diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-02-09 18:24:37 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-02-09 18:24:41 +0100 |
| commit | 6252d702c5311ce916caf75ed82e5c8245171c92 (patch) | |
| tree | 3490f27b5f888ff2c1ec915d4e7201000f37a771 /arch/s390/kernel | |
| parent | 5a216a20837c5f5fa1ca4b8ae8991ffd96b08e6f (diff) | |
[S390] dynamic page tables.
Add support for different number of page table levels dependent
on the highest address used for a process. This will cause a 31 bit
process to use a two level page table instead of the four level page
table that is the default after the pud has been introduced. Likewise
a normal 64 bit process will use three levels instead of four. Only
if a process runs out of the 4 tera bytes which can be addressed with
a three level page table the fourth level is dynamically added. Then
the process can use up to 8 peta byte.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/binfmt_elf32.c | 11 | ||||
| -rw-r--r-- | arch/s390/kernel/traps.c | 3 |
2 files changed, 13 insertions, 1 deletions
diff --git a/arch/s390/kernel/binfmt_elf32.c b/arch/s390/kernel/binfmt_elf32.c index f1e40ca00d8..3e1c315b736 100644 --- a/arch/s390/kernel/binfmt_elf32.c +++ b/arch/s390/kernel/binfmt_elf32.c @@ -134,6 +134,7 @@ static inline int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs) } #include <asm/processor.h> +#include <asm/pgalloc.h> #include <linux/module.h> #include <linux/elfcore.h> #include <linux/binfmts.h> @@ -183,6 +184,16 @@ struct elf_prpsinfo32 #undef start_thread #define start_thread start_thread31 +static inline void start_thread31(struct pt_regs *regs, unsigned long new_psw, + unsigned long new_stackp) +{ + set_fs(USER_DS); + regs->psw.mask = psw_user32_bits; + regs->psw.addr = new_psw; + regs->gprs[15] = new_stackp; + crst_table_downgrade(current->mm, 1UL << 31); +} + MODULE_DESCRIPTION("Binary format loader for compatibility with 32bit Linux for S390 binaries," " Copyright 2000 IBM Corporation"); MODULE_AUTHOR("Gerhard Tonn <ton@de.ibm.com>"); diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c index a4d29025ddb..60f728aeaf1 100644 --- a/arch/s390/kernel/traps.c +++ b/arch/s390/kernel/traps.c @@ -60,6 +60,7 @@ int sysctl_userprocess_debug = 0; extern pgm_check_handler_t do_protection_exception; extern pgm_check_handler_t do_dat_exception; extern pgm_check_handler_t do_monitor_call; +extern pgm_check_handler_t do_asce_exception; #define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; }) @@ -730,7 +731,7 @@ void __init trap_init(void) pgm_check_table[0x12] = &translation_exception; pgm_check_table[0x13] = &special_op_exception; #ifdef CONFIG_64BIT - pgm_check_table[0x38] = &do_dat_exception; + pgm_check_table[0x38] = &do_asce_exception; pgm_check_table[0x39] = &do_dat_exception; pgm_check_table[0x3A] = &do_dat_exception; pgm_check_table[0x3B] = &do_dat_exception; |