locore.s revision 90132
14Srgrimes/*- 24Srgrimes * Copyright (c) 1990 The Regents of the University of California. 34Srgrimes * All rights reserved. 44Srgrimes * 54Srgrimes * This code is derived from software contributed to Berkeley by 64Srgrimes * William Jolitz. 74Srgrimes * 84Srgrimes * Redistribution and use in source and binary forms, with or without 94Srgrimes * modification, are permitted provided that the following conditions 104Srgrimes * are met: 114Srgrimes * 1. Redistributions of source code must retain the above copyright 124Srgrimes * notice, this list of conditions and the following disclaimer. 134Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 144Srgrimes * notice, this list of conditions and the following disclaimer in the 154Srgrimes * documentation and/or other materials provided with the distribution. 164Srgrimes * 3. All advertising materials mentioning features or use of this software 174Srgrimes * must display the following acknowledgement: 184Srgrimes * This product includes software developed by the University of 194Srgrimes * California, Berkeley and its contributors. 204Srgrimes * 4. Neither the name of the University nor the names of its contributors 214Srgrimes * may be used to endorse or promote products derived from this software 224Srgrimes * without specific prior written permission. 234Srgrimes * 244Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 254Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 264Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 274Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 284Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 294Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 304Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 314Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 324Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 334Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 344Srgrimes * SUCH DAMAGE. 354Srgrimes * 36556Srgrimes * from: @(#)locore.s 7.3 (Berkeley) 5/13/91 3750477Speter * $FreeBSD: head/sys/i386/i386/locore.s 90132 2002-02-03 09:13:58Z bde $ 3815392Sphk * 39757Sdg * originally from: locore.s, by William F. Jolitz 40757Sdg * 41757Sdg * Substantially rewritten by David Greenman, Rod Grimes, 4215392Sphk * Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp 4315392Sphk * and many others. 444Srgrimes */ 454Srgrimes 4632358Seivind#include "opt_bootp.h" 4790132Sbde#include "opt_compat.h" 4837272Sjmg#include "opt_nfsroot.h" 4914835Sbde 5014835Sbde#include <sys/syscall.h> 515908Sbde#include <sys/reboot.h> 524Srgrimes 5314835Sbde#include <machine/asmacros.h> 5414835Sbde#include <machine/cputypes.h> 5514835Sbde#include <machine/psl.h> 5615543Sphk#include <machine/pmap.h> 5714835Sbde#include <machine/specialreg.h> 5814835Sbde 5914835Sbde#include "assym.s" 6014835Sbde 6173017Speter#ifdef __AOUT__ 6273017Speter#define etext _etext 6373017Speter#define edata _edata 6473017Speter#define end _end 6573017Speter#endif 6673017Speter 674Srgrimes/* 68757Sdg * XXX 69757Sdg * 704Srgrimes * Note: This version greatly munged to avoid various assembler errors 714Srgrimes * that may be fixed in newer versions of gas. Perhaps newer versions 724Srgrimes * will have more pleasant appearance. 734Srgrimes */ 744Srgrimes 75200Sdg/* 764Srgrimes * PTmap is recursive pagemap at top of virtual address space. 774Srgrimes * Within PTmap, the page directory can be found (third indirection). 7882307Sjulian * 7982307Sjulian * NOTE: PTDpde, PTmap, and PTD are being defined as address symbols. 8082307Sjulian * In C you access them directly, and not with a '*'. Storage is not being 8182308Speter * allocated. They will magically address the correct locations in KVM 8282394Speter * which C will treat as normal variables of the type they are defined in 8382307Sjulian * machine/pmap.h, i.e. PTDpde = XX ; to set a PDE entry, NOT *PTDpde = XX; 844Srgrimes */ 8573011Sjake .globl PTmap,PTD,PTDpde 8673011Sjake .set PTmap,(PTDPTDI << PDRSHIFT) 8773011Sjake .set PTD,PTmap + (PTDPTDI * PAGE_SIZE) 8873011Sjake .set PTDpde,PTD + (PTDPTDI * PDESIZE) 89592Srgrimes 903861Sbde/* 914Srgrimes * APTmap, APTD is the alternate recursive pagemap. 924Srgrimes * It's used when modifying another process's page tables. 9382307Sjulian * See the note above. It is true here as well. 944Srgrimes */ 9573011Sjake .globl APTmap,APTD,APTDpde 9673011Sjake .set APTmap,APTDPTDI << PDRSHIFT 9773011Sjake .set APTD,APTmap + (APTDPTDI * PAGE_SIZE) 9873011Sjake .set APTDpde,PTD + (APTDPTDI * PDESIZE) 994Srgrimes 10070928Sjake#ifdef SMP 1014Srgrimes/* 10270928Sjake * Define layout of per-cpu address space. 