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// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ctype.h>
#include <asm/ebcdic.h>
#include <asm/sclp.h>
#include <asm/sections.h>
#include <asm/boot_data.h>
#include <asm/facility.h>
#include "boot.h"
char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
struct ipl_parameter_block __bootdata(early_ipl_block);
int __bootdata(early_ipl_block_valid);
unsigned long __bootdata(memory_end);
int __bootdata(memory_end_set);
int __bootdata(noexec_disabled);
static inline int __diag308(unsigned long subcode, void *addr)
{
register unsigned long _addr asm("0") = (unsigned long)addr;
register unsigned long _rc asm("1") = 0;
unsigned long reg1, reg2;
psw_t old = S390_lowcore.program_new_psw;
asm volatile(
" epsw %0,%1\n"
" st %0,%[psw_pgm]\n"
" st %1,%[psw_pgm]+4\n"
" larl %0,1f\n"
" stg %0,%[psw_pgm]+8\n"
" diag %[addr],%[subcode],0x308\n"
"1: nopr %%r7\n"
: "=&d" (reg1), "=&a" (reg2),
[psw_pgm] "=Q" (S390_lowcore.program_new_psw),
[addr] "+d" (_addr), "+d" (_rc)
: [subcode] "d" (subcode)
: "cc", "memory");
S390_lowcore.program_new_psw = old;
return _rc;
}
void store_ipl_parmblock(void)
{
int rc;
rc = __diag308(DIAG308_STORE, &early_ipl_block);
if (rc == DIAG308_RC_OK &&
early_ipl_block.hdr.version <= IPL_MAX_SUPPORTED_VERSION)
early_ipl_block_valid = 1;
}
static size_t scpdata_length(const char *buf, size_t count)
{
while (count) {
if (buf[count - 1] != '\0' && buf[count - 1] != ' ')
break;
count--;
}
return count;
}
static size_t ipl_block_get_ascii_scpdata(char *dest, size_t size,
const struct ipl_parameter_block *ipb)
{
size_t count;
size_t i;
int has_lowercase;
count = min(size - 1, scpdata_length(ipb->ipl_info.fcp.scp_data,
ipb->ipl_info.fcp.scp_data_len));
if (!count)
goto out;
has_lowercase = 0;
for (i = 0; i < count; i++) {
if (!isascii(ipb->ipl_info.fcp.scp_data[i])) {
count = 0;
goto out;
}
if (!has_lowercase && islower(ipb->ipl_info.fcp.scp_data[i]))
has_lowercase = 1;
}
if (has_lowercase)
memcpy(dest, ipb->ipl_info.fcp.scp_data, count);
else
for (i = 0; i < count; i++)
dest[i] = tolower(ipb->ipl_info.fcp.scp_data[i]);
out:
dest[count] = '\0';
return count;
}
static void append_ipl_block_parm(void)
{
char *parm, *delim;
size_t len, rc = 0;
len = strlen(early_command_line);
delim = early_command_line + len; /* '\0' character position */
parm = early_command_line + len + 1; /* append right after '\0' */
switch (early_ipl_block.hdr.pbt) {
case DIAG308_IPL_TYPE_CCW:
rc = ipl_block_get_ascii_vmparm(
parm, COMMAND_LINE_SIZE - len - 1, &early_ipl_block);
break;
case DIAG308_IPL_TYPE_FCP:
rc = ipl_block_get_ascii_scpdata(
parm, COMMAND_LINE_SIZE - len - 1, &early_ipl_block);
break;
}
if (rc) {
if (*parm == '=')
memmove(early_command_line, parm + 1, rc);
else
*delim = ' '; /* replace '\0' with space */
}
}
static inline int has_ebcdic_char(const char *str)
{
int i;
for (i = 0; str[i]; i++)
if (str[i] & 0x80)
return 1;
return 0;
}
void setup_boot_command_line(void)
{
COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
/* convert arch command line to ascii if necessary */
if (has_ebcdic_char(COMMAND_LINE))
EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
/* copy arch command line */
strcpy(early_command_line, strim(COMMAND_LINE));
/* append IPL PARM data to the boot command line */
if (early_ipl_block_valid)
append_ipl_block_parm();
}
static void modify_facility(unsigned long nr, bool clear)
{
if (clear)
__clear_facility(nr, S390_lowcore.stfle_fac_list);
else
__set_facility(nr, S390_lowcore.stfle_fac_list);
}
static void check_cleared_facilities(void)
{
unsigned long als[] = { FACILITIES_ALS };
int i;
for (i = 0; i < ARRAY_SIZE(als); i++) {
if ((S390_lowcore.stfle_fac_list[i] & als[i]) != als[i]) {
sclp_early_printk("Warning: The Linux kernel requires facilities cleared via command line option\n");
print_missing_facilities();
break;
}
}
}
static void modify_fac_list(char *str)
{
unsigned long val, endval;
char *endp;
bool clear;
while (*str) {
clear = false;
if (*str == '!') {
clear = true;
str++;
}
val = simple_strtoull(str, &endp, 0);
if (str == endp)
break;
str = endp;
if (*str == '-') {
str++;
endval = simple_strtoull(str, &endp, 0);
if (str == endp)
break;
str = endp;
while (val <= endval) {
modify_facility(val, clear);
val++;
}
} else {
modify_facility(val, clear);
}
if (*str != ',')
break;
str++;
}
check_cleared_facilities();
}
static char command_line_buf[COMMAND_LINE_SIZE] __section(.data);
void parse_boot_command_line(void)
{
char *param, *val;
bool enabled;
char *args;
int rc;
args = strcpy(command_line_buf, early_command_line);
while (*args) {
args = next_arg(args, ¶m, &val);
if (!strcmp(param, "mem")) {
memory_end = memparse(val, NULL);
memory_end_set = 1;
}
if (!strcmp(param, "noexec")) {
rc = kstrtobool(val, &enabled);
if (!rc && !enabled)
noexec_disabled = 1;
}
if (!strcmp(param, "facilities"))
modify_fac_list(val);
}
}
void setup_memory_end(void)
{
#ifdef CONFIG_CRASH_DUMP
if (!OLDMEM_BASE && early_ipl_block_valid &&
early_ipl_block.hdr.pbt == DIAG308_IPL_TYPE_FCP &&
early_ipl_block.ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP) {
if (!sclp_early_get_hsa_size(&memory_end) && memory_end)
memory_end_set = 1;
}
#endif
}
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