG_REGS*8,in0
mov ar.lc=IA64_NUM_DBG_REGS-1
mov r18=-1
;;
1: ld8.nta r16=[in0],8
ld8.nta r17=[r19],8
add r18=1,r18
;;
mov dbr[r18]=r16
#ifdef CONFIG_ITANIUM
;;
srlz.d // Errata 132 (NoFix status)
#endif
mov ibr[r18]=r17
br.cloop.sptk.many 1b
;;
mov ar.lc=r20 // restore ar.lc
br.ret.sptk.many rp
END(ia64_load_debug_regs)
GLOBAL_ENTRY(__ia64_save_fpu)
alloc r2=ar.pfs,1,4,0,0
adds loc0=96*16-16,in0
adds loc1=96*16-16-128,in0
;;
stf.spill.nta [loc0]=f127,-256
stf.spill.nta [loc1]=f119,-256
;;
stf.spill.nta [loc0]=f111,-256
stf.spill.nta [loc1]=f103,-256
;;
stf.spill.nta [loc0]=f95,-256
stf.spill.nta [loc1]=f87,-256
;;
stf.spill.nta [loc0]=f79,-256
stf.spill.nta [loc1]=f71,-256
;;
stf.spill.nta [loc0]=f63,-256
stf.spill.nta [loc1]=f55,-256
adds loc2=96*16-32,in0
;;
stf.spill.nta [loc0]=f47,-256
stf.spill.nta [loc1]=f39,-256
adds loc3=96*16-32-128,in0
;;
stf.spill.nta [loc2]=f126,-256
stf.spill.nta [loc3]=f118,-256
;;
stf.spill.nta [loc2]=f110,-256
stf.spill.nta [loc3]=f102,-256
;;
stf.spill.nta [loc2]=f94,-256
stf.spill.nta [loc3]=f86,-256
;;
stf.spill.nta [loc2]=f78,-256
stf.spill.nta [loc3]=f70,-256
;;
stf.spill.nta [loc2]=f62,-256
stf.spill.nta [loc3]=f54,-256
adds loc0=96*16-48,in0
;;
stf.spill.nta [loc2]=f46,-256
stf.spill.nta [loc3]=f38,-256
adds loc1=96*16-48-128,in0
;;
stf.spill.nta [loc0]=f125,-256
stf.spill.nta [loc1]=f117,-256
;;
stf.spill.nta [loc0]=f109,-256
stf.spill.nta [loc1]=f101,-256
;;
stf.spill.nta [loc0]=f93,-256
stf.spill.nta [loc1]=f85,-256
;;
stf.spill.nta [loc0]=f77,-256
stf.spill.nta [loc1]=f69,-256
;;
stf.spill.nta [loc0]=f61,-256
stf.spill.nta [loc1]=f53,-256
adds loc2=96*16-64,in0
;;
stf.spill.nta [loc0]=f45,-256
stf.spill.nta [loc1]=f37,-256
adds loc3=96*16-64-128,in0
;;
stf.spill.nta [loc2]=f124,-256
stf.spill.nta [loc3]=f116,-256
;;
stf.spill.nta [loc2]=f108,-256
stf.spill.nta [loc3]=f100,-256
;;
stf.spill.nta [loc2]=f92,-256
stf.spill.nta [loc3]=f84,-256
;;
stf.spill.nta [loc2]=f76,-256
stf.spill.nta [loc3]=f68,-256
;;
stf.spill.nta [loc2]=f60,-256
stf.spill.nta [loc3]=f52,-256
adds loc0=96*16-80,in0
;;
stf.spill.nta [loc2]=f44,-256
stf.spill.nta [loc3]=f36,-256
adds loc1=96*16-80-128,in0
;;
stf.spill.nta [loc0]=f123,-256
stf.spill.nta [loc1]=f115,-256
;;
stf.spill.nta [loc0]=f107,-256
stf.spill.nta [loc1]=f99,-256
;;
stf.spill.nta [loc0]=f91,-256
stf.spill.nta [loc1]=f83,-256
;;
stf.spill.nta [loc0]=f75,-256
stf.spill.nta [loc1]=f67,-256
;;
stf.spill.nta [loc0]=f59,-256
stf.spill.nta [loc1]=f51,-256
adds loc2=96*16-96,in0
;;
stf.spill.nta [loc0]=f43,-256
stf.spill.nta [loc1]=f35,-256
adds loc3=96*16-96-128,in0
;;
stf.spill.nta [loc2]=f122,-256
