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Diffstat (limited to 'arch/s390/kernel/setup.c')
-rw-r--r--arch/s390/kernel/setup.c98
1 files changed, 93 insertions, 5 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 25bf7277d31..b1b9a931237 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -50,6 +50,13 @@
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/sections.h>
+#include <asm/compat.h>
+
+long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
+ PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
+long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
+ PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
+ PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
/*
* User copy operations.
@@ -383,6 +390,84 @@ static int __init early_parse_ipldelay(char *p)
}
early_param("ipldelay", early_parse_ipldelay);
+#ifdef CONFIG_S390_SWITCH_AMODE
+unsigned int switch_amode = 0;
+EXPORT_SYMBOL_GPL(switch_amode);
+
+static inline void set_amode_and_uaccess(unsigned long user_amode,
+ unsigned long user32_amode)
+{
+ psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
+ PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
+ PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
+#ifdef CONFIG_COMPAT
+ psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
+ PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
+ PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
+ psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
+ PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
+ PSW32_MASK_PSTATE;
+#endif
+ psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
+ PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
+
+ if (MACHINE_HAS_MVCOS) {
+ printk("mvcos available.\n");
+ memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
+ } else {
+ printk("mvcos not available.\n");
+ memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
+ }
+}
+
+/*
+ * Switch kernel/user addressing modes?
+ */
+static int __init early_parse_switch_amode(char *p)
+{
+ switch_amode = 1;
+ return 0;
+}
+early_param("switch_amode", early_parse_switch_amode);
+
+#else /* CONFIG_S390_SWITCH_AMODE */
+static inline void set_amode_and_uaccess(unsigned long user_amode,
+ unsigned long user32_amode)
+{
+}
+#endif /* CONFIG_S390_SWITCH_AMODE */
+
+#ifdef CONFIG_S390_EXEC_PROTECT
+unsigned int s390_noexec = 0;
+EXPORT_SYMBOL_GPL(s390_noexec);
+
+/*
+ * Enable execute protection?
+ */
+static int __init early_parse_noexec(char *p)
+{
+ if (!strncmp(p, "off", 3))
+ return 0;
+ switch_amode = 1;
+ s390_noexec = 1;
+ return 0;
+}
+early_param("noexec", early_parse_noexec);
+#endif /* CONFIG_S390_EXEC_PROTECT */
+
+static void setup_addressing_mode(void)
+{
+ if (s390_noexec) {
+ printk("S390 execute protection active, ");
+ set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
+ return;
+ }
+ if (switch_amode) {
+ printk("S390 address spaces switched, ");
+ set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
+ }
+}
+
static void __init
setup_lowcore(void)
{
@@ -399,19 +484,21 @@ setup_lowcore(void)
lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
lc->restart_psw.addr =
PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
- lc->external_new_psw.mask = PSW_KERNEL_BITS;
+ if (switch_amode)
+ lc->restart_psw.mask |= PSW_ASC_HOME;
+ lc->external_new_psw.mask = psw_kernel_bits;
lc->external_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
- lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
+ lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
- lc->program_new_psw.mask = PSW_KERNEL_BITS;
+ lc->program_new_psw.mask = psw_kernel_bits;
lc->program_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
lc->mcck_new_psw.mask =
- PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
+ psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
lc->mcck_new_psw.addr =
PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
- lc->io_new_psw.mask = PSW_KERNEL_BITS;
+ lc->io_new_psw.mask = psw_kernel_bits;
lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
lc->ipl_device = S390_lowcore.ipl_device;
lc->jiffy_timer = -1LL;
@@ -645,6 +732,7 @@ setup_arch(char **cmdline_p)
parse_early_param();
setup_memory_end();
+ setup_addressing_mode();
setup_memory();
setup_resources();
setup_lowcore();