ab14de6c37
Hopefully this will make it more maintainable and less error prone. Code makes use of search_exception_tables(). Since it calls this function before the kernel exeception table is sorted, there is an early call to sort_main_extable(). This way it's easy to use the already present infrastructure of fixup sections. Also this would allows to easily convert the rest of head[31|64].S into C code. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
/*
|
|
* drivers/s390/char/sclp_info.c
|
|
*
|
|
* Copyright IBM Corp. 2007
|
|
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <asm/sclp.h>
|
|
#include "sclp.h"
|
|
|
|
struct sclp_readinfo_sccb s390_readinfo_sccb;
|
|
|
|
void __init sclp_readinfo_early(void)
|
|
{
|
|
sclp_cmdw_t command;
|
|
struct sccb_header *sccb;
|
|
int ret;
|
|
|
|
__ctl_set_bit(0, 9); /* enable service signal subclass mask */
|
|
|
|
sccb = &s390_readinfo_sccb.header;
|
|
command = SCLP_CMDW_READ_SCP_INFO_FORCED;
|
|
while (1) {
|
|
u16 response;
|
|
|
|
memset(&s390_readinfo_sccb, 0, sizeof(s390_readinfo_sccb));
|
|
sccb->length = sizeof(s390_readinfo_sccb);
|
|
sccb->control_mask[2] = 0x80;
|
|
|
|
ret = sclp_service_call(command, &s390_readinfo_sccb);
|
|
|
|
if (ret == -EIO)
|
|
goto out;
|
|
if (ret == -EBUSY)
|
|
continue;
|
|
|
|
__load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT |
|
|
PSW_MASK_WAIT | PSW_DEFAULT_KEY);
|
|
local_irq_disable();
|
|
barrier();
|
|
|
|
response = sccb->response_code;
|
|
|
|
if (response == 0x10)
|
|
break;
|
|
|
|
if (response != 0x1f0 || command == SCLP_CMDW_READ_SCP_INFO)
|
|
break;
|
|
|
|
command = SCLP_CMDW_READ_SCP_INFO;
|
|
}
|
|
out:
|
|
__ctl_clear_bit(0, 9); /* disable service signal subclass mask */
|
|
}
|