| locore.s (592) | locore.s (608) |
|---|---|
| 1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without --- 20 unchanged lines hidden (view full) --- 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)locore.s 7.3 (Berkeley) 5/13/91 | 1/*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without --- 20 unchanged lines hidden (view full) --- 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)locore.s 7.3 (Berkeley) 5/13/91 |
| 37 * $Id: locore.s,v 1.6 1993/10/10 06:07:57 rgrimes Exp $ | 37 * $Id: locore.s,v 1.7 1993/10/13 07:11:11 rgrimes Exp $ |
| 38 */ 39 40 41/* 42 * locore.s: 4BSD machine support for the Intel 386 43 * Preliminary version 44 * Written by William F. Jolitz, 386BSD Project 45 */ --- 70 unchanged lines hidden (view full) --- 116 117/* 118 * PTmap is recursive pagemap at top of virtual address space. 119 * Within PTmap, the page directory can be found (third indirection). 120 */ 121 .globl _PTmap,_PTD,_PTDpde,_Sysmap 122 .set _PTmap,PTDPTDI << PDRSHIFT 123 .set _PTD,_PTmap + (PTDPTDI * NBPG) | 38 */ 39 40 41/* 42 * locore.s: 4BSD machine support for the Intel 386 43 * Preliminary version 44 * Written by William F. Jolitz, 386BSD Project 45 */ --- 70 unchanged lines hidden (view full) --- 116 117/* 118 * PTmap is recursive pagemap at top of virtual address space. 119 * Within PTmap, the page directory can be found (third indirection). 120 */ 121 .globl _PTmap,_PTD,_PTDpde,_Sysmap 122 .set _PTmap,PTDPTDI << PDRSHIFT 123 .set _PTD,_PTmap + (PTDPTDI * NBPG) |
| 124 .set _PTDpde,_PTD + (PTDPTDI * 4) /* XXX 4=sizeof pte */ | 124 .set _PTDpde,_PTD + (PTDPTDI * 4) /* XXX 4=sizeof pde */ |
| 125 | 125 |
| 126 .set _Sysmap,0xFDFF8000 | 126 .set _Sysmap,_PTmap + (KPTDI * NBPG) |
| 127 128/* 129 * APTmap, APTD is the alternate recursive pagemap. 130 * It's used when modifying another process's page tables. 131 */ 132 .globl _APTmap,_APTD,_APTDpde 133 .set _APTmap,APTDPTDI << PDRSHIFT 134 .set _APTD,_APTmap + (APTDPTDI * NBPG) | 127 128/* 129 * APTmap, APTD is the alternate recursive pagemap. 130 * It's used when modifying another process's page tables. 131 */ 132 .globl _APTmap,_APTD,_APTDpde 133 .set _APTmap,APTDPTDI << PDRSHIFT 134 .set _APTD,_APTmap + (APTDPTDI * NBPG) |
| 135 .set _APTDpde,_PTD + (APTDPTDI * 4) /* XXX 4=sizeof pte */ | 135 .set _APTDpde,_PTD + (APTDPTDI * 4) /* XXX 4=sizeof pde */ |
| 136 137/* 138 * Access to each processes kernel stack is via a region of 139 * per-process address space (at the beginning), immediatly above 140 * the user process stack. 141 */ 142 .set _kstack,USRSTACK 143 .globl _kstack --- 91 unchanged lines hidden (view full) --- 235 * program should check: 236 * text+data <= &stack_variable - more_space_for_stack 237 * text+data+bss+pad+space_for_page_tables <= end_of_memory 238 * Oops, the gdt is in the carcass of the boot program so clearing 239 * the rest of memory is still not possible. 