| David Howells | d550bbd | 2012-03-28 18:30:03 +0100 | [diff] [blame] | 1 | #ifndef __SPARC64_SWITCH_TO_64_H |
| 2 | #define __SPARC64_SWITCH_TO_64_H |
| 3 | |
| 4 | #include <asm/visasm.h> |
| 5 | |
| 6 | #define prepare_arch_switch(next) \ |
| 7 | do { \ |
| 8 | flushw_all(); \ |
| 9 | } while (0) |
| 10 | |
| 11 | /* See what happens when you design the chip correctly? |
| 12 | * |
| 13 | * We tell gcc we clobber all non-fixed-usage registers except |
| 14 | * for l0/l1. It will use one for 'next' and the other to hold |
| 15 | * the output value of 'last'. 'next' is not referenced again |
| 16 | * past the invocation of switch_to in the scheduler, so we need |
| 17 | * not preserve it's value. Hairy, but it lets us remove 2 loads |
| 18 | * and 2 stores in this critical code path. -DaveM |
| 19 | */ |
| 20 | #define switch_to(prev, next, last) \ |
| David S. Miller | f36391d | 2013-04-19 17:26:26 -0400 | [diff] [blame] | 21 | do { save_and_clear_fpu(); \ |
| David Howells | d550bbd | 2012-03-28 18:30:03 +0100 | [diff] [blame] | 22 | /* If you are tempted to conditionalize the following */ \ |
| 23 | /* so that ASI is only written if it changes, think again. */ \ |
| 24 | __asm__ __volatile__("wr %%g0, %0, %%asi" \ |
| Al Viro | dff933d | 2012-09-26 01:21:14 -0400 | [diff] [blame] | 25 | : : "r" (task_thread_info(next)->current_ds));\ |
| David Howells | d550bbd | 2012-03-28 18:30:03 +0100 | [diff] [blame] | 26 | trap_block[current_thread_info()->cpu].thread = \ |
| 27 | task_thread_info(next); \ |
| 28 | __asm__ __volatile__( \ |
| 29 | "mov %%g4, %%g7\n\t" \ |
| 30 | "stx %%i6, [%%sp + 2047 + 0x70]\n\t" \ |
| 31 | "stx %%i7, [%%sp + 2047 + 0x78]\n\t" \ |
| 32 | "rdpr %%wstate, %%o5\n\t" \ |
| 33 | "stx %%o6, [%%g6 + %6]\n\t" \ |
| 34 | "stb %%o5, [%%g6 + %5]\n\t" \ |
| 35 | "rdpr %%cwp, %%o5\n\t" \ |
| 36 | "stb %%o5, [%%g6 + %8]\n\t" \ |
| 37 | "wrpr %%g0, 15, %%pil\n\t" \ |
| 38 | "mov %4, %%g6\n\t" \ |
| 39 | "ldub [%4 + %8], %%g1\n\t" \ |
| 40 | "wrpr %%g1, %%cwp\n\t" \ |
| 41 | "ldx [%%g6 + %6], %%o6\n\t" \ |
| 42 | "ldub [%%g6 + %5], %%o5\n\t" \ |
| 43 | "ldub [%%g6 + %7], %%o7\n\t" \ |
| 44 | "wrpr %%o5, 0x0, %%wstate\n\t" \ |
| 45 | "ldx [%%sp + 2047 + 0x70], %%i6\n\t" \ |
| 46 | "ldx [%%sp + 2047 + 0x78], %%i7\n\t" \ |
| 47 | "ldx [%%g6 + %9], %%g4\n\t" \ |
| 48 | "wrpr %%g0, 14, %%pil\n\t" \ |
| 49 | "brz,pt %%o7, switch_to_pc\n\t" \ |
| 50 | " mov %%g7, %0\n\t" \ |
| Kirill Tkhai | 37d6fa3 | 2013-07-26 16:42:39 +0400 | [diff] [blame^] | 51 | "sethi %%hi(ret_from_fork), %%g1\n\t" \ |
| 52 | "jmpl %%g1 + %%lo(ret_from_fork), %%g0\n\t" \ |
| David Howells | d550bbd | 2012-03-28 18:30:03 +0100 | [diff] [blame] | 53 | " nop\n\t" \ |
| 54 | ".globl switch_to_pc\n\t" \ |
| 55 | "switch_to_pc:\n\t" \ |
| 56 | : "=&r" (last), "=r" (current), "=r" (current_thread_info_reg), \ |
| 57 | "=r" (__local_per_cpu_offset) \ |
| 58 | : "0" (task_thread_info(next)), \ |
| 59 | "i" (TI_WSTATE), "i" (TI_KSP), "i" (TI_NEW_CHILD), \ |
| 60 | "i" (TI_CWP), "i" (TI_TASK) \ |
| 61 | : "cc", \ |
| 62 | "g1", "g2", "g3", "g7", \ |
| 63 | "l1", "l2", "l3", "l4", "l5", "l6", "l7", \ |
| 64 | "i0", "i1", "i2", "i3", "i4", "i5", \ |
| 65 | "o0", "o1", "o2", "o3", "o4", "o5", "o7"); \ |
| 66 | } while(0) |
| 67 | |
| 68 | extern void synchronize_user_stack(void); |
| 69 | extern void fault_in_user_windows(void); |
| 70 | |
| 71 | #endif /* __SPARC64_SWITCH_TO_64_H */ |