Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/xen/locore.s
Version:
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1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)locore.s 7.3 (Berkeley) 5/13/91 33 * $FreeBSD: releng/8.0/sys/i386/xen/locore.s 184039 2008-10-19 01:23:30Z kmacy $ 34 * 35 * originally from: locore.s, by William F. Jolitz 36 * 37 * Substantially rewritten by David Greenman, Rod Grimes, 38 * Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp 39 * and many others. 40 */ 41 42 #include "opt_bootp.h" 43 #include "opt_compat.h" 44 #include "opt_nfsroot.h" 45 #include "opt_global.h" 46 #include "opt_pmap.h" 47 48 #include <sys/syscall.h> 49 #include <sys/reboot.h> 50 51 #include <machine/asmacros.h> 52 #include <machine/cputypes.h> 53 #include <machine/psl.h> 54 #include <machine/pmap.h> 55 #include <machine/specialreg.h> 56 57 #define __ASSEMBLY__ 58 #include <xen/interface/elfnote.h> 59 60 /* The defines below have been lifted out of <machine/xen-public/arch-x86_32.h> */ 61 #define FLAT_RING1_CS 0xe019 /* GDT index 259 */ 62 #define FLAT_RING1_DS 0xe021 /* GDT index 260 */ 63 #define KERNEL_CS FLAT_RING1_CS 64 #define KERNEL_DS FLAT_RING1_DS 65 66 #include "assym.s" 67 68 .section __xen_guest 69 .ascii "LOADER=generic,GUEST_OS=freebsd,GUEST_VER=7.0,XEN_VER=xen-3.0,BSD_SYMTAB,VIRT_BASE=0xc0000000" 70 .byte 0 71 72 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz, "FreeBSD") 73 ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz, "HEAD") 74 ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz, "xen-3.0") 75 ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, .long, KERNBASE) 76 ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, .long, KERNBASE) 77 ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, .long, btext) 78 ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, .long, hypercall_page) 79 ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, .long, HYPERVISOR_VIRT_START) 80 #if 0 81 ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz, "writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel") 82 #endif 83 ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz, "writable_page_tables|supervisor_mode_kernel|writable_descriptor_tables") 84 85 #ifdef PAE 86 ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz, "yes") 87 ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, .long, PG_V, PG_V) 88 #else 89 ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz, "no") 90 ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, .long, PG_V, PG_V) 91 #endif 92 ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz, "generic") 93 ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long, 1) 94 95 96 97 /* 98 * XXX 99 * 100 * Note: This version greatly munged to avoid various assembler errors 101 * that may be fixed in newer versions of gas. Perhaps newer versions 102 * will have more pleasant appearance. 103 */ 104 105 /* 106 * PTmap is recursive pagemap at top of virtual address space. 107 * Within PTmap, the page directory can be found (third indirection). 