10370928Sjake * This is "constructed" in locore.s on the BSP and in mp_machdep.c 10470928Sjake * for each AP. DO NOT REORDER THESE WITHOUT UPDATING THE REST! 10570928Sjake */ 10673011Sjake .globl SMP_prvspace, lapic 10773011Sjake .set SMP_prvspace,(MPPTDI << PDRSHIFT) 10873011Sjake .set lapic,SMP_prvspace + (NPTEPG-1) * PAGE_SIZE 10970928Sjake#endif /* SMP */ 11070928Sjake 11170928Sjake/* 11282262Speter * Compiled KERNBASE location 11382262Speter */ 11482262Speter .globl kernbase 11582262Speter .set kernbase,KERNBASE 11682262Speter 11782262Speter/* 118556Srgrimes * Globals 119556Srgrimes */ 120556Srgrimes .data 12114835Sbde ALIGN_DATA /* just to be sure */ 122134Sdg 12325083Sjdp .globl HIDENAME(tmpstk) 12413729Sdg .space 0x2000 /* space for tmpstk - temporary stack */ 12525083SjdpHIDENAME(tmpstk): 1263842Sdg 12782957Speter .globl bootinfo 12873011Sjakebootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */ 1294Srgrimes 13073011SjakeKERNend: .long 0 /* phys addr end of kernel (just after bss) */ 13115428Sphkphysfree: .long 0 /* phys addr of next free page */ 132757Sdg 13326812Speter#ifdef SMP 13473011Sjake .globl cpu0prvpage 13525164Spetercpu0pp: .long 0 /* phys addr cpu0 private pg */ 13673011Sjakecpu0prvpage: .long 0 /* relocated version */ 13725164Speter 13873011Sjake .globl SMPpt 13946129SluoqiSMPptpa: .long 0 /* phys addr SMP page table */ 14073011SjakeSMPpt: .long 0 /* relocated version */ 14126812Speter#endif /* SMP */ 14225164Speter 14373011Sjake .globl IdlePTD 14473011SjakeIdlePTD: .long 0 /* phys addr of kernel PTD */ 1453861Sbde 14626812Speter#ifdef SMP 14773011Sjake .globl KPTphys 14826812Speter#endif 14973011SjakeKPTphys: .long 0 /* phys addr of kernel page tables */ 1504Srgrimes 15183366Sjulian .globl proc0uarea, proc0kstack 15283366Sjulianproc0uarea: .long 0 /* address of proc 0 uarea space */ 15383366Sjulianproc0kstack: .long 0 /* address of proc 0 kstack space */ 15483366Sjulianp0upa: .long 0 /* phys addr of proc0's UAREA */ 15583366Sjulianp0kpa: .long 0 /* phys addr of proc0's STACK */ 156134Sdg 15737889Sjlemonvm86phystk: .long 0 /* PA of vm86/bios stack */ 15837889Sjlemon 15973011Sjake .globl vm86paddr, vm86pa 16073011Sjakevm86paddr: .long 0 /* address of vm86 region */ 16173011Sjakevm86pa: .long 0 /* phys addr of vm86 region */ 16234840Sjlemon 16315428Sphk#ifdef BDE_DEBUGGER 16415428Sphk .globl _bdb_exists /* flag to indicate BDE debugger is present */ 16515428Sphk_bdb_exists: .long 0 16615428Sphk#endif 167718Swollman 16843434Skato#ifdef PC98 16973011Sjake .globl pc98_system_parameter 17073011Sjakepc98_system_parameter: 17143434Skato .space 0x240 17243434Skato#endif 17315428Sphk 17415392Sphk/********************************************************************** 17515392Sphk * 17615392Sphk * Some handy macros 17715392Sphk * 178556Srgrimes */ 179134Sdg 18015392Sphk#define R(foo) ((foo)-KERNBASE) 18115392Sphk 18215392Sphk#define ALLOCPAGES(foo) \ 18315392Sphk movl R(physfree), %esi ; \ 18415543Sphk movl $((foo)*PAGE_SIZE), %eax ; \ 18515392Sphk addl %esi, %eax ; \ 18615392Sphk movl %eax, R(physfree) ; \ 18715392Sphk movl %esi, %edi ; \ 18815543Sphk movl $((foo)*PAGE_SIZE),%ecx ; \ 18915392Sphk xorl %eax,%eax ; \ 19015428Sphk cld ; \ 19115428Sphk rep ; \ 19215428Sphk stosb 19315392Sphk 194134Sdg/* 19515392Sphk * fillkpt 19615565Sphk * eax = page frame address 19715565Sphk * ebx = index into page table 19815392Sphk * ecx = how many pages to map 19915565Sphk * base = base address of page dir/table 20015565Sphk * prot = protection bits 201134Sdg */ 20215565Sphk#define fillkpt(base, prot) \ 20319621Sdyson shll $2,%ebx ; \ 20419621Sdyson addl base,%ebx ; \ 20519621Sdyson orl $PG_V,%eax ; \ 20619621Sdyson orl prot,%eax ; \ 20715565Sphk1: movl %eax,(%ebx) ; \ 20815565Sphk addl $PAGE_SIZE,%eax ; /* increment physical address */ \ 20915565Sphk addl $4,%ebx ; /* next pte */ \ 21015428Sphk loop 1b 21115392Sphk 21215565Sphk/* 21315565Sphk * fillkptphys(prot) 21415565Sphk * eax = physical address 21515565Sphk * ecx = how many pages to map 21615565Sphk * prot = protection bits 21715565Sphk */ 21815565Sphk#define fillkptphys(prot) \ 21915565Sphk movl %eax, %ebx ; \ 22015565Sphk shrl $PAGE_SHIFT, %ebx ; \ 22173011Sjake fillkpt(R(KPTphys), prot) 22215565Sphk 22315392Sphk .text 22415392Sphk/********************************************************************** 22515392Sphk * 22615392Sphk * This is where the bootblocks start us, set the ball rolling... 