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linux/arch/ia64/kernel/pal.S
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

303 lines
7.5 KiB
ArmAsm
Raw Blame History

/*
* PAL Firmware support
* IA-64 Processor Programmers Reference Vol 2
*
* Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
* Copyright (C) 1999-2001, 2003 Hewlett-Packard Co
* David Mosberger <davidm@hpl.hp.com>
* Stephane Eranian <eranian@hpl.hp.com>
*
* 05/22/2000 eranian Added support for stacked register calls
* 05/24/2000 eranian Added support for physical mode static calls
*/
#include <asm/asmmacro.h>
#include <asm/processor.h>
.data
pal_entry_point:
data8 ia64_pal_default_handler
.text
/*
* Set the PAL entry point address. This could be written in C code, but we do it here
* to keep it all in one module (besides, it's so trivial that it's
* not a big deal).
*
* in0 Address of the PAL entry point (text address, NOT a function descriptor).
*/
GLOBAL_ENTRY(ia64_pal_handler_init)
alloc r3=ar.pfs,1,0,0,0
movl r2=pal_entry_point
;;
st8 [r2]=in0
br.ret.sptk.many rp
END(ia64_pal_handler_init)
/*
* Default PAL call handler. This needs to be coded in assembly because it uses
* the static calling convention, i.e., the RSE may not be used and calls are
* done via "br.cond" (not "br.call").
*/
GLOBAL_ENTRY(ia64_pal_default_handler)
mov r8=-1
br.cond.sptk.many rp
END(ia64_pal_default_handler)
/*
* Make a PAL call using the static calling convention.
*
* in0 Index of PAL service
* in1 - in3 Remaining PAL arguments
* in4 1 ==> clear psr.ic, 0 ==> don't clear psr.ic
*
*/
GLOBAL_ENTRY(ia64_pal_call_static)
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(5)
alloc loc1 = ar.pfs,5,5,0,0
movl loc2 = pal_entry_point
1: {
mov r28 = in0
mov r29 = in1
mov r8 = ip
}
;;
ld8 loc2 = [loc2] // loc2 <- entry point
tbit.nz p6,p7 = in4, 0
adds r8 = 1f-1b,r8
mov loc4=ar.rsc // save RSE configuration
;;
mov ar.rsc=0 // put RSE in enforced lazy, LE mode
mov loc3 = psr
mov loc0 = rp
.body
mov r30 = in2
(p6) rsm psr.i | psr.ic
mov r31 = in3
mov b7 = loc2
(p7) rsm psr.i
;;
(p6) srlz.i
mov rp = r8
br.cond.sptk.many b7
1: mov psr.l = loc3
mov ar.rsc = loc4 // restore RSE configuration
mov ar.pfs = loc1
mov rp = loc0
;;
srlz.d // seralize restoration of psr.l
br.ret.sptk.many b0
END(ia64_pal_call_static)
/*
* Make a PAL call using the stacked registers calling convention.
*
* Inputs:
* in0 Index of PAL service
* in2 - in3 Remaning PAL arguments
*/
GLOBAL_ENTRY(ia64_pal_call_stacked)
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(4)
alloc loc1 = ar.pfs,4,4,4,0
movl loc2 = pal_entry_point
mov r28 = in0 // Index MUST be copied to r28
mov out0 = in0 // AND in0 of PAL function
mov loc0 = rp
.body
;;
ld8 loc2 = [loc2] // loc2 <- entry point
mov out1 = in1
mov out2 = in2
mov out3 = in3
mov loc3 = psr
;;
rsm psr.i
mov b7 = loc2
;;
br.call.sptk.many rp=b7 // now make the call
.ret0: mov psr.l = loc3
mov ar.pfs = loc1
mov rp = loc0
;;
srlz.d // serialize restoration of psr.l
br.ret.sptk.many b0
END(ia64_pal_call_stacked)
/*
* Make a physical mode PAL call using the static registers calling convention.
*
* Inputs:
* in0 Index of PAL service
* in2 - in3 Remaning PAL arguments
*
* PSR_LP, PSR_TB, PSR_ID, PSR_DA are never set by the kernel.
* So we don't need to clear them.
