Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/swtch.S
Version:
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1 /*- 2 * Copyright (c) 2001 Jake Burkholder. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <machine/asm.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <machine/asmacros.h> 31 #include <machine/asi.h> 32 #include <machine/fsr.h> 33 #include <machine/ktr.h> 34 #include <machine/pcb.h> 35 #include <machine/tstate.h> 36 37 #include "assym.s" 38 39 .register %g2, #ignore 40 .register %g3, #ignore 41 42 /* 43 * void cpu_throw(struct thread *old, struct thread *new) 44 */ 45 ENTRY(cpu_throw) 46 save %sp, -CCFSZ, %sp 47 flushw 48 ba %xcc, .Lsw1 49 mov %i1, %i0 50 END(cpu_throw) 51 52 /* 53 * void cpu_switch(struct thread *old, struct thread *new) 54 */ 55 ENTRY(cpu_switch) 56 save %sp, -CCFSZ, %sp 57 mov %i1, %i0 58 59 /* 60 * If the current thread was using floating point in the kernel, save 61 * its context. The userland floating point context has already been 62 * saved in that case. 63 */ 64 rd %fprs, %l2 65 andcc %l2, FPRS_FEF, %g0 66 bz,a,pt %xcc, 1f 67 nop 68 call savefpctx 69 add PCB_REG, PCB_KFP, %o0 70 ba,a %xcc, 2f 71 nop 72 73 /* 74 * If the current thread was using floating point in userland, save 75 * its context. 76 */ 77 1: sub PCB_REG, TF_SIZEOF, %l2 78 ldx [%l2 + TF_FPRS], %l3 79 andcc %l3, FPRS_FEF, %g0 80 bz,a,pt %xcc, 2f 81 nop 82 call savefpctx 83 add PCB_REG, PCB_UFP, %o0 84 andn %l3, FPRS_FEF, %l3 85 stx %l3, [%l2 + TF_FPRS] 86 87 ldx [PCB_REG + PCB_FLAGS], %l3 88 or %l3, PCB_FEF, %l3 89 stx %l3, [PCB_REG + PCB_FLAGS] 90 91 /* 92 * Flush the windows out to the stack and save the current frame 93 * pointer and program counter. 94 */ 95 2: flushw 96 wrpr %g0, 0, %cleanwin 97 stx %fp, [PCB_REG + PCB_SP] 98 stx %i7, [PCB_REG + PCB_PC] 99 100 /* 101 * Load the new thread's frame pointer and program counter, and set 102 * the current thread and pcb. 103 */ 104 .Lsw1: 105 #if KTR_COMPILE & KTR_PROC 106 CATR(KTR_PROC, "cpu_switch: new td=%p pc=%#lx fp=%#lx" 107 , %g1, %g2, %g3, 7, 8, 9) 108 stx %i0, [%g1 + KTR_PARM1] 109 ldx [%i0 + TD_PCB], %g2 110 ldx [%g2 + PCB_PC], %g3 111 stx %g3, [%g1 + KTR_PARM2] 112 ldx [%g2 + PCB_SP], %g3 113 stx %g3, [%g1 + KTR_PARM3] 114 9: 115 #endif 116 ldx [%i0 + TD_PCB], %i1 117 118 stx %i0, [PCPU(CURTHREAD)] 119 stx %i1, [PCPU(CURPCB)] 120 121 wrpr %g0, PSTATE_NORMAL, %pstate 122 mov %i1, PCB_REG 123 wrpr %g0, PSTATE_ALT, %pstate 124 mov %i1, PCB_REG 125 wrpr %g0, PSTATE_KERNEL, %pstate 126 127 ldx [PCB_REG + PCB_SP], %fp 128 ldx [PCB_REG + PCB_PC], %i7 129 sub %fp, CCFSZ, %sp 130 131 /* 132 * Point to the pmaps of the new process, and of the last non-kernel 133 * process to run. 134 */ 135 ldx [%i0 + TD_PROC], %i2 136 ldx [PCPU(PMAP)], %l2 137 ldx [%i2 + P_VMSPACE], %i5 138 add %i5, VM_PMAP, %i2 139 140 #if KTR_COMPILE & KTR_PROC 141 CATR(KTR_PROC, "cpu_switch: new pmap=%p old pmap=%p" 142 , %g1, %g2, %g3, 7, 8, 9) 143 stx %i2, [%g1 + KTR_PARM1] 144 stx %l2, [%g1 + KTR_PARM2] 145 9: 146 #endif 147 148 /* 149 * If they are the same we are done. 150 */ 151 cmp %l2, %i2 152 be,a,pn %xcc, 5f 153 nop 154 155 /* 156 * If the new process is a kernel thread we can just leave the old 157 * context active and avoid recycling its context number. 