1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * POWER Dynamic Execution Control Facility (DEXCR) 4 * 5 * This header file contains helper functions and macros 6 * required for all the DEXCR related test cases. 7 */ 8 #ifndef _SELFTESTS_POWERPC_DEXCR_DEXCR_H 9 #define _SELFTESTS_POWERPC_DEXCR_DEXCR_H 10 11 #include <stdbool.h> 12 #include <sys/prctl.h> 13 #include <sys/types.h> 14 15 #include "reg.h" 16 17 #define DEXCR_PR_BIT(aspect) __MASK(63 - (32 + (aspect))) 18 #define DEXCR_PR_SBHE DEXCR_PR_BIT(0) 19 #define DEXCR_PR_IBRTPD DEXCR_PR_BIT(3) 20 #define DEXCR_PR_SRAPD DEXCR_PR_BIT(4) 21 #define DEXCR_PR_NPHIE DEXCR_PR_BIT(5) 22 23 #define PPC_RAW_HASH_ARGS(b, i, a) \ 24 ((((i) >> 3) & 0x1F) << 21 | (a) << 16 | (b) << 11 | (((i) >> 8) & 0x1)) 25 #define PPC_RAW_HASHST(b, i, a) \ 26 str(.long (0x7C0005A4 | PPC_RAW_HASH_ARGS(b, i, a));) 27 #define PPC_RAW_HASHCHK(b, i, a) \ 28 str(.long (0x7C0005E4 | PPC_RAW_HASH_ARGS(b, i, a));) 29 30 struct dexcr_aspect { 31 const char *name; /* Short display name */ 32 const char *opt; /* Option name for chdexcr */ 33 const char *desc; /* Expanded aspect meaning */ 34 unsigned int index; /* Aspect bit index in DEXCR */ 35 unsigned long prctl; /* 'which' value for get/set prctl */ 36 }; 37 38 static const struct dexcr_aspect aspects[] = { 39 { 40 .name = "SBHE", 41 .opt = "sbhe", 42 .desc = "Speculative branch hint enable", 43 .index = 0, 44 .prctl = PR_PPC_DEXCR_SBHE, 45 }, 46 { 47 .name = "IBRTPD", 48 .opt = "ibrtpd", 49 .desc = "Indirect branch recurrent target prediction disable", 50 .index = 3, 51 .prctl = PR_PPC_DEXCR_IBRTPD, 52 }, 53 { 54 .name = "SRAPD", 55 .opt = "srapd", 56 .desc = "Subroutine return address prediction disable", 57 .index = 4, 58 .prctl = PR_PPC_DEXCR_SRAPD, 59 }, 60 { 61 .name = "NPHIE", 62 .opt = "nphie", 63 .desc = "Non-privileged hash instruction enable", 64 .index = 5, 65 .prctl = PR_PPC_DEXCR_NPHIE, 66 }, 67 { 68 .name = "PHIE", 69 .opt = "phie", 70 .desc = "Privileged hash instruction enable", 71 .index = 6, 72 .prctl = -1, 73 }, 74 }; 75 76 bool dexcr_exists(void); 77 78 bool pr_dexcr_aspect_supported(unsigned long which); 79 80 bool pr_dexcr_aspect_editable(unsigned long which); 81 82 int pr_get_dexcr(unsigned long pr_aspect); 83 84 int pr_set_dexcr(unsigned long pr_aspect, unsigned long ctrl); 85 86 unsigned int pr_which_to_aspect(unsigned long which); 87 88 bool hashchk_triggers(void); 89 90 enum dexcr_source { 91 DEXCR, /* Userspace DEXCR value */ 92 HDEXCR, /* Hypervisor enforced DEXCR value */ 93 EFFECTIVE, /* Bitwise OR of UDEXCR and ENFORCED DEXCR bits */ 94 }; 95 96 unsigned int get_dexcr(enum dexcr_source source); 97 98 void await_child_success(pid_t pid); 99 100 void hashst(unsigned long lr, void *sp); 101 102 void hashchk(unsigned long lr, void *sp); 103 104 void do_bad_hashchk(void); 105 106 #endif /* _SELFTESTS_POWERPC_DEXCR_DEXCR_H */ 107