stf.spill.nta [loc3]=f114,-256
;;
stf.spill.nta [loc2]=f106,-256
stf.spill.nta [loc3]=f98,-256
;;
stf.spill.nta [loc2]=f90,-256
stf.spill.nta [loc3]=f82,-256
;;
stf.spill.nta [loc2]=f74,-256
stf.spill.nta [loc3]=f66,-256
;;
stf.spill.nta [loc2]=f58,-256
stf.spill.nta [loc3]=f50,-256
adds loc0=96*16-112,in0
;;
stf.spill.nta [loc2]=f42,-256
stf.spill.nta [loc3]=f34,-256
adds loc1=96*16-112-128,in0
;;
stf.spill.nta [loc0]=f121,-256
stf.spill.nta [loc1]=f113,-256
;;
stf.spill.nta [loc0]=f105,-256
stf.spill.nta [loc1]=f97,-256
;;
stf.spill.nta [loc0]=f89,-256
stf.spill.nta [loc1]=f81,-256
;;
stf.spill.nta [loc0]=f73,-256
stf.spill.nta [loc1]=f65,-256
;;
stf.spill.nta [loc0]=f57,-256
stf.spill.nta [loc1]=f49,-256
adds loc2=96*16-128,in0
;;
stf.spill.nta [loc0]=f41,-256
stf.spill.nta [loc1]=f33,-256
adds loc3=96*16-128-128,in0
;;
stf.spill.nta [loc2]=f120,-256
stf.spill.nta [loc3]=f112,-256
;;
stf.spill.nta [loc2]=f104,-256
stf.spill.nta [loc3]=f96,-256
;;
stf.spill.nta [loc2]=f88,-256
stf.spill.nta [loc3]=f80,-256
;;
stf.spill.nta [loc2]=f72,-256
stf.spill.nta [loc3]=f64,-256
;;
stf.spill.nta [loc2]=f56,-256
stf.spill.nta [loc3]=f48,-256
;;
stf.spill.nta [loc2]=f40
stf.spill.nta [loc3]=f32
br.ret.sptk.many rp
END(__ia64_save_fpu)
GLOBAL_ENTRY(__ia64_load_fpu)
alloc r2=ar.pfs,1,2,0,0
adds r3=128,in0
adds r14=256,in0
adds r15=384,in0
mov loc0=512
mov loc1=-1024+16
;;
ldf.fill.nta f32=[in0],loc0
ldf.fill.nta f40=[ r3],loc0
ldf.fill.nta f48=[r14],loc0
ldf.fill.nta f56=[r15],loc0
;;
ldf.fill.nta f64=[in0],loc0
ldf.fill.nta f72=[ r3],loc0
ldf.fill.nta f80=[r14],loc0
ldf.fill.nta f88=[r15],loc0
;;
ldf.fill.nta f96=[in0],loc1
ldf.fill.nta f104=[ r3],loc1
ldf.fill.nta f112=[r14],loc1
ldf.fill.nta f120=[r15],loc1
;;
ldf.fill.nta f33=[in0],loc0
ldf.fill.nta f41=[ r3],loc0
ldf.fill.nta f49=[r14],loc0
ldf.fill.nta f57=[r15],loc0
;;
ldf.fill.nta f65=[in0],loc0
ldf.fill.nta f73=[ r3],loc0
ldf.fill.nta f81=[r14],loc0
ldf.fill.nta f89=[r15],loc0
;;
ldf.fill.nta f97=[in0],loc1
ldf.fill.nta f105=[ r3],loc1
ldf.fill.nta f113=[r14],loc1
ldf.fill.nta f121=[r15],loc1
;;
ldf.fill.nta f34=[in0],loc0
ldf.fill.nta f42=[ r3],loc0
ldf.fill.nta f50=[r14],loc0
ldf.fill.nta f58=[r15],loc0
;;
ldf.fill.nta f66=[in0],loc0
ldf.fill.nta f74=[ r3],loc0
ldf.fill.nta f82=[r14],loc0
ldf.fill.nta f90=[r15],loc0
;;
ldf.fill.nta f98=[in0],loc1
ldf.fill.nta f106=[ r3],loc1
ldf.fill.nta f114=[r14],loc1
ldf.fill.nta f122=[r15],loc1
;;
ldf.fill.nta f35=[in0],loc0
ldf.fill.nta f43=[ r3],loc0
ldf.fill.nta f51=[r14],loc0
ldf.fill.nta f59=[r15],loc0
;;
ldf.fill.nta f67=[in0],loc0
ldf.fill.nta f75=[ r3],loc0
ldf.fill.nta f83=[r14],loc0
ldf.fill.nta f91=[r15],loc0