22715392Sphk * 22815392Sphk */ 2291321SdgNON_GPROF_ENTRY(btext) 2304Srgrimes 23124112Skato#ifdef PC98 23224112Skato /* save SYSTEM PARAMETER for resume (NS/T or other) */ 23343434Skato movl $0xa1400,%esi 23473011Sjake movl $R(pc98_system_parameter),%edi 23543434Skato movl $0x0240,%ecx 23624112Skato cld 23724112Skato rep 23824112Skato movsb 23924112Skato#else /* IBM-PC */ 24015428Sphk#ifdef BDE_DEBUGGER 24115428Sphk#ifdef BIOS_STEALS_3K 24215428Sphk cmpl $0x0375c339,0x95504 24315428Sphk#else 24415428Sphk cmpl $0x0375c339,0x96104 /* XXX - debugger signature */ 24515428Sphk#endif 24615428Sphk jne 1f 24715428Sphk movb $1,R(_bdb_exists) 24815428Sphk1: 24915428Sphk#endif 25015392Sphk/* Tell the bios to warmboot next time */ 25115392Sphk movw $0x1234,0x472 25254128Skato#endif /* PC98 */ 25315392Sphk 25415428Sphk/* Set up a real frame in case the double return in newboot is executed. */ 2553384Srgrimes pushl %ebp 2563384Srgrimes movl %esp, %ebp 2573384Srgrimes 25815392Sphk/* Don't trust what the BIOS gives for eflags. */ 2595603Sbde pushl $PSL_KERNEL 2602486Sdg popfl 26115428Sphk 26215428Sphk/* 26315428Sphk * Don't trust what the BIOS gives for %fs and %gs. Trust the bootstrap 26415428Sphk * to set %cs, %ds, %es and %ss. 26515428Sphk */ 26615428Sphk mov %ds, %ax 2674217Sphk mov %ax, %fs 2684217Sphk mov %ax, %gs 2694217Sphk 27015392Sphk call recover_bootinfo 27115392Sphk 27215428Sphk/* Get onto a stack that we can trust. */ 27315428Sphk/* 27415428Sphk * XXX this step is delayed in case recover_bootinfo needs to return via 27515428Sphk * the old stack, but it need not be, since recover_bootinfo actually 27615428Sphk * returns via the old frame. 27715428Sphk */ 27825083Sjdp movl $R(HIDENAME(tmpstk)),%esp 27915392Sphk 28024112Skato#ifdef PC98 28143447Skato /* pc98_machine_type & M_EPSON_PC98 */ 28273011Sjake testb $0x02,R(pc98_system_parameter)+220 28324112Skato jz 3f 28443447Skato /* epson_machine_id <= 0x0b */ 28573011Sjake cmpb $0x0b,R(pc98_system_parameter)+224 28624112Skato ja 3f 28724112Skato 28824112Skato /* count up memory */ 28924112Skato movl $0x100000,%eax /* next, talley remaining memory */ 29024112Skato movl $0xFFF-0x100,%ecx 29124112Skato1: movl 0(%eax),%ebx /* save location to check */ 29224112Skato movl $0xa55a5aa5,0(%eax) /* write test pattern */ 29324112Skato cmpl $0xa55a5aa5,0(%eax) /* does not check yet for rollover */ 29424112Skato jne 2f 29524112Skato movl %ebx,0(%eax) /* restore memory */ 29624112Skato addl $PAGE_SIZE,%eax 29724112Skato loop 1b 29824112Skato2: subl $0x100000,%eax 29924112Skato shrl $17,%eax 30073011Sjake movb %al,R(pc98_system_parameter)+1 30124112Skato3: 30258786Skato 30373011Sjake movw R(pc98_system_parameter+0x86),%ax 30473011Sjake movw %ax,R(cpu_id) 30524112Skato#endif 30624112Skato 30715392Sphk call identify_cpu 30815392Sphk 30915392Sphk/* clear bss */ 31015428Sphk/* 31117120Sbde * XXX this should be done a little earlier. 31215428Sphk * 31317120Sbde * XXX we don't check that there is memory for our bss and page tables 31417120Sbde * before using it. 31515428Sphk * 31615428Sphk * XXX the boot program somewhat bogusly clears the bss. We still have 31715428Sphk * to do it in case we were unzipped by kzipboot. Then the boot program 31815428Sphk * only clears kzipboot's bss. 31915428Sphk * 32015428Sphk * XXX the gdt and idt are still somewhere in the boot program. We 32115428Sphk * depend on the convention that the boot program is below 1MB and we 32215428Sphk * are above 1MB to keep the gdt and idt away from the bss and page 32317120Sbde * tables. The idt is only used if BDE_DEBUGGER is enabled. 32415428Sphk */ 32573011Sjake movl $R(end),%ecx 32673011Sjake movl $R(edata),%edi 32715392Sphk subl %edi,%ecx 32815392Sphk xorl %eax,%eax 32915428Sphk cld 33015428Sphk rep 33115428Sphk stosb 33215392Sphk 33315392Sphk call create_pagetables 33415392Sphk 33527993Sdyson/* 33627993Sdyson * If the CPU has support for VME, turn it on. 33727993Sdyson */ 33873011Sjake testl $CPUID_VME, R(cpu_feature) 33927993Sdyson jz 1f 34027993Sdyson movl %cr4, %eax 34127993Sdyson orl $CR4_VME, %eax 34227993Sdyson movl %eax, %cr4 34327993Sdyson1: 34427993Sdyson 34515428Sphk#ifdef BDE_DEBUGGER 34615428Sphk/* 34715428Sphk * Adjust as much as possible for paging before enabling paging so that the 34815428Sphk * adjustments can be traced. 34915428Sphk */ 35015428Sphk call bdb_prepare_paging 35115428Sphk#endif 35215428Sphk 35315392Sphk/* Now enable paging */ 35473011Sjake movl R(IdlePTD), %eax 35515392Sphk movl %eax,%cr3 /* load ptd addr into mmu */ 35615392Sphk movl %cr0,%eax /* get control word */ 35715392Sphk orl $CR0_PE|CR0_PG,%eax /* enable paging */ 35815392Sphk movl %eax,%cr0 /* and let's page NOW! */ 35915392Sphk 36015428Sphk#ifdef BDE_DEBUGGER 36115428Sphk/* 36215428Sphk * Complete the adjustments for paging so that we can keep tracing through 36317120Sbde * initi386() after the low (physical) addresses for the gdt and idt become 36415428Sphk * invalid. 