3 * IA-64 Processor Programmers Reference Vol 2
5 * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
6 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
7 * Copyright (C) 1999-2001, 2003 Hewlett-Packard Co
8 * David Mosberger <davidm@hpl.hp.com>
9 * Stephane Eranian <eranian@hpl.hp.com>
11 * 05/22/2000 eranian Added support for stacked register calls
12 * 05/24/2000 eranian Added support for physical mode static calls
15 #include <asm/asmmacro.h>
16 #include <asm/processor.h>
20 data8 ia64_pal_default_handler
24 * Set the PAL entry point address. This could be written in C code, but we do it here
25 * to keep it all in one module (besides, it's so trivial that it's
28 * in0 Address of the PAL entry point (text address, NOT a function descriptor).
30 GLOBAL_ENTRY(ia64_pal_handler_init)
31 alloc r3=ar.pfs,1,0,0,0
32 movl r2=pal_entry_point
36 END(ia64_pal_handler_init)
39 * Default PAL call handler. This needs to be coded in assembly because it uses
40 * the static calling convention, i.e., the RSE may not be used and calls are
41 * done via "br.cond" (not "br.call").
43 GLOBAL_ENTRY(ia64_pal_default_handler)
46 END(ia64_pal_default_handler)
49 * Make a PAL call using the static calling convention.
51 * in0 Index of PAL service
52 * in1 - in3 Remaining PAL arguments
53 * in4 1 ==> clear psr.ic, 0 ==> don't clear psr.ic
56 GLOBAL_ENTRY(ia64_pal_call_static)
57 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(5)
58 alloc loc1 = ar.pfs,5,5,0,0
59 movl loc2 = pal_entry_point
66 ld8 loc2 = [loc2] // loc2 <- entry point
67 tbit.nz p6,p7 = in4, 0
69 mov loc4=ar.rsc // save RSE configuration
71 mov ar.rsc=0 // put RSE in enforced lazy, LE mode
77 (p6) rsm psr.i | psr.ic
87 mov ar.rsc = loc4 // restore RSE configuration
91 srlz.d // seralize restoration of psr.l
93 END(ia64_pal_call_static)
96 * Make a PAL call using the stacked registers calling convention.
99 * in0 Index of PAL service
100 * in2 - in3 Remaning PAL arguments
102 GLOBAL_ENTRY(ia64_pal_call_stacked)
103 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(4)
104 alloc loc1 = ar.pfs,4,4,4,0
105 movl loc2 = pal_entry_point
107 mov r28 = in0 // Index MUST be copied to r28
108 mov out0 = in0 // AND in0 of PAL function
112 ld8 loc2 = [loc2] // loc2 <- entry point
121 br.call.sptk.many rp=b7 // now make the call
122 .ret0: mov psr.l = loc3
126 srlz.d // serialize restoration of psr.l
128 END(ia64_pal_call_stacked)
131 * Make a physical mode PAL call using the static registers calling convention.
134 * in0 Index of PAL service
135 * in2 - in3 Remaning PAL arguments
137 * PSR_LP, PSR_TB, PSR_ID, PSR_DA are never set by the kernel.
138 * So we don't need to clear them.
