locore.s revision 48005
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 3748005Sbde * $Id: locore.s,v 1.123 1999/06/01 18:19:39 jlemon Exp $ 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 4614835Sbde#include "apm.h" 4732358Seivind#include "opt_bootp.h" 4813228Swollman#include "opt_ddb.h" 4937272Sjmg#include "opt_nfsroot.h" 5018702Sjkh#include "opt_userconfig.h" 5114835Sbde 5214835Sbde#include <sys/syscall.h> 535908Sbde#include <sys/reboot.h> 544Srgrimes 5514835Sbde#include <machine/asmacros.h> 5614835Sbde#include <machine/cputypes.h> 5714835Sbde#include <machine/psl.h> 5815543Sphk#include <machine/pmap.h> 5914835Sbde#include <machine/specialreg.h> 6014835Sbde 6114835Sbde#include "assym.s" 6214835Sbde 634Srgrimes/* 64757Sdg * XXX 65757Sdg * 664Srgrimes * Note: This version greatly munged to avoid various assembler errors 674Srgrimes * that may be fixed in newer versions of gas. Perhaps newer versions 684Srgrimes * will have more pleasant appearance. 694Srgrimes */ 704Srgrimes 71200Sdg/* 724Srgrimes * PTmap is recursive pagemap at top of virtual address space. 734Srgrimes * Within PTmap, the page directory can be found (third indirection). 744Srgrimes */ 753861Sbde .globl _PTmap,_PTD,_PTDpde 7615543Sphk .set _PTmap,(PTDPTDI << PDRSHIFT) 7715543Sphk .set _PTD,_PTmap + (PTDPTDI * PAGE_SIZE) 78757Sdg .set _PTDpde,_PTD + (PTDPTDI * PDESIZE) 79592Srgrimes 803861Sbde/* 814Srgrimes * APTmap, APTD is the alternate recursive pagemap. 824Srgrimes * It's used when modifying another process's page tables. 834Srgrimes */ 84592Srgrimes .globl _APTmap,_APTD,_APTDpde 85592Srgrimes .set _APTmap,APTDPTDI << PDRSHIFT 8615543Sphk .set _APTD,_APTmap + (APTDPTDI * PAGE_SIZE) 87757Sdg .set _APTDpde,_PTD + (APTDPTDI * PDESIZE) 884Srgrimes 894Srgrimes/* 90556Srgrimes * Globals 91556Srgrimes */ 92556Srgrimes .data 9314835Sbde ALIGN_DATA /* just to be sure */ 94134Sdg 9525083Sjdp .globl HIDENAME(tmpstk) 9613729Sdg .space 0x2000 /* space for tmpstk - temporary stack */ 9725083SjdpHIDENAME(tmpstk): 983842Sdg 993861Sbde .globl _boothowto,_bootdev 100134Sdg 10115565Sphk .globl _cpu,_cpu_vendor,_cpu_id,_bootinfo 1026308Sphk .globl _cpu_high, _cpu_feature 1032783Ssos 10446129Sluoqi_cpu: .long 0 /* are we 386, 386sx, or 486 */ 1052216Sbde_cpu_id: .long 0 /* stepping ID */ 1066308Sphk_cpu_high: .long 0 /* highest arg to CPUID */ 1076308Sphk_cpu_feature: .long 0 /* features */ 1082216Sbde_cpu_vendor: .space 20 /* CPU origin code */ 1095908Sbde_bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */ 1104Srgrimes 111757Sdg_KERNend: .long 0 /* phys addr end of kernel (just after bss) */ 11215428Sphkphysfree: .long 0 /* phys addr of next free page */ 113757Sdg 11426812Speter#ifdef SMP 11546129Sluoqi .globl _cpu0prvpage 11625164Spetercpu0pp: .long 0 /* phys addr cpu0 private pg */ 11746129Sluoqi_cpu0prvpage: .long 0 /* relocated version */ 11825164Speter 11946129Sluoqi .globl _SMPpt 12046129SluoqiSMPptpa: .long 0 /* phys addr SMP page table */ 12146129Sluoqi_SMPpt: .long 0 /* relocated version */ 12226812Speter#endif /* SMP */ 12325164Speter 1243861Sbde .globl _IdlePTD 125757Sdg_IdlePTD: .long 0 /* phys addr of kernel PTD */ 1263861Sbde 12726812Speter#ifdef SMP 12826812Speter .globl _KPTphys 12926812Speter#endif 130757Sdg_KPTphys: .long 0 /* phys addr of kernel page tables */ 1314Srgrimes 132757Sdg .globl _proc0paddr 133757Sdg_proc0paddr: .long 0 /* address of proc 0 address space */ 13424693Speterp0upa: .long 0 /* phys addr of proc0's UPAGES */ 135134Sdg 13637889Sjlemonvm86phystk: .long 0 /* PA of vm86/bios stack */ 13737889Sjlemon 13834840Sjlemon .globl _vm86paddr, _vm86pa 13934840Sjlemon_vm86paddr: .long 0 /* address of vm86 region */ 14034840Sjlemon_vm86pa: .long 0 /* phys addr of vm86 region */ 14134840Sjlemon 14215428Sphk#ifdef BDE_DEBUGGER 14315428Sphk .globl _bdb_exists /* flag to indicate BDE debugger is present */ 14415428Sphk_bdb_exists: .long 0 14515428Sphk#endif 146718Swollman 14743434Skato#ifdef PC98 14843434Skato .globl _pc98_system_parameter 14943434Skato_pc98_system_parameter: 15043434Skato .space 0x240 15143434Skato#endif 15215428Sphk 15315392Sphk/********************************************************************** 15415392Sphk * 15515392Sphk * Some handy macros 15615392Sphk * 157556Srgrimes */ 158134Sdg 