d550bbd40c
Disintegrate asm/system.h for Sparc. Signed-off-by: David Howells <dhowells@redhat.com> cc: sparclinux@vger.kernel.org
107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
#ifndef __SPARC_SWITCH_TO_H
|
|
#define __SPARC_SWITCH_TO_H
|
|
|
|
#include <asm/smp.h>
|
|
|
|
extern struct thread_info *current_set[NR_CPUS];
|
|
|
|
/*
|
|
* Flush windows so that the VM switch which follows
|
|
* would not pull the stack from under us.
|
|
*
|
|
* SWITCH_ENTER and SWITH_DO_LAZY_FPU do not work yet (e.g. SMP does not work)
|
|
* XXX WTF is the above comment? Found in late teen 2.4.x.
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
#define SWITCH_ENTER(prv) \
|
|
do { \
|
|
if (test_tsk_thread_flag(prv, TIF_USEDFPU)) { \
|
|
put_psr(get_psr() | PSR_EF); \
|
|
fpsave(&(prv)->thread.float_regs[0], &(prv)->thread.fsr, \
|
|
&(prv)->thread.fpqueue[0], &(prv)->thread.fpqdepth); \
|
|
clear_tsk_thread_flag(prv, TIF_USEDFPU); \
|
|
(prv)->thread.kregs->psr &= ~PSR_EF; \
|
|
} \
|
|
} while(0)
|
|
|
|
#define SWITCH_DO_LAZY_FPU(next) /* */
|
|
#else
|
|
#define SWITCH_ENTER(prv) /* */
|
|
#define SWITCH_DO_LAZY_FPU(nxt) \
|
|
do { \
|
|
if (last_task_used_math != (nxt)) \
|
|
(nxt)->thread.kregs->psr&=~PSR_EF; \
|
|
} while(0)
|
|
#endif
|
|
|
|
#define prepare_arch_switch(next) do { \
|
|
__asm__ __volatile__( \
|
|
".globl\tflush_patch_switch\nflush_patch_switch:\n\t" \
|
|
"save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
|
|
"save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
|
|
"save %sp, -0x40, %sp\n\t" \
|
|
"restore; restore; restore; restore; restore; restore; restore"); \
|
|
} while(0)
|
|
|
|
/* Much care has gone into this code, do not touch it.
|
|
*
|
|
* We need to loadup regs l0/l1 for the newly forked child
|
|
* case because the trap return path relies on those registers
|
|
* holding certain values, gcc is told that they are clobbered.
|
|
* Gcc needs registers for 3 values in and 1 value out, so we
|
|
* clobber every non-fixed-usage register besides l2/l3/o4/o5. -DaveM
|
|
*
|
|
* Hey Dave, that do not touch sign is too much of an incentive
|
|
* - Anton & Pete
|
|
*/
|
|
#define switch_to(prev, next, last) do { \
|
|
SWITCH_ENTER(prev); \
|
|
SWITCH_DO_LAZY_FPU(next); \
|
|
cpumask_set_cpu(smp_processor_id(), mm_cpumask(next->active_mm)); \
|
|
__asm__ __volatile__( \
|
|
"sethi %%hi(here - 0x8), %%o7\n\t" \
|
|
"mov %%g6, %%g3\n\t" \
|
|
"or %%o7, %%lo(here - 0x8), %%o7\n\t" \
|
|
"rd %%psr, %%g4\n\t" \
|
|
"std %%sp, [%%g6 + %4]\n\t" \
|
|
"rd %%wim, %%g5\n\t" \
|
|
"wr %%g4, 0x20, %%psr\n\t" \
|
|
"nop\n\t" \
|
|
"std %%g4, [%%g6 + %3]\n\t" \
|
|
"ldd [%2 + %3], %%g4\n\t" \
|
|
"mov %2, %%g6\n\t" \
|
|
".globl patchme_store_new_current\n" \
|
|
"patchme_store_new_current:\n\t" \
|
|
"st %2, [%1]\n\t" \
|
|
"wr %%g4, 0x20, %%psr\n\t" \
|
|
"nop\n\t" \
|
|
"nop\n\t" \
|
|
"nop\n\t" /* LEON needs all 3 nops: load to %sp depends on CWP. */ \
|
|
"ldd [%%g6 + %4], %%sp\n\t" \
|
|
"wr %%g5, 0x0, %%wim\n\t" \
|
|
"ldd [%%sp + 0x00], %%l0\n\t" \
|
|
"ldd [%%sp + 0x38], %%i6\n\t" \
|
|
"wr %%g4, 0x0, %%psr\n\t" \
|
|
"nop\n\t" \
|
|
"nop\n\t" \
|
|
"jmpl %%o7 + 0x8, %%g0\n\t" \
|
|
" ld [%%g3 + %5], %0\n\t" \
|
|
"here:\n" \
|
|
: "=&r" (last) \
|
|
: "r" (&(current_set[hard_smp_processor_id()])), \
|
|
"r" (task_thread_info(next)), \
|
|
"i" (TI_KPSR), \
|
|
"i" (TI_KSP), \
|
|
"i" (TI_TASK) \
|
|
: "g1", "g2", "g3", "g4", "g5", "g7", \
|
|
"l0", "l1", "l3", "l4", "l5", "l6", "l7", \
|
|
"i0", "i1", "i2", "i3", "i4", "i5", \
|
|
"o0", "o1", "o2", "o3", "o7"); \
|
|
} while(0)
|
|
|
|
extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
|
|
void *fpqueue, unsigned long *fpqdepth);
|
|
extern void synchronize_user_stack(void);
|
|
|
|
#endif /* __SPARC_SWITCH_TO_H */
|