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[S390] Improve address space mode selection.

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Introduce user_mode to replace the two variables switch_amode and
s390_noexec. There are three valid combinations of the old values:
  1) switch_amode == 0 && s390_noexec == 0
  2) switch_amode == 1 && s390_noexec == 0
  3) switch_amode == 1 && s390_noexec == 1
They get replaced by
  1) user_mode == HOME_SPACE_MODE
  2) user_mode == PRIMARY_SPACE_MODE
  3) user_mode == SECONDARY_SPACE_MODE
The new kernel parameter user_mode=[primary,secondary,home] lets
you choose the address space mode the user space processes should
use. In addition the CONFIG_S390_SWITCH_AMODE config option
is removed.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2009-12-07 12:51:43 +01:00
committed by Martin Schwidefsky
parent 61365e132e
commit b11b533427
11 changed files with 37 additions and 57 deletions
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15
arch/s390/include/asm/setup.h
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@@ -49,17 +49,12 @@ extern unsigned long memory_end;
void detect_memory_layout(struct mem_chunk chunk[]);
#ifdef CONFIG_S390_SWITCH_AMODE
extern unsigned int switch_amode;
#else
#define switch_amode (0)
#endif
#define PRIMARY_SPACE_MODE 0
#define ACCESS_REGISTER_MODE 1
#define SECONDARY_SPACE_MODE 2
#define HOME_SPACE_MODE 3
#ifdef CONFIG_S390_EXEC_PROTECT
extern unsigned int s390_noexec;
#else
#define s390_noexec (0)
#endif
extern unsigned int user_mode;
/*
* Machine features detected in head.S