158 */ 159 SET(vmspace0, %i4, %i3) 160 cmp %i5, %i3 161 be,a,pn %xcc, 5f 162 nop 163 164 /* 165 * If there was no non-kernel pmap, don't try to deactivate it. 166 */ 167 brz,a,pn %l2, 3f 168 nop 169 170 /* 171 * Mark the pmap of the last non-kernel vmspace to run as no longer 172 * active on this cpu. 173 */ 174 lduw [%l2 + PM_ACTIVE], %l3 175 lduw [PCPU(CPUMASK)], %l4 176 andn %l3, %l4, %l3 177 stw %l3, [%l2 + PM_ACTIVE] 178 179 /* 180 * Take away its context number. 181 */ 182 lduw [PCPU(CPUID)], %l3 183 sllx %l3, INT_SHIFT, %l3 184 add %l2, PM_CONTEXT, %l4 185 mov -1, %l5 186 stw %l5, [%l3 + %l4] 187 188 /* 189 * Find a new tlb context. If we've run out we have to flush all user 190 * mappings from the tlb and reset the context numbers. 191 */ 192 3: lduw [PCPU(TLB_CTX)], %i3 193 lduw [PCPU(TLB_CTX_MAX)], %i4 194 cmp %i3, %i4 195 bne,a,pt %xcc, 4f 196 nop 197 SET(tlb_flush_user, %i5, %i4) 198 ldx [%i4], %i5 199 call %i5 200 nop 201 lduw [PCPU(TLB_CTX_MIN)], %i3 202 203 /* 204 * Advance next free context. 205 */ 206 4: add %i3, 1, %i4 207 stw %i4, [PCPU(TLB_CTX)] 208 209 /* 210 * Set the new context number in the pmap. 211 */ 212 lduw [PCPU(CPUID)], %i4 213 sllx %i4, INT_SHIFT, %i4 214 add %i2, PM_CONTEXT, %i5 215 stw %i3, [%i4 + %i5] 216 217 /* 218 * Mark the pmap as active on this cpu. 219 */ 220 lduw [%i2 + PM_ACTIVE], %i4 221 lduw [PCPU(CPUMASK)], %i5 222 or %i4, %i5, %i4 223 stw %i4, [%i2 + PM_ACTIVE] 224 225 /* 226 * Make note of the change in pmap. 227 */ 228 stx %i2, [PCPU(PMAP)] 229 230 /* 231 * Fiddle the hardware bits. Set the tsb registers and install the 232 * new context number in the cpu. 233 */ 234 ldx [%i2 + PM_TSB], %i4 235 mov AA_DMMU_TSB, %i5 236 stxa %i4, [%i5] ASI_DMMU 237 mov AA_IMMU_TSB, %i5 238 stxa %i4, [%i5] ASI_IMMU 239 mov AA_DMMU_PCXR, %i5 240 stxa %i3, [%i5] ASI_DMMU 241 membar #Sync 242 243 /* 244 * Done. Return and load the new process's window from the stack. 245 */ 246 5: ret 247 restore 248 END(cpu_switch) 249 250 ENTRY(savectx) 251 save %sp, -CCFSZ, %sp 252 flushw 253 call savefpctx 254 add %i0, PCB_UFP, %o0 255 stx %fp, [%i0 + PCB_SP] 256 stx %i7, [%i0 + PCB_PC] 257 ret 258 restore %g0, 0, %o0 259 END(savectx) 260 261 /* 262 * void savefpctx(uint32_t *); 263 */ 264 ENTRY(savefpctx) 265 wr %g0, FPRS_FEF, %fprs 266 wr %g0, ASI_BLK_S, %asi 267 stda %f0, [%o0 + (0 * 64)] %asi 268 stda %f16, [%o0 + (1 * 64)] %asi 269 stda %f32, [%o0 + (2 * 64)] %asi 270 stda %f48, [%o0 + (3 * 64)] %asi 271 membar #Sync 272 retl 273 wr %g0, 0, %fprs 274 END(savefpctx)
Cache object: c2c94911844014942b4fef5348831f9e
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