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m68knommu: use user stack pointer hardware on some ColdFire cores 

The more modern ColdFire parts (even if based on older version cores)
have separate user and supervisor stack pointers (a7 register).
Modify the ColdFire CPU setup and exception code to enable and use
this on parts that have it.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
Greg Ungerer 2010-11-04 13:53:26 +10:00
parent 0762346034
commit 1c83af5f9d
7 changed files with 72 additions and 55 deletions
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4
arch/m68k/include/asm/cacheflush_no.h
View File

@ -37,7 +37,7 @@ static inline void __flush_cache_all(void)
{
#if defined(CONFIG_M523x) || defined(CONFIG_M527x)
__asm__ __volatile__ (
"movel #0x81400100, %%d0\n\t"
"movel #0x81400110, %%d0\n\t"
"movec %%d0, %%CACR\n\t"
"nop\n\t"
: : : "d0" );
@ -65,7 +65,7 @@ static inline void __flush_cache_all(void)
#endif /* CONFIG_M5249 */
#ifdef CONFIG_M532x
__asm__ __volatile__ (
"movel #0x81000200, %%d0\n\t"
"movel #0x81000210, %%d0\n\t"
"movec %%d0, %%CACR\n\t"
"nop\n\t"
: : : "d0" );

59
arch/m68k/include/asm/entry_no.h
View File

@ -42,12 +42,16 @@
*/
#ifdef CONFIG_COLDFIRE
#ifdef CONFIG_COLDFIRE_SW_A7
/*
* This is made a little more tricky on the ColdFire. There is no
* separate kernel and user stack pointers. Need to artificially
* This is made a little more tricky on older ColdFires. There is no
* separate supervisor and user stack pointers. Need to artificially
* construct a usp in software... When doing this we need to disable
* interrupts, otherwise bad things could happen.
* interrupts, otherwise bad things will happen.
*/
.globl sw_usp
.globl sw_ksp
.macro SAVE_ALL
move #0x2700,%sr /* disable intrs */
btst #5,%sp@(2) /* from user? */
@ -74,9 +78,7 @@
7:
.endm
.macro RESTORE_ALL
btst #5,%sp@(PT_SR) /* going user? */
bnes 8f /* no, skip */
.macro RESTORE_USER
move #0x2700,%sr /* disable intrs */
movel sw_usp,%a0 /* get usp */
movel %sp@(PT_OFF_PC),%a0@- /* copy exception program counter */
@ -91,19 +93,22 @@
subql #8,sw_usp /* set exception */
movel sw_usp,%sp /* restore usp */
rte
8:
moveml %sp@,%d1-%d5/%a0-%a2
lea %sp@(32),%sp /* space for 8 regs */
movel %sp@+,%d0
addql #4,%sp /* orig d0 */
addl %sp@+,%sp /* stkadj */
rte
.endm
.macro RDUSP
movel sw_usp,%a2
.endm
.macro WRUSP
movel %a0,sw_usp
.endm
#else /* !CONFIG_COLDFIRE_SW_A7 */
/*
* Quick exception save, use current stack only.
* Modern ColdFire parts have separate supervisor and user stack
* pointers. Simple load and restore macros for this case.
*/
.macro SAVE_LOCAL
.macro SAVE_ALL
move #0x2700,%sr /* disable intrs */
clrl %sp@- /* stkadj */
movel %d0,%sp@- /* orig d0 */
@ -112,7 +117,7 @@
moveml %d1-%d5/%a0-%a2,%sp@
.endm
.macro RESTORE_LOCAL
.macro RESTORE_USER
moveml %sp@,%d1-%d5/%a0-%a2
lea %sp@(32),%sp /* space for 8 regs */
movel %sp@+,%d0
@ -121,6 +126,18 @@
rte
.endm
.macro RDUSP
/*move %usp,%a2*/
.word 0x4e6a
.endm
.macro WRUSP
/*move %a0,%usp*/
.word 0x4e60
.endm
#endif /* !CONFIG_COLDFIRE_SW_A7 */
.macro SAVE_SWITCH_STACK
lea %sp@(-24),%sp /* 6 regs */
moveml %a3-%a6/%d6-%d7,%sp@
@ -131,14 +148,6 @@
lea %sp@(24),%sp /* 6 regs */
.endm
/*
* Software copy of the user and kernel stack pointers... Ugh...
* Need these to get around ColdFire not having separate kernel
* and user stack pointers.
*/
.globl sw_usp
.globl sw_ksp
#else /* !CONFIG_COLDFIRE */
/*
@ -167,6 +176,6 @@
moveml %sp@+,%a3-%a6/%d6-%d7
.endm
#endif /* !CONFIG_COLDFIRE */
#endif /* !COLDFIRE_SW_A7 */
#endif /* __ASSEMBLY__ */
#endif /* __M68KNOMMU_ENTRY_H */