36515428Sphk */ 36615428Sphk call bdb_commit_paging 36715428Sphk#endif 36815428Sphk 36915428Sphk pushl $begin /* jump to high virtualized address */ 37015392Sphk ret 37115392Sphk 37215392Sphk/* now running relocated at KERNBASE where the system is linked to run */ 37315392Sphkbegin: 37415392Sphk /* set up bootstrap stack */ 37583366Sjulian movl proc0kstack,%eax /* location of in-kernel stack */ 37683366Sjulian /* bootstrap stack end location */ 37783366Sjulian leal (KSTACK_PAGES*PAGE_SIZE-PCB_SIZE)(%eax),%esp 37865815Sbde 37965815Sbde xorl %ebp,%ebp /* mark end of frames */ 38065815Sbde 38173011Sjake movl IdlePTD,%esi 38283366Sjulian movl %esi,(KSTACK_PAGES*PAGE_SIZE-PCB_SIZE+PCB_CR3)(%eax) 38315392Sphk 38482140Siwasaki testl $CPUID_PGE, R(cpu_feature) 38582140Siwasaki jz 1f 38682140Siwasaki movl %cr4, %eax 38782140Siwasaki orl $CR4_PGE, %eax 38882140Siwasaki movl %eax, %cr4 38982140Siwasaki1: 39065815Sbde pushl physfree /* value of first for init386(first) */ 39173011Sjake call init386 /* wire 386 chip for unix operation */ 39215392Sphk 39365815Sbde /* 39465815Sbde * Clean up the stack in a way that db_numargs() understands, so 39565815Sbde * that backtraces in ddb don't underrun the stack. Traps for 39665815Sbde * inaccessible memory are more fatal than usual this early. 39765815Sbde */ 39865815Sbde addl $4,%esp 39965815Sbde 40073011Sjake call mi_startup /* autoconfiguration, mountroot etc */ 40165815Sbde /* NOTREACHED */ 40265815Sbde addl $0,%esp /* for db_numargs() again */ 40315392Sphk 40424691Speter/* 40515392Sphk * Signal trampoline, copied to top of user stack 40615392Sphk */ 40715392SphkNON_GPROF_ENTRY(sigcode) 40860303Sobrien call *SIGF_HANDLER(%esp) /* call signal handler */ 40951984Smarcel lea SIGF_UC(%esp),%eax /* get ucontext_t */ 41015392Sphk pushl %eax 41152140Sluoqi testl $PSL_VM,UC_EFLAGS(%eax) 41252140Sluoqi jne 9f 41352140Sluoqi movl UC_GS(%eax),%gs /* restore %gs */ 41452140Sluoqi9: 41552140Sluoqi movl $SYS_sigreturn,%eax 41651792Smarcel pushl %eax /* junk to fake return addr. */ 41751792Smarcel int $0x80 /* enter kernel with args */ 41852140Sluoqi0: jmp 0b 41952140Sluoqi 42090132Sbde#ifdef COMPAT_43 42125083Sjdp ALIGN_TEXT 42273011Sjakeosigcode: 42360303Sobrien call *SIGF_HANDLER(%esp) /* call signal handler */ 42452140Sluoqi lea SIGF_SC(%esp),%eax /* get sigcontext */ 42552140Sluoqi pushl %eax 42652140Sluoqi testl $PSL_VM,SC_PS(%eax) 42752140Sluoqi jne 9f 42852140Sluoqi movl SC_GS(%eax),%gs /* restore %gs */ 42952140Sluoqi9: 43090132Sbde movl $SYS_osigreturn,%eax 43152140Sluoqi pushl %eax /* junk to fake return addr. */ 43252140Sluoqi int $0x80 /* enter kernel with args */ 43352140Sluoqi0: jmp 0b 43490132Sbde#endif /* COMPAT_43 */ 43552140Sluoqi 43652140Sluoqi ALIGN_TEXT 43773011Sjakeesigcode: 43815392Sphk 43915392Sphk .data 44073011Sjake .globl szsigcode, szosigcode 44173011Sjakeszsigcode: 44273011Sjake .long esigcode-sigcode 44390132Sbde#ifdef COMPAT_43 44473011Sjakeszosigcode: 44573011Sjake .long esigcode-osigcode 44690132Sbde#endif 44715428Sphk .text 44815392Sphk 44915392Sphk/********************************************************************** 45015392Sphk * 45115392Sphk * Recover the bootinfo passed to us from the boot program 45215392Sphk * 45315392Sphk */ 45415392Sphkrecover_bootinfo: 45515392Sphk /* 4563284Srgrimes * This code is called in different ways depending on what loaded 4573284Srgrimes * and started the kernel. This is used to detect how we get the 4583284Srgrimes * arguments from the other code and what we do with them. 4593284Srgrimes * 4603284Srgrimes * Old disk boot blocks: 4613284Srgrimes * (*btext)(howto, bootdev, cyloffset, esym); 4623284Srgrimes * [return address == 0, and can NOT be returned to] 4633284Srgrimes * [cyloffset was not supported by the FreeBSD boot code 4643284Srgrimes * and always passed in as 0] 4653284Srgrimes * [esym is also known as total in the boot code, and 4663284Srgrimes * was never properly supported by the FreeBSD boot code] 4673284Srgrimes * 4683284Srgrimes * Old diskless netboot code: 4693284Srgrimes * (*btext)(0,0,0,0,&nfsdiskless,0,0,0); 4703284Srgrimes * [return address != 0, and can NOT be returned to] 4713284Srgrimes * If we are being booted by this code it will NOT work, 4723284Srgrimes * so we are just going to halt if we find this case. 4733284Srgrimes * 4743284Srgrimes * New uniform boot code: 4753284Srgrimes * (*btext)(howto, bootdev, 0, 0, 0, &bootinfo) 4763284Srgrimes * [return address != 0, and can be returned to] 4773284Srgrimes * 4783284Srgrimes * There may seem to be a lot of wasted arguments in here, but 4793384Srgrimes * that is so the newer boot code can still load very old kernels 4803384Srgrimes * and old boot code can load new kernels. 