240 */ 241 movl $tmpstk-KERNBASE,%esp /* bootstrap stack end location */ 242 | 136 137/* 138 * Access to each processes kernel stack is via a region of 139 * per-process address space (at the beginning), immediatly above 140 * the user process stack. 141 */ 142 .set _kstack,USRSTACK 143 .globl _kstack --- 91 unchanged lines hidden (view full) --- 235 * program should check: 236 * text+data <= &stack_variable - more_space_for_stack 237 * text+data+bss+pad+space_for_page_tables <= end_of_memory 238 * Oops, the gdt is in the carcass of the boot program so clearing 239 * the rest of memory is still not possible. 240 */ 241 movl $tmpstk-KERNBASE,%esp /* bootstrap stack end location */ 242 |
| 243#ifdef garbage 244 /* count up memory */ 245 246 xorl %eax,%eax /* start with base memory at 0x0 */ 247 #movl $0xA0000/NBPG,%ecx /* look every 4K up to 640K */ 248 movl $0xA0,%ecx /* look every 4K up to 640K */ 2491: movl (%eax),%ebx /* save location to check */ 250 movl $0xa55a5aa5,(%eax) /* write test pattern */ 251 /* flush stupid cache here! (with bcopy(0,0,512*1024) ) */ 252 cmpl $0xa55a5aa5,(%eax) /* does not check yet for rollover */ 253 jne 2f 254 movl %ebx,(%eax) /* restore memory */ 255 addl $NBPG,%eax 256 loop 1b 2572: shrl $12,%eax 258 movl %eax,_Maxmem-KERNBASE 259 260 movl $0x100000,%eax /* next, talley remaining memory */ 261 #movl $((0xFFF000-0x100000)/NBPG),%ecx 262 movl $(0xFFF-0x100),%ecx 2631: movl (%eax),%ebx /* save location to check */ 264 movl $0xa55a5aa5,(%eax) /* write test pattern */ 265 cmpl $0xa55a5aa5,(%eax) /* does not check yet for rollover */ 266 jne 2f 267 movl %ebx,(%eax) /* restore memory */ 268 addl $NBPG,%eax 269 loop 1b 2702: shrl $12,%eax 271 movl %eax,_Maxmem-KERNBASE 272#endif 273 | |
| 274/* 275 * Virtual address space of kernel: 276 * 277 * text | data | bss | [syms] | page dir | proc0 kernel stack | usr stk map | Sysmap 278 * 0 1 2 3 4 279 */ 280 281/* find end of kernel image */ --- 7 unchanged lines hidden (view full) --- 289 subl %edi,%ecx 290 addl $(UPAGES+5)*NBPG,%ecx /* size of tables */ 291 292 xorl %eax,%eax /* pattern */ 293 cld 294 rep 295 stosb 296 | 243/* 244 * Virtual address space of kernel: 245 * 246 * text | data | bss | [syms] | page dir | proc0 kernel stack | usr stk map | Sysmap 247 * 0 1 2 3 4 248 */ 249 250/* find end of kernel image */ --- 7 unchanged lines hidden (view full) --- 258 subl %edi,%ecx 259 addl $(UPAGES+5)*NBPG,%ecx /* size of tables */ 260 261 xorl %eax,%eax /* pattern */ 262 cld 263 rep 264 stosb 265 |
| 266/* 267 * If we are loaded at 0x0 check to see if we have space for the 268 * page tables pages after the kernel and before the 640K ISA memory 269 * hole. If we do not have space relocate the page table pages and 270 * the kernel stack to start at 1MB. The value that ends up in esi 271 * is used by the rest of locore to build the tables. Locore adjusts 272 * esi each time it allocates a structure and then passes the final 273 * value to init386(first) as the value first. esi should ALWAYS 274 * be page aligned!! 275 */ 276 movl %esi,%ecx /* Get current first availiable address */ 277 cmpl $0x100000,%ecx /* Lets see if we are already above 1MB */ 278 jge 1f /* yep, don't need to check for room */ 279 addl $(NKPDE + 4) * NBPG,%ecx /* XXX the 4 is for kstack */ 280 /* space for kstack, PTD and PTE's */ 281 cmpl $(640*1024),%ecx 282 /* see if it fits in low memory */ 283 jle 1f /* yep, don't need to relocate it */ 284 movl $0x100000,%esi /* won't fit, so start it at 1MB */ 2851: 286 |
