Architectural Support: x86_64 (#37)

[lunaix-os.git] / lunaix-os / arch / x86 / includes / sys / crx.h

diff --git a/lunaix-os/arch/x86/includes/sys/crx.h b/lunaix-os/arch/x86/includes/sys/crx.h
new file mode 100644 (file)
index 0000000..4eb56e0
--- /dev/null
+++ b/lunaix-os/arch/x86/includes/sys/crx.h
@@ -0,0 +1,76 @@
+#ifndef __LUNAIX_CRX_H
+#define __LUNAIX_CRX_H
+
+#define CR4_PSE36           ( 1UL << 4  )
+#define CR4_OSXMMEXCPT      ( 1UL << 10 )
+#define CR4_OSFXSR          ( 1UL << 9  )
+#define CR4_PCIDE           ( 1UL << 17 )
+#define CR4_PGE             ( 1UL << 7  )
+#define CR4_LA57            ( 1UL << 12 )
+
+#define CR0_PG              ( 1UL << 31 )
+#define CR0_WP              ( 1UL << 16 )
+#define CR0_EM              ( 1UL << 2  )
+#define CR0_MP              ( 1UL << 1  )
+
+#ifdef CONFIG_ARCH_X86_64
+
+#define crx_addflag(crx, flag)      \
+    asm(                            \
+        "movq %%" #crx ", %%rax\n"  \
+        "orq  %0,    %%rax\n"       \
+        "movq %%rax, %%" #crx "\n"  \
+        ::"r"(flag)                 \
+        :"rax"                      \
+    );
+
+#define crx_rmflag(crx, flag)       \
+    asm(                            \
+        "movq %%" #crx ", %%rax\n"  \
+        "andq  %0,    %%rax\n"      \
+        "movq %%rax, %%" #crx "\n"  \
+        ::"r"(~(flag))              \
+        :"rax"                      \
+    );
+
+#else
+
+#define crx_addflag(crx, flag)      \
+    asm(                            \
+        "movl %%" #crx ", %%eax\n"  \
+        "orl  %0,    %%eax\n"       \
+        "movl %%eax, %%" #crx "\n"  \
+        ::"r"(flag)                 \
+        :"eax"                      \
+    );
+
+#define crx_rmflag(crx, flag)       \
+    asm(                            \
+        "movl %%" #crx ", %%eax\n"  \
+        "andl  %0,    %%eax\n"      \
+        "movl %%eax, %%" #crx "\n"  \
+        ::"r"(~(flag))              \
+        :"eax"                      \
+    );
+
+#endif
+
+static inline void
+cr4_setfeature(unsigned long feature)
+{
+    crx_addflag(cr4, feature);
+}
+
+static inline void
+cr0_setfeature(unsigned long feature)
+{
+    crx_addflag(cr0, feature);
+}
+
+static inline void
+cr0_unsetfeature(unsigned long feature)
+{
+    crx_rmflag(cr0, feature);
+}
+
+#endif /* __LUNAIX_CR4_H */