15915392Sphk#define R(foo) ((foo)-KERNBASE) 16015392Sphk 16115392Sphk#define ALLOCPAGES(foo) \ 16215392Sphk movl R(physfree), %esi ; \ 16315543Sphk movl $((foo)*PAGE_SIZE), %eax ; \ 16415392Sphk addl %esi, %eax ; \ 16515392Sphk movl %eax, R(physfree) ; \ 16615392Sphk movl %esi, %edi ; \ 16715543Sphk movl $((foo)*PAGE_SIZE),%ecx ; \ 16815392Sphk xorl %eax,%eax ; \ 16915428Sphk cld ; \ 17015428Sphk rep ; \ 17115428Sphk stosb 17215392Sphk 173134Sdg/* 17415392Sphk * fillkpt 17515565Sphk * eax = page frame address 17615565Sphk * ebx = index into page table 17715392Sphk * ecx = how many pages to map 17815565Sphk * base = base address of page dir/table 17915565Sphk * prot = protection bits 180134Sdg */ 18115565Sphk#define fillkpt(base, prot) \ 18219621Sdyson shll $2,%ebx ; \ 18319621Sdyson addl base,%ebx ; \ 18419621Sdyson orl $PG_V,%eax ; \ 18519621Sdyson orl prot,%eax ; \ 18615565Sphk1: movl %eax,(%ebx) ; \ 18715565Sphk addl $PAGE_SIZE,%eax ; /* increment physical address */ \ 18815565Sphk addl $4,%ebx ; /* next pte */ \ 18915428Sphk loop 1b 19015392Sphk 19115565Sphk/* 19215565Sphk * fillkptphys(prot) 19315565Sphk * eax = physical address 19415565Sphk * ecx = how many pages to map 19515565Sphk * prot = protection bits 19615565Sphk */ 19715565Sphk#define fillkptphys(prot) \ 19815565Sphk movl %eax, %ebx ; \ 19915565Sphk shrl $PAGE_SHIFT, %ebx ; \ 20015565Sphk fillkpt(R(_KPTphys), prot) 20115565Sphk 20215392Sphk .text 20315392Sphk/********************************************************************** 20415392Sphk * 20515392Sphk * This is where the bootblocks start us, set the ball rolling... 20615392Sphk * 20715392Sphk */ 2081321SdgNON_GPROF_ENTRY(btext) 2094Srgrimes 21024112Skato#ifdef PC98 21124112Skato /* save SYSTEM PARAMETER for resume (NS/T or other) */ 21243434Skato movl $0xa1400,%esi 21343434Skato movl $R(_pc98_system_parameter),%edi 21443434Skato movl $0x0240,%ecx 21524112Skato cld 21624112Skato rep 21724112Skato movsb 21824112Skato#else /* IBM-PC */ 21915428Sphk#ifdef BDE_DEBUGGER 22015428Sphk#ifdef BIOS_STEALS_3K 22115428Sphk cmpl $0x0375c339,0x95504 22215428Sphk#else 22315428Sphk cmpl $0x0375c339,0x96104 /* XXX - debugger signature */ 22415428Sphk#endif 22515428Sphk jne 1f 22615428Sphk movb $1,R(_bdb_exists) 22715428Sphk1: 22815428Sphk#endif 22940179Skato#endif /* PC98 */ 23015428Sphk 23115392Sphk/* Tell the bios to warmboot next time */ 23215392Sphk movw $0x1234,0x472 23315392Sphk 23415428Sphk/* Set up a real frame in case the double return in newboot is executed. */ 2353384Srgrimes pushl %ebp 2363384Srgrimes movl %esp, %ebp 2373384Srgrimes 23815392Sphk/* Don't trust what the BIOS gives for eflags. */ 2395603Sbde pushl $PSL_KERNEL 2402486Sdg popfl 24115428Sphk 24215428Sphk/* 24315428Sphk * Don't trust what the BIOS gives for %fs and %gs. Trust the bootstrap 24415428Sphk * to set %cs, %ds, %es and %ss. 24515428Sphk */ 24615428Sphk mov %ds, %ax 2474217Sphk mov %ax, %fs 2484217Sphk mov %ax, %gs 2494217Sphk 25015392Sphk call recover_bootinfo 25115392Sphk 25215428Sphk/* Get onto a stack that we can trust. */ 25315428Sphk/* 25415428Sphk * XXX this step is delayed in case recover_bootinfo needs to return via 25515428Sphk * the old stack, but it need not be, since recover_bootinfo actually 25615428Sphk * returns via the old frame. 25715428Sphk */ 25825083Sjdp movl $R(HIDENAME(tmpstk)),%esp 25915392Sphk 26024112Skato#ifdef PC98 26143447Skato /* pc98_machine_type & M_EPSON_PC98 */ 26243447Skato testb $0x02,R(_pc98_system_parameter)+220 26324112Skato jz 3f 26443447Skato /* epson_machine_id <= 0x0b */ 26543447Skato cmpb $0x0b,R(_pc98_system_parameter)+224 26624112Skato ja 3f 26724112Skato 26824112Skato /* count up memory */ 26924112Skato movl $0x100000,%eax /* next, talley remaining memory */ 27024112Skato movl $0xFFF-0x100,%ecx 27124112Skato1: movl 0(%eax),%ebx /* save location to check */ 27224112Skato movl $0xa55a5aa5,0(%eax) /* write test pattern */ 27324112Skato cmpl $0xa55a5aa5,0(%eax) /* does not check yet for rollover */ 27424112Skato jne 2f 27524112Skato movl %ebx,0(%eax) /* restore memory */ 27624112Skato addl $PAGE_SIZE,%eax 27724112Skato loop 1b 27824112Skato2: subl $0x100000,%eax 27924112Skato shrl $17,%eax 28043447Skato movb %al,R(_pc98_system_parameter)+1 28124112Skato3: 28224112Skato#endif 28324112Skato 28415392Sphk call identify_cpu 28515392Sphk 28615392Sphk/* clear bss */ 28715428Sphk/* 28817120Sbde * XXX this should be done a little earlier. 