1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  */
4 
5 #include <linux/kernel.h>
6 #include <linux/printk.h>
7 #include <linux/ptrace.h>
8 
9 #include <asm/reg.h>
10 #include <asm/cacheflush.h>
11 
12 int machine_check_440A(struct pt_regs *regs)
13 {
14 	unsigned long reason = regs->esr;
15 
16 	printk("Machine check in kernel mode.\n");
17 	if (reason & ESR_IMCP){
18 		printk("Instruction Synchronous Machine Check exception\n");
19 		mtspr(SPRN_ESR, reason & ~ESR_IMCP);
20 	}
21 	else {
22 		u32 mcsr = mfspr(SPRN_MCSR);
23 		if (mcsr & MCSR_IB)
24 			printk("Instruction Read PLB Error\n");
25 		if (mcsr & MCSR_DRB)
26 			printk("Data Read PLB Error\n");
27 		if (mcsr & MCSR_DWB)
28 			printk("Data Write PLB Error\n");
29 		if (mcsr & MCSR_TLBP)
30 			printk("TLB Parity Error\n");
31 		if (mcsr & MCSR_ICP){
32 			flush_instruction_cache();
33 			printk("I-Cache Parity Error\n");
34 		}
35 		if (mcsr & MCSR_DCSP)
36 			printk("D-Cache Search Parity Error\n");
37 		if (mcsr & MCSR_DCFP)
38 			printk("D-Cache Flush Parity Error\n");
39 		if (mcsr & MCSR_IMPE)
40 			printk("Machine Check exception is imprecise\n");
41 
42 		/* Clear MCSR */
43 		mtspr(SPRN_MCSR, mcsr);
44 	}
45 	return 0;
46 }
47 
48 #ifdef CONFIG_PPC_47x
49 int machine_check_47x(struct pt_regs *regs)
50 {
51 	unsigned long reason = regs->esr;
52 	u32 mcsr;
53 
54 	printk(KERN_ERR "Machine check in kernel mode.\n");
55 	if (reason & ESR_IMCP) {
56 		printk(KERN_ERR "Instruction Synchronous Machine Check exception\n");
57 		mtspr(SPRN_ESR, reason & ~ESR_IMCP);
58 		return 0;
59 	}
60 	mcsr = mfspr(SPRN_MCSR);
61 	if (mcsr & MCSR_IB)
62 		printk(KERN_ERR "Instruction Read PLB Error\n");
63 	if (mcsr & MCSR_DRB)
64 		printk(KERN_ERR "Data Read PLB Error\n");
65 	if (mcsr & MCSR_DWB)
66 		printk(KERN_ERR "Data Write PLB Error\n");
67 	if (mcsr & MCSR_TLBP)
68 		printk(KERN_ERR "TLB Parity Error\n");
69 	if (mcsr & MCSR_ICP) {
70 		flush_instruction_cache();
71 		printk(KERN_ERR "I-Cache Parity Error\n");
72 	}
73 	if (mcsr & MCSR_DCSP)
74 		printk(KERN_ERR "D-Cache Search Parity Error\n");
75 	if (mcsr & PPC47x_MCSR_GPR)
76 		printk(KERN_ERR "GPR Parity Error\n");
77 	if (mcsr & PPC47x_MCSR_FPR)
78 		printk(KERN_ERR "FPR Parity Error\n");
79 	if (mcsr & PPC47x_MCSR_IPR)
80 		printk(KERN_ERR "Machine Check exception is imprecise\n");
81 
82 	/* Clear MCSR */
83 	mtspr(SPRN_MCSR, mcsr);
84 
85 	return 0;
86 }
87 #endif /* CONFIG_PPC_47x */
88