xtensa/kernel/coprocessor.S

2  * arch/xtensa/kernel/coprocessor.S
4  * Xtensa processor configuration-specific table of coprocessor and
18 #include <asm/coprocessor.h>
23  * Rules for coprocessor state manipulation on SMP:
27  * - whether coprocessor context of task T is live on some CPU is
32  *   coprocessor context is valid in the T's thread_info.
34  * - if a coprocessor context of task T is live on CPU X, only CPU X changes
35  *   T's thread_info->cpenable, cp_owner_cpu and coprocessor save area.
36  *   This is done by making sure that for the task T with live coprocessor
128 	 * Check if any coprocessor context is live on another CPU
129 	 * and if so go through the C-level coprocessor exception handler
172 	/* Find coprocessor number. Subtract first CP EXCCAUSE from EXCCAUSE */
187 	/* Get coprocessor save/load table entry (a7). */
207 	 * Enable coprocessor for the new owner. (a2 = 1 << CP number)
208 	 * This can be done before loading context into the coprocessor.
222 	/* Disable coprocessor for previous owner. (a2 = 1 << CP number) */
235 	 * Make sure coprocessor context and THREAD_CP_OWNER_CPU are in memory
275  * Save coprocessor registers for coprocessor 'index'.
276  * The register values are saved to or loaded from the coprocessor area