[src/trunk]: src/sys/arch/powerpc/oea Split pmap_bootstrap() into 2 functions:

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/b7f513efb52c
branches:  trunk
changeset: 959921:b7f513efb52c
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Mon Mar 01 01:53:46 2021 +0000

description:
Split pmap_bootstrap() into 2 functions:
- pmap_bootstrap1(), which sets up the low-level pmap data structures.
- pmap_bootstrap2(), which actually programs the MMU hardware based on
  pmap_bootstrap1()'s work.

pmap_bootstrap() is still provided as a wrapper around the two, but this
provides flexibility to platforms that might need to do additional work
between these two phases.

diffstat:

 sys/arch/powerpc/include/oea/pmap.h |   4 +-
 sys/arch/powerpc/oea/pmap.c         |  71 +++++++++++++++++++++++++-----------
 2 files changed, 51 insertions(+), 24 deletions(-)

diffs (145 lines):

diff -r ffec49074a97 -r b7f513efb52c sys/arch/powerpc/include/oea/pmap.h
--- a/sys/arch/powerpc/include/oea/pmap.h       Mon Mar 01 01:43:15 2021 +0000
+++ b/sys/arch/powerpc/include/oea/pmap.h       Mon Mar 01 01:53:46 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.h,v 1.32 2020/07/06 10:57:03 rin Exp $    */
+/*     $NetBSD: pmap.h,v 1.33 2021/03/01 01:53:46 thorpej Exp $        */
 
 /*-
  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
@@ -145,6 +145,8 @@
 extern unsigned int pmap_pteg_mask;
 
 void pmap_bootstrap(vaddr_t, vaddr_t);
+void pmap_bootstrap1(vaddr_t, vaddr_t);
+void pmap_bootstrap2(void);
 bool pmap_extract(pmap_t, vaddr_t, paddr_t *);
 bool pmap_query_bit(struct vm_page *, int);
 bool pmap_clear_bit(struct vm_page *, int);
diff -r ffec49074a97 -r b7f513efb52c sys/arch/powerpc/oea/pmap.c
--- a/sys/arch/powerpc/oea/pmap.c       Mon Mar 01 01:43:15 2021 +0000
+++ b/sys/arch/powerpc/oea/pmap.c       Mon Mar 01 01:53:46 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.c,v 1.98 2020/07/06 09:34:17 rin Exp $    */
+/*     $NetBSD: pmap.c,v 1.99 2021/03/01 01:53:46 thorpej Exp $        */
 /*-
  * Copyright (c) 2001 The NetBSD Foundation, Inc.
  * All rights reserved.
@@ -63,7 +63,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.98 2020/07/06 09:34:17 rin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.99 2021/03/01 01:53:46 thorpej Exp $");
 
 #define        PMAP_NOOPNAMES
 
@@ -3145,12 +3145,11 @@
 #endif /* PMAP_OEA64_BRIDGE */
 
 /*
- * This is not part of the defined PMAP interface and is specific to the
- * PowerPC architecture.  This is called during initppc, before the system
- * is really initialized.
+ * Set up the bottom level of the data structures necessary for the kernel
+ * to manage memory.  MMU hardware is programmed in pmap_bootstrap2().
  */
 void
-pmap_bootstrap(paddr_t kernelstart, paddr_t kernelend)
+pmap_bootstrap1(paddr_t kernelstart, paddr_t kernelend)
 {
        struct mem_region *mp, tmp;
        paddr_t s, e;
@@ -3413,34 +3412,20 @@
                    continue;
 #endif
                pmap_kernel()->pm_sr[i] = KERNELN_SEGMENT(i)|SR_PRKEY;
-               __asm volatile ("mtsrin %0,%1"
-                             :: "r"(KERNELN_SEGMENT(i)|SR_PRKEY), "r"(i << ADDR_SR_SHFT));
        }
 
