diff options
Diffstat (limited to 'arch/sh/include/asm/switch_to_32.h')
| -rw-r--r-- | arch/sh/include/asm/switch_to_32.h | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/arch/sh/include/asm/switch_to_32.h b/arch/sh/include/asm/switch_to_32.h new file mode 100644 index 000000000000..0c065513e7ac --- /dev/null +++ b/arch/sh/include/asm/switch_to_32.h @@ -0,0 +1,134 @@ +#ifndef __ASM_SH_SWITCH_TO_32_H +#define __ASM_SH_SWITCH_TO_32_H + +#ifdef CONFIG_SH_DSP + +#define is_dsp_enabled(tsk) \ + (!!(tsk->thread.dsp_status.status & SR_DSP)) + +#define __restore_dsp(tsk) \ +do { \ + register u32 *__ts2 __asm__ ("r2") = \ + (u32 *)&tsk->thread.dsp_status; \ + __asm__ __volatile__ ( \ + ".balign 4\n\t" \ + "movs.l @r2+, a0\n\t" \ + "movs.l @r2+, a1\n\t" \ + "movs.l @r2+, a0g\n\t" \ + "movs.l @r2+, a1g\n\t" \ + "movs.l @r2+, m0\n\t" \ + "movs.l @r2+, m1\n\t" \ + "movs.l @r2+, x0\n\t" \ + "movs.l @r2+, x1\n\t" \ + "movs.l @r2+, y0\n\t" \ + "movs.l @r2+, y1\n\t" \ + "lds.l @r2+, dsr\n\t" \ + "ldc.l @r2+, rs\n\t" \ + "ldc.l @r2+, re\n\t" \ + "ldc.l @r2+, mod\n\t" \ + : : "r" (__ts2)); \ +} while (0) + +#define __save_dsp(tsk) \ +do { \ + register u32 *__ts2 __asm__ ("r2") = \ + (u32 *)&tsk->thread.dsp_status + 14; \ + \ + __asm__ __volatile__ ( \ + ".balign 4\n\t" \ + "stc.l mod, @-r2\n\t" \ + "stc.l re, @-r2\n\t" \ + "stc.l rs, @-r2\n\t" \ + "sts.l dsr, @-r2\n\t" \ + "movs.l y1, @-r2\n\t" \ + "movs.l y0, @-r2\n\t" \ + "movs.l x1, @-r2\n\t" \ + "movs.l x0, @-r2\n\t" \ + "movs.l m1, @-r2\n\t" \ + "movs.l m0, @-r2\n\t" \ + "movs.l a1g, @-r2\n\t" \ + "movs.l a0g, @-r2\n\t" \ + "movs.l a1, @-r2\n\t" \ + "movs.l a0, @-r2\n\t" \ + : : "r" (__ts2)); \ +} while (0) + +#else + +#define is_dsp_enabled(tsk) (0) +#define __save_dsp(tsk) do { } while (0) +#define __restore_dsp(tsk) do { } while (0) +#endif + +struct task_struct *__switch_to(struct task_struct *prev, + struct task_struct *next); + +/* + * switch_to() should switch tasks to task nr n, first + */ +#define switch_to(prev, next, last) \ +do { \ + register u32 *__ts1 __asm__ ("r1"); \ + register u32 *__ts2 __asm__ ("r2"); \ + register u32 *__ts4 __asm__ ("r4"); \ + register u32 *__ts5 __asm__ ("r5"); \ + register u32 *__ts6 __asm__ ("r6"); \ + register u32 __ts7 __asm__ ("r7"); \ + struct task_struct *__last; \ + \ + if (is_dsp_enabled(prev)) \ + __save_dsp(prev); \ + \ + __ts1 = (u32 *)&prev->thread.sp; \ + __ts2 = (u32 *)&prev->thread.pc; \ + __ts4 = (u32 *)prev; \ + __ts5 = (u32 *)next; \ + __ts6 = (u32 *)&next->thread.sp; \ + __ts7 = next->thread.pc; \ + \ + __asm__ __volatile__ ( \ + ".balign 4\n\t" \ + "stc.l gbr, @-r15\n\t" \ + "sts.l pr, @-r15\n\t" \ + "mov.l r8, @-r15\n\t" \ + "mov.l r9, @-r15\n\t" \ + "mov.l r10, @-r15\n\t" \ + "mov.l r11, @-r15\n\t" \ + "mov.l r12, @-r15\n\t" \ + "mov.l r13, @-r15\n\t" \ + "mov.l r14, @-r15\n\t" \ + "mov.l r15, @r1\t! save SP\n\t" \ + "mov.l @r6, r15\t! change to new stack\n\t" \ + "mova 1f, %0\n\t" \ + "mov.l %0, @r2\t! save PC\n\t" \ + "mov.l 2f, %0\n\t" \ + "jmp @%0\t! call __switch_to\n\t" \ + " lds r7, pr\t! with return to new PC\n\t" \ + ".balign 4\n" \ + "2:\n\t" \ + ".long __switch_to\n" \ + "1:\n\t" \ + "mov.l @r15+, r14\n\t" \ + "mov.l @r15+, r13\n\t" \ + "mov.l @r15+, r12\n\t" \ + "mov.l @r15+, r11\n\t" \ + "mov.l @r15+, r10\n\t" \ + "mov.l @r15+, r9\n\t" \ + "mov.l @r15+, r8\n\t" \ + "lds.l @r15+, pr\n\t" \ + "ldc.l @r15+, gbr\n\t" \ + : "=z" (__last) \ + : "r" (__ts1), "r" (__ts2), "r" (__ts4), \ + "r" (__ts5), "r" (__ts6), "r" (__ts7) \ + : "r3", "t"); \ + \ + last = __last; \ +} while (0) + +#define finish_arch_switch(prev) \ +do { \ + if (is_dsp_enabled(prev)) \ + __restore_dsp(prev); \ +} while (0) + +#endif /* __ASM_SH_SWITCH_TO_32_H */ |