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/* $Id: switch.S,v 1.18 1996/04/03 02:15:00 davem Exp $
* switch.S: Sparc task switch code.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#include <asm/head.h>
#include <asm/asi.h>
#include <asm/contregs.h>
#include <asm/cprefix.h>
#include <asm/psr.h>
#include <asm/asmmacro.h>
#include <asm/ptrace.h>
#include <asm/winmacro.h>
#define sw_ntask g1
#define sw_psr g4
#define sw_wim g5
#define sw_tmp g6
#define sw_ctx g7
/* Context switch code. The new process's task_struct
* ptr is passed as the first parameter.
*
* First successful task switch 05/13/95 21:52:37
*/
.align 4
.globl C_LABEL(sparc_switch_to)
C_LABEL(sparc_switch_to):
mov %o0, %sw_ntask
/* Save kernel state. */
FLUSH_ALL_KERNEL_WINDOWS;
STORE_WINDOW(sp)
rd %psr, %sw_psr
LOAD_CURRENT(sw_tmp, sw_wim)
rd %wim, %sw_wim
std %sw_psr, [%sw_tmp + THREAD_KPSR]
std %sp, [%sw_tmp + THREAD_KSP]
/* Load new kernel state. */
wr %sw_psr, PSR_ET, %psr
WRITE_PAUSE
#ifdef __SMP__
GET_PROCESSOR_OFFSET(sw_psr)
set C_LABEL(current_set), %sw_tmp
st %sw_ntask, [%sw_tmp + %sw_psr]
#else
sethi %hi(C_LABEL(current_set)), %sw_tmp
st %sw_ntask, [%sw_tmp + %lo(C_LABEL(current_set))]
#endif
ldd [%sw_ntask + THREAD_KPSR], %sw_psr
wr %sw_psr, PSR_ET, %psr
WRITE_PAUSE
wr %sw_wim, 0x0, %wim
WRITE_PAUSE
ldd [%sw_ntask + THREAD_KSP], %sp
LOAD_WINDOW(sp)
wr %sw_psr, 0x0, %psr ! traps back on
WRITE_PAUSE
retl
nop
#ifdef __SMP__
/* Because of nasty register windows this is the only way
* to start a processor into its cpu_idle() thread.
*/
.globl C_LABEL(sparc_cpusched)
C_LABEL(sparc_cpusched):
LOAD_CURRENT(g1, g2)
rd %psr, %g7
wr %g7, PSR_ET, %psr
WRITE_PAUSE
ldd [%g1 + THREAD_KPSR], %g2
wr %g2, PSR_ET, %psr
WRITE_PAUSE
wr %g3, 0x0, %wim
WRITE_PAUSE
ldd [%g1 + THREAD_KSP], %sp
LOAD_WINDOW(sp)
wr %g2, 0x0, %psr
WRITE_PAUSE
retl
nop
#endif
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