28915428Sphk * 29017120Sbde * XXX we don't check that there is memory for our bss and page tables 29117120Sbde * before using it. 29215428Sphk * 29315428Sphk * XXX the boot program somewhat bogusly clears the bss. We still have 29415428Sphk * to do it in case we were unzipped by kzipboot. Then the boot program 29515428Sphk * only clears kzipboot's bss. 29615428Sphk * 29715428Sphk * XXX the gdt and idt are still somewhere in the boot program. We 29815428Sphk * depend on the convention that the boot program is below 1MB and we 29915428Sphk * are above 1MB to keep the gdt and idt away from the bss and page 30017120Sbde * tables. The idt is only used if BDE_DEBUGGER is enabled. 30115428Sphk */ 30215392Sphk movl $R(_end),%ecx 30315392Sphk movl $R(_edata),%edi 30415392Sphk subl %edi,%ecx 30515392Sphk xorl %eax,%eax 30615428Sphk cld 30715428Sphk rep 30815428Sphk stosb 30915392Sphk 31015392Sphk#if NAPM > 0 31115428Sphk#endif 31215392Sphk 31315392Sphk call create_pagetables 31415392Sphk 31527993Sdyson/* 31627993Sdyson * If the CPU has support for VME, turn it on. 31727993Sdyson */ 31827993Sdyson testl $CPUID_VME, R(_cpu_feature) 31927993Sdyson jz 1f 32027993Sdyson movl %cr4, %eax 32127993Sdyson orl $CR4_VME, %eax 32227993Sdyson movl %eax, %cr4 32327993Sdyson1: 32427993Sdyson 32515428Sphk#ifdef BDE_DEBUGGER 32615428Sphk/* 32715428Sphk * Adjust as much as possible for paging before enabling paging so that the 32815428Sphk * adjustments can be traced. 32915428Sphk */ 33015428Sphk call bdb_prepare_paging 33115428Sphk#endif 33215428Sphk 33315392Sphk/* Now enable paging */ 33415392Sphk movl R(_IdlePTD), %eax 33515392Sphk movl %eax,%cr3 /* load ptd addr into mmu */ 33615392Sphk movl %cr0,%eax /* get control word */ 33715392Sphk orl $CR0_PE|CR0_PG,%eax /* enable paging */ 33815392Sphk movl %eax,%cr0 /* and let's page NOW! */ 33915392Sphk 34015428Sphk#ifdef BDE_DEBUGGER 34115428Sphk/* 34215428Sphk * Complete the adjustments for paging so that we can keep tracing through 34317120Sbde * initi386() after the low (physical) addresses for the gdt and idt become 34415428Sphk * invalid. 34515428Sphk */ 34615428Sphk call bdb_commit_paging 34715428Sphk#endif 34815428Sphk 34915428Sphk pushl $begin /* jump to high virtualized address */ 35015392Sphk ret 35115392Sphk 35215392Sphk/* now running relocated at KERNBASE where the system is linked to run */ 35315392Sphkbegin: 35415392Sphk /* set up bootstrap stack */ 35524691Speter movl _proc0paddr,%esp /* location of in-kernel pages */ 35624691Speter addl $UPAGES*PAGE_SIZE,%esp /* bootstrap stack end location */ 35715392Sphk xorl %eax,%eax /* mark end of frames */ 35815392Sphk movl %eax,%ebp 35915392Sphk movl _proc0paddr,%eax 36015392Sphk movl _IdlePTD, %esi 36115392Sphk movl %esi,PCB_CR3(%eax) 36215392Sphk 36315392Sphk movl physfree, %esi 36415392Sphk pushl %esi /* value of first for init386(first) */ 36515392Sphk call _init386 /* wire 386 chip for unix operation */ 36615392Sphk popl %esi 36715392Sphk 36815392Sphk .globl __ucodesel,__udatasel 36915392Sphk 37015392Sphk pushl $0 /* unused */ 37115392Sphk pushl __udatasel /* ss */ 37215392Sphk pushl $0 /* esp - filled in by execve() */ 37315392Sphk pushl $PSL_USER /* eflags (IOPL 0, int enab) */ 37415392Sphk pushl __ucodesel /* cs */ 37515392Sphk pushl $0 /* eip - filled in by execve() */ 37646129Sluoqi subl $(13*4),%esp /* space for rest of registers */ 37715392Sphk 37815392Sphk pushl %esp /* call main with frame pointer */ 37946823Speter call _mi_startup /* autoconfiguration, mountroot etc */ 38015392Sphk 38124691Speter hlt /* never returns to here */ 38215392Sphk 38324691Speter/* 38424691Speter * When starting init, call this to configure the process for user 38524691Speter * mode. This will be inherited by other processes. 38624691Speter */ 38724691SpeterNON_GPROF_ENTRY(prepare_usermode) 38815392Sphk /* 38924112Skato * Now we've run main() and determined what cpu-type we are, we can 39015392Sphk * enable write protection and alignment checking on i486 cpus and 39115392Sphk * above. 