linux_dsm_epyc7002/arch/sparc/power/hibernate_asm.S
Tkhai Kirill bdde6b3c8b sparc64: Hibernation support
This patch adds CONFIG_HIBERNATION support for sparc64
architecture. The suspend function is the same as on another
platforms. The restore function uses Bypass feature of MMU
which allows to make the process more comfortable and plesant.

Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
CC: David Miller <davem@davemloft.net>
CC: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-03-20 11:06:54 -07:00

132 lines
2.2 KiB
ArmAsm

/*
* hibernate_asm.S: Hibernaton support specific for sparc64.
*
* Copyright (C) 2013 Kirill V Tkhai (tkhai@yandex.ru)
*/
#include <linux/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/cpudata.h>
#include <asm/page.h>
ENTRY(swsusp_arch_suspend)
save %sp, -128, %sp
save %sp, -128, %sp
flushw
setuw saved_context, %g3
/* Save window regs */
rdpr %cwp, %g2
stx %g2, [%g3 + SC_REG_CWP]
rdpr %wstate, %g2
stx %g2, [%g3 + SC_REG_WSTATE]
stx %fp, [%g3 + SC_REG_FP]
/* Save state regs */
rdpr %tick, %g2
stx %g2, [%g3 + SC_REG_TICK]
rdpr %pstate, %g2
stx %g2, [%g3 + SC_REG_PSTATE]
/* Save global regs */
stx %g4, [%g3 + SC_REG_G4]
stx %g5, [%g3 + SC_REG_G5]
stx %g6, [%g3 + SC_REG_G6]
call swsusp_save
nop
mov %o0, %i0
restore
mov %o0, %i0
ret
restore
ENTRY(swsusp_arch_resume)
/* Write restore_pblist to %l0 */
sethi %hi(restore_pblist), %l0
ldx [%l0 + %lo(restore_pblist)], %l0
call __flush_tlb_all
nop
/* Write PAGE_OFFSET to %g7 */
sethi %uhi(PAGE_OFFSET), %g7
sllx %g7, 32, %g7
setuw (PAGE_SIZE-8), %g3
/* Use MMU Bypass */
rd %asi, %g1
wr %g0, ASI_PHYS_USE_EC, %asi
ba fill_itlb
nop
pbe_loop:
cmp %l0, %g0
be restore_ctx
sub %l0, %g7, %l0
ldxa [%l0 ] %asi, %l1 /* address */
ldxa [%l0 + 8] %asi, %l2 /* orig_address */
/* phys addr */
sub %l1, %g7, %l1
sub %l2, %g7, %l2
mov %g3, %l3 /* PAGE_SIZE-8 */
copy_loop:
ldxa [%l1 + %l3] ASI_PHYS_USE_EC, %g2
stxa %g2, [%l2 + %l3] ASI_PHYS_USE_EC
cmp %l3, %g0
bne copy_loop
sub %l3, 8, %l3
/* next pbe */
ba pbe_loop
ldxa [%l0 + 16] %asi, %l0
restore_ctx:
setuw saved_context, %g3
/* Restore window regs */
wrpr %g0, 0, %canrestore
wrpr %g0, 0, %otherwin
wrpr %g0, 6, %cansave
wrpr %g0, 0, %cleanwin
ldxa [%g3 + SC_REG_CWP] %asi, %g2
wrpr %g2, %cwp
ldxa [%g3 + SC_REG_WSTATE] %asi, %g2
wrpr %g2, %wstate
ldxa [%g3 + SC_REG_FP] %asi, %fp
/* Restore state regs */
ldxa [%g3 + SC_REG_PSTATE] %asi, %g2
wrpr %g2, %pstate
ldxa [%g3 + SC_REG_TICK] %asi, %g2
wrpr %g2, %tick
/* Restore global regs */
ldxa [%g3 + SC_REG_G4] %asi, %g4
ldxa [%g3 + SC_REG_G5] %asi, %g5
ldxa [%g3 + SC_REG_G6] %asi, %g6
wr %g1, %g0, %asi
restore
restore
wrpr %g0, 14, %pil
retl
mov %g0, %o0
fill_itlb:
ba pbe_loop
wrpr %g0, 15, %pil