140 #define PAL_PSR_BITS_TO_CLEAR \
141 (IA64_PSR_I | IA64_PSR_IT | IA64_PSR_DT | IA64_PSR_DB | IA64_PSR_RT | \
142 IA64_PSR_DD | IA64_PSR_SS | IA64_PSR_RI | IA64_PSR_ED | \
143 IA64_PSR_DFL | IA64_PSR_DFH)
145 #define PAL_PSR_BITS_TO_SET \
149 GLOBAL_ENTRY(ia64_pal_call_phys_static)
150 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(4)
151 alloc loc1 = ar.pfs,4,7,0,0
152 movl loc2 = pal_entry_point
154 mov r28 = in0 // copy procedure index
155 mov r8 = ip // save ip to compute branch
156 mov loc0 = rp // save rp
160 ld8 loc2 = [loc2] // loc2 <- entry point
161 mov r29 = in1 // first argument
162 mov r30 = in2 // copy arg2
163 mov r31 = in3 // copy arg3
165 mov loc3 = psr // save psr
166 adds r8 = 1f-1b,r8 // calculate return address for call
168 mov loc4=ar.rsc // save RSE configuration
169 dep.z loc2=loc2,0,61 // convert pal entry point to physical
170 tpa r8=r8 // convert rp to physical
172 mov b7 = loc2 // install target to branch reg
173 mov ar.rsc=0 // put RSE in enforced lazy, LE mode
174 movl r16=PAL_PSR_BITS_TO_CLEAR
175 movl r17=PAL_PSR_BITS_TO_SET
177 or loc3=loc3,r17 // add in psr the bits to set
179 andcm r16=loc3,r16 // removes bits to clear from psr
180 br.call.sptk.many rp=ia64_switch_mode_phys
181 .ret1: mov rp = r8 // install return address (physical)
186 mov ar.rsc=0 // put RSE in enforced lazy, LE mode
187 mov r16=loc3 // r16= original psr
190 br.call.sptk.many rp=ia64_switch_mode_virt // return to virtual mode
192 mov psr.l = loc3 // restore init PSR
197 mov ar.rsc=loc4 // restore RSE configuration
198 srlz.d // seralize restoration of psr.l
200 END(ia64_pal_call_phys_static)
203 * Make a PAL call using the stacked registers in physical mode.
206 * in0 Index of PAL service
207 * in2 - in3 Remaning PAL arguments
209 GLOBAL_ENTRY(ia64_pal_call_phys_stacked)
210 .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(5)
211 alloc loc1 = ar.pfs,5,7,4,0
212 movl loc2 = pal_entry_point
214 mov r28 = in0 // copy procedure index
215 mov loc0 = rp // save rp
219 ld8 loc2 = [loc2] // loc2 <- entry point
220 mov out0 = in0 // first argument
221 mov out1 = in1 // copy arg2
222 mov out2 = in2 // copy arg3
223 mov out3 = in3 // copy arg3
225 mov loc3 = psr // save psr
227 mov loc4=ar.rsc // save RSE configuration
228 dep.z loc2=loc2,0,61 // convert pal entry point to physical
230 mov ar.rsc=0 // put RSE in enforced lazy, LE mode
231 movl r16=PAL_PSR_BITS_TO_CLEAR
232 movl r17=PAL_PSR_BITS_TO_SET
234 or loc3=loc3,r17 // add in psr the bits to set
235 mov b7 = loc2 // install target to branch reg
237 andcm r16=loc3,r16 // removes bits to clear from psr
238 br.call.sptk.many rp=ia64_switch_mode_phys
242 br.call.sptk.many rp=b7 // now make the call
244 mov ar.rsc=0 // put RSE in enforced lazy, LE mode
245 mov r16=loc3 // r16= original psr
248 br.call.sptk.many rp=ia64_switch_mode_virt // return to virtual mode
250 .ret8: mov psr.l = loc3 // restore init PSR
254 mov ar.rsc=loc4 // restore RSE configuration
255 srlz.d // seralize restoration of psr.l
257 END(ia64_pal_call_phys_stacked)
260 * Save scratch fp scratch regs which aren't saved in pt_regs already (fp10-fp15).
262 * NOTE: We need to do this since firmware (SAL and PAL) may use any of the scratch
263 * regs fp-low partition.
266 * in0 Address of stack storage for fp regs
268 GLOBAL_ENTRY(ia64_save_scratch_fpregs)
269 alloc r3=ar.pfs,1,0,0,0
272 stf.spill [in0] = f10,32
273 stf.spill [r2] = f11,32
275 stf.spill [in0] = f12,32
276 stf.spill [r2] = f13,32
278 stf.spill [in0] = f14,32
279 stf.spill [r2] = f15,32
281 END(ia64_save_scratch_fpregs)
284 * Load scratch fp scratch regs (fp10-fp15)
287 * in0 Address of stack storage for fp regs
289 GLOBAL_ENTRY(ia64_load_scratch_fpregs)
290 alloc r3=ar.pfs,1,0,0,0
293 ldf.fill f10 = [in0],32
294 ldf.fill f11 = [r2],32
296 ldf.fill f12 = [in0],32
297 ldf.fill f13 = [r2],32
299 ldf.fill f14 = [in0],32
300 ldf.fill f15 = [r2],32
302 END(ia64_load_scratch_fpregs)