Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files. =================================================================== RCS file: /ftp/cvs/cvsroot/src/sys/arch/i386/i386/locore.S,v rcsdiff: /ftp/cvs/cvsroot/src/sys/arch/i386/i386/locore.S,v: warning: Unknown phrases like `commitid ...;' are present. retrieving revision 1.117 retrieving revision 1.130 diff -u -p -r1.117 -r1.130 --- src/sys/arch/i386/i386/locore.S 2016/05/13 14:03:00 1.117 +++ src/sys/arch/i386/i386/locore.S 2016/06/04 10:19:09 1.130 @@ -1,10 +1,39 @@ -/* $NetBSD: locore.S,v 1.117 2016/05/13 14:03:00 maxv Exp $ */ +/* $NetBSD: locore.S,v 1.130 2016/06/04 10:19:09 maxv Exp $ */ /* * Copyright-o-rama! */ /* + * Copyright (c) 1998, 2000, 2004, 2006, 2007, 2009, 2016 + * The NetBSD Foundation, Inc., All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Charles M. Hannum, by Andrew Doran and by Maxime Villard. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* * Copyright (c) 2006 Manuel Bouyer. * * Redistribution and use in source and binary forms, with or without @@ -65,35 +94,6 @@ */ /*- - * Copyright (c) 1998, 2000, 2004, 2006, 2007, 2009 The NetBSD Foundation, Inc. - * All rights reserved. - * - * This code is derived from software contributed to The NetBSD Foundation - * by Charles M. Hannum, and by Andrew Doran. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS - * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED - * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS - * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - */ - -/*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * @@ -128,7 +128,7 @@ */ #include -__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.117 2016/05/13 14:03:00 maxv Exp $"); +__KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.130 2016/06/04 10:19:09 maxv Exp $"); #include "opt_compat_oldboot.h" #include "opt_copy_symtab.h" @@ -147,13 +147,14 @@ __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1 #include #include -#include #include #include #include #include #include #include +#include + #ifndef XEN #include #endif @@ -168,6 +169,9 @@ __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1 #endif /* XEN */ #define RELOC(x) _RELOC(_C_LABEL(x)) +/* 32bit version of PG_NX */ +#define PG_NX32 0x80000000 + #ifndef PAE #define PROC0_PDIR_OFF 0 #else @@ -188,12 +192,55 @@ __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1 * This is done by the first instruction of fillkpt. In the non-PAE case, this * instruction just clears the page table entry. */ - #define fillkpt \ + cmpl $0,%ecx ; /* zero-sized? */ \ + je 2f ; \ 1: movl $0,(PDE_SIZE-4)(%ebx) ; /* upper 32 bits: 0 */ \ movl %eax,(%ebx) ; /* store phys addr */ \ addl $PDE_SIZE,%ebx ; /* next PTE/PDE */ \ addl $PAGE_SIZE,%eax ; /* next phys page */ \ + loop 1b ; \ +2: ; + +/* + * fillkpt_nox - Same as fillkpt, but sets the NX/XD bit. + */ +#define fillkpt_nox \ + cmpl $0,%ecx ; /* zero-sized? */ \ + je 2f ; \ + pushl %ebp ; \ + movl RELOC(nox_flag),%ebp ; \ +1: movl %ebp,(PDE_SIZE-4)(%ebx) ; /* upper 32 bits: NX */ \ + movl %eax,(%ebx) ; /* store phys addr */ \ + addl $PDE_SIZE,%ebx ; /* next PTE/PDE */ \ + addl $PAGE_SIZE,%eax ; /* next phys page */ \ + loop 1b ; \ + popl %ebp ; \ +2: ; + +/* + * fillkpt_blank - Fill in a kernel page table with blank entries + * ebx = page table address + * ecx = number of pages to map + */ +#define fillkpt_blank \ + cmpl $0,%ecx ; /* zero-sized? */ \ + je 2f ; \ +1: movl $0,(PDE_SIZE-4)(%ebx) ; /* upper 32 bits: 0 */ \ + movl $0,(%ebx) ; /* lower 32 bits: 0 */ \ + addl $PDE_SIZE,%ebx ; /* next PTE/PDE */ \ + loop 1b ; \ +2: ; + +/* + * killkpt - Destroy a kernel page table + * ebx = page table address + * ecx = number of pages to destroy + */ +#define killkpt \ +1: movl $0,(PDE_SIZE-4)(%ebx) ; /* upper bits (for PAE) */ \ + movl $0,(%ebx) ; \ + addl $PDE_SIZE,%ebx ; \ loop 1b ; @@ -223,15 +270,6 @@ __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1 */ .data - .globl _C_LABEL(cputype) - .globl _C_LABEL(cpuid_level) - .globl _C_LABEL(esym) - .globl _C_LABEL(eblob) - .globl _C_LABEL(atdevbase) - .globl _C_LABEL(lwp0uarea) - .globl _C_LABEL(PDPpaddr) - .globl _C_LABEL(gdt) - .globl _C_LABEL(idt) .globl _C_LABEL(lapic_tpr) #if NLAPIC > 0 @@ -240,7 +278,9 @@ __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1 #else .align 12 #endif - .globl _C_LABEL(local_apic), _C_LABEL(lapic_id) + .globl _C_LABEL(local_apic) + .globl _C_LABEL(lapic_id) + .type _C_LABEL(local_apic), @object LABEL(local_apic) .space LAPIC_ID @@ -268,11 +308,30 @@ LABEL(lapic_tpr) .long 0 END(lapic_tpr) #endif + + .globl _C_LABEL(tablesize) + .globl _C_LABEL(nox_flag) + .globl _C_LABEL(cputype) + .globl _C_LABEL(cpuid_level) + .globl _C_LABEL(esym) + .globl _C_LABEL(eblob) + .globl _C_LABEL(atdevbase) + .globl _C_LABEL(PDPpaddr) + .globl _C_LABEL(lwp0uarea) + .globl _C_LABEL(gdt) + .globl _C_LABEL(idt) + + .type _C_LABEL(tablesize), @object +_C_LABEL(tablesize): .long 0 +END(tablesize) + .type _C_LABEL(nox_flag), @object +LABEL(nox_flag) .long 0 /* 32bit NOX flag, set if supported */ +END(nox_flag) .type _C_LABEL(cputype), @object LABEL(cputype) .long 0 /* are we 80486, Pentium, or.. */ END(cputype) .type _C_LABEL(cpuid_level), @object -LABEL(cpuid_level) .long 0 +LABEL(cpuid_level) .long -1 /* max. level accepted by cpuid instr */ END(cpuid_level) .type _C_LABEL(atdevbase), @object LABEL(atdevbase) .long 0 /* location of start of iomem in virt */ @@ -283,9 +342,6 @@ END(lwp0uarea) .type _C_LABEL(PDPpaddr), @object LABEL(PDPpaddr) .long 0 /* paddr of PDP, for libkvm */ END(PDPpaddr) - .type _C_LABEL(tablesize), @object -_C_LABEL(tablesize): .long 0 -END(tablesize) /* Space for the temporary stack */ .size tmpstk, tmpstk - . @@ -360,8 +416,6 @@ _C_LABEL(Multiboot_Header): xorl %eax,%eax movw %ax,%fs movw %ax,%gs - decl %eax - movl %eax,RELOC(cpuid_level) /* Find out our CPU type. */ @@ -523,6 +577,16 @@ try586: /* Use the `cpuid' instruction. cpuid movl %eax,RELOC(cpuid_level) + /* + * Retrieve the NX/XD flag. We use the 32bit version of PG_NX. + */ + movl $0x80000001,%eax + cpuid + andl $CPUID_NOX,%edx + jz no_NOX + movl $PG_NX32,RELOC(nox_flag) +no_NOX: + 2: /* * Finished with old stack; load new %esp now instead of later so we @@ -563,13 +627,16 @@ try586: /* Use the `cpuid' instruction. * +------+--------+------+-----+--------+---------------------+----------- * (1) (2) (3) * - * -------+------------+ - * TABLES | ISA IO