traps.c
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- /* $Id: traps.c,v 1.82 2001/11/18 00:12:56 davem Exp $
- * arch/sparc64/kernel/traps.c
- *
- * Copyright (C) 1995,1997 David S. Miller (davem@caip.rutgers.edu)
- * Copyright (C) 1997,1999,2000 Jakub Jelinek (jakub@redhat.com)
- */
- /*
- * I like traps on v9, :))))
- */
- #include <linux/config.h>
- #include <linux/sched.h> /* for jiffies */
- #include <linux/kernel.h>
- #include <linux/signal.h>
- #include <linux/smp.h>
- #include <linux/smp_lock.h>
- #include <linux/mm.h>
- #include <asm/delay.h>
- #include <asm/system.h>
- #include <asm/ptrace.h>
- #include <asm/oplib.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/unistd.h>
- #include <asm/uaccess.h>
- #include <asm/fpumacro.h>
- #include <asm/lsu.h>
- #include <asm/dcu.h>
- #include <asm/estate.h>
- #include <asm/chafsr.h>
- #include <asm/psrcompat.h>
- #include <asm/processor.h>
- #ifdef CONFIG_KMOD
- #include <linux/kmod.h>
- #endif
- /* When an irrecoverable trap occurs at tl > 0, the trap entry
- * code logs the trap state registers at every level in the trap
- * stack. It is found at (pt_regs + sizeof(pt_regs)) and the layout
- * is as follows:
- */
- struct tl1_traplog {
- struct {
- unsigned long tstate;
- unsigned long tpc;
- unsigned long tnpc;
- unsigned long tt;
- } trapstack[4];
- unsigned long tl;
- };
- static void dump_tl1_traplog(struct tl1_traplog *p)
- {
- int i;
- printk("TRAPLOG: Error at trap level 0x%lx, dumping track stack.n",
- p->tl);
- for (i = 0; i < 4; i++) {
- printk(KERN_CRIT
- "TRAPLOG: Trap level %d TSTATE[%016lx] TPC[%016lx] "
- "TNPC[%016lx] TT[%lx]n",
- i + 1,
- p->trapstack[i].tstate, p->trapstack[i].tpc,
- p->trapstack[i].tnpc, p->trapstack[i].tt);
- }
- }
- void bad_trap (struct pt_regs *regs, long lvl)
- {
- char buffer[32];
- siginfo_t info;
- if (lvl < 0x100) {
- sprintf(buffer, "Bad hw trap %lx at tl0n", lvl);
- die_if_kernel(buffer, regs);
- }
- lvl -= 0x100;
- if (regs->tstate & TSTATE_PRIV) {
- sprintf(buffer, "Kernel bad sw trap %lx", lvl);
- die_if_kernel (buffer, regs);
- }
- if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- regs->tpc &= 0xffffffff;
- regs->tnpc &= 0xffffffff;
- }
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLTRP;
- info.si_addr = (void *)regs->tpc;
- info.si_trapno = lvl;
- force_sig_info(SIGILL, &info, current);
- }
- void bad_trap_tl1 (struct pt_regs *regs, long lvl)
- {
- char buffer[32];
-
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- sprintf (buffer, "Bad trap %lx at tl>0", lvl);
- die_if_kernel (buffer, regs);
- }
- #ifdef CONFIG_DEBUG_BUGVERBOSE
- void do_BUG(const char *file, int line)
- {
- bust_spinlocks(1);
- printk("kernel BUG at %s:%d!n", file, line);
- }
- #endif
- void instruction_access_exception(struct pt_regs *regs,
- unsigned long sfsr, unsigned long sfar)
- {
- siginfo_t info;
- if (regs->tstate & TSTATE_PRIV) {
- printk("instruction_access_exception: SFSR[%016lx] SFAR[%016lx], going.n",
- sfsr, sfar);
- die_if_kernel("Iax", regs);
- }
- if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- regs->tpc &= 0xffffffff;
- regs->tnpc &= 0xffffffff;
- }
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = SEGV_MAPERR;
- info.si_addr = (void *)regs->tpc;
- info.si_trapno = 0;
- force_sig_info(SIGSEGV, &info, current);
- }
- void instruction_access_exception_tl1(struct pt_regs *regs,
- unsigned long sfsr, unsigned long sfar)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- instruction_access_exception(regs, sfsr, sfar);
- }
- void data_access_exception (struct pt_regs *regs,
- unsigned long sfsr, unsigned long sfar)
- {
- siginfo_t info;
- if (regs->tstate & TSTATE_PRIV) {
- /* Test if this comes from uaccess places. */
- unsigned long fixup, g2;
- g2 = regs->u_regs[UREG_G2];
- if ((fixup = search_exception_table (regs->tpc, &g2))) {
- /* Ouch, somebody is trying ugly VM hole tricks on us... */
- #ifdef DEBUG_EXCEPTIONS
- printk("Exception: PC<%016lx> faddr<UNKNOWN>n", regs->tpc);
- printk("EX_TABLE: insn<%016lx> fixup<%016lx> "
- "g2<%016lx>n", regs->tpc, fixup, g2);
- #endif
- regs->tpc = fixup;
- regs->tnpc = regs->tpc + 4;
- regs->u_regs[UREG_G2] = g2;
- return;
- }
- /* Shit... */
- printk("data_access_exception: SFSR[%016lx] SFAR[%016lx], going.n",
- sfsr, sfar);
- die_if_kernel("Dax", regs);
- }
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- info.si_code = SEGV_MAPERR;
- info.si_addr = (void *)sfar;
- info.si_trapno = 0;
- force_sig_info(SIGSEGV, &info, current);
- }
- #ifdef CONFIG_PCI
- /* This is really pathetic... */
- extern volatile int pci_poke_in_progress;
- extern volatile int pci_poke_cpu;
- extern volatile int pci_poke_faulted;
- #endif
- /* When access exceptions happen, we must do this. */
- static void spitfire_clean_and_reenable_l1_caches(void)
- {
- unsigned long va;
- if (tlb_type != spitfire)
- BUG();
- /* Clean 'em. */
- for (va = 0; va < (PAGE_SIZE << 1); va += 32) {
- spitfire_put_icache_tag(va, 0x0);
- spitfire_put_dcache_tag(va, 0x0);
- }
- /* Re-enable in LSU. */
- __asm__ __volatile__("flush %%g6nt"
- "membar #Syncnt"
- "stxa %0, [%%g0] %1nt"
- "membar #Sync"
- : /* no outputs */
- : "r" (LSU_CONTROL_IC | LSU_CONTROL_DC |
- LSU_CONTROL_IM | LSU_CONTROL_DM),
- "i" (ASI_LSU_CONTROL)
- : "memory");
- }
- void do_iae(struct pt_regs *regs)
- {
- siginfo_t info;
- spitfire_clean_and_reenable_l1_caches();
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_OBJERR;
- info.si_addr = (void *)0;
- info.si_trapno = 0;
- force_sig_info(SIGBUS, &info, current);
- }
- void do_dae(struct pt_regs *regs)
- {
- #ifdef CONFIG_PCI
- if (pci_poke_in_progress && pci_poke_cpu == smp_processor_id()) {
- spitfire_clean_and_reenable_l1_caches();
- pci_poke_faulted = 1;
- /* Why the fuck did they have to change this? */
- if (tlb_type == cheetah || tlb_type == cheetah_plus)
- regs->tpc += 4;
- regs->tnpc = regs->tpc + 4;
- return;
- }
- #endif
- do_iae(regs);
- }
- static char ecc_syndrome_table[] = {
- 0x4c, 0x40, 0x41, 0x48, 0x42, 0x48, 0x48, 0x49,
