1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * SCLP early driver 4 * 5 * Copyright IBM Corp. 2013 6 */ 7 8 #define KMSG_COMPONENT "sclp_early" 9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 10 11 #include <linux/errno.h> 12 #include <asm/ctl_reg.h> 13 #include <asm/sclp.h> 14 #include <asm/ipl.h> 15 #include "sclp_sdias.h" 16 #include "sclp.h" 17 18 static struct sclp_ipl_info sclp_ipl_info; 19 20 struct sclp_info sclp; 21 EXPORT_SYMBOL(sclp); 22 23 static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb) 24 { 25 struct sclp_core_entry *cpue; 26 u16 boot_cpu_address, cpu; 27 28 if (sclp_early_get_info(sccb)) 29 return; 30 31 sclp.facilities = sccb->facilities; 32 sclp.has_sprp = !!(sccb->fac84 & 0x02); 33 sclp.has_core_type = !!(sccb->fac84 & 0x01); 34 sclp.has_gsls = !!(sccb->fac85 & 0x80); 35 sclp.has_64bscao = !!(sccb->fac116 & 0x80); 36 sclp.has_cmma = !!(sccb->fac116 & 0x40); 37 sclp.has_esca = !!(sccb->fac116 & 0x08); 38 sclp.has_pfmfi = !!(sccb->fac117 & 0x40); 39 sclp.has_ibs = !!(sccb->fac117 & 0x20); 40 sclp.has_gisaf = !!(sccb->fac118 & 0x08); 41 sclp.has_hvs = !!(sccb->fac119 & 0x80); 42 sclp.has_kss = !!(sccb->fac98 & 0x01); 43 sclp.has_sipl = !!(sccb->cbl & 0x02); 44 if (sccb->fac85 & 0x02) 45 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; 46 if (sccb->fac91 & 0x40) 47 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST; 48 if (sccb->cpuoff > 134) 49 sclp.has_diag318 = !!(sccb->byte_134 & 0x80); 50 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 51 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 52 sclp.rzm <<= 20; 53 sclp.ibc = sccb->ibc; 54 55 if (sccb->hamaxpow && sccb->hamaxpow < 64) 56 sclp.hamax = (1UL << sccb->hamaxpow) - 1; 57 else 58 sclp.hamax = U64_MAX; 59 60 if (!sccb->hcpua) { 61 if (MACHINE_IS_VM) 62 sclp.max_cores = 64; 63 else 64 sclp.max_cores = sccb->ncpurl; 65 } else { 66 sclp.max_cores = sccb->hcpua + 1; 67 } 68 69 boot_cpu_address = stap(); 70 cpue = (void *)sccb + sccb->cpuoff; 71 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { 72 if (boot_cpu_address != cpue->core_id) 73 continue; 74 sclp.has_siif = cpue->siif; 75 sclp.has_sigpif = cpue->sigpif; 76 sclp.has_sief2 = cpue->sief2; 77 sclp.has_gpere = cpue->gpere; 78 sclp.has_ib = cpue->ib; 79 sclp.has_cei = cpue->cei; 80 sclp.has_skey = cpue->skey; 81 break; 82 } 83 84 /* Save IPL information */ 85 sclp_ipl_info.is_valid = 1; 86 if (sccb->fac91 & 0x2) 87 sclp_ipl_info.has_dump = 1; 88 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); 89 90 if (sccb->hsa_size) 91 sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE; 92 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; 93 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; 94 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; 95 96 sclp.hmfai = sccb->hmfai; 97 sclp.has_dirq = !!(sccb->cpudirq & 0x80); 98 } 99 100 /* 101 * This function will be called after sclp_early_facilities_detect(), which gets 102 * called from early.c code. The sclp_early_facilities_detect() function retrieves 103 * and saves the IPL information. 104 */ 105 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) 106 { 107 *info = sclp_ipl_info; 108 } 109 110 static struct sclp_core_info sclp_early_core_info __initdata; 111 static int sclp_early_core_info_valid __initdata; 112 113 static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb) 114 { 115 if (!SCLP_HAS_CPU_INFO) 116 return; 117 memset(sccb, 0, sizeof(*sccb)); 118 sccb->header.length = sizeof(*sccb); 119 if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) 120 return; 121 if (sccb->header.response_code != 0x0010) 122 return; 123 sclp_fill_core_info(&sclp_early_core_info, sccb); 124 sclp_early_core_info_valid = 1; 125 } 126 127 int __init sclp_early_get_core_info(struct sclp_core_info *info) 128 { 129 if (!sclp_early_core_info_valid) 130 return -EIO; 131 *info = sclp_early_core_info; 132 return 0; 133 } 134 135 static void __init sclp_early_console_detect(struct init_sccb *sccb) 136 { 137 if (sccb->header.response_code != 0x20) 138 return; 139 140 if (sclp_early_con_check_vt220(sccb)) 141 sclp.has_vt220 = 1; 142 143 if (sclp_early_con_check_linemode(sccb)) 144 sclp.has_linemode = 1; 145 } 146 147 void __init sclp_early_detect(void) 148 { 149 void *sccb = sclp_early_sccb; 150 151 sclp_early_facilities_detect(sccb); 152 sclp_early_init_core_info(sccb); 153 154 /* 155 * Turn off SCLP event notifications. Also save remote masks in the 156 * sccb. These are sufficient to detect sclp console capabilities. 157 */ 158 sclp_early_set_event_mask(sccb, 0, 0); 159 sclp_early_console_detect(sccb); 160 } 161