39215392Sphk */ 39315392Sphk#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU) 39415392Sphk cmpl $CPUCLASS_386,_cpu_class 39515392Sphk je 1f 39615392Sphk movl %cr0,%eax /* get control word */ 39715392Sphk orl $CR0_WP|CR0_AM,%eax /* enable i486 features */ 39815392Sphk movl %eax,%cr0 /* and do it */ 39915428Sphk1: 40015392Sphk#endif 40115392Sphk /* 40215392Sphk * on return from main(), we are process 1 40315392Sphk * set up address space and stack so that we can 'return' to user mode 40415392Sphk */ 40515392Sphk movl __ucodesel,%eax 40615392Sphk movl __udatasel,%ecx 40715392Sphk 40846129Sluoqi#if 0 /* ds/es/fs are in trap frame */ 40915392Sphk movl %cx,%ds 41046129Sluoqi movl %cx,%es 41146129Sluoqi movl %cx,%fs 41224691Speter#endif 41315392Sphk movl %cx,%gs /* and ds to gs */ 41424691Speter ret /* goto user! */ 41515392Sphk 41624691Speter 41715392Sphk#define LCALL(x,y) .byte 0x9a ; .long y ; .word x 41815392Sphk 41915392Sphk/* 42015392Sphk * Signal trampoline, copied to top of user stack 42115392Sphk */ 42215392SphkNON_GPROF_ENTRY(sigcode) 42315392Sphk call SIGF_HANDLER(%esp) 42415392Sphk lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */ 42515392Sphk /* copy at 8(%esp)) */ 42615392Sphk pushl %eax 42715392Sphk pushl %eax /* junk to fake return address */ 42815392Sphk movl $SYS_sigreturn,%eax /* sigreturn() */ 42915392Sphk LCALL(0x7,0) /* enter kernel with args on stack */ 43015392Sphk hlt /* never gets here */ 43125083Sjdp ALIGN_TEXT 43215392Sphk_esigcode: 43315392Sphk 43415392Sphk .data 43515392Sphk .globl _szsigcode 43615392Sphk_szsigcode: 43715392Sphk .long _esigcode-_sigcode 43815428Sphk .text 43915392Sphk 44015392Sphk/********************************************************************** 44115392Sphk * 44215392Sphk * Recover the bootinfo passed to us from the boot program 44315392Sphk * 44415392Sphk */ 44515392Sphkrecover_bootinfo: 44615392Sphk /* 4473284Srgrimes * This code is called in different ways depending on what loaded 4483284Srgrimes * and started the kernel. This is used to detect how we get the 4493284Srgrimes * arguments from the other code and what we do with them. 4503284Srgrimes * 4513284Srgrimes * Old disk boot blocks: 4523284Srgrimes * (*btext)(howto, bootdev, cyloffset, esym); 4533284Srgrimes * [return address == 0, and can NOT be returned to] 4543284Srgrimes * [cyloffset was not supported by the FreeBSD boot code 4553284Srgrimes * and always passed in as 0] 4563284Srgrimes * [esym is also known as total in the boot code, and 4573284Srgrimes * was never properly supported by the FreeBSD boot code] 4583284Srgrimes * 4593284Srgrimes * Old diskless netboot code: 4603284Srgrimes * (*btext)(0,0,0,0,&nfsdiskless,0,0,0); 4613284Srgrimes * [return address != 0, and can NOT be returned to] 4623284Srgrimes * If we are being booted by this code it will NOT work, 4633284Srgrimes * so we are just going to halt if we find this case. 4643284Srgrimes * 4653284Srgrimes * New uniform boot code: 4663284Srgrimes * (*btext)(howto, bootdev, 0, 0, 0, &bootinfo) 4673284Srgrimes * [return address != 0, and can be returned to] 4683284Srgrimes * 4693284Srgrimes * There may seem to be a lot of wasted arguments in here, but 4703384Srgrimes * that is so the newer boot code can still load very old kernels 4713384Srgrimes * and old boot code can load new kernels. 4724Srgrimes */ 4733284Srgrimes 4743284Srgrimes /* 4753284Srgrimes * The old style disk boot blocks fake a frame on the stack and 4763284Srgrimes * did an lret to get here. The frame on the stack has a return 4773284Srgrimes * address of 0. 4783284Srgrimes */ 4793384Srgrimes cmpl $0,4(%ebp) 48015392Sphk je olddiskboot 4813284Srgrimes 4823284Srgrimes /* 4833284Srgrimes * We have some form of return address, so this is either the 4843284Srgrimes * old diskless netboot code, or the new uniform code. That can 48515428Sphk * be detected by looking at the 5th argument, if it is 0 48615428Sphk * we are being booted by the new uniform boot code. 4873284Srgrimes */ 4883384Srgrimes cmpl $0,24(%ebp) 48915392Sphk je newboot 4903284Srgrimes 4913284Srgrimes /* 4923284Srgrimes * Seems we have been loaded by the old diskless boot code, we 4933284Srgrimes * don't stand a chance of running as the diskless structure 4943284Srgrimes * changed considerably between the two, so just halt. 4953284Srgrimes */ 4963284Srgrimes hlt 4973284Srgrimes 4983284Srgrimes /* 4993384Srgrimes * We have been loaded by the new uniform boot code. 50015428Sphk * Let's check the bootinfo version, and if we do not understand 5013384Srgrimes * it we return to the loader with a status of 1 to indicate this error 5023284Srgrimes */ 50315392Sphknewboot: 5043384Srgrimes movl 28(%ebp),%ebx /* &bootinfo.version */ 5055908Sbde movl BI_VERSION(%ebx),%eax 5063384Srgrimes cmpl $1,%eax /* We only understand version 1 */ 5073384Srgrimes je 1f 5083384Srgrimes movl $1,%eax /* Return status */ 5093384Srgrimes leave 51015428Sphk /* 51115428Sphk * XXX this returns to our caller's caller (as is required) since 51215428Sphk * we didn't set up a frame and our caller did. 51315428Sphk */ 5143384Srgrimes ret 5153284Srgrimes 5163384Srgrimes1: 5173284Srgrimes /* 5183384Srgrimes * If we have a kernelname copy it in 5193384Srgrimes */ 5205908Sbde movl BI_KERNELNAME(%ebx),%esi 5213384Srgrimes cmpl $0,%esi 5229344Sdg je 2f /* No kernelname */ 5239344Sdg movl $MAXPATHLEN,%ecx /* Brute force!!! */ 52415926Sphk movl $R(_kernelname),%edi 5259344Sdg cmpb $'/',(%esi) /* Make sure it starts with a slash */ 5269344Sdg je 1f 5279344Sdg movb $'/',(%edi) 5289344Sdg incl %edi 5299344Sdg decl %ecx 5309344Sdg1: 5313384Srgrimes cld 5323384Srgrimes rep 5333384Srgrimes movsb 5343384Srgrimes 5359344Sdg2: 53615428Sphk /* 5375908Sbde * Determine the size of the boot loader's copy of the bootinfo 5385908Sbde * struct. This is impossible to do properly because old versions 5395908Sbde * of the struct don't contain a size field and there are 2 old 5405908Sbde * versions with the same version number. 5414600Sphk */ 5425908Sbde movl $BI_ENDCOMMON,%ecx /* prepare for sizeless version */ 5435908Sbde testl $RB_BOOTINFO,8(%ebp) /* bi_size (and bootinfo) valid? */ 5445908Sbde je got_bi_size /* no, sizeless version */ 5455908Sbde movl BI_SIZE(%ebx),%ecx 5465908Sbdegot_bi_size: 5475908Sbde 54815428Sphk /* 5495908Sbde * Copy the common part of the bootinfo struct 5505908Sbde */ 5514600Sphk movl %ebx,%esi 55215926Sphk movl $R(_bootinfo),%edi 5535908Sbde cmpl $BOOTINFO_SIZE,%ecx 5545908Sbde jbe got_common_bi_size 5554600Sphk movl $BOOTINFO_SIZE,%ecx 5565908Sbdegot_common_bi_size: 5574600Sphk cld 5584600Sphk rep 5594600Sphk movsb 5604600Sphk 56138063Smsmith#ifdef NFS_ROOT 56225837Stegge#ifndef BOOTP_NFSV3 5633384Srgrimes /* 5643384Srgrimes * If we have a nfs_diskless structure copy it in 5653384Srgrimes */ 5665908Sbde movl BI_NFS_DISKLESS(%ebx),%esi 5673384Srgrimes cmpl $0,%esi 56815428Sphk je olddiskboot 56915926Sphk movl $R(_nfs_diskless),%edi 5703384Srgrimes movl $NFSDISKLESS_SIZE,%ecx 5713384Srgrimes cld 5723384Srgrimes rep 5733384Srgrimes movsb 57415926Sphk movl $R(_nfs_diskless_valid),%edi 5753795Sphk movl $1,(%edi) 5763406Sdg#endif 57725837Stegge#endif 5783384Srgrimes 5793384Srgrimes /* 5803284Srgrimes * The old style disk boot. 5813284Srgrimes * (*btext)(howto, bootdev, cyloffset, esym); 5823384Srgrimes * Note that the newer boot code just falls into here to pick 5833384Srgrimes * up howto and bootdev, cyloffset and esym are no longer used 5843284Srgrimes */ 58515392Sphkolddiskboot: 5863384Srgrimes movl 8(%ebp),%eax 58715926Sphk movl %eax,R(_boothowto) 5883384Srgrimes movl 12(%ebp),%eax 58915926Sphk movl %eax,R(_bootdev) 5902783Ssos 59115392Sphk ret 5923258Sdg 5931321Sdg 59415392Sphk/********************************************************************** 59515392Sphk * 59615392Sphk * Identify the CPU and initialize anything special about it 59715392Sphk * 59815392Sphk */ 59915392Sphkidentify_cpu: 60015392Sphk 6011998Swollman /* Try to toggle alignment check flag; does not exist on 386. */ 6021998Swollman pushfl 6031998Swollman popl %eax 6041998Swollman movl %eax,%ecx 6051998Swollman orl $PSL_AC,%eax 6061998Swollman pushl %eax 6071998Swollman popfl 6081998Swollman pushfl 6091998Swollman popl %eax 6101998Swollman xorl %ecx,%eax 6111998Swollman andl $PSL_AC,%eax 6121998Swollman pushl %ecx 6131998Swollman popfl 6141998Swollman 6151998Swollman testl %eax,%eax 61624112Skato jnz try486 61724112Skato 61824112Skato /* NexGen CPU does not have aligment check flag. */ 61924112Skato pushfl 62024112Skato movl $0x5555, %eax 62124112Skato xorl %edx, %edx 62224112Skato movl $2, %ecx 62324112Skato clc 62424112Skato divl %ecx 62524112Skato jz