- 0x43, 0x48, 0x48, 0x49, 0x48, 0x49, 0x49, 0x4a,
- 0x44, 0x48, 0x48, 0x20, 0x48, 0x39, 0x4b, 0x48,
- 0x48, 0x25, 0x31, 0x48, 0x28, 0x48, 0x48, 0x2c,
- 0x45, 0x48, 0x48, 0x21, 0x48, 0x3d, 0x04, 0x48,
- 0x48, 0x4b, 0x35, 0x48, 0x2d, 0x48, 0x48, 0x29,
- 0x48, 0x00, 0x01, 0x48, 0x0a, 0x48, 0x48, 0x4b,
- 0x0f, 0x48, 0x48, 0x4b, 0x48, 0x49, 0x49, 0x48,
- 0x46, 0x48, 0x48, 0x2a, 0x48, 0x3b, 0x27, 0x48,
- 0x48, 0x4b, 0x33, 0x48, 0x22, 0x48, 0x48, 0x2e,
- 0x48, 0x19, 0x1d, 0x48, 0x1b, 0x4a, 0x48, 0x4b,
- 0x1f, 0x48, 0x4a, 0x4b, 0x48, 0x4b, 0x4b, 0x48,
- 0x48, 0x4b, 0x24, 0x48, 0x07, 0x48, 0x48, 0x36,
- 0x4b, 0x48, 0x48, 0x3e, 0x48, 0x30, 0x38, 0x48,
- 0x49, 0x48, 0x48, 0x4b, 0x48, 0x4b, 0x16, 0x48,
- 0x48, 0x12, 0x4b, 0x48, 0x49, 0x48, 0x48, 0x4b,
- 0x47, 0x48, 0x48, 0x2f, 0x48, 0x3f, 0x4b, 0x48,
- 0x48, 0x06, 0x37, 0x48, 0x23, 0x48, 0x48, 0x2b,
- 0x48, 0x05, 0x4b, 0x48, 0x4b, 0x48, 0x48, 0x32,
- 0x26, 0x48, 0x48, 0x3a, 0x48, 0x34, 0x3c, 0x48,
- 0x48, 0x11, 0x15, 0x48, 0x13, 0x4a, 0x48, 0x4b,
- 0x17, 0x48, 0x4a, 0x4b, 0x48, 0x4b, 0x4b, 0x48,
- 0x49, 0x48, 0x48, 0x4b, 0x48, 0x4b, 0x1e, 0x48,
- 0x48, 0x1a, 0x4b, 0x48, 0x49, 0x48, 0x48, 0x4b,
- 0x48, 0x08, 0x0d, 0x48, 0x02, 0x48, 0x48, 0x49,
- 0x03, 0x48, 0x48, 0x49, 0x48, 0x4b, 0x4b, 0x48,
- 0x49, 0x48, 0x48, 0x49, 0x48, 0x4b, 0x10, 0x48,
- 0x48, 0x14, 0x4b, 0x48, 0x4b, 0x48, 0x48, 0x4b,
- 0x49, 0x48, 0x48, 0x49, 0x48, 0x4b, 0x18, 0x48,
- 0x48, 0x1c, 0x4b, 0x48, 0x4b, 0x48, 0x48, 0x4b,
- 0x4a, 0x0c, 0x09, 0x48, 0x0e, 0x48, 0x48, 0x4b,
- 0x0b, 0x48, 0x48, 0x4b, 0x48, 0x4b, 0x4b, 0x4a
- };
- /* cee_trap in entry.S encodes AFSR/UDBH/UDBL error status
- * in the following format. The AFAR is left as is, with
- * reserved bits cleared, and is a raw 40-bit physical
- * address.
- */
- #define CE_STATUS_UDBH_UE (1UL << (43 + 9))
- #define CE_STATUS_UDBH_CE (1UL << (43 + 8))
- #define CE_STATUS_UDBH_ESYNDR (0xffUL << 43)
- #define CE_STATUS_UDBH_SHIFT 43
- #define CE_STATUS_UDBL_UE (1UL << (33 + 9))
- #define CE_STATUS_UDBL_CE (1UL << (33 + 8))
- #define CE_STATUS_UDBL_ESYNDR (0xffUL << 33)
- #define CE_STATUS_UDBL_SHIFT 33
- #define CE_STATUS_AFSR_MASK (0x1ffffffffUL)
- #define CE_STATUS_AFSR_ME (1UL << 32)
- #define CE_STATUS_AFSR_PRIV (1UL << 31)
- #define CE_STATUS_AFSR_ISAP (1UL << 30)
- #define CE_STATUS_AFSR_ETP (1UL << 29)
- #define CE_STATUS_AFSR_IVUE (1UL << 28)
- #define CE_STATUS_AFSR_TO (1UL << 27)
- #define CE_STATUS_AFSR_BERR (1UL << 26)
- #define CE_STATUS_AFSR_LDP (1UL << 25)
- #define CE_STATUS_AFSR_CP (1UL << 24)
- #define CE_STATUS_AFSR_WP (1UL << 23)
- #define CE_STATUS_AFSR_EDP (1UL << 22)
- #define CE_STATUS_AFSR_UE (1UL << 21)
- #define CE_STATUS_AFSR_CE (1UL << 20)
- #define CE_STATUS_AFSR_ETS (0xfUL << 16)
- #define CE_STATUS_AFSR_ETS_SHIFT 16
- #define CE_STATUS_AFSR_PSYND (0xffffUL << 0)
- #define CE_STATUS_AFSR_PSYND_SHIFT 0
- /* Layout of Ecache TAG Parity Syndrome of AFSR */
- #define AFSR_ETSYNDROME_7_0 0x1UL /* E$-tag bus bits <7:0> */
- #define AFSR_ETSYNDROME_15_8 0x2UL /* E$-tag bus bits <15:8> */
- #define AFSR_ETSYNDROME_21_16 0x4UL /* E$-tag bus bits <21:16> */
- #define AFSR_ETSYNDROME_24_22 0x8UL /* E$-tag bus bits <24:22> */
- static char *syndrome_unknown = "<Unknown>";
- asmlinkage void cee_log(unsigned long ce_status,
- unsigned long afar,
- struct pt_regs *regs)
- {
- char memmod_str[64];
- char *p;
- unsigned short scode, udb_reg;
- printk(KERN_WARNING "CPU[%d]: Correctable ECC Error "
- "AFSR[%lx] AFAR[%016lx] UDBL[%lx] UDBH[%lx]n",
- smp_processor_id(),
- (ce_status & CE_STATUS_AFSR_MASK),
- afar,
- ((ce_status >> CE_STATUS_UDBL_SHIFT) & 0x3ffUL),
- ((ce_status >> CE_STATUS_UDBH_SHIFT) & 0x3ffUL));
- udb_reg = ((ce_status >> CE_STATUS_UDBL_SHIFT) & 0x3ffUL);
- if (udb_reg & (1 << 8)) {
- scode = ecc_syndrome_table[udb_reg & 0xff];
- if (prom_getunumber(scode, afar,
- memmod_str, sizeof(memmod_str)) == -1)
- p = syndrome_unknown;
- else
- p = memmod_str;
- printk(KERN_WARNING "CPU[%d]: UDBL Syndrome[%x] "
- "Memory Module "%s"n",
- smp_processor_id(), scode, p);
- }
- udb_reg = ((ce_status >> CE_STATUS_UDBH_SHIFT) & 0x3ffUL);
- if (udb_reg & (1 << 8)) {
- scode = ecc_syndrome_table[udb_reg & 0xff];
- if (prom_getunumber(scode, afar,
- memmod_str, sizeof(memmod_str)) == -1)
- p = syndrome_unknown;
- else
- p = memmod_str;
- printk(KERN_WARNING "CPU[%d]: UDBH Syndrome[%x] "
- "Memory Module "%s"n",
- smp_processor_id(), scode, p);
- }
- }
- /* Cheetah error trap handling. */
- static unsigned long ecache_flush_physbase;
- static unsigned long ecache_flush_linesize;
- static unsigned long ecache_flush_size;
- /* WARNING: The error trap handlers in assembly know the precise
- * layout of the following structure.
- *
- * C-level handlers below use this information to log the error
- * and then determine how to recover (if possible).
- */
- struct cheetah_err_info {
- /*0x00*/u64 afsr;
- /*0x08*/u64 afar;
- /* D-cache state */
- /*0x10*/u64 dcache_data[4]; /* The actual data */
- /*0x30*/u64 dcache_index; /* D-cache index */
- /*0x38*/u64 dcache_tag; /* D-cache tag/valid */
- /*0x40*/u64 dcache_utag; /* D-cache microtag */
- /*0x48*/u64 dcache_stag; /* D-cache snooptag */
- /* I-cache state */
- /*0x50*/u64 icache_data[8]; /* The actual insns + predecode */
- /*0x90*/u64 icache_index; /* I-cache index */
- /*0x98*/u64 icache_tag; /* I-cache phys tag */
- /*0xa0*/u64 icache_utag; /* I-cache microtag */
- /*0xa8*/u64 icache_stag; /* I-cache snooptag */
- /*0xb0*/u64 icache_upper; /* I-cache upper-tag */
- /*0xb8*/u64 icache_lower; /* I-cache lower-tag */
- /* E-cache state */
- /*0xc0*/u64 ecache_data[4]; /* 32 bytes from staging registers */
- /*0xe0*/u64 ecache_index; /* E-cache index */
- /*0xe8*/u64 ecache_tag; /* E-cache tag/state */
- /*0xf0*/u64 __pad[32 - 30];
- };
- #define CHAFSR_INVALID ((u64)-1L)
- /* This is allocated at boot time based upon the largest hardware
- * cpu ID in the system. We allocate two entries per cpu, one for
- * TL==0 logging and one for TL >= 1 logging.