5
arch/m68k/include/asm/m54xxacr.h
View File

@ -26,6 +26,7 @@
#define CACR_IHLCK 0x00000800 /* Intruction cache half lock */
#define CACR_IDCM 0x00000400 /* Intruction cache inhibit */
#define CACR_ICINVA 0x00000100 /* Invalidate instr cache */
#define CACR_EUSP 0x00000020 /* Enable separate user a7 */
#define ACR_BASE_POS 24 /* Address Base */
#define ACR_MASK_POS 16 /* Address Mask */
@ -67,7 +68,11 @@
/* Enable data store buffer */
/* outside ACRs : No cache, precise */
/* Enable instruction+branch caches */
#if defined(CONFIG_M5407)
#define CACHE_MODE (CACR_DEC+CACR_DESB+CACR_DDCM_P+CACR_BEC+CACR_IEC)
#else
#define CACHE_MODE (CACR_DEC+CACR_DESB+CACR_DDCM_P+CACR_BEC+CACR_IEC+CACR_EUSP)
#endif
#define DATA_CACHE_MODE (ACR_ENABLE+ACR_ANY+ACR_CM_WT)

6
arch/m68k/include/asm/mcfcache.h
View File

@ -46,7 +46,7 @@
movec %d0,%ACR0
movel #0x00000000,%d0 /* no other regions cached */
movec %d0,%ACR1
movel #0x80400100,%d0 /* configure cache */
movel #0x80400110,%d0 /* configure cache */
movec %d0,%CACR /* enable cache */
nop
.endm
@ -101,7 +101,7 @@
movec %d0,%ACR0
movel #0x00000000,%d0 /* no other regions cached */
movec %d0,%ACR1
movel #0x80000200,%d0 /* setup cache mask */
movel #0x80000210,%d0 /* setup cache mask */
movec %d0,%CACR /* enable cache */
nop
.endm
@ -142,7 +142,7 @@
movec %d0,%ACR0
move.l #0x00000000,%d0 /* no other regions cached */
movec %d0,%ACR1
move.l #0x80400000,%d0 /* enable 8K instruction cache */
move.l #0x80400010,%d0 /* enable 8K instruction cache */
movec %d0,%CACR
nop
.endm

13
arch/m68k/include/asm/processor.h
View File

@ -20,23 +20,26 @@
static inline unsigned long rdusp(void)
{
#ifdef CONFIG_COLDFIRE
#ifdef CONFIG_COLDFIRE_SW_A7
extern unsigned int sw_usp;
return sw_usp;
#else
unsigned long usp;
__asm__ __volatile__("move %/usp,%0" : "=a" (usp));
register unsigned long usp __asm__("a0");
/* move %usp,%a0 */
__asm__ __volatile__(".word 0x4e68" : "=a" (usp));
return usp;
#endif
}
static inline void wrusp(unsigned long usp)
{
#ifdef CONFIG_COLDFIRE
#ifdef CONFIG_COLDFIRE_SW_A7
extern unsigned int sw_usp;
sw_usp = usp;
#else
__asm__ __volatile__("move %0,%/usp" : : "a" (usp));
register unsigned long a0 __asm__("a0") = usp;
/* move %a0,%usp */
__asm__ __volatile__(".word 0x4e60" : : "a" (a0) );
#endif
}