4814Srgrimes */ 4823284Srgrimes 4833284Srgrimes /* 4843284Srgrimes * The old style disk boot blocks fake a frame on the stack and 4853284Srgrimes * did an lret to get here. The frame on the stack has a return 4863284Srgrimes * address of 0. 4873284Srgrimes */ 4883384Srgrimes cmpl $0,4(%ebp) 48915392Sphk je olddiskboot 4903284Srgrimes 4913284Srgrimes /* 4923284Srgrimes * We have some form of return address, so this is either the 4933284Srgrimes * old diskless netboot code, or the new uniform code. That can 49415428Sphk * be detected by looking at the 5th argument, if it is 0 49515428Sphk * we are being booted by the new uniform boot code. 4963284Srgrimes */ 4973384Srgrimes cmpl $0,24(%ebp) 49815392Sphk je newboot 4993284Srgrimes 5003284Srgrimes /* 5013284Srgrimes * Seems we have been loaded by the old diskless boot code, we 5023284Srgrimes * don't stand a chance of running as the diskless structure 5033284Srgrimes * changed considerably between the two, so just halt. 5043284Srgrimes */ 5053284Srgrimes hlt 5063284Srgrimes 5073284Srgrimes /* 5083384Srgrimes * We have been loaded by the new uniform boot code. 50915428Sphk * Let's check the bootinfo version, and if we do not understand 5103384Srgrimes * it we return to the loader with a status of 1 to indicate this error 5113284Srgrimes */ 51215392Sphknewboot: 5133384Srgrimes movl 28(%ebp),%ebx /* &bootinfo.version */ 5145908Sbde movl BI_VERSION(%ebx),%eax 5153384Srgrimes cmpl $1,%eax /* We only understand version 1 */ 5163384Srgrimes je 1f 5173384Srgrimes movl $1,%eax /* Return status */ 5183384Srgrimes leave 51915428Sphk /* 52015428Sphk * XXX this returns to our caller's caller (as is required) since 52115428Sphk * we didn't set up a frame and our caller did. 52215428Sphk */ 5233384Srgrimes ret 5243284Srgrimes 5253384Srgrimes1: 5263284Srgrimes /* 5273384Srgrimes * If we have a kernelname copy it in 5283384Srgrimes */ 5295908Sbde movl BI_KERNELNAME(%ebx),%esi 5303384Srgrimes cmpl $0,%esi 5319344Sdg je 2f /* No kernelname */ 5329344Sdg movl $MAXPATHLEN,%ecx /* Brute force!!! */ 53373011Sjake movl $R(kernelname),%edi 5349344Sdg cmpb $'/',(%esi) /* Make sure it starts with a slash */ 5359344Sdg je 1f 5369344Sdg movb $'/',(%edi) 5379344Sdg incl %edi 5389344Sdg decl %ecx 5399344Sdg1: 5403384Srgrimes cld 5413384Srgrimes rep 5423384Srgrimes movsb 5433384Srgrimes 5449344Sdg2: 54515428Sphk /* 5465908Sbde * Determine the size of the boot loader's copy of the bootinfo 5475908Sbde * struct. This is impossible to do properly because old versions 5485908Sbde * of the struct don't contain a size field and there are 2 old 5495908Sbde * versions with the same version number. 5504600Sphk */ 5515908Sbde movl $BI_ENDCOMMON,%ecx /* prepare for sizeless version */ 5525908Sbde testl $RB_BOOTINFO,8(%ebp) /* bi_size (and bootinfo) valid? */ 5535908Sbde je got_bi_size /* no, sizeless version */ 5545908Sbde movl BI_SIZE(%ebx),%ecx 5555908Sbdegot_bi_size: 5565908Sbde 55715428Sphk /* 5585908Sbde * Copy the common part of the bootinfo struct 5595908Sbde */ 5604600Sphk movl %ebx,%esi 56173011Sjake movl $R(bootinfo),%edi 5625908Sbde cmpl $BOOTINFO_SIZE,%ecx 5635908Sbde jbe got_common_bi_size 5644600Sphk movl $BOOTINFO_SIZE,%ecx 5655908Sbdegot_common_bi_size: 5664600Sphk cld 5674600Sphk rep 5684600Sphk movsb 5694600Sphk 57038063Smsmith#ifdef NFS_ROOT 57125837Stegge#ifndef BOOTP_NFSV3 5723384Srgrimes /* 5733384Srgrimes * If we have a nfs_diskless structure copy it in 5743384Srgrimes */ 5755908Sbde movl BI_NFS_DISKLESS(%ebx),%esi 5763384Srgrimes cmpl $0,%esi 57715428Sphk je olddiskboot 57873011Sjake movl $R(nfs_diskless),%edi 5793384Srgrimes movl $NFSDISKLESS_SIZE,%ecx 5803384Srgrimes cld 5813384Srgrimes rep 5823384Srgrimes movsb 58373011Sjake movl $R(nfs_diskless_valid),%edi 5843795Sphk movl $1,(%edi) 5853406Sdg#endif 58625837Stegge#endif 5873384Srgrimes 5883384Srgrimes /* 5893284Srgrimes * The old style disk boot. 5903284Srgrimes * (*btext)(howto, bootdev, cyloffset, esym); 5913384Srgrimes * Note that the newer boot code just falls into here to pick 5923384Srgrimes * up howto and bootdev, cyloffset and esym are no longer used 5933284Srgrimes */ 59415392Sphkolddiskboot: 5953384Srgrimes movl 8(%ebp),%eax 59673011Sjake movl %eax,R(boothowto) 5973384Srgrimes movl 12(%ebp),%eax 59873011Sjake movl %eax,R(bootdev) 5992783Ssos 60015392Sphk ret 6013258Sdg 6021321Sdg 60315392Sphk/********************************************************************** 60415392Sphk * 60515392Sphk * Identify the CPU and initialize anything special