diff options
Diffstat (limited to 'pc-bios')
| -rw-r--r-- | pc-bios/s390-ccw/sclp-ascii.c | 81 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/sclp.h | 107 |
2 files changed, 188 insertions, 0 deletions
diff --git a/pc-bios/s390-ccw/sclp-ascii.c b/pc-bios/s390-ccw/sclp-ascii.c new file mode 100644 index 0000000000..1c93937104 --- /dev/null +++ b/pc-bios/s390-ccw/sclp-ascii.c @@ -0,0 +1,81 @@ +/* + * SCLP ASCII access driver + * + * Copyright (c) 2013 Alexander Graf <agraf@suse.de> + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ + +#include "s390-ccw.h" +#include "sclp.h" + +static char _sccb[PAGE_SIZE] __attribute__((__aligned__(4096))); + +/* Perform service call. Return 0 on success, non-zero otherwise. */ +static int sclp_service_call(unsigned int command, void *sccb) +{ + int cc; + + asm volatile( + " .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */ + " ipm %0\n" + " srl %0,28" + : "=&d" (cc) : "d" (command), "a" (__pa(sccb)) + : "cc", "memory"); + if (cc == 3) + return -EIO; + if (cc == 2) + return -EBUSY; + return 0; +} + +static void sclp_set_write_mask(void) +{ + WriteEventMask *sccb = (void*)_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; + + sclp_service_call(SCLP_CMD_WRITE_EVENT_MASK, sccb); +} + +void sclp_setup(void) +{ + sclp_set_write_mask(); +} + +static int _strlen(const char *str) +{ + int i; + for (i = 0; *str; i++) + str++; + return i; +} + +static void _memcpy(char *dest, const char *src, int len) +{ + int i; + for (i = 0; i < len; i++) + dest[i] = src[i]; +} + +void sclp_print(const char *str) +{ + int len = _strlen(str); + WriteEventData *sccb = (void*)_sccb; + + 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); +} diff --git a/pc-bios/s390-ccw/sclp.h b/pc-bios/s390-ccw/sclp.h new file mode 100644 index 0000000000..3cbfb78930 --- /dev/null +++ b/pc-bios/s390-ccw/sclp.h @@ -0,0 +1,107 @@ +/* + * SCLP ASCII access driver + * + * Copyright (c) 2013 Alexander Graf <agraf@suse.de> + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ + +#ifndef SCLP_H +#define SCLP_H + +/* SCLP command codes */ +#define SCLP_CMDW_READ_SCP_INFO 0x00020001 +#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 +#define SCLP_CMD_READ_EVENT_DATA 0x00770005 +#define SCLP_CMD_WRITE_EVENT_DATA 0x00760005 +#define SCLP_CMD_READ_EVENT_DATA 0x00770005 +#define SCLP_CMD_WRITE_EVENT_DATA 0x00760005 +#define SCLP_CMD_WRITE_EVENT_MASK 0x00780005 + +/* SCLP response codes */ +#define SCLP_RC_NORMAL_READ_COMPLETION 0x0010 +#define SCLP_RC_NORMAL_COMPLETION 0x0020 +#define SCLP_RC_INVALID_SCLP_COMMAND 0x01f0 +#define SCLP_RC_CONTAINED_EQUIPMENT_CHECK 0x0340 +#define SCLP_RC_INSUFFICIENT_SCCB_LENGTH 0x0300 +#define SCLP_RC_INVALID_FUNCTION 0x40f0 +#define SCLP_RC_NO_EVENT_BUFFERS_STORED 0x60f0 +#define SCLP_RC_INVALID_SELECTION_MASK 0x70f0 +#define SCLP_RC_INCONSISTENT_LENGTHS 0x72f0 +#define SCLP_RC_EVENT_BUFFER_SYNTAX_ERROR 0x73f0 +#define SCLP_RC_INVALID_MASK_LENGTH 0x74f0 + +/* Service Call Control Block (SCCB) and its elements */ + +#define SCCB_SIZE 4096 + +#define SCLP_VARIABLE_LENGTH_RESPONSE 0x80 +#define SCLP_EVENT_BUFFER_ACCEPTED 0x80 + +#define SCLP_FC_NORMAL_WRITE 0 + +typedef struct SCCBHeader { + uint16_t length; + uint8_t function_code; + uint8_t control_mask[3]; + uint16_t response_code; +} __attribute__((packed)) SCCBHeader; + +#define SCCB_DATA_LEN (SCCB_SIZE - sizeof(SCCBHeader)) + +typedef struct ReadInfo { + SCCBHeader h; + uint16_t rnmax; + uint8_t rnsize; +} __attribute__((packed)) ReadInfo; + +typedef struct SCCB { + SCCBHeader h; + char data[SCCB_DATA_LEN]; + } __attribute__((packed)) SCCB; + +/* SCLP event types */ +#define SCLP_EVENT_ASCII_CONSOLE_DATA 0x1a +#define SCLP_EVENT_SIGNAL_QUIESCE 0x1d + +/* SCLP event masks */ +#define SCLP_EVENT_MASK_SIGNAL_QUIESCE 0x00000008 +#define SCLP_EVENT_MASK_MSG_ASCII 0x00000040 + +#define SCLP_UNCONDITIONAL_READ 0x00 +#define SCLP_SELECTIVE_READ 0x01 + +typedef struct WriteEventMask { + SCCBHeader h; + uint16_t _reserved; + uint16_t mask_length; + uint32_t cp_receive_mask; + uint32_t cp_send_mask; + uint32_t send_mask; + uint32_t receive_mask; +} __attribute__((packed)) WriteEventMask; + +typedef struct EventBufferHeader { + uint16_t length; + uint8_t type; + uint8_t flags; + uint16_t _reserved; +} __attribute__((packed)) EventBufferHeader; + +typedef struct WriteEventData { + SCCBHeader h; + EventBufferHeader ebh; + char data[0]; +} __attribute__((packed)) WriteEventData; + +typedef struct ReadEventData { + SCCBHeader h; + EventBufferHeader ebh; + uint32_t mask; +} __attribute__((packed)) ReadEventData; + +#define __pa(x) (x) + +#endif /* SCLP_H */ |