trynexgen 62624112Skato popfl 62715926Sphk movl $CPU_386,R(_cpu) 62813081Sdg jmp 3f 6291998Swollman 63024112Skatotrynexgen: 63127424Skato popfl 63224112Skato movl $CPU_NX586,R(_cpu) 63324112Skato movl $0x4778654e,R(_cpu_vendor) # store vendor string 63424112Skato movl $0x72446e65,R(_cpu_vendor+4) 63524112Skato movl $0x6e657669,R(_cpu_vendor+8) 63624112Skato movl $0,R(_cpu_vendor+12) 63724112Skato jmp 3f 63824112Skato 63924112Skatotry486: /* Try to toggle identification flag; does not exist on early 486s. */ 6401998Swollman pushfl 6411998Swollman popl %eax 6421998Swollman movl %eax,%ecx 6431998Swollman xorl $PSL_ID,%eax 6441998Swollman pushl %eax 6451998Swollman popfl 6461998Swollman pushfl 6471998Swollman popl %eax 6481998Swollman xorl %ecx,%eax 6491998Swollman andl $PSL_ID,%eax 6501998Swollman pushl %ecx 6511998Swollman popfl 6521998Swollman 6531998Swollman testl %eax,%eax 65424112Skato jnz trycpuid 65515926Sphk movl $CPU_486,R(_cpu) 6562495Spst 65724112Skato /* 65824112Skato * Check Cyrix CPU 65924112Skato * Cyrix CPUs do not change the undefined flags following 66024112Skato * execution of the divide instruction which divides 5 by 2. 66124112Skato * 66224112Skato * Note: CPUID is enabled on M2, so it passes another way. 66324112Skato */ 66424112Skato pushfl 66524112Skato movl $0x5555, %eax 66624112Skato xorl %edx, %edx 66724112Skato movl $2, %ecx 66824112Skato clc 66924112Skato divl %ecx 67024112Skato jnc trycyrix 67124112Skato popfl 67224112Skato jmp 3f /* You may use Intel CPU. */ 6732495Spst 67424112Skatotrycyrix: 67524112Skato popfl 67624112Skato /* 67724112Skato * IBM Bluelighting CPU also doesn't change the undefined flags. 67824112Skato * Because IBM doesn't disclose the information for Bluelighting 67924112Skato * CPU, we couldn't distinguish it from Cyrix's (including IBM 68024112Skato * brand of Cyrix CPUs). 68124112Skato */ 68215926Sphk movl $0x69727943,R(_cpu_vendor) # store vendor string 68324112Skato movl $0x736e4978,R(_cpu_vendor+4) 68424112Skato movl $0x64616574,R(_cpu_vendor+8) 68513014Sdg jmp 3f 6861998Swollman 68724112Skatotrycpuid: /* Use the `cpuid' instruction. */ 6881998Swollman xorl %eax,%eax 6896308Sphk .byte 0x0f,0xa2 # cpuid 0 69015926Sphk movl %eax,R(_cpu_high) # highest capability 69115926Sphk movl %ebx,R(_cpu_vendor) # store vendor string 69215926Sphk movl %edx,R(_cpu_vendor+4) 69315926Sphk movl %ecx,R(_cpu_vendor+8) 69415926Sphk movb $0,R(_cpu_vendor+12) 6951998Swollman 6961998Swollman movl $1,%eax 6976308Sphk .byte 0x0f,0xa2 # cpuid 1 69815926Sphk movl %eax,R(_cpu_id) # store cpu_id 69915926Sphk movl %edx,R(_cpu_feature) # store cpu_feature 7006308Sphk rorl $8,%eax # extract family type 7011998Swollman andl $15,%eax 7021998Swollman cmpl $5,%eax 7031998Swollman jae 1f 7041998Swollman 7051998Swollman /* less than Pentium; must be 486 */ 70615926Sphk movl $CPU_486,R(_cpu) 70713000Sdg jmp 3f 70813000Sdg1: 70913000Sdg /* a Pentium? */ 71013000Sdg cmpl $5,%eax 71113000Sdg jne 2f 71215926Sphk movl $CPU_586,R(_cpu) 71313000Sdg jmp 3f 714556Srgrimes2: 71513000Sdg /* Greater than Pentium...call it a Pentium Pro */ 71615926Sphk movl $CPU_686,R(_cpu) 71713000Sdg3: 71815392Sphk ret 719556Srgrimes 7204Srgrimes 72115392Sphk/********************************************************************** 722570Srgrimes * 72315428Sphk * Create the first page directory and its page tables. 72415392Sphk * 725570Srgrimes */ 726570Srgrimes 72715392Sphkcreate_pagetables: 72815392Sphk 72919621Sdyson testl $CPUID_PGE, R(_cpu_feature) 73019621Sdyson jz 1f 73119621Sdyson movl %cr4, %eax 73219621Sdyson orl $CR4_PGE, %eax 73319621Sdyson movl %eax, %cr4 73419621Sdyson1: 73519621Sdyson 73615428Sphk/* Find end of kernel image (rounded up to a page boundary). */ 73715392Sphk movl $R(_end),%esi 7384Srgrimes 73940081Smsmith/* include symbols if loaded and useful */ 7405908Sbde#ifdef DDB 74115392Sphk movl R(_bootinfo+BI_ESYMTAB),%edi 7425908Sbde testl %edi,%edi 74315428Sphk je over_symalloc 7445908Sbde movl %edi,%esi 7455908Sbde movl $KERNBASE,%edi 74615392Sphk addl %edi,R(_bootinfo+BI_SYMTAB) 74715392Sphk addl %edi,R(_bootinfo+BI_ESYMTAB) 74815428Sphkover_symalloc: 7495908Sbde#endif 7505908Sbde 75140081Smsmith/* If we are told where the end of the kernel space is, believe it. */ 75240081Smsmith 