about it 60615392Sphk * 60715392Sphk */ 60815392Sphkidentify_cpu: 60915392Sphk 6101998Swollman /* Try to toggle alignment check flag; does not exist on 386. */ 6111998Swollman pushfl 6121998Swollman popl %eax 6131998Swollman movl %eax,%ecx 6141998Swollman orl $PSL_AC,%eax 6151998Swollman pushl %eax 6161998Swollman popfl 6171998Swollman pushfl 6181998Swollman popl %eax 6191998Swollman xorl %ecx,%eax 6201998Swollman andl $PSL_AC,%eax 6211998Swollman pushl %ecx 6221998Swollman popfl 6231998Swollman 6241998Swollman testl %eax,%eax 62524112Skato jnz try486 62624112Skato 62724112Skato /* NexGen CPU does not have aligment check flag. */ 62824112Skato pushfl 62924112Skato movl $0x5555, %eax 63024112Skato xorl %edx, %edx 63124112Skato movl $2, %ecx 63224112Skato clc 63324112Skato divl %ecx 63424112Skato jz trynexgen 63524112Skato popfl 63673011Sjake movl $CPU_386,R(cpu) 63713081Sdg jmp 3f 6381998Swollman 63924112Skatotrynexgen: 64027424Skato popfl 64173011Sjake movl $CPU_NX586,R(cpu) 64273011Sjake movl $0x4778654e,R(cpu_vendor) # store vendor string 64373011Sjake movl $0x72446e65,R(cpu_vendor+4) 64473011Sjake movl $0x6e657669,R(cpu_vendor+8) 64573011Sjake movl $0,R(cpu_vendor+12) 64624112Skato jmp 3f 64724112Skato 64824112Skatotry486: /* Try to toggle identification flag; does not exist on early 486s. */ 6491998Swollman pushfl 6501998Swollman popl %eax 6511998Swollman movl %eax,%ecx 6521998Swollman xorl $PSL_ID,%eax 6531998Swollman pushl %eax 6541998Swollman popfl 6551998Swollman pushfl 6561998Swollman popl %eax 6571998Swollman xorl %ecx,%eax 6581998Swollman andl $PSL_ID,%eax 6591998Swollman pushl %ecx 6601998Swollman popfl 6611998Swollman 6621998Swollman testl %eax,%eax 66324112Skato jnz trycpuid 66473011Sjake movl $CPU_486,R(cpu) 6652495Spst 66624112Skato /* 66724112Skato * Check Cyrix CPU 66824112Skato * Cyrix CPUs do not change the undefined flags following 66924112Skato * execution of the divide instruction which divides 5 by 2. 67024112Skato * 67124112Skato * Note: CPUID is enabled on M2, so it passes another way. 67224112Skato */ 67324112Skato pushfl 67424112Skato movl $0x5555, %eax 67524112Skato xorl %edx, %edx 67624112Skato movl $2, %ecx 67724112Skato clc 67824112Skato divl %ecx 67924112Skato jnc trycyrix 68024112Skato popfl 68124112Skato jmp 3f /* You may use Intel CPU. */ 6822495Spst 68324112Skatotrycyrix: 68424112Skato popfl 68524112Skato /* 68624112Skato * IBM Bluelighting CPU also doesn't change the undefined flags. 68724112Skato * Because IBM doesn't disclose the information for Bluelighting 68824112Skato * CPU, we couldn't distinguish it from Cyrix's (including IBM 68924112Skato * brand of Cyrix CPUs). 69024112Skato */ 69173011Sjake movl $0x69727943,R(cpu_vendor) # store vendor string 69273011Sjake movl $0x736e4978,R(cpu_vendor+4) 69373011Sjake movl $0x64616574,R(cpu_vendor+8) 69413014Sdg jmp 3f 6951998Swollman 69624112Skatotrycpuid: /* Use the `cpuid' instruction. */ 6971998Swollman xorl %eax,%eax 69869006Smarkm cpuid # cpuid 0 69973011Sjake movl %eax,R(cpu_high) # highest capability 70073011Sjake movl %ebx,R(cpu_vendor) # store vendor string 70173011Sjake movl %edx,R(cpu_vendor+4) 70273011Sjake movl %ecx,R(cpu_vendor+8) 70373011Sjake movb $0,R(cpu_vendor+12) 7041998Swollman 7051998Swollman movl $1,%eax 70669006Smarkm cpuid # cpuid 1 70773011Sjake movl %eax,R(cpu_id) # store cpu_id 70873011Sjake movl %edx,R(cpu_feature) # store cpu_feature 7096308Sphk rorl $8,%eax # extract family type 7101998Swollman andl $15,%eax 7111998Swollman cmpl $5,%eax 7121998Swollman jae 1f 7131998Swollman 7141998Swollman /* less than Pentium; must be 486 */ 71573011Sjake movl $CPU_486,R(cpu) 71613000Sdg jmp 3f 71713000Sdg1: 71813000Sdg /* a Pentium? */ 71913000Sdg cmpl $5,%eax 72013000Sdg jne 2f 72173011Sjake movl $CPU_586,R(cpu) 72213000Sdg jmp 3f 723556Srgrimes2: 72413000Sdg /* Greater than Pentium...call it a Pentium Pro */ 72573011Sjake movl $CPU_686,R(cpu) 72613000Sdg3: 72715392Sphk ret 728556Srgrimes 7294Srgrimes 73015392Sphk/********************************************************************** 731570Srgrimes * 73215428Sphk * Create the first page directory and its page tables. 