Commit fe355b7f authored by Hongjie Yang's avatar Hongjie Yang Committed by Martin Schwidefsky
Browse files

[S390] boot from NSS support



Add support to boot from a named saved segment (NSS).
Signed-off-by: default avatarHongjie Yang <hongjie@us.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 1b278294
......@@ -51,20 +51,12 @@ startup_continue:
st %r15,__LC_KERNEL_STACK # set end of kernel stack
ahi %r15,-96
xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
l %r14,.Lipl_save_parameters-.LPG1(%r13)
basr %r14,%r14
#
# clear bss memory
# Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
# and create a kernel NSS if the SAVESYS= parm is defined
#
l %r2,.Lbss_bgn-.LPG1(%r13) # start of bss
l %r3,.Lbss_end-.LPG1(%r13) # end of bss
sr %r3,%r2 # length of bss
sr %r4,%r4
sr %r5,%r5 # set src,length and pad to zero
sr %r0,%r0
mvcle %r2,%r4,0 # clear mem
jo .-4 # branch back, if not finish
l %r14,.Lstartup_init-.LPG1(%r13)
basr %r14,%r14
l %r2,.Lrcp-.LPG1(%r13) # Read SCP forced command word
.Lservicecall:
......@@ -125,10 +117,10 @@ startup_continue:
b .Lfchunk-.LPG1(%r13)
.align 4
.Lipl_save_parameters:
.long ipl_save_parameters
.Linittu:
.long init_thread_union
.Lstartup_init:
.long startup_init
.Lpmask:
.byte 0
.align 8
......@@ -206,20 +198,6 @@ startup_continue:
jl .Lloop
.Ldonemem:
l %r12,.Lmflags-.LPG1(%r13) # get address of machine_flags
#
# find out if we are running under VM
#
stidp __LC_CPUID # store cpuid
tm __LC_CPUID,0xff # running under VM ?
bno .Lnovm-.LPG1(%r13)
oi 3(%r12),1 # set VM flag
.Lnovm:
lh %r0,__LC_CPUID+4 # get cpu version
chi %r0,0x7490 # running on a P/390 ?
bne .Lnop390-.LPG1(%r13)
oi 3(%r12),4 # set P/390 flag
.Lnop390:
#
# find out if we have an IEEE fpu
#
......
......@@ -58,18 +58,11 @@ startup_continue:
stg %r15,__LC_KERNEL_STACK # set end of kernel stack
aghi %r15,-160
xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear backchain
brasl %r14,ipl_save_parameters
#
# clear bss memory
# Save ipl parameters, clear bss memory, initialize storage key for kernel pages,
# and create a kernel NSS if the SAVESYS= parm is defined
#
larl %r2,__bss_start # start of bss segment
larl %r3,_end # end of bss segment
sgr %r3,%r2 # length of bss
sgr %r4,%r4 #
sgr %r5,%r5 # set src,length and pad to zero
mvcle %r2,%r4,0 # clear mem
jo .-4 # branch back, if not finish
brasl %r14,startup_init
# set program check new psw mask
mvc __LC_PGM_NEW_PSW(8),.Lpcmsk-.LPG1(%r13)
larl %r1,.Lslowmemdetect # set program check address
......@@ -78,6 +71,10 @@ startup_continue:
diag %r0,%r1,0x260 # get memory size of virtual machine
cgr %r0,%r1 # different? -> old detection routine
jne .Lslowmemdetect
larl %r3,ipl_flags
llgt %r3,0(%r3)
chi %r3,4 # ipled from an kernel NSS
je .Lslowmemdetect
aghi %r1,1 # size is one more than end
larl %r2,memory_chunk
stg %r1,8(%r2) # store size of chunk
......@@ -225,19 +222,6 @@ startup_continue:
.Ldonemem:
larl %r12,machine_flags
#
# find out if we are running under VM
#
stidp __LC_CPUID # store cpuid
tm __LC_CPUID,0xff # running under VM ?
bno 0f-.LPG1(%r13)
oi 7(%r12),1 # set VM flag
0: lh %r0,__LC_CPUID+4 # get cpu version
chi %r0,0x7490 # running on a P/390 ?
bne 1f-.LPG1(%r13)
oi 7(%r12),4 # set P/390 flag
1:
#
# find out if we have the MVPG instruction
#
......