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| 297/* physical address of Idle Address space */ 298 movl %esi,_IdlePTD-KERNBASE 299 300/* 301 * fillkpt 302 * eax = (page frame address | control | status) == pte 303 * ebx = address of page table 304 * ecx = how many pages to map --- 146 unchanged lines hidden (view full) --- 451 452 /* set up bootstrap stack */ 453 movl $_kstack+UPAGES*NBPG-4*12,%esp /* bootstrap stack end location */ 454 xorl %eax,%eax /* mark end of frames */ 455 movl %eax,%ebp 456 movl _proc0paddr,%eax 457 movl %esi,PCB_CR3(%eax) 458 | 287/* physical address of Idle Address space */ 288 movl %esi,_IdlePTD-KERNBASE 289 290/* 291 * fillkpt 292 * eax = (page frame address | control | status) == pte 293 * ebx = address of page table 294 * ecx = how many pages to map --- 146 unchanged lines hidden (view full) --- 441 442 /* set up bootstrap stack */ 443 movl $_kstack+UPAGES*NBPG-4*12,%esp /* bootstrap stack end location */ 444 xorl %eax,%eax /* mark end of frames */ 445 movl %eax,%ebp 446 movl _proc0paddr,%eax 447 movl %esi,PCB_CR3(%eax) 448 |
| 459 lea 7*NBPG(%esi),%esi /* skip past stack. */ 460 pushl %esi 461 | |
| 462 /* relocate debugger gdt entries */ 463 464 movl $_gdt+8*9,%eax /* adjust slots 9-17 */ 465 movl $9,%ecx 466reloc_gdt: 467 movb $0xfe,7(%eax) /* top byte of base addresses, was 0, */ 468 addl $8,%eax /* now KERNBASE>>24 */ 469 loop reloc_gdt 470 471 cmpl $0,_bdb_exists 472 je 1f 473 int $3 4741: 475 | 449 /* relocate debugger gdt entries */ 450 451 movl $_gdt+8*9,%eax /* adjust slots 9-17 */ 452 movl $9,%ecx 453reloc_gdt: 454 movb $0xfe,7(%eax) /* top byte of base addresses, was 0, */ 455 addl $8,%eax /* now KERNBASE>>24 */ 456 loop reloc_gdt 457 458 cmpl $0,_bdb_exists 459 je 1f 460 int $3 4611: 462 |
| 463 /* 464 * Skip over the page tables and the kernel stack 465 * XXX 4 is kstack size 466 */ 467 lea (NKPDE + 4) * NBPG(%esi),%esi 468 469 pushl %esi /* value of first for init386(first) */ |
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| 476 call _init386 /* wire 386 chip for unix operation */ 477 478 movl $0,_PTD 479 call _main /* autoconfiguration, mountroot etc */ 480 popl %esi 481 482 /* 483 * now we've run main() and determined what cpu-type we are, we can --- 1174 unchanged lines hidden (view full) --- 1658 movl (%esp),%eax /* Hardware registers */ 1659 movl %eax,PCB_EIP(%ecx) 1660 movl %ebx,PCB_EBX(%ecx) 1661 movl %esp,PCB_ESP(%ecx) 1662 movl %ebp,PCB_EBP(%ecx) 1663 movl %esi,PCB_ESI(%ecx) 1664 movl %edi,PCB_EDI(%ecx) 1665 | 470 call _init386 /* wire 386 chip for unix operation */ 471 472 movl $0,_PTD 473 call _main /* autoconfiguration, mountroot etc */ 474 popl %esi 475 476 /* 477 * now we've run main() and determined what cpu-type we are, we can --- 1174 unchanged lines hidden (view full) --- 1652 movl (%esp),%eax /* Hardware registers */ 1653 movl %eax,PCB_EIP(%ecx) 1654 movl %ebx,PCB_EBX(%ecx) 1655 movl %esp,PCB_ESP(%ecx) 1656 movl %ebp,PCB_EBP(%ecx) 1657 movl %esi,PCB_ESI(%ecx) 1658 movl %edi,PCB_EDI(%ecx) 1659 |
