vm_machdep.c revision 1.60
1 /* $NetBSD: vm_machdep.c,v 1.60 2012/08/29 07:09:12 matt Exp $ */ 2 3 /* 4 * Copyright (c) 1994-1998 Mark Brinicombe. 5 * Copyright (c) 1994 Brini. 6 * All rights reserved. 7 * 8 * This code is derived from software written for Brini by Mark Brinicombe 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Brini. 21 * 4. The name of the company nor the name of the author may be used to 22 * endorse or promote products derived from this software without specific 23 * prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED 26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 29 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 30 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * RiscBSD kernel project 38 * 39 * vm_machdep.h 40 * 41 * vm machine specific bits 42 * 43 * Created : 08/10/94 44 */ 45 46 #include <sys/cdefs.h> 47 __KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.60 2012/08/29 07:09:12 matt Exp $"); 48 49 #include "opt_armfpe.h" 50 #include "opt_pmap_debug.h" 51 #include "opt_perfctrs.h" 52 #include "opt_cputypes.h" 53 54 #include <sys/param.h> 55 #include <sys/systm.h> 56 #include <sys/proc.h> 57 #include <sys/malloc.h> 58 #include <sys/vnode.h> 59 #include <sys/cpu.h> 60 #include <sys/buf.h> 61 #include <sys/pmc.h> 62 #include <sys/exec.h> 63 #include <sys/syslog.h> 64 65 #include <uvm/uvm_extern.h> 66 67 #include <machine/pcb.h> 68 #include <machine/pmap.h> 69 #include <machine/reg.h> 70 #include <machine/vmparam.h> 71 72 #ifdef ARMFPE 73 #include <arm/fpe-arm/armfpe.h> 74 #endif 75 76 extern pv_addr_t systempage; 77 78 int process_read_regs(struct proc *p, struct reg *regs); 79 int process_read_fpregs(struct proc *p, struct fpreg *regs); 80 81 void lwp_trampoline(void); 82 83 /* 84 * Special compilation symbols: 85 * 86 * STACKCHECKS - Fill undefined and supervisor stacks with a known pattern 87 * on forking and check the pattern on exit, reporting 88 * the amount of stack used. 89 */ 90 91 void 92 cpu_proc_fork(struct proc *p1, struct proc *p2) 93 { 94 95 #if defined(PERFCTRS) 96 if (PMC_ENABLED(p1)) 97 pmc_md_fork(p1, p2); 98 else { 99 p2->p_md.pmc_enabled = 0; 100 p2->p_md.pmc_state = NULL; 101 } 102 #endif 103 } 104 105 /* 106 * Finish a fork operation, with LWP l2 nearly set up. 107 * 108 * Copy and update the pcb and trapframe, making the child ready to run. 109 * 110 * Rig the child's kernel stack so that it will start out in 111 * lwp_trampoline() which will call the specified func with the argument arg. 112 * 113 * If an alternate user-level stack is requested (with non-zero values 114 * in both the stack and stacksize args), set up the user stack pointer 115 * accordingly. 116 */ 117 void 118 cpu_lwp_fork(struct lwp *l1, struct lwp *l2, void *stack, size_t stacksize, 119 void (*func)(void *), void *arg) 120 { 121 struct pcb *pcb1, *pcb2; 122 struct switchframe *sf; 123 vaddr_t uv; 124 125 pcb1 = lwp_getpcb(l1); 126 pcb2 = lwp_getpcb(l2); 127 128 #ifdef PMAP_DEBUG 129 if (pmap_debug_level >= 0) 130 printf("cpu_lwp_fork: %p %p %p %p\n", l1, l2, curlwp, &lwp0); 131 #endif /* PMAP_DEBUG */ 132 133 #if 0 /* XXX */ 134 if (l1 == curlwp) { 135 /* Sync the PCB before we copy it. */ 136 savectx(curpcb); 137 } 138 #endif 139 140 l2->l_md.md_flags = l1->l_md.md_flags & MDLWP_VFPUSED; 141 142 /* Copy the pcb */ 143 *pcb2 = *pcb1; 144 145 /* 146 * Set up the kernel stack for the process. 147 * Note: this stack is not in use if we are forking from p1 148 */ 149 uv = uvm_lwp_getuarea(l2); 150 pcb2->pcb_sp = uv + USPACE_SVC_STACK_TOP; 151 152 #ifdef STACKCHECKS 153 /* Fill the kernel stack with a known pattern */ 154 memset((void *)(uv + USPACE_SVC_STACK_BOTTOM), 0xdd, 155 (USPACE_SVC_STACK_TOP - USPACE_SVC_STACK_BOTTOM)); 156 #endif /* STACKCHECKS */ 157 158 #ifdef PMAP_DEBUG 159 if (pmap_debug_level >= 0) { 160 printf("l1: pcb=%p pid=%d pmap=%p\n", 161 pcb1, l1->l_lid, l1->l_proc->p_vmspace->vm_map.pmap); 162 printf("l2: pcb=%p pid=%d pmap=%p\n", 163 pcb2, l2->l_lid, l2->l_proc->p_vmspace->vm_map.pmap); 164 } 165 #endif /* PMAP_DEBUG */ 166 167 #ifdef ARMFPE 168 /* Initialise a new FP context for p2 and copy the context from p1 */ 169 arm_fpe_core_initcontext(FP_CONTEXT(l2)); 170 arm_fpe_copycontext(FP_CONTEXT(l1), FP_CONTEXT(l2)); 171 #endif /* ARMFPE */ 172 173 struct trapframe *tf = (struct trapframe *)pcb2->pcb_sp - 1; 174 lwp_settrapframe(l2, tf); 175 *tf = *lwp_trapframe(l1); 176 177 /* 178 * If specified, give the child a different stack (make sure 179 * it's 8-byte aligned). 