10
arch/m68knommu/Kconfig
View File

@ -75,6 +75,10 @@ config GENERIC_CLOCKEVENTS
config NO_IOPORT
def_bool y
config COLDFIRE_SW_A7
bool
default n
source "init/Kconfig"
source "kernel/Kconfig.freezer"
@ -107,11 +111,13 @@ config M68360
config M5206
bool "MCF5206"
select COLDFIRE_SW_A7
help
Motorola ColdFire 5206 processor support.
config M5206e
bool "MCF5206e"
select COLDFIRE_SW_A7
help
Motorola ColdFire 5206e processor support.
@ -129,6 +135,7 @@ config M523x
config M5249
bool "MCF5249"
select COLDFIRE_SW_A7
help
Motorola ColdFire 5249 processor support.
@ -139,6 +146,7 @@ config M5271
config M5272
bool "MCF5272"
select COLDFIRE_SW_A7
help
Motorola ColdFire 5272 processor support.
@ -155,6 +163,7 @@ config M528x
config M5307
bool "MCF5307"
select COLDFIRE_SW_A7
help
Motorola ColdFire 5307 processor support.
@ -165,6 +174,7 @@ config M532x
config M5407
bool "MCF5407"
select COLDFIRE_SW_A7
help
Motorola ColdFire 5407 processor support.

30
arch/m68knommu/platform/coldfire/entry.S
View File

@ -36,13 +36,16 @@
#include <asm/asm-offsets.h>
#include <asm/entry.h>
#ifdef CONFIG_COLDFIRE_SW_A7
/*
* Define software copies of the supervisor and user stack pointers.
*/
.bss
sw_ksp:
.long 0
sw_usp:
.long 0
#endif /* CONFIG_COLDFIRE_SW_A7 */
.text
@ -52,6 +55,7 @@ sw_usp:
.globl ret_from_signal
.globl sys_call_table
.globl inthandler
.globl fasthandler
enosys:
mov.l #sys_ni_syscall,%d3
@ -138,20 +142,7 @@ Luser_return:
jne Lwork_to_do /* still work to do */
Lreturn:
move #0x2700,%sr /* disable intrs */
movel sw_usp,%a0 /* get usp */
movel %sp@(PT_OFF_PC),%a0@- /* copy exception program counter */
movel %sp@(PT_OFF_FORMATVEC),%a0@- /* copy exception format/vector/sr */
moveml %sp@,%d1-%d5/%a0-%a2
lea %sp@(32),%sp /* space for 8 regs */
movel %sp@+,%d0
addql #4,%sp /* orig d0 */
addl %sp@+,%sp /* stk adj */
addql #8,%sp /* remove exception */
movel %sp,sw_ksp /* save ksp */
subql #8,sw_usp /* set exception */
movel sw_usp,%sp /* restore usp */
rte
RESTORE_USER
Lwork_to_do:
movel %a0@(TI_FLAGS),%d1 /* get thread_info->flags */
@ -201,9 +192,8 @@ ENTRY(inthandler)
*/
ENTRY(resume)
movel %a0, %d1 /* get prev thread in d1 */
movel sw_usp,%d0 /* save usp */
movel %d0,%a0@(TASK_THREAD+THREAD_USP)
RDUSP
movel %a2,%a0@(TASK_THREAD+THREAD_USP)
SAVE_SWITCH_STACK
movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack pointer */
@ -211,5 +201,5 @@ ENTRY(resume)
RESTORE_SWITCH_STACK
movel %a1@(TASK_THREAD+THREAD_USP),%a0 /* restore thread user stack */
movel %a0, sw_usp
WRUSP
rts