- */
- struct cheetah_err_info *cheetah_error_log;
- static __inline__ struct cheetah_err_info *cheetah_get_error_log(unsigned long afsr)
- {
- struct cheetah_err_info *p;
- int cpu = smp_processor_id();
- if (!cheetah_error_log)
- return NULL;
- p = cheetah_error_log + (cpu * 2);
- if ((afsr & CHAFSR_TL1) != 0UL)
- p++;
- return p;
- }
- extern unsigned int tl0_icpe[], tl1_icpe[];
- extern unsigned int tl0_dcpe[], tl1_dcpe[];
- extern unsigned int tl0_fecc[], tl1_fecc[];
- extern unsigned int tl0_cee[], tl1_cee[];
- extern unsigned int tl0_iae[], tl1_iae[];
- extern unsigned int tl0_dae[], tl1_dae[];
- extern unsigned int cheetah_plus_icpe_trap_vector[], cheetah_plus_icpe_trap_vector_tl1[];
- extern unsigned int cheetah_plus_dcpe_trap_vector[], cheetah_plus_dcpe_trap_vector_tl1[];
- extern unsigned int cheetah_fecc_trap_vector[], cheetah_fecc_trap_vector_tl1[];
- extern unsigned int cheetah_cee_trap_vector[], cheetah_cee_trap_vector_tl1[];
- extern unsigned int cheetah_deferred_trap_vector[], cheetah_deferred_trap_vector_tl1[];
- void cheetah_ecache_flush_init(void)
- {
- unsigned long largest_size, smallest_linesize, order;
- char type[16];
- int node, highest_cpu, i;
- /* Scan all cpu device tree nodes, note two values:
- * 1) largest E-cache size
- * 2) smallest E-cache line size
- */
- largest_size = 0UL;
- smallest_linesize = ~0UL;
- node = prom_getchild(prom_root_node);
- while ((node = prom_getsibling(node)) != 0) {
- prom_getstring(node, "device_type", type, sizeof(type));
- if (!strcmp(type, "cpu")) {
- unsigned long val;
- val = prom_getintdefault(node, "ecache-size",
- (2 * 1024 * 1024));
- if (val > largest_size)
- largest_size = val;
- val = prom_getintdefault(node, "ecache-line-size", 64);
- if (val < smallest_linesize)
- smallest_linesize = val;
- }
- }
- if (largest_size == 0UL || smallest_linesize == ~0UL) {
- prom_printf("cheetah_ecache_flush_init: Cannot probe cpu E-cache "
- "parameters.n");
- prom_halt();
- }
- ecache_flush_size = (2 * largest_size);
- ecache_flush_linesize = smallest_linesize;
- /* Discover a physically contiguous chunk of physical
- * memory in 'sp_banks' of size ecache_flush_size calculated
- * above. Store the physical base of this area at
- * ecache_flush_physbase.
- */
- for (node = 0; ; node++) {
- if (sp_banks[node].num_bytes == 0)
- break;
- if (sp_banks[node].num_bytes >= ecache_flush_size) {
- ecache_flush_physbase = sp_banks[node].base_addr;
- break;
- }
- }
- /* Note: Zero would be a valid value of ecache_flush_physbase so
- * don't use that as the success test. :-)
- */
- if (sp_banks[node].num_bytes == 0) {
- prom_printf("cheetah_ecache_flush_init: Cannot find %d byte "
- "contiguous physical memory.n", ecache_flush_size);
- prom_halt();
- }
- /* Now allocate error trap reporting scoreboard. */
- highest_cpu = 0;
- #ifdef CONFIG_SMP
- for (i = 0; i < NR_CPUS; i++) {
- if ((1UL << i) & cpu_present_map)
- highest_cpu = i;
- }
- #endif
- highest_cpu++;
- node = highest_cpu * (2 * sizeof(struct cheetah_err_info));
- for (order = 0; order < MAX_ORDER; order++) {
- if ((PAGE_SIZE << order) >= node)
- break;
- }
- cheetah_error_log = (struct cheetah_err_info *)
- __get_free_pages(GFP_KERNEL, order);
- if (!cheetah_error_log) {
- prom_printf("cheetah_ecache_flush_init: Failed to allocate "
- "error logging scoreboard (%d bytes).n", node);
- prom_halt();
- }
- memset(cheetah_error_log, 0, PAGE_SIZE << order);
- /* Mark all AFSRs as invalid so that the trap handler will
- * log new new information there.
- */
- for (i = 0; i < 2 * highest_cpu; i++)
- cheetah_error_log[i].afsr = CHAFSR_INVALID;
- /* Now patch trap tables. */
- memcpy(tl0_fecc, cheetah_fecc_trap_vector, (8 * 4));
- memcpy(tl1_fecc, cheetah_fecc_trap_vector_tl1, (8 * 4));
- memcpy(tl0_cee, cheetah_cee_trap_vector, (8 * 4));
- memcpy(tl1_cee, cheetah_cee_trap_vector_tl1, (8 * 4));
- memcpy(tl0_iae, cheetah_deferred_trap_vector, (8 * 4));
- memcpy(tl1_iae, cheetah_deferred_trap_vector_tl1, (8 * 4));
- memcpy(tl0_dae, cheetah_deferred_trap_vector, (8 * 4));
- memcpy(tl1_dae, cheetah_deferred_trap_vector_tl1, (8 * 4));
- if (tlb_type == cheetah_plus) {
- memcpy(tl0_dcpe, cheetah_plus_dcpe_trap_vector, (8 * 4));
- memcpy(tl1_dcpe, cheetah_plus_dcpe_trap_vector_tl1, (8 * 4));
- memcpy(tl0_icpe, cheetah_plus_icpe_trap_vector, (8 * 4));
- memcpy(tl1_icpe, cheetah_plus_icpe_trap_vector_tl1, (8 * 4));
- }
- flushi(PAGE_OFFSET);
- }
- static void cheetah_flush_ecache(void)
- {
- unsigned long flush_base = ecache_flush_physbase;
- unsigned long flush_linesize = ecache_flush_linesize;
- unsigned long flush_size = ecache_flush_size;
- __asm__ __volatile__("1: subcc %0, %4, %0nt"
- " bne,pt %%xcc, 1bnt"
- " ldxa [%2 + %0] %3, %%g0nt"
- : "=&r" (flush_size)
- : "0" (flush_size), "r" (flush_base),
- "i" (ASI_PHYS_USE_EC), "r" (flush_linesize));
- }
- static void cheetah_flush_ecache_line(unsigned long physaddr)
- {
- unsigned long alias;
- physaddr &= ~(8UL - 1UL);
- physaddr = (ecache_flush_physbase +
- (physaddr & ((ecache_flush_size>>1UL) - 1UL)));
- alias = physaddr + (ecache_flush_size >> 1UL);
- __asm__ __volatile__("ldxa [%0] %2, %%g0nt"
- "ldxa [%1] %2, %%g0nt"
- "membar #Sync"
- : /* no outputs */
- : "r" (physaddr), "r" (alias),
- "i" (ASI_PHYS_USE_EC));
- }
- /* Unfortunately, the diagnostic access to the I-cache tags we need to
- * use to clear the thing interferes with I-cache coherency transactions.
- *
- * So we must only flush the I-cache when it is disabled.
- */
- static void __cheetah_flush_icache(void)
- {
- unsigned long i;
- /* Clear the valid bits in all the tags. */
- for (i = 0; i < (1 << 15); i += (1 << 5)) {
- __asm__ __volatile__("stxa %%g0, [%0] %1nt"
- "membar #Sync"
- : /* no outputs */
- : "r" (i | (2 << 3)), "i" (ASI_IC_TAG));
- }
- }
- static void cheetah_flush_icache(void)
- {
- unsigned long dcu_save;
- /* Save current DCU, disable I-cache. */
- __asm__ __volatile__("ldxa [%%g0] %1, %0nt"
- "or %0, %2, %%g1nt"
- "stxa %%g1, [%%g0] %1nt"
- "membar #Sync"
- : "=r" (dcu_save)
- : "i" (ASI_DCU_CONTROL_REG), "i" (DCU_IC)
- : "g1");
- __cheetah_flush_icache();
- /* Restore DCU register */
- __asm__ __volatile__("stxa %0, [%%g0] %1nt"
- "membar #Sync"
- : /* no outputs */
- : "r" (dcu_save), "i" (ASI_DCU_CONTROL_REG));
- }
- static void cheetah_flush_dcache(void)
- {
- unsigned long i;
- for (i = 0; i < (1 << 16); i += (1 << 5)) {
- __asm__ __volatile__("stxa %%g0, [%0] %1nt"
- "membar #Sync"
- : /* no outputs */
- : "r" (i), "i" (ASI_DCACHE_TAG));
- }
- }
- /* In order to make the even parity correct we must do two things.
