| 1 | /* |
| 2 | * SCLP ASCII access driver |
| 3 | * |
| 4 | * Copyright (c) 2013 Alexander Graf <agraf@suse.de> |
| 5 | * |
| 6 | * This work is licensed under the terms of the GNU GPL, version 2 or (at |
| 7 | * your option) any later version. See the COPYING file in the top-level |
| 8 | * directory. |
| 9 | */ |
| 10 | |
| 11 | #include <string.h> |
| 12 | #include "s390-ccw.h" |
| 13 | #include "sclp.h" |
| 14 | |
| 15 | long write(int fd, const void *str, size_t len); |
| 16 | |
| 17 | static char _sccb[PAGE_SIZE] __attribute__((__aligned__(4096))); |
| 18 | |
| 19 | const unsigned char ebc2asc[256] = |
| 20 | /* 0123456789abcdef0123456789abcdef */ |
| 21 | "................................" /* 1F */ |
| 22 | "................................" /* 3F */ |
| 23 | " ...........<(+|&.........!$*);." /* 5F first.chr.here.is.real.space */ |
| 24 | "-/.........,%_>?.........`:#@'=\""/* 7F */ |
| 25 | ".abcdefghi.......jklmnopqr......" /* 9F */ |
| 26 | "..stuvwxyz......................" /* BF */ |
| 27 | ".ABCDEFGHI.......JKLMNOPQR......" /* DF */ |
| 28 | "..STUVWXYZ......0123456789......";/* FF */ |
| 29 | |
| 30 | /* Perform service call. Return 0 on success, non-zero otherwise. */ |
| 31 | static int sclp_service_call(unsigned int command, void *sccb) |
| 32 | { |
| 33 | int cc; |
| 34 | |
| 35 | asm volatile( |
| 36 | " .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */ |
| 37 | " ipm %0\n" |
| 38 | " srl %0,28" |
| 39 | : "=&d" (cc) : "d" (command), "a" (__pa(sccb)) |
| 40 | : "cc", "memory"); |
| 41 | consume_sclp_int(); |
| 42 | if (cc == 3) |
| 43 | return -EIO; |
| 44 | if (cc == 2) |
| 45 | return -EBUSY; |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | void sclp_set_write_mask(uint32_t receive_mask, uint32_t send_mask) |
| 50 | { |
| 51 | WriteEventMask *sccb = (void *)_sccb; |
| 52 | |
| 53 | sccb->h.length = sizeof(WriteEventMask); |
| 54 | sccb->mask_length = sizeof(unsigned int); |
| 55 | sccb->cp_receive_mask = receive_mask; |
| 56 | sccb->cp_send_mask = send_mask; |
| 57 | |
| 58 | sclp_service_call(SCLP_CMD_WRITE_EVENT_MASK, sccb); |
| 59 | } |
| 60 | |
| 61 | void sclp_setup(void) |
| 62 | { |
| 63 | sclp_set_write_mask(0, SCLP_EVENT_MASK_MSG_ASCII); |
| 64 | } |
| 65 | |
| 66 | long write(int fd, const void *str, size_t len) |
| 67 | { |
| 68 | WriteEventData *sccb = (void *)_sccb; |
| 69 | const char *p = str; |
| 70 | size_t data_len = 0; |
| 71 | size_t i; |
| 72 | |
| 73 | if (fd != 1 && fd != 2) { |
| 74 | return -EIO; |
| 75 | } |
| 76 | |
| 77 | for (i = 0; i < len; i++) { |
| 78 | if ((data_len + 1) >= SCCB_DATA_LEN) { |
| 79 | /* We would overflow the sccb buffer, abort early */ |
| 80 | len = i; |
| 81 | break; |
| 82 | } |
| 83 | |
| 84 | if (*p == '\n') { |
| 85 | /* Terminal emulators might need \r\n, so generate it */ |
| 86 | sccb->data[data_len++] = '\r'; |
| 87 | } |
| 88 | |
| 89 | sccb->data[data_len++] = *p; |
| 90 | p++; |
| 91 | } |
| 92 | |
| 93 | sccb->h.length = sizeof(WriteEventData) + data_len; |
| 94 | sccb->h.function_code = SCLP_FC_NORMAL_WRITE; |
| 95 | sccb->ebh.length = sizeof(EventBufferHeader) + data_len; |
| 96 | sccb->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA; |
| 97 | sccb->ebh.flags = 0; |
| 98 | |
| 99 | sclp_service_call(SCLP_CMD_WRITE_EVENT_DATA, sccb); |
| 100 | |
| 101 | return len; |
| 102 | } |
| 103 | |
| 104 | void sclp_get_loadparm_ascii(char *loadparm) |
| 105 | { |
| 106 | |
| 107 | ReadInfo *sccb = (void *)_sccb; |
| 108 | |
| 109 | memset((char *)_sccb, 0, sizeof(ReadInfo)); |
| 110 | sccb->h.length = SCCB_SIZE; |
| 111 | if (!sclp_service_call(SCLP_CMDW_READ_SCP_INFO, sccb)) { |
| 112 | ebcdic_to_ascii((char *) sccb->loadparm, loadparm, LOADPARM_LEN); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | bool sclp_is_diag320_on(void) |
| 117 | { |
| 118 | ReadInfo *sccb = (void *)_sccb; |
| 119 | |
| 120 | memset((char *)_sccb, 0, sizeof(ReadInfo)); |
| 121 | sccb->h.length = SCCB_SIZE; |
| 122 | if (!sclp_service_call(SCLP_CMDW_READ_SCP_INFO, sccb)) { |
| 123 | return sccb->fac134 & SCCB_FAC134_DIAG320_BIT; |
| 124 | } |
| 125 | |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | /* check if specified IPL facility flag is enabled */ |
| 130 | bool sclp_is_fac_ipl_flag_on(uint16_t fac_ipl_flag) |
| 131 | { |
| 132 | ReadInfo *sccb = (void *)_sccb; |
| 133 | |
| 134 | memset((char *)_sccb, 0, sizeof(ReadInfo)); |
| 135 | sccb->h.length = SCCB_SIZE; |
| 136 | if (!sclp_service_call(SCLP_CMDW_READ_SCP_INFO, sccb)) { |
| 137 | return sccb->fac_ipl & fac_ipl_flag; |
| 138 | } |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | int sclp_read(char *str, size_t count) |
| 144 | { |
| 145 | ReadEventData *sccb = (void *)_sccb; |
| 146 | char *buf = (char *)(&sccb->ebh) + 7; |
| 147 | |
| 148 | /* If count exceeds max buffer size, then restrict it to the max size */ |
| 149 | if (count > SCCB_SIZE - 8) { |
| 150 | count = SCCB_SIZE - 8; |
| 151 | } |
| 152 | |
| 153 | sccb->h.length = SCCB_SIZE; |
| 154 | sccb->h.function_code = SCLP_UNCONDITIONAL_READ; |
| 155 | |
| 156 | sclp_service_call(SCLP_CMD_READ_EVENT_DATA, sccb); |
| 157 | memcpy(str, buf, count); |
| 158 | |
| 159 | return sccb->ebh.length - 7; |
| 160 | } |