feat: add support for process to conduct Intel x87 and MMX related task.

[lunaix-os.git] / lunaix-os / arch / x86 / boot.S

diff --git a/lunaix-os/arch/x86/boot.S b/lunaix-os/arch/x86/boot.S
index 9c86bbc6bed8081695dcb00a58b33b100403b73e..938db876514333b8a8f0dec1b1d598590b51f80d 100644 (file)
--- a/lunaix-os/arch/x86/boot.S
+++ b/lunaix-os/arch/x86/boot.S
@@ -77,11 +77,17 @@
         andl $0xfffff000, %eax      # 有点多余，但写上还算明白一点
         movl %eax, %cr3
 
-        /* 开启分页与地址转换 (CR0.PG=1, PG.WP=1) */
         movl %cr0, %eax
-        orl $0x80010000, %eax
+        orl $0x80010000, %eax   /* 开启分页与地址转换 (CR0.PG=1, CR0.WP=1) */
+        andl $0xfffffffb, %eax
+        orl $0x2, %eax          /* 启用x87 FPU (CR0.MP=1, CR0.EM=0) */
         movl %eax, %cr0
 
+        movl %cr4, %eax
+        orl $0x600, %eax
+        movl %eax, %cr4         /* CR4.OSFXSR=1, CR4.OSXMMEXCPT=1 */
+                                /* x87 FPU 已配置 */
+
         addl $16, %esp
 
         /* 进入高半核！ */