diff options
| -rw-r--r-- | arch/s390/kernel/setup.c | 32 |
1 files changed, 23 insertions, 9 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 493876daf51a..e89659f46401 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -369,7 +369,7 @@ void __init arch_call_rest_init(void) : : [_frame] "a" (frame)); } -static void __init setup_lowcore(void) +static void __init setup_lowcore_dat_off(void) { struct lowcore *lc; @@ -380,19 +380,16 @@ static void __init setup_lowcore(void) lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); lc->restart_psw.mask = PSW_KERNEL_BITS; lc->restart_psw.addr = (unsigned long) restart_int_handler; - lc->external_new_psw.mask = PSW_KERNEL_BITS | - PSW_MASK_DAT | PSW_MASK_MCHECK; + lc->external_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; lc->external_new_psw.addr = (unsigned long) ext_int_handler; lc->svc_new_psw.mask = PSW_KERNEL_BITS | - PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; + PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; lc->svc_new_psw.addr = (unsigned long) system_call; - lc->program_new_psw.mask = PSW_KERNEL_BITS | - PSW_MASK_DAT | PSW_MASK_MCHECK; + lc->program_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; lc->program_new_psw.addr = (unsigned long) pgm_check_handler; lc->mcck_new_psw.mask = PSW_KERNEL_BITS; lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; - lc->io_new_psw.mask = PSW_KERNEL_BITS | - PSW_MASK_DAT | PSW_MASK_MCHECK; + lc->io_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_MCHECK; lc->io_new_psw.addr = (unsigned long) io_int_handler; lc->clock_comparator = clock_comparator_max; lc->nodat_stack = ((unsigned long) &init_thread_union) @@ -452,6 +449,17 @@ static void __init setup_lowcore(void) lowcore_ptr[0] = lc; } +static void __init setup_lowcore_dat_on(void) +{ + struct lowcore *lc; + + lc = lowcore_ptr[0]; + lc->external_new_psw.mask |= PSW_MASK_DAT; + lc->svc_new_psw.mask |= PSW_MASK_DAT; + lc->program_new_psw.mask |= PSW_MASK_DAT; + lc->io_new_psw.mask |= PSW_MASK_DAT; +} + static struct resource code_resource = { .name = "Kernel code", .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, @@ -1081,7 +1089,7 @@ void __init setup_arch(char **cmdline_p) #endif setup_resources(); - setup_lowcore(); + setup_lowcore_dat_off(); smp_fill_possible_mask(); cpu_detect_mhz_feature(); cpu_init(); @@ -1094,6 +1102,12 @@ void __init setup_arch(char **cmdline_p) */ paging_init(); + /* + * After paging_init created the kernel page table, the new PSWs + * in lowcore can now run with DAT enabled. + */ + setup_lowcore_dat_on(); + /* Setup default console */ conmode_default(); set_preferred_console(); |