180 */ 181 if (stack != NULL) 182 tf->tf_usr_sp = ((vaddr_t)(stack) + stacksize) & -8; 183 184 sf = (struct switchframe *)tf - 1; 185 sf->sf_r4 = (u_int)func; 186 sf->sf_r5 = (u_int)arg; 187 sf->sf_r7 = PSR_USR32_MODE; /* for returning to userspace */ 188 sf->sf_sp = (u_int)tf; 189 sf->sf_pc = (u_int)lwp_trampoline; 190 pcb2->pcb_sp = (u_int)sf; 191 } 192 193 /* 194 * cpu_exit is called as the last action during exit. 195 * 196 * We clean up a little and then call switch_exit() with the old proc as an 197 * argument. switch_exit() first switches to lwp0's context, and finally 198 * jumps into switch() to wait for another process to wake up. 199 */ 200 201 void 202 cpu_lwp_free(struct lwp *l, int proc) 203 { 204 #ifdef ARMFPE 205 /* Abort any active FP operation and deactivate the context */ 206 arm_fpe_core_abort(FP_CONTEXT(l), NULL, NULL); 207 arm_fpe_core_changecontext(0); 208 #endif /* ARMFPE */ 209 210 #ifdef STACKCHECKS 211 /* Report how much stack has been used - debugging */ 212 if (l) { 213 u_char *ptr; 214 int loop; 215 216 ptr = (u_char *)pcb + USPACE_SVC_STACK_BOTTOM; 217 for (loop = 0; loop < (USPACE_SVC_STACK_TOP - USPACE_SVC_STACK_BOTTOM) 218 && *ptr == 0xdd; ++loop, ++ptr) ; 219 log(LOG_INFO, "%d bytes of svc stack fill pattern\n", loop); 220 } 221 #endif /* STACKCHECKS */ 222 } 223 224 void 225 cpu_lwp_free2(struct lwp *l) 226 { 227 } 228 229 /* 230 * Map a user I/O request into kernel virtual address space. 231 * Note: the pages are already locked by uvm_vslock(), so we 232 * do not need to pass an access_type to pmap_enter(). 233 */ 234 int 235 vmapbuf(struct buf *bp, vsize_t len) 236 { 237 vaddr_t faddr, taddr, off; 238 paddr_t fpa; 239 240 241 #ifdef PMAP_DEBUG 242 if (pmap_debug_level >= 0) 243 printf("vmapbuf: bp=%08x buf=%08x len=%08x\n", (u_int)bp, 244 (u_int)bp->b_data, (u_int)len); 245 #endif /* PMAP_DEBUG */ 246 247 if ((bp->b_flags & B_PHYS) == 0) 248 panic("vmapbuf"); 249 250 bp->b_saveaddr = bp->b_data; 251 faddr = trunc_page((vaddr_t)bp->b_data); 252 off = (vaddr_t)bp->b_data - faddr; 253 len = round_page(off + len); 254 taddr = uvm_km_alloc(phys_map, len, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA); 255 bp->b_data = (void *)(taddr + off); 256 257 /* 258 * The region is locked, so we expect that pmap_pte() will return 259 * non-NULL. 260 */ 261 while (len) { 262 (void) pmap_extract(vm_map_pmap(&bp->b_proc->p_vmspace->vm_map), 263 faddr, &fpa); 264 pmap_enter(pmap_kernel(), taddr, fpa, 265 VM_PROT_READ|VM_PROT_WRITE, VM_PROT_READ|VM_PROT_WRITE|PMAP_WIRED); 266 faddr += PAGE_SIZE; 267 taddr += PAGE_SIZE; 268 len -= PAGE_SIZE; 269 } 270 pmap_update(pmap_kernel()); 271 272 return 0; 273 } 274 275 /* 276 * Unmap a previously-mapped user I/O request. 277 */ 278 void 279 vunmapbuf(struct buf *bp, vsize_t len) 280 { 281 vaddr_t addr, off; 282 283 #ifdef PMAP_DEBUG 284 if (pmap_debug_level >= 0) 285 printf("vunmapbuf: bp=%08x buf=%08x len=%08x\n", 286 (u_int)bp, (u_int)bp->b_data, (u_int)len); 287 #endif /* PMAP_DEBUG */ 288 289 if ((bp->b_flags & B_PHYS) == 0) 290 panic("vunmapbuf"); 291 292 /* 293 * Make sure the cache does not have dirty data for the 294 * pages we had mapped. 295 */ 296 addr = trunc_page((vaddr_t)bp->b_data); 297 off = (vaddr_t)bp->b_data - addr; 298 len = round_page(off + len); 299 300 pmap_remove(pmap_kernel(), addr, addr + len); 301 pmap_update(pmap_kernel()); 302 uvm_km_free(phys_map, addr, len, UVM_KMF_VAONLY); 303 bp->b_data = bp->b_saveaddr; 304 bp->b_saveaddr = 0; 305 } 306 307 /* End of vm_machdep.c */ 308
Indexes created Mon Sep 29 21:09:56 GMT 2025