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 sclp.has_sipl_g2 = !!(sccb->cbl & 0x04); 45 if (sccb->fac85 & 0x02) 46 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; 47 if (sccb->fac91 & 0x40) 48 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST; 49 if (sccb->cpuoff > 134) 50 sclp.has_diag318 = !!(sccb->byte_134 & 0x80); 51 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 52 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 53 sclp.rzm <<= 20; 54 sclp.ibc = sccb->ibc; 55 56 if (sccb->hamaxpow && sccb->hamaxpow < 64) 57 sclp.hamax = (1UL << sccb->hamaxpow) - 1; 58 else 59 sclp.hamax = U64_MAX; 60 61 if (!sccb->hcpua) { 62 if (MACHINE_IS_VM) 63 sclp.max_cores = 64; 64 else 65 sclp.max_cores = sccb->ncpurl; 66 } else { 67 sclp.max_cores = sccb->hcpua + 1; 68 } 69 70 boot_cpu_address = stap(); 71 cpue = (void *)sccb + sccb->cpuoff; 72 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { 73 if (boot_cpu_address != cpue->core_id) 74 continue; 75 sclp.has_siif = cpue->siif; 76 sclp.has_sigpif = cpue->sigpif; 77 sclp.has_sief2 = cpue->sief2; 78 sclp.has_gpere = cpue->gpere; 79 sclp.has_ib = cpue->ib; 80 sclp.has_cei = cpue->cei; 81 sclp.has_skey = cpue->skey; 82 break; 83 } 84 85 /* Save IPL information */ 86 sclp_ipl_info.is_valid = 1; 87 if (sccb->fac91 & 0x2) 88 sclp_ipl_info.has_dump = 1; 89 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); 90 91 if (sccb->hsa_size) 92 sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE; 93 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; 94 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; 95 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; 96 97 sclp.hmfai = sccb->hmfai; 98 sclp.has_dirq = !!(sccb->cpudirq & 0x80); 99 } 100 101 /* 102 * This function will be called after sclp_early_facilities_detect(), which gets 103 * called from early.c code. The sclp_early_facilities_detect() function retrieves 104 * and saves the IPL information. 105 */ 106 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) 107 { 108 *info = sclp_ipl_info; 109 } 110 111 static struct sclp_core_info sclp_early_core_info __initdata; 112 static int sclp_early_core_info_valid __initdata; 113 114 static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb) 115 { 116 if (!SCLP_HAS_CPU_INFO) 117 return; 118 memset(sccb, 0, sizeof(*sccb)); 119 sccb->header.length = sizeof(*sccb); 120 if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) 121 return; 122 if (sccb->header.response_code != 0x0010) 123 return; 124 sclp_fill_core_info(&sclp_early_core_info, sccb); 125 sclp_early_core_info_valid = 1; 126 } 127 128 int __init sclp_early_get_core_info(struct sclp_core_info *info) 129 { 130 if (!sclp_early_core_info_valid) 131 return -EIO; 132 *info = sclp_early_core_info; 133 return 0; 134 } 135 136 static void __init sclp_early_console_detect(struct init_sccb *sccb) 137 { 138 if (sccb->header.response_code != 0x20) 139 return; 140 141 if (sclp_early_con_check_vt220(sccb)) 142 sclp.has_vt220 = 1; 143 144 if (sclp_early_con_check_linemode(sccb)) 145 sclp.has_linemode = 1; 146 } 147 148 void __init sclp_early_detect(void) 149 { 150 void *sccb = sclp_early_sccb; 151 152 sclp_early_facilities_detect(sccb); 153 sclp_early_init_core_info(sccb); 154 155 /* 156 * Turn off SCLP event notifications. Also save remote masks in the 157 * sccb. These are sufficient to detect sclp console capabilities. 158 */ 159 sclp_early_set_event_mask(sccb, 0, 0); 160 sclp_early_console_detect(sccb); 161 } 162