m68k: merge MMU and non MMU versions of system.h
Subsystems (2)
PATCH 1/1 m68k: merge MMU and non MMU versions of system.h
From: Greg Ungerer <[email protected]>
The non-MMU m68k targets can use the same asm/system.h as the MMU targets. So switch the current system_mm.h to be system.h and remove system_no.h.
The assembly support code for the non-MMU resume functions needs to be modified to match the now common switch_to() macro. Specifically this means correctly saving and restoring the status flags in the case of the ColdFire resume, and some reordering of the code to not use registers before they are saved or after they are restored.
Signed-off-by Greg Ungerer <[email protected]>
--- arch/m68k/include/asm/entry_no.h | 12 +- arch/m68k/include/asm/system.h | 194 ++++++++++++++++++++++++++++++++++- arch/m68k/include/asm/system_mm.h | 193 ---------------------------------- arch/m68k/include/asm/system_no.h | 153 --------------------------- arch/m68k/platform/68328/entry.S | 13 +-- arch/m68k/platform/68360/entry.S | 13 +-- arch/m68k/platform/coldfire/entry.S | 24 +++-- 7 files changed, 222 insertions(+), 380 deletions(-) delete mode 100644 arch/m68k/include/asm/system_mm.h delete mode 100644 arch/m68k/include/asm/system_no.h
arch/m68k/include/asm/entry_no.h +6 -6
@@ -96,11 +96,11 @@ .endm .macro RDUSP - movel sw_usp,%a2 + movel sw_usp,%a3 .endm .macro WRUSP - movel %a0,sw_usp + movel %a3,sw_usp .endm #else /* !CONFIG_COLDFIRE_SW_A7 */
@@ -127,13 +127,13 @@ .endm .macro RDUSP - /*move %usp,%a2*/ - .word 0x4e6a + /*move %usp,%a3*/ + .word 0x4e6b .endm .macro WRUSP - /*move %a0,%usp*/ - .word 0x4e60 + /*move %a3,%usp*/ + .word 0x4e63 .endm#endif /* !CONFIG_COLDFIRE_SW_A7 */
arch/m68k/include/asm/system.h +191 -3
196 lines not on this page · raw message
arch/m68k/include/asm/system_mm.h deleted +0 -193
193 lines not on this page · raw message
arch/m68k/include/asm/system_no.h deleted +0 -153
153 lines not on this page · raw message
arch/m68k/platform/68328/entry.S +6 -7
@@ -241,22 +241,21 @@ ENTRY(bad_interrupt) /* * Beware - when entering resume, prev (the current task) is - * in a0, next (the new task) is in a1,so don't change these + * in a0, next (the new task) is in a1, so don't change these * registers until their contents are no longer needed. */ ENTRY(resume) movel %a0,%d1 /* save prev thread in d1 */ movew %sr,%a0@(TASK_THREAD+THREAD_SR) /* save sr */ - movel %usp,%a2 /* save usp */ - movel %a2,%a0@(TASK_THREAD+THREAD_USP) - SAVE_SWITCH_STACK movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack */ + movel %usp,%a3 /* save usp */ + movel %a3,%a0@(TASK_THREAD+THREAD_USP) + + movel %a1@(TASK_THREAD+THREAD_USP),%a3 /* restore user stack */ + movel %a3,%usp movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new thread stack */ RESTORE_SWITCH_STACK - - movel %a1@(TASK_THREAD+THREAD_USP),%a0 /* restore user stack */ - movel %a0,%usp movew %a1@(TASK_THREAD+THREAD_SR),%sr /* restore thread status reg */ rts
arch/m68k/platform/68360/entry.S +6 -7
@@ -162,22 +162,21 @@ bad_interrupt: /* * Beware - when entering resume, prev (the current task) is - * in a0, next (the new task) is in a1,so don't change these + * in a0, next (the new task) is in a1, so don't change these * registers until their contents are no longer needed. */ ENTRY(resume) movel %a0,%d1 /* save prev thread in d1 */ movew %sr,%a0@(TASK_THREAD+THREAD_SR) /* save sr */ - movel %usp,%a2 /* save usp */ - movel %a2,%a0@(TASK_THREAD+THREAD_USP) - SAVE_SWITCH_STACK movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack */ + movel %usp,%a3 /* save usp */ + movel %a3,%a0@(TASK_THREAD+THREAD_USP) + + movel %a1@(TASK_THREAD+THREAD_USP),%a3 /* restore user stack */ + movel %a3,%usp movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new thread stack */ RESTORE_SWITCH_STACK - - movel %a1@(TASK_THREAD+THREAD_USP),%a0 /* restore user stack */ - movel %a0,%usp movew %a1@(TASK_THREAD+THREAD_SR),%sr /* restore thread status reg */ rts
arch/m68k/platform/coldfire/entry.S +13 -11
@@ -182,21 +182,23 @@ ENTRY(inthandler) /* * Beware - when entering resume, prev (the current task) is - * in a0, next (the new task) is in a1,so don't change these + * in a0, next (the new task) is in a1, so don't change these * registers until their contents are no longer needed. - * This is always called in supervisor mode, so don't bother to save - * and restore sr; user's process sr is actually in the stack. */ ENTRY(resume) - movel %a0, %d1 /* get prev thread in d1 */ - RDUSP - movel %a2,%a0@(TASK_THREAD+THREAD_USP) - + movew %sr,%d1 /* save current status */ + movew %d1,%a0@(TASK_THREAD+THREAD_SR) + movel %a0,%d1 /* get prev thread in d1 */ SAVE_SWITCH_STACK movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack pointer */ - movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new thread stack */ + RDUSP /* movel %usp,%a3 */ + movel %a3,%a0@(TASK_THREAD+THREAD_USP) /* save thread user stack */ + + movel %a1@(TASK_THREAD+THREAD_USP),%a3 /* restore thread user stack */ + WRUSP /* movel %a3,%usp */ + movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new kernel stack */ + movew %a1@(TASK_THREAD+THREAD_SR),%d7 /* restore new status */ + movew %d7,%sr RESTORE_SWITCH_STACK - - movel %a1@(TASK_THREAD+THREAD_USP),%a0 /* restore thread user stack */ - WRUSP rts +
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1.7.0.4