patch-2.1.126 linux/include/asm-mips/mmu_context.h

• Lines: 117
• Date: Tue Oct 20 13:52:53 1998
• Orig file: v2.1.125/linux/include/asm-mips/mmu_context.h
• Orig date: Thu Aug 6 14:06:33 1998

diff -u --recursive --new-file v2.1.125/linux/include/asm-mips/mmu_context.h linux/include/asm-mips/mmu_context.h
@@ -1,4 +1,4 @@
-/* $Id: mmu_context.h,v 1.4 1998/05/07 00:40:04 ralf Exp $
+/* $Id: mmu_context.h,v 1.3 1998/10/16 19:22:54 ralf Exp $
  *
  * Switch a MMU context.
  *
@@ -11,29 +11,61 @@
 #ifndef __ASM_MIPS_MMU_CONTEXT_H
 #define __ASM_MIPS_MMU_CONTEXT_H
 
-#define MAX_ASID 255
-
+/* Fuck.  The f-word is here so you can grep for it :-)  */
 extern unsigned long asid_cache;
 
-#define ASID_VERSION_SHIFT 16
-#define ASID_VERSION_MASK  ((~0UL) << ASID_VERSION_SHIFT)
-#define ASID_FIRST_VERSION (1UL << ASID_VERSION_SHIFT)
-
-extern inline void get_new_mmu_context(struct mm_struct *mm, unsigned long asid)
-{
-	/* check if it's legal.. */
-	if ((asid & ~ASID_VERSION_MASK) > MAX_ASID) {
-		/* start a new version, invalidate all old asid's */
-		flush_tlb_all();
-		asid = (asid & ASID_VERSION_MASK) + ASID_FIRST_VERSION;
-		if (!asid)
+/* I patch, therefore I am ...  */
+#define ASID_INC(asid)						\
+ ({ unsigned long __asid = asid;				\
+   __asm__("1:\taddiu\t%0,0\t\t\t\t# patched\n\t"		\
+           ".section\t__asid_inc,\"a\"\n\t"			\
+           ".word\t1b\n\t"					\
+           ".previous"						\
+           :"=r" (__asid)					\
+           :"0" (__asid));					\
+   __asid; })
+#define ASID_MASK(asid)						\
+ ({ unsigned long __asid = asid;				\
+   __asm__("1:\tandi\t%0,%1,0\t\t\t# patched\n\t"			\
+           ".section\t__asid_mask,\"a\"\n\t"			\
+           ".word\t1b\n\t"					\
+           ".previous"						\
+           :"=r" (__asid)					\
+           :"r" (__asid));					\
+   __asid; })
+#define ASID_VERSION_MASK					\
+ ({ unsigned long __asid;					\
+   __asm__("1:\tli\t%0,0\t\t\t\t# patched\n\t"			\
+           ".section\t__asid_version_mask,\"a\"\n\t"		\
+           ".word\t1b\n\t"					\
+           ".previous"						\
+           :"=r" (__asid));					\
+   __asid; })
+#define ASID_FIRST_VERSION					\
+ ({ unsigned long __asid = asid;				\
+   __asm__("1:\tli\t%0,0\t\t\t\t# patched\n\t"			\
+           ".section\t__asid_first_version,\"a\"\n\t"		\
+           ".word\t1b\n\t"					\
+           ".previous"						\
+           :"=r" (__asid));					\
+   __asid; })
+
+#define ASID_FIRST_VERSION_R3000 0x1000
+#define ASID_FIRST_VERSION_R4000 0x100
+
+extern inline void
+get_new_mmu_context(struct mm_struct *mm, unsigned long asid)
+{
+	if (!ASID_MASK((asid = ASID_INC(asid)))) {
+		flush_tlb_all(); /* start new asid cycle */
+		if (!asid)      /* fix version if needed */
 			asid = ASID_FIRST_VERSION;
 	}
-	asid_cache = asid + 1;
-	mm->context = asid;			 /* full version + asid */
+	mm->context = asid_cache = asid;
 }
 
-extern inline void get_mmu_context(struct task_struct *p)
+extern inline void
+get_mmu_context(struct task_struct *p)
 {
 	struct mm_struct *mm = p->mm;
 
@@ -72,5 +104,31 @@
 	get_mmu_context(tsk);
 	set_entryhi(tsk->mm->context);
 }
+
+extern void __asid_setup(unsigned int inc, unsigned int mask,
+                         unsigned int version_mask, unsigned int first_version);
+
+extern inline void r3000_asid_setup(void)
+{
+	__asid_setup(0x40, 0xfc0, 0xf000, ASID_FIRST_VERSION_R3000);
+}
+
+extern inline void r6000_asid_setup(void)
+{
+	panic("r6000_asid_setup: implement me");	/* No idea ...  */
+}
+
+extern inline void tfp_asid_setup(void)
+{
+	panic("tfp_asid_setup: implement me");	/* No idea ...  */
+}
+
+extern inline void r4xx0_asid_setup(void)
+{
+	__asid_setup(1, 0xff, 0xff00, ASID_FIRST_VERSION_R4000);
+}
+
+/* R10000 has the same ASID mechanism as the R4000.  */
+#define andes_asid_setup r4xx0_asid_setup
 
 #endif /* __ASM_MIPS_MMU_CONTEXT_H */