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S390: ccw firmware: Add sclp output

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In order to communicate with the user, we need an I/O mechanism that he
can read. Implement SCLP ASCII support, which happens to be the default
in the s390 ccw machine.

This file is missing read support for now. It can only print messages.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2013-04-22 20:59:25 +02:00
parent 92f2ca38b0
commit 0369b2eb07
2 changed files with 188 additions and 0 deletions
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81
pc-bios/s390-ccw/sclp-ascii.c Normal file
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/*
* 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);
}

107
pc-bios/s390-ccw/sclp.h Normal file
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/*
* 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 */