73315392Sphk * 734570Srgrimes */ 735570Srgrimes 73615392Sphkcreate_pagetables: 73715392Sphk 73815428Sphk/* Find end of kernel image (rounded up to a page boundary). */ 73915392Sphk movl $R(_end),%esi 7404Srgrimes 74161422Sbde/* Include symbols, if any. */ 74273011Sjake movl R(bootinfo+BI_ESYMTAB),%edi 7435908Sbde testl %edi,%edi 74415428Sphk je over_symalloc 7455908Sbde movl %edi,%esi 7465908Sbde movl $KERNBASE,%edi 74773011Sjake addl %edi,R(bootinfo+BI_SYMTAB) 74873011Sjake addl %edi,R(bootinfo+BI_ESYMTAB) 74915428Sphkover_symalloc: 7505908Sbde 75140081Smsmith/* If we are told where the end of the kernel space is, believe it. */ 75273011Sjake movl R(bootinfo+BI_KERNEND),%edi 75340081Smsmith testl %edi,%edi 75440081Smsmith je no_kernend 75540081Smsmith movl %edi,%esi 75640081Smsmithno_kernend: 75740081Smsmith 75815565Sphk addl $PAGE_MASK,%esi 75915565Sphk andl $~PAGE_MASK,%esi 76073011Sjake movl %esi,R(KERNend) /* save end of kernel */ 76115428Sphk movl %esi,R(physfree) /* next free page is at end of kernel */ 762608Srgrimes 76315392Sphk/* Allocate Kernel Page Tables */ 76415392Sphk ALLOCPAGES(NKPT) 76573011Sjake movl %esi,R(KPTphys) 766757Sdg 76715392Sphk/* Allocate Page Table Directory */ 76815392Sphk ALLOCPAGES(1) 76973011Sjake movl %esi,R(IdlePTD) 7704Srgrimes 77115392Sphk/* Allocate UPAGES */ 77283366Sjulian ALLOCPAGES(UAREA_PAGES) 77317120Sbde movl %esi,R(p0upa) 77415392Sphk addl $KERNBASE, %esi 77583366Sjulian movl %esi, R(proc0uarea) 7764Srgrimes 77783366Sjulian ALLOCPAGES(KSTACK_PAGES) 77883366Sjulian movl %esi,R(p0kpa) 77983366Sjulian addl $KERNBASE, %esi 78083366Sjulian movl %esi, R(proc0kstack) 78183366Sjulian 78237889Sjlemon ALLOCPAGES(1) /* vm86/bios stack */ 78337889Sjlemon movl %esi,R(vm86phystk) 78437889Sjlemon 78537889Sjlemon ALLOCPAGES(3) /* pgtable + ext + IOPAGES */ 78673011Sjake movl %esi,R(vm86pa) 78734840Sjlemon addl $KERNBASE, %esi 78873011Sjake movl %esi, R(vm86paddr) 78934840Sjlemon 79026812Speter#ifdef SMP 79125164Speter/* Allocate cpu0's private data page */ 79225164Speter ALLOCPAGES(1) 79325164Speter movl %esi,R(cpu0pp) 79425164Speter addl $KERNBASE, %esi 79573011Sjake movl %esi, R(cpu0prvpage) /* relocated to KVM space */ 79625164Speter 79746129Sluoqi/* Allocate SMP page table page */ 79825164Speter ALLOCPAGES(1) 79946129Sluoqi movl %esi,R(SMPptpa) 80025164Speter addl $KERNBASE, %esi 80173011Sjake movl %esi, R(SMPpt) /* relocated to KVM space */ 80226812Speter#endif /* SMP */ 80325164Speter 80415392Sphk/* Map read-only from zero to the end of the kernel text section */ 80515565Sphk xorl %eax, %eax 80615428Sphk#ifdef BDE_DEBUGGER 80715428Sphk/* If the debugger is present, actually map everything read-write. */ 80815428Sphk cmpl $0,R(_bdb_exists) 80915428Sphk jne map_read_write 81015428Sphk#endif 81119621Sdyson xorl %edx,%edx 81227484Sdyson 81327484Sdyson#if !defined(SMP) 81473011Sjake testl $CPUID_PGE, R(cpu_feature) 81519621Sdyson jz 2f 81619621Sdyson orl $PG_G,%edx 81727484Sdyson#endif 81819621Sdyson 81973011Sjake2: movl $R(etext),%ecx 82015565Sphk addl $PAGE_MASK,%ecx 82115565Sphk shrl $PAGE_SHIFT,%ecx 82219621Sdyson fillkptphys(%edx) 823757Sdg 82415392Sphk/* Map read-write, data, bss and symbols */ 82573011Sjake movl $R(etext),%eax 82615694Sphk addl $PAGE_MASK, %eax 82715694Sphk andl $~PAGE_MASK, %eax 82815428Sphkmap_read_write: 82919621Sdyson movl $PG_RW,%edx 83027484Sdyson#if !defined(SMP) 83173011Sjake testl $CPUID_PGE, R(cpu_feature) 83219621Sdyson jz 1f 83319621Sdyson orl $PG_G,%edx 83427484Sdyson#endif 83519621Sdyson 83673011Sjake1: movl R(KERNend),%ecx 837757Sdg subl %eax,%ecx 83815543Sphk shrl $PAGE_SHIFT,%ecx 83919621Sdyson fillkptphys(%edx) 840757Sdg 84115428Sphk/* Map page directory. */ 84273011Sjake movl R(IdlePTD), %eax 84315392Sphk movl $1, %ecx 84419621Sdyson fillkptphys($PG_RW) 845757Sdg 84617120Sbde/* Map proc0's UPAGES in the physical way ... */ 84717120Sbde movl R(p0upa), %eax 84883366Sjulian movl $(UAREA_PAGES), %ecx 84919621Sdyson fillkptphys($PG_RW) 8504Srgrimes 85183366Sjulian/* Map proc0's KSTACK in the physical way ... */ 85283366Sjulian movl R(p0kpa), %eax 85383366Sjulian movl $(KSTACK_PAGES), %ecx 85483366Sjulian fillkptphys($PG_RW) 85583366Sjulian 85615565Sphk/* Map ISA hole */ 85715565Sphk movl $ISA_HOLE_START, %eax 85815565Sphk movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 85922130Sdg fillkptphys($PG_RW) 86015565Sphk 86134840Sjlemon/* Map space for the vm86 region */ 86237889Sjlemon movl R(vm86phystk), %eax 86334840Sjlemon movl $4, %ecx 86434840Sjlemon fillkptphys($PG_RW) 86534840Sjlemon 86634840Sjlemon/* Map page 0 into the vm86 page table */ 86734840Sjlemon movl $0, %eax 86834840Sjlemon movl $0, %ebx 86934840Sjlemon movl $1, %ecx 87073011Sjake fillkpt(R(vm86pa), $PG_RW|PG_U) 87134840Sjlemon 87234840Sjlemon/* ...likewise for the ISA hole */ 87334840Sjlemon movl $ISA_HOLE_START, %eax 87434840Sjlemon movl $ISA_HOLE_START>>PAGE_SHIFT, %ebx 87534840Sjlemon movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 87673011Sjake fillkpt(R(vm86pa), $PG_RW|PG_U) 87734840Sjlemon 87826812Speter#ifdef SMP 87926812Speter/* Map cpu0's private page into global kmem (4K @ cpu0prvpage) */ 88025164Speter movl