- * First, we clear DC_data_parity and set DC_utag to an appropriate value.
- * Next, we clear out all 32-bytes of data for that line. Data of
- * all-zero + tag parity value of zero == correct parity.
- */
- static void cheetah_plus_zap_dcache_parity(void)
- {
- unsigned long i;
- for (i = 0; i < (1 << 16); i += (1 << 5)) {
- unsigned long tag = (i >> 14);
- unsigned long j;
- __asm__ __volatile__("membar #Syncnt"
- "stxa %0, [%1] %2nt"
- "membar #Sync"
- : /* no outputs */
- : "r" (tag), "r" (i),
- "i" (ASI_DCACHE_UTAG));
- for (j = i; j < i + (1 << 5); j += (1 << 3))
- __asm__ __volatile__("membar #Syncnt"
- "stxa %%g0, [%0] %1nt"
- "membar #Sync"
- : /* no outputs */
- : "r" (j), "i" (ASI_DCACHE_DATA));
- }
- }
- /* Conversion tables used to frob Cheetah AFSR syndrome values into
- * something palatable to the memory controller driver get_unumber
- * routine.
- */
- #define MT0 137
- #define MT1 138
- #define MT2 139
- #define NONE 254
- #define MTC0 140
- #define MTC1 141
- #define MTC2 142
- #define MTC3 143
- #define C0 128
- #define C1 129
- #define C2 130
- #define C3 131
- #define C4 132
- #define C5 133
- #define C6 134
- #define C7 135
- #define C8 136
- #define M2 144
- #define M3 145
- #define M4 146
- #define M 147
- static unsigned char cheetah_ecc_syntab[] = {
- /*00*/NONE, C0, C1, M2, C2, M2, M3, 47, C3, M2, M2, 53, M2, 41, 29, M,
- /*01*/C4, M, M, 50, M2, 38, 25, M2, M2, 33, 24, M2, 11, M, M2, 16,
- /*02*/C5, M, M, 46, M2, 37, 19, M2, M, 31, 32, M, 7, M2, M2, 10,
- /*03*/M2, 40, 13, M2, 59, M, M2, 66, M, M2, M2, 0, M2, 67, 71, M,
- /*04*/C6, M, M, 43, M, 36, 18, M, M2, 49, 15, M, 63, M2, M2, 6,
- /*05*/M2, 44, 28, M2, M, M2, M2, 52, 68, M2, M2, 62, M2, M3, M3, M4,
- /*06*/M2, 26, 106, M2, 64, M, M2, 2, 120, M, M2, M3, M, M3, M3, M4,
- /*07*/116, M2, M2, M3, M2, M3, M, M4, M2, 58, 54, M2, M, M4, M4, M3,
- /*08*/C7, M2, M, 42, M, 35, 17, M2, M, 45, 14, M2, 21, M2, M2, 5,
- /*09*/M, 27, M, M, 99, M, M, 3, 114, M2, M2, 20, M2, M3, M3, M,
- /*0a*/M2, 23, 113, M2, 112, M2, M, 51, 95, M, M2, M3, M2, M3, M3, M2,
- /*0b*/103, M, M2, M3, M2, M3, M3, M4, M2, 48, M, M, 73, M2, M, M3,
- /*0c*/M2, 22, 110, M2, 109, M2, M, 9, 108, M2, M, M3, M2, M3, M3, M,
- /*0d*/102, M2, M, M, M2, M3, M3, M, M2, M3, M3, M2, M, M4, M, M3,
- /*0e*/98, M, M2, M3, M2, M, M3, M4, M2, M3, M3, M4, M3, M, M, M,
- /*0f*/M2, M3, M3, M, M3, M, M, M, 56, M4, M, M3, M4, M, M, M,
- /*10*/C8, M, M2, 39, M, 34, 105, M2, M, 30, 104, M, 101, M, M, 4,
- /*11*/M, M, 100, M, 83, M, M2, 12, 87, M, M, 57, M2, M, M3, M,
- /*12*/M2, 97, 82, M2, 78, M2, M2, 1, 96, M, M, M, M, M, M3, M2,
- /*13*/94, M, M2, M3, M2, M, M3, M, M2, M, 79, M, 69, M, M4, M,
- /*14*/M2, 93, 92, M, 91, M, M2, 8, 90, M2, M2, M, M, M, M, M4,
- /*15*/89, M, M, M3, M2, M3, M3, M, M, M, M3, M2, M3, M2, M, M3,
- /*16*/86, M, M2, M3, M2, M, M3, M, M2, M, M3, M, M3, M, M, M3,
- /*17*/M, M, M3, M2, M3, M2, M4, M, 60, M, M2, M3, M4, M, M, M2,
- /*18*/M2, 88, 85, M2, 84, M, M2, 55, 81, M2, M2, M3, M2, M3, M3, M4,
- /*19*/77, M, M, M, M2, M3, M, M, M2, M3, M3, M4, M3, M2, M, M,
- /*1a*/74, M, M2, M3, M, M, M3, M, M, M, M3, M, M3, M, M4, M3,
- /*1b*/M2, 70, 107, M4, 65, M2, M2, M, 127, M, M, M, M2, M3, M3, M,
- /*1c*/80, M2, M2, 72, M, 119, 118, M, M2, 126, 76, M, 125, M, M4, M3,
- /*1d*/M2, 115, 124, M, 75, M, M, M3, 61, M, M4, M, M4, M, M, M,
- /*1e*/M, 123, 122, M4, 121, M4, M, M3, 117, M2, M2, M3, M4, M3, M, M,
- /*1f*/111, M, M, M, M4, M3, M3, M, M, M, M3, M, M3, M2, M, M
- };
- static unsigned char cheetah_mtag_syntab[] = {
- NONE, MTC0,
- MTC1, NONE,
- MTC2, NONE,
- NONE, MT0,
- MTC3, NONE,
- NONE, MT1,
- NONE, MT2,
- NONE, NONE
- };
- /* This table is ordered in priority of errors and matches the
- * AFAR overwrite policy as well.