MEM | - * -------+------------+ + * -------+-------------+ + * TABLES | ISA I/O MEM | + * -------+-------------+ * (4) * * PROC0 STK is obviously not linked as a page level. It just happens to be * caught between L2 and L1. + * + * Important note: the kernel segments are properly 4k-aligned + * (see kern.ldscript), so there's no need to enforce alignment. */ /* Find end of kernel image; brings us on (1). */ @@ -642,37 +709,55 @@ try586: /* Use the `cpuid' instruction. */ leal (PROC0_PTP1_OFF)(%esi),%ebx - /* Compute &__rodata_start - KERNBASE. */ - movl $RELOC(__rodata_start),%edx - andl $~PGOFSET,%edx - /* Skip the first MB. */ - movl $_RELOC(KERNTEXTOFF),%eax - movl %eax,%ecx - shrl $(PGSHIFT-2),%ecx /* ((n >> PGSHIFT) << 2) for # PDEs */ -#ifdef PAE - shll $1,%ecx /* PDEs are twice larger with PAE */ -#endif - addl %ecx,%ebx + movl $(KERNTEXTOFF - KERNBASE),%ecx + shrl $PGSHIFT,%ecx + fillkpt_blank - /* Map the kernel text read-only. */ - movl %edx,%ecx + /* Map the kernel text RX. */ + movl $(KERNTEXTOFF - KERNBASE),%eax /* start of TEXT */ + movl $RELOC(__rodata_start),%ecx subl %eax,%ecx shrl $PGSHIFT,%ecx orl $(PG_V|PG_KR),%eax fillkpt - /* Map the data, BSS, and bootstrap tables read-write. */ - leal (PG_V|PG_KW)(%edx),%eax - movl RELOC(tablesize),%ecx - addl %esi,%ecx /* end of tables */ - subl %edx,%ecx /* subtract end of text */ + /* Map the kernel rodata R. */ + movl $RELOC(__rodata_start),%eax + movl $RELOC(__data_start),%ecx + subl %eax,%ecx shrl $PGSHIFT,%ecx + orl $(PG_V|PG_KR),%eax + fillkpt_nox + + /* Map the kernel data+bss RW. */ + movl $RELOC(__data_start),%eax + movl $RELOC(__kernel_end),%ecx + subl %eax,%ecx + shrl $PGSHIFT,%ecx + orl $(PG_V|PG_KW),%eax + fillkpt_nox + + /* Map [SYMS]+[PRELOADED MODULES] RWX. */ + movl $RELOC(__kernel_end),%eax + movl %esi,%ecx /* start of BOOTSTRAP TABLES */ + subl %eax,%ecx + shrl $PGSHIFT,%ecx + orl $(PG_V|PG_KW),%eax fillkpt - /* Map ISA I/O mem (later atdevbase) */ - movl $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax - movl $(IOM_SIZE>>PGSHIFT),%ecx + /* Map the BOOTSTRAP TABLES RW. */ + movl %esi,%eax /* start of BOOTSTRAP TABLES */ + movl RELOC(tablesize),%ecx /* length of BOOTSTRAP TABLES */ + shrl $PGSHIFT,%ecx + orl $(PG_V|PG_KW),%eax + fillkpt_nox + + /* We are on (4). Map ISA I/O MEM RWX. */ + movl $IOM_BEGIN,%eax + movl $IOM_SIZE,%ecx /* size of ISA I/O MEM */ + shrl $PGSHIFT,%ecx + orl $(PG_V|PG_KW/*|PG_N*/),%eax fillkpt /* @@ -726,7 +811,20 @@ try586: /* Use the `cpuid' instruction. movl %eax,%cr3 /* - * 2. Enable paging and the rest of it. + * 2. Set NOX in EFER, if available. + */ + movl RELOC(nox_flag),%ebx + cmpl $0,%ebx + je skip_NOX + movl $MSR_EFER,%ecx + rdmsr + xorl %eax,%eax + orl $(EFER_NXE),%eax + wrmsr +skip_NOX: + + /* + * 3. Enable paging and the rest of it. */ movl %cr0,%eax orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax @@ -743,10 +841,7 @@ begin: movl _C_LABEL(nkptp)+1*4,%ecx leal (PROC0_PDIR_OFF)(%esi),%ebx /* old, phys address of PDIR */ addl $(KERNBASE), %ebx /* new, virt address of PDIR */ -1: movl $0,(PDE_SIZE-4)(%ebx) /* upper bits (for PAE) */ - movl $0,(%ebx) - addl $PDE_SIZE,%ebx - loop 1b + killkpt /* Relocate atdevbase. */ movl $KERNBASE,%edx