diff options
author | phk <phk@FreeBSD.org> | 1996-04-26 13:47:39 +0000 |
---|---|---|
committer | phk <phk@FreeBSD.org> | 1996-04-26 13:47:39 +0000 |
commit | 60683a571f9c6f34db1b82a71ee8f5af7ece0906 (patch) | |
tree | ec0de6da0f9a801f917d5629bedc7db5ae23728f /sys/amd64 | |
parent | 24656d4f9902bff5223ed63a2f2db416f4940095 (diff) | |
download | FreeBSD-src-60683a571f9c6f34db1b82a71ee8f5af7ece0906.zip FreeBSD-src-60683a571f9c6f34db1b82a71ee8f5af7ece0906.tar.gz |
A significant debogofication of locore.s. I havn't found any actualy
bugs, but it is a lot easier to navigate this twisted code now.
Diffstat (limited to 'sys/amd64')
-rw-r--r-- | sys/amd64/amd64/locore.S | 646 | ||||
-rw-r--r-- | sys/amd64/amd64/locore.s | 646 | ||||
-rw-r--r-- | sys/amd64/amd64/machdep.c | 3 |
3 files changed, 598 insertions, 697 deletions
diff --git a/sys/amd64/amd64/locore.S b/sys/amd64/amd64/locore.S index 0a72b71..723ea02 100644 --- a/sys/amd64/amd64/locore.S +++ b/sys/amd64/amd64/locore.S @@ -34,15 +34,13 @@ * SUCH DAMAGE. * * from: @(#)locore.s 7.3 (Berkeley) 5/13/91 - * $Id: locore.s,v 1.63 1996/03/02 19:37:38 peter Exp $ - */ - -/* - * locore.s: FreeBSD machine support for the Intel 386 + * $Id: locore.s,v 1.64 1996/03/27 17:16:29 bde Exp $ + * * originally from: locore.s, by William F. Jolitz * * Substantially rewritten by David Greenman, Rod Grimes, - * Bruce Evans, Wolfgang Solfrank, and many others. + * Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp + * and many others. */ #include "apm.h" @@ -112,7 +110,7 @@ tmpstk: .globl _boothowto,_bootdev - .globl _cpu,_cold,_atdevbase,_cpu_vendor,_cpu_id,_bootinfo + .globl _cpu,_atdevbase,_cpu_vendor,_cpu_id,_bootinfo .globl _cpu_high, _cpu_feature _cpu: .long 0 /* are we 386, 386sx, or 486 */ @@ -121,11 +119,12 @@ _cpu_high: .long 0 /* highest arg to CPUID */ _cpu_feature: .long 0 /* features */ _cpu_vendor: .space 20 /* CPU origin code */ _bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */ -_cold: .long 1 /* cold till we are not */ _atdevbase: .long 0 /* location of start of iomem in virtual */ -_atdevphys: .long 0 /* location of device mapping ptes (phys) */ _KERNend: .long 0 /* phys addr end of kernel (just after bss) */ +physfree: .long 0 /* phys addr end of kernel (just after bss) */ +upa: .long 0 /* phys addr end of kernel (just after bss) */ +p0s: .long 0 /* phys addr end of kernel (just after bss) */ .globl _IdlePTD _IdlePTD: .long 0 /* phys addr of kernel PTD */ @@ -135,36 +134,182 @@ _KPTphys: .long 0 /* phys addr of kernel page tables */ .globl _proc0paddr _proc0paddr: .long 0 /* address of proc 0 address space */ -#ifdef BDE_DEBUGGER - .globl _bdb_exists /* flag to indicate BDE debugger is available */ -_bdb_exists: .long 0 -#endif -/* - * System Initialization +/********************************************************************** + * + * Some handy macros + * */ - .text + +#define R(foo) ((foo)-KERNBASE) + +#define ROUND2PAGE(foo) addl $NBPG-1, foo; andl $~(NBPG-1), foo + +#define ALLOCPAGES(foo) \ + movl R(physfree), %esi ; \ + movl $((foo)*NBPG), %eax ; \ + addl %esi, %eax ; \ + movl %eax, R(physfree) ; \ + movl %esi, %edi ; \ + movl $((foo)*NBPG),%ecx ; \ + xorl %eax,%eax ; \ + cld ; rep ; stosb /* - * btext: beginning of text section. - * Also the entry point (jumped to directly from the boot blocks). + * fillkpt + * eax = (page frame address | control | status) == pte + * ebx = address of page table + * ecx = how many pages to map + */ +#define fillkpt \ +1: movl %eax,(%ebx) ; \ + addl $NBPG,%eax ; /* increment physical address */ \ + addl $4,%ebx ; /* next pte */ \ + loop 1b ; + + .text +/********************************************************************** + * + * This is where the bootblocks start us, set the ball rolling... + * */ NON_GPROF_ENTRY(btext) - movw $0x1234,0x472 /* warm boot */ - /* Set up a real frame, some day we will be doing returns */ +/* Tell the bios to warmboot next time */ + movw $0x1234,0x472 + +/* Set up a real frame, some day we may be doing returns */ pushl %ebp movl %esp, %ebp - /* Don't trust what the BIOS gives for eflags. */ +/* Don't trust what the BIOS gives for eflags. */ pushl $PSL_KERNEL popfl - - /* Don't trust what the BIOS gives for %fs and %gs. */ - mov %ds, %ax + mov %ds, %ax /* ... or segment registers */ + mov %ax, %es mov %ax, %fs mov %ax, %gs + call recover_bootinfo + +/* get onto a stack we know the size of */ + movl $R(tmpstk),%esp + mov %ds, %ax + mov %ax, %ss + + call identify_cpu + +/* clear bss */ + movl $R(_end),%ecx + movl $R(_edata),%edi + subl %edi,%ecx + xorl %eax,%eax + cld ; rep ; stosb + +#if NAPM > 0 + call _apm_setup /* ... in i386/apm/apm_setup.s */ +#endif /* NAPM */ + + call create_pagetables + +/* Now enable paging */ + movl R(_IdlePTD), %eax + movl %eax,%cr3 /* load ptd addr into mmu */ + movl %cr0,%eax /* get control word */ + orl $CR0_PE|CR0_PG,%eax /* enable paging */ + movl %eax,%cr0 /* and let's page NOW! */ + + pushl $begin /* jump to high mem */ + ret + +/* now running relocated at KERNBASE where the system is linked to run */ +begin: + /* set up bootstrap stack */ + movl $_kstack+UPAGES*NBPG,%esp /* bootstrap stack end location */ + xorl %eax,%eax /* mark end of frames */ + movl %eax,%ebp + movl _proc0paddr,%eax + movl _IdlePTD, %esi + movl %esi,PCB_CR3(%eax) + + /* + * Prepare "first" - physical address of first available page + * after the kernel+pdir+upages+p0stack+page tables + */ + movl physfree, %esi + pushl %esi /* value of first for init386(first) */ + call _init386 /* wire 386 chip for unix operation */ + popl %esi + + .globl __ucodesel,__udatasel + + pushl $0 /* unused */ + pushl __udatasel /* ss */ + pushl $0 /* esp - filled in by execve() */ + pushl $PSL_USER /* eflags (IOPL 0, int enab) */ + pushl __ucodesel /* cs */ + pushl $0 /* eip - filled in by execve() */ + subl $(12*4),%esp /* space for rest of registers */ + + pushl %esp /* call main with frame pointer */ + call _main /* autoconfiguration, mountroot etc */ + + addl $(13*4),%esp /* back to a frame we can return with */ + + /* + * now we've run main() and determined what cpu-type we are, we can + * enable write protection and alignment checking on i486 cpus and + * above. + */ +#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU) + cmpl $CPUCLASS_386,_cpu_class + je 1f + movl %cr0,%eax /* get control word */ + orl $CR0_WP|CR0_AM,%eax /* enable i486 features */ + movl %eax,%cr0 /* and do it */ +#endif + /* + * on return from main(), we are process 1 + * set up address space and stack so that we can 'return' to user mode + */ +1: + movl __ucodesel,%eax + movl __udatasel,%ecx + + movl %cx,%ds + movl %cx,%es + movl %ax,%fs /* double map cs to fs */ + movl %cx,%gs /* and ds to gs */ + iret /* goto user! */ + +#define LCALL(x,y) .byte 0x9a ; .long y ; .word x + +/* + * Signal trampoline, copied to top of user stack + */ +NON_GPROF_ENTRY(sigcode) + call SIGF_HANDLER(%esp) + lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */ + /* copy at 8(%esp)) */ + pushl %eax + pushl %eax /* junk to fake return address */ + movl $SYS_sigreturn,%eax /* sigreturn() */ + LCALL(0x7,0) /* enter kernel with args on stack */ + hlt /* never gets here */ + .align 2,0x90 /* long word text-align */ +_esigcode: + + .data + .globl _szsigcode +_szsigcode: + .long _esigcode-_sigcode + +/********************************************************************** + * + * Recover the bootinfo passed to us from the boot program + * + */ +recover_bootinfo: /* * This code is called in different ways depending on what loaded * and started the kernel. This is used to detect how we get the @@ -199,7 +344,7 @@ NON_GPROF_ENTRY(btext) * address of 0. */ cmpl $0,4(%ebp) - je 2f /* olddiskboot: */ + je olddiskboot /* * We have some form of return address, so this is either the @@ -208,7 +353,7 @@ NON_GPROF_ENTRY(btext) * we are being booted by the new unifrom boot code. */ cmpl $0,24(%ebp) - je 1f /* newboot: */ + je newboot /* * Seems we have been loaded by the old diskless boot code, we @@ -222,12 +367,13 @@ NON_GPROF_ENTRY(btext) * Lets check the bootinfo version, and if we do not understand * it we return to the loader with a status of 1 to indicate this error */ -1: /* newboot: */ +newboot: movl 28(%ebp),%ebx /* &bootinfo.version */ movl BI_VERSION(%ebx),%eax cmpl $1,%eax /* We only understand version 1 */ je 1f movl $1,%eax /* Return status */ + add $4, %esp /* pop recover_bootinfo's retaddr */ leave ret @@ -298,18 +444,21 @@ got_common_bi_size: * Note that the newer boot code just falls into here to pick * up howto and bootdev, cyloffset and esym are no longer used */ -2: /* olddiskboot: */ +olddiskboot: movl 8(%ebp),%eax movl %eax,_boothowto-KERNBASE movl 12(%ebp),%eax movl %eax,_bootdev-KERNBASE -#if NAPM > 0 - /* call APM BIOS driver setup (i386/apm/apm_setup.s) */ - call _apm_setup -#endif /* NAPM */ + ret + - /* Find out our CPU type. */ +/********************************************************************** + * + * Identify the CPU and initialize anything special about it + * + */ +identify_cpu: /* Try to toggle alignment check flag; does not exist on 386. */ pushfl @@ -391,9 +540,9 @@ got_common_bi_size: andb $~CCR0_NC0,%al #ifndef CYRIX_CACHE_REALLY_WORKS orb $(CCR0_NC1|CCR0_BARB),%al -#else +#else /* !CYRIX_CACHE_REALLY_WORKS */ orb $CCR0_NC1,%al -#endif +#endif /* CYRIX_CACHE_REALLY_WORKS */ movb %al,%ah movb $CCR0,%al outb %al,$0x22 @@ -458,351 +607,152 @@ got_common_bi_size: /* Greater than Pentium...call it a Pentium Pro */ movl $CPU_686,_cpu-KERNBASE 3: + ret - /* - * Finished with old stack; load new %esp now instead of later so - * we can trace this code without having to worry about the trace - * trap clobbering the memory test or the zeroing of the bss+bootstrap - * page tables. - * - * XXX - wdboot clears the bss after testing that this is safe. - * This is too wasteful - memory below 640K is scarce. The boot - * program should check: - * text+data <= &stack_variable - more_space_for_stack - * text+data+bss+pad+space_for_page_tables <= end_of_memory - * Oops, the gdt is in the carcass of the boot program so clearing - * the rest of memory is still not possible. - */ - movl $tmpstk-KERNBASE,%esp /* bootstrap stack end location */ -/* - * Virtual address space of kernel: +/********************************************************************** + * + * Create the first page directory and it's page tables * - * text | data | bss | [syms] | page dir | proc0 kernel stack | usr stk map | Sysmap - * pages: 1 UPAGES (2) 1 NKPT (7) */ -/* find end of kernel image */ - movl $_end-KERNBASE,%ecx - addl $NBPG-1,%ecx /* page align up */ - andl $~(NBPG-1),%ecx - movl %ecx,%esi /* esi = start of free memory */ - movl %ecx,_KERNend-KERNBASE /* save end of kernel */ +create_pagetables: -/* clear bss */ - movl $_edata-KERNBASE,%edi - subl %edi,%ecx /* get amount to clear */ - xorl %eax,%eax /* specify zero fill */ - cld - rep - stosb +/* find end of kernel image */ + movl $R(_end),%esi +/* include symbols in "kernel image" if they are loaded and useful */ #ifdef DDB -/* include symbols in "kernel image" if they are loaded */ - movl _bootinfo+BI_ESYMTAB-KERNBASE,%edi + movl R(_bootinfo+BI_ESYMTAB),%edi testl %edi,%edi - je over_symalloc - addl $NBPG-1,%edi - andl $~(NBPG-1),%edi + je 1f movl %edi,%esi - movl %esi,_KERNend-KERNBASE movl $KERNBASE,%edi - addl %edi,_bootinfo+BI_SYMTAB-KERNBASE - addl %edi,_bootinfo+BI_ESYMTAB-KERNBASE -over_symalloc: + addl %edi,R(_bootinfo+BI_SYMTAB) + addl %edi,R(_bootinfo+BI_ESYMTAB) +1: #endif -/* - * The value in esi is both the end of the kernel bss and a pointer to - * the kernel page directory, and is used by the rest of locore to build - * the tables. - * esi + 1(page dir) + 2(UPAGES) + 1(p0stack) + NKPT(number of kernel - * page table pages) is then passed on the stack to init386(first) as - * the value first. esi should ALWAYS be page aligned!! - */ - movl %esi,%ecx /* Get current first availiable address */ + ROUND2PAGE(%esi) + movl %esi,R(_KERNend) /* save end of kernel */ + movl %esi,R(physfree) /* save end of kernel */ -/* clear pagetables, page directory, stack, etc... */ - movl %esi,%edi /* base (page directory) */ - movl $((1+UPAGES+1+NKPT)*NBPG),%ecx /* amount to clear */ - xorl %eax,%eax /* specify zero fill */ - cld - rep - stosb +/* Allocate Kernel Page Tables */ + ALLOCPAGES(NKPT) + movl %esi,R(_KPTphys) -/* physical address of Idle proc/kernel page directory */ - movl %esi,_IdlePTD-KERNBASE +/* Allocate Page Table Directory */ + ALLOCPAGES(1) + movl %esi,R(_IdlePTD) -/* - * fillkpt - * eax = (page frame address | control | status) == pte - * ebx = address of page table - * ecx = how many pages to map - */ -#define fillkpt \ -1: movl %eax,(%ebx) ; \ - addl $NBPG,%eax ; /* increment physical address */ \ - addl $4,%ebx ; /* next pte */ \ - loop 1b ; +/* Allocate UPAGES */ + ALLOCPAGES(UPAGES) + movl %esi,R(upa); + addl $KERNBASE, %esi + movl %esi, R(_proc0paddr) -/* - * Map Kernel - * - * First step - build page tables - */ -#if defined (KGDB) || defined (BDE_DEBUGGER) - movl _KERNend-KERNBASE,%ecx /* this much memory, */ - shrl $PGSHIFT,%ecx /* for this many PTEs */ -#ifdef BDE_DEBUGGER - cmpl $0xa0,%ecx /* XXX - cover debugger pages */ - jae 1f - movl $0xa0,%ecx -1: -#endif /* BDE_DEBUGGER */ - movl $PG_V|PG_KW,%eax /* kernel R/W, valid */ - lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */ - movl %ebx,_KPTphys-KERNBASE /* save in global */ - fillkpt +/* Allocate P0 Stack */ + ALLOCPAGES(1) + movl %esi,R(p0s); -#else /* !KGDB && !BDE_DEBUGGER */ - /* write protect kernel text (doesn't do a thing for 386's - only 486's) */ - movl $_etext-KERNBASE,%ecx /* get size of text */ - addl $NBPG-1,%ecx /* round up to page */ - shrl $PGSHIFT,%ecx /* for this many PTEs */ - movl $PG_V|PG_KR,%eax /* specify read only */ -#if 0 - movl $_etext,%ecx /* get size of text */ - subl $_btext,%ecx - addl $NBPG-1,%ecx /* round up to page */ - shrl $PGSHIFT,%ecx /* for this many PTEs */ - movl $_btext-KERNBASE,%eax /* get offset to physical memory */ - orl $PG_V|PG_KR,%eax /* specify read only */ -#endif - lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */ - movl %ebx,_KPTphys-KERNBASE /* save in global */ +/* Map read-only from zero to the end of the kernel text section */ + movl R(_KPTphys), %esi + movl $R(_etext),%ecx + addl $NBPG-1,%ecx + shrl $PGSHIFT,%ecx + movl $PG_V|PG_KR,%eax + movl %esi, %ebx fillkpt - /* data and bss are r/w */ - andl $PG_FRAME,%eax /* strip to just addr of bss */ - movl _KERNend-KERNBASE,%ecx /* calculate size */ +/* Map read-write, data, bss and symbols */ + andl $PG_FRAME,%eax + movl R(_KERNend),%ecx subl %eax,%ecx shrl $PGSHIFT,%ecx - orl $PG_V|PG_KW,%eax /* valid, kernel read/write */ - fillkpt -#endif /* KGDB || BDE_DEBUGGER */ - -/* now initialize the page dir, upages, and p0stack PT */ - - movl $(1+UPAGES+1),%ecx /* number of PTEs */ - movl %esi,%eax /* phys address of PTD */ - andl $PG_FRAME,%eax /* convert to PFN, should be a NOP */ - orl $PG_V|PG_KW,%eax /* valid, kernel read/write */ - movl %esi,%ebx /* calculate pte offset to ptd */ - shrl $PGSHIFT-2,%ebx - addl %esi,%ebx /* address of page directory */ - addl $((1+UPAGES+1)*NBPG),%ebx /* offset to kernel page tables */ + orl $PG_V|PG_KW,%eax fillkpt -/* map I/O memory map */ - - movl _KPTphys-KERNBASE,%ebx /* base of kernel page tables */ - lea (0xa0 * PTESIZE)(%ebx),%ebx /* hardwire ISA hole at KERNBASE + 0xa0000 */ - movl $0x100-0xa0,%ecx /* for this many pte s, */ - movl $(0xa0000|PG_V|PG_KW|PG_N),%eax /* valid, kernel read/write, non-cacheable */ - movl %ebx,_atdevphys-KERNBASE /* save phys addr of ptes */ +/* Map PD */ + movl R(_IdlePTD), %eax + movl $1, %ecx + movl %eax, %ebx + shrl $PGSHIFT-2, %ebx + addl R(_KPTphys), %ebx + orl $PG_V|PG_KW, %eax fillkpt - /* map proc 0's kernel stack into user page table page */ - - movl $UPAGES,%ecx /* for this many pte s, */ - lea (1*NBPG)(%esi),%eax /* physical address in proc 0 */ - lea (KERNBASE)(%eax),%edx /* change into virtual addr */ - movl %edx,_proc0paddr-KERNBASE /* save VA for proc 0 init */ - orl $PG_V|PG_KW,%eax /* valid, kernel read/write */ - lea ((1+UPAGES)*NBPG)(%esi),%ebx /* addr of stack page table in proc 0 */ - addl $(KSTKPTEOFF * PTESIZE),%ebx /* offset to kernel stack PTE */ +/* Map Proc 0 kernel stack */ + movl R(p0s), %eax + movl $1, %ecx + movl %eax, %ebx + shrl $PGSHIFT-2, %ebx + addl R(_KPTphys), %ebx + orl $PG_V|PG_KW, %eax fillkpt -/* - * Initialize kernel page table directory - */ - /* install a pde for temporary double map of bottom of VA */ - movl _KPTphys-KERNBASE,%eax - orl $PG_V|PG_KW,%eax /* valid, kernel read/write */ - movl %eax,(%esi) /* which is where temp maps! */ - - /* initialize kernel pde's */ - movl $(NKPT),%ecx /* for this many PDEs */ - lea (KPTDI*PDESIZE)(%esi),%ebx /* offset of pde for kernel */ +/* ... also in user page table page */ + movl R(p0s), %eax + movl $1, %ecx + orl $PG_V|PG_KW, %eax + movl R(_KPTphys), %ebx + addl $(KSTKPTEOFF * PTESIZE), %ebx fillkpt - /* install a pde recursively mapping page directory as a page table! */ - movl %esi,%eax /* phys address of ptd in proc 0 */ - orl $PG_V|PG_KW,%eax /* pde entry is valid */ - movl %eax,PTDPTDI*PDESIZE(%esi) /* which is where PTmap maps! */ - - /* install a pde to