| 1666#ifdef NPX | 1660#if NNPX > 0 |
| 1667 /* have we used fp, and need a save? */ 1668 mov _curproc,%eax 1669 cmp %eax,_npxproc 1670 jne 1f 1671 pushl %ecx /* h/w bugs make saving complicated */ 1672 leal PCB_SAVEFPU(%ecx),%eax 1673 pushl %eax 1674 call _npxsave /* do it in a big C function */ 1675 popl %eax 1676 popl %ecx 16771: | 1661 /* have we used fp, and need a save? */ 1662 mov _curproc,%eax 1663 cmp %eax,_npxproc 1664 jne 1f 1665 pushl %ecx /* h/w bugs make saving complicated */ 1666 leal PCB_SAVEFPU(%ecx),%eax 1667 pushl %eax 1668 call _npxsave /* do it in a big C function */ 1669 popl %eax 1670 popl %ecx 16711: |
| 1678#endif | 1672#endif /* NNPX > 0 */ |
| 1679 1680 movl _CMAP2,%eax /* save temporary map PTE */ 1681 movl %eax,PCB_CMAP2(%ecx) /* in our context */ 1682 movl $0,_curproc /* out of process */ 1683 1684# movw _cpl,%ax 1685# movw %ax,PCB_IML(%ecx) /* save ipl */ 1686 --- 118 unchanged lines hidden (view full) --- 1805 movl (%esp),%eax 1806 movl %eax,PCB_EIP(%ecx) 1807 movl %ebx,PCB_EBX(%ecx) 1808 movl %esp,PCB_ESP(%ecx) 1809 movl %ebp,PCB_EBP(%ecx) 1810 movl %esi,PCB_ESI(%ecx) 1811 movl %edi,PCB_EDI(%ecx) 1812 | 1673 1674 movl _CMAP2,%eax /* save temporary map PTE */ 1675 movl %eax,PCB_CMAP2(%ecx) /* in our context */ 1676 movl $0,_curproc /* out of process */ 1677 1678# movw _cpl,%ax 1679# movw %ax,PCB_IML(%ecx) /* save ipl */ 1680 --- 118 unchanged lines hidden (view full) --- 1799 movl (%esp),%eax 1800 movl %eax,PCB_EIP(%ecx) 1801 movl %ebx,PCB_EBX(%ecx) 1802 movl %esp,PCB_ESP(%ecx) 1803 movl %ebp,PCB_EBP(%ecx) 1804 movl %esi,PCB_ESI(%ecx) 1805 movl %edi,PCB_EDI(%ecx) 1806 |
| 1813#ifdef NPX | 1807#if NNPX > 0 |
| 1814 /* 1815 * If npxproc == NULL, then the npx h/w state is irrelevant and the 1816 * state had better already be in the pcb. This is true for forks 1817 * but not for dumps (the old book-keeping with FP flags in the pcb 1818 * always lost for dumps because the dump pcb has 0 flags). 1819 * 1820 * If npxproc != NULL, then we have to save the npx h/w state to 1821 * npxproc's pcb and copy it to the requested pcb, or save to the --- 19 unchanged lines hidden (view full) --- 1841 pushl $108+8*2 /* XXX h/w state size + padding */ 1842 leal PCB_SAVEFPU(%ecx),%ecx 1843 pushl %ecx 1844 pushl %eax 1845 call _bcopy 1846 addl $12,%esp 1847 popl %ecx 18481: | 1808 /* 1809 * If npxproc == NULL, then the npx h/w state is irrelevant and the 1810 * state had better already be in the pcb. This is true for forks 1811 * but not for dumps (the old book-keeping with FP flags in the pcb 1812 * always lost for dumps because the dump pcb has 0 flags). 1813 * 1814 * If npxproc != NULL, then we have to save the npx h/w state to 1815 * npxproc's pcb and copy it to the requested pcb, or save to the --- 19 unchanged lines hidden (view full) --- 1835 pushl $108+8*2 /* XXX h/w state size + padding */ 1836 leal PCB_SAVEFPU(%ecx),%ecx 1837 pushl %ecx 1838 pushl %eax 1839 call _bcopy 1840 addl $12,%esp 1841 popl %ecx 18421: |
