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170 lines
4.3 KiB
170 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* SCLP early driver |
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* |
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* Copyright IBM Corp. 2013 |
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*/ |
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#define KMSG_COMPONENT "sclp_early" |
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
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#include <linux/errno.h> |
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#include <linux/memblock.h> |
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#include <asm/ctl_reg.h> |
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#include <asm/sclp.h> |
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#include <asm/ipl.h> |
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#include <asm/setup.h> |
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#include <asm/facility.h> |
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#include "sclp_sdias.h" |
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#include "sclp.h" |
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static struct sclp_ipl_info sclp_ipl_info; |
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struct sclp_info sclp; |
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EXPORT_SYMBOL(sclp); |
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static void __init sclp_early_facilities_detect(void) |
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{ |
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struct sclp_core_entry *cpue; |
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struct read_info_sccb *sccb; |
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u16 boot_cpu_address, cpu; |
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sccb = sclp_early_get_info(); |
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if (!sccb) |
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return; |
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sclp.facilities = sccb->facilities; |
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sclp.has_sprp = !!(sccb->fac84 & 0x02); |
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sclp.has_core_type = !!(sccb->fac84 & 0x01); |
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sclp.has_gsls = !!(sccb->fac85 & 0x80); |
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sclp.has_64bscao = !!(sccb->fac116 & 0x80); |
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sclp.has_cmma = !!(sccb->fac116 & 0x40); |
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sclp.has_esca = !!(sccb->fac116 & 0x08); |
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sclp.has_pfmfi = !!(sccb->fac117 & 0x40); |
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sclp.has_ibs = !!(sccb->fac117 & 0x20); |
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sclp.has_gisaf = !!(sccb->fac118 & 0x08); |
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sclp.has_hvs = !!(sccb->fac119 & 0x80); |
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sclp.has_kss = !!(sccb->fac98 & 0x01); |
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if (sccb->fac85 & 0x02) |
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S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; |
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if (sccb->fac91 & 0x40) |
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S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST; |
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if (sccb->cpuoff > 134) |
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sclp.has_diag318 = !!(sccb->byte_134 & 0x80); |
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if (sccb->cpuoff > 137) |
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sclp.has_sipl = !!(sccb->cbl & 0x4000); |
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sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; |
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sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; |
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sclp.rzm <<= 20; |
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sclp.ibc = sccb->ibc; |
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if (sccb->hamaxpow && sccb->hamaxpow < 64) |
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sclp.hamax = (1UL << sccb->hamaxpow) - 1; |
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else |
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sclp.hamax = U64_MAX; |
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if (!sccb->hcpua) { |
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if (MACHINE_IS_VM) |
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sclp.max_cores = 64; |
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else |
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sclp.max_cores = sccb->ncpurl; |
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} else { |
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sclp.max_cores = sccb->hcpua + 1; |
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} |
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boot_cpu_address = stap(); |
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cpue = (void *)sccb + sccb->cpuoff; |
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for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { |
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if (boot_cpu_address != cpue->core_id) |
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continue; |
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sclp.has_siif = cpue->siif; |
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sclp.has_sigpif = cpue->sigpif; |
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sclp.has_sief2 = cpue->sief2; |
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sclp.has_gpere = cpue->gpere; |
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sclp.has_ib = cpue->ib; |
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sclp.has_cei = cpue->cei; |
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sclp.has_skey = cpue->skey; |
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break; |
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} |
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/* Save IPL information */ |
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sclp_ipl_info.is_valid = 1; |
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if (sccb->fac91 & 0x2) |
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sclp_ipl_info.has_dump = 1; |
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memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); |
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if (sccb->hsa_size) |
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sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE; |
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sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; |
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sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; |
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sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; |
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sclp.hmfai = sccb->hmfai; |
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sclp.has_dirq = !!(sccb->cpudirq & 0x80); |
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} |
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/* |
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* This function will be called after sclp_early_facilities_detect(), which gets |
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* called from early.c code. The sclp_early_facilities_detect() function retrieves |
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* and saves the IPL information. |
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*/ |
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void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) |
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{ |
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*info = sclp_ipl_info; |
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} |
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int __init sclp_early_get_core_info(struct sclp_core_info *info) |
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{ |
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struct read_cpu_info_sccb *sccb; |
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int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE; |
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int rc = 0; |
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if (!SCLP_HAS_CPU_INFO) |
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return -EOPNOTSUPP; |
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sccb = memblock_alloc_low(length, PAGE_SIZE); |
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if (!sccb) |
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return -ENOMEM; |
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memset(sccb, 0, length); |
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sccb->header.length = length; |
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sccb->header.control_mask[2] = 0x80; |
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if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) { |
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rc = -EIO; |
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goto out; |
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} |
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if (sccb->header.response_code != 0x0010) { |
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rc = -EIO; |
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goto out; |
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} |
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sclp_fill_core_info(info, sccb); |
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out: |
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memblock_free_early((unsigned long)sccb, length); |
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return rc; |
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} |
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static void __init sclp_early_console_detect(struct init_sccb *sccb) |
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{ |
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if (sccb->header.response_code != 0x20) |
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return; |
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if (sclp_early_con_check_vt220(sccb)) |
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sclp.has_vt220 = 1; |
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if (sclp_early_con_check_linemode(sccb)) |
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sclp.has_linemode = 1; |
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} |
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void __init sclp_early_detect(void) |
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{ |
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void *sccb = sclp_early_sccb; |
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sclp_early_facilities_detect(); |
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/* |
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* Turn off SCLP event notifications. Also save remote masks in the |
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* sccb. These are sufficient to detect sclp console capabilities. |
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*/ |
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sclp_early_set_event_mask(sccb, 0, 0); |
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sclp_early_console_detect(sccb); |
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}
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