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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 | /* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Head.S contains the MIPS exception handler and startup code. * * Copyright (C) 1994, 1995 Waldorf Electronics * Written by Ralf Baechle and Andreas Busse * Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999 Ralf Baechle * Copyright (C) 1999 Silicon Graphics, Inc. */ #define __ASSEMBLY__ #include <linux/config.h> #include <linux/init.h> #include <asm/asm.h> #include <asm/regdef.h> #include <asm/processor.h> #include <asm/mipsregs.h> #include <asm/stackframe.h> #include <asm/pgtable.h> #include <asm/sn/addrs.h> #include <asm/sn/sn0/hubni.h> #include <asm/sn/klkernvars.h> .macro ARC64_TWIDDLE_PC #if defined(CONFIG_ARC64) || defined(CONFIG_MAPPED_KERNEL) /* We get launched at a XKPHYS address but the kernel is linked to run at a KSEG0 address, so jump there. */ la t0, \@f jr t0 \@: #endif .endm #ifdef CONFIG_SGI_IP27 /* * outputs the local nasid into t1. */ .macro GET_NASID_ASM dli t1, LOCAL_HUB_ADDR(NI_STATUS_REV_ID) ld t1, (t1) and t1, NSRI_NODEID_MASK dsrl t1, NSRI_NODEID_SHFT .endm #endif /* CONFIG_SGI_IP27 */ /* * inputs are the text nasid in t1, data nasid in t2. */ .macro MAPPED_KERNEL_SETUP_TLB #ifdef CONFIG_MAPPED_KERNEL /* * This needs to read the nasid - assume 0 for now. * Drop in 0xffffffffc0000000 in tlbhi, 0+VG in tlblo_0, * 0+DVG in tlblo_1. */ dli t0, 0xffffffffc0000000 dmtc0 t0, CP0_ENTRYHI li t0, 0x1c000 # Offset of text into node memory dsll t1, NASID_SHFT # Shift text nasid into place dsll t2, NASID_SHFT # Same for data nasid or t1, t1, t0 # Physical load address of kernel text or t2, t2, t0 # Physical load address of kernel data dsrl t1, 12 # 4K pfn dsrl t2, 12 # 4K pfn dsll t1, 6 # Get pfn into place dsll t2, 6 # Get pfn into place li t0, ((_PAGE_GLOBAL|_PAGE_VALID| _CACHE_CACHABLE_COW) >> 6) or t0, t0, t1 mtc0 t0, CP0_ENTRYLO0 # physaddr, VG, cach exlwr li t0, ((_PAGE_GLOBAL|_PAGE_VALID| _PAGE_DIRTY|_CACHE_CACHABLE_COW) >> 6) or t0, t0, t2 mtc0 t0, CP0_ENTRYLO1 # physaddr, DVG, cach exlwr li t0, 0x1ffe000 # MAPPED_KERN_TLBMASK, TLBPGMASK_16M mtc0 t0, CP0_PAGEMASK li t0, 0 # KMAP_INX mtc0 t0, CP0_INDEX li t0, 1 mtc0 t0, CP0_WIRED tlbwi #else mtc0 zero, CP0_WIRED #endif .endm .text EXPORT(stext) # used for profiling EXPORT(_stext) __INIT NESTED(kernel_entry, 16, sp) # kernel entry point ori sp, 0xf # align stack on 16 byte. xori sp, 0xf #ifdef CONFIG_SGI_IP27 GET_NASID_ASM move t2, t1 # text and data are here MAPPED_KERNEL_SETUP_TLB #endif /* IP27 */ ARC64_TWIDDLE_PC CLI # disable interrupts mfc0 t0, CP0_STATUS /* * On IP27, I am seeing the TS bit set when the * kernel is loaded. Maybe because the kernel is * in ckseg0 and not xkphys? Clear it anyway ... */ li t1, ~(ST0_TS|ST0_CU1|ST0_CU2|ST0_CU3) and t0, t1 or t0, (ST0_CU0|ST0_KX|ST0_SX|ST0_FR) # Bogosity: cu0 indicates kernel mtc0 t0, CP0_STATUS # thread in copy_thread. la $28, init_task_union # init current pointer daddiu t0, $28, KERNEL_STACK_SIZE-32 sd t0, kernelsp dsubu sp, t0, 4*SZREG # init stack pointer move t0, $28 #ifdef CONFIG_SMP mtc0 t0, CP0_WATCHLO dsrl32 t0, t0, 0 mtc0 t0, CP0_WATCHHI #endif /* Note that all firmware passed argument registers still have their values. */ jal prom_init # initialize firmware jal start_kernel 1: b 1b # just in case ... END(kernel_entry) #ifdef CONFIG_SGI_IP27 NESTED(bootstrap, 16, sp) GET_NASID_ASM li t0, KLDIR_OFFSET + (KLI_KERN_VARS * KLDIR_ENT_SIZE) + KLDIR_OFF_POINTER + K0BASE dsll t1, NASID_SHFT or t0, t0, t1 ld t0, 0(t0) # t0 points to kern_vars struct lh t1, KV_RO_NASID_OFFSET(t0) lh t2, KV_RW_NASID_OFFSET(t0) MAPPED_KERNEL_SETUP_TLB ARC64_TWIDDLE_PC CLI mfc0 t0, CP0_STATUS li t1, ~(ST0_CU1|ST0_CU2|ST0_CU3) and t0, t1 or t0, (ST0_CU0|ST0_KX|ST0_SX|ST0_FR) # Bogosity: cu0 indicates kernel mtc0 t0, CP0_STATUS # thread in copy_thread. jal cboot END(bootstrap) #endif /* CONFIG_SGI_IP27 */ __FINIT .comm kernelsp, 8, 8 # current stackpointer #undef PAGE_SIZE #define PAGE_SIZE 0x1000 .macro page name, order=0 .globl \name \name: .size \name, (PAGE_SIZE << \order) .org . + (PAGE_SIZE << \order) .type \name, @object .endm .data .align 12 page swapper_pg_dir, 1 page invalid_pte_table, 0 page invalid_pmd_table, 1 page kptbl, KPTBL_PAGE_ORDER .globl ekptbl page kpmdtbl, 0 ekptbl: |