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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * 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>
+#include <asm/export.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
+ */
+GLOBAL_ENTRY(ia64_pal_call_static)
+ .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(4)
+ alloc loc1 = ar.pfs,4,5,0,0
+ movl loc2 = pal_entry_point
+1: {
+ mov r28 = in0
+ mov r29 = in1
+ mov r8 = ip
+ }
+ ;;
+ ld8 loc2 = [loc2] // loc2 <- entry point
+ 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
+
+ mov r31 = in3
+ mov b7 = loc2
+
+ rsm psr.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 // serialize restoration of psr.l
+ br.ret.sptk.many b0
+END(ia64_pal_call_static)
+EXPORT_SYMBOL(ia64_pal_call_static)
+
+/*
+ * Make a PAL call using the stacked registers calling convention.
+ *
+ * Inputs:
+ * in0 Index of PAL service
+ * in2 - in3 Remaining 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)
+EXPORT_SYMBOL(ia64_pal_call_stacked)
+
+/*
+ * Make a physical mode PAL call using the static registers calling convention.
+ *
+ * Inputs:
+ * in0 Index of PAL service
+ * in2 - in3 Remaining 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
+ 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
+ mov psr.l = loc3 // restore init PSR
+
+ mov ar.pfs = loc1
+ mov rp = loc0
+ ;;
+ mov ar.rsc=loc4 // restore RSE configuration
+ srlz.d // serialize restoration of psr.l
+ br.ret.sptk.many b0
+END(ia64_pal_call_phys_static)
+EXPORT_SYMBOL(ia64_pal_call_phys_static)
+
+/*
+ * Make a PAL call using the stacked registers in physical mode.
+ *
+ * Inputs:
+ * in0 Index of PAL service
+ * in2 - in3 Remaining 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 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
+
+ mov out0 = in0 // first argument
+ mov out1 = in1 // copy arg2
+ mov out2 = in2 // copy arg3
+ mov out3 = in3 // copy arg3
+ mov loc5 = r19
+ mov loc6 = r20
+
+ br.call.sptk.many rp=b7 // now make the call
+
+ 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
+
+ mov psr.l = loc3 // restore init PSR
+ mov ar.pfs = loc1
+ mov rp = loc0
+ ;;
+ mov ar.rsc=loc4 // restore RSE configuration
+ srlz.d // serialize restoration of psr.l
+ br.ret.sptk.many b0
+END(ia64_pal_call_phys_stacked)
+EXPORT_SYMBOL(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)
+EXPORT_SYMBOL(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)
+EXPORT_SYMBOL(ia64_load_scratch_fpregs)
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