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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 | /* SPDX-License-Identifier: GPL-2.0 */ /* * S390 64-bit swsusp implementation * * Copyright IBM Corp. 2009 * * Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com> * Michael Holzheu <holzheu@linux.vnet.ibm.com> */ #include <linux/linkage.h> #include <asm/page.h> #include <asm/ptrace.h> #include <asm/thread_info.h> #include <asm/asm-offsets.h> #include <asm/nospec-insn.h> #include <asm/sigp.h> /* * Save register context in absolute 0 lowcore and call swsusp_save() to * create in-memory kernel image. The context is saved in the designated * "store status" memory locations (see POP). * We return from this function twice. The first time during the suspend to * disk process. The second time via the swsusp_arch_resume() function * (see below) in the resume process. * This function runs with disabled interrupts. */ GEN_BR_THUNK %r14 .section .text ENTRY(swsusp_arch_suspend) lg %r1,__LC_NODAT_STACK stmg %r6,%r15,__SF_GPRS(%r1) aghi %r1,-STACK_FRAME_OVERHEAD stg %r15,__SF_BACKCHAIN(%r1) lgr %r15,%r1 /* Store FPU registers */ brasl %r14,save_fpu_regs /* Deactivate DAT */ stnsm __SF_EMPTY(%r15),0xfb /* Store prefix register on stack */ stpx __SF_EMPTY(%r15) /* Save prefix register contents for lowcore copy */ llgf %r10,__SF_EMPTY(%r15) /* Get pointer to save area */ lghi %r1,0x1000 /* Save CPU address */ stap __LC_EXT_CPU_ADDR(%r0) /* Store registers */ mvc 0x318(4,%r1),__SF_EMPTY(%r15) /* move prefix to lowcore */ stam %a0,%a15,0x340(%r1) /* store access registers */ stctg %c0,%c15,0x380(%r1) /* store control registers */ stmg %r0,%r15,0x280(%r1) /* store general registers */ stpt 0x328(%r1) /* store timer */ stck __SF_EMPTY(%r15) /* store clock */ stckc 0x330(%r1) /* store clock comparator */ /* Update cputime accounting before going to sleep */ lg %r0,__LC_LAST_UPDATE_TIMER slg %r0,0x328(%r1) alg %r0,__LC_SYSTEM_TIMER stg %r0,__LC_SYSTEM_TIMER mvc __LC_LAST_UPDATE_TIMER(8),0x328(%r1) lg %r0,__LC_LAST_UPDATE_CLOCK slg %r0,__SF_EMPTY(%r15) alg %r0,__LC_STEAL_TIMER stg %r0,__LC_STEAL_TIMER mvc __LC_LAST_UPDATE_CLOCK(8),__SF_EMPTY(%r15) /* Activate DAT */ stosm __SF_EMPTY(%r15),0x04 /* Set prefix page to zero */ xc __SF_EMPTY(4,%r15),__SF_EMPTY(%r15) spx __SF_EMPTY(%r15) /* Save absolute zero pages */ larl %r2,suspend_zero_pages lg %r2,0(%r2) lghi %r4,0 lghi %r3,2*PAGE_SIZE lghi %r5,2*PAGE_SIZE 1: mvcle %r2,%r4,0 jo 1b /* Copy lowcore to absolute zero lowcore */ lghi %r2,0 lgr %r4,%r10 lghi %r3,2*PAGE_SIZE lghi %r5,2*PAGE_SIZE 1: mvcle %r2,%r4,0 jo 1b /* Save image */ brasl %r14,swsusp_save /* Restore prefix register and return */ lghi %r1,0x1000 spx 0x318(%r1) lmg %r6,%r15,STACK_FRAME_OVERHEAD + __SF_GPRS(%r15) lghi %r2,0 BR_EX %r14 ENDPROC(swsusp_arch_suspend) /* * Restore saved memory image to correct place and restore register context. * Then we return to the function that called swsusp_arch_suspend(). * swsusp_arch_resume() runs with disabled interrupts. */ ENTRY(swsusp_arch_resume) stmg %r6,%r15,__SF_GPRS(%r15) lgr %r1,%r15 aghi %r15,-STACK_FRAME_OVERHEAD stg %r1,__SF_BACKCHAIN(%r15) /* Make all free pages stable */ lghi %r2,1 brasl %r14,arch_set_page_states /* Set prefix page to zero */ xc __SF_EMPTY(4,%r15),__SF_EMPTY(%r15) spx __SF_EMPTY(%r15) /* Deactivate DAT */ stnsm __SF_EMPTY(%r15),0xfb /* Restore saved image */ larl %r1,restore_pblist lg %r1,0(%r1) ltgr %r1,%r1 jz 2f 0: lg %r2,8(%r1) lg %r4,0(%r1) iske %r0,%r4 lghi %r3,PAGE_SIZE lghi %r5,PAGE_SIZE 1: mvcle %r2,%r4,0 jo 1b lg %r2,8(%r1) sske %r0,%r2 lg %r1,16(%r1) ltgr %r1,%r1 jnz 0b 2: ptlb /* flush tlb */ /* Reset System */ larl %r1,.Lnew_pgm_check_psw epsw %r2,%r3 stm %r2,%r3,0(%r1) mvc __LC_PGM_NEW_PSW(16,%r0),0(%r1) larl %r1,__swsusp_reset_dma lg %r1,0(%r1) BASR_EX %r14,%r1 larl %r1,smp_cpu_mt_shift icm %r1,15,0(%r1) jz smt_done llgfr %r1,%r1 smt_loop: sigp %r1,%r0,SIGP_SET_MULTI_THREADING brc 8,smt_done /* accepted */ brc 2,smt_loop /* busy, try again */ smt_done: larl %r1,.Lnew_pgm_check_psw lpswe 0(%r1) pgm_check_entry: /* Switch to original suspend CPU */ larl %r1,.Lresume_cpu /* Resume CPU address: r2 */ stap 0(%r1) llgh %r2,0(%r1) llgh %r1,__LC_EXT_CPU_ADDR(%r0) /* Suspend CPU address: r1 */ cgr %r1,%r2 je restore_registers /* r1 = r2 -> nothing to do */ larl %r4,.Lrestart_suspend_psw /* Set new restart PSW */ mvc __LC_RST_NEW_PSW(16,%r0),0(%r4) 3: sigp %r9,%r1,SIGP_INITIAL_CPU_RESET /* sigp initial cpu reset */ brc 8,4f /* accepted */ brc 2,3b /* busy, try again */ /* Suspend CPU not available -> panic */ larl %r15,init_thread_union+THREAD_SIZE-STACK_FRAME_OVERHEAD larl %r2,.Lpanic_string brasl %r14,sclp_early_printk_force larl %r3,.Ldisabled_wait_31 lpsw 0(%r3) 4: /* Switch to suspend CPU */ sigp %r9,%r1,SIGP_RESTART /* sigp restart to suspend CPU */ brc 2,4b /* busy, try again */ 5: sigp %r9,%r2,SIGP_STOP /* sigp stop to current resume CPU */ brc 2,5b /* busy, try again */ 6: j 6b restart_suspend: larl %r1,.Lresume_cpu llgh %r2,0(%r1) 7: sigp %r9,%r2,SIGP_SENSE /* sigp sense, wait for resume CPU */ brc 8,7b /* accepted, status 0, still running */ brc 2,7b /* busy, try again */ tmll %r9,0x40 /* Test if resume CPU is stopped */ jz 7b restore_registers: /* Restore registers */ lghi %r13,0x1000 /* %r1 = pointer to save area */ /* Ignore time spent in suspended state. */ llgf %r1,0x318(%r13) stck __LC_LAST_UPDATE_CLOCK(%r1) spt 0x328(%r13) /* reprogram timer */ //sckc 0x330(%r13) /* set clock comparator */ lctlg %c0,%c15,0x380(%r13) /* load control registers */ lam %a0,%a15,0x340(%r13) /* load access registers */ /* Load old stack */ lg %r15,0x2f8(%r13) /* Save prefix register */ mvc __SF_EMPTY(4,%r15),0x318(%r13) /* Restore absolute zero pages */ lghi %r2,0 larl %r4,suspend_zero_pages lg %r4,0(%r4) lghi %r3,2*PAGE_SIZE lghi %r5,2*PAGE_SIZE 1: mvcle %r2,%r4,0 jo 1b /* Restore prefix register */ spx __SF_EMPTY(%r15) /* Activate DAT */ stosm __SF_EMPTY(%r15),0x04 /* Make all free pages unstable */ lghi %r2,0 brasl %r14,arch_set_page_states /* Call arch specific early resume code */ brasl %r14,s390_early_resume /* Return 0 */ lmg %r6,%r15,STACK_FRAME_OVERHEAD + __SF_GPRS(%r15) lghi %r2,0 BR_EX %r14 ENDPROC(swsusp_arch_resume) .section .data..nosave,"aw",@progbits .align 8 .Ldisabled_wait_31: .long 0x000a0000,0x00000000 .Lpanic_string: .asciz "Resume not possible because suspend CPU is no longer available\n" .align 8 .Lrestart_suspend_psw: .quad 0x0000000180000000,restart_suspend .Lnew_pgm_check_psw: .quad 0,pgm_check_entry .Lresume_cpu: .byte 0,0 |