......@@ -34,12 +34,14 @@ enum ipl_type {
IPL_TYPE_UNKNOWN = 2,
IPL_TYPE_CCW = 4,
IPL_TYPE_FCP = 8,
IPL_TYPE_NSS = 16,
};
#define IPL_NONE_STR "none"
#define IPL_UNKNOWN_STR "unknown"
#define IPL_CCW_STR "ccw"
#define IPL_FCP_STR "fcp"
#define IPL_NSS_STR "nss"
static char *ipl_type_str(enum ipl_type type)
{
......@@ -50,6 +52,8 @@ static char *ipl_type_str(enum ipl_type type)
return IPL_CCW_STR;
case IPL_TYPE_FCP:
return IPL_FCP_STR;
case IPL_TYPE_NSS:
return IPL_NSS_STR;
case IPL_TYPE_UNKNOWN:
default:
return IPL_UNKNOWN_STR;
......@@ -64,6 +68,7 @@ enum ipl_method {
IPL_METHOD_FCP_RO_DIAG,
IPL_METHOD_FCP_RW_DIAG,
IPL_METHOD_FCP_RO_VM,
IPL_METHOD_NSS,
};
enum shutdown_action {
......@@ -114,11 +119,14 @@ enum diag308_rc {
static int diag308_set_works = 0;
static int reipl_capabilities = IPL_TYPE_UNKNOWN;
static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
static enum ipl_method reipl_method = IPL_METHOD_NONE;
static struct ipl_parameter_block *reipl_block_fcp;
static struct ipl_parameter_block *reipl_block_ccw;
static char reipl_nss_name[NSS_NAME_SIZE + 1];
static int dump_capabilities = IPL_TYPE_NONE;
static enum ipl_type dump_type = IPL_TYPE_NONE;
static enum ipl_method dump_method = IPL_METHOD_NONE;
......@@ -173,6 +181,24 @@ static struct subsys_attribute sys_##_prefix##_##_name##_attr = \
sys_##_prefix##_##_name##_show, \
sys_##_prefix##_##_name##_store);
#define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
static ssize_t sys_##_prefix##_##_name##_show(struct subsystem *subsys, \
char *page) \
{ \
return sprintf(page, _fmt_out, _value); \
} \
static ssize_t sys_##_prefix##_##_name##_store(struct subsystem *subsys,\
const char *buf, size_t len) \
{ \
if (sscanf(buf, _fmt_in, _value) != 1) \
return -EINVAL; \
return len; \
} \
static struct subsys_attribute sys_##_prefix##_##_name##_attr = \
__ATTR(_name,(S_IRUGO | S_IWUSR), \
sys_##_prefix##_##_name##_show, \
sys_##_prefix##_##_name##_store);
static void make_attrs_ro(struct attribute **attrs)
{
while (*attrs) {
......@@ -189,6 +215,8 @@ static enum ipl_type ipl_get_type(void)
{
struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
if (ipl_flags & IPL_NSS_VALID)
return IPL_TYPE_NSS;
if (!(ipl_flags & IPL_DEVNO_VALID))
return IPL_TYPE_UNKNOWN;
if (!(ipl_flags & IPL_PARMBLOCK_VALID))
......@@ -324,6 +352,20 @@ static struct attribute_group ipl_ccw_attr_group = {
.attrs = ipl_ccw_attrs,
};
/* NSS ipl device attributes */
DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
static struct attribute *ipl_nss_attrs[] = {
&sys_ipl_type_attr.attr,
&sys_ipl_nss_name_attr.attr,
NULL,
};
static struct attribute_group ipl_nss_attr_group = {
.attrs = ipl_nss_attrs,
};
/* UNKNOWN ipl device attributes */
static struct attribute *ipl_unknown_attrs[] = {
......@@ -432,6 +474,21 @@ static struct attribute_group reipl_ccw_attr_group = {
.attrs = reipl_ccw_attrs,
};
/* NSS reipl device attributes */
DEFINE_IPL_ATTR_STR_RW(reipl_nss, name, "%s\n", "%s\n", reipl_nss_name);
static struct attribute *reipl_nss_attrs[] = {
&sys_reipl_nss_name_attr.attr,
NULL,
};
static struct attribute_group reipl_nss_attr_group = {
.name = IPL_NSS_STR,
.attrs = reipl_nss_attrs,
};
/* reipl type */
static int reipl_set_type(enum ipl_type type)
......@@ -454,6 +511,9 @@ static int reipl_set_type(enum ipl_type type)
else
reipl_method = IPL_METHOD_FCP_RO_DIAG;
break;
case IPL_TYPE_NSS:
reipl_method = IPL_METHOD_NSS;
break;
default:
reipl_method = IPL_METHOD_NONE;
}
......@@ -475,6 +535,8 @@ static ssize_t reipl_type_store(struct subsystem *subsys, const char *buf,
rc = reipl_set_type(IPL_TYPE_CCW);
else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
rc = reipl_set_type(IPL_TYPE_FCP);
else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
rc = reipl_set_type(IPL_TYPE_NSS);