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 76015392Sphk 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) 76515392Sphk movl %esi,R(_KPTphys) 766757Sdg 76715392Sphk/* Allocate Page Table Directory */ 76815392Sphk ALLOCPAGES(1) 76915392Sphk movl %esi,R(_IdlePTD) 7704Srgrimes 77115392Sphk/* Allocate UPAGES */ 77215392Sphk ALLOCPAGES(UPAGES) 77317120Sbde movl %esi,R(p0upa) 77415392Sphk addl $KERNBASE, %esi 77515392Sphk movl %esi, R(_proc0paddr) 7764Srgrimes 77737889Sjlemon ALLOCPAGES(1) /* vm86/bios stack */ 77837889Sjlemon movl %esi,R(vm86phystk) 77937889Sjlemon 78037889Sjlemon ALLOCPAGES(3) /* pgtable + ext + IOPAGES */ 78134840Sjlemon movl %esi,R(_vm86pa) 78234840Sjlemon addl $KERNBASE, %esi 78334840Sjlemon movl %esi, R(_vm86paddr) 78434840Sjlemon 78526812Speter#ifdef SMP 78625164Speter/* Allocate cpu0's private data page */ 78725164Speter ALLOCPAGES(1) 78825164Speter movl %esi,R(cpu0pp) 78925164Speter addl $KERNBASE, %esi 79025164Speter movl %esi, R(_cpu0prvpage) /* relocated to KVM space */ 79125164Speter 79246129Sluoqi/* Allocate SMP page table page */ 79325164Speter ALLOCPAGES(1) 79446129Sluoqi movl %esi,R(SMPptpa) 79525164Speter addl $KERNBASE, %esi 79646129Sluoqi movl %esi, R(_SMPpt) /* relocated to KVM space */ 79726812Speter#endif /* SMP */ 79825164Speter 79915392Sphk/* Map read-only from zero to the end of the kernel text section */ 80015565Sphk xorl %eax, %eax 80115428Sphk#ifdef BDE_DEBUGGER 80215428Sphk/* If the debugger is present, actually map everything read-write. */ 80315428Sphk cmpl $0,R(_bdb_exists) 80415428Sphk jne map_read_write 80515428Sphk#endif 80619621Sdyson xorl %edx,%edx 80727484Sdyson 80827484Sdyson#if !defined(SMP) 80919621Sdyson testl $CPUID_PGE, R(_cpu_feature) 81019621Sdyson jz 2f 81119621Sdyson orl $PG_G,%edx 81227484Sdyson#endif 81319621Sdyson 81419621Sdyson2: movl $R(_etext),%ecx 81515565Sphk addl $PAGE_MASK,%ecx 81615565Sphk shrl $PAGE_SHIFT,%ecx 81719621Sdyson fillkptphys(%edx) 818757Sdg 81915392Sphk/* Map read-write, data, bss and symbols */ 82015565Sphk movl $R(_etext),%eax 82115694Sphk addl $PAGE_MASK, %eax 82215694Sphk andl $~PAGE_MASK, %eax 82315428Sphkmap_read_write: 82419621Sdyson movl $PG_RW,%edx 82527484Sdyson#if !defined(SMP) 82619621Sdyson testl $CPUID_PGE, R(_cpu_feature) 82719621Sdyson jz 1f 82819621Sdyson orl $PG_G,%edx 82927484Sdyson#endif 83019621Sdyson 83119621Sdyson1: movl R(_KERNend),%ecx 832757Sdg subl %eax,%ecx 83315543Sphk shrl $PAGE_SHIFT,%ecx 83419621Sdyson fillkptphys(%edx) 835757Sdg 83615428Sphk/* Map page directory. */ 83715392Sphk movl R(_IdlePTD), %eax 83815392Sphk movl $1, %ecx 83919621Sdyson fillkptphys($PG_RW) 840757Sdg 84117120Sbde/* Map proc0's UPAGES in the physical way ... */ 84217120Sbde movl R(p0upa), %eax 84315392Sphk movl $UPAGES, %ecx 84419621Sdyson fillkptphys($PG_RW) 8454Srgrimes 84615565Sphk/* Map ISA hole */ 84715565Sphk movl $ISA_HOLE_START, %eax 84815565Sphk movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 84922130Sdg fillkptphys($PG_RW) 85015565Sphk 85134840Sjlemon/* Map space for the vm86 region */ 85237889Sjlemon movl R(vm86phystk), %eax 85334840Sjlemon movl $4, %ecx 85434840Sjlemon fillkptphys($PG_RW) 85534840Sjlemon 85634840Sjlemon/* Map page 0 into the vm86 page table */ 85734840Sjlemon movl $0, %eax 85834840Sjlemon movl $0, %ebx 85934840Sjlemon movl $1, %ecx 86034840Sjlemon fillkpt(R(_vm86pa), $PG_RW|PG_U) 86134840Sjlemon 86234840Sjlemon/* ...likewise for the ISA hole */ 86334840Sjlemon movl $ISA_HOLE_START, %eax 86434840Sjlemon movl $ISA_HOLE_START>>PAGE_SHIFT, %ebx 86534840Sjlemon movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 86634840Sjlemon fillkpt(R(_vm86pa), $PG_RW|PG_U) 86734840Sjlemon 86826812Speter#ifdef SMP 86926812Speter/* Map cpu0's private page into global kmem (4K @ cpu0prvpage) */ 87025164Speter movl R(cpu0pp), %eax 87125164Speter movl $1, %ecx 87225164Speter fillkptphys($PG_RW) 87325164Speter 87446129Sluoqi/* Map SMP page table page into global kmem FWIW */ 87546129Sluoqi movl R(SMPptpa), %eax 87625164Speter movl $1, %ecx 87725164Speter fillkptphys($PG_RW) 87825164Speter 87946129Sluoqi/* Map the private page into the SMP page table */ 88025164Speter movl R(cpu0pp), %eax 88125164Speter movl $0, %ebx /* pte offset = 0 */ 88225164Speter movl $1, %ecx /* one private page coming