1 /* 2 * s390x interrupt handling 3 * 4 * Copyright (c) 2017 Red Hat Inc 5 * 6 * Authors: 7 * David Hildenbrand <david@redhat.com> 8 * 9 * This code is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU Library General Public License version 2. 11 */ 12 #include <libcflat.h> 13 #include <asm/interrupt.h> 14 #include <asm/barrier.h> 15 16 static bool pgm_int_expected; 17 static struct lowcore *lc; 18 19 void expect_pgm_int(void) 20 { 21 pgm_int_expected = true; 22 lc->pgm_int_code = 0; 23 mb(); 24 } 25 26 uint16_t clear_pgm_int(void) 27 { 28 uint16_t code; 29 30 mb(); 31 code = lc->pgm_int_code; 32 lc->pgm_int_code = 0; 33 pgm_int_expected = false; 34 return code; 35 } 36 37 void check_pgm_int_code(uint16_t code) 38 { 39 mb(); 40 report("Program interrupt: expected(%d) == received(%d)", 41 code == lc->pgm_int_code, code, lc->pgm_int_code); 42 } 43 44 static void fixup_pgm_int(void) 45 { 46 switch (lc->pgm_int_code) { 47 case PGM_INT_CODE_PRIVILEGED_OPERATION: 48 /* Normal operation is in supervisor state, so this exception 49 * was produced intentionally and we should return to the 50 * supervisor state. 51 */ 52 lc->pgm_old_psw.mask &= ~PSW_MASK_PSTATE; 53 break; 54 case PGM_INT_CODE_SEGMENT_TRANSLATION: 55 case PGM_INT_CODE_PAGE_TRANSLATION: 56 case PGM_INT_CODE_TRACE_TABLE: 57 case PGM_INT_CODE_AFX_TRANSLATION: 58 case PGM_INT_CODE_ASX_TRANSLATION: 59 case PGM_INT_CODE_LX_TRANSLATION: 60 case PGM_INT_CODE_EX_TRANSLATION: 61 case PGM_INT_CODE_PRIMARY_AUTHORITY: 62 case PGM_INT_CODE_SECONDARY_AUTHORITY: 63 case PGM_INT_CODE_LFX_TRANSLATION: 64 case PGM_INT_CODE_LSX_TRANSLATION: 65 case PGM_INT_CODE_ALEN_TRANSLATION: 66 case PGM_INT_CODE_ALE_SEQUENCE: 67 case PGM_INT_CODE_ASTE_VALIDITY: 68 case PGM_INT_CODE_ASTE_SEQUENCE: 69 case PGM_INT_CODE_EXTENDED_AUTHORITY: 70 case PGM_INT_CODE_LSTE_SEQUENCE: 71 case PGM_INT_CODE_ASTE_INSTANCE: 72 case PGM_INT_CODE_STACK_FULL: 73 case PGM_INT_CODE_STACK_EMPTY: 74 case PGM_INT_CODE_STACK_SPECIFICATION: 75 case PGM_INT_CODE_STACK_TYPE: 76 case PGM_INT_CODE_STACK_OPERATION: 77 case PGM_INT_CODE_ASCE_TYPE: 78 case PGM_INT_CODE_REGION_FIRST_TRANS: 79 case PGM_INT_CODE_REGION_SECOND_TRANS: 80 case PGM_INT_CODE_REGION_THIRD_TRANS: 81 case PGM_INT_CODE_PER: 82 case PGM_INT_CODE_CRYPTO_OPERATION: 83 /* The interrupt was nullified, the old PSW points at the 84 * responsible instruction. Forward the PSW so we don't loop. 85 */ 86 lc->pgm_old_psw.addr += lc->pgm_int_id; 87 } 88 /* suppressed/terminated/completed point already at the next address */ 89 } 90 91 void handle_pgm_int(void) 92 { 93 if (!pgm_int_expected) 94 report_abort("Unexpected program interrupt: %d at %#lx, ilen %d\n", 95 lc->pgm_int_code, lc->pgm_old_psw.addr, 96 lc->pgm_int_id); 97 98 pgm_int_expected = false; 99 fixup_pgm_int(); 100 } 101