[kvm-unit-tests PATCH 2/6] s390x: Add linemode console

Janosch Frank
2019-08-29T12:15:25Z

z/VM isn't fond of vt220, so we need line mode when running under
z/VM.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
---
lib/s390x/sclp-console.c | 181 +++++++++++++++++++++++++++++++++++----
lib/s390x/sclp.h | 55 +++++++++++-
2 files changed, 218 insertions(+), 18 deletions(-)

diff --git a/lib/s390x/sclp-console.c b/lib/s390x/sclp-console.c
index a5ef45f..19416b5 100644
--- a/lib/s390x/sclp-console.c
+++ b/lib/s390x/sclp-console.c
@@ -11,21 +11,165 @@
#include <libcflat.h>
#include <string.h>
#include <asm/page.h>
+#include <asm/arch_def.h>
+#include <asm/io.h>
#include "sclp.h"

+/*
+ * ASCII (IBM PC 437) -> EBCDIC 037
+ */
+static uint8_t _ascebc[256] = {
+ /*00 NUL SOH STX ETX EOT ENQ ACK BEL */
+ 0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F,
+ /*08 BS HT LF VT FF CR SO SI */
+ /* ->NL */
+ 0x16, 0x05, 0x15, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
+ /*10 DLE DC1 DC2 DC3 DC4 NAK SYN ETB */
+ 0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26,
+ /*18 CAN EM SUB ESC FS GS RS US */
+ /* ->IGS ->IRS ->IUS */
+ 0x18, 0x19, 0x3F, 0x27, 0x22, 0x1D, 0x1E, 0x1F,
+ /*20 SP ! " # $ % & ' */
+ 0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D,
+ /*28 ( ) * + , - . / */
+ 0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
+ /*30 0 1 2 3 4 5 6 7 */
+ 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
+ /*38 8 9 : ; < = > ? */
+ 0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
+ /*40 @ A B C D E F G */
+ 0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
+ /*48 H I J K L M N O */
+ 0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
+ /*50 P Q R S T U V W */
+ 0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6,
+ /*58 X Y Z [ \ ] ^ _ */
+ 0xE7, 0xE8, 0xE9, 0xBA, 0xE0, 0xBB, 0xB0, 0x6D,
+ /*60 ` a b c d e f g */
+ 0x79, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+ /*68 h i j k l m n o */
+ 0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
+ /*70 p q r s t u v w */
+ 0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6,
+ /*78 x y z { | } ~ DL */
+ 0xA7, 0xA8, 0xA9, 0xC0, 0x4F, 0xD0, 0xA1, 0x07,
+ /*80*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*88*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*90*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*98*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*A0*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*A8*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*B0*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*B8*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*C0*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*C8*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*D0*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*D8*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*E0 sz */
+ 0x3F, 0x59, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*E8*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*F0*/
+ 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F, 0x3F,
+ /*F8*/
+ 0x90, 0x3F, 0x3F, 0x3F, 0x3F, 0xEA, 0x3F, 0xFF
+};
+
+static void sclp_print_ascii(const char *str)
+{
+ int len = strlen(str);
+ WriteEventData *sccb = (void *)_sccb;
+
+ sclp_mark_busy();
+ memset(sccb, 0, sizeof(*sccb));
+ sccb->h.length = offsetof(WriteEventData, msg) + len;
+ sccb->h.function_code = SCLP_FC_NORMAL_WRITE;
+ sccb->ebh.length = sizeof(EventBufferHeader) + len;
+ sccb->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA;
+ memcpy(&sccb->msg, str, len);
+
+ sclp_service_call(SCLP_CMD_WRITE_EVENT_DATA, sccb);
+}
+
+static void sclp_print_lm(const char *str)
+{
+ unsigned char *ptr, *end, ch;
+ unsigned int count, offset, len;
+ struct WriteEventData *sccb;
+ struct mdb *mdb;
+ struct mto *mto;
+ struct go *go;
+
+ sclp_mark_busy();
+ sccb = (struct WriteEventData *) _sccb;
+ end = (unsigned char *) sccb + 4096 - 1;
+ memset(sccb, 0, sizeof(*sccb));
+ ptr = (unsigned char *) &sccb->msg.mdb.mto;
+ len = strlen(str);
+ offset = 0;
+ do {
+ for (count = sizeof(*mto); offset < len; count++) {
+ ch = str[offset++];
+ if (ch == 0x0a || ptr + count > end)
+ break;
+ ptr[count] = _ascebc[ch];
+ }
+ mto = (struct mto *) ptr;
+ mto->length = count;
+ mto->type = 4;
+ mto->line_type_flags = LNTPFLGS_ENDTEXT;
+ ptr += count;
+ } while (offset < len && ptr + sizeof(*mto) <= end);
+ len = ptr - (unsigned char *) sccb;
+ sccb->h.length = len - offsetof(struct WriteEventData, h);
+ sccb->h.function_code = SCLP_FC_NORMAL_WRITE;
+ sccb->ebh.type = EVTYP_MSG;
+ sccb->ebh.length = len - offsetof(struct WriteEventData, ebh);
+ mdb = &sccb->msg.mdb;
+ mdb->header.type = 1;
+ mdb->header.tag = 0xD4C4C240;
+ mdb->header.revision_code = 1;
+ mdb->header.length = len - offsetof(struct WriteEventData, msg.mdb.header);
+ go = &mdb->go;
+ go->length = sizeof(*go);
+ go->type = 1;
+ sclp_service_call(SCLP_CMD_WRITE_EVENT_DATA, sccb);
+}
+
+/*
+ * SCLP needs to be initialized by setting a send and receive mask,
+ * indicating which messages the control program (we) want(s) to
+ * send/receive.
+ */
static void sclp_set_write_mask(void)
{
WriteEventMask *sccb = (void *)_sccb;