108 */ 109 .globl PTmap,PTD,PTDpde 110 .set PTmap,(PTDPTDI << PDRSHIFT) 111 .set PTD,PTmap + (PTDPTDI * PAGE_SIZE) 112 .set PTDpde,PTD + (PTDPTDI * PDESIZE) 113 114 /* 115 * Compiled KERNBASE location and the kernel load address 116 */ 117 .globl kernbase 118 .set kernbase,KERNBASE 119 .globl kernload 120 .set kernload,KERNLOAD 121 122 /* 123 * Globals 124 */ 125 .data 126 ALIGN_DATA /* just to be sure */ 127 128 .space 0x2000 /* space for tmpstk - temporary stack */ 129 tmpstk: 130 131 .globl bootinfo 132 bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */ 133 134 .globl KERNend 135 KERNend: .long 0 /* phys addr end of kernel (just after bss) */ 136 .globl physfree 137 physfree: .long 0 /* phys addr of next free page */ 138 139 .globl IdlePTD 140 IdlePTD: .long 0 /* phys addr of kernel PTD */ 141 142 #ifdef PAE 143 .globl IdlePDPT 144 IdlePDPT: .long 0 /* phys addr of kernel PDPT */ 145 #endif 146 147 #ifdef SMP 148 .globl KPTphys 149 #endif 150 KPTphys: .long 0 /* phys addr of kernel page tables */ 151 #ifdef SMP 152 .globl gdtset 153 #endif 154 gdtset: .long 0 /* GDT is valid */ 155 156 .globl proc0kstack 157 proc0uarea: .long 0 /* address of proc 0 uarea (unused)*/ 158 proc0kstack: .long 0 /* address of proc 0 kstack space */ 159 p0upa: .long 0 /* phys addr of proc0 UAREA (unused) */ 160 p0kpa: .long 0 /* phys addr of proc0's STACK */ 161 162 vm86phystk: .long 0 /* PA of vm86/bios stack */ 163 164 .globl vm86paddr, vm86pa 165 vm86paddr: .long 0 /* address of vm86 region */ 166 vm86pa: .long 0 /* phys addr of vm86 region */ 167 168 #ifdef PC98 169 .globl pc98_system_parameter 170 pc98_system_parameter: 171 .space 0x240 172 #endif 173 174 .globl avail_space 175 avail_space: .long 0 176 177 /********************************************************************** 178 * 179 * Some handy macros 180 * 181 */ 182 183 /* 184 * We're already in protected mode, so no remapping is needed. 185 */ 186 #define R(foo) (foo) 187 188 #define ALLOCPAGES(foo) \ 189 movl R(physfree), %esi ; \ 190 movl $((foo)*PAGE_SIZE), %eax ; \ 191 addl %esi, %eax ; \ 192 movl %eax, R(physfree) ; \ 193 movl %esi, %edi ; \ 194 movl $((foo)*PAGE_SIZE),%ecx ; \ 195 xorl %eax,%eax ; \ 196 cld ; \ 197 rep ; \ 198 stosb 199 200 /* 201 * fillkpt 202 * eax = page frame address 203 * ebx = index into page table 204 * ecx = how many pages to map 205 * base = base address of page dir/table 206 * prot = protection bits 207 */ 208 #define fillkpt(base, prot) \ 209 shll $PTESHIFT,%ebx ; \ 210 addl base,%ebx ; \ 211 orl $PG_V,%eax ; \ 212 orl prot,%eax ; \ 213 1: movl %eax,(%ebx) ; \ 214 addl $PAGE_SIZE,%eax ; /* increment physical address */ \ 215 addl $PTESIZE,%ebx ; /* next pte */ \ 216 loop 1b 217 218 /* 219 * fillkptphys(prot) 220 * eax = physical address 221 * ecx = how many pages to map 222 * prot = protection bits 223 */ 224 #define fillkptphys(prot) \ 225 movl %eax, %ebx ; \ 226 shrl $PAGE_SHIFT, %ebx ; \ 227 fillkpt(R(KPTphys), prot) 228 229 /* Temporary stack */ 230 .space 8192 231 tmpstack: 232 .long tmpstack, KERNEL_DS 233 234 .text 235 236 .p2align 12, 0x90 237 238 #define HYPERCALL_PAGE_OFFSET 0x1000 239 .org HYPERCALL_PAGE_OFFSET 240 ENTRY(hypercall_page) 241 .cfi_startproc 242 .skip 0x1000 243 .cfi_endproc 244 245 /********************************************************************** 246 * 247 * This is where the bootblocks start us, set the ball rolling... 