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->dsisr; 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->dsisr; 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