Chris Wright wrote:
+#define read_cr4_safe() ({ \
+ unsigned int __dummy; \
+ /* This could fault if %cr4 does not exist */ \
+ __asm__("1: movl %%cr4, %0 \n" \
+ "2: \n" \
+ ".section __ex_table,\"a\" \n" \
+ ".long 1b,2b \n" \
+ ".previous \n" \
+ : "=r" (__dummy): "0" (0)); \
+ __dummy; \
+})
I think you'll find trap and emulate quite sufficient for this one.
+#define stts() write_cr0(8 | read_cr0())
Nit: You shouldn't need to redefine stts() in the subarch.
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