Viewing file:  hwc_cpi.c (5.11 KB) -rw-r--r--
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/*
* Author: Martin Peschke <mpeschke@de.ibm.com>
* Copyright (C) 2001 IBM Entwicklung GmbH, IBM Corporation
*/
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/version.h>
#include <asm/semaphore.h>
#include <asm/ebcdic.h>
#include "hwc_rw.h"
#include "hwc.h"
#define CPI_RETRIES 3
#define CPI_SLEEP_TICKS 50
#define CPI_LENGTH_SYSTEM_TYPE 8
#define CPI_LENGTH_SYSTEM_NAME 8
#define CPI_LENGTH_SYSPLEX_NAME 8
typedef struct {
_EBUF_HEADER
u8 id_format;
u8 reserved0;
u8 system_type[CPI_LENGTH_SYSTEM_TYPE];
u64 reserved1;
u8 system_name[CPI_LENGTH_SYSTEM_NAME];
u64 reserved2;
u64 system_level;
u64 reserved3;
u8 sysplex_name[CPI_LENGTH_SYSPLEX_NAME];
u8 reserved4[16];
} __attribute__ ((packed))
cpi_evbuf_t;
typedef struct _cpi_hwcb_t {
_HWCB_HEADER
cpi_evbuf_t cpi_evbuf;
} __attribute__ ((packed))
cpi_hwcb_t;
cpi_hwcb_t *cpi_hwcb;
static int __init cpi_module_init (void);
static void __exit cpi_module_exit (void);
module_init (cpi_module_init);
module_exit (cpi_module_exit);
MODULE_AUTHOR (
"Martin Peschke, IBM Deutschland Entwicklung GmbH "
"<mpeschke@de.ibm.com>");
MODULE_DESCRIPTION (
"identify this operating system instance to the S/390 or zSeries hardware");
static char *system_name = NULL;
MODULE_PARM (system_name, "s");
MODULE_PARM_DESC (system_name, "e.g. hostname - max. 8 characters");
static char *sysplex_name = NULL;
#ifdef ALLOW_SYSPLEX_NAME
MODULE_PARM (sysplex_name, "s");
MODULE_PARM_DESC (sysplex_name, "if applicable - max. 8 characters");
#endif
static char *system_type = "LINUX";
hwc_request_t cpi_request =
{};
hwc_callback_t cpi_callback;
static DECLARE_MUTEX_LOCKED (sem);
static int __init
cpi_module_init (void)
{
int retval;
int system_type_length;
int system_name_length;
int sysplex_name_length = 0;
int retries;
if (!MACHINE_HAS_HWC) {
printk ("cpi: bug: hardware console not present\n");
retval = -EINVAL;
goto out;
}
if (!system_type) {
printk ("cpi: bug: no system type specified\n");
retval = -EINVAL;
goto out;
}
system_type_length = strlen (system_type);
if (system_type_length > CPI_LENGTH_SYSTEM_NAME) {
printk ("cpi: bug: system type has length of %i characters - "
"only %i characters supported\n",
system_type_length,
CPI_LENGTH_SYSTEM_TYPE);
retval = -EINVAL;
goto out;
}
if (!system_name) {
printk ("cpi: no system name specified\n");
retval = -EINVAL;
goto out;
}
system_name_length = strlen (system_name);
if (system_name_length > CPI_LENGTH_SYSTEM_NAME) {
printk ("cpi: system name has length of %i characters - "
"only %i characters supported\n",
system_name_length,
CPI_LENGTH_SYSTEM_NAME);
retval = -EINVAL;
goto out;
}
if (sysplex_name) {
sysplex_name_length = strlen (sysplex_name);
if (sysplex_name_length > CPI_LENGTH_SYSPLEX_NAME) {
printk ("cpi: sysplex name has length of %i characters - "
"only %i characters supported\n",
sysplex_name_length,
CPI_LENGTH_SYSPLEX_NAME);
retval = -EINVAL;
goto out;
}
}
cpi_hwcb = kmalloc (sizeof (cpi_hwcb_t), GFP_KERNEL);
if (!cpi_hwcb) {
printk ("cpi: no storage to fulfill request\n");
retval = -ENOMEM;
goto out;
}
memset (cpi_hwcb, 0, sizeof (cpi_hwcb_t));
cpi_hwcb->length = sizeof (cpi_hwcb_t);
cpi_hwcb->cpi_evbuf.length = sizeof (cpi_evbuf_t);
cpi_hwcb->cpi_evbuf.type = 0x0B;
memset (cpi_hwcb->cpi_evbuf.system_type, ' ', CPI_LENGTH_SYSTEM_TYPE);
memcpy (cpi_hwcb->cpi_evbuf.system_type, system_type, system_type_length);
HWC_ASCEBC_STR (cpi_hwcb->cpi_evbuf.system_type, CPI_LENGTH_SYSTEM_TYPE);
EBC_TOUPPER (cpi_hwcb->cpi_evbuf.system_type, CPI_LENGTH_SYSTEM_TYPE);
memset (cpi_hwcb->cpi_evbuf.system_name, ' ', CPI_LENGTH_SYSTEM_NAME);
memcpy (cpi_hwcb->cpi_evbuf.system_name, system_name, system_name_length);
HWC_ASCEBC_STR (cpi_hwcb->cpi_evbuf.system_name, CPI_LENGTH_SYSTEM_NAME);
EBC_TOUPPER (cpi_hwcb->cpi_evbuf.system_name, CPI_LENGTH_SYSTEM_NAME);
cpi_hwcb->cpi_evbuf.system_level = LINUX_VERSION_CODE;
if (sysplex_name) {
memset (cpi_hwcb->cpi_evbuf.sysplex_name, ' ', CPI_LENGTH_SYSPLEX_NAME);
memcpy (cpi_hwcb->cpi_evbuf.sysplex_name, sysplex_name, sysplex_name_length);
HWC_ASCEBC_STR (cpi_hwcb->cpi_evbuf.sysplex_name, CPI_LENGTH_SYSPLEX_NAME);
EBC_TOUPPER (cpi_hwcb->cpi_evbuf.sysplex_name, CPI_LENGTH_SYSPLEX_NAME);
}
cpi_request.block = cpi_hwcb;
cpi_request.word = HWC_CMDW_WRITEDATA;
cpi_request.callback = cpi_callback;
for (retries = CPI_RETRIES; retries; retries--) {
retval = hwc_send (&cpi_request);
if (retval) {
set_current_state (TASK_INTERRUPTIBLE);
schedule_timeout (CPI_SLEEP_TICKS);
} else {
down (&sem);
switch (cpi_hwcb->response_code) {
case 0x0020:
printk ("cpi: succeeded\n");
break;
default:
printk ("cpi: failed with response code 0x%x\n",
cpi_hwcb->response_code);
}
goto free;
}
}
printk ("cpi: failed (%i)\n", retval);
free:
kfree (cpi_hwcb);
out:
return retval;
}
static void __exit
cpi_module_exit (void)
{
printk ("cpi: exit\n");
}
void
cpi_callback (hwc_request_t * req)
{
up (&sem);
}
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