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>

3 files changed, 90 insertions, 61 deletions

diff --git a/arch/sparc/include/asm/pgtsrmmu.h b/arch/sparc/include/asm/pgtsrmmu.h
index 394fe25e79d1..72f71214ef87 100644
--- a/arch/sparc/include/asm/pgtsrmmu.h
+++ b/arch/sparc/include/asm/pgtsrmmu.h
@@ -149,67 +149,13 @@ extern void *srmmu_nocache_pool;
 #define __nocache_fix(VADDR) __va(__nocache_pa(VADDR))
 
 /* Accessing the MMU control register. */
-static inline unsigned int srmmu_get_mmureg(void)
-{
-        unsigned int retval;
-        __asm__ __volatile__("lda [%%g0] %1, %0\n\t" :
-                             "=r" (retval) :
-                             "i" (ASI_M_MMUREGS));
-        return retval;
-}
-
-static inline void srmmu_set_mmureg(unsigned long regval)
-{
-        __asm__ __volatile__("sta %0, [%%g0] %1\n\t" : :
-                             "r" (regval), "i" (ASI_M_MMUREGS) : "memory");
-
-}
-
-static inline void srmmu_set_ctable_ptr(unsigned long paddr)
-{
-        paddr = ((paddr >> 4) & SRMMU_CTX_PMASK);
-        __asm__ __volatile__("sta %0, [%1] %2\n\t" : :
-                             "r" (paddr), "r" (SRMMU_CTXTBL_PTR),
-                             "i" (ASI_M_MMUREGS) :
-                             "memory");
-}
-
-static inline void srmmu_set_context(int context)
-{
-        __asm__ __volatile__("sta %0, [%1] %2\n\t" : :
-                             "r" (context), "r" (SRMMU_CTX_REG),
-                             "i" (ASI_M_MMUREGS) : "memory");
-}
-
-static inline int srmmu_get_context(void)
-{
-        register int retval;
-        __asm__ __volatile__("lda [%1] %2, %0\n\t" :
-                             "=r" (retval) :
-                             "r" (SRMMU_CTX_REG),
-                             "i" (ASI_M_MMUREGS));
-        return retval;
-}
-
-static inline unsigned int srmmu_get_fstatus(void)
-{
-        unsigned int retval;
-
-        __asm__ __volatile__("lda [%1] %2, %0\n\t" :
-                             "=r" (retval) :
-                             "r" (SRMMU_FAULT_STATUS), "i" (ASI_M_MMUREGS));
-        return retval;
-}
-
-static inline unsigned int srmmu_get_faddr(void)
-{
-        unsigned int retval;
-
-        __asm__ __volatile__("lda [%1] %2, %0\n\t" :
-                             "=r" (retval) :
-                             "r" (SRMMU_FAULT_ADDR), "i" (ASI_M_MMUREGS));
-        return retval;
-}
+unsigned int srmmu_get_mmureg(void);
+void srmmu_set_mmureg(unsigned long regval);
+void srmmu_set_ctable_ptr(unsigned long paddr);
+void srmmu_set_context(int context);
+int srmmu_get_context(void);
+unsigned int srmmu_get_fstatus(void);
+unsigned int srmmu_get_faddr(void);
 
 /* This is guaranteed on all SRMMU's. */
 static inline void srmmu_flush_whole_tlb(void)
diff --git a/arch/sparc/mm/Makefile b/arch/sparc/mm/Makefile
index 389aebd720bc..30c3eccfdf5a 100644
--- a/arch/sparc/mm/Makefile
+++ b/arch/sparc/mm/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_SPARC64)   += ultra.o tlb.o tsb.o gup.o
 obj-y                   += fault_$(BITS).o
 obj-y                   += init_$(BITS).o
 obj-$(CONFIG_SPARC32)   += extable.o srmmu.o iommu.o io-unit.o
+obj-$(CONFIG_SPARC32)   += srmmu_access.o
 obj-$(CONFIG_SPARC32)   += hypersparc.o viking.o tsunami.o swift.o
 obj-$(CONFIG_SPARC32)   += leon_mm.o
 
diff --git a/arch/sparc/mm/srmmu_access.S b/arch/sparc/mm/srmmu_access.S
new file mode 100644
index 000000000000..d0a67b2c2383
--- /dev/null
+++ b/arch/sparc/mm/srmmu_access.S
@@ -0,0 +1,82 @@
+/* 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)