- */
- static struct {
- unsigned long mask;
- char *name;
- } cheetah_error_table[] = {
- { CHAFSR_PERR, "System interface protocol error" },
- { CHAFSR_IERR, "Internal processor error" },
- { CHAFSR_ISAP, "System request parity error on incoming addresss" },
- { CHAFSR_UCU, "Uncorrectable E-cache ECC error for ifetch/data" },
- { CHAFSR_UCC, "SW Correctable E-cache ECC error for ifetch/data" },
- { CHAFSR_UE, "Uncorrectable system bus data ECC error for read" },
- { CHAFSR_EDU, "Uncorrectable E-cache ECC error for stmerge/blkld" },
- { CHAFSR_EMU, "Uncorrectable system bus MTAG error" },
- { CHAFSR_WDU, "Uncorrectable E-cache ECC error for writeback" },
- { CHAFSR_CPU, "Uncorrectable ECC error for copyout" },
- { CHAFSR_CE, "HW corrected system bus data ECC error for read" },
- { CHAFSR_EDC, "HW corrected E-cache ECC error for stmerge/blkld" },
- { CHAFSR_EMC, "HW corrected system bus MTAG ECC error" },
- { CHAFSR_WDC, "HW corrected E-cache ECC error for writeback" },
- { CHAFSR_CPC, "HW corrected ECC error for copyout" },
- { CHAFSR_TO, "Unmapped error from system bus" },
- { CHAFSR_BERR, "Bus error response from system bus" },
- /* These two do not update the AFAR. */
- { CHAFSR_IVC, "HW corrected system bus data ECC error for ivec read" },
- { CHAFSR_IVU, "Uncorrectable system bus data ECC error for ivec read" },
- { 0, NULL }
- };
- /* Return the highest priority error conditon mentioned. */
- static __inline__ unsigned long cheetah_get_hipri(unsigned long afsr)
- {
- unsigned long tmp = 0;
- int i;
- for (i = 0; cheetah_error_table[i].mask; i++) {
- if ((tmp = (afsr & cheetah_error_table[i].mask)) != 0UL)
- return tmp;
- }
- return tmp;
- }
- static char *cheetah_get_string(unsigned long bit)
- {
- int i;
- for (i = 0; cheetah_error_table[i].mask; i++) {
- if ((bit & cheetah_error_table[i].mask) != 0UL)
- return cheetah_error_table[i].name;
- }
- return "???";
- }
- extern int chmc_getunumber(int, unsigned long, char *, int);
- static void cheetah_log_errors(struct pt_regs *regs, struct cheetah_err_info *info,
- unsigned long afsr, unsigned long afar, int recoverable)
- {
- unsigned long hipri;
- char unum[256];
- printk("%s" "ERROR(%d): Cheetah error trap taken afsr[%016lx] afar[%016lx] TL1(%d)n",
- (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
- afsr, afar,
- (afsr & CHAFSR_TL1) ? 1 : 0);
- printk("%s" "ERROR(%d): TPC[%016lx] TNPC[%016lx] TSTATE[%016lx]n",
- (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
- regs->tpc, regs->tnpc, regs->tstate);
- printk("%s" "ERROR(%d): M_SYND(%lx), E_SYND(%lx)%s%sn",
- (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
- (afsr & CHAFSR_M_SYNDROME) >> CHAFSR_M_SYNDROME_SHIFT,
- (afsr & CHAFSR_E_SYNDROME) >> CHAFSR_E_SYNDROME_SHIFT,
- (afsr & CHAFSR_ME) ? ", Multiple Errors" : "",
- (afsr & CHAFSR_PRIV) ? ", Privileged" : "");
- hipri = cheetah_get_hipri(afsr);
- printk("%s" "ERROR(%d): Highest priority error (%016lx) "%s"n",
- (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
- hipri, cheetah_get_string(hipri));
- /* Try to get unumber if relevant. */
- #define ESYND_ERRORS (CHAFSR_IVC | CHAFSR_IVU |
- CHAFSR_CPC | CHAFSR_CPU |
- CHAFSR_UE | CHAFSR_CE |
- CHAFSR_EDC | CHAFSR_EDU |
- CHAFSR_UCC | CHAFSR_UCU |
- CHAFSR_WDU | CHAFSR_WDC)
- #define MSYND_ERRORS (CHAFSR_EMC | CHAFSR_EMU)
- if (afsr & ESYND_ERRORS) {
- int syndrome;
- int ret;
- syndrome = (afsr & CHAFSR_E_SYNDROME) >> CHAFSR_E_SYNDROME_SHIFT;
- syndrome = cheetah_ecc_syntab[syndrome];
- ret = chmc_getunumber(syndrome, afar, unum, sizeof(unum));
- if (ret != -1)
- printk("%s" "ERROR(%d): AFAR E-syndrome [%s]n",
- (recoverable ? KERN_WARNING : KERN_CRIT),
- smp_processor_id(), unum);
- } else if (afsr & MSYND_ERRORS) {
- int syndrome;
- int ret;
- syndrome = (afsr & CHAFSR_M_SYNDROME) >> CHAFSR_M_SYNDROME_SHIFT;
- syndrome = cheetah_mtag_syntab[syndrome];
- ret = chmc_getunumber(syndrome, afar, unum, sizeof(unum));
- if (ret != -1)
- printk("%s" "ERROR(%d): AFAR M-syndrome [%s]n",
- (recoverable ? KERN_WARNING : KERN_CRIT),
- smp_processor_id(), unum);
- }
- /* Now dump the cache snapshots. */
- printk("%s" "ERROR(%d): D-cache idx[%x] tag[%016lx] utag[%016lx] stag[%016lx]n",
- (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
- (int) info->dcache_index,
- info->dcache_tag,
- info->dcache_utag,
- info->dcache_stag);
- printk("%s" "ERROR(%d): D-cache data0[%016lx] data1[%016lx] data2[%016lx] data3[%016lx]n",
- (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
- info->dcache_data[0],
- info->dcache_data[1],
- info->dcache_data[2],
- info->dcache_data[3]);
- printk("%s" "ERROR(%d): I-cache idx[%x] tag[%016lx] utag[%016lx] stag[%016lx] "
- "u[%016lx] l[%016lx]n",
- (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
- (int) info->icache_index,
- info->icache_tag,
- info->icache_utag,
- info->icache_stag,
- info->icache_upper,
- info->icache_lower);
- printk("%s" "ERROR(%d): I-cache INSN0[%016lx] INSN1[%016lx] INSN2[%016lx] INSN3[%016lx]n",
- (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
- info->icache_data[0],
- info->icache_data[1],
- info->icache_data[2],
- info->icache_data[3]);
- printk("%s" "ERROR(%d): I-cache INSN4[%016lx] INSN5[%016lx] INSN6[%016lx] INSN7[%016lx]n",
- (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
- info->icache_data[4],
- info->icache_data[5],
- info->icache_data[6],
- info->icache_data[7]);
- printk("%s" "ERROR(%d): E-cache idx[%x] tag[%016lx]n",
- (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
- (int) info->ecache_index, info->ecache_tag);
- printk("%s" "ERROR(%d): E-cache data0[%016lx] data1[%016lx] data2[%016lx] data3[%016lx]n",
- (recoverable ? KERN_WARNING : KERN_CRIT), smp_processor_id(),
- info->ecache_data[0],
- info->ecache_data[1],
- info->ecache_data[2],
- info->ecache_data[3]);
- afsr = (afsr & ~hipri) & CHAFSR_ERRORS;
- while (afsr != 0UL) {
- unsigned long bit = cheetah_get_hipri(afsr);
- printk("%s" "ERROR: Multiple-error (%016lx) "%s"n",
- (recoverable ? KERN_WARNING : KERN_CRIT),
- bit, cheetah_get_string(bit));
- afsr &= ~bit;
- }
- if (!recoverable)
- printk(KERN_CRIT "ERROR: This condition is not recoverable.n");
- }
- static int cheetah_recheck_errors(struct cheetah_err_info *logp)
- {
- unsigned long afsr, afar;
- int ret = 0;
- __asm__ __volatile__("ldxa [%%g0] %1, %0nt"
- : "=r" (afsr)
- : "i" (ASI_AFSR));
- if ((afsr & CHAFSR_ERRORS) != 0) {
- if (logp != NULL) {
- __asm__ __volatile__("ldxa [%%g0] %1, %0nt"
- : "=r" (afar)
- : "i" (ASI_AFAR));
- logp->afsr = afsr;
- logp->afar = afar;
- }
- ret = 1;
- }
- __asm__ __volatile__("stxa %0, [%%g0] %1nt"
- "membar #Syncnt"
- : : "r" (afsr), "i" (ASI_AFSR));
- return ret;
- }
- void cheetah_fecc_handler(struct pt_regs *regs, unsigned long afsr, unsigned long afar)
- {
- struct cheetah_err_info local_snapshot, *p;
- int recoverable;
- /* Flush E-cache */
- cheetah_flush_ecache();
- p = cheetah_get_error_log(afsr);
- if (!p) {
- prom_printf("ERROR: Early Fast-ECC error afsr[%016lx] afar[%016lx]n",
- afsr, afar);
- prom_printf("ERROR: CPU(%d) TPC[%016lx] TNPC[%016lx] TSTATE[%016lx]n",
- smp_processor_id(), regs->tpc, regs->tnpc, regs->tstate);
- prom_halt();
- }
- /* Grab snapshot of logged error. */
- memcpy(&local_snapshot, p, sizeof(local_snapshot));
- /* If the current trap snapshot does not match what the
- * trap handler passed along into our args, big trouble.
- * In such a case, mark the local copy as invalid.
- *
- * Else, it matches and we mark the afsr in the non-local
- * copy as invalid so we may log new error traps there.
- */
- if (p->afsr != afsr || p->afar != afar)
- local_snapshot.afsr = CHAFSR_INVALID;
- else
- p->afsr = CHAFSR_INVALID;
- cheetah_flush_icache();
- cheetah_flush_dcache();
- /* Re-enable I-cache/D-cache */
- __asm__ __volatile__("ldxa [%%g0] %0, %%g1nt"
- "or %%g1, %1, %%g1nt"
- "stxa %%g1, [%%g0] %0nt"
- "membar #Sync"
- : /* no outputs */
- : "i" (ASI_DCU_CONTROL_REG),
- "i" (DCU_DC | DCU_IC)
- : "g1");
- /* Re-enable error reporting */
- __asm__ __volatile__("ldxa [%%g0] %0, %%g1nt"
- "or %%g1, %1, %%g1nt"
- "stxa %%g1, [%%g0] %0nt"
- "membar #Sync"
- : /* no outputs */
- : "i" (ASI_ESTATE_ERROR_EN),
- "i" (ESTATE_ERROR_NCEEN | ESTATE_ERROR_CEEN)
- : "g1");
- /* Decide if we can continue after handling this trap and
- * logging the error.