;;
ldf.fill.nta f99=[in0],loc1
ldf.fill.nta f107=[ r3],loc1
ldf.fill.nta f115=[r14],loc1
ldf.fill.nta f123=[r15],loc1
;;
ldf.fill.nta f36=[in0],loc0
ldf.fill.nta f44=[ r3],loc0
ldf.fill.nta f52=[r14],loc0
ldf.fill.nta f60=[r15],loc0
;;
ldf.fill.nta f68=[in0],loc0
ldf.fill.nta f76=[ r3],loc0
ldf.fill.nta f84=[r14],loc0
ldf.fill.nta f92=[r15],loc0
;;
ldf.fill.nta f100=[in0],loc1
ldf.fill.nta f108=[ r3],loc1
ldf.fill.nta f116=[r14],loc1
ldf.fill.nta f124=[r15],loc1
;;
ldf.fill.nta f37=[in0],loc0
ldf.fill.nta f45=[ r3],loc0
ldf.fill.nta f53=[r14],loc0
ldf.fill.nta f61=[r15],loc0
;;
ldf.fill.nta f69=[in0],loc0
ldf.fill.nta f77=[ r3],loc0
ldf.fill.nta f85=[r14],loc0
ldf.fill.nta f93=[r15],loc0
;;
ldf.fill.nta f101=[in0],loc1
ldf.fill.nta f109=[ r3],loc1
ldf.fill.nta f117=[r14],loc1
ldf.fill.nta f125=[r15],loc1
;;
ldf.fill.nta f38 =[in0],loc0
ldf.fill.nta f46 =[ r3],loc0
ldf.fill.nta f54 =[r14],loc0
ldf.fill.nta f62 =[r15],loc0
;;
ldf.fill.nta f70 =[in0],loc0
ldf.fill.nta f78 =[ r3],loc0
ldf.fill.nta f86 =[r14],loc0
ldf.fill.nta f94 =[r15],loc0
;;
ldf.fill.nta f102=[in0],loc1
ldf.fill.nta f110=[ r3],loc1
ldf.fill.nta f118=[r14],loc1
ldf.fill.nta f126=[r15],loc1
;;
ldf.fill.nta f39 =[in0],loc0
ldf.fill.nta f47 =[ r3],loc0
ldf.fill.nta f55 =[r14],loc0
ldf.fill.nta f63 =[r15],loc0
;;
ldf.fill.nta f71 =[in0],loc0
ldf.fill.nta f79 =[ r3],loc0
ldf.fill.nta f87 =[r14],loc0
ldf.fill.nta f95 =[r15],loc0
;;
ldf.fill.nta f103=[in0]
ldf.fill.nta f111=[ r3]
ldf.fill.nta f119=[r14]
ldf.fill.nta f127=[r15]
br.ret.sptk.many rp
END(__ia64_load_fpu)
GLOBAL_ENTRY(__ia64_init_fpu)
stf.spill [sp]=f0 // M3
mov f32=f0 // F
nop.b 0
ldfps f33,f34=[sp] // M0
ldfps f35,f36=[sp] // M1
mov f37=f0 // F
;;
setf.s f38=r0 // M2
setf.s f39=r0 // M3
mov f40=f0 // F
ldfps f41,f42=[sp] // M0
ldfps f43,f44=[sp] // M1
mov f45=f0 // F
setf.s f46=r0 // M2
setf.s f47=r0 // M3
mov f48=f0 // F
ldfps f49,f50=[sp] // M0
ldfps f51,f52=[sp] // M1
mov f53=f0 // F
setf.s f54=r0 // M2
setf.s f55=r0 // M3
mov f56=f0 // F
ldfps f57,f58=[sp] // M0
ldfps f59,f60=[sp] // M1
mov f61=f0 // F
setf.s f62=r0 // M2
setf.s f63=r0 // M3
mov f64=f0 // F
ldfps f65,f66=[sp] // M0
ldfps f67,f68=[sp] // M1
mov f69=f0 // F
setf.s f70=r0 // M2
setf.s f71=r0 // M3
mov f72=f0 // F
ldfps f73,f74=[sp] // M0
ldfps f75,f76=[sp] // M1
mov f77=f0 // F
setf.s f78=r0 // M2
setf.s f79=r0 // M3
mov f80=f0 // F
ldfps f81,f82=[sp] // M0
ldfps f83,f84=[sp] // M1
mov f85=f0 // F
setf.s f86=r0 // M2
setf.s f87=r0 // M3
mov f88=f0 // F
/*
* When the instructions are cached, it would be faster to initialize
* the remaining registers with simply mov instructions (F-unit).
