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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | /* * IA32 helper functions * * 06/16/00 A. Mallick added csd/ssd/tssd for ia32 thread context */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/mm.h> #include <linux/sched.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/system.h> #include <asm/processor.h> #include <asm/ia32.h> extern unsigned long *ia32_gdt_table, *ia32_tss; extern void die_if_kernel (char *str, struct pt_regs *regs, long err); void ia32_save_state (struct thread_struct *thread) { unsigned long eflag, fsr, fcr, fir, fdr, csd, ssd, tssd; asm ("mov %0=ar.eflag;" "mov %1=ar.fsr;" "mov %2=ar.fcr;" "mov %3=ar.fir;" "mov %4=ar.fdr;" "mov %5=ar.csd;" "mov %6=ar.ssd;" "mov %7=ar.k1" : "=r"(eflag), "=r"(fsr), "=r"(fcr), "=r"(fir), "=r"(fdr), "=r"(csd), "=r"(ssd), "=r"(tssd)); thread->eflag = eflag; thread->fsr = fsr; thread->fcr = fcr; thread->fir = fir; thread->fdr = fdr; thread->csd = csd; thread->ssd = ssd; thread->tssd = tssd; asm ("mov ar.k0=%0 ;;" :: "r"(thread->old_iob)); } void ia32_load_state (struct thread_struct *thread) { unsigned long eflag, fsr, fcr, fir, fdr, csd, ssd, tssd; eflag = thread->eflag; fsr = thread->fsr; fcr = thread->fcr; fir = thread->fir; fdr = thread->fdr; csd = thread->csd; ssd = thread->ssd; tssd = thread->tssd; asm volatile ("mov ar.eflag=%0;" "mov ar.fsr=%1;" "mov ar.fcr=%2;" "mov ar.fir=%3;" "mov ar.fdr=%4;" "mov ar.csd=%5;" "mov ar.ssd=%6;" "mov ar.k1=%7" :: "r"(eflag), "r"(fsr), "r"(fcr), "r"(fir), "r"(fdr), "r"(csd), "r"(ssd), "r"(tssd)); asm ("mov %0=ar.k0 ;;" : "=r"(thread->old_iob)); asm ("mov ar.k0=%0 ;;" :: "r"(IA32_IOBASE)); } /* * Setup IA32 GDT and TSS */ void ia32_gdt_init(void) { unsigned long gdt_and_tss_page; /* allocate two IA-32 pages of memory: */ gdt_and_tss_page = __get_free_pages(GFP_KERNEL, (IA32_PAGE_SHIFT < PAGE_SHIFT) ? 0 : (IA32_PAGE_SHIFT + 1) - PAGE_SHIFT); ia32_gdt_table = (unsigned long *) gdt_and_tss_page; ia32_tss = (unsigned long *) (gdt_and_tss_page + IA32_PAGE_SIZE); /* Zero the gdt and tss */ memset((void *) gdt_and_tss_page, 0, 2*IA32_PAGE_SIZE); /* CS descriptor in IA-32 format */ ia32_gdt_table[4] = IA32_SEG_DESCRIPTOR(0L, 0xBFFFFFFFL, 0xBL, 1L, 3L, 1L, 1L, 1L, 1L); /* DS descriptor in IA-32 format */ ia32_gdt_table[5] = IA32_SEG_DESCRIPTOR(0L, 0xBFFFFFFFL, 0x3L, 1L, 3L, 1L, 1L, 1L, 1L); } /* * Handle bad IA32 interrupt via syscall */ void ia32_bad_interrupt (unsigned long int_num, struct pt_regs *regs) { siginfo_t siginfo; die_if_kernel("Bad IA-32 interrupt", regs, int_num); siginfo.si_signo = SIGTRAP; siginfo.si_errno = int_num; /* XXX is it legal to abuse si_errno like this? */ siginfo.si_code = TRAP_BRKPT; force_sig_info(SIGTRAP, &siginfo, current); } |