- */
- recoverable = 1;
- if (afsr & (CHAFSR_PERR | CHAFSR_IERR | CHAFSR_ISAP))
- recoverable = 0;
- /* Re-check AFSR/AFAR. What we are looking for here is whether a new
- * error was logged while we had error reporting traps disabled.
- */
- if (cheetah_recheck_errors(&local_snapshot)) {
- unsigned long new_afsr = local_snapshot.afsr;
- /* If we got a new asynchronous error, die... */
- if (new_afsr & (CHAFSR_EMU | CHAFSR_EDU |
- CHAFSR_WDU | CHAFSR_CPU |
- CHAFSR_IVU | CHAFSR_UE |
- CHAFSR_BERR | CHAFSR_TO))
- recoverable = 0;
- }
- /* Log errors. */
- cheetah_log_errors(regs, &local_snapshot, afsr, afar, recoverable);
- if (!recoverable)
- panic("Irrecoverable Fast-ECC error trap.n");
- /* Flush E-cache to kick the error trap handlers out. */
- cheetah_flush_ecache();
- }
- /* Try to fix a correctable error by pushing the line out from
- * the E-cache. Recheck error reporting registers to see if the
- * problem is intermittent.
- */
- static int cheetah_fix_ce(unsigned long physaddr)
- {
- unsigned long orig_estate;
- unsigned long alias1, alias2;
- int ret;
- /* Make sure correctable error traps are disabled. */
- __asm__ __volatile__("ldxa [%%g0] %2, %0nt"
- "andn %0, %1, %%g1nt"
- "stxa %%g1, [%%g0] %2nt"
- "membar #Sync"
- : "=&r" (orig_estate)
- : "i" (ESTATE_ERROR_CEEN),
- "i" (ASI_ESTATE_ERROR_EN)
- : "g1");
- /* We calculate alias addresses that will force the
- * cache line in question out of the E-cache. Then
- * we bring it back in with an atomic instruction so
- * that we get it in some modified/exclusive state,
- * then we displace it again to try and get proper ECC
- * pushed back into the system.
- */
- physaddr &= ~(8UL - 1UL);
- alias1 = (ecache_flush_physbase +
- (physaddr & ((ecache_flush_size >> 1) - 1)));
- alias2 = alias1 + (ecache_flush_size >> 1);
- __asm__ __volatile__("ldxa [%0] %3, %%g0nt"
- "ldxa [%1] %3, %%g0nt"
- "casxa [%2] %3, %%g0, %%g0nt"
- "membar #StoreLoad | #StoreStorent"
- "ldxa [%0] %3, %%g0nt"
- "ldxa [%1] %3, %%g0nt"
- "membar #Sync"
- : /* no outputs */
- : "r" (alias1), "r" (alias2),
- "r" (physaddr), "i" (ASI_PHYS_USE_EC));
- /* Did that trigger another error? */
- if (cheetah_recheck_errors(NULL)) {
- /* Try one more time. */
- __asm__ __volatile__("ldxa [%0] %1, %%g0nt"
- "membar #Sync"
- : : "r" (physaddr), "i" (ASI_PHYS_USE_EC));
- if (cheetah_recheck_errors(NULL))
- ret = 2;
- else
- ret = 1;
- } else {
- /* No new error, intermittent problem. */
- ret = 0;
- }
- /* Restore error enables. */
- __asm__ __volatile__("stxa %0, [%%g0] %1nt"
- "membar #Sync"
- : : "r" (orig_estate), "i" (ASI_ESTATE_ERROR_EN));
- return ret;
- }
- /* Return non-zero if PADDR is a valid physical memory address. */
- static int cheetah_check_main_memory(unsigned long paddr)
- {
- int i;
- for (i = 0; ; i++) {
- if (sp_banks[i].num_bytes == 0)
- break;
- if (paddr >= sp_banks[i].base_addr &&
- paddr < (sp_banks[i].base_addr + sp_banks[i].num_bytes))
- return 1;
- }
- return 0;
- }
- void cheetah_cee_handler(struct pt_regs *regs, unsigned long afsr, unsigned long afar)
- {
- struct cheetah_err_info local_snapshot, *p;
- int recoverable, is_memory;
- p = cheetah_get_error_log(afsr);
- if (!p) {
- prom_printf("ERROR: Early CEE error afsr[%016lx] afar[%016lx]n",
- afsr, afar);
- prom_printf("ERROR: CPU(%d) TPC[%016lx] TNPC[%016lx] TSTATE[%016lx]n",
- smp_processor_id(), regs->tpc, regs->tnpc, regs->tstate);
- prom_halt();
- }
- /* Grab snapshot of logged error. */
- memcpy(&local_snapshot, p, sizeof(local_snapshot));
- /* If the current trap snapshot does not match what the
- * trap handler passed along into our args, big trouble.
- * In such a case, mark the local copy as invalid.
- *
- * Else, it matches and we mark the afsr in the non-local
- * copy as invalid so we may log new error traps there.
- */
- if (p->afsr != afsr || p->afar != afar)
- local_snapshot.afsr = CHAFSR_INVALID;
- else
- p->afsr = CHAFSR_INVALID;
- is_memory = cheetah_check_main_memory(afar);
- if (is_memory && (afsr & CHAFSR_CE) != 0UL) {
- /* XXX Might want to log the results of this operation
- * XXX somewhere... -DaveM
- */
- cheetah_fix_ce(afar);
- }
- {
- int flush_all, flush_line;
- flush_all = flush_line = 0;
- if ((afsr & CHAFSR_EDC) != 0UL) {
- if ((afsr & CHAFSR_ERRORS) == CHAFSR_EDC)
- flush_line = 1;
- else
- flush_all = 1;
- } else if ((afsr & CHAFSR_CPC) != 0UL) {
- if ((afsr & CHAFSR_ERRORS) == CHAFSR_CPC)
- flush_line = 1;
- else
- flush_all = 1;
- }
- /* Trap handler only disabled I-cache, flush it. */
- cheetah_flush_icache();
- /* Re-enable I-cache */
- __asm__ __volatile__("ldxa [%%g0] %0, %%g1nt"
- "or %%g1, %1, %%g1nt"
- "stxa %%g1, [%%g0] %0nt"
- "membar #Sync"
- : /* no outputs */
- : "i" (ASI_DCU_CONTROL_REG),
- "i" (DCU_IC)
- : "g1");
- if (flush_all)
- cheetah_flush_ecache();
- else if (flush_line)
- cheetah_flush_ecache_line(afar);
- }
- /* Re-enable error reporting */
- __asm__ __volatile__("ldxa [%%g0] %0, %%g1nt"
- "or %%g1, %1, %%g1nt"
- "stxa %%g1, [%%g0] %0nt"
- "membar #Sync"
- : /* no outputs */
- : "i" (ASI_ESTATE_ERROR_EN),
- "i" (ESTATE_ERROR_CEEN)
- : "g1");
- /* Decide if we can continue after handling this trap and
- * logging the error.
- */
- recoverable = 1;
- if (afsr & (CHAFSR_PERR | CHAFSR_IERR | CHAFSR_ISAP))
- recoverable = 0;
- /* Re-check AFSR/AFAR */
- (void) cheetah_recheck_errors(&local_snapshot);
- /* Log errors. */
- cheetah_log_errors(regs, &local_snapshot, afsr, afar, recoverable);
- if (!recoverable)
- panic("Irrecoverable Correctable-ECC error trap.n");
- }
- void cheetah_deferred_handler(struct pt_regs *regs, unsigned long afsr, unsigned long afar)
- {
- struct cheetah_err_info local_snapshot, *p;
- int recoverable, is_memory;
- #ifdef CONFIG_PCI
- /* Check for the special PCI poke sequence. */
- if (pci_poke_in_progress && pci_poke_cpu == smp_processor_id()) {
- cheetah_flush_icache();
- cheetah_flush_dcache();
- /* Re-enable I-cache/D-cache */
- __asm__ __volatile__("ldxa [%%g0] %0, %%g1nt"
- "or %%g1, %1, %%g1nt"
- "stxa %%g1, [%%g0] %0nt"
- "membar #Sync"
- : /* no outputs */
- : "i" (ASI_DCU_CONTROL_REG),
- "i" (DCU_DC | DCU_IC)
- : "g1");
- /* Re-enable error reporting */
- __asm__ __volatile__("ldxa [%%g0] %0, %%g1nt"
- "or %%g1, %1, %%g1nt"
- "stxa %%g1, [%%g0] %0nt"
- "membar #Sync"
- : /* no outputs */
- : "i" (ASI_ESTATE_ERROR_EN),
- "i" (ESTATE_ERROR_NCEEN | ESTATE_ERROR_CEEN)
- : "g1");
- (void) cheetah_recheck_errors(NULL);
- pci_poke_faulted = 1;
- regs->tpc += 4;
- regs->tnpc = regs->tpc + 4;
- return;
- }
- #endif
- p = cheetah_get_error_log(afsr);
- if (!p) {
- prom_printf("ERROR: Early deferred error afsr[%016lx] afar[%016lx]n",
- afsr, afar);
- prom_printf("ERROR: CPU(%d) TPC[%016lx] TNPC[%016lx] TSTATE[%016lx]n",
- smp_processor_id(), regs->tpc, regs->tnpc, regs->tstate);
- prom_halt();
- }
- /* Grab snapshot of logged error. */
- memcpy(&local_snapshot, p, sizeof(local_snapshot));
- /* If the current trap snapshot does not match what the
- * trap handler passed along into our args, big trouble.