right up */ 88346129Sluoqi fillkpt(R(SMPptpa), $PG_RW) 88425164Speter 88526812Speter/* ... and put the page table table in the pde. */ 88646129Sluoqi movl R(SMPptpa), %eax 88725164Speter movl $MPPTDI, %ebx 88825164Speter movl $1, %ecx 88925164Speter fillkpt(R(_IdlePTD), $PG_RW) 89034840Sjlemon 89134840Sjlemon/* Fakeup VA for the local apic to allow early traps. */ 89234840Sjlemon ALLOCPAGES(1) 89334840Sjlemon movl %esi, %eax 89446129Sluoqi movl $(NPTEPG-1), %ebx /* pte offset = NTEPG-1 */ 89534840Sjlemon movl $1, %ecx /* one private pt coming right up */ 89646129Sluoqi fillkpt(R(SMPptpa), $PG_RW) 89734840Sjlemon 89834840Sjlemon/* Initialize mp lock to allow early traps */ 89934840Sjlemon movl $1, R(_mp_lock) 90026812Speter#endif /* SMP */ 90125164Speter 90215392Sphk/* install a pde for temporary double map of bottom of VA */ 90315392Sphk movl R(_KPTphys), %eax 90415565Sphk xorl %ebx, %ebx 90515565Sphk movl $1, %ecx 90619621Sdyson fillkpt(R(_IdlePTD), $PG_RW) 9074Srgrimes 90815392Sphk/* install pde's for pt's */ 90915392Sphk movl R(_KPTphys), %eax 91015565Sphk movl $KPTDI, %ebx 91115565Sphk movl $NKPT, %ecx 91219621Sdyson fillkpt(R(_IdlePTD), $PG_RW) 9134Srgrimes 91415392Sphk/* install a pde recursively mapping page directory as a page table */ 91515565Sphk movl R(_IdlePTD), %eax 91615565Sphk movl $PTDPTDI, %ebx 91715565Sphk movl $1,%ecx 91819621Sdyson fillkpt(R(_IdlePTD), $PG_RW) 9194Srgrimes 9204Srgrimes ret 92115428Sphk 92215428Sphk#ifdef BDE_DEBUGGER 92315428Sphkbdb_prepare_paging: 92415428Sphk cmpl $0,R(_bdb_exists) 92515428Sphk je bdb_prepare_paging_exit 92615428Sphk 92715428Sphk subl $6,%esp 92815428Sphk 92915428Sphk /* 93015428Sphk * Copy and convert debugger entries from the bootstrap gdt and idt 93115428Sphk * to the kernel gdt and idt. Everything is still in low memory. 93215428Sphk * Tracing continues to work after paging is enabled because the 93315428Sphk * low memory addresses remain valid until everything is relocated. 93415428Sphk * However, tracing through the setidt() that initializes the trace 93515428Sphk * trap will crash. 93615428Sphk */ 93715428Sphk sgdt (%esp) 93815428Sphk movl 2(%esp),%esi /* base address of bootstrap gdt */ 93915428Sphk movl $R(_gdt),%edi 94015428Sphk movl %edi,2(%esp) /* prepare to load kernel gdt */ 94115428Sphk movl $8*18/4,%ecx 94215428Sphk cld 94315428Sphk rep /* copy gdt */ 94415428Sphk movsl 94515428Sphk movl $R(_gdt),-8+2(%edi) /* adjust gdt self-ptr */ 94615428Sphk movb $0x92,-8+5(%edi) 94715428Sphk lgdt (%esp) 94815428Sphk 94915428Sphk sidt (%esp) 95015428Sphk movl 2(%esp),%esi /* base address of current idt */ 95115428Sphk movl 8+4(%esi),%eax /* convert dbg descriptor to ... */ 95215428Sphk movw 8(%esi),%ax 95315428Sphk movl %eax,R(bdb_dbg_ljmp+1) /* ... immediate offset ... */ 95415428Sphk movl 8+2(%esi),%eax 95515428Sphk movw %ax,R(bdb_dbg_ljmp+5) /* ... and selector for ljmp */ 95615428Sphk movl 24+4(%esi),%eax /* same for bpt descriptor */ 95715428Sphk movw 24(%esi),%ax 95815428Sphk movl %eax,R(bdb_bpt_ljmp+1) 95915428Sphk movl 24+2(%esi),%eax 96015428Sphk movw %ax,R(bdb_bpt_ljmp+5) 96148005Sbde movl R(_idt),%edi 96215428Sphk movl %edi,2(%esp) /* prepare to load kernel idt */ 96315428Sphk movl $8*4/4,%ecx 96415428Sphk cld 96515428Sphk rep /* copy idt */ 96615428Sphk movsl 96715428Sphk lidt (%esp) 96815428Sphk 96915428Sphk addl $6,%esp 97015428Sphk 97115428Sphkbdb_prepare_paging_exit: 97215428Sphk ret 97315428Sphk 97415428Sphk/* Relocate debugger gdt entries and gdt and idt pointers. */ 97515428Sphkbdb_commit_paging: 97615428Sphk cmpl $0,_bdb_exists 97715428Sphk je bdb_commit_paging_exit 97815428Sphk 97915428Sphk movl $_gdt+8*9,%eax /* adjust slots 9-17 */ 98015428Sphk movl $9,%ecx 98115428Sphkreloc_gdt: 98215428Sphk movb $KERNBASE>>24,7(%eax) /* top byte of base addresses, was 0, */ 98315428Sphk addl $8,%eax /* now KERNBASE>>24 */ 98415428Sphk loop reloc_gdt 98515428Sphk 98615428Sphk subl $6,%esp 98715428Sphk sgdt (%esp) 98815428Sphk addl $KERNBASE,2(%esp) 98915428Sphk lgdt (%esp) 99015428Sphk sidt (%esp) 99115428Sphk addl $KERNBASE,2(%esp) 99215428Sphk lidt (%esp) 99315428Sphk addl $6,%esp 99415428Sphk 99515428Sphk int $3 99615428Sphk 99715428Sphkbdb_commit_paging_exit: 99815428Sphk ret 99915428Sphk 100015428Sphk#endif /* BDE_DEBUGGER */ 1001