hibernate.c

 1// SPDX-License-Identifier: GPL-2.0
 2#include <asm/fpu.h>
 3#include <asm/loongson.h>
 4#include <asm/sections.h>
 5#include <asm/time.h>
 6#include <asm/tlbflush.h>
 7#include <linux/suspend.h>
 8
 9static u32 saved_crmd;
10static u32 saved_prmd;
11static u32 saved_euen;
12static u32 saved_ecfg;
13static unsigned long saved_pcpu_base;
14struct pt_regs saved_regs;
15
16void save_processor_state(void)
17{
18	save_counter();
19	saved_crmd = csr_read32(LOONGARCH_CSR_CRMD);
20	saved_prmd = csr_read32(LOONGARCH_CSR_PRMD);
21	saved_euen = csr_read32(LOONGARCH_CSR_EUEN);
22	saved_ecfg = csr_read32(LOONGARCH_CSR_ECFG);
23	saved_pcpu_base = csr_read(PERCPU_BASE_KS);
24
25	if (is_fpu_owner())
26		save_fp(current);
27}
28
29void restore_processor_state(void)
30{
31	sync_counter();
32	csr_write32(saved_crmd, LOONGARCH_CSR_CRMD);
33	csr_write32(saved_prmd, LOONGARCH_CSR_PRMD);
34	csr_write32(saved_euen, LOONGARCH_CSR_EUEN);
35	csr_write32(saved_ecfg, LOONGARCH_CSR_ECFG);
36	csr_write(saved_pcpu_base, PERCPU_BASE_KS);
37
38	if (is_fpu_owner())
39		restore_fp(current);
40}
41
42int pfn_is_nosave(unsigned long pfn)
43{
44	unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin));
45	unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end));
46
47	return	(pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
48}
49
50extern int swsusp_asm_suspend(void);
51
52int swsusp_arch_suspend(void)
53{
54	enable_pci_wakeup();
55	return swsusp_asm_suspend();
56}
57
58extern int swsusp_asm_resume(void);
59
60int swsusp_arch_resume(void)
61{
62	/* Avoid TLB mismatch during and after kernel resume */
63	local_flush_tlb_all();
64	return swsusp_asm_resume();
65}