- * In such a case, mark the local copy as invalid.
- *
- * Else, it matches and we mark the afsr in the non-local
- * copy as invalid so we may log new error traps there.
- */
- if (p->afsr != afsr || p->afar != afar)
- local_snapshot.afsr = CHAFSR_INVALID;
- else
- p->afsr = CHAFSR_INVALID;
- is_memory = cheetah_check_main_memory(afar);
- {
- int flush_all, flush_line;
- flush_all = flush_line = 0;
- if ((afsr & CHAFSR_EDU) != 0UL) {
- if ((afsr & CHAFSR_ERRORS) == CHAFSR_EDU)
- flush_line = 1;
- else
- flush_all = 1;
- } else if ((afsr & CHAFSR_BERR) != 0UL) {
- if ((afsr & CHAFSR_ERRORS) == CHAFSR_BERR)
- flush_line = 1;
- else
- flush_all = 1;
- }
- cheetah_flush_icache();
- cheetah_flush_dcache();
- /* Re-enable I/D caches */
- __asm__ __volatile__("ldxa [%%g0] %0, %%g1nt"
- "or %%g1, %1, %%g1nt"
- "stxa %%g1, [%%g0] %0nt"
- "membar #Sync"
- : /* no outputs */
- : "i" (ASI_DCU_CONTROL_REG),
- "i" (DCU_IC | DCU_DC)
- : "g1");
- if (flush_all)
- cheetah_flush_ecache();
- else if (flush_line)
- cheetah_flush_ecache_line(afar);
- }
- /* Re-enable error reporting */
- __asm__ __volatile__("ldxa [%%g0] %0, %%g1nt"
- "or %%g1, %1, %%g1nt"
- "stxa %%g1, [%%g0] %0nt"
- "membar #Sync"
- : /* no outputs */
- : "i" (ASI_ESTATE_ERROR_EN),
- "i" (ESTATE_ERROR_NCEEN | ESTATE_ERROR_CEEN)
- : "g1");
- /* Decide if we can continue after handling this trap and
- * logging the error.
- */
- recoverable = 1;
- if (afsr & (CHAFSR_PERR | CHAFSR_IERR | CHAFSR_ISAP))
- recoverable = 0;
- /* Re-check AFSR/AFAR. What we are looking for here is whether a new
- * error was logged while we had error reporting traps disabled.
- */
- if (cheetah_recheck_errors(&local_snapshot)) {
- unsigned long new_afsr = local_snapshot.afsr;
- /* If we got a new asynchronous error, die... */
- if (new_afsr & (CHAFSR_EMU | CHAFSR_EDU |
- CHAFSR_WDU | CHAFSR_CPU |
- CHAFSR_IVU | CHAFSR_UE |
- CHAFSR_BERR | CHAFSR_TO))
- recoverable = 0;
- }
- /* Log errors. */
- cheetah_log_errors(regs, &local_snapshot, afsr, afar, recoverable);
- /* "Recoverable" here means we try to yank the page from ever
- * being newly used again. This depends upon a few things:
- * 1) Must be main memory, and AFAR must be valid.
- * 2) If we trapped from use, OK.
- * 3) Else, if we trapped from kernel we must find exception
- * table entry (ie. we have to have been accessing user
- * space).
- *
- * If AFAR is not in main memory, or we trapped from kernel
- * and cannot find an exception table entry, it is unacceptable
- * to try and continue.
- */
- if (recoverable && is_memory) {
- if ((regs->tstate & TSTATE_PRIV) == 0UL) {
- /* OK, usermode access. */
- recoverable = 1;
- } else {
- unsigned long g2 = regs->u_regs[UREG_G2];
- unsigned long fixup = search_exception_table(regs->tpc, &g2);
- if (fixup != 0UL) {
- /* OK, kernel access to userspace. */
- recoverable = 1;
- } else {
- /* BAD, privileged state is corrupted. */
- recoverable = 0;
- }
- if (recoverable) {
- struct page *page = virt_to_page(__va(afar));
- if (VALID_PAGE(page))
- get_page(page);
- else
- recoverable = 0;
- /* Only perform fixup if we still have a
- * recoverable condition.
- */
- if (fixup != 0UL && recoverable) {
- regs->tpc = fixup;
- regs->tnpc = regs->tpc + 4;
- regs->u_regs[UREG_G2] = g2;
- }
- }
- }
- } else {
- recoverable = 0;
- }
- if (!recoverable)
- panic("Irrecoverable deferred error trap.n");
- }
- /* Handle a D/I cache parity error trap. TYPE is encoded as:
- *
- * Bit0: 0=dcache,1=icache
- * Bit1: 0=recoverable,1=unrecoverable
- *
- * The hardware has disabled both the I-cache and D-cache in
- * the %dcr register.
- */
- void cheetah_plus_parity_error(int type, struct pt_regs *regs)
- {
- if (type & 0x1)
- __cheetah_flush_icache();
- else
- cheetah_plus_zap_dcache_parity();
- cheetah_flush_dcache();
- /* Re-enable I-cache/D-cache */
- __asm__ __volatile__("ldxa [%%g0] %0, %%g1nt"
- "or %%g1, %1, %%g1nt"
- "stxa %%g1, [%%g0] %0nt"
- "membar #Sync"
- : /* no outputs */
- : "i" (ASI_DCU_CONTROL_REG),
- "i" (DCU_DC | DCU_IC)
- : "g1");
- if (type & 0x2) {
- printk(KERN_EMERG "CPU[%d]: Cheetah+ %c-cache parity error at TPC[%016lx]n",
- smp_processor_id(),
- (type & 0x1) ? 'I' : 'D',
- regs->tpc);
- panic("Irrecoverable Cheetah+ parity error.");
- }
- printk(KERN_WARNING "CPU[%d]: Cheetah+ %c-cache parity error at TPC[%016lx]n",
- smp_processor_id(),
- (type & 0x1) ? 'I' : 'D',
- regs->tpc);
- }
- void do_fpe_common(struct pt_regs *regs)
- {
- if(regs->tstate & TSTATE_PRIV) {
- regs->tpc = regs->tnpc;
- regs->tnpc += 4;
- } else {
- unsigned long fsr = current->thread.xfsr[0];
- siginfo_t info;
- if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- regs->tpc &= 0xffffffff;
- regs->tnpc &= 0xffffffff;
- }
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_addr = (void *)regs->tpc;
- info.si_trapno = 0;
- info.si_code = __SI_FAULT;
- if ((fsr & 0x1c000) == (1 << 14)) {
- if (fsr & 0x10)
- info.si_code = FPE_FLTINV;
- else if (fsr & 0x08)
- info.si_code = FPE_FLTOVF;
- else if (fsr & 0x04)
- info.si_code = FPE_FLTUND;
- else if (fsr & 0x02)
- info.si_code = FPE_FLTDIV;
- else if (fsr & 0x01)
- info.si_code = FPE_FLTRES;
- }
- force_sig_info(SIGFPE, &info, current);
- }
- }
- void do_fpieee(struct pt_regs *regs)
- {
- do_fpe_common(regs);
- }
- extern int do_mathemu(struct pt_regs *, struct fpustate *);
- void do_fpother(struct pt_regs *regs)
- {
- struct fpustate *f = FPUSTATE;
- int ret = 0;
- switch ((current->thread.xfsr[0] & 0x1c000)) {
- case (2 << 14): /* unfinished_FPop */
- case (3 << 14): /* unimplemented_FPop */
- ret = do_mathemu(regs, f);
- break;
- }
- if (ret)
- return;
- do_fpe_common(regs);
- }
- void do_tof(struct pt_regs *regs)
- {
- siginfo_t info;
- if(regs->tstate & TSTATE_PRIV)
- die_if_kernel("Penguin overflow trap from kernel mode", regs);
- if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- regs->tpc &= 0xffffffff;
- regs->tnpc &= 0xffffffff;
- }
- info.si_signo = SIGEMT;
- info.si_errno = 0;
- info.si_code = EMT_TAGOVF;
- info.si_addr = (void *)regs->tpc;
- info.si_trapno = 0;
- force_sig_info(SIGEMT, &info, current);
- }
- void do_div0(struct pt_regs *regs)
- {
- siginfo_t info;
- if (regs->tstate & TSTATE_PRIV)
- die_if_kernel("TL0: Kernel divide by zero.", regs);
- if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- regs->tpc &= 0xffffffff;
- regs->tnpc &= 0xffffffff;
- }
- info.si_signo = SIGFPE;
- info.si_errno = 0;
- info.si_code = FPE_INTDIV;
- info.si_addr = (void *)regs->tpc;
- info.si_trapno = 0;
- force_sig_info(SIGFPE, &info, current);
- }
- void instruction_dump (unsigned int *pc)