*/
#define PAL_PSR_BITS_TO_CLEAR \
(IA64_PSR_I | IA64_PSR_IT | IA64_PSR_DT | IA64_PSR_DB | IA64_PSR_RT | \
IA64_PSR_DD | IA64_PSR_SS | IA64_PSR_RI | IA64_PSR_ED | \
IA64_PSR_DFL | IA64_PSR_DFH)
#define PAL_PSR_BITS_TO_SET \
(IA64_PSR_BN)
GLOBAL_ENTRY(ia64_pal_call_phys_static)
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(4)
alloc loc1 = ar.pfs,4,7,0,0
movl loc2 = pal_entry_point
1: {
mov r28 = in0 // copy procedure index
mov r8 = ip // save ip to compute branch
mov loc0 = rp // save rp
}
.body
;;
ld8 loc2 = [loc2] // loc2 <- entry point
mov r29 = in1 // first argument
mov r30 = in2 // copy arg2
mov r31 = in3 // copy arg3
;;
mov loc3 = psr // save psr
adds r8 = 1f-1b,r8 // calculate return address for call
;;
mov loc4=ar.rsc // save RSE configuration
dep.z loc2=loc2,0,61 // convert pal entry point to physical
tpa r8=r8 // convert rp to physical
;;
mov b7 = loc2 // install target to branch reg
mov ar.rsc=0 // put RSE in enforced lazy, LE mode
movl r16=PAL_PSR_BITS_TO_CLEAR
movl r17=PAL_PSR_BITS_TO_SET
;;
or loc3=loc3,r17 // add in psr the bits to set
;;
andcm r16=loc3,r16 // removes bits to clear from psr
br.call.sptk.many rp=ia64_switch_mode_phys
.ret1: mov rp = r8 // install return address (physical)
mov loc5 = r19
mov loc6 = r20
br.cond.sptk.many b7
1:
mov ar.rsc=0 // put RSE in enforced lazy, LE mode
mov r16=loc3 // r16= original psr
mov r19=loc5
mov r20=loc6
br.call.sptk.many rp=ia64_switch_mode_virt // return to virtual mode
.ret2:
mov psr.l = loc3 // restore init PSR
mov ar.pfs = loc1
mov rp = loc0
;;
mov ar.rsc=loc4 // restore RSE configuration
srlz.d // seralize restoration of psr.l
br.ret.sptk.many b0
END(ia64_pal_call_phys_static)
/*
* Make a PAL call using the stacked registers in physical mode.
*
* Inputs:
* in0 Index of PAL service
* in2 - in3 Remaning PAL arguments
*/
GLOBAL_ENTRY(ia64_pal_call_phys_stacked)
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(5)
alloc loc1 = ar.pfs,5,7,4,0
movl loc2 = pal_entry_point
1: {
mov r28 = in0 // copy procedure index
mov loc0 = rp // save rp
}
.body
;;
ld8 loc2 = [loc2] // loc2 <- entry point
mov out0 = in0 // first argument
mov out1 = in1 // copy arg2
mov out2 = in2 // copy arg3
mov out3 = in3 // copy arg3
;;
mov loc3 = psr // save psr
;;
mov loc4=ar.rsc // save RSE configuration
dep.z loc2=loc2,0,61 // convert pal entry point to physical
;;
mov ar.rsc=0 // put RSE in enforced lazy, LE mode
movl r16=PAL_PSR_BITS_TO_CLEAR
movl r17=PAL_PSR_BITS_TO_SET
;;
or loc3=loc3,r17 // add in psr the bits to set
mov b7 = loc2 // install target to branch reg
;;
andcm r16=loc3,r16 // removes bits to clear from psr
br.call.sptk.many rp=ia64_switch_mode_phys
.ret6:
mov loc5 = r19
mov loc6 = r20
br.call.sptk.many rp=b7 // now make the call
.ret7:
mov ar.rsc=0 // put RSE in enforced lazy, LE mode
mov r16=loc3 // r16= original psr
mov r19=loc5
mov r20=loc6
br.call.sptk.many rp=ia64_switch_mode_virt // return to virtual mode
.ret8: mov psr.l = loc3 // restore init PSR
mov ar.pfs = loc1
mov rp = loc0
;;
mov ar.rsc=loc4 // restore RSE configuration
srlz.d // seralize restoration of psr.l
br.ret.sptk.many b0
END(ia64_pal_call_phys_stacked)
/*
* Save scratch fp scratch regs which aren't saved in pt_regs already (fp10-fp15).
*
* NOTE: We need to do this since firmware (SAL and PAL) may use any of the scratch
* regs fp-low partition.
*
* Inputs:
* in0 Address of stack storage for fp regs
*/
GLOBAL_ENTRY(ia64_save_scratch_fpregs)
alloc r3=ar.pfs,1,0,0,0
add r2=16,in0
;;
stf.spill [in0] = f10,32
stf.spill [r2] = f11,32
;;
stf.spill [in0] = f12,32
stf.spill [r2] = f13,32
;;
stf.spill [in0] = f14,32
stf.spill [r2] = f15,32
br.ret.sptk.many rp
END(ia64_save_scratch_fpregs)
/*
* Load scratch fp scratch regs (fp10-fp15)
*
* Inputs:
* in0 Address of stack storage for fp regs
*/
GLOBAL_ENTRY(ia64_load_scratch_fpregs)
alloc r3=ar.pfs,1,0,0,0
add r2=16,in0
;;
ldf.fill f10 = [in0],32
ldf.fill f11 = [r2],32
;;
ldf.fill f12 = [in0],32
ldf.fill f13 = [r2],32
;;
ldf.fill f14 = [in0],32
ldf.fill f15 = [r2],32
br.ret.sptk.many rp
END(ia64_load_scratch_fpregs)
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