248 * 249 */ 250 NON_GPROF_ENTRY(btext) 251 /* At the end of our stack, we shall have free space - so store it */ 252 movl %esp,%ebx 253 movl %ebx,R(avail_space) 254 255 lss tmpstack,%esp 256 257 pushl %esi 258 call initvalues 259 popl %esi 260 261 /* Store the CPUID information */ 262 xorl %eax,%eax 263 cpuid # cpuid 0 264 movl %eax,R(cpu_high) # highest capability 265 movl %ebx,R(cpu_vendor) # store vendor string 266 movl %edx,R(cpu_vendor+4) 267 movl %ecx,R(cpu_vendor+8) 268 movb $0,R(cpu_vendor+12) 269 270 movl $1,%eax 271 cpuid # cpuid 1 272 movl %eax,R(cpu_id) # store cpu_id 273 movl %ebx,R(cpu_procinfo) # store cpu_procinfo 274 movl %edx,R(cpu_feature) # store cpu_feature 275 movl %ecx,R(cpu_feature2) # store cpu_feature2 276 rorl $8,%eax # extract family type 277 andl $15,%eax 278 cmpl $5,%eax 279 movl $CPU_686,R(cpu) 280 281 movl proc0kstack,%eax 282 leal (KSTACK_PAGES*PAGE_SIZE-PCB_SIZE)(%eax),%esp 283 xorl %ebp,%ebp /* mark end of frames */ 284 #ifdef PAE 285 movl IdlePDPT,%esi 286 #else 287 movl IdlePTD,%esi 288 #endif 289 movl %esi,(KSTACK_PAGES*PAGE_SIZE-PCB_SIZE+PCB_CR3)(%eax) 290 pushl physfree 291 call init386 292 addl $4, %esp 293 call mi_startup 294 /* NOTREACHED */ 295 int $3 296 297 /* 298 * Signal trampoline, copied to top of user stack 299 */ 300 NON_GPROF_ENTRY(sigcode) 301 calll *SIGF_HANDLER(%esp) 302 leal SIGF_UC(%esp),%eax /* get ucontext */ 303 pushl %eax 304 testl $PSL_VM,UC_EFLAGS(%eax) 305 jne 1f 306 mov UC_GS(%eax), %gs /* restore %gs */ 307 1: 308 movl $SYS_sigreturn,%eax 309 pushl %eax /* junk to fake return addr. */ 310 int $0x80 /* enter kernel with args */ 311 /* on stack */ 312 1: 313 jmp 1b 314 315 #ifdef COMPAT_FREEBSD4 316 ALIGN_TEXT 317 freebsd4_sigcode: 318 calll *SIGF_HANDLER(%esp) 319 leal SIGF_UC4(%esp),%eax /* get ucontext */ 320 pushl %eax 321 testl $PSL_VM,UC4_EFLAGS(%eax) 322 jne 1f 323 mov UC4_GS(%eax),%gs /* restore %gs */ 324 1: 325 movl $344,%eax /* 4.x SYS_sigreturn */ 326 pushl %eax /* junk to fake return addr. */ 327 int $0x80 /* enter kernel with args */ 328 /* on stack */ 329 1: 330 jmp 1b 331 #endif 332 333 #ifdef COMPAT_43 334 ALIGN_TEXT 335 osigcode: 336 call *SIGF_HANDLER(%esp) /* call signal handler */ 337 lea SIGF_SC(%esp),%eax /* get sigcontext */ 338 pushl %eax 339 testl $PSL_VM,SC_PS(%eax) 340 jne 9f 341 movl SC_GS(%eax),%gs /* restore %gs */ 342 9: 343 movl $103,%eax /* 3.x SYS_sigreturn */ 344 pushl %eax /* junk to fake return addr. */ 345 int $0x80 /* enter kernel with args */ 346 0: jmp 0b 347 #endif /* COMPAT_43 */ 348 349 ALIGN_TEXT 350 esigcode: 351 352 .data 353 .globl szsigcode 354 szsigcode: 355 .long esigcode-sigcode 356 #ifdef COMPAT_FREEBSD4 357 .globl szfreebsd4_sigcode 358 szfreebsd4_sigcode: 359 .long esigcode-freebsd4_sigcode 360 #endif 361 #ifdef COMPAT_43 362 .globl szosigcode 363 szosigcode: 364 .long esigcode-osigcode 365 #endif
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