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/tlbflush.h>
6 #include <linux/suspend.h>
7
8 static u32 saved_crmd;
9 static u32 saved_prmd;
10 static u32 saved_euen;
11 static u32 saved_ecfg;
12 static u64 saved_pcpu_base;
13 struct pt_regs saved_regs;
14
15 void save_processor_state(void)
16 {
17 saved_crmd = csr_read32(LOONGARCH_CSR_CRMD);
18 saved_prmd = csr_read32(LOONGARCH_CSR_PRMD);
19 saved_euen = csr_read32(LOONGARCH_CSR_EUEN);
20 saved_ecfg = csr_read32(LOONGARCH_CSR_ECFG);
21 saved_pcpu_base = csr_read64(PERCPU_BASE_KS);
22
23 if (is_fpu_owner())
24 save_fp(current);
25 }
26
27 void restore_processor_state(void)
28 {
29 csr_write32(saved_crmd, LOONGARCH_CSR_CRMD);
30 csr_write32(saved_prmd, LOONGARCH_CSR_PRMD);
31 csr_write32(saved_euen, LOONGARCH_CSR_EUEN);
32 csr_write32(saved_ecfg, LOONGARCH_CSR_ECFG);
33 csr_write64(saved_pcpu_base, PERCPU_BASE_KS);
34
35 if (is_fpu_owner())
36 restore_fp(current);
37 }
38
39 int pfn_is_nosave(unsigned long pfn)
40 {
41 unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin));
42 unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end));
43
44 return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
45 }
46
47 extern int swsusp_asm_suspend(void);
48
49 int swsusp_arch_suspend(void)
50 {
51 enable_pci_wakeup();
52 return swsusp_asm_suspend();
53 }
54
55 extern int swsusp_asm_resume(void);
56
57 int swsusp_arch_resume(void)
58 {
59 /* Avoid TLB mismatch during and after kernel resume */
60 local_flush_tlb_all();
61 return swsusp_asm_resume();
62 }
63
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