diff options
Diffstat (limited to 'arch/s390/kernel/setup.c')
| -rw-r--r-- | arch/s390/kernel/setup.c | 178 |
1 files changed, 170 insertions, 8 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index b1b9a931237d..2569aafcc543 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -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 |
