linux/arch/sparc/mm/srmmu_access.S
Sam Ravnborg 6729cf7967 sparc32: introduce run-time patching of srmmu access functions
LEON uses a different ASI than SUN for MMUREGS

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Daniel Hellstrom <daniel@gaisler.com>
Cc: Konrad Eisele <konrad@gaisler.com>
2012-05-27 23:52:49 -07:00

83 lines
1.9 KiB
ArmAsm

/* Assembler variants of srmmu access functions.
* Implemented in assembler to allow run-time patching.
* LEON uses a different ASI for MMUREGS than SUN.
*
* The leon_1insn_patch infrastructure is used
* for the run-time patching.
*/
#include <linux/linkage.h>
#include <asm/asmmacro.h>
#include <asm/pgtsrmmu.h>
#include <asm/asi.h>
/* unsigned int srmmu_get_mmureg(void) */
ENTRY(srmmu_get_mmureg)
LEON_PI(lda [%g0] ASI_LEON_MMUREGS, %o0)
SUN_PI_(lda [%g0] ASI_M_MMUREGS, %o0)
retl
nop
ENDPROC(srmmu_get_mmureg)
/* void srmmu_set_mmureg(unsigned long regval) */
ENTRY(srmmu_set_mmureg)
LEON_PI(sta %o0, [%g0] ASI_LEON_MMUREGS)
SUN_PI_(sta %o0, [%g0] ASI_M_MMUREGS)
retl
nop
ENDPROC(srmmu_set_mmureg)
/* void srmmu_set_ctable_ptr(unsigned long paddr) */
ENTRY(srmmu_set_ctable_ptr)
/* paddr = ((paddr >> 4) & SRMMU_CTX_PMASK); */
srl %o0, 4, %g1
and %g1, SRMMU_CTX_PMASK, %g1
mov SRMMU_CTXTBL_PTR, %g2
LEON_PI(sta %g1, [%g2] ASI_LEON_MMUREGS)
SUN_PI_(sta %g1, [%g2] ASI_M_MMUREGS)
retl
nop
ENDPROC(srmmu_set_ctable_ptr)
/* void srmmu_set_context(int context) */
ENTRY(srmmu_set_context)
mov SRMMU_CTX_REG, %g1
LEON_PI(sta %o0, [%g1] ASI_LEON_MMUREGS)
SUN_PI_(sta %o0, [%g1] ASI_M_MMUREGS)
retl
nop
ENDPROC(srmmu_set_context)
/* int srmmu_get_context(void) */
ENTRY(srmmu_get_context)
mov SRMMU_CTX_REG, %o0
LEON_PI(lda [%o0] ASI_LEON_MMUREGS, %o0)
SUN_PI_(lda [%o0] ASI_M_MMUREGS, %o0)
retl
nop
ENDPROC(srmmu_get_context)
/* unsigned int srmmu_get_fstatus(void) */
ENTRY(srmmu_get_fstatus)
mov SRMMU_FAULT_STATUS, %o0
LEON_PI(lda [%o0] ASI_LEON_MMUREGS, %o0)
SUN_PI_(lda [%o0] ASI_M_MMUREGS, %o0)
retl
nop
ENDPROC(srmmu_get_fstatus)
/* unsigned int srmmu_get_faddr(void) */
ENTRY(srmmu_get_faddr)
mov SRMMU_FAULT_ADDR, %o0
LEON_PI(lda [%o0] ASI_LEON_MMUREGS, %o0)
SUN_PI_(lda [%o0] ASI_M_MMUREGS, %o0)
retl
nop
ENDPROC(srmmu_get_faddr)