        pmap_kernel()->pm_sr[KERNEL_SR] = KERNEL_SEGMENT|SR_SUKEY|SR_PRKEY;
-       __asm volatile ("mtsr %0,%1"
-                     :: "n"(KERNEL_SR), "r"(KERNEL_SEGMENT));
 #ifdef KERNEL2_SR
        pmap_kernel()->pm_sr[KERNEL2_SR] = KERNEL2_SEGMENT|SR_SUKEY|SR_PRKEY;
-       __asm volatile ("mtsr %0,%1"
-                     :: "n"(KERNEL2_SR), "r"(KERNEL2_SEGMENT));
 #endif
 #endif /* PMAP_OEA || PMAP_OEA64_BRIDGE */
 #if defined (PMAP_OEA)
        for (i = 0; i < 16; i++) {
                if (iosrtable[i] & SR601_T) {
                        pmap_kernel()->pm_sr[i] = iosrtable[i];
-                       __asm volatile ("mtsrin %0,%1"
-                           :: "r"(iosrtable[i]), "r"(i << ADDR_SR_SHFT));
                }
        }
-       __asm volatile ("sync; mtsdr1 %0; isync"
-                     :: "r"((uintptr_t)pmap_pteg_table | (pmap_pteg_mask >> 10)));
-#elif defined (PMAP_OEA64) || defined (PMAP_OEA64_BRIDGE)
-       __asm __volatile ("sync; mtsdr1 %0; isync"
-                     :: "r"((uintptr_t)pmap_pteg_table | (32 - __builtin_clz(pmap_pteg_mask >> 11))));
 #endif
-       tlbia();
 
 #ifdef ALTIVEC
        pmap_use_altivec = cpu_altivec;
@@ -3537,14 +3522,54 @@
                        pmap_pte_insert(ptegidx, &pt);
                }
 #endif
-
-               __asm volatile ("mtsrin %0,%1"
-                             :: "r"(sr), "r"(kernelstart));
        }
 #endif
+}
+
+/*
+ * Using the data structures prepared in pmap_bootstrap1(), program
+ * the MMU hardware.
+ */
+void
+pmap_bootstrap2(void)
+{
+/* PMAP_OEA64_BRIDGE does support these instructions */
+#if defined (PMAP_OEA) || defined (PMAP_OEA64_BRIDGE)
+       for (int i = 0; i < 16; i++) {
+#if defined(PPC_OEA601)
+               /* XXX wedges for segment register 0xf , so set later */
+               if ((iosrtable[i] & SR601_T) && ((MFPVR() >> 16) == MPC601))
+                       continue;
+#endif /* PPC_OEA601 */
+               __asm volatile("mtsrin %0,%1"
+                       :: "r"(pmap_kernel()->pm_sr[i]),
+                          "r"(i << ADDR_SR_SHFT));
+       }
+#endif /* PMAP_OEA || PMAP_OEA64_BRIDGE */
+#if defined (PMAP_OEA)
+        __asm volatile("sync; mtsdr1 %0; isync"
+               :: "r"((uintptr_t)pmap_pteg_table | (pmap_pteg_mask >> 10)));
+#elif defined (PMAP_OEA64) || defined (PMAP_OEA64_BRIDGE)
+       __asm __volatile("sync; mtsdr1 %0; isync"
+               :: "r"((uintptr_t)pmap_pteg_table |
+                      (32 - __builtin_clz(pmap_pteg_mask >> 11))));
+#endif
+       tlbia();
 
 #if defined(PMAPDEBUG)
        if ( pmapdebug )
            pmap_print_mmuregs();
 #endif
 }
+
+/*
+ * This is not part of the defined PMAP interface and is specific to the
+ * PowerPC architecture.  This is called during initppc, before the system
+ * is really initialized.
+ */
+void
+pmap_bootstrap(paddr_t kernelstart, paddr_t kernelend)
+{
+       pmap_bootstrap1(kernelstart, kernelend);
+       pmap_bootstrap2();
+}