Changeset 3526f4f3 in mainline

Timestamp:

2024-05-21T13:42:25Z (6 weeks ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

master

Children:

b6f8f69

Parents:

443695e

git-author:

Jiri Svoboda <jiri@…> (2024-05-20 18:42:12)

git-committer:

Jiri Svoboda <jiri@…> (2024-05-21 13:42:25)

Message:

On 486 we cannot call read_msr()/write_msr()

Location:

kernel/arch

Files:

• amd64/include/arch/mm/pat.h (modified) (3 diffs)
• ia32/src/ia32.c (modified) (2 diffs)

kernel/arch/amd64/include/arch/mm/pat.h

@@ -1 +1 @@
 /*
+ * Copyright (c) 2024 Jiri Svoboda
  * Copyright (c) 2024 Jiří Zárevúcky
  * All rights reserved.
@@ -50 +51 @@
 } pat_type_t;
 
+#ifndef PROCESSOR_i486
 /**
  * Assign caching type for a particular combination of PAT,
@@ -65 +67 @@
         write_msr(MSR_IA32_PAT, r);
 }
+#endif
 
 static inline bool pat_supported(void)

kernel/arch/ia32/src/ia32.c

@@ -1 +1 @@
 /*
+ * Copyright (c) 2024 Jiri Svoboda
  * Copyright (c) 2001-2004 Jakub Jermar
- * Copyright (c) 2009 Jiri Svoboda
  * Copyright (c) 2009 Martin Decky
  * All rights reserved.
@@ -106 +106 @@
         pm_init();
 
+#ifndef PROCESSOR_i486
         /* Use PCD+PWT bit combination in PTE to mean write-combining mode. */
         if (pat_supported())
                 pat_set_mapping(false, true, true, PAT_TYPE_WRITE_COMBINING);
+#endif
 
         if (config.cpu_active == 1) {