Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / sparc / include / asm / switch_to_64.h

diff --git a/kernel/arch/sparc/include/asm/switch_to_64.h b/kernel/arch/sparc/include/asm/switch_to_64.h
new file mode 100644 (file)
index 0000000..10e7633
--- /dev/null
+++ b/kernel/arch/sparc/include/asm/switch_to_64.h
@@ -0,0 +1,71 @@
+#ifndef __SPARC64_SWITCH_TO_64_H
+#define __SPARC64_SWITCH_TO_64_H
+
+#include <asm/visasm.h>
+
+#define prepare_arch_switch(next)              \
+do {                                           \
+       flushw_all();                           \
+} while (0)
+
+       /* See what happens when you design the chip correctly?
+        *
+        * We tell gcc we clobber all non-fixed-usage registers except
+        * for l0/l1.  It will use one for 'next' and the other to hold
+        * the output value of 'last'.  'next' is not referenced again
+        * past the invocation of switch_to in the scheduler, so we need
+        * not preserve it's value.  Hairy, but it lets us remove 2 loads
+        * and 2 stores in this critical code path.  -DaveM
+        */
+#define switch_to(prev, next, last)                                    \
+do {   save_and_clear_fpu();                                           \
+       /* If you are tempted to conditionalize the following */        \
+       /* so that ASI is only written if it changes, think again. */   \
+       __asm__ __volatile__("wr %%g0, %0, %%asi"                       \
+       : : "r" (task_thread_info(next)->current_ds));\
+       trap_block[current_thread_info()->cpu].thread =                 \
+               task_thread_info(next);                                 \
+       __asm__ __volatile__(                                           \
+       "mov    %%g4, %%g7\n\t"                                         \
+       "stx    %%i6, [%%sp + 2047 + 0x70]\n\t"                         \
+       "stx    %%i7, [%%sp + 2047 + 0x78]\n\t"                         \
+       "rdpr   %%wstate, %%o5\n\t"                                     \
+       "stx    %%o6, [%%g6 + %6]\n\t"                                  \
+       "stb    %%o5, [%%g6 + %5]\n\t"                                  \
+       "rdpr   %%cwp, %%o5\n\t"                                        \
+       "stb    %%o5, [%%g6 + %8]\n\t"                                  \
+       "wrpr   %%g0, 15, %%pil\n\t"                                    \
+       "mov    %4, %%g6\n\t"                                           \
+       "ldub   [%4 + %8], %%g1\n\t"                                    \
+       "wrpr   %%g1, %%cwp\n\t"                                        \
+       "ldx    [%%g6 + %6], %%o6\n\t"                                  \
+       "ldub   [%%g6 + %5], %%o5\n\t"                                  \
+       "ldub   [%%g6 + %7], %%o7\n\t"                                  \
+       "wrpr   %%o5, 0x0, %%wstate\n\t"                                \
+       "ldx    [%%sp + 2047 + 0x70], %%i6\n\t"                         \
+       "ldx    [%%sp + 2047 + 0x78], %%i7\n\t"                         \
+       "ldx    [%%g6 + %9], %%g4\n\t"                                  \
+       "wrpr   %%g0, 14, %%pil\n\t"                                    \
+       "brz,pt %%o7, switch_to_pc\n\t"                                 \
+       " mov   %%g7, %0\n\t"                                           \
+       "sethi  %%hi(ret_from_fork), %%g1\n\t"                          \
+       "jmpl   %%g1 + %%lo(ret_from_fork), %%g0\n\t"                   \
+       " nop\n\t"                                                      \
+       ".globl switch_to_pc\n\t"                                       \
+       "switch_to_pc:\n\t"                                             \
+       : "=&r" (last), "=r" (current), "=r" (current_thread_info_reg), \
+         "=r" (__local_per_cpu_offset)                                 \
+       : "0" (task_thread_info(next)),                                 \
+         "i" (TI_WSTATE), "i" (TI_KSP), "i" (TI_NEW_CHILD),            \
+         "i" (TI_CWP), "i" (TI_TASK)                                   \
+       : "cc",                                                         \
+               "g1", "g2", "g3",                   "g7",               \
+               "l1", "l2", "l3", "l4", "l5", "l6", "l7",               \
+         "i0", "i1", "i2", "i3", "i4", "i5",                           \
+         "o0", "o1", "o2", "o3", "o4", "o5",       "o7");              \
+} while(0)
+
+void synchronize_user_stack(void);
+void fault_in_user_windows(void);
+
+#endif /* __SPARC64_SWITCH_TO_64_H */