* This gets the time down to ~29 cycles. However, this would use up
* 33 bundles, whereas continuing with the above pattern yields
* 10 bundles and ~30 cycles.
*/
ldfps f89,f90=[sp] // M0
ldfps f91,f92=[sp] // M1
mov f93=f0 // F
setf.s f94=r0 // M2
setf.s f95=r0 // M3
mov f96=f0 // F
ldfps f97,f98=[sp] // M0
ldfps f99,f100=[sp] // M1
mov f101=f0 // F
setf.s f102=r0 // M2
setf.s f103=r0 // M3
mov f104=f0 // F
ldfps f105,f106=[sp] // M0
ldfps f107,f108=[sp] // M1
mov f109=f0 // F
setf.s f110=r0 // M2
setf.s f111=r0 // M3
mov f112=f0 // F
ldfps f113,f114=[sp] // M0
ldfps f115,f116=[sp] // M1
mov f117=f0 // F
setf.s f118=r0 // M2
setf.s f119=r0 // M3
mov f120=f0 // F
ldfps f121,f122=[sp] // M0
ldfps f123,f124=[sp] // M1
mov f125=f0 // F
setf.s f126=r0 // M2
setf.s f127=r0 // M3
br.ret.sptk.many rp // F
END(__ia64_init_fpu)
/*
* Switch execution mode from virtual to physical
*
* Inputs:
* r16 = new psr to establish
* Output:
* r19 = old virtual address of ar.bsp
* r20 = old virtual address of sp
*
* Note: RSE must already be in enforced lazy mode
*/
GLOBAL_ENTRY(ia64_switch_mode_phys)
{
rsm psr.i | psr.ic // disable interrupts and interrupt collection
mov r15=ip
}
;;
{
flushrs // must be first insn in group
srlz.i
}
;;
mov cr.ipsr=r16 // set new PSR
add r3=1f-ia64_switch_mode_phys,r15
mov r19=ar.bsp
mov r20=sp
mov r14=rp // get return address into a general register
;;
// going to physical mode, use tpa to translate virt->phys
tpa r17=r19
tpa r3=r3
tpa sp=sp
tpa r14=r14
;;
mov r18=ar.rnat // save ar.rnat
mov ar.bspstore=r17 // this steps on ar.rnat
mov cr.iip=r3
mov cr.ifs=r0
;;
mov ar.rnat=r18 // restore ar.rnat
rfi // must be last insn in group
;;
1: mov rp=r14
br.ret.sptk.many rp
END(ia64_switch_mode_phys)
/*
* Switch execution mode from physical to virtual
*
* Inputs:
* r16 = new psr to establish
* r19 = new bspstore to establish
* r20 = new sp to establish
*
* Note: RSE must already be in enforced lazy mode
*/
GLOBAL_ENTRY(ia64_switch_mode_virt)
{
rsm psr.i | psr.ic // disable interrupts and interrupt collection
mov r15=ip
}
;;
{
flushrs // must be first insn in group
srlz.i
}
;;
mov cr.ipsr=r16 // set new PSR
add r3=1f-ia64_switch_mode_virt,r15
mov r14=rp // get return address into a general register
;;
// going to virtual
// - for code addresses, set upper bits of addr to KERNEL_START
// - for stack addresses, copy from input argument
movl r18=KERNEL_START
dep r3=0,r3,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
dep r14=0,r14,KERNEL_TR_PAGE_SHIFT,64-KERNEL_TR_PAGE_SHIFT
mov sp=r20
;;
or r3=r3,r18
or r14=r14,r18
;;
mov r18=ar.rnat // save ar.rnat
mov ar.bspstore=r19 // this steps on ar.rnat
mov cr.iip=r3
mov cr.ifs=r0
;;
mov ar.rnat=r18 // restore ar.rnat
rfi // must be last insn in group
;;
1: mov rp=r14
br.ret.sptk.many rp
END(ia64_switch_mode_virt)
GLOBAL_ENTRY(ia64_delay_loop)
.prologue
{ nop 0 // work around GAS unwind info generation bug...
