diff options
Diffstat (limited to 'target/linux/realtek/files/arch/rlx/kernel/rlx-switch.S')
| -rw-r--r-- | target/linux/realtek/files/arch/rlx/kernel/rlx-switch.S | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/target/linux/realtek/files/arch/rlx/kernel/rlx-switch.S b/target/linux/realtek/files/arch/rlx/kernel/rlx-switch.S new file mode 100644 index 000000000..b3e27a5f1 --- /dev/null +++ b/target/linux/realtek/files/arch/rlx/kernel/rlx-switch.S @@ -0,0 +1,66 @@ +/* + * r2300_switch.S: R2300 specific task switching code. + * + * Copyright (C) 1994, 1995, 1996, 1999 by Ralf Baechle + * Copyright (C) 1994, 1995, 1996 by Andreas Busse + * + * Multi-cpu abstraction and macros for easier reading: + * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com) + * + * Further modifications to make this work: + * Copyright (c) 1998-2000 Harald Koerfgen + */ +#include <asm/asm.h> +#include <asm/cachectl.h> +#include <asm/rlxregs.h> +#include <asm/asm-offsets.h> +#include <asm/page.h> +#include <asm/regdef.h> +#include <asm/stackframe.h> +#include <asm/thread_info.h> + +#include <asm/asmmacro.h> + + .set mips1 + .align 5 + +/* + * Offset to the current process status flags, the first 32 bytes of the + * stack are not used. + */ +#define ST_OFF (_THREAD_SIZE - 32 - PT_SIZE + PT_STATUS) + +/* + * task_struct *resume(task_struct *prev, task_struct *next, + * struct thread_info *next_ti) ) + */ +LEAF(resume) +#ifndef CONFIG_CPU_HAS_LLSC + sw zero, ll_bit +#endif + mfc0 t1, CP0_STATUS + sw t1, THREAD_STATUS(a0) + cpu_save_nonscratch a0 + sw ra, THREAD_REG31(a0) + + /* + * The order of restoring the registers takes care of the race + * updating $28, $29 and kernelsp without disabling ints. + */ + move $28, a2 + cpu_restore_nonscratch a1 + + addiu t1, $28, _THREAD_SIZE - 32 + sw t1, kernelsp + + mfc0 t1, CP0_STATUS /* Do we really need this? */ + li a3, 0xff01 + and t1, a3 + lw a2, THREAD_STATUS(a1) + nor a3, $0, a3 + and a2, a3 + or a2, t1 + mtc0 a2, CP0_STATUS + move v0, a0 + jr ra + END(resume) |