Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/swtch.S
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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: releng/6.0/sys/sparc64/sparc64/swtch.S 129749 2004-05-26 12:06:52Z tmm $"); 29 30 #include <machine/asmacros.h> 31 #include <machine/asi.h> 32 #include <machine/ktr.h> 33 #include <machine/tstate.h> 34 35 #include "assym.s" 36 37 .register %g2, #ignore 38 .register %g3, #ignore 39 40 /* 41 * void cpu_throw(struct thread *old, struct thread *new) 42 */ 43 ENTRY(cpu_throw) 44 save %sp, -CCFSZ, %sp 45 flushw 46 ba %xcc, .Lsw1 47 mov %i1, %i0 48 END(cpu_throw) 49 50 /* 51 * void cpu_switch(struct thread *old, struct thread *new) 52 */ 53 ENTRY(cpu_switch) 54 save %sp, -CCFSZ, %sp 55 mov %i1, %i0 56 57 /* 58 * If the current thread was using floating point in the kernel, save 59 * its context. The userland floating point context has already been 60 * saved in that case. 61 */ 62 rd %fprs, %l2 63 andcc %l2, FPRS_FEF, %g0 64 bz,a,pt %xcc, 1f 65 nop 66 call savefpctx 67 add PCB_REG, PCB_KFP, %o0 68 ba,a %xcc, 2f 69 nop 70 71 /* 72 * If the current thread was using floating point in userland, save 73 * its context. 74 */ 75 1: sub PCB_REG, TF_SIZEOF, %l2 76 ldx [%l2 + TF_FPRS], %l3 77 andcc %l3, FPRS_FEF, %g0 78 bz,a,pt %xcc, 2f 79 nop 80 call savefpctx 81 add PCB_REG, PCB_UFP, %o0 82 andn %l3, FPRS_FEF, %l3 83 stx %l3, [%l2 + TF_FPRS] 84 85 ldx [PCB_REG + PCB_FLAGS], %l3 86 or %l3, PCB_FEF, %l3 87 stx %l3, [PCB_REG + PCB_FLAGS] 88 89 /* 90 * Flush the windows out to the stack and save the current frame 91 * pointer and program counter. 92 */ 93 2: flushw 94 wrpr %g0, 0, %cleanwin 95 stx %fp, [PCB_REG + PCB_SP] 96 stx %i7, [PCB_REG + PCB_PC] 97 98 /* 99 * Load the new thread's frame pointer and program counter, and set 100 * the current thread and pcb. 101 */ 102 .Lsw1: 103 #if KTR_COMPILE & KTR_PROC 104 CATR(KTR_PROC, "cpu_switch: new td=%p pc=%#lx fp=%#lx" 105 , %g1, %g2, %g3, 7, 8, 9) 106 stx %i0, [%g1 + KTR_PARM1] 107 ldx [%i0 + TD_PCB], %g2 108 ldx [%g2 + PCB_PC], %g3 109 stx %g3, [%g1 + KTR_PARM2] 110 ldx [%g2 + PCB_SP], %g3 111 stx %g3, [%g1 + KTR_PARM3] 112 9: 113 #endif 114 ldx [%i0 + TD_PCB], %i1 115 116 stx %i0, [PCPU(CURTHREAD)] 117 stx %i1, [PCPU(CURPCB)] 118 119 wrpr %g0, PSTATE_NORMAL, %pstate 120 mov %i1, PCB_REG 121 wrpr %g0, PSTATE_ALT, %pstate 122 mov %i1, PCB_REG 123 wrpr %g0, PSTATE_KERNEL, %pstate 124 125 ldx [PCB_REG + PCB_SP], %fp 126 ldx [PCB_REG + PCB_PC], %i7 127 sub %fp, CCFSZ, %sp 128 129 /* 130 * Point to the pmaps of the new process, and of the last non-kernel 131 * process to run. 132 */ 133 ldx [%i0 + TD_PROC], %i2 134 ldx [PCPU(PMAP)], %l2 135 ldx [%i2 + P_VMSPACE], %i5 136 add %i5, VM_PMAP, %i2 137 138 #if KTR_COMPILE & KTR_PROC 139 CATR(KTR_PROC, "cpu_switch: new pmap=%p old pmap=%p" 140 , %g1, %g2, %g3, 7, 8, 9) 141 stx %i2, [%g1 + KTR_PARM1] 142 stx %l2, [%g1 + KTR_PARM2] 143 9: 144 #endif 145 146 /* 147 * If they are the same we are done. 148 */ 149 cmp %l2, %i2 150 be,a,pn %xcc, 5f 151 nop 152 153 /* 154 * If the new process is a kernel thread we can just leave the old 155 * context active and avoid recycling its context number. 