sclp_mark_busy();
+ memset(_sccb, 0, sizeof(*sccb));
sccb->h.length = sizeof(WriteEventMask);
- sccb->mask_length = sizeof(unsigned int);
- sccb->receive_mask = SCLP_EVENT_MASK_MSG_ASCII;
- sccb->cp_receive_mask = SCLP_EVENT_MASK_MSG_ASCII;
- sccb->send_mask = SCLP_EVENT_MASK_MSG_ASCII;
- sccb->cp_send_mask = SCLP_EVENT_MASK_MSG_ASCII;
+ sccb->h.function_code = SCLP_FC_NORMAL_WRITE;
+ sccb->mask_length = sizeof(sccb_mask_t);
+
+ /* For now we don't process sclp input. */
+ sccb->cp_receive_mask = 0;
+ /* We send ASCII and line mode. */
+ sccb->cp_send_mask = SCLP_EVENT_MASK_MSG_ASCII | SCLP_EVENT_MASK_MSG;

sclp_service_call(SCLP_CMD_WRITE_EVENT_MASK, sccb);
+ assert(sccb->h.response_code == SCLP_RC_NORMAL_COMPLETION);
}

void sclp_console_setup(void)
@@ -35,16 +179,19 @@ void sclp_console_setup(void)

void sclp_print(const char *str)
{
- int len = strlen(str);
- WriteEventData *sccb = (void *)_sccb;
-
- sclp_mark_busy();
- sccb->h.length = sizeof(WriteEventData) + len;
- sccb->h.function_code = SCLP_FC_NORMAL_WRITE;
- sccb->ebh.length = sizeof(EventBufferHeader) + len;
- sccb->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA;
- sccb->ebh.flags = 0;
- memcpy(sccb->data, str, len);
-
- sclp_service_call(SCLP_CMD_WRITE_EVENT_DATA, sccb);
+ /*
+ * z/VM advertises a vt220 console which is not functional:
+ * (response code 05F0, "not active because of the state of
+ * the machine"). Hence testing the masks would only work if
+ * we also use stsi data to distinguish z/VM.
+ *
+ * Let's rather print on all available consoles.
+ */
+ if (strlen(str) > (PAGE_SIZE / 2)) {
+ sclp_print_ascii("Warning: Printing is limited to 2KB of data.");
+ sclp_print_lm("Warning: Printing is limited to 2KB of data.");
+ return;
+ }
+ sclp_print_ascii(str);
+ sclp_print_lm(str);
}
diff --git a/lib/s390x/sclp.h b/lib/s390x/sclp.h
index 63cf609..98c482a 100644
--- a/lib/s390x/sclp.h
+++ b/lib/s390x/sclp.h
@@ -179,6 +179,7 @@ typedef struct SCCB {
/* SCLP event masks */
#define SCLP_EVENT_MASK_SIGNAL_QUIESCE 0x00000008
#define SCLP_EVENT_MASK_MSG_ASCII 0x00000040
+#define SCLP_EVENT_MASK_MSG 0x40000000

#define SCLP_UNCONDITIONAL_READ 0x00
#define SCLP_SELECTIVE_READ 0x01
@@ -193,6 +194,55 @@ typedef struct WriteEventMask {
uint32_t receive_mask;
} __attribute__((packed)) WriteEventMask;

+#define MDBTYP_GO 0x0001
+#define MDBTYP_MTO 0x0004
+#define EVTYP_MSG 0x02
+#define LNTPFLGS_CNTLTEXT 0x8000
+#define LNTPFLGS_LABELTEXT 0x4000
+#define LNTPFLGS_DATATEXT 0x2000
+#define LNTPFLGS_ENDTEXT 0x1000
+#define LNTPFLGS_PROMPTTEXT 0x0800
+
+typedef uint32_t sccb_mask_t;
+
+/* SCLP line mode console related structures. */
+
+struct mto {
+ u16 length;
+ u16 type;
+ u16 line_type_flags;
+ u8 alarm_control;
+ u8 _reserved[3];
+} __attribute__((packed));
+
+struct go {
+ u16 length;
+ u16 type;
+ u32 domid;
+ u8 hhmmss_time[8];
+ u8 th_time[3];
+ u8 reserved_0;
+ u8 dddyyyy_date[7];
+ u8 _reserved_1;
+ u16 general_msg_flags;
+ u8 _reserved_2[10];
+ u8 originating_system_name[8];
+ u8 job_guest_name[8];
+} __attribute__((packed));
+
+struct mdb_header {
+ u16 length;
+ u16 type;
+ u32 tag;
+ u32 revision_code;
+} __attribute__((packed));
+
+struct mdb {
+ struct mdb_header header;
+ struct go go;
+ struct mto mto;
+} __attribute__((packed));
+
typedef struct EventBufferHeader {
uint16_t length;
uint8_t type;
@@ -203,7 +253,10 @@ typedef struct EventBufferHeader {
typedef struct WriteEventData {
SCCBHeader h;
EventBufferHeader ebh;
- char data[0];
+ union {
+ char data[0];
+ struct mdb mdb;
+ } msg;
} __attribute__((packed)) WriteEventData;

typedef struct ReadEventData {
--
2.17.0