mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Tony Luck](/assets/img/avatar_default.png)
Itanium processors can handle some misaligned data accesses. They also provide a mode where all such accesses are forced to trap. The kernel was schizophrenic about use of this mode: * Base kernel code ran in permissive mode where the only traps generated were from those cases that the h/w could not handle. * Interrupt, syscall and trap code ran in strict mode where all unaligned accesses caused traps to the 0x5a00 unaligned reference vector. Use strict alignment checking throughout the kernel, but make sure that we continue to let user mode use more relaxed mode as the default. Signed-off-by: Tony Luck <tony.luck@intel.com>
1312 lines
31 KiB
ArmAsm
1312 lines
31 KiB
ArmAsm
/*
|
|
* 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
|
|
|
|
.section __special_page_section,"ax"
|
|
|
|
.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"
|
|
|
|
.section .text.head,"ax"
|
|
|
|
.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(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(sched_clock)
|
|
|
|
#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
|
|
/*
|
|
* This routine handles spinlock contention. It uses a non-standard calling
|
|
* convention to avoid converting leaf routines into interior routines. Because
|
|
* of this special convention, there are several restrictions:
|
|
*
|
|
* - do not use gp relative variables, this code is called from the kernel
|
|
* and from modules, r1 is undefined.
|
|
* - do not use stacked registers, the caller owns them.
|
|
* - do not use the scratch stack space, the caller owns it.
|
|
* - do not use any registers other than the ones listed below
|
|
*
|
|
* Inputs:
|
|
* ar.pfs - saved CFM of caller
|
|
* ar.ccv - 0 (and available for use)
|
|
* r27 - flags from spin_lock_irqsave or 0. Must be preserved.
|
|
* r28 - available for use.
|
|
* r29 - available for use.
|
|
* r30 - available for use.
|
|
* r31 - address of lock, available for use.
|
|
* b6 - return address
|
|
* p14 - available for use.
|
|
* p15 - used to track flag status.
|
|
*
|
|
* If you patch this code to use more registers, do not forget to update
|
|
* the clobber lists for spin_lock() in arch/ia64/include/asm/spinlock.h.
|
|
*/
|
|
|
|
#if (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
|
|
|
|
GLOBAL_ENTRY(ia64_spinlock_contention_pre3_4)
|
|
.prologue
|
|
.save ar.pfs, r0 // this code effectively has a zero frame size
|
|
.save rp, r28
|
|
.body
|
|
nop 0
|
|
tbit.nz p15,p0=r27,IA64_PSR_I_BIT
|
|
.restore sp // pop existing prologue after next insn
|
|
mov b6 = r28
|
|
.prologue
|
|
.save ar.pfs, r0
|
|
.altrp b6
|
|
.body
|
|
;;
|
|
(p15) ssm psr.i // reenable interrupts if they were on
|
|
// DavidM says that srlz.d is slow and is not required in this case
|
|
.wait:
|
|
// exponential backoff, kdb, lockmeter etc. go in here
|
|
hint @pause
|
|
ld4 r30=[r31] // don't use ld4.bias; if it's contended, we won't write the word
|
|
nop 0
|
|
;;
|
|
cmp4.ne p14,p0=r30,r0
|
|
(p14) br.cond.sptk.few .wait
|
|
(p15) rsm psr.i // disable interrupts if we reenabled them
|
|
br.cond.sptk.few b6 // lock is now free, try to acquire
|
|
.global ia64_spinlock_contention_pre3_4_end // for kernprof
|
|
ia64_spinlock_contention_pre3_4_end:
|
|
END(ia64_spinlock_contention_pre3_4)
|
|
|
|
#else
|
|
|
|
GLOBAL_ENTRY(ia64_spinlock_contention)
|
|
.prologue
|
|
.altrp b6
|
|
.body
|
|
tbit.nz p15,p0=r27,IA64_PSR_I_BIT
|
|
;;
|
|
.wait:
|
|
(p15) ssm psr.i // reenable interrupts if they were on
|
|
// DavidM says that srlz.d is slow and is not required in this case
|
|
.wait2:
|
|
// exponential backoff, kdb, lockmeter etc. go in here
|
|
hint @pause
|
|
ld4 r30=[r31] // don't use ld4.bias; if it's contended, we won't write the word
|
|
;;
|
|
cmp4.ne p14,p0=r30,r0
|
|
mov r30 = 1
|
|
(p14) br.cond.sptk.few .wait2
|
|
(p15) rsm psr.i // disable interrupts if we reenabled them
|
|
;;
|
|
cmpxchg4.acq r30=[r31], r30, ar.ccv
|
|
;;
|
|
cmp4.ne p14,p0=r0,r30
|
|
(p14) br.cond.sptk.few .wait
|
|
|
|
br.ret.sptk.many b6 // lock is now taken
|
|
END(ia64_spinlock_contention)
|
|
|
|
#endif
|
|
|
|
#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;;
|
|
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 */
|