.save ar.lc,r2
mov r2=ar.lc
.body
;;
mov ar.lc=r32
}
;;
// force loop to be 32-byte aligned (GAS bug means we cannot use .align
// inside function body without corrupting unwind info).
{ nop 0 }
1: br.cloop.sptk.few 1b
;;
mov ar.lc=r2
br.ret.sptk.many rp
END(ia64_delay_loop)
/*
* Return a CPU-local timestamp in nano-seconds. This timestamp is
* NOT synchronized across CPUs its return value must never be
* compared against the values returned on another CPU. The usage in
* kernel/sched.c ensures that.
*
* The return-value of sched_clock() is NOT supposed to wrap-around.
* If it did, it would cause some scheduling hiccups (at the worst).
* Fortunately, with a 64-bit cycle-counter ticking at 100GHz, even
* that would happen only once every 5+ years.
*
* The code below basically calculates:
*
* (ia64_get_itc() * local_cpu_data->nsec_per_cyc) >> IA64_NSEC_PER_CYC_SHIFT
*
* except that the multiplication and the shift are done with 128-bit
* intermediate precision so that we can produce a full 64-bit result.
*/
GLOBAL_ENTRY(ia64_native_sched_clock)
addl r8=THIS_CPU(cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
mov.m r9=ar.itc // fetch cycle-counter (35 cyc)
;;
ldf8 f8=[r8]
;;
setf.sig f9=r9 // certain to stall, so issue it _after_ ldf8...
;;
xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
;;
getf.sig r8=f10 // (5 cyc)
getf.sig r9=f11
;;
shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
br.ret.sptk.many rp
END(ia64_native_sched_clock)
#ifndef CONFIG_PARAVIRT
//unsigned long long
//sched_clock(void) __attribute__((alias("ia64_native_sched_clock")));
.global sched_clock
sched_clock = ia64_native_sched_clock
#endif
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
GLOBAL_ENTRY(cycle_to_cputime)
alloc r16=ar.pfs,1,0,0,0
addl r8=THIS_CPU(cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
;;
ldf8 f8=[r8]
;;
setf.sig f9=r32
;;
xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
;;
getf.sig r8=f10 // (5 cyc)
getf.sig r9=f11
;;
shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
br.ret.sptk.many rp
END(cycle_to_cputime)
#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
GLOBAL_ENTRY(start_kernel_thread)
.prologue
.save rp, r0 // this is the end of the call-chain
.body
alloc r2 = ar.pfs, 0, 0, 2, 0
mov out0 = r9
mov out1 = r11;;
br.call.sptk.many rp = kernel_thread_helper;;
mov out0 = r8
br.call.sptk.many rp = sys_exit;;
1: br.sptk.few 1b // not reached
END(start_kernel_thread)
#ifdef CONFIG_IA64_BRL_EMU
/*
* Assembly routines used by brl_emu.c to set preserved register state.