R(cpu0pp), %eax 88125164Speter movl $1, %ecx 88225164Speter fillkptphys($PG_RW) 88325164Speter 88446129Sluoqi/* Map SMP page table page into global kmem FWIW */ 88546129Sluoqi movl R(SMPptpa), %eax 88625164Speter movl $1, %ecx 88725164Speter fillkptphys($PG_RW) 88825164Speter 88946129Sluoqi/* Map the private page into the SMP page table */ 89025164Speter movl R(cpu0pp), %eax 89125164Speter movl $0, %ebx /* pte offset = 0 */ 89225164Speter movl $1, %ecx /* one private page coming right up */ 89346129Sluoqi fillkpt(R(SMPptpa), $PG_RW) 89425164Speter 89526812Speter/* ... and put the page table table in the pde. */ 89646129Sluoqi movl R(SMPptpa), %eax 89725164Speter movl $MPPTDI, %ebx 89825164Speter movl $1, %ecx 89973011Sjake fillkpt(R(IdlePTD), $PG_RW) 90034840Sjlemon 90134840Sjlemon/* Fakeup VA for the local apic to allow early traps. */ 90234840Sjlemon ALLOCPAGES(1) 90334840Sjlemon movl %esi, %eax 90446129Sluoqi movl $(NPTEPG-1), %ebx /* pte offset = NTEPG-1 */ 90534840Sjlemon movl $1, %ecx /* one private pt coming right up */ 90646129Sluoqi fillkpt(R(SMPptpa), $PG_RW) 90726812Speter#endif /* SMP */ 90825164Speter 90915392Sphk/* install a pde for temporary double map of bottom of VA */ 91073011Sjake movl R(KPTphys), %eax 91115565Sphk xorl %ebx, %ebx 91274283Speter movl $NKPT, %ecx 91373011Sjake fillkpt(R(IdlePTD), $PG_RW) 9144Srgrimes 91515392Sphk/* install pde's for pt's */ 91673011Sjake movl R(KPTphys), %eax 91715565Sphk movl $KPTDI, %ebx 91815565Sphk movl $NKPT, %ecx 91973011Sjake fillkpt(R(IdlePTD), $PG_RW) 9204Srgrimes 92115392Sphk/* install a pde recursively mapping page directory as a page table */ 92273011Sjake movl R(IdlePTD), %eax 92315565Sphk movl $PTDPTDI, %ebx 92415565Sphk movl $1,%ecx 92573011Sjake fillkpt(R(IdlePTD), $PG_RW) 9264Srgrimes 9274Srgrimes ret 92815428Sphk 92915428Sphk#ifdef BDE_DEBUGGER 93015428Sphkbdb_prepare_paging: 93115428Sphk cmpl $0,R(_bdb_exists) 93215428Sphk je bdb_prepare_paging_exit 93315428Sphk 93415428Sphk subl $6,%esp 93515428Sphk 93615428Sphk /* 93715428Sphk * Copy and convert debugger entries from the bootstrap gdt and idt 93815428Sphk * to the kernel gdt and idt. Everything is still in low memory. 93915428Sphk * Tracing continues to work after paging is enabled because the 94015428Sphk * low memory addresses remain valid until everything is relocated. 94115428Sphk * However, tracing through the setidt() that initializes the trace 94215428Sphk * trap will crash. 94315428Sphk */ 94415428Sphk sgdt (%esp) 94515428Sphk movl 2(%esp),%esi /* base address of bootstrap gdt */ 94615428Sphk movl $R(_gdt),%edi 94715428Sphk movl %edi,2(%esp) /* prepare to load kernel gdt */ 94815428Sphk movl $8*18/4,%ecx 94915428Sphk cld 95015428Sphk rep /* copy gdt */ 95115428Sphk movsl 95215428Sphk movl $R(_gdt),-8+2(%edi) /* adjust gdt self-ptr */ 95315428Sphk movb $0x92,-8+5(%edi) 95415428Sphk lgdt (%esp) 95515428Sphk 95615428Sphk sidt (%esp) 95715428Sphk movl 2(%esp),%esi /* base address of current idt */ 95815428Sphk movl 8+4(%esi),%eax /* convert dbg descriptor to ... */ 95915428Sphk movw 8(%esi),%ax 96015428Sphk movl %eax,R(bdb_dbg_ljmp+1) /* ... immediate offset ... */ 96115428Sphk movl 8+2(%esi),%eax 96215428Sphk movw %ax,R(bdb_dbg_ljmp+5) /* ... and selector for ljmp */ 96315428Sphk movl 24+4(%esi),%eax /* same for bpt descriptor */ 96415428Sphk movw 24(%esi),%ax 96515428Sphk movl %eax,R(bdb_bpt_ljmp+1) 96615428Sphk movl 24+2(%esi),%eax 96715428Sphk movw %ax,R(bdb_bpt_ljmp+5) 96848005Sbde movl R(_idt),%edi 96915428Sphk movl %edi,2(%esp) /* prepare to load kernel idt */ 97015428Sphk movl $8*4/4,%ecx 97115428Sphk cld 97215428Sphk rep /* copy idt */ 97315428Sphk movsl 97415428Sphk lidt (%esp) 97515428Sphk 97615428Sphk addl $6,%esp 97715428Sphk 97815428Sphkbdb_prepare_paging_exit: 97915428Sphk ret 98015428Sphk 98115428Sphk/* Relocate debugger gdt entries and gdt and idt pointers. */ 98215428Sphkbdb_commit_paging: 98315428Sphk cmpl $0,_bdb_exists 98415428Sphk je bdb_commit_paging_exit 98515428Sphk 98673011Sjake movl $gdt+8*9,%eax /* adjust slots 9-17 */ 98715428Sphk movl $9,%ecx 98815428Sphkreloc_gdt: 98915428Sphk movb $KERNBASE>>24,7(%eax) /* top byte of base addresses, was 0, */ 99015428Sphk addl $8,%eax /* now KERNBASE>>24 */ 99115428Sphk loop reloc_gdt 99215428Sphk 99315428Sphk subl $6,%esp 99415428Sphk sgdt (%esp) 99515428Sphk addl $KERNBASE,2(%esp) 99615428Sphk lgdt (%esp) 99715428Sphk sidt (%esp) 99815428Sphk addl $KERNBASE,2(%esp) 99915428Sphk lidt (%esp) 100015428Sphk addl $6,%esp 100115428Sphk 100215428Sphk int $3 100315428Sphk 100415428Sphkbdb_commit_paging_exit: 100515428Sphk ret 100615428Sphk 100715428Sphk#endif /* BDE_DEBUGGER */ 1008