return (rc != 0) ? rc : len;
}
......@@ -647,6 +709,10 @@ void do_reipl(void)
case IPL_METHOD_FCP_RO_VM:
__cpcmd("IPL", NULL, 0, NULL);
break;
case IPL_METHOD_NSS:
sprintf(buf, "IPL %s", reipl_nss_name);
__cpcmd(buf, NULL, 0, NULL);
break;
case IPL_METHOD_NONE:
default:
if (MACHINE_IS_VM)
......@@ -733,6 +799,10 @@ static int __init ipl_init(void)
case IPL_TYPE_FCP:
rc = ipl_register_fcp_files();
break;
case IPL_TYPE_NSS:
rc = sysfs_create_group(&ipl_subsys.kset.kobj,
&ipl_nss_attr_group);
break;
default:
rc = sysfs_create_group(&ipl_subsys.kset.kobj,
&ipl_unknown_attr_group);
......@@ -755,6 +825,20 @@ static void __init reipl_probe(void)
free_page((unsigned long)buffer);
}
static int __init reipl_nss_init(void)
{
int rc;
if (!MACHINE_IS_VM)
return 0;
rc = sysfs_create_group(&reipl_subsys.kset.kobj, &reipl_nss_attr_group);
if (rc)
return rc;
strncpy(reipl_nss_name, kernel_nss_name, NSS_NAME_SIZE + 1);
reipl_capabilities |= IPL_TYPE_NSS;
return 0;
}
static int __init reipl_ccw_init(void)
{
int rc;
......@@ -835,6 +919,9 @@ static int __init reipl_init(void)
if (rc)
return rc;
rc = reipl_fcp_init();
if (rc)
return rc;
rc = reipl_nss_init();
if (rc)
return rc;
rc = reipl_set_type(ipl_get_type());
......
......@@ -38,6 +38,7 @@
#include <linux/device.h>
#include <linux/notifier.h>
#include <linux/pfn.h>
#include <linux/ctype.h>
#include <linux/reboot.h>
#include <asm/uaccess.h>
......@@ -50,6 +51,7 @@
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/sections.h>
#include <asm/ebcdic.h>
#include <asm/compat.h>
long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
......@@ -282,6 +284,140 @@ static void __init conmode_default(void)
}
}
/*
* Create a Kernel NSS if the SAVESYS= parameter is defined
*/
#define DEFSYS_CMD_SIZE 96
#define SAVESYS_CMD_SIZE 32
extern int _eshared;
char kernel_nss_name[NSS_NAME_SIZE + 1];
#ifdef CONFIG_SHARED_KERNEL
static __init void create_kernel_nss(void)
{
unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
#ifdef CONFIG_BLK_DEV_INITRD
unsigned int sinitrd_pfn, einitrd_pfn;
#endif
int response;
char *savesys_ptr;
char upper_command_line[COMMAND_LINE_SIZE];
char defsys_cmd[DEFSYS_CMD_SIZE];
char savesys_cmd[SAVESYS_CMD_SIZE];
/* Do nothing if we are not running under VM */
if (!MACHINE_IS_VM)
return;
/* Convert COMMAND_LINE to upper case */
for (i = 0; i < strlen(COMMAND_LINE); i++)
upper_command_line[i] = toupper(COMMAND_LINE[i]);
savesys_ptr = strstr(upper_command_line, "SAVESYS=");
if (!savesys_ptr)
return;
savesys_ptr += 8; /* Point to the beginning of the NSS name */
for (i = 0; i < NSS_NAME_SIZE; i++) {
if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
break;
kernel_nss_name[i] = savesys_ptr[i];
}
stext_pfn = PFN_DOWN(__pa(&_stext));
eshared_pfn = PFN_DOWN(__pa(&_eshared));
end_pfn = PFN_UP(__pa(&_end));
min_size = end_pfn << 2;
sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
eshared_pfn, end_pfn);
#ifdef CONFIG_BLK_DEV_INITRD
if (INITRD_START && INITRD_SIZE) {
sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
min_size = einitrd_pfn << 2;
sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
sinitrd_pfn, einitrd_pfn);
}
#endif
sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK", defsys_cmd, min_size);
sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
kernel_nss_name, kernel_nss_name);
__cpcmd(defsys_cmd, NULL, 0, &response);
if (response != 0)
return;
__cpcmd(savesys_cmd, NULL, 0, &response);
if (response != strlen(savesys_cmd))
return;
ipl_flags = IPL_NSS_VALID;
}
#else /* CONFIG_SHARED_KERNEL */
static inline void create_kernel_nss(void) { }
#endif /* CONFIG_SHARED_KERNEL */
/*
* Clear bss memory
*/
static __init void clear_bss_section(void)
{
memset(__bss_start, 0, _end - __bss_start);
}
/*
* Initialize storage key for kernel pages
*/
static __init void init_kernel_storage_key(void)
