Changeset e029467 in rtems for c/src/lib/libcpu/i386/registers.h

Timestamp:

Feb 18, 1999, 3:16:37 PM (22 years ago)

Author:

Joel Sherrill <joel.sherrill@…>

Branches:

4.10, 4.11, 4.8, 4.9, 5, master

Children:

df0ac0b

Parents:

edfb0eb

Message:

Patch from Emmanuel Raguet <raguet@…>:

You will find enclosed a patch which contains, for Intel PC386 target :

• an Ethernet driver for DEC21140 device based boards.
• a simple cache management with paging mechanism.

File:

• c/src/lib/libcpu/i386/registers.h (modified) (2 diffs)

c/src/lib/libcpu/i386/registers.h

@@ -58 +58 @@
 #define CR0_PAGE_LEVEL_CACHE_DISABLE    0x40000000
 #define CR0_PAGING                      0x80000000
+
+/*
+ * definitions related to CR3
+ */
+
+#define CR3_PAGE_CACHE_DISABLE          0x10
+#define CR3_PAGE_WRITE_THROUGH          0x8
+
 
 #ifndef ASM
@@ -154 +162 @@
 }cr0;
 
+/*
+ * definition of cr3 registers has a bit field structure
+ */
+typedef struct {
+
+  unsigned int                          : 3;
+  unsigned int page_write_transparent   : 1;
+  unsigned int page_cache_disable       : 1;
+  unsigned int                          : 7;
+  unsigned int page_directory_base      :20;
+}cr3_bits;
+
+typedef union {
+  cr3_bits      cr3;
+  unsigned int  i;
+}cr3;
+
 #endif