| David Howells | e839ca5 | 2012-03-28 18:30:03 +0100 | [diff] [blame] | 1 | #ifndef __ASM_SH_SWITCH_TO_32_H |
| 2 | #define __ASM_SH_SWITCH_TO_32_H |
| 3 | |
| 4 | #ifdef CONFIG_SH_DSP |
| 5 | |
| 6 | #define is_dsp_enabled(tsk) \ |
| 7 | (!!(tsk->thread.dsp_status.status & SR_DSP)) |
| 8 | |
| 9 | #define __restore_dsp(tsk) \ |
| 10 | do { \ |
| 11 | register u32 *__ts2 __asm__ ("r2") = \ |
| 12 | (u32 *)&tsk->thread.dsp_status; \ |
| 13 | __asm__ __volatile__ ( \ |
| 14 | ".balign 4\n\t" \ |
| 15 | "movs.l @r2+, a0\n\t" \ |
| 16 | "movs.l @r2+, a1\n\t" \ |
| 17 | "movs.l @r2+, a0g\n\t" \ |
| 18 | "movs.l @r2+, a1g\n\t" \ |
| 19 | "movs.l @r2+, m0\n\t" \ |
| 20 | "movs.l @r2+, m1\n\t" \ |
| 21 | "movs.l @r2+, x0\n\t" \ |
| 22 | "movs.l @r2+, x1\n\t" \ |
| 23 | "movs.l @r2+, y0\n\t" \ |
| 24 | "movs.l @r2+, y1\n\t" \ |
| 25 | "lds.l @r2+, dsr\n\t" \ |
| 26 | "ldc.l @r2+, rs\n\t" \ |
| 27 | "ldc.l @r2+, re\n\t" \ |
| 28 | "ldc.l @r2+, mod\n\t" \ |
| 29 | : : "r" (__ts2)); \ |
| 30 | } while (0) |
| 31 | |
| 32 | #define __save_dsp(tsk) \ |
| 33 | do { \ |
| 34 | register u32 *__ts2 __asm__ ("r2") = \ |
| 35 | (u32 *)&tsk->thread.dsp_status + 14; \ |
| 36 | \ |
| 37 | __asm__ __volatile__ ( \ |
| 38 | ".balign 4\n\t" \ |
| 39 | "stc.l mod, @-r2\n\t" \ |
| 40 | "stc.l re, @-r2\n\t" \ |
| 41 | "stc.l rs, @-r2\n\t" \ |
| 42 | "sts.l dsr, @-r2\n\t" \ |
| 43 | "movs.l y1, @-r2\n\t" \ |
| 44 | "movs.l y0, @-r2\n\t" \ |
| 45 | "movs.l x1, @-r2\n\t" \ |
| 46 | "movs.l x0, @-r2\n\t" \ |
| 47 | "movs.l m1, @-r2\n\t" \ |
| 48 | "movs.l m0, @-r2\n\t" \ |
| 49 | "movs.l a1g, @-r2\n\t" \ |
| 50 | "movs.l a0g, @-r2\n\t" \ |
| 51 | "movs.l a1, @-r2\n\t" \ |
| 52 | "movs.l a0, @-r2\n\t" \ |
| 53 | : : "r" (__ts2)); \ |
| 54 | } while (0) |
| 55 | |
| 56 | #else |
| 57 | |
| 58 | #define is_dsp_enabled(tsk) (0) |
| 59 | #define __save_dsp(tsk) do { } while (0) |
| 60 | #define __restore_dsp(tsk) do { } while (0) |
| 61 | #endif |
| 62 | |
| 63 | struct task_struct *__switch_to(struct task_struct *prev, |
| 64 | struct task_struct *next); |
| 65 | |
| 66 | /* |
| 67 | * switch_to() should switch tasks to task nr n, first |
| 68 | */ |
| 69 | #define switch_to(prev, next, last) \ |
| 70 | do { \ |
| 71 | register u32 *__ts1 __asm__ ("r1"); \ |
| 72 | register u32 *__ts2 __asm__ ("r2"); \ |
| 73 | register u32 *__ts4 __asm__ ("r4"); \ |
| 74 | register u32 *__ts5 __asm__ ("r5"); \ |
| 75 | register u32 *__ts6 __asm__ ("r6"); \ |
| 76 | register u32 __ts7 __asm__ ("r7"); \ |
| 77 | struct task_struct *__last; \ |
| 78 | \ |
| 79 | if (is_dsp_enabled(prev)) \ |
| 80 | __save_dsp(prev); \ |
| 81 | \ |
| 82 | __ts1 = (u32 *)&prev->thread.sp; \ |
| 83 | __ts2 = (u32 *)&prev->thread.pc; \ |
| 84 | __ts4 = (u32 *)prev; \ |
| 85 | __ts5 = (u32 *)next; \ |
| 86 | __ts6 = (u32 *)&next->thread.sp; \ |
| 87 | __ts7 = next->thread.pc; \ |
| 88 | \ |
| 89 | __asm__ __volatile__ ( \ |
| 90 | ".balign 4\n\t" \ |
| 91 | "stc.l gbr, @-r15\n\t" \ |
| 92 | "sts.l pr, @-r15\n\t" \ |
| 93 | "mov.l r8, @-r15\n\t" \ |
| 94 | "mov.l r9, @-r15\n\t" \ |
| 95 | "mov.l r10, @-r15\n\t" \ |
| 96 | "mov.l r11, @-r15\n\t" \ |
| 97 | "mov.l r12, @-r15\n\t" \ |
| 98 | "mov.l r13, @-r15\n\t" \ |
| 99 | "mov.l r14, @-r15\n\t" \ |
| 100 | "mov.l r15, @r1\t! save SP\n\t" \ |
| 101 | "mov.l @r6, r15\t! change to new stack\n\t" \ |
| 102 | "mova 1f, %0\n\t" \ |
| 103 | "mov.l %0, @r2\t! save PC\n\t" \ |
| 104 | "mov.l 2f, %0\n\t" \ |
| 105 | "jmp @%0\t! call __switch_to\n\t" \ |
| 106 | " lds r7, pr\t! with return to new PC\n\t" \ |
| 107 | ".balign 4\n" \ |
| 108 | "2:\n\t" \ |
| 109 | ".long __switch_to\n" \ |
| 110 | "1:\n\t" \ |
| 111 | "mov.l @r15+, r14\n\t" \ |
| 112 | "mov.l @r15+, r13\n\t" \ |
| 113 | "mov.l @r15+, r12\n\t" \ |
| 114 | "mov.l @r15+, r11\n\t" \ |
| 115 | "mov.l @r15+, r10\n\t" \ |
| 116 | "mov.l @r15+, r9\n\t" \ |
| 117 | "mov.l @r15+, r8\n\t" \ |
| 118 | "lds.l @r15+, pr\n\t" \ |
| 119 | "ldc.l @r15+, gbr\n\t" \ |
| 120 | : "=z" (__last) \ |
| 121 | : "r" (__ts1), "r" (__ts2), "r" (__ts4), \ |
| 122 | "r" (__ts5), "r" (__ts6), "r" (__ts7) \ |
| 123 | : "r3", "t"); \ |
| 124 | \ |
| 125 | last = __last; \ |
| 126 | } while (0) |
| 127 | |
| 128 | #define finish_arch_switch(prev) \ |
| 129 | do { \ |
| 130 | if (is_dsp_enabled(prev)) \ |
| 131 | __restore_dsp(prev); \ |
| 132 | } while (0) |
| 133 | |
| 134 | #endif /* __ASM_SH_SWITCH_TO_32_H */ |