*/
#define SET_REG(reg) \
GLOBAL_ENTRY(ia64_set_##reg); \
alloc r16=ar.pfs,1,0,0,0; \
mov reg=r32; \
;; \
br.ret.sptk.many rp; \
END(ia64_set_##reg)
SET_REG(b1);
SET_REG(b2);
SET_REG(b3);
SET_REG(b4);
SET_REG(b5);
#endif /* CONFIG_IA64_BRL_EMU */
#ifdef CONFIG_SMP
#ifdef CONFIG_HOTPLUG_CPU
GLOBAL_ENTRY(ia64_jump_to_sal)
alloc r16=ar.pfs,1,0,0,0;;
rsm psr.i | psr.ic
{
flushrs
srlz.i
}
tpa r25=in0
movl r18=tlb_purge_done;;
DATA_VA_TO_PA(r18);;
mov b1=r18 // Return location
movl r18=ia64_do_tlb_purge;;
DATA_VA_TO_PA(r18);;
mov b2=r18 // doing tlb_flush work
mov ar.rsc=0 // Put RSE in enforced lazy, LE mode
movl r17=1f;;
DATA_VA_TO_PA(r17);;
mov cr.iip=r17
movl r16=SAL_PSR_BITS_TO_SET;;
mov cr.ipsr=r16
mov cr.ifs=r0;;
rfi;; // note: this unmask MCA/INIT (psr.mc)
1:
/*
* Invalidate all TLB data/inst
*/
br.sptk.many b2;; // jump to tlb purge code
tlb_purge_done:
RESTORE_REGION_REGS(r25, r17,r18,r19);;
RESTORE_REG(b0, r25, r17);;
RESTORE_REG(b1, r25, r17);;
RESTORE_REG(b2, r25, r17);;
RESTORE_REG(b3, r25, r17);;
RESTORE_REG(b4, r25, r17);;
RESTORE_REG(b5, r25, r17);;
ld8 r1=[r25],0x08;;
ld8 r12=[r25],0x08;;
ld8 r13=[r25],0x08;;
RESTORE_REG(ar.fpsr, r25, r17);;
RESTORE_REG(ar.pfs, r25, r17);;
RESTORE_REG(ar.rnat, r25, r17);;
RESTORE_REG(ar.unat, r25, r17);;
RESTORE_REG(ar.bspstore, r25, r17);;
RESTORE_REG(cr.dcr, r25, r17);;
RESTORE_REG(cr.iva, r25, r17);;
RESTORE_REG(cr.pta, r25, r17);;
srlz.d;; // required not to violate RAW dependency
RESTORE_REG(cr.itv, r25, r17);;
RESTORE_REG(cr.pmv, r25, r17);;
RESTORE_REG(cr.cmcv, r25, r17);;
RESTORE_REG(cr.lrr0, r25, r17);;
RESTORE_REG(cr.lrr1, r25, r17);;
ld8 r4=[r25],0x08;;
ld8 r5=[r25],0x08;;
ld8 r6=[r25],0x08;;
ld8 r7=[r25],0x08;;
ld8 r17=[r25],0x08;;
mov pr=r17,-1;;
RESTORE_REG(ar.lc, r25, r17);;
/*
* Now Restore floating point regs
*/
ldf.fill.nta f2=[r25],16;;
ldf.fill.nta f3=[r25],16;;
ldf.fill.nta f4=[r25],16;;
ldf.fill.nta f5=[r25],16;;
ldf.fill.nta f16=[r25],16;;
ldf.fill.nta f17=[r25],16;;
ldf.fill.nta f18=[r25],16;;
ldf.fill.nta f19=[r25],16;;
ldf.fill.nta f20=[r25],16;;
ldf.fill.nta f21=[r25],16;;
ldf.fill.nta f22=[r25],16;;
ldf.fill.nta f23=[r25],16;;
ldf.fill.nta f24=[r25],16;;
ldf.fill.nta f25=[r25],16;;
ldf.fill.nta f26=[r25],16;;
ldf.fill.nta f27=[r25],16;;
ldf.fill.nta f28=[r25],16;;
ldf.fill.nta f29=[r25],16;;
ldf.fill.nta f30=[r25],16;;
ldf.fill.nta f31=[r25],16;;
/*
* Now that we have done all the register restores
* we are now ready for the big DIVE to SAL Land
*/
ssm psr.ic;;
srlz.d;;
br.ret.sptk.many b0;;
END(ia64_jump_to_sal)
#endif /* CONFIG_HOTPLUG_CPU */
#endif /* CONFIG_SMP */
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