map kernel stack for proc 0 */ - lea ((1+UPAGES)*NBPG)(%esi),%eax /* physical address of pt in proc 0 */ - orl $PG_V|PG_KW,%eax /* pde entry is valid */ - movl %eax,KSTKPTDI*PDESIZE(%esi) /* which is where kernel stack maps! */ - -#ifdef BDE_DEBUGGER - /* copy and convert stuff from old gdt and idt for debugger */ - - cmpl $0x0375c339,0x96104 /* XXX - debugger signature */ - jne 1f - movb $1,_bdb_exists-KERNBASE -1: - pushal - subl $2*6,%esp - - sgdt (%esp) - movl 2(%esp),%esi /* base address of current gdt */ - movl $_gdt-KERNBASE,%edi - movl %edi,2(%esp) - movl $8*18/4,%ecx - cld - rep /* copy gdt */ - movsl - movl $_gdt-KERNBASE,-8+2(%edi) /* adjust gdt self-ptr */ - movb $0x92,-8+5(%edi) - - sidt 6(%esp) - movl 6+2(%esp),%esi /* base address of current idt */ - movl 8+4(%esi),%eax /* convert dbg descriptor to ... */ - movw 8(%esi),%ax - movl %eax,bdb_dbg_ljmp+1-KERNBASE /* ... immediate offset ... */ - movl 8+2(%esi),%eax - movw %ax,bdb_dbg_ljmp+5-KERNBASE /* ... and selector for ljmp */ - movl 24+4(%esi),%eax /* same for bpt descriptor */ - movw 24(%esi),%ax - movl %eax,bdb_bpt_ljmp+1-KERNBASE - movl 24+2(%esi),%eax - movw %ax,bdb_bpt_ljmp+5-KERNBASE - - movl $_idt-KERNBASE,%edi - movl %edi,6+2(%esp) - movl $8*4/4,%ecx - cld - rep /* copy idt */ - movsl +/* Map UPAGES */ + movl R(upa), %eax + movl $UPAGES, %ecx + movl %eax, %ebx + shrl $PGSHIFT-2, %ebx + addl R(_KPTphys), %ebx + orl $PG_V|PG_KW, %eax + fillkpt - lgdt (%esp) - lidt 6(%esp) +/* ... also in user page table page */ + movl R(upa), %eax + movl $UPAGES, %ecx + orl $PG_V|PG_KW, %eax + movl R(p0s), %ebx + addl $(KSTKPTEOFF * PTESIZE), %ebx + fillkpt - addl $2*6,%esp - popal -#endif /* BDE_DEBUGGER */ +/* and a pde entry too */ + movl R(p0s), %eax + movl R(_IdlePTD), %esi + orl $PG_V|PG_KW,%eax + movl %eax,KSTKPTDI*PDESIZE(%esi) + +/* Map ISA hole */ +#define ISA_HOLE_START 0xa0000 +#define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START) + movl $ISA_HOLE_LENGTH>>PGSHIFT, %ecx + movl ISA_HOLE_START, %eax + movl %eax, %ebx + shrl $PGSHIFT-2, %ebx + addl R(_KPTphys), %ebx + orl $PG_V|PG_KW|PG_N, %eax + fillkpt + movl ISA_HOLE_START, %eax + addl $KERNBASE, %eax + movl %eax, R(_atdevbase) + +/* install a pde for temporary double map of bottom of VA */ + movl R(_IdlePTD), %esi + movl R(_KPTphys), %eax + orl $PG_V|PG_KW, %eax + movl %eax, (%esi) + +/* install pde's for pt's */ + movl R(_IdlePTD), %esi + movl R(_KPTphys), %eax + orl $PG_V|PG_KW, %eax + movl $(NKPT), %ecx + lea (KPTDI*PDESIZE)(%esi), %ebx + fillkpt - /* load base of page directory and enable mapping */ - movl %esi,%eax /* phys address of ptd in proc 0 */ - movl %eax,%cr3 /* load ptd addr into mmu */ - movl %cr0,%eax /* get control word */ - orl $CR0_PE|CR0_PG,%eax /* enable paging */ - movl %eax,%cr0 /* and let's page NOW! */ +/* install a pde recursively mapping page directory as a page table */ + movl R(_IdlePTD), %esi + movl %esi,%eax + orl $PG_V|PG_KW,%eax + movl %eax,PTDPTDI*PDESIZE(%esi) - pushl $begin /* jump to high mem */ ret - -begin: /* now running relocated at KERNBASE where the system is linked to run */ - movl _atdevphys,%edx /* get pte PA */ - subl _KPTphys,%edx /* remove base of ptes, now have phys offset */ - shll $PGSHIFT-2,%edx /* corresponding to virt offset */ - addl $KERNBASE,%edx /* add virtual base */ - movl %edx,_atdevbase - - /* set up bootstrap stack */ - movl $_kstack+UPAGES*NBPG,%esp /* bootstrap stack end location */ - xorl %eax,%eax /* mark end of frames */ - movl %eax,%ebp - movl _proc0paddr,%eax - movl %esi,PCB_CR3(%eax) - -#ifdef BDE_DEBUGGER - /* relocate debugger gdt entries */ - - movl $_gdt+8*9,%eax /* adjust slots 9-17 */ - movl $9,%ecx -reloc_gdt: - movb $KERNBASE>>24,7(%eax) /* top byte of base addresses, was 0, */ - addl $8,%eax /* now KERNBASE>>24 */ - loop reloc_gdt - - cmpl $0,_bdb_exists - je 1f - int $3 -1: -#endif /* BDE_DEBUGGER */ - - /* - * Prepare "first" - physical address of first available page - * after the kernel+pdir+upages+p0stack+page tables - */ - lea ((1+UPAGES+1+NKPT)*NBPG)(%esi),%esi - - pushl %esi /* value of first for init386(first) */ - call _init386 /* wire 386 chip for unix operation */ - popl %esi - - .globl __ucodesel,__udatasel - - pushl $0 /* unused */ - pushl __udatasel /* ss */ - pushl $0 /* esp - filled in by execve() */ - pushl $PSL_USER /* eflags (IOPL 0, int enab) */ - pushl __ucodesel /* cs */ - pushl $0 /* eip - filled in by execve() */ - subl $(12*4),%esp /* space for rest of registers */ - - pushl %esp /* call main with frame pointer */ - call _main /* autoconfiguration, mountroot etc */ - - addl $(13*4),%esp /* back to a frame we can return with */ - - /* - * now we've run main() and determined what cpu-type we are, we can - * enable write protection and alignment checking on i486 cpus and - * above. - */ -#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU) - cmpl $CPUCLASS_386,_cpu_class - je 1f - movl %cr0,%eax /* get control word */ - orl $CR0_WP|CR0_AM,%eax /* enable i486 features */ - movl %eax,%cr0 /* and do it */ -#endif - /* - * on return from main(), we are process 1 - * set up address space and stack so that we can 'return' to user mode - */ -1: - movl __ucodesel,%eax - movl __udatasel,%ecx - - movl %cx,%ds - movl %cx,%es - movl %ax,%fs /* double map cs to fs */ - movl %cx,%gs /* and ds to gs */ - iret /* goto user! */ - -#define LCALL(x,y) .byte 0x9a ; .long y ; .word x - -/* - * Signal trampoline, copied to top of user stack - */ -NON_GPROF_ENTRY(sigcode) - call SIGF_HANDLER(%esp) - lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */ - /* copy at 8(%esp)) */ - pushl %eax - pushl %eax /* junk to fake return address */ - movl $SYS_sigreturn,%eax /* sigreturn() */ - LCALL(0x7,0) /* enter kernel with args on stack */ - hlt /* never gets here */ - .align 2,0x90 /* long word text-align */ -_esigcode: - - .data - .globl _szsigcode -_szsigcode: - .long _esigcode-_sigcode diff --git a/sys/amd64/amd64/locore.s b/sys/amd64/amd64/locore.s index 0a72b71..723ea02 100644 --- a/sys/amd64/amd64/locore.s +++ b/sys/amd64/amd64/locore.s @@ -34,15 +34,13 @@ * SUCH DAMAGE. * * from: @(#)locore.s 7.3 (Berkeley) 5/13/91 - * $Id: locore.s,v 1.63 1996/03/02 19:37:38 peter Exp $ - */ - -/* - * locore.s: FreeBSD machine support for the Intel 386 + * $Id: locore.s,v 1.64 1996/03/27 17:16:29 bde Exp $ + * * originally from: locore.s, by William F. Jolitz * * Substantially rewritten by David Greenman, Rod Grimes, - * Bruce Evans, Wolfgang Solfrank, and many others. + * Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp + * and many others. */ #include "apm.h" @@ -112,7 +110,7 @@ tmpstk: .globl _boothowto,_bootdev - .globl _cpu,_cold,_atdevbase,_cpu_vendor,_cpu_id,_bootinfo + .globl _cpu,_atdevbase,_cpu_vendor,_cpu_id,_bootinfo .globl _cpu_high, _cpu_feature _cpu: .long 0 /* are we 386, 386sx, or 486 */ @@ -121,11 +119,12 @@ _cpu_high: .long 0 /* highest arg to CPUID */ _cpu_feature: .long 0 /* features */ _cpu_vendor: .space 20 /* CPU origin code */ _bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */ -_cold: .long 1 /* cold till we are not */ _atdevbase: .long 0 /* location of start of iomem in virtual */ -_atdevphys: .long 0 /* location of device mapping ptes (phys) */ _KERNend: .long 0 /* phys addr end of kernel (just after bss) */ +physfree: .long 0 /* phys addr end of kernel (just after bss) */ +upa: .long 0 /* phys addr end of kernel (just after bss) */ +p0s: .long 0 /* phys addr end of kernel (just after bss) */ .globl _IdlePTD _IdlePTD: .long 0 /* phys addr of kernel PTD */ @@ -135,36 +134,182 @@ _KPTphys: .long 0 /* phys addr of kernel page tables */ .globl _proc0paddr _proc0paddr: .long 0 /* address of proc 0 address space */ -#ifdef BDE_DEBUGGER - .globl _bdb_exists /* flag to indicate BDE debugger is available */ -_bdb_exists: .long 0 -#endif -/* - * System Initialization +/********************************************************************** + * + * Some handy macros + * */ - .text + +#define R(foo) ((foo)-KERNBASE) + +#define ROUND2PAGE(foo) addl $NBPG-1, foo; andl $~(NBPG-1), foo + +#define ALLOCPAGES(foo) \ + movl R(physfree), %esi ; \ + movl $((foo)*NBPG), %eax ; \ + addl %esi, %eax ; \ + movl %eax, R(physfree) ; \ + movl %esi, %edi ; \ + movl $((foo)*NBPG),%ecx ; \ + xorl %eax,%eax ; \ + cld ; rep ; stosb /* - * btext: beginning of text section. - * Also the entry point (jumped to directly from the boot blocks). + * fillkpt + * eax = (page frame address | control | status) == pte + * ebx = address of page table + * ecx = how many pages to map + */ +#define fillkpt \ +1: movl %eax,(%ebx) ; \ + addl $NBPG,%eax ; /* increment physical address */ \ + addl $4,%ebx ; /* next pte */ \ + loop 1b ; + + .text +/********************************************************************** + * + * This is where the bootblocks start us, set the ball rolling... + * */ NON_GPROF_ENTRY(btext) - movw $0x1234,0x472 /* warm boot */ - /* Set up a real frame, some day we will be doing returns */ +/* Tell the bios to warmboot next time */ + movw $0x1234,0x472 + +/* Set up a real frame, some day we may be doing returns */ pushl %ebp movl %esp, %ebp - /* Don't trust what the BIOS gives for eflags. */ +/* Don't trust what the BIOS gives for eflags. */ pushl $PSL_KERNEL popfl - - /* Don't trust what the BIOS gives for %fs and %gs. */ - mov %ds, %ax + mov %ds, %ax /* ... or segment registers */ + mov %ax, %es mov %ax, %fs mov %ax, %gs + call recover_bootinfo + +/* get onto a stack we know the size of */ + movl $R(tmpstk),%esp + mov %ds, %ax + mov %ax, %ss + + call identify_cpu + +/* clear bss */ + movl $R(_end),%ecx + movl $R(_edata),%edi + subl %edi,%ecx + xorl %eax,%eax + cld ; rep ; stosb + +#if NAPM > 0 + call _apm_setup /* ... in i386/apm/apm_setup.s */ +#endif /* NAPM */ + + call create_pagetables + +/* Now enable paging */ + movl R(_IdlePTD), %eax + movl %eax,%cr3 /* load ptd addr into mmu */ + movl %cr0,%eax /* get control word */ + orl $CR0_PE|CR0_PG,%eax /* enable paging */ + movl %eax,%cr0 /* and let's page NOW! */ + + pushl $begin /* jump to high mem */ + ret + +/* now running relocated at KERNBASE where the system is linked to run */ +begin: + /* set up bootstrap stack */ + movl $_kstack+UPAGES*NBPG,%esp /* bootstrap stack end location */ + xorl %eax,%eax /* mark end of frames */ + movl %eax,%ebp + movl _proc0paddr,%eax + movl _IdlePTD, %esi + movl %esi,PCB_CR3(%eax) + + /* + * Prepare "first" - physical address of first available page + * after the kernel+pdir+upages+p0stack+page tables + */ + movl physfree, %esi + pushl %esi /* value of first for init386(first) */ + call _init386 /* wire 386 chip for unix operation */ + popl %esi + + .globl __ucodesel,__udatasel + + pushl $0 /* unused */ + pushl __udatasel /* ss */ + pushl $0 /* esp - filled in by execve() */ + pushl $PSL_USER /* eflags (IOPL 0, int enab) */ + pushl __ucodesel /* cs */ + pushl $0 /* eip - filled in by execve() */ + subl $(12*4),%esp /* space for rest of registers */ + + pushl %esp /* call main with frame pointer */ + call _main /* autoconfiguration, mountroot etc */ + + addl $(13*4),%esp /* back to a frame we can return with */ + + /* + * now we've run main() and determined what cpu-type we are, we can + * enable write protection and alignment checking on i486 cpus and + * above. + */ +#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU) + cmpl $CPUCLASS_386,_cpu_class + je 1f + movl %cr0,%eax /* get control word */ + orl $CR0_WP|CR0_AM,%eax /* enable i486 features */ + movl %eax,%cr0 /* and do it */ +#endif + /* + * on return from main(), we are process 1 + * set up address space and stack so that we can 'return' to user mode + */ +1: + movl __ucodesel,%eax + movl __udatasel,%ecx + + movl %cx,%ds + movl %cx,%es + movl %ax,%fs /* double map cs to fs */ + movl %cx,%gs /* and ds to gs */ + iret /* goto user! */ + +#define LCALL(x,y) .byte 0x9a ; .long y ; .word x + +/* + * Signal trampoline, copied to top of user stack + */ +NON_GPROF_ENTRY(sigcode) + call SIGF_HANDLER(%esp) + lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */ + /* copy at 8(%esp)) */ + pushl %eax + pushl %eax /* junk to fake return address */ + movl $SYS_sigreturn,%eax /* sigreturn() */ + LCALL(0x7,0) /* enter kernel with args on stack */ + hlt /* never gets here */ + .align 2,0x90 /* long word text-align */ +_esigcode: + + .data + .globl _szsigcode +_szsigcode: + .long _esigcode-_sigcode + +/********************************************************************** + * + * Recover the bootinfo passed to us from the boot program + * + */ +recover_bootinfo: /* * This code is called in different ways depending on what loaded * and started the kernel. This is used to detect how we get the @@ -199,7 +344,7 @@ NON_GPROF_ENTRY(btext) * address of 0. */ cmpl $0,4(%ebp) - je 2f /* olddiskboot: */ + je olddiskboot /* * We have some form of return address, so this is either the @@ -208,7 +353,7 @@ NON_GPROF_ENTRY(btext) * we are being booted by the new unifrom boot code. */ cmpl $0,24(%ebp) - je 1f /* newboot: */ + je newboot /* * Seems we have been loaded by the old diskless boot code, we @@ -222,12 +367,13 @@ NON_GPROF_ENTRY(btext) * Lets check the bootinfo version, and if we do not understand * it we return to the loader with a status of 1 to indicate this error */ -1: /* newboot: */ +newboot: movl 28(%ebp),%ebx /* &bootinfo.version */ movl BI_VERSION(%ebx),%eax cmpl $1,%eax /* We only understand version 1 */ je 1f movl $1,%eax /* Return status */ + add $4, %esp /* pop recover_bootinfo's retaddr */ leave ret @@ -298,18 +444,21 @@ got_common_bi_size: * Note that the newer boot code just falls into here to pick * up howto and bootdev, cyloffset and esym are no longer used */ -2: /* olddiskboot: */ +olddiskboot: movl 8(%ebp),%eax movl %eax,_boothowto-KERNBASE movl 12(%ebp),%eax movl %eax,_bootdev-KERNBASE -#if NAPM > 0 - /* call APM BIOS driver setup (i386/apm/apm_setup.s) */ - call _apm_setup -#endif /* NAPM */ + ret + - /* Find out our CPU type. */ +/********************************************************************** + * + * Identify the CPU and initialize anything special about it + * + */ +identify_cpu: /* Try to toggle alignment check flag; does not exist on 386. */ pushfl @@ -391,9 +540,9 @@ got_common_bi_size: andb $~CCR0_NC0,%al #ifndef CYRIX_CACHE_REALLY_WORKS orb $(CCR0_NC1|CCR0_BARB),%al -#else +#else /* !CYRIX_CACHE_REALLY_WORKS */ orb $CCR0_NC1,%al -#endif +#endif /* CYRIX_CACHE_REALLY_WORKS */ movb %al,%ah movb $CCR0,%al outb %al,$0x22 @@ -458,351 +607,152 @@ got_common_bi_size: /* Greater than Pentium...call it a Pentium Pro */ movl $CPU_686,_cpu-KERNBASE 3: + ret - /* - * Finished with old stack; load new %esp now instead of later so - * we can trace this code without having to worry about the trace - * trap clobbering the memory test or the zeroing of the bss+bootstrap - * page tables. - * - * XXX - wdboot clears the bss after testing that this is safe. - * This is too wasteful - memory below 640K is scarce. The boot - * program should check: - * text+data <= &stack_variable - more_space_for_stack - * text+data+bss+pad+space_for_page_tables <= end_of_memory - * Oops, the gdt is in the carcass of the boot program so clearing - * the rest of memory is still not possible. - */ - movl $tmpstk-KERNBASE,%esp /* bootstrap stack end location */ -/* - * Virtual address space of kernel: +/********************************************************************** + * + * Create the first page directory and it's page tables * - * text | data | bss | [syms] | page dir | proc0 kernel stack | usr stk map | Sysmap - * pages: 1 UPAGES (2) 1 NKPT (7) */ -/* find end of kernel image */ - movl $_end-KERNBASE,%ecx - addl $NBPG-1,%ecx /* page align up */ - andl $~(NBPG-1),%ecx - movl %ecx,%esi /* esi = start of free memory */ - movl %ecx,_KERNend-KERNBASE /* save end of kernel */ +create_pagetables: -/* clear bss */ - movl $_edata-KERNBASE,%edi - subl %edi,%ecx /* get amount to clear */ - xorl %eax,%eax /* specify zero fill */ - cld - rep - stosb +/* find end of kernel image */ + movl $R(_end),%esi +/* include symbols in "kernel image" if they are loaded and useful */ #ifdef DDB -/* include symbols in "kernel image" if they are loaded */ - movl _bootinfo+BI_ESYMTAB-KERNBASE,%edi + movl R(_bootinfo+BI_ESYMTAB),%edi testl %edi,%edi - je over_symalloc - addl $NBPG-1,%edi - andl $~(NBPG-1),%edi + je 1f movl %edi,%esi - movl %esi,_KERNend-KERNBASE movl $KERNBASE,%edi - addl %edi,_bootinfo+BI_SYMTAB-KERNBASE - addl %edi,_bootinfo+BI_ESYMTAB-KERNBASE -over_symalloc: + addl %edi,R(_bootinfo+BI_SYMTAB) + addl %edi,R(_bootinfo+BI_ESYMTAB) +1: #endif -/* - * The value in esi is both the end of the kernel bss and a pointer to - * the kernel page directory, and is used by the rest of locore to build - * the tables. - * esi + 1(page dir) + 2(UPAGES) + 1(p0stack) + NKPT(number of kernel - * page table pages) is then passed on the stack to init386(first) as - * the value first. esi should ALWAYS be page aligned!! - */ - movl %esi,%ecx /* Get current first availiable address */ + ROUND2PAGE(%esi) + movl %esi,R(_KERNend) /* save end of kernel */ + movl %esi,R(physfree) /* save end of kernel */ -/* clear pagetables, page directory, stack, etc... */ - movl %esi,%edi /* base (page directory) */ - movl $((1+UPAGES+1+NKPT)*NBPG),%ecx /* amount to clear */ - xorl %eax,%eax /* specify zero fill */ - cld - rep - stosb +/* Allocate Kernel Page Tables */ + ALLOCPAGES(NKPT) + movl %esi,R(_KPTphys) -/* physical address of Idle proc/kernel page directory */ - movl %esi,_IdlePTD-KERNBASE +/* Allocate Page Table Directory */ + ALLOCPAGES(1) + movl %esi,R(_IdlePTD) -/* - * fillkpt - * eax = (page frame address | control | status) == pte - * ebx = address of page table - * ecx = how many pages to map - */ -#define fillkpt \ -1: movl %eax,(%ebx) ; \ - addl $NBPG,%eax ; /* increment physical address */ \ - addl $4,%ebx ; /* next pte */ \ - loop 1b ; +/* Allocate UPAGES */ + ALLOCPAGES(UPAGES) + movl %esi,R(upa); + addl $KERNBASE, %esi + movl %esi, R(_proc0paddr) -/* - * Map Kernel - * - * First step - build page tables - */ -#if defined (KGDB) || defined (BDE_DEBUGGER) - movl _KERNend-KERNBASE,%ecx /* this much memory, */ - shrl $PGSHIFT,%ecx /* for this many PTEs */ -#ifdef BDE_DEBUGGER - cmpl $0xa0,%ecx /* XXX - cover debugger pages */ - jae 1f - movl $0xa0,%ecx -1: -#endif /* BDE_DEBUGGER */ - movl $PG_V|PG_KW,%eax /* kernel R/W, valid */ - lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */ - movl %ebx,_KPTphys-KERNBASE /* save in global */ - fillkpt +/* Allocate P0 Stack */ + ALLOCPAGES(1) + movl %esi,R(p0s); -#else /* !KGDB && !BDE_DEBUGGER */ - /* write protect kernel text (doesn't do a thing for 386's - only 486's) */ - movl $_etext-KERNBASE,%ecx /* get size of text */ - addl $NBPG-1,%ecx /* round up to page */ - shrl $PGSHIFT,%ecx /* for this many PTEs */ - movl $PG_V|PG_KR,%eax /* specify read only */ -#if 0 - movl $_etext,%ecx /* get size of text */ - subl $_btext,%ecx - addl $NBPG-1,%ecx /* round up to page */ - shrl $PGSHIFT,%ecx /* for this many PTEs */ - movl $_btext-KERNBASE,%eax /* get offset to physical memory */ - orl $PG_V|PG_KR,%eax /* specify read only */ -#endif - lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */ - movl %ebx,_KPTphys-KERNBASE /* save in global */ +/* Map read-only from zero to the end of the kernel text section */ + movl R(_KPTphys), %esi + movl $R(_etext),%ecx + addl $NBPG-1,%ecx + shrl $PGSHIFT,%ecx + movl $PG_V|PG_KR,%eax + movl %esi, %ebx fillkpt - /* data and bss are r/w */ - andl $PG_FRAME,%eax /* strip to just addr of bss */ - movl _KERNend-KERNBASE,%ecx /* calculate size */ +/* Map read-write, data, bss and symbols */ + andl $PG_FRAME,%eax + movl R(_KERNend),%ecx subl %eax,%ecx shrl $PGSHIFT,%ecx - orl $PG_V|PG_KW,%eax /* valid, kernel read/write */ - fillkpt -#endif /* KGDB || BDE_DEBUGGER */ - -/* now initialize the page dir, upages, and p0stack PT */ - - movl $(1+UPAGES+1),%ecx /* number of PTEs */ - movl %esi,%eax /* phys address of PTD */ - andl $PG_FRAME,%eax /* convert to PFN, should be a NOP */ - orl $PG_V|PG_KW,%eax /* valid, kernel read/write */ - movl %esi,%ebx /* calculate pte offset to ptd */ - shrl $PGSHIFT-2,%ebx - addl %esi,%ebx /* address of page directory */ - addl $((1+UPAGES+1)*NBPG),%ebx /* offset to kernel page tables */ + orl $PG_V|PG_KW,%eax fillkpt -/* map I/O memory map */ - - movl _KPTphys-KERNBASE,%ebx /* base of kernel page tables */ - lea (0xa0 * PTESIZE)(%ebx),%ebx /* hardwire ISA hole at KERNBASE + 0xa0000 */ - movl $0x100-0xa0,%ecx /* for this many pte s, */ - movl $(0xa0000|PG_V|PG_KW|PG_N),%eax /* valid, kernel read/write, non-cacheable */ - movl %ebx,_atdevphys-KERNBASE /* save phys addr of ptes */ +/* Map PD */ + movl R(_IdlePTD), %eax + movl $1, %ecx + movl %eax, %ebx + shrl $PGSHIFT-2, %ebx + addl R(_KPTphys), %ebx + orl $PG_V|PG_KW, %eax fillkpt - /* map proc 0's kernel stack into user page table page */ - - movl $UPAGES,%ecx /* for this many pte s, */ - lea (1*NBPG)(%esi),%eax /* physical address in proc 0 */ - lea (KERNBASE)(%eax),%edx /* change into virtual addr */ - movl %edx,_proc0paddr-KERNBASE /* save VA for proc 0 init */ - orl $PG_V|PG_KW,%eax /* valid, kernel read/write */ - lea ((1+UPAGES)*NBPG)(%esi),%ebx /* addr of stack page table in proc 0 */ - addl $(KSTKPTEOFF * PTESIZE),%ebx /* offset to kernel stack PTE */ +/* Map Proc 0 kernel stack */ + movl R(p0s), %eax + movl $1, %ecx + movl %eax, %ebx + shrl $PGSHIFT-2, %ebx + addl R(_KPTphys), %ebx + orl $PG_V|PG_KW, %eax fillkpt -/* - * Initialize kernel page table directory - */ - /* install a pde for temporary double map of bottom of VA */ - movl _KPTphys-KERNBASE,%eax - orl $PG_V|PG_KW,%eax /* valid, kernel read/write */ - movl %eax,(%esi) /* which is where temp maps! */ - - /* initialize kernel pde's */ - movl $(NKPT),%ecx /* for this many PDEs */ - lea (KPTDI*PDESIZE)(%esi),%ebx /* offset of pde for kernel */ +/* ... also in user page table page */ + movl R(p0s), %eax + movl $1, %ecx + orl $PG_V|PG_KW, %eax + movl R(_KPTphys), %ebx + addl $(KSTKPTEOFF * PTESIZE), %ebx fillkpt - /* install a pde recursively mapping page directory as a page table! */ - movl %esi,%eax /* phys address of ptd in proc 0 */ - orl $PG_V|PG_KW,%eax /* pde entry is valid */ - movl %eax,PTDPTDI*PDESIZE(%esi) /* which is where PTmap maps! */ - - /* install a pde to map kernel stack for proc 0 */ - lea ((1+UPAGES)*NBPG)(%esi),%eax /* physical address of pt in proc 0 */ - orl $PG_V|PG_KW,%eax /* pde entry is valid */ - movl %eax,KSTKPTDI*PDESIZE(%esi) /* which is where kernel stack maps! */ - -#ifdef BDE_DEBUGGER - /* copy and convert stuff from old gdt and idt for debugger */ - - cmpl $0x0375c339,0x96104 /* XXX - debugger signature */ - jne 1f - movb $1,_bdb_exists-KERNBASE -1: - pushal - subl $2*6,%esp - - sgdt (%esp) - movl 2(%esp),%esi /* base address of current gdt */ - movl $_gdt-KERNBASE,%edi - movl %edi,2(%esp) - movl $8*18/4,%ecx - cld - rep /* copy gdt */ - movsl - movl $_gdt-KERNBASE,-8+2(%edi) /* adjust gdt self-ptr */ - movb $0x92,-8+5(%edi) - - sidt 6(%esp) - movl 6+2(%esp),%esi /* base address of current idt */ - movl 8+4(%esi),%eax /* convert dbg descriptor to ... */ - movw 8(%esi),%ax - movl %eax,bdb_dbg_ljmp+1-KERNBASE /* ... immediate offset ... */ - movl 8+2(%esi),%eax - movw %ax,bdb_dbg_ljmp+5-KERNBASE /* ... and selector for ljmp */ - movl 24+4(%esi),%eax /* same for bpt descriptor */ - movw 24(%esi),%ax - movl %eax,bdb_bpt_ljmp+1-KERNBASE - movl 24+2(%esi),%eax - movw %ax,bdb_bpt_ljmp+5-KERNBASE - - movl $_idt-KERNBASE,%edi - movl %edi,6+2(%esp) - movl $8*4/4,%ecx - cld - rep /* copy idt */ - movsl +/* Map UPAGES */ + movl R(upa), %eax + movl $UPAGES, %ecx + movl %eax, %ebx + shrl $PGSHIFT-2, %ebx + addl R(_KPTphys), %ebx + orl $PG_V|PG_KW, %eax + fillkpt - lgdt (%esp) - lidt 6(%esp) +/* ... also in user page table page */ + movl R(upa), %eax + movl $UPAGES, %ecx + orl $PG_V|PG_KW, %eax + movl R(p0s), %ebx + addl $(KSTKPTEOFF * PTESIZE), %ebx + fillkpt - addl $2*6,%esp - popal -#endif /* BDE_DEBUGGER */ +/* and a pde entry too */ + movl R(p0s), %eax + movl R(_IdlePTD), %esi + orl $PG_V|PG_KW,%eax + movl %eax,KSTKPTDI*PDESIZE(%esi) + +/* Map ISA hole */ +#define ISA_HOLE_START 0xa0000 +#define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START) + movl $ISA_HOLE_LENGTH>>PGSHIFT, %ecx + movl ISA_HOLE_START, %eax + movl %eax, %ebx + shrl $PGSHIFT-2, %ebx + addl R(_KPTphys), %ebx + orl $PG_V|PG_KW|PG_N, %eax + fillkpt + movl ISA_HOLE_START, %eax + addl $KERNBASE, %eax + movl %eax, R(_atdevbase) + +/* install a pde for temporary double map of bottom of VA */ + movl R(_IdlePTD), %esi + movl R(_KPTphys), %eax + orl $PG_V|PG_KW, %eax + movl %eax, (%esi) + +/* install pde's for pt's */ + movl R(_IdlePTD), %esi + movl R(_KPTphys), %eax + orl $PG_V|PG_KW, %eax + movl $(NKPT), %ecx + lea (KPTDI*PDESIZE)(%esi), %ebx + fillkpt - /* load base of page directory and enable mapping */ - movl %esi,%eax /* phys address of ptd in proc 0 */ - movl %eax,%cr3 /* load ptd addr into mmu */ - movl %cr0,%eax /* get control word */ - orl $CR0_PE|CR0_PG,%eax /* enable paging */ - movl %eax,%cr0 /* and let's page NOW! */ +/* install a pde recursively mapping page directory as a page table */ + movl R(_IdlePTD), %esi + movl %esi,%eax + orl $PG_V|PG_KW,%eax + movl %eax,PTDPTDI*PDESIZE(%esi) - pushl $begin /* jump to high mem */ ret - -begin: /* now running relocated at KERNBASE where the system is linked to run */ - movl _atdevphys,%edx /* get pte PA */ - subl _KPTphys,%edx /* remove base of ptes, now have phys offset */ - shll $PGSHIFT-2,%edx /* corresponding to virt offset */ - addl $KERNBASE,%edx /* add virtual base */ - movl %edx,_atdevbase - - /* set up bootstrap stack */ - movl $_kstack+UPAGES*NBPG,%esp /* bootstrap stack end location */ - xorl %eax,%eax /* mark end of frames */ - movl %eax,%ebp - movl _proc0paddr,%eax - movl %esi,PCB_CR3(%eax) - -#ifdef BDE_DEBUGGER - /* relocate debugger gdt entries */ - - movl $_gdt+8*9,%eax /* adjust slots 9-17 */ - movl $9,%ecx -reloc_gdt: - movb $KERNBASE>>24,7(%eax) /* top byte of base addresses, was 0, */ - addl $8,%eax /* now KERNBASE>>24 */ - loop reloc_gdt - - cmpl $0,_bdb_exists - je 1f - int $3 -1: -#endif /* BDE_DEBUGGER */ - - /* - * Prepare "first" - physical address of first available page - * after the kernel+pdir+upages+p0stack+page tables - */ - lea ((1+UPAGES+1+NKPT)*NBPG)(%esi),%esi - - pushl %esi /* value of first for init386(first) */ - call _init386 /* wire 386 chip for unix operation */ - popl %esi - - .globl __ucodesel,__udatasel - - pushl $0 /* unused */ - pushl __udatasel /* ss */ - pushl $0 /* esp - filled in by execve() */ - pushl $PSL_USER /* eflags (IOPL 0, int enab) */ - pushl __ucodesel /* cs */ - pushl $0 /* eip - filled in by execve() */ - subl $(12*4),%esp /* space for rest of registers */ - - pushl %esp /* call main with frame pointer */ - call _main /* autoconfiguration, mountroot etc */ - - addl $(13*4),%esp /* back to a frame we can return with */ - - /* - * now we've run main() and determined what cpu-type we are, we can - * enable write protection and alignment checking on i486 cpus and - * above. - */ -#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU) - cmpl $CPUCLASS_386,_cpu_class - je 1f - movl %cr0,%eax /* get control word */ - orl $CR0_WP|CR0_AM,%eax /* enable i486 features */ - movl %eax,%cr0 /* and do it */ -#endif - /* - * on return from main(), we are process 1 - * set up address space and stack so that we can 'return' to user mode - */ -1: - movl __ucodesel,%eax - movl __udatasel,%ecx - - movl %cx,%ds - movl %cx,%es - movl %ax,%fs /* double map cs to fs */ - movl %cx,%gs /* and ds to gs */ - iret /* goto user! */ - -#define LCALL(x,y) .byte 0x9a ; .long y ; .word x - -/* - * Signal trampoline, copied to top of user stack - */ -NON_GPROF_ENTRY(sigcode) - call SIGF_HANDLER(%esp) - lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */ - /* copy at 8(%esp)) */ - pushl %eax - pushl %eax /* junk to fake return address */ - movl $SYS_sigreturn,%eax /* sigreturn() */ - LCALL(0x7,0) /* enter kernel with args on stack */ - hlt /* never gets here */ - .align 2,0x90 /* long word text-align */ -_esigcode: - - .data - .globl _szsigcode -_szsigcode: - .long _esigcode-_sigcode diff --git a/sys/amd64/amd64/machdep.c b/sys/amd64/amd64/machdep.c index 4d99fb2..bf14b68 100644 --- a/sys/amd64/amd64/machdep.c +++ b/sys/amd64/amd64/machdep.c @@ -35,7 +35,7 @@ * SUCH DAMAGE. * * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 - * $Id: machdep.c,v 1.182 1996/04/19 07:27:57 phk Exp $ + * $Id: machdep.c,v 1.183 1996/04/25 06:20:10 phk Exp $ */ #include "npx.h" @@ -171,6 +171,7 @@ int _udatasel, _ucodesel; int physmem = 0; +int cold = 1; static int sysctl_hw_physmem SYSCTL_HANDLER_ARGS |