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 if (sccb->fac85 & 0x02) 44 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; 45 if (sccb->fac91 & 0x40) 46 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST; 47 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 48 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 49 sclp.rzm <<= 20; 50 sclp.ibc = sccb->ibc; 51 52 if (sccb->hamaxpow && sccb->hamaxpow < 64) 53 sclp.hamax = (1UL << sccb->hamaxpow) - 1; 54 else 55 sclp.hamax = U64_MAX; 56 57 if (!sccb->hcpua) { 58 if (MACHINE_IS_VM) 59 sclp.max_cores = 64; 60 else 61 sclp.max_cores = sccb->ncpurl; 62 } else { 63 sclp.max_cores = sccb->hcpua + 1; 64 } 65 66 boot_cpu_address = stap(); 67 cpue = (void *)sccb + sccb->cpuoff; 68 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { 69 if (boot_cpu_address != cpue->core_id) 70 continue; 71 sclp.has_siif = cpue->siif; 72 sclp.has_sigpif = cpue->sigpif; 73 sclp.has_sief2 = cpue->sief2; 74 sclp.has_gpere = cpue->gpere; 75 sclp.has_ib = cpue->ib; 76 sclp.has_cei = cpue->cei; 77 sclp.has_skey = cpue->skey; 78 break; 79 } 80 81 /* Save IPL information */ 82 sclp_ipl_info.is_valid = 1; 83 if (sccb->fac91 & 0x2) 84 sclp_ipl_info.has_dump = 1; 85 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); 86 87 if (sccb->hsa_size) 88 sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE; 89 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; 90 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; 91 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; 92 93 sclp.hmfai = sccb->hmfai; 94 } 95 96 /* 97 * This function will be called after sclp_early_facilities_detect(), which gets 98 * called from early.c code. The sclp_early_facilities_detect() function retrieves 99 * and saves the IPL information. 100 */ 101 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) 102 { 103 *info = sclp_ipl_info; 104 } 105 106 static struct sclp_core_info sclp_early_core_info __initdata; 107 static int sclp_early_core_info_valid __initdata; 108 109 static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb) 110 { 111 if (!SCLP_HAS_CPU_INFO) 112 return; 113 memset(sccb, 0, sizeof(*sccb)); 114 sccb->header.length = sizeof(*sccb); 115 if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) 116 return; 117 if (sccb->header.response_code != 0x0010) 118 return; 119 sclp_fill_core_info(&sclp_early_core_info, sccb); 120 sclp_early_core_info_valid = 1; 121 } 122 123 int __init sclp_early_get_core_info(struct sclp_core_info *info) 124 { 125 if (!sclp_early_core_info_valid) 126 return -EIO; 127 *info = sclp_early_core_info; 128 return 0; 129 } 130 131 static void __init sclp_early_console_detect(struct init_sccb *sccb) 132 { 133 if (sccb->header.response_code != 0x20) 134 return; 135 136 if (sclp_early_con_check_vt220(sccb)) 137 sclp.has_vt220 = 1; 138 139 if (sclp_early_con_check_linemode(sccb)) 140 sclp.has_linemode = 1; 141 } 142 143 void __init sclp_early_detect(void) 144 { 145 void *sccb = &sclp_early_sccb; 146 147 sclp_early_facilities_detect(sccb); 148 sclp_early_init_core_info(sccb); 149 150 /* 151 * Turn off SCLP event notifications. Also save remote masks in the 152 * sccb. These are sufficient to detect sclp console capabilities. 153 */ 154 sclp_early_set_event_mask(sccb, 0, 0); 155 sclp_early_console_detect(sccb); 156 } 157