156 */ 157 SET(vmspace0, %i4, %i3) 158 cmp %i5, %i3 159 be,a,pn %xcc, 5f 160 nop 161 162 /* 163 * If there was no non-kernel pmap, don't try to deactivate it. 164 */ 165 brz,a,pn %l2, 3f 166 nop 167 168 /* 169 * Mark the pmap of the last non-kernel vmspace to run as no longer 170 * active on this cpu. 171 */ 172 lduw [%l2 + PM_ACTIVE], %l3 173 lduw [PCPU(CPUMASK)], %l4 174 andn %l3, %l4, %l3 175 stw %l3, [%l2 + PM_ACTIVE] 176 177 /* 178 * Take away its context number. 179 */ 180 lduw [PCPU(CPUID)], %l3 181 sllx %l3, INT_SHIFT, %l3 182 add %l2, PM_CONTEXT, %l4 183 mov -1, %l5 184 stw %l5, [%l3 + %l4] 185 186 /* 187 * Find a new tlb context. If we've run out we have to flush all user 188 * mappings from the tlb and reset the context numbers. 189 */ 190 3: lduw [PCPU(TLB_CTX)], %i3 191 lduw [PCPU(TLB_CTX_MAX)], %i4 192 cmp %i3, %i4 193 bne,a,pt %xcc, 4f 194 nop 195 SET(tlb_flush_user, %i5, %i4) 196 ldx [%i4], %i5 197 call %i5 198 nop 199 lduw [PCPU(TLB_CTX_MIN)], %i3 200 201 /* 202 * Advance next free context. 203 */ 204 4: add %i3, 1, %i4 205 stw %i4, [PCPU(TLB_CTX)] 206 207 /* 208 * Set the new context number in the pmap. 209 */ 210 lduw [PCPU(CPUID)], %i4 211 sllx %i4, INT_SHIFT, %i4 212 add %i2, PM_CONTEXT, %i5 213 stw %i3, [%i4 + %i5] 214 215 /* 216 * Mark the pmap as active on this cpu. 217 */ 218 lduw [%i2 + PM_ACTIVE], %i4 219 lduw [PCPU(CPUMASK)], %i5 220 or %i4, %i5, %i4 221 stw %i4, [%i2 + PM_ACTIVE] 222 223 /* 224 * Make note of the change in pmap. 225 */ 226 stx %i2, [PCPU(PMAP)] 227 228 /* 229 * Fiddle the hardware bits. Set the tsb registers and install the 230 * new context number in the cpu. 231 */ 232 ldx [%i2 + PM_TSB], %i4 233 mov AA_DMMU_TSB, %i5 234 stxa %i4, [%i5] ASI_DMMU 235 mov AA_IMMU_TSB, %i5 236 stxa %i4, [%i5] ASI_IMMU 237 mov AA_DMMU_PCXR, %i5 238 stxa %i3, [%i5] ASI_DMMU 239 membar #Sync 240 241 /* 242 * Done. Return and load the new process's window from the stack. 243 */ 244 5: ret 245 restore 246 END(cpu_switch) 247 248 ENTRY(savectx) 249 save %sp, -CCFSZ, %sp 250 flushw 251 call savefpctx 252 add %i0, PCB_UFP, %o0 253 stx %fp, [%i0 + PCB_SP] 254 stx %i7, [%i0 + PCB_PC] 255 ret 256 restore %g0, 0, %o0 257 END(savectx) 258 259 /* 260 * void savefpctx(uint32_t *); 261 */ 262 ENTRY(savefpctx) 263 wr %g0, FPRS_FEF, %fprs 264 wr %g0, ASI_BLK_S, %asi 265 stda %f0, [%o0 + (0 * 64)] %asi 266 stda %f16, [%o0 + (1 * 64)] %asi 267 stda %f32, [%o0 + (2 * 64)] %asi 268 stda %f48, [%o0 + (3 * 64)] %asi 269 membar #Sync 270 retl 271 wr %g0, 0, %fprs 272 END(savefpctx)
Cache object: 1a438dba4f7fd29e031fdbe25d6ab39c
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]