- {
- int i;
- if((((unsigned long) pc) & 3))
- return;
- printk("Instruction DUMP:");
- for(i = -3; i < 6; i++)
- printk("%c%08x%c",i?' ':'<',pc[i],i?' ':'>');
- printk("n");
- }
- void user_instruction_dump (unsigned int *pc)
- {
- int i;
- unsigned int buf[9];
-
- if((((unsigned long) pc) & 3))
- return;
-
- if(copy_from_user(buf, pc - 3, sizeof(buf)))
- return;
- printk("Instruction DUMP:");
- for(i = 0; i < 9; i++)
- printk("%c%08x%c",i==3?' ':'<',buf[i],i==3?' ':'>');
- printk("n");
- }
- void show_trace_raw(struct task_struct *tsk, unsigned long ksp)
- {
- unsigned long pc, fp;
- unsigned long task_base = (unsigned long)tsk;
- struct reg_window *rw;
- int count = 0;
- fp = ksp + STACK_BIAS;
- do {
- /* Bogus frame pointer? */
- if (fp < (task_base + sizeof(struct task_struct)) ||
- fp >= (task_base + THREAD_SIZE))
- break;
- rw = (struct reg_window *)fp;
- pc = rw->ins[7];
- printk("[%016lx] ", pc);
- fp = rw->ins[6] + STACK_BIAS;
- } while (++count < 16);
- printk("n");
- }
- void show_trace_task(struct task_struct *tsk)
- {
- if (tsk)
- show_trace_raw(tsk, tsk->thread.ksp);
- }
- void die_if_kernel(char *str, struct pt_regs *regs)
- {
- extern void __show_regs(struct pt_regs * regs);
- extern void smp_report_regs(void);
- int count = 0;
- struct reg_window *lastrw;
-
- /* Amuse the user. */
- printk(
- " \|/ ____ \|/n"
- " "@'/ .. \`@"n"
- " /_| \__/ |_\n"
- " \__U_/n");
- printk("%s(%d): %sn", current->comm, current->pid, str);
- __asm__ __volatile__("flushw");
- __show_regs(regs);
- if(regs->tstate & TSTATE_PRIV) {
- struct reg_window *rw = (struct reg_window *)
- (regs->u_regs[UREG_FP] + STACK_BIAS);
- /* Stop the back trace when we hit userland or we
- * find some badly aligned kernel stack.
- */
- lastrw = (struct reg_window *)current;
- while(rw &&
- count++ < 30 &&
- rw >= lastrw &&
- (char *) rw < ((char *) current)
- + sizeof (union task_union) &&
- !(((unsigned long) rw) & 0x7)) {
- printk("Caller[%016lx]n", rw->ins[7]);
- lastrw = rw;
- rw = (struct reg_window *)
- (rw->ins[6] + STACK_BIAS);
- }
- instruction_dump ((unsigned int *) regs->tpc);
- } else {
- if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- regs->tpc &= 0xffffffff;
- regs->tnpc &= 0xffffffff;
- }
- user_instruction_dump ((unsigned int *) regs->tpc);
- }
- #ifdef CONFIG_SMP
- smp_report_regs();
- #endif
-
- if(regs->tstate & TSTATE_PRIV)
- do_exit(SIGKILL);
- do_exit(SIGSEGV);
- }
- extern int handle_popc(u32 insn, struct pt_regs *regs);
- extern int handle_ldf_stq(u32 insn, struct pt_regs *regs);
- void do_illegal_instruction(struct pt_regs *regs)
- {
- unsigned long pc = regs->tpc;
- unsigned long tstate = regs->tstate;
- u32 insn;
- siginfo_t info;
- if(tstate & TSTATE_PRIV)
- die_if_kernel("Kernel illegal instruction", regs);
- if(current->thread.flags & SPARC_FLAG_32BIT)
- pc = (u32)pc;
- if (get_user(insn, (u32 *)pc) != -EFAULT) {
- if ((insn & 0xc1ffc000) == 0x81700000) /* POPC */ {
- if (handle_popc(insn, regs))
- return;
- } else if ((insn & 0xc1580000) == 0xc1100000) /* LDQ/STQ */ {
- if (handle_ldf_stq(insn, regs))
- return;
- }
- }
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_ILLOPC;
- info.si_addr = (void *)pc;
- info.si_trapno = 0;
- force_sig_info(SIGILL, &info, current);
- }
- void mem_address_unaligned(struct pt_regs *regs, unsigned long sfar, unsigned long sfsr)
- {
- siginfo_t info;
- if(regs->tstate & TSTATE_PRIV) {
- extern void kernel_unaligned_trap(struct pt_regs *regs,
- unsigned int insn,
- unsigned long sfar, unsigned long sfsr);
- return kernel_unaligned_trap(regs, *((unsigned int *)regs->tpc), sfar, sfsr);
- }
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRALN;
- info.si_addr = (void *)sfar;
- info.si_trapno = 0;
- force_sig_info(SIGBUS, &info, current);
- }
- void do_privop(struct pt_regs *regs)
- {
- siginfo_t info;
- if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- regs->tpc &= 0xffffffff;
- regs->tnpc &= 0xffffffff;
- }
- info.si_signo = SIGILL;
- info.si_errno = 0;
- info.si_code = ILL_PRVOPC;
- info.si_addr = (void *)regs->tpc;
- info.si_trapno = 0;
- force_sig_info(SIGILL, &info, current);
- }
- void do_privact(struct pt_regs *regs)
- {
- do_privop(regs);
- }
- /* Trap level 1 stuff or other traps we should never see... */
- void do_cee(struct pt_regs *regs)
- {
- die_if_kernel("TL0: Cache Error Exception", regs);
- }
- void do_cee_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: Cache Error Exception", regs);
- }
- void do_dae_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: Data Access Exception", regs);
- }
- void do_iae_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: Instruction Access Exception", regs);
- }
- void do_div0_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: DIV0 Exception", regs);
- }
- void do_fpdis_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: FPU Disabled", regs);
- }
- void do_fpieee_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: FPU IEEE Exception", regs);
- }
- void do_fpother_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: FPU Other Exception", regs);
- }
- void do_ill_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: Illegal Instruction Exception", regs);
- }
- void do_irq_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: IRQ Exception", regs);
- }
- void do_lddfmna_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: LDDF Exception", regs);
- }
- void do_stdfmna_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: STDF Exception", regs);
- }
- void do_paw(struct pt_regs *regs)
- {
- die_if_kernel("TL0: Phys Watchpoint Exception", regs);
- }
- void do_paw_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: Phys Watchpoint Exception", regs);
- }
- void do_vaw(struct pt_regs *regs)
- {
- die_if_kernel("TL0: Virt Watchpoint Exception", regs);
- }
- void do_vaw_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: Virt Watchpoint Exception", regs);
- }
- void do_tof_tl1(struct pt_regs *regs)
- {
- dump_tl1_traplog((struct tl1_traplog *)(regs + 1));
- die_if_kernel("TL1: Tag Overflow Exception", regs);
- }
- void do_getpsr(struct pt_regs *regs)
- {
- regs->u_regs[UREG_I0] = tstate_to_psr(regs->tstate);
- regs->tpc = regs->tnpc;
- regs->tnpc += 4;
- if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
- regs->tpc &= 0xffffffff;
- regs->tnpc &= 0xffffffff;
- }
- }
- void trap_init(void)
- {
- /* Attach to the address space of init_task. */
- atomic_inc(&init_mm.mm_count);
- current->active_mm = &init_mm;
- /* NOTE: Other cpus have this done as they are started
- * up on SMP.
- */
- }