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/8.1/sys/i386/xen/locore.s 199774 2009-11-25 01:55:34Z 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 .globl gdtset 152 gdtset: .long 0 /* GDT is valid */ 153 154 .globl proc0kstack 155 proc0uarea: .long 0 /* address of proc 0 uarea (unused)*/ 156 proc0kstack: .long 0 /* address of proc 0 kstack space */ 157 p0upa: .long 0 /* phys addr of proc0 UAREA (unused) */ 158 p0kpa: .long 0 /* phys addr of proc0's STACK */ 159 160 vm86phystk: .long 0 /* PA of vm86/bios stack */ 161 162 .globl vm86paddr, vm86pa 163 vm86paddr: .long 0 /* address of vm86 region */ 164 vm86pa: .long 0 /* phys addr of vm86 region */ 165 166 #ifdef PC98 167 .globl pc98_system_parameter 168 pc98_system_parameter: 169 .space 0x240 170 #endif 171 172 .globl avail_space 173 avail_space: .long 0 174 175 /********************************************************************** 176 * 177 * Some handy macros 178 * 179 */ 180 181 /* 182 * We're already in protected mode, so no remapping is needed. 183 */ 184 #define R(foo) (foo) 185 186 #define ALLOCPAGES(foo) \ 187 movl R(physfree), %esi ; \ 188 movl $((foo)*PAGE_SIZE), %eax ; \ 189 addl %esi, %eax ; \ 190 movl %eax, R(physfree) ; \ 191 movl %esi, %edi ; \ 192 movl $((foo)*PAGE_SIZE),%ecx ; \ 193 xorl %eax,%eax ; \ 194 cld ; \ 195 rep ; \ 196 stosb 197 198 /* 199 * fillkpt 200 * eax = page frame address 201 * ebx = index into page table 202 * ecx = how many pages to map 203 * base = base address of page dir/table 204 * prot = protection bits 205 */ 206 #define fillkpt(base, prot) \ 207 shll $PTESHIFT,%ebx ; \ 208 addl base,%ebx ; \ 209 orl $PG_V,%eax ; \ 210 orl prot,%eax ; \ 211 1: movl %eax,(%ebx) ; \ 212 addl $PAGE_SIZE,%eax ; /* increment physical address */ \ 213 addl $PTESIZE,%ebx ; /* next pte */ \ 214 loop 1b 215 216 /* 217 * fillkptphys(prot) 218 * eax = physical address 219 * ecx = how many pages to map 220 * prot = protection bits 221 */ 222 #define fillkptphys(prot) \ 223 movl %eax, %ebx ; \ 224 shrl $PAGE_SHIFT, %ebx ; \ 225 fillkpt(R(KPTphys), prot) 226 227 /* Temporary stack */ 228 .space 8192 229 tmpstack: 230 .long tmpstack, KERNEL_DS 231 232 .text 233 234 .p2align 12, 0x90 235 236 #define HYPERCALL_PAGE_OFFSET 0x1000 237 .org HYPERCALL_PAGE_OFFSET 238 ENTRY(hypercall_page) 239 .cfi_startproc 240 .skip 0x1000 241 .cfi_endproc 242 243 /********************************************************************** 244 * 245 * This is where the bootblocks start us, set the ball rolling... 246 * 247 */ 248 NON_GPROF_ENTRY(btext) 249 /* At the end of our stack, we shall have free space - so store it */ 250 movl %esp,%ebx 251 movl %ebx,R(avail_space) 252 253 lss tmpstack,%esp 254 255 pushl %esi 256 call initvalues 257 popl %esi 258 259 /* Store the CPUID information */ 260 xorl %eax,%eax 261 cpuid # cpuid 0 262 movl %eax,R(cpu_high) # highest capability 263 movl %ebx,R(cpu_vendor) # store vendor string 264 movl %edx,R(cpu_vendor+4) 265 movl %ecx,R(cpu_vendor+8) 266 movb $0,R(cpu_vendor+12) 267 268 movl $1,%eax 269 cpuid # cpuid 1 270 movl %eax,R(cpu_id) # store cpu_id 271 movl %ebx,R(cpu_procinfo) # store cpu_procinfo 272 movl %edx,R(cpu_feature) # store cpu_feature 273 movl %ecx,R(cpu_feature2) # store cpu_feature2 274 rorl $8,%eax # extract family type 275 andl $15,%eax 276 cmpl $5,%eax 277 movl $CPU_686,R(cpu) 278 279 movl proc0kstack,%eax 280 leal (KSTACK_PAGES*PAGE_SIZE-PCB_SIZE)(%eax),%esp 281 xorl %ebp,%ebp /* mark end of frames */ 282 #ifdef PAE 283 movl IdlePDPT,%esi 284 #else 285 movl IdlePTD,%esi 286 #endif 287 movl %esi,(KSTACK_PAGES*PAGE_SIZE-PCB_SIZE+PCB_CR3)(%eax) 288 pushl physfree 289 call init386 290 addl $4, %esp 291 call mi_startup 292 /* NOTREACHED */ 293 int $3 294 295 /* 296 * Signal trampoline, copied to top of user stack 297 */ 298 NON_GPROF_ENTRY(sigcode) 299 calll *SIGF_HANDLER(%esp) 300 leal SIGF_UC(%esp),%eax /* get ucontext */ 301 pushl %eax 302 testl $PSL_VM,UC_EFLAGS(%eax) 303 jne 1f 304 mov UC_GS(%eax), %gs /* restore %gs */ 305 1: 306 movl $SYS_sigreturn,%eax 307 pushl %eax /* junk to fake return addr. */ 308 int $0x80 /* enter kernel with args */ 309 /* on stack */ 310 1: 311 jmp 1b 312 313 #ifdef COMPAT_FREEBSD4 314 ALIGN_TEXT 315 freebsd4_sigcode: 316 calll *SIGF_HANDLER(%esp) 317 leal SIGF_UC4(%esp),%eax /* get ucontext */ 318 pushl %eax 319 testl $PSL_VM,UC4_EFLAGS(%eax) 320 jne 1f 321 mov UC4_GS(%eax),%gs /* restore %gs */ 322 1: 323 movl $344,%eax /* 4.x SYS_sigreturn */ 324 pushl %eax /* junk to fake return addr. */ 325 int $0x80 /* enter kernel with args */ 326 /* on stack */ 327 1: 328 jmp 1b 329 #endif 330 331 #ifdef COMPAT_43 332 ALIGN_TEXT 333 osigcode: 334 call *SIGF_HANDLER(%esp) /* call signal handler */ 335 lea SIGF_SC(%esp),%eax /* get sigcontext */ 336 pushl %eax 337 testl $PSL_VM,SC_PS(%eax) 338 jne 9f 339 movl SC_GS(%eax),%gs /* restore %gs */ 340 9: 341 movl $103,%eax /* 3.x SYS_sigreturn */ 342 pushl %eax /* junk to fake return addr. */ 343 int $0x80 /* enter kernel with args */ 344 0: jmp 0b 345 #endif /* COMPAT_43 */ 346 347 ALIGN_TEXT 348 esigcode: 349 350 .data 351 .globl szsigcode 352 szsigcode: 353 .long esigcode-sigcode 354 #ifdef COMPAT_FREEBSD4 355 .globl szfreebsd4_sigcode 356 szfreebsd4_sigcode: 357 .long esigcode-freebsd4_sigcode 358 #endif 359 #ifdef COMPAT_43 360 .globl szosigcode 361 szosigcode: 362 .long esigcode-osigcode 363 #endif
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