{
unsigned long end_pfn, init_pfn;
end_pfn = PFN_UP(__pa(&_end));
for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
}
static __init void detect_machine_type(void)
{
struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
asm volatile("stidp %0" : "=m" (S390_lowcore.cpu_data.cpu_id));
/* Running under z/VM ? */
if (cpuinfo->cpu_id.version == 0xff)
machine_flags |= 1;
/* Running on a P/390 ? */
if (cpuinfo->cpu_id.machine == 0x7490)
machine_flags |= 4;
}
/*
* Save ipl parameters, clear bss memory, initialize storage keys
* and create a kernel NSS at startup if the SAVESYS= parm is defined
*/
void __init startup_init(void)
{
ipl_save_parameters();
clear_bss_section();
init_kernel_storage_key();
lockdep_init();
detect_machine_type();
create_kernel_nss();
}
#ifdef CONFIG_SMP
void (*_machine_restart)(char *command) = machine_restart_smp;
void (*_machine_halt)(void) = machine_halt_smp;
......@@ -523,7 +659,7 @@ setup_lowcore(void)
static void __init
setup_resources(void)
{
struct resource *res;
struct resource *res, *sub_res;
int i;
code_resource.start = (unsigned long) &_text;
......@@ -548,8 +684,38 @@ setup_resources(void)
res->start = memory_chunk[i].addr;
res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
request_resource(&iomem_resource, res);
request_resource(res, &code_resource);
request_resource(res, &data_resource);
if (code_resource.start >= res->start &&
code_resource.start <= res->end &&
code_resource.end > res->end) {
sub_res = alloc_bootmem_low(sizeof(struct resource));
memcpy(sub_res, &code_resource,
sizeof(struct resource));
sub_res->end = res->end;
code_resource.start = res->end + 1;
request_resource(res, sub_res);
}
if (code_resource.start >= res->start &&
code_resource.start <= res->end &&
code_resource.end <= res->end)
request_resource(res, &code_resource);
if (data_resource.start >= res->start &&
data_resource.start <= res->end &&
data_resource.end > res->end) {
sub_res = alloc_bootmem_low(sizeof(struct resource));
memcpy(sub_res, &data_resource,
sizeof(struct resource));
sub_res->end = res->end;
data_resource.start = res->end + 1;
request_resource(res, sub_res);
}
if (data_resource.start >= res->start &&
data_resource.start <= res->end &&
data_resource.end <= res->end)
request_resource(res, &data_resource);
}
}
......@@ -585,7 +751,7 @@ static void __init
setup_memory(void)
{
unsigned long bootmap_size;
unsigned long start_pfn, end_pfn, init_pfn;
unsigned long start_pfn, end_pfn;
int i;
/*
......@@ -595,10 +761,6 @@ setup_memory(void)
start_pfn = PFN_UP(__pa(&_end));
end_pfn = max_pfn = PFN_DOWN(memory_end);
/* Initialize storage key for kernel pages */
for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
#ifdef CONFIG_BLK_DEV_INITRD
/*
* Move the initrd in case the bitmap of the bootmem allocater
......
......@@ -31,11 +31,6 @@ SECTIONS
_etext = .; /* End of text section */
. = ALIGN(16); /* Exception table */
__start___ex_table = .;
__ex_table : { *(__ex_table) }
__stop___ex_table = .;
RODATA
#ifdef CONFIG_SHARED_KERNEL
......@@ -44,6 +39,11 @@ SECTIONS
_eshared = .; /* End of shareable data */
#endif
. = ALIGN(16); /* Exception table */
__start___ex_table = .;
__ex_table : { *(__ex_table) }
__stop___ex_table = .;
.data : { /* Data */
*(.data)
CONSTRUCTORS
......
......@@ -156,13 +156,19 @@ struct ipl_parameter_block {
extern u32 ipl_flags;
extern u16 ipl_devno;
void do_reipl(void);
extern void do_reipl(void);
extern void ipl_save_parameters(void);
enum {
IPL_DEVNO_VALID = 1,
IPL_PARMBLOCK_VALID = 2,
IPL_NSS_VALID = 4,
};
#define NSS_NAME_SIZE 8
extern char kernel_nss_name[];
#define IPL_PARMBLOCK_START ((struct ipl_parameter_block *) \
IPL_PARMBLOCK_ORIGIN)
#define IPL_PARMBLOCK_SIZE (IPL_PARMBLOCK_START->hdr.len)
......
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