| 1849#endif | 1843#endif /* NNPX > 0 */ |
| 1850 1851 movl _CMAP2,%edx /* save temporary map PTE */ 1852 movl %edx,PCB_CMAP2(%ecx) /* in our context */ 1853 1854 cmpl $0,8(%esp) 1855 je 1f 1856 movl %esp,%edx /* relocate current sp relative to pcb */ 1857 subl $_kstack,%edx /* (sp is relative to kstack): */ --- 112 unchanged lines hidden (view full) --- 1970 TRAP(T_STKFLT) 1971IDTVEC(prot) 1972 TRAP(T_PROTFLT) 1973IDTVEC(page) 1974 TRAP(T_PAGEFLT) 1975IDTVEC(rsvd) 1976 pushl $0; TRAP(T_RESERVED) 1977IDTVEC(fpu) | 1844 1845 movl _CMAP2,%edx /* save temporary map PTE */ 1846 movl %edx,PCB_CMAP2(%ecx) /* in our context */ 1847 1848 cmpl $0,8(%esp) 1849 je 1f 1850 movl %esp,%edx /* relocate current sp relative to pcb */ 1851 subl $_kstack,%edx /* (sp is relative to kstack): */ --- 112 unchanged lines hidden (view full) --- 1964 TRAP(T_STKFLT) 1965IDTVEC(prot) 1966 TRAP(T_PROTFLT) 1967IDTVEC(page) 1968 TRAP(T_PAGEFLT) 1969IDTVEC(rsvd) 1970 pushl $0; TRAP(T_RESERVED) 1971IDTVEC(fpu) |
| 1978#ifdef NPX | 1972#if NNPX > 0 |
| 1979 /* 1980 * Handle like an interrupt so that we can call npxintr to clear the 1981 * error. It would be better to handle npx interrupts as traps but 1982 * this is difficult for nested interrupts. 1983 */ 1984 pushl $0 /* dummy error code */ 1985 pushl $T_ASTFLT 1986 pushal --- 5 unchanged lines hidden (view full) --- 1992 movl $KDSEL,%eax 1993 movl %ax,%ds 1994 movl %ax,%es 1995 pushl _cpl 1996 pushl $0 /* dummy unit to finish building intr frame */ 1997 incl _cnt+V_TRAP 1998 call _npxintr 1999 jmp doreti | 1973 /* 1974 * Handle like an interrupt so that we can call npxintr to clear the 1975 * error. It would be better to handle npx interrupts as traps but 1976 * this is difficult for nested interrupts. 1977 */ 1978 pushl $0 /* dummy error code */ 1979 pushl $T_ASTFLT 1980 pushal --- 5 unchanged lines hidden (view full) --- 1986 movl $KDSEL,%eax 1987 movl %ax,%ds 1988 movl %ax,%es 1989 pushl _cpl 1990 pushl $0 /* dummy unit to finish building intr frame */ 1991 incl _cnt+V_TRAP 1992 call _npxintr 1993 jmp doreti |
| 2000#else | 1994#else /* NNPX > 0 */ |
| 2001 pushl $0; TRAP(T_ARITHTRAP) | 1995 pushl $0; TRAP(T_ARITHTRAP) |
| 2002#endif | 1996#endif /* NNPX > 0 */ |
| 2003 /* 17 - 31 reserved for future exp */ 2004IDTVEC(rsvd0) 2005 pushl $0; TRAP(17) 2006IDTVEC(rsvd1) 2007 pushl $0; TRAP(18) 2008IDTVEC(rsvd2) 2009 pushl $0; TRAP(19) 2010IDTVEC(rsvd3) --- 148 unchanged lines hidden --- | 1997 /* 17 - 31 reserved for future exp */ 1998IDTVEC(rsvd0) 1999 pushl $0; TRAP(17) 2000IDTVEC(rsvd1) 2001 pushl $0; TRAP(18) 2002IDTVEC(rsvd2) 2003 pushl $0; TRAP(19) 2004IDTVEC(rsvd3) --- 148 unchanged lines hidden --- |